mjsonrpc.cxx

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/********************************************************************\
 
  Name:         mjsonrpc.cxx
  Created by:   Konstantin Olchanski
 
  Contents:     handler of MIDAS standard JSON-RPC requests
 
\********************************************************************/
 
#undef NDEBUG // midas required assert() to be always enabled
 
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <map>
 
#include "mjson.h"
#include "midas.h"
#include "msystem.h"
#include "mstrlcpy.h"
 
#include "mjsonrpc.h"
 
#include <mutex> // std::mutex
 
//
// Specifications for JSON-RPC
//
// https://tools.ietf.org/html/rfc4627 - JSON RFC
// http://www.jsonrpc.org/specification - specification of JSON-RPC 2.0
// http://www.simple-is-better.org/json-rpc/transport_http.html
//
// NB - MIDAS JSON (odb.c and mjson.cxx) encode IEEE754/854 numeric values
//      NaN and +/-Inf into JSON strings "NaN", "Infinity" and "-Infinity"
//      for reasons unknown, the JSON standard does not specify a standard
//      way for encoding these numeric values.
//
// NB - Batch requests are processed in order and the returned array of responses
//      has the resonses in exactly same order as the requests for simpler
//      matching of requests and responses - 1st response to 1st request,
//      2nd response to 2nd request and so forth.
//
//
// JSON-RPC error codes:
//
// -32700   Parse error Invalid JSON was received by the server. An error occurred on the server while parsing the JSON text.
// -32600   Invalid Request   The JSON sent is not a valid Request object.
// -32601   Method not found  The method does not exist / is not available.
// -32602   Invalid params Invalid method parameter(s).
// -32603   Internal error Internal JSON-RPC error.
// -32000 to -32099  Server error   Reserved for implementation-defined server-errors.
//
// Typical JSON-RPC request:
//
// {
//    "jsonrpc": "2.0",
//    "method": "sum",
//    "params": { "b": 34, "c": 56, "a": 12 },
//    "id": 123
// }
//
// Typical JSON-RPC reply:
//
// {
//    "jsonrpc": "2.0",
//    "result": 102,
//    "id": 5
// }
//
// Typical error reply:
//
// {
//    "jsonrpc": "2.0",
//    "error": {
//        "code": -32600,
//        "message": "Invalid Request.",
//        "data": "'method' is missing"
//        },
//    "id": 6
//    }
// }
//
//
// JSON-RPC is documented via an automatically generated JSON Schema.
//
// For more information about JSON Schemas, see:
//
// https://tools.ietf.org/html/draft-zyp-json-schema-04
// http://spacetelescope.github.io/understanding-json-schema/
// http://json-schema.org/
//
// JSON Schema examples:
// http://json-schema.org/examples.html
// http://json-schema.org/example1.html
//
// JSON Schema visualization: (schema file has to have a .json extension)
// https://github.com/lbovet/docson
//
// Non-standard proposed JSON-RPC schema is *NOT* used: (no visualization tools)
// http://www.simple-is-better.org/json-rpc/jsonrpc20-schema-service-descriptor.html
//
// Variances of MIDAS JSON-RPC Schema from standard:
//
// - optional parameters end with "?" and have an "optional:true" attribute, i.e. "bUnique?"
// - array parameters end with "[]", JSON Schema array schema is not generated yet
//
 
int mjsonrpc_debug = 0; // in mjsonrpc.h
static int mjsonrpc_sleep = 0;
static int mjsonrpc_time = 0;
 
static double GetTimeSec()
{
   struct timeval tv;
   gettimeofday(&tv, NULL);
   return tv.tv_sec*1.0 + tv.tv_usec/1000000.0;
}
 
MJsonNode* mjsonrpc_make_error(int code, const char* message, const char* data)
{
   MJsonNode* errnode = MJsonNode::MakeObject();
   errnode->AddToObject("code",    MJsonNode::MakeInt(code));
   errnode->AddToObject("message", MJsonNode::MakeString(message));
   errnode->AddToObject("data",    MJsonNode::MakeString(data));
 
   MJsonNode* result = MJsonNode::MakeObject();
   result->AddToObject("error", errnode);
   return result;
}
 
MJsonNode* mjsonrpc_make_result(MJsonNode* node)
{
   MJsonNode* result = MJsonNode::MakeObject();
   result->AddToObject("result", node);
   return result;
}
 
MJsonNode* mjsonrpc_make_result(const char* name, MJsonNode* value, const char* name2, MJsonNode* value2, const char* name3, MJsonNode* value3)
{
   MJsonNode* node = MJsonNode::MakeObject();
 
   if (name)
      node->AddToObject(name, value);
   if (name2)
      node->AddToObject(name2, value2);
   if (name3)
      node->AddToObject(name3, value3);
 
   MJsonNode* result = MJsonNode::MakeObject();
   result->AddToObject("result", node);
   return result;
}
 
MJsonNode* mjsonrpc_make_result(const char* name, MJsonNode* value, const char* name2, MJsonNode* value2, const char* name3, MJsonNode* value3, const char* name4, MJsonNode* value4)
{
   MJsonNode* node = MJsonNode::MakeObject();
 
   if (name)
      node->AddToObject(name, value);
   if (name2)
      node->AddToObject(name2, value2);
   if (name3)
      node->AddToObject(name3, value3);
   if (name4)
      node->AddToObject(name4, value4);
 
   MJsonNode* result = MJsonNode::MakeObject();
   result->AddToObject("result", node);
   return result;
}
 
static MJsonNode* gNullNode = NULL;
 
const MJsonNode* mjsonrpc_get_param(const MJsonNode* params, const char* name, MJsonNode** error)
{
   assert(gNullNode != NULL);
 
   // NULL params is a request for documentation, return an empty object
   if (!params) {
      if (error)
         *error = MJsonNode::MakeObject();
      return gNullNode;
   }
 
   const MJsonNode* obj = params->FindObjectNode(name);
   if (!obj) {
      if (error)
         *error = mjsonrpc_make_error(-32602, "Invalid params", (std::string("missing parameter: ") + name).c_str());
      return gNullNode;
   }
 
   if (error)
      *error = NULL;
   return obj;
}
 
const MJsonNodeVector* mjsonrpc_get_param_array(const MJsonNode* params, const char* name, MJsonNode** error)
{
   // NULL params is a request for documentation, return NULL
   if (!params) {
      if (error)
         *error = MJsonNode::MakeObject();
      return NULL;
   }
 
   const MJsonNode* node = mjsonrpc_get_param(params, name, error);
 
   // handle error return from mjsonrpc_get_param()
   if (error && *error) {
      return NULL;
   }
 
   const MJsonNodeVector* v = node->GetArray();
 
   if (!v) {
      if (error)
         *error = mjsonrpc_make_error(-32602, "Invalid params", (std::string("parameter must be an array: ") + name).c_str());
      return NULL;
   }
 
   if (error)
      *error = NULL;
   return v;
}
 
MJSO* MJSO::MakeObjectSchema(const char* description) // constructor for object schema
{
   MJSO* p = new MJSO();
   if (description)
      p->AddToObject("description", MJsonNode::MakeString(description));
   p->AddToObject("type", MJsonNode::MakeString("object"));
   p->properties = MJsonNode::MakeObject();
   p->required = MJsonNode::MakeArray();
   p->AddToObject("properties", p->properties);
   p->AddToObject("required", p->required);
   return p;
}
 
MJSO* MJSO::MakeArraySchema(const char* description) // constructor for array schema
{
   MJSO* p = new MJSO();
   p->AddToObject("description", MJsonNode::MakeString(description));
   p->AddToObject("type", MJsonNode::MakeString("array"));
   p->items = MJsonNode::MakeArray();
   p->AddToObject("items", p->items);
   return p;
}
 
static std::string remove(const std::string s, char c)
{
   std::string::size_type pos = s.find(c);
   if (pos == std::string::npos)
      return s;
   else
      return s.substr(0, pos);
}
 
void MJSO::AddToSchema(MJsonNode* s, const char* xname)
{
   if (!xname)
      xname = "";
 
   bool optional = strchr(xname, '?');
   bool array = strchr(xname, '[');
 
   // remove the "?" and "[]" marker characters
   std::string name = xname;
   name = remove(name, '?');
   name = remove(name, '[');
   name = remove(name, ']');
 
   if (optional)
      s->AddToObject("optional", MJsonNode::MakeBool(true));
 
   if (array) { // insert an array schema
      MJSO* ss = MakeArraySchema(s->FindObjectNode("description")->GetString().c_str());
      s->DeleteObjectNode("description");
      ss->AddToSchema(s, "");
      s = ss;
   }
 
   if (items)
      items->AddToArray(s);
   else {
      assert(properties);
      assert(required);
      properties->AddToObject(name.c_str(), s);
      if (!optional) {
         required->AddToArray(MJsonNode::MakeString(name.c_str()));
      }
   }
}
 
MJSO* MJSO::I()
{
   return MakeObjectSchema(NULL);
}
 
void MJSO::D(const char* description)
{
   this->AddToObject("description", MJsonNode::MakeString(description));
}
 
MJSO* MJSO::Params()
{
   if (!params) {
      params = MakeObjectSchema(NULL);
      this->AddToSchema(params, "params");
   }
   return params;
}
 
MJSO* MJSO::Result()
{
   if (!result) {
      result = MakeObjectSchema(NULL);
      this->AddToSchema(result, "result");
   }
   return result;
}
 
MJSO* MJSO::PA(const char* description)
{
   MJSO* s = MakeArraySchema(description);
   this->AddToSchema(s, "params");
   return s;
}
 
MJSO* MJSO::RA(const char* description)
{
   MJSO* s = MakeArraySchema(description);
   this->AddToSchema(s, "result");
   return s;
}
 
void MJSO::P(const char* name, int mjson_type, const char* description)
{
   if (name == NULL)
      this->Add("params", mjson_type, description);
   else
      Params()->Add(name, mjson_type, description);
}
 
void MJSO::R(const char* name, int mjson_type, const char* description)
{
   if (name == NULL)
      this->Add("result", mjson_type, description);
   else
      Result()->Add(name, mjson_type, description);
}
 
void MJSO::Add(const char* name, int mjson_type, const char* description)
{
   MJsonNode* p = MJsonNode::MakeObject();
   p->AddToObject("description", MJsonNode::MakeString(description));
   if (mjson_type == MJSON_ARRAY)
      p->AddToObject("type", MJsonNode::MakeString("array"));
   else if (mjson_type == MJSON_OBJECT)
      p->AddToObject("type", MJsonNode::MakeString("object"));
   else if (mjson_type == MJSON_STRING)
      p->AddToObject("type", MJsonNode::MakeString("string"));
   else if (mjson_type == MJSON_INT)
      p->AddToObject("type", MJsonNode::MakeString("integer"));
   else if (mjson_type == MJSON_NUMBER)
      p->AddToObject("type", MJsonNode::MakeString("number"));
   else if (mjson_type == MJSON_BOOL)
      p->AddToObject("type", MJsonNode::MakeString("bool"));
   else if (mjson_type == MJSON_NULL)
      p->AddToObject("type", MJsonNode::MakeString("null"));
   else if (mjson_type == MJSON_ARRAYBUFFER)
      p->AddToObject("type", MJsonNode::MakeString("arraybuffer"));
   else if (mjson_type == MJSON_JSON)
      p->AddToObject("type", MJsonNode::MakeString("json"));
   else if (mjson_type == 0)
      ;
   else
      assert(!"invalid value of mjson_type");
   this->AddToSchema(p, name);
}
 
MJSO* MJSO::AddObject(const char* name, const char* description)
{
   MJSO* s = MakeObjectSchema(description);
   s->AddToObject("description", MJsonNode::MakeString(description));
   s->AddToObject("type", MJsonNode::MakeString("object"));
   this->AddToSchema(s, name);
   return s;
}
 
MJSO* MJSO::AddArray(const char* name, const char* description)
{
   MJSO* s = MakeArraySchema(description);
   s->AddToObject("description", MJsonNode::MakeString(description));
   s->AddToObject("type", MJsonNode::MakeString("array"));
   this->AddToSchema(s, name);
   return s;
}
 
MJSO::MJSO() // ctor
   : MJsonNode(MJSON_OBJECT)
{
   properties = NULL;
   required = NULL;
   items = NULL;
   params = NULL;
   result = NULL;
}
 
static MJsonNode* xnull(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("RPC method always returns null");
      doc->P(NULL, 0, "method parameters are ignored");
      doc->R(NULL, MJSON_NULL, "always returns null");
      return doc;
   }
 
   return mjsonrpc_make_result(MJsonNode::MakeNull());
}
 
//
// Programs start/stop code goes here
//
 
static MJsonNode* js_cm_exist(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("calls MIDAS cm_exist() to check if given MIDAS program is running");
      doc->P("name", MJSON_STRING, "name of the program, corresponding to ODB /Programs/name");
      doc->P("unique?", MJSON_BOOL, "bUnique argument to cm_exist()");
      doc->R("status", MJSON_INT, "return status of cm_exist()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string name = mjsonrpc_get_param(params, "name", &error)->GetString();
   if (error)
      return error;
 
   int unique = mjsonrpc_get_param(params, "unique", NULL)->GetBool();
 
   int status = cm_exist(name.c_str(), unique);
 
   if (mjsonrpc_debug)
      printf("cm_exist(%s,%d) -> %d\n", name.c_str(), unique, status);
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
static MJsonNode* js_cm_shutdown(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("calls MIDAS cm_shutdown() to stop given MIDAS program");
      doc->P("name", MJSON_STRING, "name of the program, corresponding to ODB /Programs/name");
      doc->P("unique?", MJSON_BOOL, "bUnique argument to cm_shutdown()");
      doc->R("status", MJSON_INT, "return status of cm_shutdown()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string name = mjsonrpc_get_param(params, "name", &error)->GetString();
   if (error)
      return error;
 
   int unique = mjsonrpc_get_param(params, "unique", NULL)->GetBool();
 
   int status = cm_shutdown(name.c_str(), unique);
 
   if (mjsonrpc_debug)
      printf("cm_shutdown(%s,%d) -> %d\n", name.c_str(), unique, status);
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
static MJsonNode* start_program(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("start MIDAS program defined in ODB /Programs/name");
      doc->P("name", MJSON_STRING, "name of the program, corresponding to ODB /Programs/name");
      doc->R("status", MJSON_INT, "return status of ss_system()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string name = mjsonrpc_get_param(params, "name", &error)->GetString(); if (error) return error;
 
   std::string path = "";
   path += "/Programs/";
   path += name;
   path += "/Start command";
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   char command[256];
   int size = sizeof(command);
   int status = db_get_value(hDB, 0, path.c_str(), command, &size, TID_STRING, FALSE);
 
   if (status == DB_SUCCESS && command[0]) {
      status = ss_system(command);
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
static MJsonNode* exec_script(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("execute custom script defined in ODB /Script (scripts show in the menu) or /CustomScript (scripts from custom pages)");
      doc->P("script?", MJSON_STRING, "Execute ODB /Script/xxx");
      doc->P("customscript?", MJSON_STRING, "Execute ODB /CustomScript/xxx");
      doc->R("status", MJSON_INT, "return status of cm_exec_script()");
      return doc;
   }
 
   std::string script = mjsonrpc_get_param(params, "script", NULL)->GetString();
   std::string customscript = mjsonrpc_get_param(params, "customscript", NULL)->GetString();
 
   std::string path;
   
   if (script.length() > 0) {
      path += "/Script";
      path += "/";
      path += script;
   } else if (customscript.length() > 0) {
      path += "/CustomScript";
      path += "/";
      path += customscript;
   }
 
   int status = 0;
 
   if (path.length() > 0) {
      status = cm_exec_script(path.c_str());
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
//
// ODB code goes here
//
 
static int parse_array_index_list(const char* method, const char* path, std::vector<unsigned> *list)
{
   // parse array index in form of:
   // odbpath[number]
   // odbpath[number,number]
   // odbpath[number-number]
   // or any combination of them, i.e. odbpath[1,10-15,20,30-40]
 
   const char*s = strchr(path, '[');
 
   if (!s) {
      cm_msg(MERROR, method, "expected an array index character \'[\' in \"%s\"", path);
      return DB_OUT_OF_RANGE;
   }
  
   s++; // skip '[' itself
 
   while (s && (*s != 0)) {
 
      // check that we have a number
      if (!isdigit(*s)) {
         cm_msg(MERROR, method, "expected a number in array index in \"%s\" at \"%s\"", path, s);
         return DB_OUT_OF_RANGE;
      }
 
      unsigned value1 = strtoul(s, (char**)&s, 10);
      
      // array range, 
      if (*s == '-') {
         s++; // skip the minus char
 
         if (!isdigit(*s)) {
            cm_msg(MERROR, method, "expected a number in array index in \"%s\" at \"%s\"", path, s);
            return DB_OUT_OF_RANGE;
         }
 
         unsigned value2 = strtoul(s, (char**)&s, 10);
 
         if (value2 >= value1)
            for (unsigned i=value1; i<=value2; i++)
               list->push_back(i);
         else {
            // this is stupid. simple loop like this
            // for (unsigned i=value1; i>=value2; i--)
            // does not work for range 4-0, because value2 is 0,
            // and x>=0 is always true for unsigned numbers,
            // so we would loop forever... K.O.
            for (unsigned i=value1; i!=value2; i--)
               list->push_back(i);
            list->push_back(value2);
         }
      } else {
         list->push_back(value1);
      }
 
      if (*s == ',') {
         s++; // skip the comma char
         continue; // back to the begin of loop
      }
 
      if (*s == ']') {
         s++; // skip the closing bracket
         s = NULL;
         continue; // done
      }
 
      cm_msg(MERROR, method, "invalid char in array index in \"%s\" at \"%s\"", path, s);
      return DB_OUT_OF_RANGE;
   }
 
#if 0
   printf("parsed array indices for \"%s\" size is %d: ", path, (int)list->size());
   for (unsigned i=0; i<list->size(); i++)
      printf(" %d", (*list)[i]);
   printf("\n");
#endif
 
   return SUCCESS;
}
 
static MJsonNode* js_db_get_values(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get values of ODB data from given subtrees");
      doc->P("paths[]", MJSON_STRING, "array of ODB subtree paths, see note on array indices");
      doc->P("omit_names?", MJSON_BOOL, "omit the /name entries");
      doc->P("omit_last_written?", MJSON_BOOL, "omit the /last_written entries and the last_written[] result");
      doc->P("omit_tid?", MJSON_BOOL, "omit the tid[] result");
      doc->P("omit_old_timestamp?", MJSON_NUMBER, "omit data older than given ODB timestamp");
      doc->P("preserve_case?", MJSON_BOOL, "preserve the capitalization of ODB key names (WARNING: ODB is not case sensitive); note that this will also have side effect of setting the omit_names option");
      doc->R("data[]", 0, "values of ODB data for each path, all key names are in lower case, all symlinks are followed");
      doc->R("status[]", MJSON_INT, "return status of db_copy_json_values() or db_copy_json_index() for each path");
      doc->R("tid?[]", MJSON_INT, "odb type id for each path, absent if omit_tid is true");
      doc->R("last_written?[]", MJSON_NUMBER, "last_written value of the ODB subtree for each path, absent if omit_last_written is true");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths = mjsonrpc_get_param_array(params, "paths", &error); if (error) return error;
 
   bool omit_names = mjsonrpc_get_param(params, "omit_names", NULL)->GetBool();
   bool omit_last_written = mjsonrpc_get_param(params, "omit_last_written", NULL)->GetBool();
   bool omit_tid = mjsonrpc_get_param(params, "omit_tid", NULL)->GetBool();
   double xomit_old_timestamp = mjsonrpc_get_param(params, "omit_old_timestamp", NULL)->GetDouble();
   time_t omit_old_timestamp = (time_t)xomit_old_timestamp;
   bool preserve_case = mjsonrpc_get_param(params, "preserve_case", NULL)->GetBool();
   
   MJsonNode* dresult = MJsonNode::MakeArray();
   MJsonNode* sresult = MJsonNode::MakeArray();
   MJsonNode* tresult = MJsonNode::MakeArray();
   MJsonNode* lwresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      KEY key;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_key(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         dresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
         tresult->AddToArray(MJsonNode::MakeNull());
         lwresult->AddToArray(MJsonNode::MakeNull());
         continue;
      }
 
      status = db_get_key(hDB, hkey, &key);
      if (status != DB_SUCCESS) {
         dresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
         tresult->AddToArray(MJsonNode::MakeNull());
         lwresult->AddToArray(MJsonNode::MakeNull());
         continue;
      }
 
      if (path.find("[") != std::string::npos) {
         std::vector<unsigned> list;
         status = parse_array_index_list("js_db_get_values", path.c_str(), &list);
 
         if (status != SUCCESS) {
            dresult->AddToArray(MJsonNode::MakeNull());
            sresult->AddToArray(MJsonNode::MakeInt(status));
            tresult->AddToArray(MJsonNode::MakeInt(key.type));
            lwresult->AddToArray(MJsonNode::MakeInt(key.last_written));
            continue;
         }
 
         if (list.size() > 1) {
            MJsonNode *ddresult = MJsonNode::MakeArray();
            MJsonNode *ssresult = MJsonNode::MakeArray();
 
            for (unsigned i=0; i<list.size(); i++) {
               char* buf = NULL;
               int bufsize = 0;
               int end = 0;
               
               status = db_copy_json_index(hDB, hkey, list[i], &buf, &bufsize, &end);
               if (status == DB_SUCCESS) {
                  ss_repair_utf8(buf);
                  ddresult->AddToArray(MJsonNode::MakeJSON(buf));
                  ssresult->AddToArray(MJsonNode::MakeInt(status));
               } else {
                  ddresult->AddToArray(MJsonNode::MakeNull());
                  ssresult->AddToArray(MJsonNode::MakeInt(status));
               }
 
               if (buf)
                  free(buf);
            }
 
            dresult->AddToArray(ddresult);
            sresult->AddToArray(ssresult);
            tresult->AddToArray(MJsonNode::MakeInt(key.type));
            lwresult->AddToArray(MJsonNode::MakeInt(key.last_written));
 
         } else {
            char* buf = NULL;
            int bufsize = 0;
            int end = 0;
            
            status = db_copy_json_index(hDB, hkey, list[0], &buf, &bufsize, &end);
            if (status == DB_SUCCESS) {
               ss_repair_utf8(buf);
               dresult->AddToArray(MJsonNode::MakeJSON(buf));
               sresult->AddToArray(MJsonNode::MakeInt(status));
               tresult->AddToArray(MJsonNode::MakeInt(key.type));
               lwresult->AddToArray(MJsonNode::MakeInt(key.last_written));
            } else {
               dresult->AddToArray(MJsonNode::MakeNull());
               sresult->AddToArray(MJsonNode::MakeInt(status));
               tresult->AddToArray(MJsonNode::MakeInt(key.type));
               lwresult->AddToArray(MJsonNode::MakeInt(key.last_written));
            }
            
            if (buf)
               free(buf);
         }
      } else {
         char* buf = NULL;
         int bufsize = 0;
         int end = 0;
 
         status = db_copy_json_values(hDB, hkey, &buf, &bufsize, &end, omit_names,
                                      omit_last_written, omit_old_timestamp, preserve_case);
 
         if (status == DB_SUCCESS) {
            ss_repair_utf8(buf);
            dresult->AddToArray(MJsonNode::MakeJSON(buf));
            sresult->AddToArray(MJsonNode::MakeInt(status));
            tresult->AddToArray(MJsonNode::MakeInt(key.type));
            lwresult->AddToArray(MJsonNode::MakeInt(key.last_written));
         } else {
            dresult->AddToArray(MJsonNode::MakeNull());
            sresult->AddToArray(MJsonNode::MakeInt(status));
            tresult->AddToArray(MJsonNode::MakeInt(key.type));
            lwresult->AddToArray(MJsonNode::MakeInt(key.last_written));
         }
 
         if (buf)
            free(buf);
      }
   }
 
   MJsonNode* result = MJsonNode::MakeObject();
 
   result->AddToObject("data", dresult);
   result->AddToObject("status", sresult);
   if (!omit_tid)
      result->AddToObject("tid", tresult);
   else
      delete tresult;
   if (!omit_last_written)
      result->AddToObject("last_written", lwresult);
   else
      delete lwresult;
 
   return mjsonrpc_make_result(result);
}
 
static MJsonNode* js_db_ls(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get contents of given ODB subdirectory in the \"ls\" json encoding - similar to odbedit command \"ls -l\"");
      doc->P("paths[]",  MJSON_STRING, "array of ODB subtree paths");
      doc->R("data[]",   MJSON_OBJECT, "keys and values of ODB data for each path");
      doc->R("status[]", MJSON_INT, "return status of db_copy_json_ls() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths = mjsonrpc_get_param_array(params, "paths", &error); if (error) return error;
 
   MJsonNode* dresult = MJsonNode::MakeArray();
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_key(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         dresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      char* buf = NULL;
      int bufsize = 0;
      int end = 0;
 
      status = db_copy_json_ls(hDB, hkey, &buf, &bufsize, &end);
 
      if (status == DB_SUCCESS) {
         ss_repair_utf8(buf);
         dresult->AddToArray(MJsonNode::MakeJSON(buf));
         sresult->AddToArray(MJsonNode::MakeInt(status));
      } else {
         dresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
      }
 
      if (buf)
         free(buf);
   }
 
   return mjsonrpc_make_result("data", dresult, "status", sresult);
}
 
static MJsonNode* js_db_copy(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get complete ODB data in the \"save\" json encoding, suitable for reloading with odbedit command \"load\"");
      doc->P("paths[]",  MJSON_STRING, "array of ODB subtree paths");
      doc->R("data[]",   MJSON_OBJECT, "keys and values of ODB data for each path");
      doc->R("status[]", MJSON_INT, "return status of db_copy_json_save() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths = mjsonrpc_get_param_array(params, "paths", &error); if (error) return error;
 
   MJsonNode* dresult = MJsonNode::MakeArray();
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_key(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         dresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      char* buf = NULL;
      int bufsize = 0;
      int end = 0;
 
      status = db_copy_json_save(hDB, hkey, &buf, &bufsize, &end);
 
      if (status == DB_SUCCESS) {
         ss_repair_utf8(buf);
         dresult->AddToArray(MJsonNode::MakeJSON(buf));
         sresult->AddToArray(MJsonNode::MakeInt(status));
      } else {
         dresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
      }
 
      if (buf)
         free(buf);
   }
 
   return mjsonrpc_make_result("data", dresult, "status", sresult);
}
 
static MJsonNode* js_db_paste(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("write data into ODB");
      doc->P("paths[]", MJSON_STRING, "array of ODB subtree paths, see note on array indices");
      doc->P("values[]", 0, "array of data values written to ODB via db_paste_json() for each path");
      doc->R("status[]", MJSON_INT, "array of return status of db_paste_json() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths  = mjsonrpc_get_param_array(params, "paths",  &error); if (error) return error;
   const MJsonNodeVector* values = mjsonrpc_get_param_array(params, "values", &error); if (error) return error;
 
   if (paths->size() != values->size()) {
      return mjsonrpc_make_error(-32602, "Invalid params", "paths and values should have the same length");
   }
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_key(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      const MJsonNode* v = (*values)[i];
      assert(v != NULL);
 
      if (path.find("[*]") != std::string::npos) {
 
         KEY key;
         db_get_key(hDB, hkey, &key);
         for (int j=0 ; j<key.num_values ; j++)
            status = db_paste_json_node(hDB, hkey, j, v);
 
      } else if (path.find("[") != std::string::npos) {
         std::vector<unsigned> list;
         status = parse_array_index_list("js_db_paste", path.c_str(), &list);
 
         if (status != SUCCESS) {
            sresult->AddToArray(MJsonNode::MakeInt(status));
            continue;
         }
 
         // supported permutations of array indices and data values:
         // single index: intarray[1] -> data should be a single value: MJSON_ARRAY is rejected right here, MJSON_OBJECT is rejected by db_paste
         // multiple index intarray[1,2,3] -> data should be an array of equal length, or
         // multiple index intarray[1,2,3] -> if data is a single value, all array elements are set to this same value
         
         if (list.size() < 1) {
            cm_msg(MERROR, "js_db_paste", "invalid array indices for array path \"%s\"", path.c_str());
            sresult->AddToArray(MJsonNode::MakeInt(DB_TYPE_MISMATCH));
            continue;
         } else if (list.size() == 1) {
            if (v->GetType() == MJSON_ARRAY) {
               cm_msg(MERROR, "js_db_paste", "unexpected array of values for array path \"%s\"", path.c_str());
               sresult->AddToArray(MJsonNode::MakeInt(DB_TYPE_MISMATCH));
               continue;
            }
 
            status = db_paste_json_node(hDB, hkey, list[0], v);
            sresult->AddToArray(MJsonNode::MakeInt(status));
         } else if ((list.size() > 1) && (v->GetType() == MJSON_ARRAY)) {
            const MJsonNodeVector* vvalues = v->GetArray();
 
            if (list.size() != vvalues->size()) {
               cm_msg(MERROR, "js_db_paste", "length of values array %d should be same as number of indices %d for array path \"%s\"", (int)vvalues->size(), (int)list.size(), path.c_str());
               sresult->AddToArray(MJsonNode::MakeInt(DB_TYPE_MISMATCH));
               continue;
            }
 
            MJsonNode *ssresult = MJsonNode::MakeArray();
 
            for (unsigned j =0; j <list.size(); j++) {
               const MJsonNode* vv = (*vvalues)[j];
 
               if (vv == NULL) {
                  cm_msg(MERROR, "js_db_paste", "internal error: NULL array value at index %d for array path \"%s\"", j, path.c_str());
                  sresult->AddToArray(MJsonNode::MakeInt(DB_TYPE_MISMATCH));
                  continue;
               }
 
               status = db_paste_json_node(hDB, hkey, list[j], vv);
               ssresult->AddToArray(MJsonNode::MakeInt(status));
            }
            
            sresult->AddToArray(ssresult);
         } else {
            MJsonNode *ssresult = MJsonNode::MakeArray();
            for (unsigned j =0; j <list.size(); j++) {
               status = db_paste_json_node(hDB, hkey, list[j], v);
               ssresult->AddToArray(MJsonNode::MakeInt(status));
            }
            sresult->AddToArray(ssresult);
         }
      } else {
         status = db_paste_json_node(hDB, hkey, 0, v);
         sresult->AddToArray(MJsonNode::MakeInt(status));
      }
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_create(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Create new ODB entries");
      MJSO* o = doc->PA("array of ODB paths to be created")->AddObject("", "arguments to db_create_key() and db_set_num_values()");
      o->Add("path", MJSON_STRING, "ODB path to be created");
      o->Add("type", MJSON_INT, "MIDAS TID_xxx type");
      o->Add("array_length?", MJSON_INT, "optional array length, default is 1");
      o->Add("string_length?", MJSON_INT, "for TID_STRING, optional string length, default is NAME_LENGTH");
      doc->R("status[]", MJSON_INT, "return status of db_create_key(), db_set_num_values() and db_set_data() (for TID_STRING) for each path");
      return doc;
   }
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   const MJsonNodeVector* pp = params->GetArray();
 
   if (!pp) {
      return mjsonrpc_make_error(-32602, "Invalid params", "parameters must be an array of objects");
   }
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<pp->size(); i++) {
      const MJsonNode* p = (*pp)[i];
      std::string path = mjsonrpc_get_param(p, "path", NULL)->GetString();
      int type = mjsonrpc_get_param(p, "type", NULL)->GetInt();
      int array_length = mjsonrpc_get_param(p, "array_length", NULL)->GetInt();
      int string_length = mjsonrpc_get_param(p, "string_length", NULL)->GetInt();
 
      //printf("create odb [%s], type %d, array %d, string %d\n", path.c_str(), type, array_length, string_length);
 
      if (string_length == 0)
         string_length = NAME_LENGTH;
 
      int status = db_create_key(hDB, 0, path.c_str(), type);
 
      if (status == DB_SUCCESS && string_length > 0 && type == TID_STRING) {
         HNDLE hKey;
         status = db_find_key(hDB, 0, path.c_str(), &hKey);
         if (status == DB_SUCCESS) {
            char* buf = (char*)calloc(1, string_length);
            assert(buf != NULL);
            int size = string_length;
            status = db_set_data(hDB, hKey, buf, size, 1, TID_STRING);
            free(buf);
         }
      }
 
      if (status == DB_SUCCESS && array_length > 1) {
         HNDLE hKey;
         status = db_find_key(hDB, 0, path.c_str(), &hKey);
         if (status == DB_SUCCESS)
            status = db_set_num_values(hDB, hKey, array_length);
      }
 
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_delete(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("delete ODB keys");
      doc->P("paths[]", MJSON_STRING, "array of ODB paths to delete");
      doc->R("status[]", MJSON_INT, "return status of db_delete_key() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths  = mjsonrpc_get_param_array(params, "paths",  &error); if (error) return error;
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_link(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      status = db_delete_key(hDB, hkey, false);
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_resize(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Change size of ODB arrays");
      doc->P("paths[]", MJSON_STRING, "array of ODB paths to resize");
      doc->P("new_lengths[]", MJSON_INT, "array of new lengths for each ODB path");
      doc->R("status[]", MJSON_INT, "return status of db_set_num_values() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths   = mjsonrpc_get_param_array(params, "paths",  &error); if (error) return error;
   const MJsonNodeVector* lengths = mjsonrpc_get_param_array(params, "new_lengths", &error); if (error) return error;
 
   if (paths->size() != lengths->size()) {
      return mjsonrpc_make_error(-32602, "Invalid params", "arrays \"paths\" and \"new_lengths\" should have the same length");
   }
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_key(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      int length = (*lengths)[i]->GetInt();
      if (length < 1) {
         sresult->AddToArray(MJsonNode::MakeInt(DB_INVALID_PARAM));
         continue;
      }
 
      status = db_set_num_values(hDB, hkey, length);
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_resize_string(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Change size of ODB string arrays");
      doc->P("paths[]", MJSON_STRING, "array of ODB paths to resize");
      doc->P("new_lengths[]", MJSON_INT, "array of new lengths for each ODB path");
      doc->P("new_string_lengths[]", MJSON_INT, "array of new string lengths for each ODB path");
      doc->R("status[]", MJSON_INT, "return status of db_resize_string() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths   = mjsonrpc_get_param_array(params, "paths",  &error); if (error) return error;
   const MJsonNodeVector* lengths = mjsonrpc_get_param_array(params, "new_lengths", &error); if (error) return error;
   const MJsonNodeVector* string_lengths = mjsonrpc_get_param_array(params, "new_string_lengths", &error); if (error) return error;
 
   if (paths->size() != lengths->size()) {
      return mjsonrpc_make_error(-32602, "Invalid params", "arrays \"paths\" and \"new_lengths\" should have the same length");
   }
 
   if (paths->size() != string_lengths->size()) {
      return mjsonrpc_make_error(-32602, "Invalid params", "arrays \"paths\" and \"new_string_lengths\" should have the same length");
   }
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      std::string path = (*paths)[i]->GetString();
 
      int length = (*lengths)[i]->GetInt();
      if (length < 0) {
         sresult->AddToArray(MJsonNode::MakeInt(DB_INVALID_PARAM));
         continue;
      }
 
      int string_length = (*string_lengths)[i]->GetInt();
      if (length < 0) {
         sresult->AddToArray(MJsonNode::MakeInt(DB_INVALID_PARAM));
         continue;
      }
 
      int status = db_resize_string(hDB, 0, path.c_str(), length, string_length);
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_key(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get ODB keys");
      doc->P("paths[]", MJSON_STRING, "array of ODB paths");
      doc->R("status[]", MJSON_INT, "return status of db_key() for each path");
      doc->R("keys[]", MJSON_OBJECT, "key data for each path");
      doc->R("keys[].type", MJSON_INT, "key type TID_xxx");
      doc->R("keys[].num_values", MJSON_INT, "array length, 1 for normal entries");
      doc->R("keys[].name", MJSON_STRING, "key name");
      doc->R("keys[].total_size", MJSON_INT, "data total size in bytes");
      doc->R("keys[].item_size", MJSON_INT, "array element size, string length for TID_STRING");
      doc->R("keys[].access_mode", MJSON_INT, "access mode bitmap of MODE_xxx");
      doc->R("keys[].notify_count", MJSON_INT, "number of hotlinks attached to this key");
      doc->R("keys[].last_written", MJSON_INT, "timestamp when data was last updated");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths  = mjsonrpc_get_param_array(params, "paths",  &error); if (error) return error;
 
   MJsonNode* kresult = MJsonNode::MakeArray();
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      KEY key;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_key(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         kresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      status = db_get_key(hDB, hkey, &key);
      if (status != DB_SUCCESS) {
         kresult->AddToArray(MJsonNode::MakeNull());
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      MJsonNode* jkey = MJsonNode::MakeObject();
 
      jkey->AddToObject("type", MJsonNode::MakeInt(key.type));
      jkey->AddToObject("num_values", MJsonNode::MakeInt(key.num_values));
      ss_repair_utf8(key.name);
      jkey->AddToObject("name", MJsonNode::MakeString(key.name));
      jkey->AddToObject("total_size", MJsonNode::MakeInt(key.total_size));
      jkey->AddToObject("item_size", MJsonNode::MakeInt(key.item_size));
      jkey->AddToObject("access_mode", MJsonNode::MakeInt(key.access_mode));
      jkey->AddToObject("notify_count", MJsonNode::MakeInt(key.notify_count));
      jkey->AddToObject("last_written", MJsonNode::MakeInt(key.last_written));
 
      kresult->AddToArray(jkey);
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("keys", kresult, "status", sresult);
}
 
static MJsonNode* js_db_rename(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Change size of ODB arrays");
      doc->P("paths[]", MJSON_STRING, "array of ODB paths to rename");
      doc->P("new_names[]", MJSON_STRING, "array of new names for each ODB path");
      doc->R("status[]", MJSON_INT, "return status of db_rename_key() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths = mjsonrpc_get_param_array(params, "paths",  &error); if (error) return error;
   const MJsonNodeVector* names = mjsonrpc_get_param_array(params, "new_names", &error); if (error) return error;
 
   if (paths->size() != names->size()) {
      return mjsonrpc_make_error(-32602, "Invalid params", "arrays \"paths\" and \"new_names\" should have the same length");
   }
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      std::string path = (*paths)[i]->GetString();
 
      status = db_find_link(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      std::string new_name = (*names)[i]->GetString();
      if (new_name.length() < 1) {
         sresult->AddToArray(MJsonNode::MakeInt(DB_INVALID_PARAM));
         continue;
      }
 
      status = db_rename_key(hDB, hkey, new_name.c_str());
 
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_link(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Create ODB symlinks");
      doc->P("new_links[]", MJSON_STRING, "array of new symlinks to be created");
      doc->P("target_paths[]", MJSON_STRING, "array of existing ODB paths for each link");
      doc->R("status[]", MJSON_INT, "return status of db_create_link() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* target_paths = mjsonrpc_get_param_array(params, "target_paths",  &error); if (error) return error;
   const MJsonNodeVector* new_links = mjsonrpc_get_param_array(params, "new_links", &error); if (error) return error;
 
   if (target_paths->size() != new_links->size()) {
      return mjsonrpc_make_error(-32602, "Invalid params", "arrays \"target_paths\" and \"new_links\" should have the same length");
   }
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<new_links->size(); i++) {
      int status = 0;
      std::string target_path = (*target_paths)[i]->GetString();
      std::string new_link = (*new_links)[i]->GetString();
      if (new_link.length() < 1) {
         sresult->AddToArray(MJsonNode::MakeInt(DB_INVALID_PARAM));
         continue;
      }
 
      status = db_create_link(hDB, 0, new_link.c_str(), target_path.c_str());
 
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_reorder(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Change order of ODB keys in a subdirectory");
      doc->P("paths[]", MJSON_STRING, "array of new symlinks to be created");
      doc->P("indices[]", MJSON_INT, "array of existing ODB paths for each link");
      doc->R("status[]", MJSON_INT, "return status of db_reorder_key() for each path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* paths = mjsonrpc_get_param_array(params, "paths",  &error); if (error) return error;
   const MJsonNodeVector* indices = mjsonrpc_get_param_array(params, "indices", &error); if (error) return error;
 
   if (paths->size() != indices->size()) {
      return mjsonrpc_make_error(-32602, "Invalid params", "arrays \"paths\" and \"indices\" should have the same length");
   }
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   for (unsigned i=0; i<paths->size(); i++) {
      int status = 0;
      HNDLE hkey;
      std::string path = (*paths)[i]->GetString();
      int index = (*indices)[i]->GetInt();
 
      status = db_find_key(hDB, 0, path.c_str(), &hkey);
      if (status != DB_SUCCESS) {
         sresult->AddToArray(MJsonNode::MakeInt(status));
         continue;
      }
 
      status = db_reorder_key(hDB, hkey, index);
 
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_db_sor(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Show ODB open records starting from given ODB path");
      doc->P("path?", MJSON_STRING, "ODB path");
      doc->R("sor", MJSON_JSON, "return value of db_sor()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string path = mjsonrpc_get_param(params, "path", NULL)->GetString(); if (error) return error;
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   MJsonNode* sor = db_sor(hDB, path.c_str());
 
   return mjsonrpc_make_result("sor", sor);
}
 
static MJsonNode* js_db_scl(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Show ODB clients");
      doc->R("scl", MJSON_JSON, "return value of db_scl()");
      return doc;
   }
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   MJsonNode* scl = db_scl(hDB);
 
   return mjsonrpc_make_result("scl", scl);
}
 
//
// cm_msg code goes here
//
 
static MJsonNode* js_cm_msg_facilities(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get message facilities using cm_msg_facilities()");
      doc->R("status", MJSON_INT, "return status of cm_msg_facilities()");
      doc->R("facilities[]", MJSON_STRING, "array of facility names");
      return doc;
   }
 
   STRING_LIST list;
   
   int status = cm_msg_facilities(&list);
 
   MJsonNode* facilities = MJsonNode::MakeArray();
 
   for (unsigned i=0; i<list.size(); i++) {
      ss_repair_utf8(list[i]);
      facilities->AddToArray(MJsonNode::MakeString(list[i].c_str()));
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status),
                               "facilities", facilities);
}
 
static MJsonNode* js_cm_msg1(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("Generate a midas message using cm_msg1()");
      doc->P("facility?", MJSON_STRING, "message facility, default is \"midas\"");
      doc->P("user?", MJSON_STRING, "message user, default is \"javascript_commands\"");
      doc->P("type?", MJSON_INT, "message type, MT_xxx from midas.h, default is MT_INFO");
      doc->P("message", MJSON_STRING, "message text");
      doc->R("status", MJSON_INT, "return status of cm_msg1()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string facility = mjsonrpc_get_param(params, "facility", &error)->GetString();
   std::string user = mjsonrpc_get_param(params, "user", &error)->GetString();
   int type = mjsonrpc_get_param(params, "type", &error)->GetInt();
   std::string message = mjsonrpc_get_param(params, "message", &error)->GetString(); if (error) return error;
 
   if (facility.size() <1)
      facility = "midas";
   if (user.size()<1)
      user = "javascript_commands";
   if (type == 0)
      type = MT_INFO;
 
   int status = cm_msg1(type, __FILE__, __LINE__, facility.c_str(), user.c_str(), "%s", message.c_str());
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
static MJsonNode* js_cm_msg_retrieve(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("Retrieve midas messages using cm_msg_retrieve2()");
      doc->P("facility?", MJSON_STRING, "message facility, default is \"midas\"");
      doc->P("min_messages?", MJSON_INT, "get at least this many messages, default is 1");
      doc->P("time?", MJSON_NUMBER, "start from given timestamp, value 0 means give me newest messages, default is 0");
      doc->R("num_messages", MJSON_INT, "number of messages returned");
      doc->R("messages", MJSON_STRING, "messages separated by \\n");
      doc->R("status", MJSON_INT, "return status of cm_msg_retrieve2()");
      return doc;
   }
 
   std::string facility = mjsonrpc_get_param(params, "facility", NULL)->GetString();
   int min_messages = mjsonrpc_get_param(params, "min_messages", NULL)->GetInt();
   double time = mjsonrpc_get_param(params, "time", NULL)->GetDouble();
 
   if (facility.size() < 1)
      facility = "midas";
 
   int num_messages = 0;
   char* messages = NULL;
 
   int status = cm_msg_retrieve2(facility.c_str(), (time_t)time, min_messages, &messages, &num_messages);
 
   MJsonNode* result = MJsonNode::MakeObject();
 
   result->AddToObject("status", MJsonNode::MakeInt(status));
   result->AddToObject("num_messages", MJsonNode::MakeInt(num_messages));
 
   if (messages) {
      ss_repair_utf8(messages);
      result->AddToObject("messages", MJsonNode::MakeString(messages));
      free(messages);
      messages = NULL;
   }
 
   return mjsonrpc_make_result(result);
}
 
//
// Alarm code goes here
//
 
static MJsonNode* js_al_reset_alarm(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("reset alarms");
      doc->P("alarms[]", MJSON_STRING, "array of alarm names");
      doc->R("status[]", MJSON_INT, "return status of al_reset_alarm() for each alarm");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   const MJsonNodeVector* alarms  = mjsonrpc_get_param_array(params, "alarms",  &error); if (error) return error;
 
   MJsonNode* sresult = MJsonNode::MakeArray();
 
   for (unsigned i=0; i<alarms->size(); i++) {
      int status = al_reset_alarm((*alarms)[i]->GetString().c_str());
      sresult->AddToArray(MJsonNode::MakeInt(status));
   }
 
   return mjsonrpc_make_result("status", sresult);
}
 
static MJsonNode* js_al_trigger_alarm(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("trigger an alarm");
      doc->P("name", MJSON_STRING, "alarm name");
      doc->P("message", MJSON_STRING, "alarm message");
      doc->P("class", MJSON_STRING, "alarm class");
      doc->P("condition", MJSON_STRING, "alarm condition");
      doc->P("type", MJSON_INT, "alarm type (AT_xxx)");
      doc->R("status", MJSON_INT, "return status of al_trigger_alarm()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string name = mjsonrpc_get_param(params, "name", &error)->GetString(); if (error) return error;
   std::string message = mjsonrpc_get_param(params, "message", &error)->GetString(); if (error) return error;
   std::string xclass = mjsonrpc_get_param(params, "class", &error)->GetString(); if (error) return error;
   std::string condition = mjsonrpc_get_param(params, "condition", &error)->GetString(); if (error) return error;
   int type = mjsonrpc_get_param(params, "type", &error)->GetInt(); if (error) return error;
 
   int status = al_trigger_alarm(name.c_str(), message.c_str(), xclass.c_str(), condition.c_str(), type);
   
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
static MJsonNode* js_al_trigger_class(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("trigger an alarm");
      doc->P("class", MJSON_STRING, "alarm class");
      doc->P("message", MJSON_STRING, "alarm message");
      doc->P("first?", MJSON_BOOL, "see al_trigger_class() in midas.c");
      doc->R("status", MJSON_INT, "return status of al_trigger_class()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string xclass = mjsonrpc_get_param(params, "class", &error)->GetString(); if (error) return error;
   std::string message = mjsonrpc_get_param(params, "message", &error)->GetString(); if (error) return error;
   bool first = mjsonrpc_get_param(params, "first", NULL)->GetBool();
 
   int status = al_trigger_class(xclass.c_str(), message.c_str(), first);
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
//
// History code goes here
//
 
#include "history.h"
 
static MJsonNode* js_hs_get_active_events(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get list of active history events using hs_read_event_list()");
      doc->R("status", MJSON_INT, "return status of hs_read_event_list()");
      doc->R("events[]", MJSON_STRING, "array of history event names");
      return doc;
   }
 
   STRING_LIST list;
   
   int status = hs_read_event_list(&list);
 
   MJsonNode* events = MJsonNode::MakeArray();
 
   for (unsigned i=0; i<list.size(); i++) {
      ss_repair_utf8(list[i]);
      events->AddToArray(MJsonNode::MakeString(list[i].c_str()));
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "events", events);
}
 
typedef std::map<std::string,MidasHistoryInterface*> MhiMap;
 
static MhiMap gHistoryChannels;
 
static MidasHistoryInterface* GetHistory(const char* name)
{
   // empty name means use the default reader channel
 
   MhiMap::iterator ci = gHistoryChannels.find(name);
   if (ci != gHistoryChannels.end()) {
      return ci->second;
   };
 
   int verbose = 0;
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
 
   HNDLE hKey = 0;
 
   if (strlen(name) < 1) {
      int status = hs_find_reader_channel(hDB, &hKey, verbose);
      if (status != HS_SUCCESS) {
         return NULL;
      }
   } else {
      HNDLE hKeyChan;
      int status = db_find_key(hDB, 0, "/Logger/History", &hKeyChan);
      if (status != DB_SUCCESS) {
         return NULL;
      }
      status = db_find_key(hDB, hKeyChan, name, &hKey);
      if (status != DB_SUCCESS) {
         return NULL;
      }
   }
 
   MidasHistoryInterface* mh = NULL;
 
   int status = hs_get_history(hDB, hKey, HS_GET_READER|HS_GET_INACTIVE, verbose, &mh);
   if (status != HS_SUCCESS || mh==NULL) {
      cm_msg(MERROR, "GetHistory", "Cannot configure history, hs_get_history() status %d", status);
      return NULL;
   }
 
   //printf("hs_get_history: \"%s\" -> mh %p\n", name, mh);
 
   gHistoryChannels[name] = mh;
   
   // cm_msg(MINFO, "GetHistory", "Reading history channel \"%s\" from channel \'%s\' type \'%s\'", name, mh->name, mh->type);
 
   return mh;
}
 
static void js_hs_exit()
{
   for (auto& e : gHistoryChannels) {
      //printf("history channel \"%s\" mh %p\n", e.first.c_str(), e.second);
      delete e.second;
   }
   gHistoryChannels.clear();
}
 
static MJsonNode* js_hs_get_channels(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get list of history channels in /Logger/History");
      doc->R("status", MJSON_INT, "return success or failure status");
      doc->R("default_channel", MJSON_STRING, "name of the default logger history channel");
      doc->R("channels[]", MJSON_STRING, "all logger history channel names");
      doc->R("active_channels[]", MJSON_STRING, "active logger history channel names");
      return doc;
   }
 
   MJsonNode* channels = MJsonNode::MakeArray();
   MJsonNode* active_channels = MJsonNode::MakeArray();
 
   HNDLE hDB;
   cm_get_experiment_database(&hDB, NULL);
   
   // get history channel name selected by user in ODB
 
   //std::string selected_channel;
   //db_get_value_string(hDB, 0, "/History/LoggerHistoryChannel", 0, &selected_channel, TRUE);
   
   int status;
   HNDLE hKeyChan;
 
   status = db_find_key(hDB, 0, "/Logger/History", &hKeyChan);
   if (status == DB_SUCCESS) {
      for (int ichan=0; ; ichan++) {
         HNDLE hKey;
         status = db_enum_key(hDB, hKeyChan, ichan, &hKey);
         if (status == DB_NO_MORE_SUBKEYS) {
            status = DB_SUCCESS;
            break;
         }
         if (status != DB_SUCCESS)
            break;
 
         KEY key;
 
         status = db_get_key(hDB, hKey, &key);
 
         if (status == DB_SUCCESS) {
            ss_repair_utf8(key.name);
            channels->AddToArray(MJsonNode::MakeString(key.name));
 
            INT active = 0;
            INT size = sizeof(active);
            status = db_get_value(hDB, hKey, "Active", &active, &size, TID_BOOL, FALSE);
            if (status == DB_SUCCESS) {
               if (active) {
                  active_channels->AddToArray(MJsonNode::MakeString(key.name));
               }
            }
         }
      }
   }
 
   std::string default_channel;
 
   HNDLE hKey;
   status = hs_find_reader_channel(hDB, &hKey, 0);
   if (status == DB_SUCCESS) {
      KEY key;
      status = db_get_key(hDB, hKey, &key);
      if (status == DB_SUCCESS) {
         default_channel = key.name;
      }
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(1),
                               //"selected_channel", MJsonNode::MakeString(selected_channel.c_str()),
                               "default_channel", MJsonNode::MakeString(default_channel.c_str()),
                               "active_channels", active_channels,
                               "channels", channels);
}
 
static MJsonNode* js_hs_get_events(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get list of history events that existed at give time using hs_get_events()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->P("time?", MJSON_NUMBER, "timestamp, value 0 means current time, default is 0");
      doc->R("status", MJSON_INT, "return status of hs_get_events()");
      doc->R("channel", MJSON_STRING, "logger history channel name");
      doc->R("events[]", MJSON_STRING, "array of history event names");
      return doc;
   }
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
   double time = mjsonrpc_get_param(params, "time", NULL)->GetDouble();
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   MJsonNode* events = MJsonNode::MakeArray();
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "events", events);
   }
 
   if (time == 0) {
      time = ::time(NULL);
   }
 
   STRING_LIST list;
   
   int status = mh->hs_get_events(time, &list);
 
   for (unsigned i=0; i<list.size(); i++) {
      ss_repair_utf8(list[i]);
      events->AddToArray(MJsonNode::MakeString(list[i].c_str()));
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "channel", MJsonNode::MakeString(mh->name), "events", events);
}
 
static MJsonNode* js_hs_reopen(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("reopen the history channel to make sure we see the latest list of events using hs_clear_cache()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->R("status", MJSON_INT, "return status of hs_get_events()");
      doc->R("channel", MJSON_STRING, "logger history channel name");
      return doc;
   }
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   int status = mh->hs_clear_cache();
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "channel", MJsonNode::MakeString(mh->name));
}
 
static MJsonNode* js_hs_get_tags(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get list of history tags for given history events that existed at give time using hs_get_tags()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->P("time?", MJSON_NUMBER, "timestamp, value 0 means current time, default is 0");
      doc->P("events[]?", MJSON_STRING, "array of history event names, default is get all events using hs_get_events()");
      doc->R("status", MJSON_INT, "return status");
      doc->R("channel", MJSON_STRING, "logger history channel name");
      doc->R("events[].name", MJSON_STRING, "array of history event names for each history event");
      doc->R("events[].status", MJSON_INT, "array of status ohistory tags for each history event");
      doc->R("events[].tags[]", MJSON_STRING, "array of history tags for each history event");
      doc->R("events[].tags[].name", MJSON_STRING, "history tag name");
      doc->R("events[].tags[].type", MJSON_INT, "history tag midas data type");
      doc->R("events[].tags[].n_data?", MJSON_INT, "history tag number of array elements, omitted if 1");
      return doc;
   }
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
   double time = mjsonrpc_get_param(params, "time", NULL)->GetDouble();
   const MJsonNodeVector* events_array = mjsonrpc_get_param_array(params, "events", NULL);
 
   if (time == 0) {
      time = ::time(NULL);
   }
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   MJsonNode* events = MJsonNode::MakeArray();
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "events", events);
   }
 
   std::vector<std::string> event_names;
 
   if (events_array && events_array->size() > 0) {
      for (unsigned i=0; i<events_array->size(); i++) {
         event_names.push_back((*events_array)[i]->GetString());
      }
   }
 
   if (event_names.size() < 1) {
      int status = mh->hs_get_events(time, &event_names);
      if (status != HS_SUCCESS) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "events", events);
      }
   }
 
   for (unsigned i=0; i<event_names.size(); i++) {
      MJsonNode* o = MJsonNode::MakeObject();
      const char* event_name = event_names[i].c_str();
      std::vector<TAG> tags;
      int status = mh->hs_get_tags(event_name, time, &tags);
      //ss_repair_utf8(event_name); redundant!
      o->AddToObject("name", MJsonNode::MakeString(event_name));
      o->AddToObject("status", MJsonNode::MakeInt(status));
      MJsonNode *ta = MJsonNode::MakeArray();
      for (unsigned j=0; j<tags.size(); j++) {
         MJsonNode* to = MJsonNode::MakeObject();
         ss_repair_utf8(tags[j].name);
         to->AddToObject("name", MJsonNode::MakeString(tags[j].name));
         to->AddToObject("type", MJsonNode::MakeInt(tags[j].type));
         if (tags[j].n_data != 1) {
            to->AddToObject("n_data", MJsonNode::MakeInt(tags[j].n_data));
         }
         ta->AddToArray(to);
      }
      o->AddToObject("tags", ta);
      events->AddToArray(o);
   }
 
   int status = HS_SUCCESS;
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "channel", MJsonNode::MakeString(mh->name), "events", events);
}
 
static MJsonNode* js_hs_get_last_written(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get list of history tags for given history events that existed at give time using hs_get_last_written()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->P("time?", MJSON_NUMBER, "timestamp, value 0 means current time, default is 0");
      doc->P("events[]", MJSON_STRING, "array of history event names");
      doc->P("tags[]", MJSON_STRING, "array of history event tag names");
      doc->P("index[]", MJSON_STRING, "array of history event tag array indices");
      doc->R("status", MJSON_INT, "return status");
      doc->R("channel", MJSON_STRING, "logger history channel name");
      doc->R("last_written[]", MJSON_NUMBER, "array of last-written times for each history event");
      return doc;
   }
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
   double time = mjsonrpc_get_param(params, "time", NULL)->GetDouble();
 
   const MJsonNodeVector* events_array = mjsonrpc_get_param_array(params, "events", NULL);
   const MJsonNodeVector* tags_array = mjsonrpc_get_param_array(params, "tags", NULL);
   const MJsonNodeVector* index_array = mjsonrpc_get_param_array(params, "index", NULL);
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   MJsonNode* lw = MJsonNode::MakeArray();
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "last_written", lw);
   }
 
   unsigned num_var = events_array->size();
 
   if (tags_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and tags should have the same length");
   }
 
   if (index_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and index should have the same length");
   }
 
   std::vector<std::string> event_names(num_var);
   std::vector<std::string> tag_names(num_var);
   // const char** event_name = new const char*[num_var];
   // const char** tag_name = new const char*[num_var];
   int* var_index = new int[num_var];
   time_t* last_written = new time_t[num_var];
 
   for (unsigned i=0; i<num_var; i++) {
      //event_name[i] = (*events_array)[i]->GetString().c_str();
      //tag_name[i] = (*tags_array)[i]->GetString().c_str();
      event_names[i] = (*events_array)[i]->GetString();
      tag_names[i] = (*tags_array)[i]->GetString();
      var_index[i] = (*index_array)[i]->GetInt();
   }
 
   if (/* DISABLES CODE */ (0)) {
      printf("time %f, num_vars %d:\n", time, num_var);
      for (unsigned i=0; i<num_var; i++) {
         printf("%d: [%s] [%s] [%d]\n", i, event_names[i].c_str(), tag_names[i].c_str(), var_index[i]);
      }
   }
 
   if (time == 0) {
      time = ::time(NULL);
   }
 
   
   const char** event_name = new const char*[num_var];
   const char** tag_name = new const char*[num_var];
   for (unsigned i=0; i<num_var; i++) {
      event_name[i] = event_names[i].c_str();
      tag_name[i] = tag_names[i].c_str();
   }
   int status = mh->hs_get_last_written(time, num_var, event_name, tag_name, var_index, last_written);
 
   for (unsigned i=0; i<num_var; i++) {
      if (/* DISABLES CODE */ (0)) {
         printf("%d: last_written %d\n", i, (int)last_written[i]);
      }
      lw->AddToArray(MJsonNode::MakeNumber(last_written[i]));
   }
 
   delete[] event_name;
   delete[] tag_name;
   delete[] var_index;
   delete[] last_written;
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "channel", MJsonNode::MakeString(mh->name), "last_written", lw);
}
 
class JsonHistoryBuffer: public MidasHistoryBufferInterface
{
public:
   int fCount;
   std::string fTimeJson;
   std::string fValueJson;
 
public:
   JsonHistoryBuffer() // ctor
   {
      fCount = 0;
      
      fTimeJson = "[";
      fValueJson = "[";
   }
 
   void Add(time_t t, double v)
   {
      //printf("add time %d, value %f\n", (int)t, v);
 
      if (fCount>0) {
         fTimeJson += ",";
         fValueJson += ",";
      }
      fCount++;
 
      fTimeJson += MJsonNode::EncodeDouble(t);
      fValueJson += MJsonNode::EncodeDouble(v);
   }
 
   void Finish()
   {
      fTimeJson += "]";
      fValueJson += "]";
   }
};
 
static MJsonNode* js_hs_read(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get history data for given history events that existed at give time using hs_read_buffer()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->P("start_time", MJSON_NUMBER, "start time of the data");
      doc->P("end_time", MJSON_NUMBER, "end time of the data");
      doc->P("events[]", MJSON_STRING, "array of history event names");
      doc->P("tags[]", MJSON_STRING, "array of history event tag names");
      doc->P("index[]", MJSON_STRING, "array of history event tag array indices");
      doc->R("status", MJSON_INT, "return status");
      doc->R("channel", MJSON_STRING, "logger history channel name");
      doc->R("data[]", MJSON_ARRAY, "array of history data");
      doc->R("data[].status", MJSON_INT, "status for each event");
      doc->R("data[].count", MJSON_INT, "number of data for each event");
      doc->R("data[].time[]", MJSON_NUMBER, "time data");
      doc->R("data[].value[]", MJSON_NUMBER, "value data");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
   double start_time = mjsonrpc_get_param(params, "start_time", &error)->GetDouble(); if (error) return error;
   double end_time = mjsonrpc_get_param(params, "end_time", &error)->GetDouble(); if (error) return error;
 
   const MJsonNodeVector* events_array = mjsonrpc_get_param_array(params, "events", NULL);
   const MJsonNodeVector* tags_array = mjsonrpc_get_param_array(params, "tags", NULL);
   const MJsonNodeVector* index_array = mjsonrpc_get_param_array(params, "index", NULL);
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   MJsonNode* data = MJsonNode::MakeArray();
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "data", data);
   }
 
   unsigned num_var = events_array->size();
 
   if (tags_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and tags should have the same length");
   }
 
   if (index_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and index should have the same length");
   }
 
   std::vector<std::string> event_names(num_var);
   std::vector<std::string> tag_names(num_var);
   int* var_index = new int[num_var];
   JsonHistoryBuffer** jbuf = new JsonHistoryBuffer*[num_var];
   MidasHistoryBufferInterface** buf = new MidasHistoryBufferInterface*[num_var];
   int* hs_status = new int[num_var];
 
   for (unsigned i=0; i<num_var; i++) {
      //event_name[i] = (*events_array)[i]->GetString().c_str();
      //tag_name[i] = (*tags_array)[i]->GetString().c_str();
      event_names[i] = (*events_array)[i]->GetString();
      tag_names[i] = (*tags_array)[i]->GetString();
      var_index[i] = (*index_array)[i]->GetInt();
      jbuf[i] = new JsonHistoryBuffer();
      buf[i] = jbuf[i];
      hs_status[i] = 0;
   }
 
   if (/* DISABLES CODE */ (0)) {
      printf("time %f %f, num_vars %d:\n", start_time, end_time, num_var);
      for (unsigned i=0; i<num_var; i++) {
         printf("%d: [%s] [%s] [%d]\n", i, event_names[i].c_str(), tag_names[i].c_str(), var_index[i]);
      }
   }
 
   const char** event_name = new const char*[num_var];
   const char** tag_name = new const char*[num_var];
   for (unsigned i=0; i<num_var; i++) {
      event_name[i] = event_names[i].c_str();
      tag_name[i] = tag_names[i].c_str();
   }
 
   int status = mh->hs_read_buffer(start_time, end_time, num_var, event_name, tag_name, var_index, buf, hs_status);
 
   for (unsigned i=0; i<num_var; i++) {
      jbuf[i]->Finish();
 
      MJsonNode* obj = MJsonNode::MakeObject();
      obj->AddToObject("status", MJsonNode::MakeInt(hs_status[i]));
      obj->AddToObject("count", MJsonNode::MakeInt(jbuf[i]->fCount));
      obj->AddToObject("time", MJsonNode::MakeJSON(jbuf[i]->fTimeJson.c_str()));
      obj->AddToObject("value", MJsonNode::MakeJSON(jbuf[i]->fValueJson.c_str()));
      data->AddToArray(obj);
 
      delete jbuf[i];
      jbuf[i] = NULL;
      buf[i] = NULL;
   }
 
   delete[] event_name;
   delete[] tag_name;
   delete[] var_index;
   delete[] buf;
   delete[] jbuf;
   delete[] hs_status;
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "channel", MJsonNode::MakeString(mh->name), "data", data);
}
 
static MJsonNode* js_hs_read_binned(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get history data for given history events that existed at give time using hs_read_buffer()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->P("start_time", MJSON_NUMBER, "start time of the data");
      doc->P("end_time", MJSON_NUMBER, "end time of the data");
      doc->P("num_bins", MJSON_INT, "number of time bins");
      doc->P("events[]", MJSON_STRING, "array of history event names");
      doc->P("tags[]", MJSON_STRING, "array of history event tag names");
      doc->P("index[]", MJSON_STRING, "array of history event tag array indices");
      doc->R("status", MJSON_INT, "return status");
      doc->R("channel", MJSON_STRING, "logger history channel name");
      doc->R("data[]", MJSON_ARRAY, "array of history data");
      doc->R("data[].status", MJSON_INT, "status for each event");
      doc->R("data[].num_entries", MJSON_INT, "number of data points for each event");
      doc->R("data[].count[]", MJSON_INT, "number of data points for each bin");
      doc->R("data[].mean[]", MJSON_NUMBER, "mean for each bin");
      doc->R("data[].rms[]", MJSON_NUMBER, "rms for each bin");
      doc->R("data[].min[]", MJSON_NUMBER, "minimum value for each bin");
      doc->R("data[].max[]", MJSON_NUMBER, "maximum value for each bin");
      doc->R("data[].bins_first_time[]", MJSON_NUMBER, "first data point in each bin");
      doc->R("data[].bins_first_value[]", MJSON_NUMBER, "first data point in each bin");
      doc->R("data[].bins_last_time[]", MJSON_NUMBER, "last data point in each bin");
      doc->R("data[].bins_last_value[]", MJSON_NUMBER, "last data point in each bin");
      doc->R("data[].last_time", MJSON_NUMBER, "time of last data entry");
      doc->R("data[].last_value", MJSON_NUMBER, "value of last data entry");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
   double start_time = mjsonrpc_get_param(params, "start_time", &error)->GetDouble(); if (error) return error;
   double end_time = mjsonrpc_get_param(params, "end_time", &error)->GetDouble(); if (error) return error;
   int num_bins = mjsonrpc_get_param(params, "num_bins", &error)->GetInt(); if (error) return error;
 
   if (num_bins < 1) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Value of num_bins should be 1 or more");
   }
 
   const MJsonNodeVector* events_array = mjsonrpc_get_param_array(params, "events", NULL);
   const MJsonNodeVector* tags_array = mjsonrpc_get_param_array(params, "tags", NULL);
   const MJsonNodeVector* index_array = mjsonrpc_get_param_array(params, "index", NULL);
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   MJsonNode* data = MJsonNode::MakeArray();
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "data", data);
   }
 
   unsigned num_var = events_array->size();
 
   if (num_var < 1) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Array of events should have 1 or more elements");
   }
 
   if (tags_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and tags should have the same length");
   }
 
   if (index_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and index should have the same length");
   }
   
   std::vector<std::string> event_names(num_var);
   std::vector<std::string> tag_names(num_var);
   //const char** event_name = new const char*[num_var];
   //const char** tag_name = new const char*[num_var];
   int* var_index = new int[num_var];
 
   int* num_entries = new int[num_var];
   time_t* last_time = new time_t[num_var];
   double* last_value = new double[num_var];
   int* hs_status = new int[num_var];
 
   int** count_bins = new int*[num_var];
   double** mean_bins = new double*[num_var];
   double** rms_bins = new double*[num_var];
   double** min_bins = new double*[num_var];
   double** max_bins = new double*[num_var];
 
   time_t** bins_first_time = new time_t*[num_var];
   time_t** bins_last_time  = new time_t*[num_var];
 
   double** bins_first_value = new double*[num_var];
   double** bins_last_value  = new double*[num_var];
 
   for (unsigned i=0; i<num_var; i++) {
      //event_name[i] = (*events_array)[i]->GetString().c_str();
      //tag_name[i] = (*tags_array)[i]->GetString().c_str();
      event_names[i] = (*events_array)[i]->GetString();
      tag_names[i] = (*tags_array)[i]->GetString();
      var_index[i] = (*index_array)[i]->GetInt();
      num_entries[i] = 0;
      last_time[i] = 0;
      last_value[i] = 0;
      hs_status[i] = 0;
      count_bins[i] = new int[num_bins];
      mean_bins[i] = new double[num_bins];
      rms_bins[i] = new double[num_bins];
      min_bins[i] = new double[num_bins];
      max_bins[i] = new double[num_bins];
 
      bins_first_time[i] = new time_t[num_bins];
      bins_last_time[i] = new time_t[num_bins];
 
      bins_first_value[i] = new double[num_bins];
      bins_last_value[i] = new double[num_bins];
   }
 
   if (/* DISABLES CODE */ (0)) {
      printf("time %f %f, num_vars %d:\n", start_time, end_time, num_var);
      for (unsigned i=0; i<num_var; i++) {
         printf("%d: [%s] [%s] [%d]\n", i, event_names[i].c_str(), tag_names[i].c_str(), var_index[i]);
      }
   }
 
   const char** event_name = new const char*[num_var];
   const char** tag_name = new const char*[num_var];
   for (unsigned i=0; i<num_var; i++) {
      event_name[i] = event_names[i].c_str();
      tag_name[i] = tag_names[i].c_str();
   }
 
   int status = mh->hs_read_binned(start_time, end_time, num_bins, num_var, event_name, tag_name, var_index, num_entries, count_bins, mean_bins, rms_bins, min_bins, max_bins, bins_first_time, bins_first_value, bins_last_time, bins_last_value, last_time, last_value, hs_status);
 
   for (unsigned i=0; i<num_var; i++) {
      MJsonNode* obj = MJsonNode::MakeObject();
      obj->AddToObject("status", MJsonNode::MakeInt(hs_status[i]));
      obj->AddToObject("num_entries", MJsonNode::MakeInt(num_entries[i]));
      
      MJsonNode* a1 = MJsonNode::MakeArray();
      MJsonNode* a2 = MJsonNode::MakeArray();
      MJsonNode* a3 = MJsonNode::MakeArray();
      MJsonNode* a4 = MJsonNode::MakeArray();
      MJsonNode* a5 = MJsonNode::MakeArray();
 
      MJsonNode* b1 = MJsonNode::MakeArray();
      MJsonNode* b2 = MJsonNode::MakeArray();
      MJsonNode* b3 = MJsonNode::MakeArray();
      MJsonNode* b4 = MJsonNode::MakeArray();
 
      for (int j=0; j<num_bins; j++) {
         a1->AddToArray(MJsonNode::MakeInt(count_bins[i][j]));
         a2->AddToArray(MJsonNode::MakeNumber(mean_bins[i][j]));
         a3->AddToArray(MJsonNode::MakeNumber(rms_bins[i][j]));
         a4->AddToArray(MJsonNode::MakeNumber(min_bins[i][j]));
         a5->AddToArray(MJsonNode::MakeNumber(max_bins[i][j]));
 
         b1->AddToArray(MJsonNode::MakeNumber(bins_first_time[i][j]));
         b2->AddToArray(MJsonNode::MakeNumber(bins_first_value[i][j]));
         b3->AddToArray(MJsonNode::MakeNumber(bins_last_time[i][j]));
         b4->AddToArray(MJsonNode::MakeNumber(bins_last_value[i][j]));
      }
 
      obj->AddToObject("count", a1);
      obj->AddToObject("mean", a2);
      obj->AddToObject("rms", a3);
      obj->AddToObject("min", a4);
      obj->AddToObject("max", a5);
      obj->AddToObject("bins_first_time", b1);
      obj->AddToObject("bins_first_value", b2);
      obj->AddToObject("bins_last_time", b3);
      obj->AddToObject("bins_last_value", b4);
      obj->AddToObject("last_time", MJsonNode::MakeNumber(last_time[i]));
      obj->AddToObject("last_value", MJsonNode::MakeNumber(last_value[i]));
      data->AddToArray(obj);
 
      delete count_bins[i];
      delete mean_bins[i];
      delete rms_bins[i];
      delete min_bins[i];
      delete max_bins[i];
 
      delete bins_first_time[i];
      delete bins_first_value[i];
      delete bins_last_time[i];
      delete bins_last_value[i];
   }
 
   delete[] count_bins;
   delete[] mean_bins;
   delete[] rms_bins;
   delete[] min_bins;
   delete[] max_bins;
 
   delete[] bins_first_time;
   delete[] bins_first_value;
   delete[] bins_last_time;
   delete[] bins_last_value;
 
   delete[] event_name;
   delete[] tag_name;
   delete[] var_index;
 
   delete[] num_entries;
   delete[] last_time;
   delete[] last_value;
   delete[] hs_status;
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "channel", MJsonNode::MakeString(mh->name), "data", data);
}
 
class BinaryHistoryBuffer: public MidasHistoryBufferInterface
{
public:
   std::vector<double> fTimes;
   std::vector<double> fValues;
 
public:
   BinaryHistoryBuffer() // ctor
   {
      // empty
   }
 
   void Add(time_t t, double v)
   {
      //printf("add time %d, value %f\n", (int)t, v);
 
      fTimes.push_back(t);
      fValues.push_back(v);
   }
 
   void Finish()
   {
      assert(fTimes.size() == fValues.size());
   }
};
 
static MJsonNode* js_hs_read_arraybuffer(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get history data for given history events that existed at give time using hs_read_buffer()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->P("start_time", MJSON_NUMBER, "start time of the data");
      doc->P("end_time", MJSON_NUMBER, "end time of the data");
      doc->P("events[]", MJSON_STRING, "array of history event names");
      doc->P("tags[]", MJSON_STRING, "array of history event tag names");
      doc->P("index[]", MJSON_STRING, "array of history event tag array indices");
      doc->R("binary data", MJSON_ARRAYBUFFER, "binary data, see documentation");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
   double start_time = mjsonrpc_get_param(params, "start_time", &error)->GetDouble(); if (error) return error;
   double end_time = mjsonrpc_get_param(params, "end_time", &error)->GetDouble(); if (error) return error;
 
   const MJsonNodeVector* events_array = mjsonrpc_get_param_array(params, "events", NULL);
   const MJsonNodeVector* tags_array = mjsonrpc_get_param_array(params, "tags", NULL);
   const MJsonNodeVector* index_array = mjsonrpc_get_param_array(params, "index", NULL);
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   size_t num_var = events_array->size();
 
   if (tags_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and tags should have the same length");
   }
 
   if (index_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and index should have the same length");
   }
 
   std::vector<std::string> event_names(num_var);
   std::vector<std::string> tag_names(num_var);
   int* var_index = new int[num_var];
   BinaryHistoryBuffer** jbuf = new BinaryHistoryBuffer*[num_var];
   MidasHistoryBufferInterface** buf = new MidasHistoryBufferInterface*[num_var];
   int* hs_status = new int[num_var];
 
   for (size_t i=0; i<num_var; i++) {
      //event_name[i] = (*events_array)[i]->GetString().c_str();
      //tag_name[i] = (*tags_array)[i]->GetString().c_str();
      event_names[i] = (*events_array)[i]->GetString();
      tag_names[i] = (*tags_array)[i]->GetString();
      var_index[i] = (*index_array)[i]->GetInt();
      jbuf[i] = new BinaryHistoryBuffer();
      buf[i] = jbuf[i];
      hs_status[i] = 0;
   }
 
   if (/* DISABLES CODE */ (0)) {
      printf("time %f %f, num_vars %d:\n", start_time, end_time, int(num_var));
      for (size_t i=0; i<num_var; i++) {
         printf("%d: [%s] [%s] [%d]\n", int(i), event_names[i].c_str(), tag_names[i].c_str(), var_index[i]);
      }
   }
 
   const char** event_name = new const char*[num_var];
   const char** tag_name = new const char*[num_var];
   for (unsigned i=0; i<num_var; i++) {
      event_name[i] = event_names[i].c_str();
      tag_name[i] = tag_names[i].c_str();
   }
 
   int status = mh->hs_read_buffer(start_time, end_time, num_var, event_name, tag_name, var_index, buf, hs_status);
 
   size_t num_values = 0;
 
   for (unsigned i=0; i<num_var; i++) {
      jbuf[i]->Finish();
      num_values += jbuf[i]->fValues.size();
   }
 
   // NB: beware of 32-bit integer overflow. all values are now 64-bit size_t, overflow should not happen.
   size_t p0_size = sizeof(double)*(2+2*num_var+2*num_values);
 
   size_t size_limit = 1000*1024*1024;
 
   if (p0_size > size_limit) {
      cm_msg(MERROR, "js_hs_read_binned_arraybuffer", "Refusing to return %zu bytes of history data, limit is %zu bytes\n", p0_size, size_limit);
 
      for (size_t i=0; i<num_var; i++) {
         delete jbuf[i];
         jbuf[i] = NULL;
         buf[i] = NULL;
      }
      
      delete[] event_name;
      delete[] tag_name;
      delete[] var_index;
      delete[] buf;
      delete[] jbuf;
      delete[] hs_status;
      
      return mjsonrpc_make_error(-32603, "Internal error", "Too much history data");
   }
 
   double* p0 = (double*)malloc(p0_size);
 
   if (p0 == NULL) {
      cm_msg(MERROR, "js_hs_read_binned_arraybuffer", "Cannot allocate return buffer %d bytes\n", int(p0_size));
      
      for (size_t i=0; i<num_var; i++) {
         delete jbuf[i];
         jbuf[i] = NULL;
         buf[i] = NULL;
      }
      
      delete[] event_name;
      delete[] tag_name;
      delete[] var_index;
      delete[] buf;
      delete[] jbuf;
      delete[] hs_status;
      
      return mjsonrpc_make_error(-32603, "Internal error", "Cannot allocate buffer, too much data");
   }
 
   double *pptr = p0;
   
   //
   // Binary data format:
   //
   // - hs_read() status
   // - num_var
   // - hs_status[0..num_var-1]
   // - num_values[0..num_var-1]
   // - data for var0:
   // - t[0][0], v[0][0] ... t[0][num_values[0]-1], v[0][num_values[0]-1]
   // - data for var1:
   // - t[1][0], v[1][0] ... t[1][num_values[1]-1], v[1][num_values[1]-1]
   // ...
   // - data for last variable:
   // - t[num_var-1][0], v[num_var-1][0] ... t[num_var-1][num_values[num_var-1]-1], v[num_var-1][num_values[num_var-1]-1]
   //
 
   *pptr++ = status;
   *pptr++ = num_var;
 
   for (size_t i=0; i<num_var; i++) {
      *pptr++ = hs_status[i];
   }
 
   for (size_t i=0; i<num_var; i++) {
      *pptr++ = jbuf[i]->fValues.size();
   }
 
   for (size_t i=0; i<num_var; i++) {
      size_t nv = jbuf[i]->fValues.size();
      for (size_t j=0; j<nv; j++) {
         *pptr++ = jbuf[i]->fTimes[j];
         *pptr++ = jbuf[i]->fValues[j];
      }
 
      delete jbuf[i];
      jbuf[i] = NULL;
      buf[i] = NULL;
   }
 
   //printf("p0_size %d, %d/%d\n", (int)p0_size, (int)(pptr-p0), (int)((pptr-p0)*sizeof(double)));
 
   assert(p0_size == ((pptr-p0)*sizeof(double)));
 
   delete[] event_name;
   delete[] tag_name;
   delete[] var_index;
   delete[] buf;
   delete[] jbuf;
   delete[] hs_status;
 
   MJsonNode* result = MJsonNode::MakeArrayBuffer((char*)p0, p0_size);
 
   return result;
}
 
static MJsonNode* js_hs_read_binned_arraybuffer(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get history data for given history events that existed at give time using hs_read_buffer()");
      doc->P("channel?", MJSON_STRING, "midas history channel, default is the default reader channel");
      doc->P("start_time", MJSON_NUMBER, "start time of the data");
      doc->P("end_time", MJSON_NUMBER, "end time of the data");
      doc->P("num_bins", MJSON_INT, "number of time bins");
      doc->P("events[]", MJSON_STRING, "array of history event names");
      doc->P("tags[]", MJSON_STRING, "array of history event tag names");
      doc->P("index[]", MJSON_STRING, "array of history event tag array indices");
      doc->R("binary data", MJSON_ARRAYBUFFER, "binary data, see documentation");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string channel = mjsonrpc_get_param(params, "channel", NULL)->GetString();
   double start_time = mjsonrpc_get_param(params, "start_time", &error)->GetDouble(); if (error) return error;
   double end_time = mjsonrpc_get_param(params, "end_time", &error)->GetDouble(); if (error) return error;
   int inum_bins = mjsonrpc_get_param(params, "num_bins", &error)->GetInt(); if (error) return error;
 
   if (inum_bins < 1) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Value of num_bins should be 1 or more");
   }
 
   size_t num_bins = inum_bins;
 
   const MJsonNodeVector* events_array = mjsonrpc_get_param_array(params, "events", NULL);
   const MJsonNodeVector* tags_array = mjsonrpc_get_param_array(params, "tags", NULL);
   const MJsonNodeVector* index_array = mjsonrpc_get_param_array(params, "index", NULL);
 
   MidasHistoryInterface* mh = GetHistory(channel.c_str());
 
   if (!mh) {
      int status = HS_FILE_ERROR;
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   size_t num_var = events_array->size();
 
   if (num_var < 1) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Array of events should have 1 or more elements");
   }
 
   if (tags_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and tags should have the same length");
   }
 
   if (index_array->size() != num_var) {
      return mjsonrpc_make_error(-32602, "Invalid params", "Arrays events and index should have the same length");
   }
   
   std::vector<std::string> event_names(num_var);
   std::vector<std::string> tag_names(num_var);
   //const char** event_name = new const char*[num_var];
   //const char** tag_name = new const char*[num_var];
   int* var_index = new int[num_var];
 
   int* num_entries = new int[num_var];
   time_t* last_time = new time_t[num_var];
   double* last_value = new double[num_var];
   int* hs_status = new int[num_var];
 
   int** count_bins = new int*[num_var];
   double** mean_bins = new double*[num_var];
   double** rms_bins = new double*[num_var];
   double** min_bins = new double*[num_var];
   double** max_bins = new double*[num_var];
 
   time_t** bins_first_time = new time_t*[num_var];
   time_t** bins_last_time  = new time_t*[num_var];
 
   double** bins_first_value = new double*[num_var];
   double** bins_last_value  = new double*[num_var];
 
   for (unsigned i=0; i<num_var; i++) {
      //event_name[i] = (*events_array)[i]->GetString().c_str();
      //tag_name[i] = (*tags_array)[i]->GetString().c_str();
      event_names[i] = (*events_array)[i]->GetString();
      tag_names[i] = (*tags_array)[i]->GetString();
      var_index[i] = (*index_array)[i]->GetInt();
      num_entries[i] = 0;
      last_time[i] = 0;
      last_value[i] = 0;
      hs_status[i] = 0;
      count_bins[i] = new int[num_bins];
      mean_bins[i] = new double[num_bins];
      rms_bins[i] = new double[num_bins];
      min_bins[i] = new double[num_bins];
      max_bins[i] = new double[num_bins];
      bins_first_time[i] = new time_t[num_bins];
      bins_last_time[i] = new time_t[num_bins];
      bins_first_value[i] = new double[num_bins];
      bins_last_value[i] = new double[num_bins];
   }
 
   if (/* DISABLES CODE */ (0)) {
      printf("time %f %f, num_vars %d:\n", start_time, end_time, int(num_var));
      for (size_t i=0; i<num_var; i++) {
         printf("%d: [%s] [%s] [%d]\n", int(i), event_names[i].c_str(), tag_names[i].c_str(), var_index[i]);
      }
   }
 
   const char** event_name = new const char*[num_var];
   const char** tag_name = new const char*[num_var];
   for (size_t i=0; i<num_var; i++) {
      event_name[i] = event_names[i].c_str();
      tag_name[i] = tag_names[i].c_str();
   }
 
   int status = mh->hs_read_binned(start_time, end_time, num_bins, num_var, event_name, tag_name, var_index, num_entries, count_bins, mean_bins, rms_bins, min_bins, max_bins, bins_first_time, bins_first_value, bins_last_time, bins_last_value, last_time, last_value, hs_status);
 
   // NB: beware of 32-bit integer overflow: all variables are now 64-bit size_t, overflow should not happen
   size_t p0_size = sizeof(double)*(5+4*num_var+9*num_var*num_bins);
 
   size_t size_limit = 100*1024*1024;
 
   if (p0_size > size_limit) {
      cm_msg(MERROR, "js_hs_read_binned_arraybuffer", "Refusing to return %d bytes. limit is %d bytes\n", int(p0_size), int(size_limit));
 
      for (size_t i=0; i<num_var; i++) {
         delete count_bins[i];
         delete mean_bins[i];
         delete rms_bins[i];
         delete min_bins[i];
         delete max_bins[i];
         delete bins_first_time[i];
         delete bins_first_value[i];
         delete bins_last_time[i];
         delete bins_last_value[i];
      }
 
      delete[] count_bins;
      delete[] mean_bins;
      delete[] rms_bins;
      delete[] min_bins;
      delete[] max_bins;
      
      delete[] bins_first_time;
      delete[] bins_first_value;
      delete[] bins_last_time;
      delete[] bins_last_value;
      
      delete[] event_name;
      delete[] tag_name;
      delete[] var_index;
      
      delete[] num_entries;
      delete[] last_time;
      delete[] last_value;
      delete[] hs_status;
 
      return mjsonrpc_make_error(-32603, "Internal error", "Refuse to return too much data");
   }
 
   double* p0 = (double*)malloc(p0_size);
 
   if (p0 == NULL) {
      cm_msg(MERROR, "js_hs_read_binned_arraybuffer", "Cannot allocate return buffer %d bytes\n", int(p0_size));
 
      for (size_t i=0; i<num_var; i++) {
         delete count_bins[i];
         delete mean_bins[i];
         delete rms_bins[i];
         delete min_bins[i];
         delete max_bins[i];
         delete bins_first_time[i];
         delete bins_first_value[i];
         delete bins_last_time[i];
         delete bins_last_value[i];
      }
 
      delete[] count_bins;
      delete[] mean_bins;
      delete[] rms_bins;
      delete[] min_bins;
      delete[] max_bins;
 
      delete[] bins_first_time;
      delete[] bins_first_value;
      delete[] bins_last_time;
      delete[] bins_last_value;
      
      delete[] event_name;
      delete[] tag_name;
      delete[] var_index;
      
      delete[] num_entries;
      delete[] last_time;
      delete[] last_value;
      delete[] hs_status;
 
      return mjsonrpc_make_error(-32603, "Internal error", "Cannot allocate buffer, too much data");
   }
 
   double *pptr = p0;
   
   //
   // Binary data format:
   //
   // * header
   // -- hs_read() status
   // -- start_time
   // -- end_time
   // -- num_bins
   // -- num_var
   // * per variable info
   // -- hs_status[0..num_var-1]
   // -- num_entries[0..num_var-1]
   // -- last_time[0..num_var-1]
   // -- last_value[0..num_var-1]
   // * data for var0 bin0
   // -- count - number of entries in this bin
   // -- mean - mean value
   // -- rms - rms value
   // -- min - minimum value
   // -- max - maximum value
   // -- bins_first_time - first data point in each bin
   // -- bins_first_value
   // -- bins_last_time - last data point in each bin
   // -- bins_last_value
   // - data for var0 bin1
   // - ... bin[num_bins-1]
   // - data for var1 bin0
   // - ...
   // - data for var[num_vars-1] bin[0]
   // - ...
   // - data for var[num_vars-1] bin[num_bins-1]
   //
 
   *pptr++ = status;
   *pptr++ = start_time;
   *pptr++ = end_time;
   *pptr++ = num_bins;
   *pptr++ = num_var;
 
   for (unsigned i=0; i<num_var; i++) {
      *pptr++ = hs_status[i];
   }
 
   for (unsigned i=0; i<num_var; i++) {
      *pptr++ = num_entries[i];
   }
 
   for (unsigned i=0; i<num_var; i++) {
      *pptr++ = last_time[i];
   }
 
   for (unsigned i=0; i<num_var; i++) {
      *pptr++ = last_value[i];
   }
 
   for (size_t i=0; i<num_var; i++) {
      for (size_t j=0; j<num_bins; j++) {
         *pptr++ = count_bins[i][j];
         *pptr++ = mean_bins[i][j];
         *pptr++ = rms_bins[i][j];
         *pptr++ = min_bins[i][j];
         *pptr++ = max_bins[i][j];
         *pptr++ = bins_first_time[i][j];
         *pptr++ = bins_first_value[i][j];
         *pptr++ = bins_last_time[i][j];
         *pptr++ = bins_last_value[i][j];
      }
 
      delete count_bins[i];
      delete mean_bins[i];
      delete rms_bins[i];
      delete min_bins[i];
      delete max_bins[i];
      delete bins_first_time[i];
      delete bins_first_value[i];
      delete bins_last_time[i];
      delete bins_last_value[i];
   }
 
   //printf("p0_size %d, %d/%d\n", (int)p0_size, (int)(pptr-p0), (int)((pptr-p0)*sizeof(double)));
 
   assert(p0_size == ((pptr-p0)*sizeof(double)));
 
   delete[] count_bins;
   delete[] mean_bins;
   delete[] rms_bins;
   delete[] min_bins;
   delete[] max_bins;
 
   delete[] bins_first_time;
   delete[] bins_first_value;
   delete[] bins_last_time;
   delete[] bins_last_value;
 
   delete[] event_name;
   delete[] tag_name;
   delete[] var_index;
 
   delete[] num_entries;
   delete[] last_time;
   delete[] last_value;
   delete[] hs_status;
 
   MJsonNode* result = MJsonNode::MakeArrayBuffer((char*)p0, p0_size);
 
   return result;
}
 
//
// image history code goes here
//
 
static MJsonNode* js_hs_image_retrieve(const MJsonNode* params) {
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("Get a list of history image files");
      doc->P("image?", MJSON_STRING, "image name as defined under /History/Images/<image>");
      doc->P("start_time", MJSON_NUMBER, "start time of the data");
      doc->P("end_time", MJSON_NUMBER, "end time of the data");
      doc->R("time[]", MJSON_ARRAYBUFFER, "array of time stamps in seconds");
      doc->R("filename[]", MJSON_ARRAYBUFFER, "array of file names");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string image = mjsonrpc_get_param(params, "image", NULL)->GetString();
   double start_time = mjsonrpc_get_param(params, "start_time", &error)->GetDouble(); if (error) return error;
   double end_time = mjsonrpc_get_param(params, "end_time", &error)->GetDouble(); if (error) return error;
 
   std::vector<time_t>vtime{};
   std::vector<std::string>vfilename{};
 
   int status = hs_image_retrieve(image, start_time, end_time, vtime, vfilename);
   int count = 10;
   MJsonNode *tj = MJsonNode::MakeArray();
   MJsonNode *fj = MJsonNode::MakeArray();
 
   for (int i=0 ; i<(int)vtime.size() ; i++) {
      tj->AddToArray(MJsonNode::MakeInt(vtime[i]));
      ss_repair_utf8(vfilename[i]);
      fj->AddToArray(MJsonNode::MakeString(vfilename[i].c_str()));
   }
   MJsonNode* data = MJsonNode::MakeObject();
   data->AddToObject("count", MJsonNode::MakeInt(count));
   data->AddToObject("time", tj);
   data->AddToObject("filename", fj);
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "data", data);
}
 
//
// elog code goes here
//
 
static MJsonNode* js_el_retrieve(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Get an elog message");
      doc->P("tag", MJSON_STRING, "elog message tag");
      doc->R("status", MJSON_INT, "return status of el_retrieve");
      doc->R("msg.tag", MJSON_STRING, "message tag");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string tag = mjsonrpc_get_param(params, "tag", &error)->GetString(); if (error) return error;
 
   int run = 0;
   char date[80], author[80], type[80], system[80], subject[256], text[10000];
   char orig_tag[80], reply_tag[80], attachment[3][256], encoding[80];
 
   char xtag[80];
   mstrlcpy(xtag, tag.c_str(), sizeof(xtag));
 
   int size = sizeof(text);
 
   int status = el_retrieve(xtag,
                            date, &run, author, type, system, subject,
                            text, &size, orig_tag, reply_tag,
                            attachment[0], attachment[1], attachment[2], encoding);
 
   //printf("js_el_retrieve: size %d, status %d, tag [%s]\n", size, status, xtag);
 
   MJsonNode* msg = MJsonNode::MakeObject();
 
   if (status == EL_SUCCESS) {
      ss_repair_utf8(xtag);
      msg->AddToObject("tag", MJsonNode::MakeString(xtag));
      ss_repair_utf8(date);
      msg->AddToObject("date", MJsonNode::MakeString(date));
      msg->AddToObject("run", MJsonNode::MakeInt(run));
      ss_repair_utf8(author);
      msg->AddToObject("author", MJsonNode::MakeString(author));
      ss_repair_utf8(type);
      msg->AddToObject("type", MJsonNode::MakeString(type));
      ss_repair_utf8(system);
      msg->AddToObject("system", MJsonNode::MakeString(system));
      ss_repair_utf8(subject);
      msg->AddToObject("subject", MJsonNode::MakeString(subject));
      ss_repair_utf8(text);
      msg->AddToObject("text", MJsonNode::MakeString(text));
      ss_repair_utf8(orig_tag);
      msg->AddToObject("orig_tag", MJsonNode::MakeString(orig_tag));
      ss_repair_utf8(reply_tag);
      msg->AddToObject("reply_tag", MJsonNode::MakeString(reply_tag));
      ss_repair_utf8(attachment[0]);
      msg->AddToObject("attachment0", MJsonNode::MakeString(attachment[0]));
      ss_repair_utf8(attachment[1]);
      msg->AddToObject("attachment1", MJsonNode::MakeString(attachment[1]));
      ss_repair_utf8(attachment[2]);
      msg->AddToObject("attachment2", MJsonNode::MakeString(attachment[2]));
      ss_repair_utf8(encoding);
      msg->AddToObject("encoding", MJsonNode::MakeString(encoding));
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "msg", msg);
}
 
static MJsonNode* js_el_query(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Query elog messages");
      doc->P("last_n_hours?", MJSON_INT, "return messages from the last N hours");
      doc->R("status", MJSON_INT, "return status of el_retrieve");
      doc->R("msg[].tag", MJSON_STRING, "message tag");
      return doc;
   }
 
   //MJsonNode* error = NULL;
 
   //int last_n = mjsonrpc_get_param(params, "last_n_hours", &error)->GetInt(); if (error) return error;
   int last_n = mjsonrpc_get_param(params, "last_n_hours", NULL)->GetInt();
 
   std::string pd1 = mjsonrpc_get_param(params, "d1", NULL)->GetString();
   std::string pm1 = mjsonrpc_get_param(params, "m1", NULL)->GetString();
   std::string py1 = mjsonrpc_get_param(params, "y1", NULL)->GetString();
 
   std::string pd2 = mjsonrpc_get_param(params, "d2", NULL)->GetString();
   std::string pm2 = mjsonrpc_get_param(params, "m2", NULL)->GetString();
   std::string py2 = mjsonrpc_get_param(params, "y2", NULL)->GetString();
 
   std::string pr1 = mjsonrpc_get_param(params, "r1", NULL)->GetString();
   std::string pr2 = mjsonrpc_get_param(params, "r2", NULL)->GetString();
 
   std::string ptype = mjsonrpc_get_param(params, "type", NULL)->GetString();
   std::string psystem = mjsonrpc_get_param(params, "system", NULL)->GetString();
   std::string pauthor = mjsonrpc_get_param(params, "author", NULL)->GetString();
   std::string psubject = mjsonrpc_get_param(params, "subject", NULL)->GetString();
   std::string psubtext = mjsonrpc_get_param(params, "subtext", NULL)->GetString();
 
   MJsonNode* msg_array = MJsonNode::MakeArray();
 
   int i, size, run, status;
   char date[80], author[80], type[80], system[80], subject[256], text[10000],
       orig_tag[80], reply_tag[80], attachment[3][256], encoding[80];
   char str[256], str2[10000], tag[256];
   struct tm tms;
 
   // month name from midas.c
   extern const char *mname[];
 
   /*---- convert end date to ltime ----*/
 
   int y1 = -1;
   int m1 = -1;
   int d1 = -1;
 
   int y2 = -1;
   int m2 = -1;
   int d2 = -1;
 
   int r1 = -1;
   int r2 = -1;
 
   if (pr1.length()>0)
      r1 = atoi(pr1.c_str());
 
   if (pr2.length()>0)
      r2 = atoi(pr2.c_str());
   
   time_t ltime_start = 0;
   time_t ltime_end = 0;
 
   if (!last_n) {
      // decode starting date year, day and month
      
      if (py1.length() > 0)
         y1 = atoi(py1.c_str());
 
      if (pd1.length() > 0)
         d1 = atoi(pd1.c_str());
 
      mstrlcpy(str, pm1.c_str(), sizeof(str));
      for (m1 = 0; m1 < 12; m1++)
         if (equal_ustring(str, mname[m1]))
            break;
      if (m1 == 12)
         m1 = 0;
 
      if (pd2.length() > 0) {
         d2 = atoi(pd2.c_str());
      }
         
      if (py2.length() > 0) {
         // decode ending date year, day and month
 
         mstrlcpy(str, pm2.c_str(), sizeof(str));
         for (m2 = 0; m2 < 12; m2++)
            if (equal_ustring(str, mname[m2]))
               break;
         if (m2 == 12) {
            m2 = 0;
         }
      }
 
      if (py2.length() > 0) {
         y2 = atoi(py2.c_str());
      }
 
      if (y2>=0 && m2>=0 && d2>=0) {
         memset(&tms, 0, sizeof(struct tm));
         tms.tm_year = y2 % 100;
         tms.tm_mon = m2;
         tms.tm_mday = d2;
         tms.tm_hour = 24;
         
         if (tms.tm_year < 90)
            tms.tm_year += 100;
         ltime_end = ss_mktime(&tms);
      }
   }
 
   /*---- do query ----*/
 
   tag[0] = 0;
 
   if (last_n) {
      ss_tzset(); // required for localtime_r()
      time_t now = time(NULL);
      ltime_start = now - 3600 * last_n;
      struct tm tms;
      localtime_r(&ltime_start, &tms);
      sprintf(tag, "%02d%02d%02d.0", tms.tm_year % 100, tms.tm_mon + 1, tms.tm_mday);
   } else if (r1 > 0) {
      /* do run query */
      el_search_run(r1, tag);
   } else if (y1>=0 && m1>=0 && d1>=0) {
      /* do date-date query */
      sprintf(tag, "%02d%02d%02d.0", y1 % 100, m1 + 1, d1);
   }
 
#if 0
   printf("js_el_query: y1 %d, m1 %d, d1 %d, y2 %d, m2 %d, d2 %d, r1 %d, r2 %d, last_n_hours %d, start time %lu, end time %lu, tag [%s]\n",
          y1, m1, d1,
          y2, m2, d2,
          r1, r2,
          last_n,
          ltime_start,
          ltime_end,
          tag);
#endif
 
   do {
      size = sizeof(text);
      status = el_retrieve(tag, date, &run, author, type, system, subject,
                           text, &size, orig_tag, reply_tag,
                           attachment[0], attachment[1], attachment[2], encoding);
 
      std::string this_tag = tag;
 
      //printf("js_el_query: el_retrieve: size %d, status %d, tag [%s], run %d, tags [%s] [%s]\n", size, status, tag, run, orig_tag, reply_tag);
      
      mstrlcat(tag, "+1", sizeof(tag));
 
      /* check for end run */
      if ((r2 > 0) && (r2 < run)) {
         break;
      }
 
      /* convert date to unix format */
      memset(&tms, 0, sizeof(struct tm));
      tms.tm_year = (tag[0] - '0') * 10 + (tag[1] - '0');
      tms.tm_mon = (tag[2] - '0') * 10 + (tag[3] - '0') - 1;
      tms.tm_mday = (tag[4] - '0') * 10 + (tag[5] - '0');
      tms.tm_hour = (date[11] - '0') * 10 + (date[12] - '0');
      tms.tm_min = (date[14] - '0') * 10 + (date[15] - '0');
      tms.tm_sec = (date[17] - '0') * 10 + (date[18] - '0');
 
      if (tms.tm_year < 90)
         tms.tm_year += 100;
 
      time_t ltime_current = ss_mktime(&tms);
 
      //printf("js_el_query: ltime: start %ld, end %ld, current %ld\n", ltime_start, ltime_end, ltime_current);
 
      /* check for start date */
      if (ltime_start > 0)
         if (ltime_current < ltime_start)
            continue;
 
      /* check for end date */
      if (ltime_end > 0) {
         if (ltime_current > ltime_end)
            break;
      }
 
      if (status == EL_SUCCESS) {
         /* do filtering */
         if ((ptype.length()>0) && !equal_ustring(ptype.c_str(), type))
            continue;
         if ((psystem.length()>0) && !equal_ustring(psystem.c_str(), system))
            continue;
 
         if (pauthor.length()>0) {
            mstrlcpy(str, pauthor.c_str(), sizeof(str));
            for (i = 0; i < (int) strlen(str); i++)
               str[i] = toupper(str[i]);
            str[i] = 0;
            for (i = 0; i < (int) strlen(author) && author[i] != '@'; i++)
               str2[i] = toupper(author[i]);
            str2[i] = 0;
 
            if (strstr(str2, str) == NULL)
               continue;
         }
 
         if (psubject.length()>0) {
            mstrlcpy(str, psubject.c_str(), sizeof(str));
            for (i = 0; i < (int) strlen(str); i++)
               str[i] = toupper(str[i]);
            str[i] = 0;
            for (i = 0; i < (int) strlen(subject); i++)
               str2[i] = toupper(subject[i]);
            str2[i] = 0;
 
            if (strstr(str2, str) == NULL)
               continue;
         }
 
         if (psubtext.length()>0) {
            mstrlcpy(str, psubtext.c_str(), sizeof(str));
            for (i = 0; i < (int) strlen(str); i++)
               str[i] = toupper(str[i]);
            str[i] = 0;
            for (i = 0; i < (int) strlen(text); i++)
               str2[i] = toupper(text[i]);
            str2[i] = 0;
 
            if (strstr(str2, str) == NULL)
               continue;
         }
 
         /* filter passed: display line */
 
         MJsonNode* msg = MJsonNode::MakeObject();
         
         ss_repair_utf8(this_tag);
         msg->AddToObject("tag", MJsonNode::MakeString(this_tag.c_str()));
         ss_repair_utf8(date);
         msg->AddToObject("date", MJsonNode::MakeString(date));
         msg->AddToObject("run", MJsonNode::MakeInt(run));
         ss_repair_utf8(author);
         msg->AddToObject("author", MJsonNode::MakeString(author));
         ss_repair_utf8(type);
         msg->AddToObject("type", MJsonNode::MakeString(type));
         ss_repair_utf8(system);
         msg->AddToObject("system", MJsonNode::MakeString(system));
         ss_repair_utf8(subject);
         msg->AddToObject("subject", MJsonNode::MakeString(subject));
         ss_repair_utf8(text);
         msg->AddToObject("text", MJsonNode::MakeString(text));
         ss_repair_utf8(orig_tag);
         msg->AddToObject("orig_tag", MJsonNode::MakeString(orig_tag));
         ss_repair_utf8(reply_tag);
         msg->AddToObject("reply_tag", MJsonNode::MakeString(reply_tag));
         ss_repair_utf8(attachment[0]);
         msg->AddToObject("attachment0", MJsonNode::MakeString(attachment[0]));
         ss_repair_utf8(attachment[1]);
         msg->AddToObject("attachment1", MJsonNode::MakeString(attachment[1]));
         ss_repair_utf8(attachment[2]);
         msg->AddToObject("attachment2", MJsonNode::MakeString(attachment[2]));
         ss_repair_utf8(encoding);
         msg->AddToObject("encoding", MJsonNode::MakeString(encoding));
 
         msg_array->AddToArray(msg);
      }
 
   } while (status == EL_SUCCESS);
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "msg", msg_array);
}
 
static MJsonNode* js_el_delete(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Delete elog message");
      doc->P("tag", MJSON_STRING, "tag of message to delete");
      doc->R("status", MJSON_INT, "return status of el_delete");
      return doc;
   }
 
   MJsonNode* error = NULL;
   std::string tag = mjsonrpc_get_param(params, "tag", &error)->GetString(); if (error) return error;
   int status = el_delete_message(tag.c_str());
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
}
 
   
//
// jrpc code goes here
//
 
static MJsonNode* jrpc(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("make RPC call into frontend program via RPC_JRPC");
      doc->P("client_name", MJSON_STRING, "Connect to this MIDAS client, see cm_connect_client()");
      doc->P("cmd", MJSON_STRING, "Command passed to client");
      doc->P("args", MJSON_STRING, "Parameters passed to client as a string, could be JSON encoded");
      doc->P("max_reply_length?", MJSON_INT, "Optional maximum length of client reply. MIDAS RPC does not support returning strings of arbitrary length, maximum length has to be known ahead of time.");
      doc->R("reply", MJSON_STRING, "Reply from client as a string, could be JSON encoded");
      doc->R("status", MJSON_INT, "return status of cm_connect_client() and rpc_client_call()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string name   = mjsonrpc_get_param(params, "client_name", &error)->GetString(); if (error) return error;
   std::string cmd    = mjsonrpc_get_param(params, "cmd", &error)->GetString(); if (error) return error;
   std::string args   = mjsonrpc_get_param(params, "args", &error)->GetString(); if (error) return error;
   int max_reply_length = mjsonrpc_get_param(params, "max_reply_length", NULL)->GetInt();
 
   int status;
 
   int buf_length = 1024;
 
   if (max_reply_length > buf_length)
      buf_length = max_reply_length;
 
   char* buf = (char*)malloc(buf_length);
   buf[0] = 0;
 
   HNDLE hconn;
 
   status = cm_connect_client(name.c_str(), &hconn);
 
   if (status != RPC_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   status = rpc_client_call(hconn, RPC_JRPC, cmd.c_str(), args.c_str(), buf, buf_length);
 
   // disconnect return status ignored on purpose.
   // disconnect not needed, there is no limit on number
   // of connections. dead and closed connections are reaped
   // automatically. K.O. Feb 2021.
   // cm_disconnect_client(hconn, FALSE);
 
   if (status != RPC_SUCCESS) {
      free(buf);
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   ss_repair_utf8(buf);
   MJsonNode* reply = MJsonNode::MakeString(buf);
   free(buf);
   
   return mjsonrpc_make_result("reply", reply, "status", MJsonNode::MakeInt(SUCCESS));
}
 
//
// brpc code goes here
//
 
static MJsonNode* brpc(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("make RPC call into frontend program via RPC_BRPC");
      doc->P("client_name", MJSON_STRING, "Connect to this MIDAS client, see cm_connect_client()");
      doc->P("cmd", MJSON_STRING, "Command passed to client");
      doc->P("args", MJSON_STRING, "Parameters passed to client as a string, could be JSON encoded");
      doc->P("max_reply_length?", MJSON_INT, "Optional maximum length of client reply. MIDAS RPC does not support returning data of arbitrary length, maximum length has to be known ahead of time.");
      doc->R("reply", MJSON_STRING, "Reply from client as a string, could be JSON encoded");
      doc->R("status", MJSON_INT, "return status of cm_connect_client() and rpc_client_call()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string name   = mjsonrpc_get_param(params, "client_name", &error)->GetString(); if (error) return error;
   std::string cmd    = mjsonrpc_get_param(params, "cmd", &error)->GetString(); if (error) return error;
   std::string args   = mjsonrpc_get_param(params, "args", &error)->GetString(); if (error) return error;
   int max_reply_length = mjsonrpc_get_param(params, "max_reply_length", NULL)->GetInt();
 
   int status;
 
   int buf_length = 1024;
 
   if (max_reply_length > buf_length)
      buf_length = max_reply_length;
 
   char* buf = (char*)malloc(buf_length);
   buf[0] = 0;
 
   HNDLE hconn;
 
   status = cm_connect_client(name.c_str(), &hconn);
 
   if (status != RPC_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   status = rpc_client_call(hconn, RPC_BRPC, cmd.c_str(), args.c_str(), buf, &buf_length);
 
   // disconnect return status ignored on purpose.
   // disconnect not needed, there is no limit on number
   // of connections. dead and closed connections are reaped
   // automatically. K.O. Feb 2021.
   // cm_disconnect_client(hconn, FALSE);
 
   if (status != RPC_SUCCESS) {
      free(buf);
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   return MJsonNode::MakeArrayBuffer(buf, buf_length);
}
 
//
// Run transition code goes here
//
 
static MJsonNode* js_cm_transition(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("start and stop runs");
      doc->P("transition", MJSON_STRING, "requested transition: TR_START, TR_STOP, TR_PAUSE, TR_RESUME");
      doc->P("run_number?", MJSON_INT, "New run number, value 0 means /runinfo/run_number + 1, default is 0");
      doc->P("async_flag?", MJSON_INT, "Transition type. Default is multithreaded transition TR_MTHREAD");
      doc->P("debug_flag?", MJSON_INT, "See cm_transition(), value 1: trace to stdout, value 2: trace to midas.log");
      doc->R("status", MJSON_INT, "return status of cm_transition()");
      doc->R("error_string?", MJSON_STRING, "return error string from cm_transition()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string xtransition = mjsonrpc_get_param(params, "transition", &error)->GetString(); if (error) return error;
   int run_number = mjsonrpc_get_param(params, "run_number", NULL)->GetInt();
   int async_flag = mjsonrpc_get_param(params, "async_flag", NULL)->GetInt();
   int debug_flag = mjsonrpc_get_param(params, "debug_flag", NULL)->GetInt();
 
   int status;
 
   int transition = 0;
 
   if (xtransition == "TR_START")
      transition = TR_START;
   else if (xtransition == "TR_STOP")
      transition = TR_STOP;
   else if (xtransition == "TR_PAUSE")
      transition = TR_PAUSE;
   else if (xtransition == "TR_RESUME")
      transition = TR_RESUME;
   else {
      return mjsonrpc_make_error(15, "invalid value of \"transition\"", xtransition.c_str());
   }
 
   if (async_flag == 0)
      async_flag = TR_MTHREAD;
 
   char error_str[1024];
   
   status = cm_transition(transition, run_number, error_str, sizeof(error_str), async_flag, debug_flag);
 
   MJsonNode* result = MJsonNode::MakeObject();
 
   result->AddToObject("status", MJsonNode::MakeInt(status));
   if (strlen(error_str) > 0) {
      ss_repair_utf8(error_str);
      result->AddToObject("error_string", MJsonNode::MakeString(error_str));
   }
   return mjsonrpc_make_result(result);
}
 
//
// Event buffer code goes here
//
 
static const EVENT_HEADER* CopyEvent(const EVENT_HEADER* pevent)
{
   size_t event_size = sizeof(EVENT_HEADER) + pevent->data_size;
   //size_t total_size = ALIGN8(event_size);
   EVENT_HEADER* ptr = (EVENT_HEADER*)malloc(event_size);
   assert(ptr);
   memcpy(ptr, pevent, event_size);
   return ptr;
}
 
struct EventStashEntry
{
   std::string buffer_name;
   int event_id = 0;
   int trigger_mask = 0;
   const EVENT_HEADER* pevent = NULL;
 
   ~EventStashEntry() // dtor
   {
      //Print(); printf(", dtor!\n");
      buffer_name.clear();
      event_id = 0;
      trigger_mask = 0;
      if (pevent)
         free((void*)pevent);
      pevent = NULL;
   }
 
   void ReplaceEvent(const EVENT_HEADER* xpevent)
   {
      if (pevent) {
         free((void*)pevent);
         pevent = NULL;
      }
      pevent = CopyEvent(xpevent);
   }
 
   void Print() const
   {
      printf("EventStashEntry: %s,%d,0x%x,%p", buffer_name.c_str(), event_id, trigger_mask, pevent);
      if (pevent)
         printf(", size %d, serial %d, time %d, event_id %d, trigger_mask %x", pevent->data_size, pevent->serial_number, pevent->time_stamp, pevent->event_id, pevent->trigger_mask);
   }
};
 
static std::mutex gEventStashMutex;
static std::vector<EventStashEntry*> gEventStash;
 
static void StashEvent(const std::string buffer_name, int event_id, int trigger_mask, const EVENT_HEADER* pevent)
{
   std::lock_guard<std::mutex> guard(gEventStashMutex);
   bool found = false;
   for (EventStashEntry* s : gEventStash) {
      if (s->buffer_name != buffer_name)
         continue;
      if (s->event_id == event_id && s->trigger_mask == trigger_mask) {
         found = true;
         s->ReplaceEvent(pevent);
         //s->Print(); printf(", replaced\n");
      } else if (bm_match_event(s->event_id, s->trigger_mask, pevent)) {
         s->ReplaceEvent(pevent);
         //s->Print(); printf(", matched\n");
      }
   }
   if (!found) {
      EventStashEntry* s = new EventStashEntry();
      s->buffer_name = buffer_name;
      s->event_id = event_id;
      s->trigger_mask = trigger_mask;
      s->pevent = CopyEvent(pevent);
      //s->Print(); printf(", added\n");
      gEventStash.push_back(s);
   }
}
 
static void MatchEvent(const std::string buffer_name, const EVENT_HEADER* pevent)
{
   std::lock_guard<std::mutex> guard(gEventStashMutex);
   for (EventStashEntry* s : gEventStash) {
      if (s->buffer_name != buffer_name)
         continue;
      if (bm_match_event(s->event_id, s->trigger_mask, pevent)) {
         s->ReplaceEvent(pevent);
         //s->Print(); printf(", matched\n");
      }
   }
}
 
static void DeleteEventStash()
{
   std::lock_guard<std::mutex> guard(gEventStashMutex);
   for (size_t i=0; i<gEventStash.size(); i++) {
      if (gEventStash[i]) {
         delete gEventStash[i];
         gEventStash[i] = NULL;
      }
   }
}
 
static const EVENT_HEADER* FindEvent(const std::string buffer_name, int event_id, int trigger_mask, int last_event_id, int last_trigger_mask, DWORD last_serial_number, DWORD last_time_stamp)
{
   std::lock_guard<std::mutex> guard(gEventStashMutex);
   for (EventStashEntry* s : gEventStash) {
      if (s->buffer_name != buffer_name)
         continue;
      if (bm_match_event(event_id, trigger_mask, s->pevent)) {
         if (s->pevent->event_id == last_event_id
             && s->pevent->trigger_mask == last_trigger_mask
             && s->pevent->serial_number == last_serial_number
             && s->pevent->time_stamp == last_time_stamp) {
            //s->Print(); printf(", already sent for %d,0x%x\n", event_id, trigger_mask);
            return NULL;
         } else {
            //s->Print(); printf(", serving for %d,0x%x\n", event_id, trigger_mask);
            return CopyEvent(s->pevent);
         }
      }
   }
   return NULL;
}
 
static MJsonNode* js_bm_receive_event(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("read event buffers");
      doc->P("buffer_name", MJSON_STRING, "name of event buffer");
      doc->P("event_id?", MJSON_INT, "requested event id, -1 means any event id");
      doc->P("trigger_mask?", MJSON_INT, "requested trigger mask, -1 means any trigger mask");
      doc->P("get_recent?", MJSON_BOOL, "get last available event that matches this event request");
      doc->P("last_event_header[]?", MJSON_INT, "do not resend an event we already received: event header of last received event [event_id,trigger_mask,serial_number,time_stamp]");
      doc->P("timeout_millisec?", MJSON_NUMBER, "how long to wait for an event");
      doc->R("binary data", MJSON_ARRAYBUFFER, "binary event data");
      doc->R("status", MJSON_INT, "return status of bm_open_buffer(), bm_request_event(), bm_set_cache_size(), bm_receive_alloc()");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string buffer_name  = mjsonrpc_get_param(params, "buffer_name", &error)->GetString(); if (error) return error;
   int event_id = mjsonrpc_get_param(params, "event_id", NULL)->GetInt();
   int trigger_mask = mjsonrpc_get_param(params, "trigger_mask", NULL)->GetInt();
   bool get_recent  = mjsonrpc_get_param(params, "get_recent", NULL)->GetBool();
   const MJsonNodeVector* last_event_header = mjsonrpc_get_param(params, "last_event_header", NULL)->GetArray();
   int timeout_millisec = mjsonrpc_get_param(params, "timeout_millisec", NULL)->GetInt();
 
   int last_event_id      = 0;
   int last_trigger_mask  = 0;
   int last_serial_number = 0;
   int last_time_stamp    = 0;
 
   if (last_event_header && last_event_header->size() > 0) {
      if (last_event_header->size() != 4) {
         return mjsonrpc_make_error(-32602, "Invalid params", "last_event_header should be an array with 4 elements");
      }
      
      last_event_id      = (*last_event_header)[0]->GetInt();
      last_trigger_mask  = (*last_event_header)[1]->GetInt();
      last_serial_number = (*last_event_header)[2]->GetInt();
      last_time_stamp    = (*last_event_header)[3]->GetInt();
   }
 
   //printf("last event header: %d %d %d %d\n", last_event_id, last_trigger_mask, last_serial_number, last_time_stamp);
 
   if (event_id == 0)
      event_id = EVENTID_ALL;
 
   if (trigger_mask == 0)
      trigger_mask = TRIGGER_ALL;
 
   //printf("js_bm_receive_event: buffer \"%s\", event_id %d, trigger_mask 0x%04x\n", buffer_name.c_str(), event_id, trigger_mask);
 
   int status;
 
   HNDLE buffer_handle = 0;
 
   status = bm_get_buffer_handle(buffer_name.c_str(), &buffer_handle);
 
   if (status != BM_SUCCESS) {
      // if buffer not already open, we need to open it,
      // but we must hold a lock in case multiple RPC handler threads
      // try to open it at the same time. K.O.
      static std::mutex gMutex;
      std::lock_guard<std::mutex> lock_guard(gMutex); // lock the mutex
 
      // we have the lock. now we check if some other thread
      // opened the buffer while we were waiting for the lock. K.O.
      status = bm_get_buffer_handle(buffer_name.c_str(), &buffer_handle);
 
      if (status != BM_SUCCESS) {
         status = bm_open_buffer(buffer_name.c_str(), 0, &buffer_handle);
         if (status != BM_SUCCESS && status != BM_CREATED) {
            MJsonNode* result = MJsonNode::MakeObject();
            result->AddToObject("status", MJsonNode::MakeInt(status));
            return mjsonrpc_make_result(result);
         }
         status = bm_set_cache_size(buffer_handle, 0, 0);
         if (status != BM_SUCCESS) {
            MJsonNode* result = MJsonNode::MakeObject();
            result->AddToObject("status", MJsonNode::MakeInt(status));
            return mjsonrpc_make_result(result);
         }
         int request_id = 0;
         status = bm_request_event(buffer_handle, EVENTID_ALL, TRIGGER_ALL, GET_NONBLOCKING, &request_id, NULL);
         if (status != BM_SUCCESS) {
            MJsonNode* result = MJsonNode::MakeObject();
            result->AddToObject("status", MJsonNode::MakeInt(status));
            return mjsonrpc_make_result(result);
         }
      }
   }
 
   if (timeout_millisec <= 0)
      timeout_millisec = 100.0;
 
   double start_time = ss_time_sec();
   double end_time = start_time + timeout_millisec/1000.0;
 
   // in "GET_RECENT" mode, we read all avialable events from the event buffer
   // and save them in the event stash (MatchEvent()), after we empty the event
   // buffer (BM_ASYNC_RETURN), we send the last saved event. K.O.
 
   while (1) {
      EVENT_HEADER* pevent = NULL;
      
      status = bm_receive_event_alloc(buffer_handle, &pevent, BM_NO_WAIT);
 
      if (status == BM_SUCCESS) {
         //printf("got event_id %d, trigger_mask 0x%04x\n", pevent->event_id, pevent->trigger_mask);
 
         if (get_recent) {
            if (bm_match_event(event_id, trigger_mask, pevent)) {
               StashEvent(buffer_name, event_id, trigger_mask, pevent);
            } else {
               MatchEvent(buffer_name, pevent);
            }
            free(pevent);
            pevent = NULL;
         } else {
            if (bm_match_event(event_id, trigger_mask, pevent)) {
               StashEvent(buffer_name, event_id, trigger_mask, pevent);
 
               size_t event_size = sizeof(EVENT_HEADER) + pevent->data_size;
               //size_t total_size = ALIGN8(event_size);
               return MJsonNode::MakeArrayBuffer((char*)pevent, event_size);
            }
 
            MatchEvent(buffer_name, pevent);
            
            free(pevent);
            pevent = NULL;
         }
      } else if (status == BM_ASYNC_RETURN) {
         if (get_recent) {
            //printf("bm_async_return!\n");
            break;
         }
         ss_sleep(10);
      } else {
         MJsonNode* result = MJsonNode::MakeObject();
         result->AddToObject("status", MJsonNode::MakeInt(status));
         return mjsonrpc_make_result(result);
      }
 
      if (ss_time_sec() > end_time) {
         //printf("timeout!\n");
         break;
      }
   }
 
   const EVENT_HEADER* pevent = FindEvent(buffer_name, event_id, trigger_mask, last_event_id, last_trigger_mask, last_serial_number, last_time_stamp);
   if (pevent) {
      size_t event_size = sizeof(EVENT_HEADER) + pevent->data_size;
      //size_t total_size = ALIGN8(event_size);
      return MJsonNode::MakeArrayBuffer((char*)pevent, event_size);
   }
      
   MJsonNode* result = MJsonNode::MakeObject();
   result->AddToObject("status", MJsonNode::MakeInt(BM_ASYNC_RETURN));
   return mjsonrpc_make_result(result);
}
 
//
// ss_system code goes here
//
 
static MJsonNode* js_ss_millitime(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("get current MIDAS time using ss_millitime()");
      doc->P(NULL, 0, "there are no input parameters");
      doc->R(NULL, MJSON_INT, "current value of ss_millitime()");
      return doc;
   }
 
   return mjsonrpc_make_result(MJsonNode::MakeNumber(ss_millitime()));
}
 
//
// Alarm code goes here
//
 
static MJsonNode* get_alarms(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("get alarm data");
      doc->P("get_all?", MJSON_BOOL, "get all alarms, even in alarm system not active and alarms not triggered");
      doc->R("status", MJSON_INT, "return status of midas library calls");
      doc->R("alarm_system_active", MJSON_BOOL, "value of ODB \"/Alarms/alarm system active\"");
      doc->R("alarms", MJSON_OBJECT, "alarm data, keyed by alarm name");
      doc->R("alarms[].triggered", MJSON_BOOL, "alarm is triggered");
      doc->R("alarms[].active", MJSON_BOOL, "alarm is enabled");
      doc->R("alarms[].class", MJSON_STRING, "alarm class");
      doc->R("alarms[].type", MJSON_INT, "alarm type AT_xxx");
      doc->R("alarms[].bgcolor", MJSON_STRING, "display background color");
      doc->R("alarms[].fgcolor", MJSON_STRING, "display foreground color");
      doc->R("alarms[].message", MJSON_STRING, "alarm ODB message field");
      doc->R("alarms[].condition", MJSON_STRING, "alarm ODB condition field");
      doc->R("alarms[].evaluated_value?", MJSON_STRING, "evaluated alarm condition (AT_EVALUATED alarms only)");
      doc->R("alarms[].periodic_next_time?", MJSON_STRING, "next time the periodic alarm will fire (AT_PERIODIC alarms only)");
      doc->R("alarms[].time_triggered_first", MJSON_STRING, "time when alarm was triggered");
      doc->R("alarms[].show_to_user", MJSON_STRING, "final alarm text shown to user by mhttpd");
      return doc;
   }
 
   //MJsonNode* error = NULL;
 
   bool get_all = mjsonrpc_get_param(params, "get_all", NULL)->GetBool();
 
   int status;
   HNDLE hDB;
 
   status = cm_get_experiment_database(&hDB, NULL);
 
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   int flag;
   int size;
   int alarm_system_active = 0;
 
   /* check global alarm flag */
   flag = TRUE;
   size = sizeof(flag);
   status = db_get_value(hDB, 0, "/Alarms/Alarm System active", &flag, &size, TID_BOOL, TRUE);
 
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   alarm_system_active = flag;
 
   if (!alarm_system_active)
      if (!get_all) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(SUCCESS),
                                     "alarm_system_active", MJsonNode::MakeBool(alarm_system_active!=0),
                                     "alarms", MJsonNode::MakeObject());
      }
 
   /* go through all alarms */
   HNDLE hkey;
   status = db_find_key(hDB, 0, "/Alarms/Alarms", &hkey);
 
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   MJsonNode* alarms = MJsonNode::MakeObject();
 
   for (int i = 0;; i++) {
      HNDLE hsubkey;
      KEY key;
 
      db_enum_link(hDB, hkey, i, &hsubkey);
 
      if (!hsubkey)
         break;
 
      status = db_get_key(hDB, hsubkey, &key);
         
      const char* name = key.name;
 
      flag = 0;
      size = sizeof(flag);
      status = db_get_value(hDB, hsubkey, "Triggered", &flag, &size, TID_INT, TRUE);
 
      // skip un-triggered alarms
      if (!flag)
         if (!get_all)
            continue;
 
      MJsonNode* a = MJsonNode::MakeObject();
 
      a->AddToObject("triggered", MJsonNode::MakeBool(flag!=0));
 
      flag = 1;
      size = sizeof(BOOL);
      status = db_get_value(hDB, hsubkey, "Active", &flag, &size, TID_BOOL, TRUE);
 
      a->AddToObject("active", MJsonNode::MakeBool(flag!=0));
 
      char alarm_class[NAME_LENGTH];
      strcpy(alarm_class, "Alarm");
      size = sizeof(alarm_class);
      status = db_get_value(hDB, hsubkey, "Alarm Class", alarm_class, &size, TID_STRING, TRUE);
 
      ss_repair_utf8(alarm_class);
      a->AddToObject("class", MJsonNode::MakeString(alarm_class));
 
      int atype = 0;
      size = sizeof(atype);
      status = db_get_value(hDB, hsubkey, "Type", &atype, &size, TID_INT, TRUE);
         
      a->AddToObject("type", MJsonNode::MakeInt(atype));
 
      char str[256];
 
      char bgcol[256];
      strcpy(bgcol, "red");
 
      if (strlen(alarm_class) > 0) {
         sprintf(str, "/Alarms/Classes/%s/Display BGColor", alarm_class);
         size = sizeof(bgcol);
         status = db_get_value(hDB, 0, str, bgcol, &size, TID_STRING, TRUE);
      }
         
      ss_repair_utf8(bgcol);
      a->AddToObject("bgcolor", MJsonNode::MakeString(bgcol));
 
      char fgcol[256];
      strcpy(fgcol, "black");
 
      if (strlen(alarm_class) > 0) {
         sprintf(str, "/Alarms/Classes/%s/Display FGColor", alarm_class);
         size = sizeof(fgcol);
         status = db_get_value(hDB, 0, str, fgcol, &size, TID_STRING, TRUE);
      }
         
      ss_repair_utf8(fgcol);
      a->AddToObject("fgcolor", MJsonNode::MakeString(fgcol));
 
      flag = 1;
      if (strlen(alarm_class) > 0) {
         size = sizeof(BOOL);
         sprintf(str, "/Alarms/Classes/%s/Alarm sound", alarm_class);
         status = db_get_value(hDB, 0, str, &flag, &size, TID_BOOL, TRUE);
      }
      a->AddToObject("alarm_sound", MJsonNode::MakeBool(flag!=0));
 
      char msg[256];
      msg[0] = 0;
      size = sizeof(msg);
      status = db_get_value(hDB, hsubkey, "Alarm Message", msg, &size, TID_STRING, TRUE);
         
      ss_repair_utf8(msg);
      a->AddToObject("message", MJsonNode::MakeString(msg));
 
      char cond[256];
      cond[0] = 0;
      size = sizeof(cond);
      status = db_get_value(hDB, hsubkey, "Condition", cond, &size, TID_STRING, TRUE);
 
      ss_repair_utf8(cond);
      a->AddToObject("condition", MJsonNode::MakeString(cond));
 
      std::string show_to_user;
      
      if (atype == AT_EVALUATED) {
         /* retrieve value */
         std::string value;
         al_evaluate_condition(name, cond, &value);
         show_to_user = msprintf(msg, value.c_str());
         ss_repair_utf8(value);
         a->AddToObject("evaluated_value", MJsonNode::MakeString(value.c_str()));
      } else
         show_to_user = msg;
      
      ss_repair_utf8(show_to_user);
      a->AddToObject("show_to_user", MJsonNode::MakeString(show_to_user.c_str()));
 
      str[0] = 0;
      size = sizeof(str);
      status = db_get_value(hDB, hsubkey, "Time triggered first", str, &size, TID_STRING, TRUE);
 
      ss_repair_utf8(str);
      a->AddToObject("time_triggered_first", MJsonNode::MakeString(str));
 
      if (atype == AT_PERIODIC) {
         DWORD last = 0;
         size = sizeof(last);
         db_get_value(hDB, hsubkey, "Checked last", &last, &size, TID_DWORD, TRUE);
 
         if (last == 0) {
            last = ss_time();
            db_set_value(hDB, hsubkey, "Checked last", &last, size, 1, TID_DWORD);
         }
 
         int interval = 0;
         size = sizeof(interval);
         db_get_value(hDB, hsubkey, "Check interval", &interval, &size, TID_INT, TRUE);
 
         time_t tnext = last + interval;
 
         char ctimebuf[32];
         ctime_r(&tnext, ctimebuf);
 
         //ss_repair_utf8(ctimebuf); redundant!
         a->AddToObject("periodic_next_time", MJsonNode::MakeString(ctimebuf));
      }
 
      alarms->AddToObject(name, a);
   }
 
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(SUCCESS),
                               "alarm_system_active", MJsonNode::MakeBool(alarm_system_active!=0),
                               "alarms", alarms);
}
 
//
// Sequencer and file_picker code goes here
//
 
static MJsonNode* js_make_subdir(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("js_make_subdir");
      doc->P("subdir", MJSON_STRING, "Create folder experiment_directory/userfiles/subdir");
      doc->R("status", MJSON_INT, "return status of midas library calls");
      doc->R("path", MJSON_STRING, "Search path");
      return doc;
   }
 
   MJsonNode* error = NULL;
 
   std::string subdir = mjsonrpc_get_param(params, "subdir", &error)->GetString(); if (error) return error;
 
   /*---- Not allowed to contain ../ - safety feature ----*/
   if (subdir.find("..") != std::string::npos) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("The subdir is not permitted"));
   }
 
   int status;
   HNDLE hDB;
 
   status = cm_get_experiment_database(&hDB, NULL);
 
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   std::string path = cm_expand_env(cm_get_path().c_str());
   if (path[path.length()-1] != DIR_SEPARATOR) {
      path += DIR_SEPARATOR_STR;
   }
   path += "userfiles";
   
   // Check if the userfiles folder exists
   if (access(path.c_str(), F_OK) != 0) {
      // Create the path if it doesn't exist
      if (mkdir(path.c_str(), 0777) != 0) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("Failed to create the userfiles folder"));
      }
   }
 
   // Add subdir to userfiles
   if (subdir.length() > 0) {
      if (subdir[0] != DIR_SEPARATOR) {
         path += DIR_SEPARATOR_STR;
      }
      path += subdir;
   }
   // Check if the subdir exisits in userfiles, otherwise create it
   if (access(path.c_str(), F_OK) != 0) {
      // Create the path if it doesn't exist
      if (mkdir(path.c_str(), 0777) != 0) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("Failed to create subdirectory"));
      }
   }
   
   
   MJsonNode* r = MJsonNode::MakeObject();
   r->AddToObject("status", MJsonNode::MakeInt(SUCCESS));
   ss_repair_utf8(path);
   r->AddToObject("path", MJsonNode::MakeString(path.c_str()));
   return mjsonrpc_make_result(r);
}
 
static MJsonNode* js_ext_list_files(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("js_ext_list_files");
      doc->P("subdir", MJSON_STRING, "List files in experiment_directory/userfiles/subdir");
      doc->P("fileext", MJSON_STRING, "Filename extension");
      doc->R("status", MJSON_INT, "return status of midas library calls");
      doc->R("path", MJSON_STRING, "Search path");
      doc->R("subdirs[]", MJSON_STRING, "list of subdirectories");
      doc->R("files[].filename", MJSON_STRING, "script filename");
      doc->R("files[].description", MJSON_STRING, "script description");
      return doc;
   }
 
   MJsonNode* error = NULL;
   std::string subdir = mjsonrpc_get_param(params, "subdir", &error)->GetString(); if (error) return error;
   std::string fileext  = mjsonrpc_get_param(params, "fileext", &error)->GetString(); if (error) return error;
 
   /*---- Not allowed to contain ../ - safety feature ----*/
   if (subdir.find("..") != std::string::npos) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("The subdir is not permitted"));
   }
 
   /*---- ext must start with *. and some not allowed ext - safety feature */
   if (fileext.find("..") != std::string::npos) {
      /*
       fileext.find("/") != std::string::npos ||
       fileext.find("*.") != 0 ||
       fileext.find("*.html") != std::string::npos || fileext.find("*.HTML") != std::string::npos ||
       fileext.find("*.htm") != std::string::npos || fileext.find("*.HTM") != std::string::npos ||
       fileext.find("*.js") != std::string::npos || fileext.find("*.JS") != std::string::npos ||
       fileext.find("*.pl") != std::string::npos || fileext.find("*.PL") != std::string::npos ||
       fileext.find("*.cgi") != std::string::npos || fileext.find("*.CGI") != std::string::npos ||
       fileext.find("*.*") != std::string::npos
       ) {
      */
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("The filename extension is not permitted"));
   }
   
   int status;
   HNDLE hDB;
 
   status = cm_get_experiment_database(&hDB, NULL);
 
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status));
   }
 
   std::string path = cm_expand_env(cm_get_path().c_str());
   if (path[path.length()-1] != DIR_SEPARATOR) {
      path += DIR_SEPARATOR_STR;
   }
   path += "userfiles";
   
   // Check if the userfiles folder exists
   if (access(path.c_str(), F_OK) != 0) {
      // Create the path if it doesn't exist
      if (mkdir(path.c_str(), 0777) != 0) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("Failed to create the userfiles folder"));
      }
   }
   
   if (subdir.length() > 0) {
      if (subdir[0] != DIR_SEPARATOR) {
         path += DIR_SEPARATOR_STR;
      }
      path += subdir;
   }
 
   char* flist = NULL;
   MJsonNode* s = MJsonNode::MakeArray();
   
   /*---- go over subdirectories ----*/
   int n = ss_dirlink_find(path.c_str(), "*", &flist);
 
   for (int i=0 ; i<n ; i++) {
      if (flist[i*MAX_STRING_LENGTH] != '.') {
         //printf("subdir %d: [%s]\n", i, flist+i*MAX_STRING_LENGTH);
         ss_repair_utf8(flist+i*MAX_STRING_LENGTH);
         s->AddToArray(MJsonNode::MakeString(flist+i*MAX_STRING_LENGTH));
      }
   }
   
   MJsonNode* f = MJsonNode::MakeArray();
   time_t modtime = time(NULL);
   double fsize;
   /*---- go over files with extension fileext in path ----*/
   n = ss_file_find(path.c_str(), fileext.c_str(), &flist);
 
   if (n == -1) {
      // path does not exist, return an error
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("Subdirectory does not exist, create it first."));
   }
   
   for (int i=0 ; i<n ; i++) {
      //printf("file %d: [%s]\n", i, flist+i*MAX_STRING_LENGTH);
      MJsonNode* o = MJsonNode::MakeObject();
      ss_repair_utf8(flist+i*MAX_STRING_LENGTH);
      o->AddToObject("filename", MJsonNode::MakeString(flist+i*MAX_STRING_LENGTH));
      /* description is msl specific, do we need it? */
      std::string full_name = path;
      if (full_name.back() != DIR_SEPARATOR)
         full_name += DIR_SEPARATOR;
      full_name.append(flist+i*MAX_STRING_LENGTH);
      // o->AddToObject("description", MJsonNode::MakeString(full_name.c_str()));
      o->AddToObject("description", MJsonNode::MakeString("description"));
      modtime = ss_file_time(full_name.c_str());
      o->AddToObject("modtime", MJsonNode::MakeInt(modtime));
      fsize = ss_file_size(full_name.c_str());
      o->AddToObject("size", MJsonNode::MakeInt(fsize));
      f->AddToArray(o);
   }
 
   free(flist);
   flist = NULL;
 
   MJsonNode* r = MJsonNode::MakeObject();
   r->AddToObject("status", MJsonNode::MakeInt(SUCCESS));
   ss_repair_utf8(path);
   r->AddToObject("path", MJsonNode::MakeString(path.c_str()));
   r->AddToObject("subdirs", s);
   r->AddToObject("files", f);
   
   return mjsonrpc_make_result(r);
 
}
 
static MJsonNode* js_ext_save_file(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("js_ext_save_file");
      doc->P("filename", MJSON_STRING, "File name, save in experiment_directory/userfiles/filename");
      doc->P("script", MJSON_STRING, "ASCII content");
      doc->R("status", MJSON_INT, "return status of midas library calls");
      doc->R("error", MJSON_STRING, "error text");
      return doc;
   }
 
   /* Need to make sure that content cannot be abused (e.g. not Javascript code), how?? */
   
   MJsonNode* error = NULL;
   std::string filename = mjsonrpc_get_param(params, "filename", &error)->GetString(); if (error) return error;
   std::string script = mjsonrpc_get_param(params, "script", &error)->GetString(); if (error) return error;
 
   /*---- filename should not contain the following - safety feature */
   if (filename.find("..") != std::string::npos ) {
      /*
       filename.find("*") != std::string::npos ||
       filename.find(".html") != std::string::npos || filename.find(".HTML") != std::string::npos ||
       filename.find(".htm") != std::string::npos || filename.find(".HTM") != std::string::npos ||
       filename.find(".js") != std::string::npos || filename.find(".JS") != std::string::npos ||
       filename.find(".pl") != std::string::npos || filename.find(".PL") != std::string::npos ||
       filename.find(".cgi") != std::string::npos || filename.find(".CGI") != std::string::npos
       ) {
      */
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("The filename is not permitted"));
   }
 
   int status;
   HNDLE hDB;
 
   status = cm_get_experiment_database(&hDB, NULL);
 
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString("cm_get_experiment_database() error"));
   }
 
   std::string path = cm_expand_env(cm_get_path().c_str());
   path += "userfiles";
 
   // Check if the userfiles folder exists
   if (access(path.c_str(), F_OK) != 0) {
      // Create the path if it doesn't exist
      if (mkdir(path.c_str(), 0777) != 0) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("Failed to create the userfiles folder"));
      }
   }
   
   path += DIR_SEPARATOR_STR;
   path += filename;
 
   FILE* fp = fopen(path.c_str(), "w");
   if (!fp) {
      status = SS_FILE_ERROR;
      char errstr[256];
      sprintf(errstr, "fopen() errno %d (%s)", errno, strerror(errno));
      ss_repair_utf8(errstr);
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString(errstr));
   }
 
   fwrite(script.c_str(), script.length(), 1, fp);
   //fprintf(fp, "\n");
   fclose(fp);
   fp = NULL;
 
   status = CM_SUCCESS;
   std::string errstr = "no error";
 
   //ss_repair_utf8(errstr); redundant!
   return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString(errstr.c_str()));
}
 
static MJsonNode* js_ext_read_file(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("js_ext_read_script");
      doc->P("filename", MJSON_STRING, "File name, read from experiment_directory/userfiles/filename");
      doc->R("content", MJSON_STRING, "ASCII file content");
      doc->R("status", MJSON_INT, "return status of midas library calls");
      doc->R("error", MJSON_STRING, "error text");
      return doc;
   }
   
   MJsonNode* error = NULL;
   std::string filename = mjsonrpc_get_param(params, "filename", &error)->GetString(); if (error) return error;
   
   /*---- filename should not contain the following - safety feature */
   if (filename.find("..") != std::string::npos ||
       filename.find("*") != std::string::npos) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("The filename is not permitted"));
   }
   
   int status;
   HNDLE hDB;
   
   status = cm_get_experiment_database(&hDB, NULL);
   
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString("cm_get_experiment_database() error"));
   }
 
   std::string path = cm_expand_env(cm_get_path().c_str());
   if (path[path.length()-1] != DIR_SEPARATOR) {
      path += DIR_SEPARATOR_STR;
   }
   path += "userfiles";
 
   // Check if the userfiles folder exists
   if (access(path.c_str(), F_OK) != 0) {
      // Create the path if it doesn't exist
      if (mkdir(path.c_str(), 0777) != 0) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("Failed to create the userfiles folder"));
      }
   }
 
   path += DIR_SEPARATOR_STR;
   path += filename;
   
   FILE* fp = fopen(path.c_str(), "r");
   if (!fp) {
      status = SS_FILE_ERROR;
      char errstr[256];
      sprintf(errstr, "fopen() errno %d (%s)", errno, strerror(errno));
      ss_repair_utf8(errstr);
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString(errstr));
   }
   
   fseek(fp, 0, SEEK_END);
   size_t file_size = ftell(fp);
   rewind(fp);
   
   char* buffer = new char[file_size+1];
   fread(buffer, file_size, 1, fp);
   // Maybe not needed here
   buffer[file_size] = '\0';
   fclose(fp);
   
   std::string content = buffer;
   delete[] buffer;
   buffer = NULL;
   
   status = CM_SUCCESS;
   std::string errstr = "no error";
   
   return mjsonrpc_make_result("content", MJsonNode::MakeString(content.c_str()), "status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString(errstr.c_str()));
}
 
//
// Binary files reading for file_picker code goes here
//
 
static MJsonNode* js_read_binary_file(const MJsonNode* params) {
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("js_read_binary_file");
      doc->P("filename", MJSON_STRING, "File name, read from experiment_directory/userfiles/filename");
      doc->R("binary data", MJSON_ARRAYBUFFER, "Binary file content");
      doc->R("status", MJSON_INT, "Return status of midas library calls");
      doc->R("error", MJSON_STRING, "Error text");
      return doc;
   }
   
   MJsonNode* error = NULL;
   std::string filename = mjsonrpc_get_param(params, "filename", &error)->GetString();
   if (error) return error;
   
   /*---- filename should not contain the following - safety feature */
   if (filename.find("..") != std::string::npos ||
       filename.find("*") != std::string::npos) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("The filename is not permitted"));
   }
   
   int status;
   HNDLE hDB;
   
   status = cm_get_experiment_database(&hDB, NULL);
   
   if (status != DB_SUCCESS) {
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString("cm_get_experiment_database() error"));
   }
   
   std::string path = cm_expand_env(cm_get_path().c_str());
   if (path[path.length()-1] != DIR_SEPARATOR) {
      path += DIR_SEPARATOR_STR;
   }
   path += "userfiles";
   
   // Check if the userfiles folder exists
   if (access(path.c_str(), F_OK) != 0) {
      // Create the path if it doesn't exist
      if (mkdir(path.c_str(), 0777) != 0) {
         return mjsonrpc_make_result("status", MJsonNode::MakeInt(DB_INVALID_PARAM), "error", MJsonNode::MakeString("Failed to create the userfiles folder"));
      }
   }
   
   path += DIR_SEPARATOR_STR;
   path += filename;
   
   FILE* fp = fopen(path.c_str(), "rb");
   if (!fp) {
      status = SS_FILE_ERROR;
      char errstr[256];
      sprintf(errstr, "fopen() errno %d (%s)", errno, strerror(errno));
      ss_repair_utf8(errstr);
      return mjsonrpc_make_result("status", MJsonNode::MakeInt(status), "error", MJsonNode::MakeString(errstr));
   }
    
   fseek(fp, 0, SEEK_END);
   size_t file_size = ftell(fp);
   rewind(fp);
   
   char* buffer = new char[file_size];
   fread(buffer, file_size, 1, fp);
   // maybe not needed here
   //buffer[file_size] = '\0';
   fclose(fp);
   
   status = CM_SUCCESS;
   std::string errstr = "no error";
    
   MJsonNode* result = MJsonNode::MakeArrayBuffer(buffer, file_size);
   return result;
}
 
 
//
// JSON-RPC management code goes here
//
 
static MJsonNode* get_debug(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("get current value of mjsonrpc_debug");
      doc->P(NULL, 0, "there are no input parameters");
      doc->R(NULL, MJSON_INT, "current value of mjsonrpc_debug");
      return doc;
   }
 
   return mjsonrpc_make_result("debug", MJsonNode::MakeInt(mjsonrpc_debug));
}
 
static MJsonNode* set_debug(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("set new value of mjsonrpc_debug");
      doc->P(NULL, MJSON_INT, "new value of mjsonrpc_debug");
      doc->R(NULL, MJSON_INT, "new value of mjsonrpc_debug");
      return doc;
   }
 
   mjsonrpc_debug = params->GetInt();
   return mjsonrpc_make_result("debug", MJsonNode::MakeInt(mjsonrpc_debug));
}
 
static MJsonNode* get_sleep(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("get current value of mjsonrpc_sleep");
      doc->P(NULL, 0, "there are no input parameters");
      doc->R(NULL, MJSON_INT, "current value of mjsonrpc_sleep");
      return doc;
   }
 
   return mjsonrpc_make_result("sleep", MJsonNode::MakeInt(mjsonrpc_sleep));
}
 
static MJsonNode* set_sleep(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("set new value of mjsonrpc_sleep");
      doc->P(NULL, MJSON_INT, "new value of mjsonrpc_sleep");
      doc->R(NULL, MJSON_INT, "new value of mjsonrpc_sleep");
      return doc;
   }
 
   mjsonrpc_sleep = params->GetInt();
   return mjsonrpc_make_result("sleep", MJsonNode::MakeInt(mjsonrpc_sleep));
}
 
static MJsonNode* get_time(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("get current value of mjsonrpc_time");
      doc->P(NULL, 0, "there are no input parameters");
      doc->R(NULL, MJSON_INT, "current value of mjsonrpc_time");
      return doc;
   }
 
   return mjsonrpc_make_result("time", MJsonNode::MakeInt(mjsonrpc_time));
}
 
static MJsonNode* set_time(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("set new value of mjsonrpc_time");
      doc->P(NULL, MJSON_INT, "new value of mjsonrpc_time");
      doc->R(NULL, MJSON_INT, "new value of mjsonrpc_time");
      return doc;
   }
 
   mjsonrpc_time = params->GetInt();
   return mjsonrpc_make_result("time", MJsonNode::MakeInt(mjsonrpc_time));
}
 
static MJsonNode* get_schema(const MJsonNode* params)
{
   if (!params) {
      MJSO* doc = MJSO::I();
      doc->D("Get the MIDAS JSON-RPC schema JSON object");
      doc->P(NULL, 0, "there are no input parameters");
      doc->R(NULL, MJSON_OBJECT, "returns the MIDAS JSON-RPC schema JSON object");
      return doc;
   }
 
   return mjsonrpc_make_result(mjsonrpc_get_schema());
}
 
static MJsonNode* js_get_timezone(const MJsonNode* params)
{
   if (!params) {
      MJSO *doc = MJSO::I();
      doc->D("get current server timezone offset in seconds");
      doc->P(NULL, 0, "there are no input parameters");
      doc->R(NULL, MJSON_INT, "offset in seconds");
      return doc;
   }
 
   ss_tzset(); // required for localtime_r()
   time_t rawtime = time(NULL);
   struct tm gmt_tms;
   gmtime_r(&rawtime, &gmt_tms);
   time_t gmt = ss_mktime(&gmt_tms);
   struct tm tms;
   localtime_r(&rawtime, &tms);
   time_t offset = rawtime - gmt + (tms.tm_isdst ? 3600 : 0);
 
   return mjsonrpc_make_result(MJsonNode::MakeNumber(offset));
}
 
 
//
// No RPC handlers beyound here
//
 
struct MethodsTableEntry
{
   mjsonrpc_handler_t* fHandler = NULL;
   bool fNeedsLocking = false;
};
   
typedef std::map<std::string, MethodsTableEntry> MethodsTable;
typedef MethodsTable::iterator MethodsTableIterator;
 
static MethodsTable gMethodsTable;
static std::mutex* gMutex = NULL;
 
void mjsonrpc_add_handler(const char* method, mjsonrpc_handler_t* handler, bool needs_locking)
{
   MethodsTableEntry e;
   e.fHandler = handler;
   e.fNeedsLocking = needs_locking;
   gMethodsTable[method] = e;
}
 
void mjsonrpc_set_std_mutex(void* mutex)
{
   gMutex = (std::mutex*)mutex;
}
 
void mjsonrpc_init()
{
   if (mjsonrpc_debug) {
      printf("mjsonrpc_init!\n");
   }
 
   if (!gNullNode)
      gNullNode = MJsonNode::MakeNull();
 
   // test, debug and control methods for the rpc system
   mjsonrpc_add_handler("null", xnull);
   mjsonrpc_add_handler("get_debug",   get_debug);
   mjsonrpc_add_handler("set_debug",   set_debug);
   mjsonrpc_add_handler("get_sleep",   get_sleep);
   mjsonrpc_add_handler("set_sleep",   set_sleep);
   mjsonrpc_add_handler("get_time",    get_time);
   mjsonrpc_add_handler("set_time",    set_time);
   mjsonrpc_add_handler("get_schema",  get_schema);
   // interface to alarm functions
   mjsonrpc_add_handler("al_reset_alarm",    js_al_reset_alarm,    true);
   mjsonrpc_add_handler("al_trigger_alarm",  js_al_trigger_alarm,  true);
   mjsonrpc_add_handler("al_trigger_class",  js_al_trigger_class,  true);
   // interface to midas.c functions
   mjsonrpc_add_handler("cm_exist",          js_cm_exist,          true);
   mjsonrpc_add_handler("cm_msg_facilities", js_cm_msg_facilities);
   mjsonrpc_add_handler("cm_msg_retrieve",   js_cm_msg_retrieve);
   mjsonrpc_add_handler("cm_msg1",           js_cm_msg1);
   mjsonrpc_add_handler("cm_shutdown",   js_cm_shutdown,   true);
   mjsonrpc_add_handler("cm_transition", js_cm_transition, true);
   mjsonrpc_add_handler("bm_receive_event", js_bm_receive_event, true);
   // interface to odb functions
   mjsonrpc_add_handler("db_copy",     js_db_copy);
   mjsonrpc_add_handler("db_paste",    js_db_paste);
   mjsonrpc_add_handler("db_get_values", js_db_get_values);
   mjsonrpc_add_handler("db_ls",       js_db_ls);
   mjsonrpc_add_handler("db_create", js_db_create);
   mjsonrpc_add_handler("db_delete", js_db_delete);
   mjsonrpc_add_handler("db_resize", js_db_resize);
   mjsonrpc_add_handler("db_resize_string", js_db_resize_string);
   mjsonrpc_add_handler("db_rename", js_db_rename);
   mjsonrpc_add_handler("db_scl",    js_db_scl);
   mjsonrpc_add_handler("db_sor",    js_db_sor);
   mjsonrpc_add_handler("db_link",   js_db_link);
   mjsonrpc_add_handler("db_reorder", js_db_reorder);
   mjsonrpc_add_handler("db_key",    js_db_key);
   // interface to elog functions
   mjsonrpc_add_handler("el_retrieve", js_el_retrieve, true);
   mjsonrpc_add_handler("el_query",    js_el_query,    true);
   mjsonrpc_add_handler("el_delete",   js_el_delete,   true);
   // interface to midas history
   mjsonrpc_add_handler("hs_get_active_events", js_hs_get_active_events, true);
   mjsonrpc_add_handler("hs_get_channels", js_hs_get_channels, true);
   mjsonrpc_add_handler("hs_get_events", js_hs_get_events, true);
   mjsonrpc_add_handler("hs_get_tags", js_hs_get_tags, true);
   mjsonrpc_add_handler("hs_get_last_written", js_hs_get_last_written, true);
   mjsonrpc_add_handler("hs_reopen", js_hs_reopen, true);
   mjsonrpc_add_handler("hs_read", js_hs_read, true);
   mjsonrpc_add_handler("hs_read_binned", js_hs_read_binned, true);
   mjsonrpc_add_handler("hs_read_arraybuffer", js_hs_read_arraybuffer, true);
   mjsonrpc_add_handler("hs_read_binned_arraybuffer", js_hs_read_binned_arraybuffer, true);
   // interface to image history
   mjsonrpc_add_handler("hs_image_retrieve", js_hs_image_retrieve, true);
   // sequencer and file_picker
   mjsonrpc_add_handler("make_subdir", js_make_subdir, true);
   mjsonrpc_add_handler("ext_list_files", js_ext_list_files, true);
   mjsonrpc_add_handler("ext_save_file", js_ext_save_file, true);
   mjsonrpc_add_handler("ext_read_file", js_ext_read_file, true);
   // Read binary files of Uint8Arry
   mjsonrpc_add_handler("read_binary_file", js_read_binary_file, true);
   // interface to ss_system functions
   mjsonrpc_add_handler("ss_millitime", js_ss_millitime);
   // methods that perform computations or invoke actions
   mjsonrpc_add_handler("get_alarms",  get_alarms);
   //mjsonrpc_add_handler("get_messages",  get_messages);
   mjsonrpc_add_handler("jrpc",  jrpc);
   mjsonrpc_add_handler("brpc",  brpc);
   mjsonrpc_add_handler("start_program", start_program);
   mjsonrpc_add_handler("exec_script", exec_script);
   // timezone function
   mjsonrpc_add_handler("get_timezone", js_get_timezone);
 
   mjsonrpc_user_init();
}
 
void mjsonrpc_exit()
{
   if (mjsonrpc_debug) {
      printf("mjsonrpc_exit!\n");
   }
 
   js_hs_exit();
   DeleteEventStash();
}
 
static MJsonNode* mjsonrpc_make_schema(MethodsTable* h)
{
   MJsonNode* s = MJsonNode::MakeObject();
 
   s->AddToObject("$schema", MJsonNode::MakeString("http://json-schema.org/schema#"));
   s->AddToObject("id", MJsonNode::MakeString("MIDAS JSON-RPC autogenerated schema"));
   s->AddToObject("title", MJsonNode::MakeString("MIDAS JSON-RPC schema"));
   s->AddToObject("description", MJsonNode::MakeString("Autogenerated schema for all MIDAS JSON-RPC methods"));
   s->AddToObject("type", MJsonNode::MakeString("object"));
 
   MJsonNode* m = MJsonNode::MakeObject();
 
   for (MethodsTableIterator iterator = h->begin(); iterator != h->end(); iterator++) {
      // iterator->first = key
      // iterator->second = value
      //printf("build schema for method \"%s\"!\n", iterator->first.c_str());
      MJsonNode* doc = iterator->second.fHandler(NULL);
      if (doc == NULL)
         doc = MJsonNode::MakeObject();
      m->AddToObject(iterator->first.c_str(), doc);
   }
 
   s->AddToObject("properties", m);
   s->AddToObject("required", MJsonNode::MakeArray());
 
   return s;
}
 
MJsonNode* mjsonrpc_get_schema()
{
   return mjsonrpc_make_schema(&gMethodsTable);
}
 
#ifdef MJSON_DEBUG
static void mjsonrpc_print_schema()
{
   MJsonNode *s = mjsonrpc_get_schema();
   s->Dump(0);
   std::string str = s->Stringify(1);
   printf("MJSON-RPC schema:\n");
   printf("%s\n", str.c_str());
   delete s;
}
#endif
 
static std::string indent(int x, const char* p = " ")
{
   if (x<1)
      return "";
   std::string s;
   for (int i=0; i<x; i++)
      s += p;
   return s;
}
 
struct NestedLine {
   int nest;
   bool span;
   std::string text;
};
 
class NestedOutput
{
public:
   std::vector<NestedLine> fLines;
public:
   void Clear()
   {
      fLines.clear();
   }
 
   void Output(int nest, bool span, std::string text)
   {
      if (text.length() < 1)
         return;
 
      NestedLine l;
      l.nest = nest;
      l.span = span;
      l.text = text;
      fLines.push_back(l);
   };
 
   std::string Print()
   {
      std::vector<int> tablen;
      std::vector<std::string> tab;
      std::vector<std::string> tabx;
      
      tablen.push_back(0);
      tab.push_back("");
      tabx.push_back("");
      
      std::string xtab = "";
      int maxlen = 0;
      for (int n=0; ; n++) {
         int len = -1;
         for (unsigned i=0; i<fLines.size(); i++) {
            int nn = fLines[i].nest;
            bool pp = fLines[i].span;
            if (pp)
               continue;
            if (nn != n)
               continue;
            int l = fLines[i].text.length();
            if (l>len)
               len = l;
         }
         //printf("nest %d len %d\n", n, len);
         if (len < 0)
            break; // nothing with this nest level
         tablen.push_back(len);
         tab.push_back(indent(len, " ") + " | ");
         xtab += indent(len, " ") + " | ";
         tabx.push_back(xtab);
         maxlen += 3+len;
      }
      
      std::string s;
      int nest = 0;
      
      for (unsigned i=0; i<fLines.size(); i++) {
         int n = fLines[i].nest;
         bool p = fLines[i].span;
         
         std::string pad;
         
         if (!p) {
            int ipad = tablen[n+1] - fLines[i].text.length();
            pad = indent(ipad, " ");
         }
         
         std::string hr = indent(maxlen-tabx[n].length(), "-");
         
         if (n > nest)
            s += std::string(" | ") + fLines[i].text + pad;
         else if (n == nest) {
            s += "\n";
            if (n == 0 || n == 1)
               s += tabx[n] + hr + "\n";
            s += tabx[n] + fLines[i].text + pad;
         } else {
            s += "\n";
            if (n == 0 || n == 1)
               s += tabx[n] + hr + "\n";
            s += tabx[n] + fLines[i].text + pad;
         }
         
         nest = n;
      }
 
      return s;
   }
};
 
static std::string mjsonrpc_schema_to_html_anything(const MJsonNode* schema, int nest_level, NestedOutput* o);
 
static std::string mjsonrpc_schema_to_html_object(const MJsonNode* schema, int nest_level, NestedOutput* o)
{
   const MJsonNode* d = schema->FindObjectNode("description");
   std::string description;
   if (d)
      description = d->GetString();
 
   std::string xshort = "object";
   if (description.length() > 1)
      xshort += "</td><td>" + description;
 
   const MJsonNode* properties = schema->FindObjectNode("properties");
 
   const MJsonNodeVector* required_list = NULL;
   const MJsonNode* r = schema->FindObjectNode("required");
   if (r)
      required_list = r->GetArray();
 
   if (!properties) {
      o->Output(nest_level, false, "object");
      o->Output(nest_level+1, true, description);
      return xshort;
   }
 
   const MJsonStringVector *names = properties->GetObjectNames();
   const MJsonNodeVector *nodes = properties->GetObjectNodes();
 
   if (!names || !nodes) {
      o->Output(nest_level, false, "object");
      o->Output(nest_level+1, true, description);
      return xshort;
   }
 
   std::string nest = indent(nest_level * 4);
 
   std::string s;
 
   s += nest + "<table border=1>\n";
 
   if (description.length() > 1) {
      s += nest + "<tr>\n";
      s += nest + "  <td colspan=3>" + description + "</td>\n";
      s += nest + "</tr>\n";
   }
 
   o->Output(nest_level, true, description);
 
   for (unsigned i=0; i<names->size(); i++) {
      std::string name = (*names)[i];
      const MJsonNode* node = (*nodes)[i];
 
      bool required = false;
      if (required_list)
         for (unsigned j=0; j<required_list->size(); j++)
            if ((*required_list)[j])
               if ((*required_list)[j]->GetString() == name) {
                  required = true;
                  break;
               }
 
      bool is_array = false;
      const MJsonNode* type = node->FindObjectNode("type");
      if (type && type->GetString() == "array")
         is_array = true;
 
      if (is_array)
         name += "[]";
 
      if (!required)
         name += "?";
 
      o->Output(nest_level, false, name);
 
      s += nest + "<tr>\n";
      s += nest + "  <td>" + name + "</td>\n";
      s += nest + "  <td>";
      s += mjsonrpc_schema_to_html_anything(node, nest_level + 1, o);
      s += "</td>\n";
      s += nest + "</tr>\n";
   }
 
   s += nest + "</table>\n";
 
   return s;
}
 
static std::string mjsonrpc_schema_to_html_array(const MJsonNode* schema, int nest_level, NestedOutput* o)
{
   const MJsonNode* d = schema->FindObjectNode("description");
   std::string description;
   if (d)
      description = d->GetString();
 
   std::string xshort = "array";
   if (description.length() > 1)
      xshort += "</td><td>" + description;
 
   const MJsonNode* items = schema->FindObjectNode("items");
 
   if (!items) {
      o->Output(nest_level, false, "array");
      o->Output(nest_level+1, true, description);
      return xshort;
   }
 
   const MJsonNodeVector *nodes = items->GetArray();
 
   if (!nodes) {
      o->Output(nest_level, false, "array");
      o->Output(nest_level+1, true, description);
      return xshort;
   }
 
   std::string nest = indent(nest_level * 4);
 
   std::string s;
 
   //s += "array</td><td>";
 
   s += nest + "<table border=1>\n";
 
   if (description.length() > 1) {
      s += nest + "<tr>\n";
      s += nest + "  <td>" + description + "</td>\n";
      s += nest + "</tr>\n";
   }
 
   o->Output(nest_level, true, description);
 
   for (unsigned i=0; i<nodes->size(); i++) {
      o->Output(nest_level, false, "array of");
 
      s += nest + "<tr>\n";
      s += nest + "  <td> array of " + mjsonrpc_schema_to_html_anything((*nodes)[i], nest_level + 1, o) + "</td>\n";
      s += nest + "</tr>\n";
   }
 
   s += nest + "</table>\n";
 
   return s;
}
 
std::string mjsonrpc_schema_to_html_anything(const MJsonNode* schema, int nest_level, NestedOutput* o)
{
   std::string type;
   std::string description;
   //bool        optional = false;
 
   const MJsonNode* t = schema->FindObjectNode("type");
   if (t)
      type = t->GetString();
   else
      type = "any";
 
   const MJsonNode* d = schema->FindObjectNode("description");
   if (d)
      description = d->GetString();
 
   //const MJsonNode* o = schema->FindObjectNode("optional");
   //if (o)
   //   optional = o->GetBool();
 
   if (type == "object") {
      return mjsonrpc_schema_to_html_object(schema, nest_level, o);
   } else if (type == "array") {
      return mjsonrpc_schema_to_html_array(schema, nest_level, o);
   } else {
      //if (optional)
      //   output(nest_level, false, "?");
      //else
      //   output(nest_level, false, "!");
      o->Output(nest_level, false, type);
      o->Output(nest_level+1, true, description);
      if (description.length() > 1) {
         return (type + "</td><td>" + description);
      } else {
         return (type);
      }
   }
}
 
std::string mjsonrpc_schema_to_text(const MJsonNode* schema)
{
   std::string s;
   NestedOutput out;
   out.Clear();
   mjsonrpc_schema_to_html_anything(schema, 0, &out);
   //s += "<pre>\n";
   //s += nested_dump();
   //s += "</pre>\n";
   s += out.Print();
   return s;
}
 
static void add(std::string* s, const char* text)
{
   assert(s != NULL);
   if (s->length() > 0)
      *s += ", ";
   *s += text;
}
 
static MJsonNode* mjsonrpc_handle_request(const MJsonNode* request)
{
   // find required request elements
   const MJsonNode* version = request->FindObjectNode("jsonrpc");
   const MJsonNode* method  = request->FindObjectNode("method");
   const MJsonNode* params  = request->FindObjectNode("params");
   const MJsonNode* id      = request->FindObjectNode("id");
 
   std::string bad = "";
 
   if (!version)
      add(&bad, "jsonrpc version is missing");
   if (!method)
      add(&bad, "method is missing");
   if (!params)
      add(&bad, "params is missing");
   if (!id)
      add(&bad, "id is missing");
 
   if (version&&version->GetType() != MJSON_STRING)
      add(&bad, "jsonrpc version is not a string");
   if (version&&version->GetString() != "2.0")
      add(&bad, "jsonrpc version is not 2.0");
 
   if (method&&method->GetType() != MJSON_STRING)
      add(&bad, "method is not a string");
 
   if (bad.length() > 0) {
      MJsonNode* response = mjsonrpc_make_error(-32600, "Invalid request", bad.c_str());
      response->AddToObject("jsonrpc", MJsonNode::MakeString("2.0"));
      if (id) {
         response->AddToObject("id", id->Copy());
      } else {
         response->AddToObject("id", MJsonNode::MakeNull());
      }
 
      if (mjsonrpc_debug) {
         printf("mjsonrpc: invalid request: reply:\n");
         printf("%s\n", response->Stringify().c_str());
         printf("\n");
      }
 
      return response;
   }
 
   double start_time = 0;
 
   if (mjsonrpc_time) {
      start_time = GetTimeSec();
   }
 
   const std::string ms = method->GetString();
   const char* m = ms.c_str();
 
   MJsonNode* result = NULL;
 
   // special built-in methods
 
   if (strcmp(m, "echo") == 0) {
      result = mjsonrpc_make_result(request->Copy());
   } else if (strcmp(m, "error") == 0) {
      result = mjsonrpc_make_error(1, "test error", "test error");
   } else if (strcmp(m, "invalid_json") == 0) {
      if (mjsonrpc_debug) {
         printf("mjsonrpc: reply with invalid json\n");
      }
      return MJsonNode::MakeJSON("this is invalid json data");
   } else if (strcmp(m, "test_nan_inf") == 0) {
      double one = 1;
      double zero = 0;
      double nan = zero/zero;
      double plusinf = one/zero;
      double minusinf = -one/zero;
      MJsonNode* n = MJsonNode::MakeArray();
      n->AddToArray(MJsonNode::MakeNumber(nan));
      n->AddToArray(MJsonNode::MakeNumber(plusinf));
      n->AddToArray(MJsonNode::MakeNumber(minusinf));
      result = mjsonrpc_make_result("test_nan_plusinf_minusinf", n);
   } else if (strcmp(m, "test_arraybuffer") == 0) {
      if (mjsonrpc_debug) {
         printf("mjsonrpc: reply with test arraybuffer data\n");
      }
      size_t size = 32;
      char* ptr = (char*)malloc(size);
      for (size_t i=0; i<size; i++) {
         ptr[i] = 'A' + i;
      }
      *((short*)(ptr+4*2*1)) = 111; // int16[4]
      *((int*)(ptr+4*2*2)) = 1234; // int32[4]
      *((double*)(ptr+4*2*3)) = 3.14; // float64[3]
      return MJsonNode::MakeArrayBuffer(ptr, size);
   } else {
      MethodsTableIterator s = gMethodsTable.find(ms);
      if (s != gMethodsTable.end()) {
         bool lock = s->second.fNeedsLocking;
         if (lock && gMutex)
            gMutex->lock();
         result = s->second.fHandler(params);
         if (lock && gMutex)
            gMutex->unlock();
      } else {
         result = mjsonrpc_make_error(-32601, "Method not found", (std::string("unknown method: ") + ms).c_str());
      }
   }
 
   if (mjsonrpc_debug) {
      printf("mjsonrpc: handler reply:\n");
      result->Dump();
      printf("\n");
   }
 
   double end_time = 0;
   double elapsed_time = 0;
   if (mjsonrpc_time) {
      end_time = GetTimeSec();
      elapsed_time = end_time - start_time;
      if (mjsonrpc_time > 1) {
         printf("request took %.3f seconds, method [%s]\n", elapsed_time, m);
      }
   }
 
   if (result->GetType() == MJSON_ARRAYBUFFER) {
      return result;
   }
   
   const MJsonNode *nerror  = result->FindObjectNode("error");
   const MJsonNode *nresult = result->FindObjectNode("result");
 
   if (nerror) {
      result->DeleteObjectNode("result");
   } else if (nresult) {
      result->DeleteObjectNode("error");
   } else {
      delete result;
      result = mjsonrpc_make_error(-32603, "Internal error", "bad dispatcher reply: no result and no error");
   }
 
   result->AddToObject("jsonrpc", MJsonNode::MakeString("2.0"));
 
   if (id) {
      result->AddToObject("id", id->Copy());
   } else {
      result->AddToObject("id", MJsonNode::MakeNull());
   }
 
   if (mjsonrpc_time) {
      result->AddToObject("elapsed_time", MJsonNode::MakeNumber(elapsed_time));
   }
 
   assert(result != NULL);
 
   return result;
}
 
MJsonNode* mjsonrpc_decode_post_data(const char* post_data)
{
   //printf("mjsonrpc call, data [%s]\n", post_data);
   MJsonNode *request = MJsonNode::Parse(post_data);
 
   assert(request != NULL); // Parse never returns NULL - either parsed data or an MJSON_ERROR node
 
   if (mjsonrpc_debug) {
      printf("mjsonrpc: request:\n");
      request->Dump();
      printf("\n");
   }
 
   if (mjsonrpc_sleep) {
      if (mjsonrpc_debug) {
         printf("mjsonrpc: sleep %d\n", mjsonrpc_sleep);
      }
      for (int i=0; i<mjsonrpc_sleep; i++) {
         sleep(1);
      }
   }
 
   if (request->GetType() == MJSON_ERROR) {
      MJsonNode* reply = mjsonrpc_make_error(-32700, "Parse error", request->GetError().c_str());
      reply->AddToObject("jsonrpc", MJsonNode::MakeString("2.0"));
      reply->AddToObject("id", MJsonNode::MakeNull());
 
      if (mjsonrpc_debug) {
         printf("mjsonrpc: invalid json: reply:\n");
         printf("%s\n", reply->Stringify().c_str());
         printf("\n");
      }
 
      delete request;
      return reply;
   } else if (request->GetType() == MJSON_OBJECT) {
      MJsonNode* reply = mjsonrpc_handle_request(request);
      delete request;
      return reply;
   } else if (request->GetType() == MJSON_ARRAY) {
      const MJsonNodeVector* a = request->GetArray();
 
      if (a->size() < 1) {
         MJsonNode* reply = mjsonrpc_make_error(-32600, "Invalid request", "batch request array has less than 1 element");
         reply->AddToObject("jsonrpc", MJsonNode::MakeString("2.0"));
         reply->AddToObject("id", MJsonNode::MakeNull());
         
         if (mjsonrpc_debug) {
            printf("mjsonrpc: invalid json: reply:\n");
            printf("%s\n", reply->Stringify().c_str());
            printf("\n");
         }
         
         delete request;
         return reply;
      }
 
      MJsonNode* reply = MJsonNode::MakeArray();
 
      for (unsigned i=0; i<a->size(); i++) {
         MJsonNode* r = mjsonrpc_handle_request(a->at(i));
         reply->AddToArray(r);
         if (r->GetType() == MJSON_ARRAYBUFFER) {
            delete request;
            delete reply;
            reply = mjsonrpc_make_error(-32600, "Invalid request", "MJSON_ARRAYBUFFER return is not permitted for batch requests");
            reply->AddToObject("jsonrpc", MJsonNode::MakeString("2.0"));
            reply->AddToObject("id", MJsonNode::MakeNull());
            return reply;
         }
      }
 
      delete request;
      return reply;
   } else {
      MJsonNode* reply = mjsonrpc_make_error(-32600, "Invalid request", "request is not a JSON object or JSON array");
      reply->AddToObject("jsonrpc", MJsonNode::MakeString("2.0"));
      reply->AddToObject("id", MJsonNode::MakeNull());
 
      if (mjsonrpc_debug) {
         printf("mjsonrpc: invalid json: reply:\n");
         printf("%s\n", reply->Stringify().c_str());
         printf("\n");
      }
 
      delete request;
      return reply;
   }
}
 
/* emacs
 * Local Variables:
 * tab-width: 8
 * c-basic-offset: 3
 * indent-tabs-mode: nil
 * End:
 */