Mjsonrpc

JSON-RPC general information

This page is a placeholder for the documentation of the MIDAS JSON RPC interface.

test

Javascript client library

MIDAS provides a simple client library: https://daq.triumf.ca/~daqweb/doc/midas-devel/resources/mhttpd.js https://daq.triumf.ca/~daqweb/doc/midas-devel/html/

Examples

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","id":null,"method":"db_get_values","params":{"paths":["/runinfo/run number"]}}' 'http://localhost:8080?mjsonrpc'
{"jsonrpc": "2.0","result":{"data":[324],"status":[1],"last_written":[1443570804]},"id":null}
$ 

Schema (List of all RPC methods)

------------------------------------------------------------------------
Autogenerated schema for all MIDAS JSON-RPC methods
------------------------------------------------------------------------
cm_exist?      | calls MIDAS cm_exist() to check if given MIDAS program is running
               | -------------------------------------------------------
               | params   | name           | string         | name of the program, corresponding to ODB /Programs/name
               |          | unique?        | bool           | bUnique argument to cm_exist()
               | -------------------------------------------------------
               | result   | status         | integer        | return status of cm_exist()
------------------------------------------------------------------------
cm_shutdown?   | calls MIDAS cm_shutdown() to stop given MIDAS program
               | -------------------------------------------------------
               | params   | name           | string         | name of the program, corresponding to ODB /Programs/name
               |          | unique?        | bool           | bUnique argument to cm_shutdown()
               | -------------------------------------------------------
               | result   | status         | integer        | return status of cm_shutdown()
------------------------------------------------------------------------
db_copy?       | get copies of given ODB subtrees in the "save" json encoding
               | -------------------------------------------------------
               | params   | paths[]        | array of ODB subtree paths, see note on array indices
               |          |                | array of       | string 
               | -------------------------------------------------------
               | result   | data[]         | copy of ODB data for each path
               |          |                | array of       | object 
               |          | status[]       | return status of db_copy_json() for each path
               |          |                | array of       | integer
               |          | last_written[] | last_written value of the ODB subtree for each path
               |          |                | array of       | number 
------------------------------------------------------------------------
db_create?     | get copies of given ODB subtrees in the "save" json encoding
               | -------------------------------------------------------
               | params[] | array of ODB paths to be created
               |          | array of       | arguments to db_create() and db_resize()
               |          |                | path           | string  | ODB path
               |          |                | type           | integer | MIDAS TID_xxx type
               |          |                | array_length?  | integer | optional array length, default is 1
               |          |                | string_length? | integer | for TID_STRING, optional string length, default is NAME_LENGTH
               | -------------------------------------------------------
               | result   | status[]       | return status of db_create() for each path
               |          |                | array of       | integer
------------------------------------------------------------------------
db_get_values? | get values of ODB data from given subtrees
               | -------------------------------------------------------
               | params   | paths[]        | array of ODB subtree paths, see note on array indices
               |          |                | array of       | string 
               | -------------------------------------------------------
               | result   | data[]         | values of ODB data for each path, all key names are in lower case, all symlinks are followed
               |          |                | array of       | any    
               |          | status[]       | return status of db_copy_json() for each path
               |          |                | array of       | integer
               |          | last_written[] | last_written value of the ODB subtree for each path
               |          |                | array of       | number 
------------------------------------------------------------------------
db_paste?      | write data into ODB
               | -------------------------------------------------------
               | params   | paths[]        | array of ODB subtree paths, see note on array indices
               |          |                | array of       | string 
               |          | values[]       | data to be written using db_paste_json()
               |          |                | array of       | any    
               | -------------------------------------------------------
               | result   | status[]       | return status of db_paste_json() for each path
               |          |                | array of       | integer
------------------------------------------------------------------------
get_debug?     | get current value of mjsonrpc_debug
               | -------------------------------------------------------
               | params   | any            | there are no input parameters
               | -------------------------------------------------------
               | result   | integer        | current value of mjsonrpc_debug
------------------------------------------------------------------------
get_schema?    | Get the MIDAS JSON-RPC schema JSON object
               | -------------------------------------------------------
               | params   | any            | there are no input parameters
               | -------------------------------------------------------
               | result   | object         | returns the MIDAS JSON-RPC schema JSON object
------------------------------------------------------------------------
null?          | RPC method always returns null
               | -------------------------------------------------------
               | params   | any            | method parameters are ignored
               | -------------------------------------------------------
               | result   | null           | always returns null
------------------------------------------------------------------------
set_debug?     | set new value of mjsonrpc_debug
               | -------------------------------------------------------
               | params   | integer        | new value of mjsonrpc_debug
               | -------------------------------------------------------
               | result   | integer        | new value of mjsonrpc_debug
------------------------------------------------------------------------
start_program? | start MIDAS program defined in ODB /Programs/name
               | -------------------------------------------------------
               | params   | name           | string         | name of the program, corresponding to ODB /Programs/name
               | -------------------------------------------------------
               | result   | status         | integer        | return status of ss_system()
------------------------------------------------------------------------
user_example1? | example of user defined RPC method that returns up to 3 results
               | -------------------------------------------------------
               | params   | arg            | string         | example string argment
               |          | optional_arg?  | integer        | optional example integer argument
               | -------------------------------------------------------
               | result   | string         | string         | returns the value of "arg" parameter
               |          | integer        | integer        | returns the value of "optional_arg" parameter
------------------------------------------------------------------------
user_example2? | example of user defined RPC method that returns more than 3 results
               | -------------------------------------------------------
               | params   | arg            | string         | example string argment
               |          | optional_arg?  | integer        | optional example integer argument
               | -------------------------------------------------------
               | result   | string1        | string         | returns the value of "arg" parameter
               |          | string2        | string         | returns "hello"
               |          | string3        | string         | returns "world!"
               |          | value1         | integer        | returns the value of "optional_arg" parameter
               |          | value2         | number         | returns 3.14
------------------------------------------------------------------------
user_example3? | example of user defined RPC method that returns an error
               | -------------------------------------------------------
               | params   | arg            | integer        | integer value, if zero, throws a JSON-RPC error
               | -------------------------------------------------------
               | result   | status         | integer        | returns the value of "arg" parameter