If there's some template for writing a client to access event data, that would be 
very useful (and you can probably just ignore the context I gave below in that 
case).


Some context:

Quite a while ago, I wrote the attached "data pipeline" client whose job was to 
listen for events, copy their data, and pipe them to a python script. I believe I 
just stole bits and pieces from mdump.cxx to accomplish this. Later I wrote the 
attached wrapper class "MidasConnector.cpp" and a main.cpp to generalize
data_pipeline.cxx a bit. There were a lot of iterations to the code where I had the 
below problems; so don't take the logic in the attached code as the exact code that 
caused the issues below.

However, I'm unable to resolve a couple issues:

1. If a timeout is set, everything will work until that timeout is reached. Then 
regardless of what kind of logic I tried to implement (retry receiving event, 
disconnect and reconnect client, etc.) the client would refuse to receive more data.

2. When I ctrl-C main, it hangs; this is expected because it's stuck in a while 
loop. But because I can't set a timeout I have to ctrl-C twice; this would 
occasionally corrupt the ODB which was not ideal. I was able to get around this with 
some impractical solution involving ncurses I believe.


Thanks,
Jack

#include "midas.h"
#include "msystem.h"
#include "mrpc.h"
#include "mdsupport.h"
#include <iostream>
#include <unistd.h>
#include <stdio.h>  // Added for popen
#include <stdlib.h> // Added for malloc and free

INT hBufEvent;

void process_event(EVENT_HEADER *pheader) {
    printf("Received event #%d\n", pheader->serial_number);
    printf("Event ID: %d\n", pheader->event_id);
    printf("Data Size: %d bytes\n", pheader->data_size);
    printf("Timestamp: %d\n", pheader->time_stamp);
    printf("Trigger mask: %d\n", pheader->trigger_mask);

    // Print a marker to indicate the start of serialized data
    printf("EVENT_DATA_START\n");

    // Serialize and print the event data
    int* eventData = (int*)((char*)pheader + sizeof(EVENT_HEADER));
    int numIntegers = (pheader->data_size - sizeof(EVENT_HEADER)) / sizeof(int);
    for (int i = 0; i < 8; ++i) {
        printf("%d ", eventData[i]);
    }
    printf("\n");

    // Process the event here
}

int main() {
    HNDLE hDB, hKey;
    char host_name[HOST_NAME_LENGTH], expt_name[NAME_LENGTH], str[80];
    char buf_name[32] = EVENT_BUFFER_NAME, rep_file[128];
    unsigned int status, start_time, stop_time;
    INT ch, request_id, size, get_flag, action, single, i;

    // Define the maximum event size you expect to receive
    INT max_event_size = 4000;

    // Allocate memory for storing event data dynamically
    void* event_data = malloc(max_event_size);

    printf("1\n");
    /* Get if existing the pre-defined experiment */
    cm_get_environment(host_name, sizeof(host_name), expt_name, sizeof(expt_name));
    // Print host_name
    printf("host_name = %s\n", host_name);

    // Print expt_name
    printf("expt_name = %s\n", expt_name);

    printf("2\n");
    /* connect to the experiment */
    status = cm_connect_experiment(host_name, expt_name, "data_pipeline", 0);
    if (status != CM_SUCCESS) {
        return 1;
    }
    printf("3\n");

    status = bm_open_buffer(buf_name, DEFAULT_BUFFER_SIZE, &hBufEvent);
    if (status != BM_SUCCESS && status != BM_CREATED) {
        cm_msg(MERROR, "data_pipeline", "Cannot open buffer \"%s\", bm_open_buffer() status %d", buf_name, status);
        return 1;
    }
    printf("4\n");
    /* set the buffer cache size if requested */
    bm_set_cache_size(hBufEvent, 100000, 0);
    printf("5\n");

    /* place a request for a specific event id */
    status = bm_request_event(hBufEvent, EVENTID_ALL, TRIGGER_ALL, GET_ALL, &request_id, NULL); // Use NULL as the callback routine
    printf("6\n");
    printf("status = %d\n",status);
    // Open a pipe to a Python script for data transfer
    FILE* pipe = popen("python3 data_pipeline.py", "w");
    if (pipe == NULL) {
        perror("popen");
        return 1;
    }

    // Enter the event processing loop
    while (1) {
        // Use the address of max_event_size in bm_receive_event
        status = bm_receive_event(hBufEvent, event_data, &max_event_size, BM_WAIT); // Wait for new data indefinitely

        if (status == BM_SUCCESS) {
            //process_event((EVENT_HEADER*)((char*)event_data + sizeof(EVENT_HEADER)));
            // Send the event data to the Python script via the pipe
            fprintf(pipe, "EVENT_DATA_START\n");
            int* eventData = (int*)((char*)event_data + sizeof(EVENT_HEADER));
            int numIntegers = (max_event_size - sizeof(EVENT_HEADER)) / sizeof(int);
            for (int i = 4; i < 12; ++i) {
                fprintf(pipe, "%d ", eventData[i]);
            }
            fprintf(pipe, "\n");
            fflush(pipe); // Flush the buffer to ensure data is sent immediately
        } else {
            printf("Error receiving event: %d\n", status);
            break; // Exit the loop if an error occurs
        }
    }

    // Close the pipe
    pclose(pipe);

    // Free the dynamically allocated memory
    free(event_data);

    cm_disconnect_experiment();

    printf("7\n");
    return 1;
}

#include "event_processor/EventProcessor.h"
#include "data_transmitter/DataTransmitter.h"
#include "midas_connector/MidasConnector.h"
#include "json.hpp"
#include <fstream>

INT hBufEvent1;
INT hBufEvent2;

// Function to initialize MIDAS and open an event buffer
bool initializeMidas(MidasConnector& midasConnector, const nlohmann::json& config) {
    // Set the MidasConnector properties based on the config
    midasConnector.setEventId(config["eventId"].get<short>());
    midasConnector.setTriggerMask(config["triggerMask"].get<short>());
    midasConnector.setSamplingType(config["samplingType"].get<int>());
    midasConnector.setBufferSize(config["bufferSize"].get<int>());
    midasConnector.setBufferName(config["bufferName"].get<std::string>().c_str());
    midasConnector.setBufferSize(config["bufferSize"].get<int>());

    // Call the ConnectToExperiment method
    if (!midasConnector.ConnectToExperiment()) {
        return false;
    }

    // Call the OpenEventBuffer method
    if (!midasConnector.OpenEventBuffer()) {
        return false;
    }

    // Set the buffer cache size if requested
    midasConnector.SetCacheSize(config["cacheSize"].get<int>());

    // Place a request for a specific event id
    if (!midasConnector.RequestEvent()) {
        return false;
    }

    return true;
}

int main() {
    // Read configuration from a JSON file
    nlohmann::json config;
    std::ifstream configFile("config.json");
    configFile >> config;
    configFile.close();

    // Initialize MidasConnector and connect to the MIDAS experiment
    MidasConnector midasConnector(config["clientName"].get<std::string>().c_str());
    if (!initializeMidas(midasConnector, config)) {
        printf("Error: Failed to initialize MIDAS.\n");
        return 1;
    }

    // Read the maximum event size from the JSON configuration
    INT max_event_size = config["maxEventSize"].get<int>();

    // Allocate memory for storing event data dynamically
    void* event_data = malloc(max_event_size);

    // Initialize EventProcessor with detector mapping file and verbosity flag
    EventProcessor eventProcessor(config["detectorMappingFile"].get<std::string>(), config["verbose"].get<bool>());

    // Initialize DataTransmitter with the ZeroMQ address
    DataTransmitter dataPublisher(config["zmqAddress"].get<std::string>());

    // Connect to the ZeroMQ server
    if (!dataPublisher.bind()) {
        // Handle connection error
        printf("Error: Failed to bind to port %s.\n", config["zmqAddress"].get<std::string>().c_str());
        return 1;
    } else {
        printf("Connected to the ZeroMQ server.\n");
    }


    // Event processing loop
    while (true) {

        midasConnector.ReceiveEvent(event_data, max_event_size);

        //Prcoess data once we have it
        eventProcessor.processEvent(event_data, max_event_size);

        // Serialize the event data with EventProcessor and store it in serializedData
        std::string serializedData = eventProcessor.getSerializedData();

        // Send the serialized data to the ZeroMQ server with DataTransmitter
        if (!dataPublisher.publish(serializedData)) {
            // Handle send error
            printf("Error: Failed to send serialized data.\n");
        }
    }

    // Cleanup and finalize your application
    midasConnector.DisconnectFromExperiment(); // Disconnect from the MIDAS experiment

    return 0;
}