Extend sf_buffer with streaming capabilities

sf-buffer/src/sf_buffer.cpp

@@ -3,7 +3,7 @@
 #include <RingBuffer.hpp>
 #include <UdpRecvModule.hpp>
 #include <FastH5Writer.hpp>
-
+#include "zmq.h"
 #include "buffer_config.hpp"
 #include "jungfrau.hpp"
 
@@ -16,10 +16,12 @@ int main (int argc, char *argv[]) {
     if (argc != 4) {
         cout << endl;
         cout << "Usage: sf_buffer [device_name] [udp_port] [root_folder]";
+        cout << "[source_id]";
         cout << endl;
         cout << "\tdevice_name: Name to write to disk.";
         cout << "\tudp_port: UDP port to connect to." << endl;
         cout << "\troot_folder: FS root folder." << endl;
+        cout << "\tsource_id: ID of the source for live stream." << endl;
         cout << endl;
 
         exit(-1);
@@ -28,6 +30,25 @@ int main (int argc, char *argv[]) {
     string device_name = string(argv[1]);
     int udp_port = atoi(argv[2]);
     string root_folder = string(argv[3]);
+    int source_id = atoi(argv[2]);
+
+    stringstream ipc_stream;
+    ipc_stream << "ipc://sf-live-" << source_id;
+    const auto ipc_address = ipc_stream.str();
+
+    auto ctx = zmq_ctx_new();
+    auto socket = zmq_socket(ctx, ZMQ_PUB);
+
+    const int sndhwm = BUFFER_LIVE_SEND_HWM;
+    if (zmq_setsockopt(socket, ZMQ_SNDHWM, &sndhwm, sizeof(sndhwm)) != 0)
+        throw runtime_error(strerror (errno));
+
+    const int linger_ms = 0;
+    if (zmq_setsockopt(socket, ZMQ_LINGER, &linger_ms, sizeof(linger_ms)) != 0)
+        throw runtime_error(strerror (errno));
+
+    if (zmq_connect(socket, ipc_address.c_str()) != 0)
+        throw runtime_error(strerror (errno));
 
     RingBuffer<UdpFrameMetadata> ring_buffer(BUFFER_RB_SIZE);
 
@@ -78,6 +99,24 @@ int main (int argc, char *argv[]) {
                 "received_packets",
                 &(data.first->n_recv_packets));
 
+        ModuleFrame metadata = {
+                metadata.pulse_id,
+                metadata.frame_index,
+                metadata.daq_rec,
+                metadata.n_received_packets,
+                (uint16_t) source_id
+        };
+
+        zmq_send(socket,
+                 &metadata,
+                 sizeof(ModuleFrame),
+                 ZMQ_SNDMORE);
+
+        zmq_send(socket,
+                 data.second,
+                 MODULE_N_BYTES,
+                 0);
+
         ring_buffer.release(data.first->buffer_slot_index);
 
         // TODO: Make real statistics, please.