From 9a1f5fa40020247ed25fbe553d2ce71fa53d9e95 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Wed, 11 Apr 2018 15:52:08 +0200
Subject: Add ZMQ input buffer size to RC

---
 src/InputZeroMQReader.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

(limited to 'src/InputZeroMQReader.cpp')

diff --git a/src/InputZeroMQReader.cpp b/src/InputZeroMQReader.cpp
index c7dfd84..f6c3c34 100644
--- a/src/InputZeroMQReader.cpp
+++ b/src/InputZeroMQReader.cpp
@@ -66,6 +66,13 @@ struct zmq_dab_message_t
 #define ZMQ_DAB_MESSAGE_T_HEADERSIZE \
     (sizeof(uint32_t) + NUM_FRAMES_PER_ZMQ_MESSAGE*sizeof(uint16_t))
 
+InputZeroMQReader::InputZeroMQReader() :
+    InputReader(),
+    RemoteControllable("inputzmq")
+{
+    RC_ADD_PARAMETER(buffer, "Size of input buffer [us] (read-only)");
+}
+
 InputZeroMQReader::~InputZeroMQReader()
 {
     m_running = false;
@@ -125,6 +132,10 @@ int InputZeroMQReader::GetNextFrame(void* buffer)
         return 0;
     }
     else if (incoming.size() == framesize) {
+        unique_lock<mutex> lock(m_last_in_messages_size_mutex);
+        m_last_in_messages_size--;
+        lock.unlock();
+
         memcpy(buffer, &incoming.front(), framesize);
     }
     else {
@@ -242,6 +253,9 @@ void InputZeroMQReader::RecvProcess()
 
                             queue_size = m_in_messages.push(move(buf));
                             etiLog.log(trace, "ZMQ,push %zu", queue_size);
+
+                            unique_lock<mutex> lock(m_last_in_messages_size_mutex);
+                            m_last_in_messages_size++;
                         }
                     }
                 }
@@ -286,5 +300,43 @@ void InputZeroMQReader::RecvProcess()
     m_in_messages.notify();
 }
 
+// =======================================
+// Remote Control
+// =======================================
+void InputZeroMQReader::set_parameter(const string& parameter, const string& value)
+{
+    stringstream ss(value);
+    ss.exceptions ( stringstream::failbit | stringstream::badbit );
+
+    if (parameter == "buffer") {
+        throw ParameterError("Parameter " + parameter + " is read-only.");
+    }
+    else {
+        stringstream ss_err;
+        ss_err << "Parameter '" << parameter
+            << "' is not exported by controllable " << get_rc_name();
+        throw ParameterError(ss_err.str());
+    }
+}
+
+const string InputZeroMQReader::get_parameter(const string& parameter) const
+{
+    stringstream ss;
+    ss << std::fixed;
+    if (parameter == "buffer") {
+        // Do not use size of the queue, as it will contain empty
+        // frames to signal timeouts
+        unique_lock<mutex> lock(m_last_in_messages_size_mutex);
+        const long time_in_buffer_us = 24000 * m_last_in_messages_size;
+        ss << time_in_buffer_us;
+    }
+    else {
+        ss << "Parameter '" << parameter <<
+            "' is not exported by controllable " << get_rc_name();
+        throw ParameterError(ss.str());
+    }
+    return ss.str();
+}
+
 #endif
 
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