From ea5594186bafa5489d6086a26d71b8f3d1ccf9cd Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Fri, 13 Jan 2017 11:53:15 +0100
Subject: Add threaded UDP input for EDI

---
 lib/UdpSocket.cpp | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 60 insertions(+), 2 deletions(-)

(limited to 'lib/UdpSocket.cpp')

diff --git a/lib/UdpSocket.cpp b/lib/UdpSocket.cpp
index 981d713..b88c731 100644
--- a/lib/UdpSocket.cpp
+++ b/lib/UdpSocket.cpp
@@ -167,8 +167,7 @@ int UdpSocket::send(const std::vector<uint8_t>& data, InetAddress destination)
 
 /**
  *  Must be called to receive data on a multicast address.
- *  @param groupname The multica
-st address to join.
+ *  @param groupname The multicast address to join.
  *  @return 0 if ok, -1 if error
  */
 int UdpSocket::joinGroup(char* groupname)
@@ -254,3 +253,62 @@ InetAddress UdpPacket::getAddress()
     return address;
 }
 
+UdpReceiver::~UdpReceiver() {
+    m_stop = true;
+    m_sock.close();
+    if (m_thread.joinable()) {
+        m_thread.join();
+    }
+}
+
+void UdpReceiver::start(int port) {
+    m_port = port;
+    m_thread = std::thread(&UdpReceiver::m_run, this);
+}
+
+std::vector<uint8_t> UdpReceiver::get_packet_buffer()
+{
+    if (m_stop) {
+        throw runtime_error("UDP Receiver not running");
+    }
+
+    UdpPacket p;
+    m_packets.wait_and_pop(p);
+
+    return p.getBuffer();
+}
+
+void UdpReceiver::m_run()
+{
+    // Ensure that stop is set to true in case of exception or return
+    struct SetStopOnDestruct {
+        SetStopOnDestruct(atomic<bool>& stop) : m_stop(stop) {}
+        ~SetStopOnDestruct() { m_stop = true; }
+        private: atomic<bool>& m_stop;
+    } autoSetStop(m_stop);
+
+    m_sock.reinit(m_port, "0.0.0.0");
+
+    const size_t packsize = 8192;
+    UdpPacket packet(packsize);
+
+    while (not m_stop) {
+        int ret = m_sock.receive(packet);
+        if (ret == 0) {
+            if (packet.getSize() == packsize) {
+                // TODO replace fprintf
+                fprintf(stderr, "Warning, possible UDP truncation\n");
+            }
+            m_packets.push(packet);
+        }
+        else
+        {
+            if (inetErrNo != EINTR) {
+                // TODO replace fprintf
+                fprintf(stderr, "Socket error: %s\n", inetErrMsg);
+            }
+            m_stop = true;
+        }
+    }
+}
+
-- 
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