(cobra client) send a websocket ping every 30s to keep the connection opened

docs/CHANGELOG.md

@@ -1,13 +1,16 @@
 # Changelog
 All changes to this project will be documented in this file.
 
+## [7.6.5] - 2019-12-24
+
+(cobra client) send a websocket ping every 30s to keep the connection opened
+
 ## [7.6.4] - 2019-12-22
 
 (client) error handling, quote url in error case when failing to parse one
 (ws) ws_cobra_publish: register callbacks before connecting
 (doc) mention mbedtls in supported ssl server backend
 
-
 ## [7.6.3] - 2019-12-20
 
 (tls) add a simple description of the TLS configuration routine for debugging

ixcobra/ixcobra/IXCobraConnection.cpp

@@ -24,6 +24,7 @@ namespace ix
     PublishTrackerCallback CobraConnection::_publishTrackerCallback = nullptr;
     constexpr size_t CobraConnection::kQueueMaxSize;
     constexpr CobraConnection::MsgId CobraConnection::kInvalidMsgId;
+    constexpr int CobraConnection::kPingIntervalSecs;
 
     CobraConnection::CobraConnection() :
         _webSocket(new WebSocket()),
@@ -228,6 +229,10 @@ namespace ix
                     ss << "HTTP Status: "      << msg->errorInfo.http_status << std::endl;
                     invokeErrorCallback(ss.str(), std::string());
                 }
+                else if (msg->type == ix::WebSocketMessageType::Pong)
+                {
+                    invokeEventCallback(ix::CobraConnection_EventType_Pong);
+                }
         });
     }
 
@@ -260,6 +265,7 @@ namespace ix
         _webSocket->setUrl(url);
         _webSocket->setPerMessageDeflateOptions(webSocketPerMessageDeflateOptions);
         _webSocket->setTLSOptions(socketTLSOptions);
+        _webSocket->setPingInterval(kPingIntervalSecs);
     }
 
     //

ixcobra/ixcobra/IXCobraConnection.h

@@ -30,7 +30,8 @@ namespace ix
         CobraConnection_EventType_Closed = 3,
         CobraConnection_EventType_Subscribed = 4,
         CobraConnection_EventType_UnSubscribed = 5,
-        CobraConnection_EventType_Published = 6
+        CobraConnection_EventType_Published = 6,
+        CobraConnection_EventType_Pong = 7
     };
 
     enum CobraConnectionPublishMode
@@ -215,6 +216,9 @@ namespace ix
 
         // Each pdu sent should have an incremental unique id
         std::atomic<uint64_t> _id;
+
+        // Frequency at which we send a websocket ping to the backing cobra connection
+        static constexpr int kPingIntervalSecs = 30;
     };
 
 } // namespace ix

ixcobra/ixcobra/IXCobraMetricsThreadedPublisher.cpp

@@ -65,6 +65,10 @@ namespace ix
                 {
                     ss << "Published message " << msgId << " acked";
                 }
+                else if (eventType == ix::CobraConnection_EventType_Pong)
+                {
+                    ss << "Received websocket pong";
+                }
 
                 ix::IXCoreLogger::Log(ss.str().c_str());
         });

ixwebsocket/IXWebSocketVersion.h

@@ -6,4 +6,4 @@
 
 #pragma once
 
-#define IX_WEBSOCKET_VERSION "7.6.4"
+#define IX_WEBSOCKET_VERSION "7.6.5"

ws/ws_cobra_publish.cpp

@@ -91,6 +91,10 @@ namespace ix
                 spdlog::info("Published message id {} acked", msgId);
                 messageAcked = true;
             }
+            else if (eventType == ix::CobraConnection_EventType_Pong)
+            {
+                spdlog::info("Received websocket pong");
+            }
         });
 
         conn.connect();

ws/ws_cobra_subscribe.cpp

@@ -100,6 +100,10 @@ namespace ix
                 {
                     spdlog::error("Published message hacked: {}", msgId);
                 }
+                else if (eventType == ix::CobraConnection_EventType_Pong)
+                {
+                    spdlog::info("Received websocket pong");
+                }
             });
 
         while (true)

ws/ws_cobra_to_sentry.cpp

@@ -245,6 +245,10 @@ namespace ix
             {
                 spdlog::error("Published message hacked: {}", msgId);
             }
+            else if (eventType == ix::CobraConnection_EventType_Pong)
+            {
+                spdlog::info("Received websocket pong");
+            }
         });
 
         while (true)

ws/ws_cobra_to_statsd.cpp

@@ -160,6 +160,10 @@ namespace ix
             {
                 spdlog::error("Published message hacked: {}", msgId);
             }
+            else if (eventType == ix::CobraConnection_EventType_Pong)
+            {
+                spdlog::info("Received websocket pong");
+            }
         });
 
         while (true)