Implement a Logging Sink for WebRTC

WebRTC logs now pass out of the webrtc library into a logging sink,
which converts them into SecondLife.log compatable logging calls.

This includes fatal errors and asserts, which are now logged into
SecondLife.log, and should be available in the crash logger.

3 files changed, 76 insertions, 6 deletions

diff --git a/indra/llwebrtc/llwebrtc.cpp b/indra/llwebrtc/llwebrtc.cpp
index 6dc632aba4..2c890acbdb 100644
--- a/indra/llwebrtc/llwebrtc.cpp
+++ b/indra/llwebrtc/llwebrtc.cpp
@@ -154,7 +154,8 @@ void LLCustomProcessor::Process(webrtc::AudioBuffer *audio_in)
 // LLWebRTCImpl implementation
 //
 
-LLWebRTCImpl::LLWebRTCImpl() :
+LLWebRTCImpl::LLWebRTCImpl(LLWebRTCLogCallback* logCallback) :
+    mLogSink(new LLWebRTCLogSink(logCallback)),
     mPeerCustomProcessor(nullptr),
     mMute(true),
     mTuningMode(false),
@@ -173,6 +174,7 @@ void LLWebRTCImpl::init()
     // Normal logging is rather spammy, so turn it off.
     rtc::LogMessage::LogToDebug(rtc::LS_NONE);
     rtc::LogMessage::SetLogToStderr(true);
+    rtc::LogMessage::AddLogToStream(mLogSink, rtc::LS_VERBOSE);
 
     mTaskQueueFactory = webrtc::CreateDefaultTaskQueueFactory();
 
@@ -312,6 +314,7 @@ void LLWebRTCImpl::terminate()
             mPeerDeviceModule   = nullptr;
             mTaskQueueFactory   = nullptr;
         });
+    rtc::LogMessage::RemoveLogToStream(mLogSink);
 }
 
 //
@@ -1327,9 +1330,9 @@ void freePeerConnection(LLWebRTCPeerConnectionInterface* peer_connection)
 }
 
 
-void init()
+void init(LLWebRTCLogCallback* logCallback)
 {
-    gWebRTCImpl = new LLWebRTCImpl();
+    gWebRTCImpl = new LLWebRTCImpl(logCallback);
     gWebRTCImpl->init();
 }
 
diff --git a/indra/llwebrtc/llwebrtc.h b/indra/llwebrtc/llwebrtc.h
index 54eefc8554..c6fdb909dd 100644
--- a/indra/llwebrtc/llwebrtc.h
+++ b/indra/llwebrtc/llwebrtc.h
@@ -56,6 +56,20 @@
 namespace llwebrtc
 {
 
+class LLWebRTCLogCallback
+{
+public:
+    typedef enum {
+        LOG_LEVEL_VERBOSE = 0,
+        LOG_LEVEL_INFO,
+        LOG_LEVEL_WARNING,
+        LOG_LEVEL_ERROR
+    } LogLevel;
+
+    virtual void LogMessage(LogLevel level, const std::string& message) = 0;
+};
+
+
 // LLWebRTCVoiceDevice is a simple representation of the
 // components of a device, used to communicate this
 // information to the viewer.
@@ -262,7 +276,7 @@ class LLWebRTCPeerConnectionInterface
 // exports.
 
 // This library must be initialized before use.
-LLSYMEXPORT void init();
+LLSYMEXPORT void init(LLWebRTCLogCallback* logSink);
 
 // And should be terminated as part of shutdown.
 LLSYMEXPORT void terminate();
diff --git a/indra/llwebrtc/llwebrtc_impl.h b/indra/llwebrtc/llwebrtc_impl.h
index 2fb5525519..c5b32123eb 100644
--- a/indra/llwebrtc/llwebrtc_impl.h
+++ b/indra/llwebrtc/llwebrtc_impl.h
@@ -69,6 +69,54 @@ namespace llwebrtc
 
 class LLWebRTCPeerConnectionImpl;
 
+class LLWebRTCLogSink : public rtc::LogSink {
+public:
+    LLWebRTCLogSink(LLWebRTCLogCallback* callback) :
+    mCallback(callback)
+    {
+    }
+
+    // Destructor: close the log file
+    ~LLWebRTCLogSink() override
+    {
+    }
+
+    void OnLogMessage(const std::string& msg,
+                      rtc::LoggingSeverity severity) override
+    {
+        if (mCallback)
+        {
+            switch(severity)
+            {
+                case rtc::LS_VERBOSE:
+                    mCallback->LogMessage(LLWebRTCLogCallback::LOG_LEVEL_VERBOSE, msg);
+                    break;
+                case rtc::LS_INFO:
+                    mCallback->LogMessage(LLWebRTCLogCallback::LOG_LEVEL_VERBOSE, msg);
+                    break;
+                case rtc::LS_WARNING:
+                    mCallback->LogMessage(LLWebRTCLogCallback::LOG_LEVEL_VERBOSE, msg);
+                    break;
+                case rtc::LS_ERROR:
+                    mCallback->LogMessage(LLWebRTCLogCallback::LOG_LEVEL_VERBOSE, msg);
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+
+    void OnLogMessage(const std::string& message) override
+    {
+        if (mCallback)
+        {
+            mCallback->LogMessage(LLWebRTCLogCallback::LOG_LEVEL_VERBOSE, message);
+        }
+    }
+
+private:
+    LLWebRTCLogCallback* mCallback;
+};
 
 // Implements a class allowing capture of audio data
 // to determine audio level of the microphone.
@@ -139,8 +187,11 @@ class LLCustomProcessor : public webrtc::CustomProcessing
 class LLWebRTCImpl : public LLWebRTCDeviceInterface, public webrtc::AudioDeviceSink
 {
   public:
-    LLWebRTCImpl();
-    ~LLWebRTCImpl() {}
+    LLWebRTCImpl(LLWebRTCLogCallback* logCallback);
+    ~LLWebRTCImpl()
+    {
+        delete mLogSink;
+    }
 
     void init();
     void terminate();
@@ -228,6 +279,8 @@ class LLWebRTCImpl : public LLWebRTCDeviceInterface, public webrtc::AudioDeviceS
     void setRecording(bool recording);
 
   protected:
+    LLWebRTCLogSink*                                           mLogSink;
+
     // The native webrtc threads
     std::unique_ptr<rtc::Thread>                               mNetworkThread;
     std::unique_ptr<rtc::Thread>                               mWorkerThread;