add logging api (#117)

* add logging api

* Update rtc_logging.cc

---------

Co-authored-by: Igor Ponomarenko <[email protected]>
Co-authored-by: CloudWebRTC <[email protected]>

Author: 3 people

BUILD.gn

@@ -94,6 +94,7 @@ rtc_shared_library("libwebrtc") {
     "include/rtc_video_renderer.h",
     "include/rtc_video_source.h",
     "include/rtc_video_track.h",
+    "include/rtc_logging.h",
     "include/helper.h",
     "src/helper.cc",
     "src/base/portable.cc",
@@ -160,6 +161,7 @@ rtc_shared_library("libwebrtc") {
     "src/rtc_video_source_impl.h",
     "src/rtc_video_track_impl.cc",
     "src/rtc_video_track_impl.h",
+    "src/rtc_logging.cc",
   ]
 
   # intel media sdk

include/rtc_logging.h

@@ -0,0 +1,25 @@
+#ifndef LIB_WEBRTC_RTC_LOGGING_HXX
+#define LIB_WEBRTC_RTC_LOGGING_HXX
+
+#include "rtc_types.h"
+
+namespace libwebrtc {
+
+  enum RTCLoggingSeverity {
+    Verbose,
+    Info,
+    Warning,
+    Error,
+    None,
+  };
+
+  typedef void (*RTCCallbackLoggerMessageHandler)(const string& message);
+
+  class LibWebRTCLogging {
+    public:
+      LIB_WEBRTC_API static void setMinDebugLogLevel(RTCLoggingSeverity severity);
+      LIB_WEBRTC_API static void setLogSink(RTCLoggingSeverity severity, RTCCallbackLoggerMessageHandler callbackHandler);
+  };
+}  // namespace libwebrtc
+
+#endif  // LIB_WEBRTC_RTC_LOGGING_HXX

src/rtc_logging.cc

@@ -0,0 +1,48 @@
+#include "rtc_logging.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/log_sinks.h"
+
+#include <memory>
+using std::unique_ptr;
+
+namespace libwebrtc {
+
+  inline rtc::LoggingSeverity getNativeLoggingSeverity(RTCLoggingSeverity severity) {
+    switch (severity) {
+      case Verbose:
+        return rtc::LS_VERBOSE;
+      case Info:
+        return rtc::LS_INFO;
+      case Warning:
+        return rtc::LS_WARNING;
+      case Error:
+        return rtc::LS_ERROR;
+      case None:
+        return rtc::LS_NONE;
+    }
+  }
+
+  class CallbackLogSink final : public rtc::LogSink {
+    public:
+      CallbackLogSink(RTCCallbackLoggerMessageHandler _callbackHandler)
+          : callback_handler(_callbackHandler) {}
+
+      void OnLogMessage(const std::string& message) override {
+          callback_handler(string(message));
+      }
+
+    private:
+      RTCCallbackLoggerMessageHandler callback_handler;
+  };
+
+  static std::unique_ptr<CallbackLogSink> log_sink;
+
+  void LibWebRTCLogging::setMinDebugLogLevel(RTCLoggingSeverity severity) {
+    rtc::LogMessage::LogToDebug(getNativeLoggingSeverity(severity));
+  }
+
+  void LibWebRTCLogging::setLogSink(RTCLoggingSeverity severity, RTCCallbackLoggerMessageHandler callbackHandler) {
+    log_sink.reset(new CallbackLogSink(callbackHandler));
+    rtc::LogMessage::AddLogToStream(log_sink.get(), getNativeLoggingSeverity(severity));
+  }
+}  // namespace libwebrtc