Improved daemon error logging

src/daemon.cpp

@@ -5,13 +5,13 @@
 
 #include "daemon/beanstalk.hpp"
 #include "daemon/uuid.h"
+#include "daemon/logging_videobuffer.h"
 
 #include "tclap/CmdLine.h"
 #include "alpr.h"
 #include "openalpr/simpleini/simpleini.h"
 #include "openalpr/cjson.h"
 #include "support/tinythread.h"
-#include "videobuffer.h"
 #include <curl/curl.h>
 #include "support/timing.h"
 
@@ -230,7 +230,7 @@ void streamRecognitionThread(void* arg)
   
   int framenum = 0;
   
-  VideoBuffer videoBuffer;
+  LoggingVideoBuffer videoBuffer(logger);
   
   videoBuffer.connect(tdata->stream_url, 5);
   

src/daemon/logging_videobuffer.h

@@ -0,0 +1,50 @@
+#ifndef OPENALPR_LOGGING_VIDEOBUFFER_H
+#define OPENALPR_LOGGING_VIDEOBUFFER_H
+#include "../videobuffer.h"
+
+#include <log4cplus/logger.h>
+
+
+class LoggingVideoDispatcher : public VideoDispatcher
+{
+  public:
+    LoggingVideoDispatcher(std::string mjpeg_url, int fps, log4cplus::Logger logger) : 
+      VideoDispatcher(mjpeg_url, fps)
+      {
+	this->logger = logger;
+      }
+    
+  virtual void log_info(std::string message)
+  {
+    LOG4CPLUS_INFO(logger, message);
+  }
+  virtual void log_error(std::string error)
+  {
+    LOG4CPLUS_WARN(logger, error );
+  }
+    
+  private:
+    log4cplus::Logger logger;
+};
+
+
+class LoggingVideoBuffer : public VideoBuffer
+{
+  public:
+    LoggingVideoBuffer(log4cplus::Logger logger) : VideoBuffer()
+    {
+      this->logger = logger;
+    }
+  
+  protected:
+    
+    virtual VideoDispatcher* createDispatcher(std::string mjpeg_url, int fps)
+    {
+      return new LoggingVideoDispatcher(mjpeg_url, fps, logger);
+    }
+  
+  private:
+    log4cplus::Logger logger;
+};
+
+#endif // OPENALPR_LOGGING_VIDEOBUFFER_H

src/videobuffer.cpp

@@ -38,6 +38,10 @@ VideoBuffer::~VideoBuffer()
   }
 }
 
+VideoDispatcher* VideoBuffer::createDispatcher(std::string mjpeg_url, int fps)
+{
+  return new VideoDispatcher(mjpeg_url, fps);
+}
 
 void VideoBuffer::connect(std::string mjpeg_url, int fps)
 {
@@ -62,7 +66,7 @@ void VideoBuffer::connect(std::string mjpeg_url, int fps)
 
     }
     
-    dispatcher = new VideoDispatcher(mjpeg_url, fps);
+    dispatcher = createDispatcher(mjpeg_url, fps);
       
     tthread::thread* t = new tthread::thread(imageCollectionThread, (void*) dispatcher);
     
@@ -103,14 +107,33 @@ void imageCollectionThread(void* arg)
       cv::VideoCapture cap=cv::VideoCapture();
       cap.open(dispatcher->mjpeg_url);
       
-      getALPRImages(cap, dispatcher);
+      if (cap.isOpened())
+      {
+	getALPRImages(cap, dispatcher);
+      }
+      else
+      {
+	std::stringstream ss;
+	ss << "Stream " << dispatcher->mjpeg_url << " failed to open.";
+	dispatcher->log_error(ss.str());
+      }
 
     }
     catch (const std::runtime_error& error)
     {
       // Error occured while trying to gather image.  Retry, don't exit.
-      std::cerr << "VideoBuffer exception: " << error.what() << std::endl;
+      std::stringstream ss;
+      ss << "VideoBuffer exception: " << error.what();
+      dispatcher->log_error( ss.str() );
     }
+    catch (cv::Exception e)
+    {
+      // OpenCV Exception occured while trying to gather image.  Retry, don't exit.
+      std::stringstream ss;
+      ss << "VideoBuffer OpenCV exception: " << e.what();
+      dispatcher->log_error( ss.str() );
+    }
+    
     // Delay 1 second
     usleep(1000000);
     
@@ -137,9 +160,12 @@ void getALPRImages(cv::VideoCapture cap, VideoDispatcher* dispatcher)
       {
 	hasImage = cap.read(frame);
 	// Double check the image to make sure it's valid.
-	if (frame.cols == 0 || frame.rows == 0)
+	if (!frame.data || frame.empty())
 	{
 	  dispatcher->mMutex.unlock();
+	  std::stringstream ss;
+	  ss << "Stream " << dispatcher->mjpeg_url << " received invalid frame";
+	  dispatcher->log_error(ss.str());
 	  return;
 	}
 	
@@ -148,7 +174,9 @@ void getALPRImages(cv::VideoCapture cap, VideoDispatcher* dispatcher)
       catch (const std::runtime_error& error)
       {
 	// Error occured while trying to gather image.  Retry, don't exit.
-	std::cerr << "Exception happened " <<  error.what() << std::endl;
+	std::stringstream ss;
+	ss << "Exception happened " <<  error.what();
+	dispatcher->log_error(ss.str());
 	dispatcher->mMutex.unlock();
 	return;
       }

src/videobuffer.h

@@ -3,6 +3,7 @@
 
 #include <cstdio>
 #include <stdexcept>
+#include <sstream>
 
 #include "opencv2/highgui/highgui.hpp"
 
@@ -47,6 +48,15 @@ class VideoDispatcher
       this->latestFrameNumber++;
     }
     
+    virtual void log_info(std::string message)
+    {
+      std::cout << message << std::endl;
+    }
+    virtual void log_error(std::string error)
+    {
+      std::cerr << error << std::endl;
+    }
+    
     bool active;
     
     int latestFrameNumber;
@@ -69,6 +79,7 @@ class VideoBuffer
     virtual ~VideoBuffer();
 
     void connect(std::string mjpeg_url, int fps);
+    
 
     // If a new frame is available, the function sets "frame" to it and returns the frame number
     // If no frames are available, or the latest has already been grabbed, returns -1.
@@ -76,6 +87,10 @@ class VideoBuffer
 
     void disconnect();
     
+  protected:
+  
+    virtual VideoDispatcher* createDispatcher(std::string mjpeg_url, int fps);
+    
   private: