net/base/net_log_logger.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_BASE_NET_LOG_LOGGER_H_
   6 #define NET_BASE_NET_LOG_LOGGER_H_
   7
   8 #include <stdio.h>
   9
  10 #include "base/memory/scoped_handle.h"
  11 #include "net/base/net_log.h"
  12
  13 namespace base {
  14 class FilePath;
  15 class Value;
  16 }
  17
  18 namespace net {
  19
  20 // NetLogLogger watches the NetLog event stream, and sends all entries to
  21 // a file specified on creation.
  22 //
  23 // The text file will contain a single JSON object.
  24 class NET_EXPORT NetLogLogger : public NetLog::ThreadSafeObserver {
  25  public:
  26   // Takes ownership of |file| and will write network events to it once logging
  27   // starts.  |file| must be non-NULL handle and be open for writing.
  28   // |constants| is a legend for decoding constant values used in the log.
  29   NetLogLogger(FILE* file, const base::Value& constants);
  30   virtual ~NetLogLogger();
  31
  32   // Starts observing specified NetLog.  Must not already be watching a NetLog.
  33   // Separate from constructor to enforce thread safety.
  34   void StartObserving(NetLog* net_log);
  35
  36   // Stops observing net_log().  Must already be watching.
  37   void StopObserving();
  38
  39   // net::NetLog::ThreadSafeObserver implementation:
  40   virtual void OnAddEntry(const NetLog::Entry& entry) OVERRIDE;
  41
  42   // Create a dictionary containing legend for net/ constants.  Caller takes
  43   // ownership of returned value.
  44   static base::DictionaryValue* GetConstants();
  45
  46  private:
  47   ScopedStdioHandle file_;
  48
  49   // True if OnAddEntry() has been called at least once.
  50   bool added_events_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(NetLogLogger);
  53 };
  54
  55 }  // namespace net
  56
  57 #endif  // NET_BASE_NET_LOG_LOGGER_H_