Add rotating log file stream.

webrtc/base/logsinks.h

Index: webrtc/base/logsinks.h
diff --git a/webrtc/base/logsinks.h b/webrtc/base/logsinks.h
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+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_FILE_ROTATING_LOG_SINK_H_
+#define WEBRTC_BASE_FILE_ROTATING_LOG_SINK_H_
+
+#include <string>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/filerotatingstream.h"
+#include "webrtc/base/logging.h"
+#include "webrtc/base/scoped_ptr.h"
+
+namespace rtc {
+
+// Log sink that uses a FileRotatingStream to write to disk.
+// Init() must be called before adding this sink.
+class FileRotatingLogSink : public LogSink {
+ public:
+  // |num_log_files| must be greater than 1 and |max_log_size| must be greater
+  // than 0.
+  FileRotatingLogSink(const std::string& log_dir_path,
+                      const std::string& log_prefix,
+                      size_t max_log_size,
+                      size_t num_log_files);
+  ~FileRotatingLogSink() override;
+
+  // Writes the message to the current file. It will spill over to the next
+  // file if needed.
+  void OnLogMessage(const std::string& message) override;
+
+  // Deletes any existing files in the directory and creates a new log file.
+  virtual bool Init();
+
+ protected:
+  explicit FileRotatingLogSink(FileRotatingStream* stream);
+
+ private:
+  scoped_ptr<FileRotatingStream> stream_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileRotatingLogSink);
+};
+
+// Log sink that uses a CallSessionFileRotatingStream to write to disk.
+// Init() must be called before adding this sink.
+class CallSessionFileRotatingLogSink : public FileRotatingLogSink {
+ public:
+  CallSessionFileRotatingLogSink(const std::string& log_dir_path,
+                                 size_t max_total_log_size);
+  ~CallSessionFileRotatingLogSink() override;
+
+ private:
+  scoped_ptr<CallSessionFileRotatingStream> stream_;
+
+  DISALLOW_COPY_AND_ASSIGN(CallSessionFileRotatingLogSink);
+};
+
+}  // namespace rtc
+
+#endif  // WEBRTC_BASE_FILE_ROTATING_LOG_SINK_H_