Implementing uploading of a WebRTC diagnostic log.

chrome/browser/media/webrtc_log_uploader.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_MEDIA_WEBRTC_LOG_UPLOADER_H_
+#define CHROME_BROWSER_MEDIA_WEBRTC_LOG_UPLOADER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/platform_file.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace base {
+class SharedMemory;
+}
+
+namespace net {
+class URLFetcher;
+class URLRequestContextGetter;
+}
+
+typedef struct z_stream_s z_stream;
+
+class WebRtcLogURLRequestContextGetter;
+
+// WebRtcLogUploader uploads WebRTC logs, keeps count of how many logs have
+// been started and denies further logs if a limit is reached. There must only
+// be one object of this type.
+class WebRtcLogUploader : public net::URLFetcherDelegate {
+ public:
+  WebRtcLogUploader();
+  virtual ~WebRtcLogUploader();
+
+  // net::URLFetcherDelegate implementation.
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+  virtual void OnURLFetchUploadProgress(const net::URLFetcher* source,
+                                        int64 current, int64 total) OVERRIDE;
+
+  // Returns true is number of logs limit is not reached yet. Increases log
+  // count if true is returned. Must be called before UploadLog().
+  bool ApplyForStartLogging();
+
+  // Uploads log and decreases log count. May only be called if permission to
+  // to log has been granted by calling ApplyForStartLogging() and getting true
+  // in return. After UploadLog has been called, a new permission must be
+  // granted.
+  void UploadLog(net::URLRequestContextGetter* request_context,
+                 scoped_ptr<base::SharedMemory> shared_memory,
+                 uint32 length,
+                 const std::string& app_session_id,
+                 const std::string& app_url);
+
+ private:
+  // Sets up a multipart body to be uploaded. The body is produced according
+  // to RFC 2046.
+  void SetupMultipart(std::string* post_data, uint8* log_buffer,
+                      uint32 log_buffer_length,
+                      const std::string& app_session_id,
+                      const std::string& app_url);
+
+  void AddLogData(std::string* post_data, uint8* log_buffer,
+                  uint32 log_buffer_length);
+  void CompressLog(std::string* post_data, uint8* input, uint32 input_size);
+  void ResizeForNextOutput(std::string* post_data, z_stream* stream);
+  void DecreaseLogCount();
+
+  int log_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRtcLogUploader);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_WEBRTC_LOG_UPLOADER_H_