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// Copyright 2014 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 COMPONENTS_RAPPOR_LOG_UPLOADER_H_
#define COMPONENTS_RAPPOR_LOG_UPLOADER_H_
#include <queue>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "components/rappor/log_uploader_interface.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_request_context_getter.h"
#include "url/gurl.h"
namespace net {
class URLFetcher;
}
namespace rappor {
// Uploads logs from RapporService. Logs are passed in via QueueLog(), stored
// internally, and uploaded one at a time. A queued log will be uploaded at a
// fixed interval after the successful upload of the previous logs. If an
// upload fails, the uploader will keep retrying the upload with an exponential
// backoff interval.
class LogUploader : public net::URLFetcherDelegate,
public LogUploaderInterface {
public:
// Constructor takes the |server_url| that logs should be uploaded to, the
// |mime_type| of the uploaded data, and |request_context| to create uploads
// with.
LogUploader(const GURL& server_url,
const std::string& mime_type,
net::URLRequestContextGetter* request_context);
// If the object is destroyed (or the program terminates) while logs are
// queued, the logs are lost.
~LogUploader() override;
// LogUploaderInterface:
void Start() override;
void Stop() override;
void QueueLog(const std::string& log) override;
protected:
// Checks if an upload has been scheduled.
virtual bool IsUploadScheduled() const;
// Schedules a future call to StartScheduledUpload if one isn't already
// pending. Can be overridden for testing.
virtual void ScheduleNextUpload(base::TimeDelta interval);
// Starts transmission of the next log. Exposed for tests.
void StartScheduledUpload();
// Increases the upload interval each time it's called, to handle the case
// where the server is having issues. Exposed for tests.
static base::TimeDelta BackOffUploadInterval(base::TimeDelta);
private:
// Returns true if the uploader is allowed to start another upload.
bool CanStartUpload() const;
// Drops excess logs until we are under the size limit.
void DropExcessLogs();
// Implements net::URLFetcherDelegate. Called after transmission completes
// (whether successful or not).
void OnURLFetchComplete(const net::URLFetcher* source) override;
// Called when the upload is completed.
void OnUploadFinished(bool server_is_healthy);
// The server URL to upload logs to.
const GURL server_url_;
// The mime type to specify on uploaded logs.
const std::string mime_type_;
// The request context used to send uploads.
scoped_refptr<net::URLRequestContextGetter> request_context_;
// True if the uploader is currently running.
bool is_running_;
// The outstanding transmission that appears as a URL Fetch operation.
scoped_ptr<net::URLFetcher> current_fetch_;
// The logs that still need to be uploaded.
std::queue<std::string> queued_logs_;
// A timer used to delay before attempting another upload.
base::OneShotTimer<LogUploader> upload_timer_;
// Indicates that the last triggered upload hasn't resolved yet.
bool has_callback_pending_;
// The interval to wait after an upload's URLFetcher completion before
// starting the next upload attempt.
base::TimeDelta upload_interval_;
DISALLOW_COPY_AND_ASSIGN(LogUploader);
};
} // namespace rappor
#endif // COMPONENTS_RAPPOR_LOG_UPLOADER_H_
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