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// Copyright (c) 2011 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_EXTENSIONS_EXTENSION_WEBREQUEST_TIME_TRACKER_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBREQUEST_TIME_TRACKER_H_
#pragma once
#include <map>
#include <queue>
#include <set>
#include <string>
#include "base/time.h"
#include "base/gtest_prod_util.h"
#include "googleurl/src/gurl.h"
namespace base {
class Time;
}
// This class keeps monitors how much delay extensions add to network requests
// by using the webRequest API. If the delay is sufficient, we will warn the
// user that extensions are slowing down the browser.
class ExtensionWebRequestTimeTracker {
public:
ExtensionWebRequestTimeTracker();
~ExtensionWebRequestTimeTracker();
// Records the time that a request was created.
void LogRequestStartTime(int64 request_id, const base::Time& start_time,
const GURL& url);
// Records the time that a request either completed or encountered an error.
void LogRequestEndTime(int64 request_id, const base::Time& end_time);
// Records an additional delay for the given request caused by the given
// extension.
void IncrementExtensionBlockTime(
const std::string& extension_id,
int64 request_id,
const base::TimeDelta& block_time);
// Records an additional delay for the given request caused by all extensions
// combined.
void IncrementTotalBlockTime(
int64 request_id,
const base::TimeDelta& block_time);
// Called when an extension has canceled the given request.
void SetRequestCanceled(int64 request_id);
// Called when an extension has redirected the given request to another URL.
void SetRequestRedirected(int64 request_id);
private:
// Timing information for a single request.
struct RequestTimeLog {
GURL url; // used for debug purposes only
bool completed;
base::Time request_start_time;
base::TimeDelta request_duration;
base::TimeDelta block_duration;
std::map<std::string, base::TimeDelta> extension_block_durations;
RequestTimeLog();
~RequestTimeLog();
};
// Called after a request finishes, to analyze the delays and warn the user
// if necessary.
void Analyze(int64 request_id);
// A map of recent request IDs to timing info for each request.
std::map<int64, RequestTimeLog> request_time_logs_;
// A list of recent request IDs that we know about. Used to limit the size of
// the logs.
std::queue<int64> request_ids_;
// The set of recent requests that have been delayed either a large or
// moderate amount by extensions.
std::set<int64> excessive_delays_;
std::set<int64> moderate_delays_;
FRIEND_TEST_ALL_PREFIXES(ExtensionWebRequestTimeTrackerTest, Basic);
FRIEND_TEST_ALL_PREFIXES(ExtensionWebRequestTimeTrackerTest,
IgnoreFastRequests);
FRIEND_TEST_ALL_PREFIXES(ExtensionWebRequestTimeTrackerTest,
CancelOrRedirect);
FRIEND_TEST_ALL_PREFIXES(ExtensionWebRequestTimeTrackerTest, Delays);
DISALLOW_COPY_AND_ASSIGN(ExtensionWebRequestTimeTracker);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBREQUEST_TIME_TRACKER_H_
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