// 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 CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
#define CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
#include <set>
#include <string>
#include "base/callback.h"
#include "content/common/content_export.h"
namespace base {
class FilePath;
};
namespace content {
class TracingController;
// TracingController is used on the browser processes to enable/disable
// trace status and collect trace data. Only the browser UI thread is allowed
// to interact with the TracingController object. All callbacks are called on
// the UI thread.
class TracingController {
public:
enum Options {
DEFAULT_OPTIONS = 0,
ENABLE_SYSTRACE = 1 << 0,
ENABLE_SAMPLING = 1 << 1,
RECORD_CONTINUOUSLY = 1 << 2, // For EnableRecording() only.
};
CONTENT_EXPORT static TracingController* GetInstance();
// Get a set of category groups. The category groups can change as
// new code paths are reached.
//
// Once all child processes have acked to the GetCategories request,
// GetCategoriesDoneCallback is called back with a set of category
// groups.
typedef base::Callback<void(const std::set<std::string>&)>
GetCategoriesDoneCallback;
virtual bool GetCategories(
const GetCategoriesDoneCallback& callback) = 0;
// Start recording on all processes.
//
// Recording begins immediately locally, and asynchronously on child processes
// as soon as they receive the EnableRecording request.
//
// Once all child processes have acked to the EnableRecording request,
// EnableRecordingDoneCallback will be called back.
//
// |category_filter| is a filter to control what category groups should be
// traced. A filter can have an optional '-' prefix to exclude category groups
// that contain a matching category. Having both included and excluded
// category patterns in the same list would not be supported.
//
// Examples: "test_MyTest*",
// "test_MyTest*,test_OtherStuff",
// "-excluded_category1,-excluded_category2"
//
// |options| controls what kind of tracing is enabled.
typedef base::Callback<void()> EnableRecordingDoneCallback;
virtual bool EnableRecording(
const std::string& category_filter,
TracingController::Options options,
const EnableRecordingDoneCallback& callback) = 0;
// Stop recording on all processes.
//
// Child processes typically are caching trace data and only rarely flush
// and send trace data back to the browser process. That is because it may be
// an expensive operation to send the trace data over IPC, and we would like
// to avoid much runtime overhead of tracing. So, to end tracing, we must
// asynchronously ask all child processes to flush any pending trace data.
//
// Once all child processes have acked to the DisableRecording request,
// TracingFileResultCallback will be called back with a file that contains
// the traced data.
//
// Trace data will be written into |result_file_path| if it is not empty, or
// into a temporary file. The actual file path will be passed to |callback| if
// it's not null.
//
// If |result_file_path| is empty and |callback| is null, trace data won't be
// written to any file.
typedef base::Callback<void(const base::FilePath&)> TracingFileResultCallback;
virtual bool DisableRecording(const base::FilePath& result_file_path,
const TracingFileResultCallback& callback) = 0;
// Start monitoring on all processes.
//
// Monitoring begins immediately locally, and asynchronously on child
// processes as soon as they receive the EnableMonitoring request.
//
// Once all child processes have acked to the EnableMonitoring request,
// EnableMonitoringDoneCallback will be called back.
//
// |category_filter| is a filter to control what category groups should be
// traced.
//
// |options| controls what kind of tracing is enabled.
typedef base::Callback<void()> EnableMonitoringDoneCallback;
virtual bool EnableMonitoring(
const std::string& category_filter,
TracingController::Options options,
const EnableMonitoringDoneCallback& callback) = 0;
// Stop monitoring on all processes.
//
// Once all child processes have acked to the DisableMonitoring request,
// DisableMonitoringDoneCallback is called back.
typedef base::Callback<void()> DisableMonitoringDoneCallback;
virtual bool DisableMonitoring(
const DisableMonitoringDoneCallback& callback) = 0;
// Get the current monitoring configuration.
virtual void GetMonitoringStatus(bool* out_enabled,
std::string* out_category_filter,
TracingController::Options* out_options) = 0;
// Get the current monitoring traced data.
//
// Child processes typically are caching trace data and only rarely flush
// and send trace data back to the browser process. That is because it may be
// an expensive operation to send the trace data over IPC, and we would like
// to avoid much runtime overhead of tracing. So, to end tracing, we must
// asynchronously ask all child processes to flush any pending trace data.
//
// Once all child processes have acked to the CaptureMonitoringSnapshot
// request, TracingFileResultCallback will be called back with a file that
// contains the traced data.
//
// Trace data will be written into |result_file_path| if it is not empty, or
// into a temporary file. The actual file path will be passed to |callback|.
//
// If |result_file_path| is empty and |callback| is null, trace data won't be
// written to any file.
virtual bool CaptureMonitoringSnapshot(
const base::FilePath& result_file_path,
const TracingFileResultCallback& callback) = 0;
// Get the maximum across processes of trace buffer percent full state.
// When the TraceBufferPercentFull value is determined, the callback is
// called.
typedef base::Callback<void(float)> GetTraceBufferPercentFullCallback;
virtual bool GetTraceBufferPercentFull(
const GetTraceBufferPercentFullCallback& callback) = 0;
// |callback| will will be called every time the given event occurs on any
// process.
typedef base::Callback<void()> WatchEventCallback;
virtual bool SetWatchEvent(const std::string& category_name,
const std::string& event_name,
const WatchEventCallback& callback) = 0;
// Cancel the watch event. If tracing is enabled, this may race with the
// watch event callback.
virtual bool CancelWatchEvent() = 0;
protected:
virtual ~TracingController() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_