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// Copyright (c) 2012 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.
#include "chrome/test/base/tracing.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_util.h"
#include "base/timer/timer.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/tracing_controller.h"
#include "content/public/test/test_utils.h"
namespace {
using content::BrowserThread;
class InProcessTraceController {
public:
static InProcessTraceController* GetInstance() {
return Singleton<InProcessTraceController>::get();
}
InProcessTraceController()
: is_waiting_on_watch_(false),
watch_notification_count_(0) {}
virtual ~InProcessTraceController() {}
bool BeginTracing(const std::string& category_patterns) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
return content::TracingController::GetInstance()->EnableRecording(
category_patterns, content::TracingController::DEFAULT_OPTIONS,
content::TracingController::EnableRecordingDoneCallback());
return true;
}
bool BeginTracingWithWatch(const std::string& category_patterns,
const std::string& category_name,
const std::string& event_name,
int num_occurrences) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(num_occurrences > 0);
watch_notification_count_ = num_occurrences;
return content::TracingController::GetInstance()->SetWatchEvent(
category_name, event_name,
base::Bind(&InProcessTraceController::OnWatchEventMatched,
base::Unretained(this))) &&
BeginTracing(category_patterns);
}
bool WaitForWatchEvent(base::TimeDelta timeout) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (watch_notification_count_ == 0)
return true;
if (timeout != base::TimeDelta()) {
timer_.Start(FROM_HERE, timeout, this,
&InProcessTraceController::Timeout);
}
is_waiting_on_watch_ = true;
message_loop_runner_ = new content::MessageLoopRunner;
message_loop_runner_->Run();
is_waiting_on_watch_ = false;
return watch_notification_count_ == 0;
}
bool EndTracing(std::string* json_trace_output) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
using namespace base::debug;
if (!content::TracingController::GetInstance()->DisableRecording(
base::FilePath(),
base::Bind(&InProcessTraceController::OnTraceDataCollected,
base::Unretained(this),
base::Unretained(json_trace_output))))
return false;
// Wait for OnEndTracingComplete() to quit the message loop.
message_loop_runner_ = new content::MessageLoopRunner;
message_loop_runner_->Run();
// Watch notifications can occur during this method's message loop run, but
// not after, so clear them here.
watch_notification_count_ = 0;
return true;
}
private:
friend struct DefaultSingletonTraits<InProcessTraceController>;
void OnEndTracingComplete() {
message_loop_runner_->Quit();
}
void OnTraceDataCollected(std::string* json_trace_output,
const base::FilePath& path) {
BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&InProcessTraceController::ReadTraceData,
base::Unretained(this),
base::Unretained(json_trace_output),
path));
}
void ReadTraceData(std::string* json_trace_output,
const base::FilePath& path) {
json_trace_output->clear();
bool ok = base::ReadFileToString(path, json_trace_output);
DCHECK(ok);
base::DeleteFile(path, false);
// The callers expect an array of trace events.
const char* preamble = "{\"traceEvents\": ";
const char* trailout = "}";
DCHECK(StartsWithASCII(*json_trace_output, preamble, true));
DCHECK(EndsWith(*json_trace_output, trailout, true));
json_trace_output->erase(0, strlen(preamble));
json_trace_output->erase(json_trace_output->end() - 1);
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&InProcessTraceController::OnEndTracingComplete,
base::Unretained(this)));
}
void OnWatchEventMatched() {
if (watch_notification_count_ == 0)
return;
if (--watch_notification_count_ == 0) {
timer_.Stop();
if (is_waiting_on_watch_)
message_loop_runner_->Quit();
}
}
void Timeout() {
DCHECK(is_waiting_on_watch_);
message_loop_runner_->Quit();
}
scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
base::OneShotTimer<InProcessTraceController> timer_;
bool is_waiting_on_watch_;
int watch_notification_count_;
DISALLOW_COPY_AND_ASSIGN(InProcessTraceController);
};
} // namespace
namespace tracing {
bool BeginTracing(const std::string& category_patterns) {
return InProcessTraceController::GetInstance()->BeginTracing(
category_patterns);
}
bool BeginTracingWithWatch(const std::string& category_patterns,
const std::string& category_name,
const std::string& event_name,
int num_occurrences) {
return InProcessTraceController::GetInstance()->BeginTracingWithWatch(
category_patterns, category_name, event_name, num_occurrences);
}
bool WaitForWatchEvent(base::TimeDelta timeout) {
return InProcessTraceController::GetInstance()->WaitForWatchEvent(timeout);
}
bool EndTracing(std::string* json_trace_output) {
return InProcessTraceController::GetInstance()->EndTracing(json_trace_output);
}
} // namespace tracing
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