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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 "content/browser/trace_subscriber_stdio.h"
#include "base/bind.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/threading/sequenced_worker_pool.h"
#include "content/public/browser/browser_thread.h"
namespace content {
// All method calls on this class are done on a SequencedWorkerPool thread.
class TraceSubscriberStdioImpl
: public base::RefCountedThreadSafe<TraceSubscriberStdioImpl> {
public:
explicit TraceSubscriberStdioImpl(const FilePath& path)
: path_(path),
file_(0) {}
void OnStart() {
DCHECK(!file_);
file_ = file_util::OpenFile(path_, "w+");
if (IsValid()) {
LOG(INFO) << "Logging performance trace to file: " << path_.value();
trace_buffer_.SetOutputCallback(
base::Bind(&TraceSubscriberStdioImpl::Write, this));
trace_buffer_.Start();
} else {
LOG(ERROR) << "Failed to open performance trace file: " << path_.value();
}
}
void OnData(const scoped_refptr<base::RefCountedString>& data_ptr) {
trace_buffer_.AddFragment(data_ptr->data());
}
void OnEnd() {
trace_buffer_.Finish();
CloseFile();
}
private:
friend class base::RefCountedThreadSafe<TraceSubscriberStdioImpl>;
~TraceSubscriberStdioImpl() {
CloseFile();
}
bool IsValid() {
return file_ && (0 == ferror(file_));
}
void CloseFile() {
if (file_) {
fclose(file_);
file_ = 0;
}
// This is important, as it breaks a reference cycle.
trace_buffer_.SetOutputCallback(
base::debug::TraceResultBuffer::OutputCallback());
}
void Write(const std::string& output_str) {
if (IsValid()) {
size_t written = fwrite(output_str.data(), 1, output_str.size(), file_);
if (written != output_str.size()) {
LOG(ERROR) << "Error " << ferror(file_) << " in fwrite() to trace file";
CloseFile();
}
}
}
FilePath path_;
FILE* file_;
base::debug::TraceResultBuffer trace_buffer_;
};
TraceSubscriberStdio::TraceSubscriberStdio(const FilePath& path)
: impl_(new TraceSubscriberStdioImpl(path)) {
BrowserThread::PostBlockingPoolSequencedTask(
__FILE__, FROM_HERE,
base::Bind(&TraceSubscriberStdioImpl::OnStart, impl_));
}
TraceSubscriberStdio::~TraceSubscriberStdio() {
}
void TraceSubscriberStdio::OnEndTracingComplete() {
BrowserThread::PostBlockingPoolSequencedTask(
__FILE__, FROM_HERE,
base::Bind(&TraceSubscriberStdioImpl::OnEnd, impl_));
}
void TraceSubscriberStdio::OnTraceDataCollected(
const scoped_refptr<base::RefCountedString>& data_ptr) {
BrowserThread::PostBlockingPoolSequencedTask(
__FILE__, FROM_HERE,
base::Bind(&TraceSubscriberStdioImpl::OnData, impl_, data_ptr));
}
} // namespace content
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