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// 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.
#include "chrome/browser/feedback/tracing_manager.h"
#include "base/bind.h"
#include "base/file_util.h"
#include "base/location.h"
#include "base/memory/ref_counted_memory.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/prefs/pref_service.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/feedback/feedback_util.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/tracing_controller.h"
namespace {
// Only once trace manager can exist at a time.
TracingManager* g_tracing_manager = NULL;
// Trace IDs start at 1 and increase.
int g_next_trace_id = 1;
// Name of the file to store the tracing data as.
const base::FilePath::CharType kTracingFilename[] =
FILE_PATH_LITERAL("tracing.json");
}
TracingManager::TracingManager()
: current_trace_id_(0),
weak_ptr_factory_(this) {
DCHECK(!g_tracing_manager);
g_tracing_manager = this;
StartTracing();
}
TracingManager::~TracingManager() {
DCHECK(g_tracing_manager == this);
g_tracing_manager = NULL;
}
int TracingManager::RequestTrace() {
// Return the current trace if one is being collected.
if (current_trace_id_)
return current_trace_id_;
current_trace_id_ = g_next_trace_id;
++g_next_trace_id;
content::TracingController::GetInstance()->DisableRecording(
base::FilePath(),
base::Bind(&TracingManager::OnTraceDataCollected,
weak_ptr_factory_.GetWeakPtr()));
return current_trace_id_;
}
bool TracingManager::GetTraceData(int id, const TraceDataCallback& callback) {
// If a trace is being collected currently, send it via callback when
// complete.
if (current_trace_id_) {
// Only allow one trace data request at a time.
if (trace_callback_.is_null()) {
trace_callback_ = callback;
return true;
} else {
return false;
}
} else {
std::map<int, scoped_refptr<base::RefCountedString> >::iterator data =
trace_data_.find(id);
if (data == trace_data_.end())
return false;
// Always return the data asychronously, so the behavior is consistant.
base::MessageLoopProxy::current()->PostTask(
FROM_HERE,
base::Bind(callback, data->second));
return true;
}
}
void TracingManager::DiscardTraceData(int id) {
trace_data_.erase(id);
// If the trace is discarded before it is complete, clean up the accumulators.
if (id == current_trace_id_) {
current_trace_id_ = 0;
// If the trace has already been requested, provide an empty string.
if (!trace_callback_.is_null()) {
trace_callback_.Run(scoped_refptr<base::RefCountedString>());
trace_callback_.Reset();
}
}
}
void TracingManager::StartTracing() {
content::TracingController::GetInstance()->EnableRecording(
"", content::TracingController::DEFAULT_OPTIONS,
content::TracingController::EnableRecordingDoneCallback());
}
void TracingManager::OnTraceDataCollected(const base::FilePath& path) {
if (!current_trace_id_)
return;
std::string data;
if (!base::ReadFileToString(path, &data)) {
LOG(ERROR) << "Failed to read trace data from: " << path.value();
return;
}
base::DeleteFile(path, false);
std::string output_val;
feedback_util::ZipString(
base::FilePath(kTracingFilename), data, &output_val);
scoped_refptr<base::RefCountedString> output(
base::RefCountedString::TakeString(&output_val));
trace_data_[current_trace_id_] = output;
if (!trace_callback_.is_null()) {
trace_callback_.Run(output);
trace_callback_.Reset();
}
current_trace_id_ = 0;
// Tracing has to be restarted asynchronous, so the TracingController can
// clean up.
base::MessageLoopProxy::current()->PostTask(
FROM_HERE,
base::Bind(&TracingManager::StartTracing,
weak_ptr_factory_.GetWeakPtr()));
}
// static
scoped_ptr<TracingManager> TracingManager::Create() {
if (g_tracing_manager)
return scoped_ptr<TracingManager>();
return scoped_ptr<TracingManager>(new TracingManager());
}
TracingManager* TracingManager::Get() {
return g_tracing_manager;
}
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