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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/feedback/content/content_tracing_manager.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/memory/ptr_util.h"
#include "base/memory/ref_counted_memory.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/thread_pool.h"
#include "base/trace_event/trace_config.h"
#include "components/feedback/feedback_util.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/tracing_controller.h"
namespace {
// Only once trace manager can exist at a time.
ContentTracingManager* g_tracing_manager = nullptr;
// 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");
scoped_refptr<base::RefCountedString> CompressTraceData(
std::unique_ptr<std::string> trace_data) {
std::optional<std::string> output_val =
feedback_util::ZipString(base::FilePath(kTracingFilename), *trace_data);
return base::MakeRefCounted<base::RefCountedString>(
output_val.value_or(std::string()));
}
} // namespace
ContentTracingManager::ContentTracingManager() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(!g_tracing_manager);
g_tracing_manager = this;
StartTracing();
}
ContentTracingManager::~ContentTracingManager() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(g_tracing_manager == this);
g_tracing_manager = nullptr;
}
int ContentTracingManager::RequestTrace() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// 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()->StopTracing(
content::TracingController::CreateStringEndpoint(
base::BindOnce(&ContentTracingManager::OnTraceDataCollected,
weak_ptr_factory_.GetWeakPtr())));
return current_trace_id_;
}
bool ContentTracingManager::GetTraceData(int id, TraceDataCallback callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// 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_) {
trace_callback_ = std::move(callback);
return true;
} else {
return false;
}
} else {
auto data = trace_data_.find(id);
if (data == trace_data_.end())
return false;
// Always return the data asynchronously, so the behavior is consistent.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), data->second));
return true;
}
}
void ContentTracingManager::DiscardTraceData(int id) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
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_)
std::move(trace_callback_).Run(scoped_refptr<base::RefCountedString>());
}
}
base::WeakPtr<TracingManager> ContentTracingManager::AsWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
void ContentTracingManager::StartTracing() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
content::TracingController::GetInstance()->StartTracing(
base::trace_event::TraceConfig(),
content::TracingController::StartTracingDoneCallback());
}
void ContentTracingManager::OnTraceDataCollected(
std::unique_ptr<std::string> trace_data) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
if (!current_trace_id_)
return;
// Compress the trace data in a separate thread because the operation involves
// blocking calls.
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
base::BindOnce(&CompressTraceData, std::move(trace_data)),
base::BindOnce(&ContentTracingManager::OnTraceDataCompressed,
weak_ptr_factory_.GetWeakPtr()));
}
void ContentTracingManager::OnTraceDataCompressed(
scoped_refptr<base::RefCountedString> compressed_data) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
trace_data_[current_trace_id_] = compressed_data;
if (trace_callback_)
std::move(trace_callback_).Run(compressed_data);
current_trace_id_ = 0;
// Tracing has to be restarted asynchronous, so the ContentTracingManager can
// clean up.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(&ContentTracingManager::StartTracing,
weak_ptr_factory_.GetWeakPtr()));
}
// static
std::unique_ptr<ContentTracingManager> ContentTracingManager::Create() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
if (g_tracing_manager)
return nullptr;
return base::WrapUnique(new ContentTracingManager);
}
ContentTracingManager* ContentTracingManager::Get() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
return g_tracing_manager;
}
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