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113 lines
3.2 KiB
C++
113 lines
3.2 KiB
C++
// Copyright 2014 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/test/trace_to_file.h"
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#include "base/base_switches.h"
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#include "base/command_line.h"
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#include "base/files/file_util.h"
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#include "base/functional/bind.h"
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#include "base/memory/ref_counted_memory.h"
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#include "base/run_loop.h"
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#include "base/task/single_thread_task_runner.h"
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#include "base/test/task_environment.h"
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#include "base/trace_event/trace_buffer.h"
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#include "base/trace_event/trace_log.h"
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namespace base {
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namespace test {
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TraceToFile::TraceToFile() : started_(false) {
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}
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TraceToFile::~TraceToFile() {
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EndTracingIfNeeded();
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}
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void TraceToFile::BeginTracingFromCommandLineOptions() {
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DCHECK(CommandLine::InitializedForCurrentProcess());
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DCHECK(!started_);
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if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kTraceToFile))
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return;
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// Empty filter (i.e. just --trace-to-file) turns into default categories in
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// TraceEventImpl
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std::string filter = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
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switches::kTraceToFile);
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FilePath path;
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if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kTraceToFileName)) {
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path = FilePath(CommandLine::ForCurrentProcess()
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->GetSwitchValuePath(switches::kTraceToFileName));
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} else {
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path = FilePath(FILE_PATH_LITERAL("trace.json"));
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}
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BeginTracing(path, filter);
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}
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void TraceToFile::BeginTracing(const FilePath& path,
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const std::string& categories) {
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DCHECK(!started_);
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started_ = true;
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path_ = path;
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WriteFileHeader();
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trace_event::TraceLog::GetInstance()->SetEnabled(
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trace_event::TraceConfig(categories, trace_event::RECORD_UNTIL_FULL),
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trace_event::TraceLog::RECORDING_MODE);
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}
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void TraceToFile::WriteFileHeader() {
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WriteFile(path_, "{\"traceEvents\": [");
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}
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void TraceToFile::AppendFileFooter() {
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const char str[] = "]}";
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AppendToFile(path_, str);
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}
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void TraceToFile::TraceOutputCallback(const std::string& data) {
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bool ret = AppendToFile(path_, data);
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DCHECK(ret);
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}
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static void OnTraceDataCollected(
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OnceClosure quit_closure,
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trace_event::TraceResultBuffer* buffer,
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const scoped_refptr<RefCountedString>& json_events_str,
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bool has_more_events) {
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buffer->AddFragment(json_events_str->as_string());
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if (!has_more_events)
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std::move(quit_closure).Run();
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}
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void TraceToFile::EndTracingIfNeeded() {
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if (!started_)
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return;
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started_ = false;
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trace_event::TraceLog::GetInstance()->SetDisabled();
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trace_event::TraceResultBuffer buffer;
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buffer.SetOutputCallback(
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BindRepeating(&TraceToFile::TraceOutputCallback, Unretained(this)));
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// In tests we might not have a TaskEnvironment, create one if needed.
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std::unique_ptr<SingleThreadTaskEnvironment> task_environment;
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if (!SingleThreadTaskRunner::HasCurrentDefault())
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task_environment = std::make_unique<SingleThreadTaskEnvironment>();
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RunLoop run_loop;
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trace_event::TraceLog::GetInstance()->Flush(BindRepeating(
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&OnTraceDataCollected, run_loop.QuitClosure(), Unretained(&buffer)));
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run_loop.Run();
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AppendFileFooter();
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}
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} // namespace test
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} // namespace base
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