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// Copyright (c) 2015 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 "components/tracing/startup_tracing.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "base/trace_event/trace_event.h"
namespace tracing {
namespace {
// Maximum trace config file size that will be loaded, in bytes.
const size_t kTraceConfigFileSizeLimit = 64 * 1024;
// Trace config file path:
// - Android: /data/local/.config/chrome-trace-config.json
// - POSIX other than Android: $HOME/.config/chrome-trace-config.json
// - Win: %USERPROFILE%/.config/chrome-trace-config.json
#if defined(OS_ANDROID)
const base::FilePath::CharType kAndroidTraceConfigDir[] =
FILE_PATH_LITERAL("/data/local");
#endif
const base::FilePath::CharType kChromeConfigDir[] =
FILE_PATH_LITERAL(".config");
const base::FilePath::CharType kTraceConfigFileName[] =
FILE_PATH_LITERAL("chrome-trace-config.json");
base::FilePath GetTraceConfigFilePath() {
#if defined(OS_ANDROID)
base::FilePath path(kAndroidTraceConfigDir);
#elif defined(OS_POSIX) || defined(OS_WIN)
base::FilePath path;
PathService::Get(base::DIR_HOME, &path);
#else
base::FilePath path;
#endif
path = path.Append(kChromeConfigDir);
path = path.Append(kTraceConfigFileName);
return path;
}
} // namespace
void EnableStartupTracingIfConfigFileExists() {
base::FilePath trace_config_file_path = GetTraceConfigFilePath();
if (!base::PathExists(trace_config_file_path))
return;
std::string trace_config_str;
if (!base::ReadFileToString(trace_config_file_path,
&trace_config_str,
kTraceConfigFileSizeLimit)) {
return;
}
base::trace_event::TraceConfig trace_config(trace_config_str);
base::trace_event::TraceLog::GetInstance()->SetEnabled(
trace_config, base::trace_event::TraceLog::RECORDING_MODE);
}
} // namespace tracing
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