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Issue 1309243004: Reland again [Startup Tracing] Add --trace-config-file flag (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: fix unit test Created 5 years, 3 months ago
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1 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "components/tracing/startup_tracing.h"
6
7 #include "base/files/file_path.h"
8 #include "base/files/file_util.h"
9 #include "base/path_service.h"
10 #include "base/trace_event/trace_event.h"
11
12 namespace tracing {
13
14 namespace {
15
16 // Maximum trace config file size that will be loaded, in bytes.
17 const size_t kTraceConfigFileSizeLimit = 64 * 1024;
18
19 // Trace config file path:
20 // - Android: /data/local/.config/chrome-trace-config.json
21 // - POSIX other than Android: $HOME/.config/chrome-trace-config.json
22 // - Win: %USERPROFILE%/.config/chrome-trace-config.json
23 #if defined(OS_ANDROID)
24 const base::FilePath::CharType kAndroidTraceConfigDir[] =
25 FILE_PATH_LITERAL("/data/local");
26 #endif
27
28 const base::FilePath::CharType kChromeConfigDir[] =
29 FILE_PATH_LITERAL(".config");
30 const base::FilePath::CharType kTraceConfigFileName[] =
31 FILE_PATH_LITERAL("chrome-trace-config.json");
32
33 base::FilePath GetTraceConfigFilePath() {
34 #if defined(OS_ANDROID)
35 base::FilePath path(kAndroidTraceConfigDir);
36 #elif defined(OS_POSIX) || defined(OS_WIN)
37 base::FilePath path;
38 PathService::Get(base::DIR_HOME, &path);
39 #else
40 base::FilePath path;
41 #endif
42 path = path.Append(kChromeConfigDir);
43 path = path.Append(kTraceConfigFileName);
44 return path;
45 }
46
47 } // namespace
48
49 void EnableStartupTracingIfConfigFileExists() {
50 base::FilePath trace_config_file_path = GetTraceConfigFilePath();
51 if (!base::PathExists(trace_config_file_path))
52 return;
53
54 std::string trace_config_str;
55 if (!base::ReadFileToString(trace_config_file_path,
56 &trace_config_str,
57 kTraceConfigFileSizeLimit)) {
58 return;
59 }
60
61 base::trace_event::TraceConfig trace_config(trace_config_str);
62 base::trace_event::TraceLog::GetInstance()->SetEnabled(
63 trace_config, base::trace_event::TraceLog::RECORDING_MODE);
64 }
65
66 } // namespace tracing
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