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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/trace_config_file.h" | |
| 6 | |
| 7 #include <string> | |
| 8 | |
| 9 #include "base/command_line.h" | |
| 10 #include "base/files/file_util.h" | |
| 11 #include "base/json/json_reader.h" | |
| 12 #include "base/json/json_writer.h" | |
| 13 #include "base/logging.h" | |
| 14 #include "base/memory/singleton.h" | |
| 15 #include "base/values.h" | |
| 16 #include "components/tracing/tracing_switches.h" | |
| 17 | |
| 18 namespace tracing { | |
| 19 | |
| 20 namespace { | |
| 21 | |
| 22 // Maximum trace config file size that will be loaded, in bytes. | |
| 23 const size_t kTraceConfigFileSizeLimit = 64 * 1024; | |
| 24 | |
| 25 // Trace config file path: | |
| 26 // - Android: /data/local/chrome-trace-config.json | |
| 27 // - Others: specified by --trace-config-file flag. | |
| 28 #if defined(OS_ANDROID) | |
| 29 const base::FilePath::CharType kAndroidTraceConfigFile[] = | |
| 30 FILE_PATH_LITERAL("/data/local/chrome-trace-config.json"); | |
| 31 #endif | |
| 32 | |
| 33 const base::FilePath::CharType kDefaultResultFile[] = | |
| 34 FILE_PATH_LITERAL("chrometrace.log"); | |
| 35 | |
| 36 // String parameters that can be used to parse the trace config file content. | |
| 37 const char kTraceConfigParam[] = "trace_config"; | |
| 38 const char kStartupDurationParam[] = "startup_duration"; | |
| 39 const char kResultFileParam[] = "result_file"; | |
| 40 | |
| 41 } // namespace | |
| 42 | |
| 43 TraceConfigFile* TraceConfigFile::GetInstance() { | |
| 44 return Singleton<TraceConfigFile, | |
| 45 DefaultSingletonTraits<TraceConfigFile>>::get(); | |
| 46 } | |
| 47 | |
| 48 TraceConfigFile::TraceConfigFile() | |
| 49 : is_enabled_(false), | |
| 50 trace_config_(base::trace_event::TraceConfig()), | |
| 51 startup_duration_(0), | |
| 52 result_file_(kDefaultResultFile) { | |
| 53 #if defined(OS_ANDROID) | |
| 54 base::FilePath trace_config_file(kAndroidTraceConfigFile); | |
| 55 #else | |
| 56 const base::CommandLine& command_line = | |
| 57 *base::CommandLine::ForCurrentProcess(); | |
| 58 if (!command_line.HasSwitch(switches::kTraceConfigFile) || | |
| 59 command_line.HasSwitch(switches::kTraceStartup) || | |
| 60 command_line.HasSwitch(switches::kTraceShutdown)) { | |
| 61 return; | |
| 62 } | |
| 63 base::FilePath trace_config_file = | |
| 64 command_line.GetSwitchValuePath(switches::kTraceConfigFile); | |
| 65 #endif | |
| 66 | |
| 67 if (trace_config_file.empty()) { | |
| 68 // If the trace config file path is not specified, trace Chrome with the | |
| 69 // default configuration for 5 sec. | |
| 70 startup_duration_ = 5; | |
| 71 is_enabled_ = true; | |
| 72 return; | |
| 73 } | |
| 74 | |
| 75 if (!base::PathExists(trace_config_file)) | |
| 76 return; | |
| 77 | |
| 78 std::string trace_config_file_content; | |
| 79 if (!base::ReadFileToString(trace_config_file, | |
| 80 &trace_config_file_content, | |
| 81 kTraceConfigFileSizeLimit)) { | |
| 82 return; | |
| 83 } | |
| 84 is_enabled_ = ParseTraceConfigFileContent(trace_config_file_content); | |
| 85 } | |
| 86 | |
| 87 TraceConfigFile::~TraceConfigFile() { | |
| 88 } | |
| 89 | |
| 90 bool TraceConfigFile::ParseTraceConfigFileContent(std::string content) { | |
| 91 scoped_ptr<base::Value> value(base::JSONReader::Read(content)); | |
| 92 if (!value || !value->IsType(base::Value::TYPE_DICTIONARY)) | |
| 93 return false; | |
| 94 | |
| 95 scoped_ptr<base::DictionaryValue> dict( | |
| 96 static_cast<base::DictionaryValue*>(value.release())); | |
| 97 | |
| 98 base::DictionaryValue* trace_config_dict = NULL; | |
| 99 if (!dict->GetDictionary(kTraceConfigParam, &trace_config_dict)) | |
| 100 return false; | |
| 101 | |
| 102 std::string trace_config_str; | |
| 103 base::JSONWriter::Write(*trace_config_dict, &trace_config_str); | |
| 104 trace_config_ = base::trace_event::TraceConfig(trace_config_str); | |
| 105 | |
| 106 if (!dict->GetInteger(kStartupDurationParam, &startup_duration_)) | |
| 107 startup_duration_ = 0; | |
| 108 | |
| 109 if (startup_duration_ < 0) | |
| 110 startup_duration_ = 0; | |
| 111 | |
| 112 std::string result_file_str; | |
| 113 if (dict->GetString(kResultFileParam, &result_file_str)) | |
| 114 result_file_ = base::FilePath().AppendASCII(result_file_str); | |
| 115 | |
| 116 return true; | |
| 117 } | |
| 118 | |
| 119 bool TraceConfigFile::IsEnabled() const { | |
| 120 return is_enabled_; | |
| 121 } | |
| 122 | |
| 123 base::trace_event::TraceConfig TraceConfigFile::GetTraceConfig() const { | |
| 124 DCHECK(IsEnabled()); | |
| 125 return trace_config_; | |
| 126 } | |
| 127 | |
| 128 int TraceConfigFile::GetStartupDuration() const { | |
| 129 DCHECK(IsEnabled()); | |
| 130 return startup_duration_; | |
| 131 } | |
| 132 | |
| 133 #if !defined(OS_ANDROID) | |
| 134 base::FilePath TraceConfigFile::GetResultFile() const { | |
| 135 DCHECK(IsEnabled()); | |
| 136 return result_file_; | |
| 137 } | |
| 138 #endif | |
| 139 | |
| 140 } // namespace tracing | |
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Chromium Code Reviews
Issue 1319093002:
Revert of [Startup Tracing] Add --trace-config-file flag (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master