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// Copyright 2025 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/tracing/common/tracing_scenarios_config.h"
#include <memory>
#include <string>
#include <utility>
#include "base/base64.h"
#include "base/check.h"
#include "base/command_line.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/task/task_traits.h"
#include "components/tracing/common/tracing_switches.h"
#include "third_party/snappy/src/snappy.h"
namespace tracing {
BASE_FEATURE(kTracingTriggers,
"TracingTriggers",
base::FEATURE_DISABLED_BY_DEFAULT);
BASE_FEATURE(kFieldTracing, "FieldTracing", base::FEATURE_DISABLED_BY_DEFAULT);
BASE_FEATURE(kPresetTracing,
"PresetTracing",
base::FEATURE_DISABLED_BY_DEFAULT);
BASE_FEATURE_PARAM(bool,
kFieldTracingAnonymized,
&kFieldTracing,
"anonymized",
true);
BASE_FEATURE_PARAM(bool,
kFieldTracingForceUploads,
&kFieldTracing,
"force_uploads",
false);
BASE_FEATURE_PARAM(size_t,
kFieldTracingUploadLimitKb,
&kFieldTracing,
"upload_limit_kb",
0);
BASE_FEATURE_PARAM(bool,
kStartupFieldTracing,
&kFieldTracing,
"startup",
false);
namespace {
const base::FeatureParam<std::string> kTracingTriggerRulesConfig{
&kTracingTriggers, "config", ""};
const base::FeatureParam<std::string> kFieldTracingConfig{&kFieldTracing,
"config", ""};
const base::FeatureParam<std::string> kPresetTracingConfig{&kPresetTracing,
"config", ""};
} // namespace
std::optional<perfetto::protos::gen::ChromeFieldTracingConfig>
GetPresetTracingScenariosConfig() {
if (!base::FeatureList::IsEnabled(kPresetTracing)) {
return std::nullopt;
}
return ParseEncodedTracingScenariosConfig(kPresetTracingConfig.Get());
}
std::optional<perfetto::protos::gen::ChromeFieldTracingConfig>
GetFieldTracingScenariosConfig() {
if (!base::FeatureList::IsEnabled(kFieldTracing)) {
return std::nullopt;
}
return ParseEncodedTracingScenariosConfig(kFieldTracingConfig.Get());
}
std::optional<perfetto::protos::gen::TracingTriggerRulesConfig>
GetTracingTriggerRulesConfig() {
if (!base::FeatureList::IsEnabled(kTracingTriggers)) {
return std::nullopt;
}
std::string serialized_config;
if (!base::Base64Decode(kTracingTriggerRulesConfig.Get(),
&serialized_config)) {
return std::nullopt;
}
// `serialized_config` may optionally be compressed.
std::string decompressed_config;
if (snappy::Uncompress(serialized_config.data(), serialized_config.size(),
&decompressed_config)) {
serialized_config = std::move(decompressed_config);
}
perfetto::protos::gen::TracingTriggerRulesConfig config;
if (config.ParseFromString(serialized_config)) {
return config;
}
return std::nullopt;
}
std::optional<perfetto::protos::gen::ChromeFieldTracingConfig>
ParseSerializedTracingScenariosConfig(
const base::span<const uint8_t>& config_bytes) {
perfetto::protos::gen::ChromeFieldTracingConfig config;
if (config_bytes.empty()) {
return std::nullopt;
}
if (config.ParseFromArray(config_bytes.data(), config_bytes.size())) {
return config;
}
return std::nullopt;
}
std::optional<perfetto::protos::gen::ChromeFieldTracingConfig>
ParseEncodedTracingScenariosConfig(const std::string& config_string) {
std::string serialized_config;
if (!base::Base64Decode(config_string, &serialized_config,
base::Base64DecodePolicy::kForgiving)) {
return std::nullopt;
}
// `serialized_config` may optionally be compressed.
std::string decompressed_config;
if (!snappy::Uncompress(serialized_config.data(), serialized_config.size(),
&decompressed_config)) {
return ParseSerializedTracingScenariosConfig(
base::as_byte_span(serialized_config));
}
return ParseSerializedTracingScenariosConfig(
base::as_byte_span(decompressed_config));
}
bool IsBackgroundTracingEnabledFromCommandLine() {
auto* command_line = base::CommandLine::ForCurrentProcess();
return command_line->HasSwitch(switches::kEnableBackgroundTracing);
}
} // namespace tracing
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