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// Copyright 2017 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 "services/tracing/public/cpp/trace_event_agent.h"
#include <string>
#include <utility>
#include <vector>
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "base/memory/ref_counted_memory.h"
#include "base/no_destructor.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "base/trace_event/trace_log.h"
#include "base/values.h"
#include "build/build_config.h"
#include "services/service_manager/public/cpp/connector.h"
#include "services/tracing/public/cpp/tracing_features.h"
#include "services/tracing/public/mojom/constants.mojom.h"
#if 0
#define PERFETTO_AVAILABLE
#include "services/tracing/public/cpp/perfetto/producer_client.h"
#include "services/tracing/public/cpp/perfetto/trace_event_data_source.h"
#include "third_party/perfetto/include/perfetto/tracing/core/trace_writer.h"
#include "third_party/perfetto/protos/perfetto/trace/chrome/chrome_trace_event.pbzero.h"
#include "third_party/perfetto/protos/perfetto/trace/trace_packet.pbzero.h"
#endif
namespace {
const char kTraceEventLabel[] = "traceEvents";
} // namespace
namespace tracing {
#if defined(PERFETTO_AVAILABLE)
namespace {
ProducerClient* GetProducerClient() {
static base::NoDestructor<ProducerClient> producer_client;
return producer_client.get();
}
} // namespace
class PerfettoTraceEventAgent : public TraceEventAgent {
public:
PerfettoTraceEventAgent(service_manager::Connector* connector,
bool request_clock_sync_marker_on_android)
: TraceEventAgent(connector, request_clock_sync_marker_on_android) {
mojom::PerfettoServicePtr perfetto_service;
connector->BindInterface(mojom::kServiceName, &perfetto_service);
GetProducerClient()->CreateMojoMessagepipes(base::BindOnce(
[](mojom::PerfettoServicePtr perfetto_service,
mojom::ProducerClientPtr producer_client_pipe,
mojom::ProducerHostRequest producer_host_pipe) {
perfetto_service->ConnectToProducerHost(
std::move(producer_client_pipe), std::move(producer_host_pipe));
},
std::move(perfetto_service)));
GetProducerClient()->AddDataSource(TraceEventDataSource::GetInstance());
}
void AddMetadataGeneratorFunction(
MetadataGeneratorFunction generator) override {
// Instantiate and register the metadata data source on the first
// call.
static TraceEventMetadataSource* metadata_source = []() {
static base::NoDestructor<TraceEventMetadataSource> instance;
GetProducerClient()->AddDataSource(instance.get());
return instance.get();
}();
metadata_source->AddGeneratorFunction(generator);
}
};
#endif
// static
std::unique_ptr<TraceEventAgent> TraceEventAgent::Create(
service_manager::Connector* connector,
bool request_clock_sync_marker_on_android) {
std::unique_ptr<TraceEventAgent> new_agent;
if (TracingUsesPerfettoBackend()) {
#if defined(PERFETTO_AVAILABLE)
new_agent = std::make_unique<PerfettoTraceEventAgent>(
connector, request_clock_sync_marker_on_android);
#else
LOG(ERROR) << "Perfetto is not yet available for this platform; falling "
"back to using legacy TraceLog";
#endif
}
// Use legacy tracing if we're on an unsupported platform or the feature flag
// is disabled.
if (!new_agent) {
new_agent = std::make_unique<LegacyTraceEventAgent>(
connector, request_clock_sync_marker_on_android);
}
return new_agent;
}
TraceEventAgent::TraceEventAgent(service_manager::Connector* connector,
bool request_clock_sync_marker_on_android)
: BaseAgent(connector,
kTraceEventLabel,
mojom::TraceDataType::ARRAY,
#if defined(OS_ANDROID)
request_clock_sync_marker_on_android,
#else
false,
#endif
base::trace_event::TraceLog::GetInstance()->process_id()) {
}
TraceEventAgent::~TraceEventAgent() = default;
void TraceEventAgent::RequestClockSyncMarker(
const std::string& sync_id,
Agent::RequestClockSyncMarkerCallback callback) {
#if defined(OS_ANDROID)
base::trace_event::TraceLog::GetInstance()->AddClockSyncMetadataEvent();
std::move(callback).Run(base::TimeTicks(), base::TimeTicks());
#else
NOTREACHED();
#endif
}
void TraceEventAgent::GetCategories(GetCategoriesCallback callback) {
std::vector<std::string> category_vector;
base::trace_event::TraceLog::GetInstance()->GetKnownCategoryGroups(
&category_vector);
std::move(callback).Run(base::JoinString(category_vector, ","));
}
LegacyTraceEventAgent::LegacyTraceEventAgent(
service_manager::Connector* connector,
bool request_clock_sync_marker_on_android)
: TraceEventAgent(connector, request_clock_sync_marker_on_android),
enabled_tracing_modes_(0) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
}
LegacyTraceEventAgent::~LegacyTraceEventAgent() {
DCHECK(!trace_log_needs_me_);
}
void LegacyTraceEventAgent::AddMetadataGeneratorFunction(
MetadataGeneratorFunction generator) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
metadata_generator_functions_.push_back(generator);
}
void LegacyTraceEventAgent::StartTracing(const std::string& config,
base::TimeTicks coordinator_time,
StartTracingCallback callback) {
DCHECK(!recorder_);
#if defined(__native_client__)
// NaCl and system times are offset by a bit, so subtract some time from
// the captured timestamps. The value might be off by a bit due to messaging
// latency.
base::TimeDelta time_offset = TRACE_TIME_TICKS_NOW() - coordinator_time;
TraceLog::GetInstance()->SetTimeOffset(time_offset);
#endif
enabled_tracing_modes_ = base::trace_event::TraceLog::RECORDING_MODE;
const base::trace_event::TraceConfig trace_config(config);
if (!trace_config.event_filters().empty())
enabled_tracing_modes_ |= base::trace_event::TraceLog::FILTERING_MODE;
base::trace_event::TraceLog::GetInstance()->SetEnabled(
trace_config, enabled_tracing_modes_);
std::move(callback).Run(true);
}
void LegacyTraceEventAgent::StopAndFlush(mojom::RecorderPtr recorder) {
DCHECK(!recorder_);
recorder_ = std::move(recorder);
base::trace_event::TraceLog::GetInstance()->SetDisabled(
enabled_tracing_modes_);
enabled_tracing_modes_ = 0;
for (const auto& generator : metadata_generator_functions_) {
auto metadata = generator.Run();
if (metadata)
recorder_->AddMetadata(std::move(*metadata));
}
trace_log_needs_me_ = true;
base::trace_event::TraceLog::GetInstance()->Flush(base::Bind(
&LegacyTraceEventAgent::OnTraceLogFlush, base::Unretained(this)));
}
void LegacyTraceEventAgent::RequestBufferStatus(
RequestBufferStatusCallback callback) {
base::trace_event::TraceLogStatus status =
base::trace_event::TraceLog::GetInstance()->GetStatus();
std::move(callback).Run(status.event_capacity, status.event_count);
}
void LegacyTraceEventAgent::OnTraceLogFlush(
const scoped_refptr<base::RefCountedString>& events_str,
bool has_more_events) {
if (!events_str->data().empty())
recorder_->AddChunk(events_str->data());
if (!has_more_events) {
trace_log_needs_me_ = false;
recorder_.reset();
}
}
} // namespace tracing
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