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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/tracing/public/cpp/perfetto/perfetto_traced_process.h"
#include "services/tracing/public/cpp/perfetto/trace_event_data_source.h"
#include "services/tracing/public/cpp/stack_sampling/tracing_sampler_profiler.h"
#include "services/tracing/public/cpp/trace_event_args_whitelist.h"
#include "services/tracing/public/cpp/tracing_features.h"
namespace {
const char kTraceEventLabel[] = "traceEvents";
} // namespace
namespace tracing {
// static
TraceEventAgent* TraceEventAgent::GetInstance() {
static base::NoDestructor<TraceEventAgent> instance;
return instance.get();
}
TraceEventAgent::TraceEventAgent()
: BaseAgent(kTraceEventLabel,
mojom::TraceDataType::ARRAY,
base::trace_event::TraceLog::GetInstance()->process_id()),
enabled_tracing_modes_(0),
weak_ptr_factory_(this) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
// These filters are used by TraceLog in the legacy tracing system and JSON
// exporter (only in tracing service) in perfetto bcakend.
if (base::trace_event::TraceLog::GetInstance()
->GetArgumentFilterPredicate()
.is_null()) {
base::trace_event::TraceLog::GetInstance()->SetArgumentFilterPredicate(
base::BindRepeating(&IsTraceEventArgsWhitelisted));
base::trace_event::TraceLog::GetInstance()->SetMetadataFilterPredicate(
base::BindRepeating(&IsMetadataWhitelisted));
}
PerfettoTracedProcess::Get()->AddDataSource(
TraceEventDataSource::GetInstance());
TracingSamplerProfiler::RegisterDataSource();
}
TraceEventAgent::~TraceEventAgent() = default;
void TraceEventAgent::GetCategories(std::set<std::string>* category_set) {
for (size_t i = base::trace_event::BuiltinCategories::kVisibleCategoryStart;
i < base::trace_event::BuiltinCategories::Size(); ++i) {
category_set->insert(base::trace_event::BuiltinCategories::At(i));
}
}
void TraceEventAgent::AddMetadataGeneratorFunction(
MetadataGeneratorFunction generator) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
metadata_generator_functions_.push_back(generator);
TraceEventMetadataSource::GetInstance()->AddGeneratorFunction(generator);
}
void TraceEventAgent::StartTracing(const std::string& config,
base::TimeTicks coordinator_time,
StartTracingCallback callback) {
DCHECK(!IsBoundForTesting() || !TracingUsesPerfettoBackend());
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 TraceEventAgent::StopAndFlush(mojom::RecorderPtr recorder) {
DCHECK(!IsBoundForTesting() || !TracingUsesPerfettoBackend());
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));
}
base::trace_event::TraceLog::GetInstance()->Flush(
base::Bind(&TraceEventAgent::OnTraceLogFlush, base::Unretained(this)));
}
void TraceEventAgent::RequestBufferStatus(
RequestBufferStatusCallback callback) {
DCHECK(!IsBoundForTesting() || !TracingUsesPerfettoBackend());
base::trace_event::TraceLogStatus status =
base::trace_event::TraceLog::GetInstance()->GetStatus();
std::move(callback).Run(status.event_capacity, status.event_count);
}
void TraceEventAgent::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) {
recorder_.reset();
}
}
} // namespace tracing
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