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#include "tracing/agent.h"
#include <sstream>
#include <string>
#include "tracing/node_trace_buffer.h"
#include "tracing/node_trace_writer.h"
namespace node {
namespace tracing {
namespace {
class ScopedSuspendTracing {
public:
ScopedSuspendTracing(TracingController* controller, Agent* agent)
: controller_(controller), agent_(agent) {
controller->StopTracing();
}
~ScopedSuspendTracing() {
TraceConfig* config = agent_->CreateTraceConfig();
if (config != nullptr) {
controller_->StartTracing(config);
}
}
private:
TracingController* controller_;
Agent* agent_;
};
std::set<std::string> flatten(
const std::unordered_map<int, std::set<std::string>>& map) {
std::set<std::string> result;
for (const auto& id_value : map)
result.insert(id_value.second.begin(), id_value.second.end());
return result;
}
} // namespace
using v8::platform::tracing::TraceConfig;
using v8::platform::tracing::TraceWriter;
using std::string;
Agent::Agent(const std::string& log_file_pattern)
: log_file_pattern_(log_file_pattern) {
tracing_controller_ = new TracingController();
tracing_controller_->Initialize(nullptr);
}
void Agent::Start() {
if (started_)
return;
CHECK_EQ(uv_loop_init(&tracing_loop_), 0);
NodeTraceBuffer* trace_buffer_ = new NodeTraceBuffer(
NodeTraceBuffer::kBufferChunks, this, &tracing_loop_);
tracing_controller_->Initialize(trace_buffer_);
// This thread should be created *after* async handles are created
// (within NodeTraceWriter and NodeTraceBuffer constructors).
// Otherwise the thread could shut down prematurely.
CHECK_EQ(0, uv_thread_create(&thread_, [](void* arg) {
Agent* agent = static_cast<Agent*>(arg);
uv_run(&agent->tracing_loop_, UV_RUN_DEFAULT);
}, this));
started_ = true;
}
AgentWriterHandle Agent::AddClient(
const std::set<std::string>& categories,
std::unique_ptr<AsyncTraceWriter> writer) {
Start();
ScopedSuspendTracing suspend(tracing_controller_, this);
int id = next_writer_id_++;
writers_[id] = std::move(writer);
categories_[id] = categories;
return AgentWriterHandle(this, id);
}
void Agent::Stop() {
file_writer_.reset();
}
void Agent::StopTracing() {
if (!started_)
return;
// Perform final Flush on TraceBuffer. We don't want the tracing controller
// to flush the buffer again on destruction of the V8::Platform.
tracing_controller_->StopTracing();
tracing_controller_->Initialize(nullptr);
started_ = false;
// Thread should finish when the tracing loop is stopped.
uv_thread_join(&thread_);
}
void Agent::Disconnect(int client) {
ScopedSuspendTracing suspend(tracing_controller_, this);
writers_.erase(client);
categories_.erase(client);
}
void Agent::Enable(const std::string& categories) {
if (categories.empty())
return;
std::set<std::string> categories_set;
std::istringstream category_list(categories);
while (category_list.good()) {
std::string category;
getline(category_list, category, ',');
categories_set.emplace(std::move(category));
}
Enable(categories_set);
}
void Agent::Enable(const std::set<std::string>& categories) {
if (categories.empty())
return;
file_writer_categories_.insert(categories.begin(), categories.end());
std::set<std::string> full_list(file_writer_categories_.begin(),
file_writer_categories_.end());
if (file_writer_.empty()) {
// Ensure background thread is running
Start();
std::unique_ptr<NodeTraceWriter> writer(
new NodeTraceWriter(log_file_pattern_, &tracing_loop_));
file_writer_ = AddClient(full_list, std::move(writer));
} else {
ScopedSuspendTracing suspend(tracing_controller_, this);
categories_[file_writer_.id_] = full_list;
}
}
void Agent::Disable(const std::set<std::string>& categories) {
for (const std::string& category : categories) {
auto it = file_writer_categories_.find(category);
if (it != file_writer_categories_.end())
file_writer_categories_.erase(it);
}
if (file_writer_.empty())
return;
ScopedSuspendTracing suspend(tracing_controller_, this);
categories_[file_writer_.id_] = { file_writer_categories_.begin(),
file_writer_categories_.end() };
}
TraceConfig* Agent::CreateTraceConfig() const {
if (categories_.empty())
return nullptr;
TraceConfig* trace_config = new TraceConfig();
for (const auto& category : flatten(categories_)) {
trace_config->AddIncludedCategory(category.c_str());
}
return trace_config;
}
std::string Agent::GetEnabledCategories() const {
std::string categories;
for (const std::string& category : flatten(categories_)) {
if (!categories.empty())
categories += ',';
categories += category;
}
return categories;
}
void Agent::AppendTraceEvent(TraceObject* trace_event) {
for (const auto& id_writer : writers_)
id_writer.second->AppendTraceEvent(trace_event);
}
void Agent::Flush(bool blocking) {
for (const auto& id_writer : writers_)
id_writer.second->Flush(blocking);
}
} // namespace tracing
} // namespace node
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