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#include "tracing_agent.h"
#include "main_thread_interface.h"
#include "node_internals.h"
#include "node_v8_platform-inl.h"
#include "v8.h"
#include <set>
#include <sstream>
namespace node {
namespace inspector {
namespace protocol {
namespace {
using v8::platform::tracing::TraceWriter;
class DeletableFrontendWrapper : public Deletable {
public:
explicit DeletableFrontendWrapper(
std::weak_ptr<NodeTracing::Frontend> frontend)
: frontend_(frontend) {}
// This should only be called from the main thread, meaning frontend should
// not be destroyed concurrently.
NodeTracing::Frontend* get() { return frontend_.lock().get(); }
private:
std::weak_ptr<NodeTracing::Frontend> frontend_;
};
class CreateFrontendWrapperRequest : public Request {
public:
CreateFrontendWrapperRequest(int object_id,
std::weak_ptr<NodeTracing::Frontend> frontend)
: object_id_(object_id) {
frontend_wrapper_ = std::make_unique<DeletableFrontendWrapper>(frontend);
}
void Call(MainThreadInterface* thread) override {
thread->AddObject(object_id_, std::move(frontend_wrapper_));
}
private:
int object_id_;
std::unique_ptr<DeletableFrontendWrapper> frontend_wrapper_;
};
class DestroyFrontendWrapperRequest : public Request {
public:
explicit DestroyFrontendWrapperRequest(int object_id)
: object_id_(object_id) {}
void Call(MainThreadInterface* thread) override {
thread->RemoveObject(object_id_);
}
private:
int object_id_;
};
class SendMessageRequest : public Request {
public:
explicit SendMessageRequest(int object_id, const std::string& message)
: object_id_(object_id), message_(message) {}
void Call(MainThreadInterface* thread) override {
DeletableFrontendWrapper* frontend_wrapper =
static_cast<DeletableFrontendWrapper*>(
thread->GetObjectIfExists(object_id_));
if (frontend_wrapper == nullptr) return;
auto frontend = frontend_wrapper->get();
if (frontend != nullptr) {
frontend->sendRawJSONNotification(message_);
}
}
private:
int object_id_;
std::string message_;
};
class InspectorTraceWriter : public node::tracing::AsyncTraceWriter {
public:
explicit InspectorTraceWriter(int frontend_object_id,
std::shared_ptr<MainThreadHandle> main_thread)
: frontend_object_id_(frontend_object_id), main_thread_(main_thread) {}
void AppendTraceEvent(
v8::platform::tracing::TraceObject* trace_event) override {
if (!json_writer_)
json_writer_.reset(TraceWriter::CreateJSONTraceWriter(stream_, "value"));
json_writer_->AppendTraceEvent(trace_event);
}
void Flush(bool) override {
if (!json_writer_)
return;
json_writer_.reset();
std::ostringstream result(
"{\"method\":\"NodeTracing.dataCollected\",\"params\":",
std::ostringstream::ate);
result << stream_.str();
result << "}";
main_thread_->Post(std::make_unique<SendMessageRequest>(frontend_object_id_,
result.str()));
stream_.str("");
}
private:
std::unique_ptr<TraceWriter> json_writer_;
std::ostringstream stream_;
int frontend_object_id_;
std::shared_ptr<MainThreadHandle> main_thread_;
};
} // namespace
TracingAgent::TracingAgent(Environment* env,
std::shared_ptr<MainThreadHandle> main_thread)
: env_(env), main_thread_(main_thread) {}
TracingAgent::~TracingAgent() {
trace_writer_.reset();
main_thread_->Post(
std::make_unique<DestroyFrontendWrapperRequest>(frontend_object_id_));
}
void TracingAgent::Wire(UberDispatcher* dispatcher) {
// Note that frontend is still owned by TracingAgent
frontend_ = std::make_shared<NodeTracing::Frontend>(dispatcher->channel());
frontend_object_id_ = main_thread_->newObjectId();
main_thread_->Post(std::make_unique<CreateFrontendWrapperRequest>(
frontend_object_id_, frontend_));
NodeTracing::Dispatcher::wire(dispatcher, this);
}
DispatchResponse TracingAgent::start(
std::unique_ptr<protocol::NodeTracing::TraceConfig> traceConfig) {
if (!trace_writer_.empty()) {
return DispatchResponse::Error(
"Call NodeTracing::end to stop tracing before updating the config");
}
if (!env_->owns_process_state()) {
return DispatchResponse::Error(
"Tracing properties can only be changed through main thread sessions");
}
std::set<std::string> categories_set;
protocol::Array<std::string>* categories =
traceConfig->getIncludedCategories();
for (size_t i = 0; i < categories->length(); i++)
categories_set.insert(categories->get(i));
if (categories_set.empty())
return DispatchResponse::Error("At least one category should be enabled");
tracing::AgentWriterHandle* writer = GetTracingAgentWriter();
if (writer != nullptr) {
trace_writer_ =
writer->agent()->AddClient(categories_set,
std::make_unique<InspectorTraceWriter>(
frontend_object_id_, main_thread_),
tracing::Agent::kIgnoreDefaultCategories);
}
return DispatchResponse::OK();
}
DispatchResponse TracingAgent::stop() {
trace_writer_.reset();
frontend_->tracingComplete();
return DispatchResponse::OK();
}
DispatchResponse TracingAgent::getCategories(
std::unique_ptr<protocol::Array<String>>* categories) {
*categories = Array<String>::create();
categories->get()->addItem("node");
categories->get()->addItem("node.async");
categories->get()->addItem("node.bootstrap");
categories->get()->addItem("node.fs.sync");
categories->get()->addItem("node.perf");
categories->get()->addItem("node.perf.usertiming");
categories->get()->addItem("node.perf.timerify");
categories->get()->addItem("v8");
return DispatchResponse::OK();
}
} // namespace protocol
} // namespace inspector
} // namespace node
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