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agent.cc
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251 lines (212 loc) · 7.43 KB
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#include "tracing/agent.h"
#include <string>
#include "trace_event.h"
#include "tracing/node_trace_buffer.h"
#include "debug_utils-inl.h"
#include "env-inl.h"
namespace node {
namespace tracing {
class Agent::ScopedSuspendTracing {
public:
ScopedSuspendTracing(TracingController* controller, Agent* agent,
bool do_suspend = true)
: controller_(controller), agent_(do_suspend ? agent : nullptr) {
if (do_suspend) {
CHECK(agent_->started_);
controller->StopTracing();
}
}
~ScopedSuspendTracing() {
if (agent_ == nullptr) return;
TraceConfig* config = agent_->CreateTraceConfig();
if (config != nullptr) {
controller_->StartTracing(config);
}
}
private:
TracingController* controller_;
Agent* agent_;
};
namespace {
std::set<std::string> flatten(
const std::unordered_map<int, std::multiset<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() : tracing_controller_(new TracingController()) {
tracing_controller_->Initialize(nullptr);
CHECK_EQ(uv_loop_init(&tracing_loop_), 0);
CHECK_EQ(uv_async_init(&tracing_loop_,
&initialize_writer_async_,
[](uv_async_t* async) {
Agent* agent = ContainerOf(&Agent::initialize_writer_async_, async);
agent->InitializeWritersOnThread();
}), 0);
uv_unref(reinterpret_cast<uv_handle_t*>(&initialize_writer_async_));
}
void Agent::InitializeWritersOnThread() {
Mutex::ScopedLock lock(initialize_writer_mutex_);
while (!to_be_initialized_.empty()) {
AsyncTraceWriter* head = *to_be_initialized_.begin();
head->InitializeOnThread(&tracing_loop_);
to_be_initialized_.erase(head);
}
initialize_writer_condvar_.Broadcast(lock);
}
Agent::~Agent() {
categories_.clear();
writers_.clear();
StopTracing();
uv_close(reinterpret_cast<uv_handle_t*>(&initialize_writer_async_), nullptr);
uv_run(&tracing_loop_, UV_RUN_ONCE);
CheckedUvLoopClose(&tracing_loop_);
}
void Agent::Start() {
if (started_)
return;
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,
enum UseDefaultCategoryMode mode) {
Start();
const std::set<std::string>* use_categories = &categories;
std::set<std::string> categories_with_default;
if (mode == kUseDefaultCategories) {
categories_with_default.insert(categories.begin(), categories.end());
categories_with_default.insert(categories_[kDefaultHandleId].begin(),
categories_[kDefaultHandleId].end());
use_categories = &categories_with_default;
}
ScopedSuspendTracing suspend(tracing_controller_.get(), this);
int id = next_writer_id_++;
AsyncTraceWriter* raw = writer.get();
writers_[id] = std::move(writer);
categories_[id] = { use_categories->begin(), use_categories->end() };
{
Mutex::ScopedLock lock(initialize_writer_mutex_);
to_be_initialized_.insert(raw);
uv_async_send(&initialize_writer_async_);
while (to_be_initialized_.count(raw) > 0)
initialize_writer_condvar_.Wait(lock);
}
return AgentWriterHandle(this, id);
}
AgentWriterHandle Agent::DefaultHandle() {
return AgentWriterHandle(this, kDefaultHandleId);
}
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) {
if (client == kDefaultHandleId) return;
{
Mutex::ScopedLock lock(initialize_writer_mutex_);
to_be_initialized_.erase(writers_[client].get());
}
ScopedSuspendTracing suspend(tracing_controller_.get(), this);
writers_.erase(client);
categories_.erase(client);
}
void Agent::Enable(int id, const std::set<std::string>& categories) {
if (categories.empty())
return;
ScopedSuspendTracing suspend(tracing_controller_.get(), this,
id != kDefaultHandleId);
categories_[id].insert(categories.begin(), categories.end());
}
void Agent::Disable(int id, const std::set<std::string>& categories) {
ScopedSuspendTracing suspend(tracing_controller_.get(), this,
id != kDefaultHandleId);
std::multiset<std::string>& writer_categories = categories_[id];
for (const std::string& category : categories) {
auto it = writer_categories.find(category);
if (it != writer_categories.end())
writer_categories.erase(it);
}
}
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::AddMetadataEvent(std::unique_ptr<TraceObject> event) {
Mutex::ScopedLock lock(metadata_events_mutex_);
metadata_events_.push_back(std::move(event));
}
void Agent::Flush(bool blocking) {
{
Mutex::ScopedLock lock(metadata_events_mutex_);
for (const auto& event : metadata_events_)
AppendTraceEvent(event.get());
}
for (const auto& id_writer : writers_)
id_writer.second->Flush(blocking);
}
void TracingController::AddMetadataEvent(
const unsigned char* category_group_enabled,
const char* name,
int num_args,
const char** arg_names,
const unsigned char* arg_types,
const uint64_t* arg_values,
std::unique_ptr<v8::ConvertableToTraceFormat>* convertable_values,
unsigned int flags) {
std::unique_ptr<TraceObject> trace_event(new TraceObject);
trace_event->Initialize(
TRACE_EVENT_PHASE_METADATA, category_group_enabled, name,
node::tracing::kGlobalScope, // scope
node::tracing::kNoId, // id
node::tracing::kNoId, // bind_id
num_args, arg_names, arg_types, arg_values, convertable_values,
TRACE_EVENT_FLAG_NONE,
CurrentTimestampMicroseconds(),
CurrentCpuTimestampMicroseconds());
Agent* node_agent = node::tracing::TraceEventHelper::GetAgent();
if (node_agent != nullptr)
node_agent->AddMetadataEvent(std::move(trace_event));
}
} // namespace tracing
} // namespace node