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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 {
using v8::platform::tracing::TraceConfig;
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);
NodeTraceWriter* trace_writer =
new NodeTraceWriter(log_file_pattern_, &tracing_loop_);
TraceBuffer* trace_buffer = new NodeTraceBuffer(
NodeTraceBuffer::kBufferChunks, trace_writer, &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_, ThreadCb, this));
started_ = true;
}
void Agent::Stop() {
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_);
}
// static
void Agent::ThreadCb(void* arg) {
Agent* agent = static_cast<Agent*>(arg);
uv_run(&agent->tracing_loop_, UV_RUN_DEFAULT);
}
void Agent::Enable(const std::string& categories) {
if (!categories.empty()) {
std::stringstream category_list(categories);
while (category_list.good()) {
std::string category;
getline(category_list, category, ',');
categories_.insert(category.c_str());
}
RestartTracing();
}
}
void Agent::Enable(const std::set<std::string>& categories) {
if (!categories.empty()) {
categories_.insert(categories.begin(), categories.end());
RestartTracing();
}
}
void Agent::Disable(const std::set<std::string>& categories) {
if (!categories.empty()) {
for (auto category : categories) {
auto pos = categories_.lower_bound(category);
if (pos != categories_.end())
categories_.erase(pos);
}
RestartTracing();
}
}
void Agent::RestartTracing() {
static bool warned;
if (!warned) {
warned = true;
fprintf(stderr, "Warning: Trace event is an experimental feature "
"and could change at any time.\n");
}
Start(); // Start the agent if it hasn't already been started
tracing_controller_->StopTracing();
auto config = CreateTraceConfig();
if (config != nullptr)
tracing_controller_->StartTracing(config);
}
TraceConfig* Agent::CreateTraceConfig() {
if (categories_.empty())
return nullptr;
TraceConfig* trace_config = new TraceConfig();
for (auto category = categories_.begin();
category != categories_.end();
category = categories_.upper_bound(*category)) {
trace_config->AddIncludedCategory(category->c_str());
}
return trace_config;
}
std::string Agent::GetEnabledCategories() {
std::string categories;
for (auto category = categories_.begin();
category != categories_.end();
category = categories_.upper_bound(*category)) {
if (!categories.empty())
categories += ',';
categories += *category;
}
return categories;
}
} // namespace tracing
} // namespace node
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