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#include "inspector_profiler.h"
#include "base_object-inl.h"
#include "debug_utils.h"
#include "node_file.h"
#include "node_internals.h"
#include "v8-inspector.h"
namespace node {
namespace profiler {
using v8::Context;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::NewStringType;
using v8::Object;
using v8::String;
using v8::Value;
using v8_inspector::StringBuffer;
using v8_inspector::StringView;
#ifdef __POSIX__
const char* const kPathSeparator = "/";
#else
const char* const kPathSeparator = "\\/";
#endif
std::unique_ptr<StringBuffer> ToProtocolString(Isolate* isolate,
Local<Value> value) {
TwoByteValue buffer(isolate, value);
return StringBuffer::create(StringView(*buffer, buffer.length()));
}
V8ProfilerConnection::V8ProfilerConnection(Environment* env)
: session_(env->inspector_agent()->Connect(
std::make_unique<V8ProfilerConnection::V8ProfilerSessionDelegate>(
this),
false)),
env_(env) {}
void V8ProfilerConnection::DispatchMessage(Local<String> message) {
session_->Dispatch(ToProtocolString(env()->isolate(), message)->string());
}
bool V8ProfilerConnection::WriteResult(const char* path, Local<String> result) {
int ret = WriteFileSync(env()->isolate(), path, result);
if (ret != 0) {
char err_buf[128];
uv_err_name_r(ret, err_buf, sizeof(err_buf));
fprintf(stderr, "%s: Failed to write file %s\n", err_buf, path);
return false;
}
Debug(
env(), DebugCategory::INSPECTOR_PROFILER, "Written result to %s\n", path);
return true;
}
void V8CoverageConnection::OnMessage(const v8_inspector::StringView& message) {
Debug(env(),
DebugCategory::INSPECTOR_PROFILER,
"Receive coverage message, ending = %s\n",
ending_ ? "true" : "false");
if (!ending_) {
return;
}
Isolate* isolate = env()->isolate();
Local<Context> context = env()->context();
HandleScope handle_scope(isolate);
Context::Scope context_scope(context);
Local<String> result;
if (!String::NewFromTwoByte(isolate,
message.characters16(),
NewStringType::kNormal,
message.length())
.ToLocal(&result)) {
fprintf(stderr, "Failed to covert coverage message\n");
}
WriteCoverage(result);
}
bool V8CoverageConnection::WriteCoverage(Local<String> message) {
const std::string& directory = env()->coverage_directory();
CHECK(!directory.empty());
uv_fs_t req;
int ret = fs::MKDirpSync(nullptr, &req, directory, 0777, nullptr);
uv_fs_req_cleanup(&req);
if (ret < 0 && ret != UV_EEXIST) {
char err_buf[128];
uv_err_name_r(ret, err_buf, sizeof(err_buf));
fprintf(stderr,
"%s: Failed to create coverage directory %s\n",
err_buf,
directory.c_str());
return false;
}
std::string thread_id = std::to_string(env()->thread_id());
std::string pid = std::to_string(uv_os_getpid());
std::string timestamp = std::to_string(
static_cast<uint64_t>(GetCurrentTimeInMicroseconds() / 1000));
char filename[1024];
snprintf(filename,
sizeof(filename),
"coverage-%s-%s-%s.json",
pid.c_str(),
timestamp.c_str(),
thread_id.c_str());
std::string target = directory + kPathSeparator + filename;
MaybeLocal<String> result = GetResult(message);
if (result.IsEmpty()) {
return false;
}
return WriteResult(target.c_str(), result.ToLocalChecked());
}
MaybeLocal<String> V8CoverageConnection::GetResult(Local<String> message) {
Local<Context> context = env()->context();
Isolate* isolate = env()->isolate();
Local<Value> parsed;
if (!v8::JSON::Parse(context, message).ToLocal(&parsed) ||
!parsed->IsObject()) {
fprintf(stderr, "Failed to parse coverage result as JSON object\n");
return MaybeLocal<String>();
}
Local<Value> result_v;
if (!parsed.As<Object>()
->Get(context, FIXED_ONE_BYTE_STRING(isolate, "result"))
.ToLocal(&result_v)) {
fprintf(stderr, "Failed to get result from coverage message\n");
return MaybeLocal<String>();
}
if (result_v->IsUndefined()) {
fprintf(stderr, "'result' from coverage message is undefined\n");
return MaybeLocal<String>();
}
Local<String> result_s;
if (!v8::JSON::Stringify(context, result_v).ToLocal(&result_s)) {
fprintf(stderr, "Failed to stringify coverage result\n");
return MaybeLocal<String>();
}
return result_s;
}
void V8CoverageConnection::Start() {
Debug(env(),
DebugCategory::INSPECTOR_PROFILER,
"Sending Profiler.startPreciseCoverage\n");
Isolate* isolate = env()->isolate();
Local<String> enable = FIXED_ONE_BYTE_STRING(
isolate, R"({"id": 1, "method": "Profiler.enable"})");
Local<String> start = FIXED_ONE_BYTE_STRING(isolate, R"({
"id": 2,
"method": "Profiler.startPreciseCoverage",
"params": { "callCount": true, "detailed": true }
})");
DispatchMessage(enable);
DispatchMessage(start);
}
void V8CoverageConnection::End() {
CHECK_EQ(ending_, false);
ending_ = true;
Debug(env(),
DebugCategory::INSPECTOR_PROFILER,
"Sending Profiler.takePreciseCoverage\n");
Isolate* isolate = env()->isolate();
HandleScope scope(isolate);
Local<String> end = FIXED_ONE_BYTE_STRING(isolate, R"({
"id": 3,
"method": "Profiler.takePreciseCoverage"
})");
DispatchMessage(end);
}
// For now, we only support coverage profiling, but we may add more
// in the future.
void EndStartedProfilers(Environment* env) {
Debug(env, DebugCategory::INSPECTOR_PROFILER, "EndStartedProfilers\n");
V8ProfilerConnection* connection = env->coverage_connection();
if (connection != nullptr && !connection->ending()) {
Debug(
env, DebugCategory::INSPECTOR_PROFILER, "Ending coverage collection\n");
connection->End();
}
}
void StartCoverageCollection(Environment* env) {
CHECK_NULL(env->coverage_connection());
env->set_coverage_connection(std::make_unique<V8CoverageConnection>(env));
env->coverage_connection()->Start();
}
static void SetCoverageDirectory(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsString());
Environment* env = Environment::GetCurrent(args);
node::Utf8Value directory(env->isolate(), args[0].As<String>());
env->set_coverage_directory(*directory);
}
static void Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
env->SetMethod(target, "setCoverageDirectory", SetCoverageDirectory);
}
} // namespace profiler
} // namespace node
NODE_MODULE_CONTEXT_AWARE_INTERNAL(profiler, node::profiler::Initialize)
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