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#include <chrono>
#include <future>
#include <mutex>
#include <node.h>
#include <node_version.h>
#include <optional>
#include <vector>
// Platform-specific includes for time functions
#ifdef _WIN32
#include <windows.h>
#elif defined(__APPLE__)
#include <time.h>
#elif defined(__linux__)
#include <time.h>
#endif
#ifndef NODE_MAJOR_VERSION
#error "NODE_MAJOR_VERSION is not defined"
#endif
#define SUPPORTS_ASYNC_CONTEXT_FRAME NODE_MAJOR_VERSION >= 22
#define GET_CONTINUATION_PRESERVED_EMBEDDER_DATA_V2 V8_MAJOR_VERSION >= 14
using namespace v8;
using namespace node;
using namespace std::chrono;
static const int kMaxStackFrames = 50;
struct AsyncLocalStorageLookup {
// Async local storage instance associated with this thread
v8::Global<v8::Value> async_local_storage;
// Optional ordered array of keys (string | symbol) to traverse nested
// Map/Object structures to fetch the final state object
std::optional<std::vector<v8::Global<v8::Value>>> storage_keys;
};
// Structure to hold information for each thread/isolate
struct ThreadInfo {
// Thread name
std::string thread_name;
// Last time this thread was seen in milliseconds since epoch
milliseconds last_seen;
// Optional async local storage associated with this thread
std::optional<AsyncLocalStorageLookup> async_store;
// Some JSON serialized state sent via threadPoll
std::string poll_state;
};
static std::mutex threads_mutex;
// Map to hold all registered threads and their information
static std::unordered_map<v8::Isolate *, ThreadInfo> threads = {};
// Structure to hold stack frame information
struct JsStackFrame {
std::string function_name;
std::string filename;
int lineno;
int colno;
};
// Type alias for a vector of JsStackFrame
using JsStackFrames = std::vector<JsStackFrame>;
struct JsStackTrace {
// The frames in the stack trace
JsStackFrames frames;
// JSON serialized string of the async state
std::string async_state;
};
struct ThreadResult {
std::string thread_name;
JsStackTrace stack_trace;
// JSON serialized string of the poll state
std::string poll_state;
};
// Recursively sanitize a value to be safely JSON-stringifiable by:
// - Removing properties whose values are BigInt, Function, or Symbol
// (dropped for objects, omitted from arrays)
// - Breaking cycles by omitting repeated objects (undefined -> dropped/omitted)
// - Preserving primitives and traversing arrays/objects
static v8::Local<v8::Value>
SanitizeForJSON(v8::Isolate *isolate, v8::Local<v8::Context> context,
v8::Local<v8::Value> value,
std::vector<v8::Local<v8::Object>> &ancestors) {
// Fast-path for primitives that are always JSON-compatible
if (value->IsNull() || value->IsBoolean() || value->IsNumber() ||
value->IsString()) {
return value;
}
// Values that JSON.stringify cannot handle directly
if (value->IsBigInt() || value->IsSymbol() || value->IsFunction() ||
value->IsUndefined()) {
// Returning undefined here lets callers decide to drop (object) or null
// (array)
return v8::Undefined(isolate);
}
// Arrays
if (value->IsArray()) {
auto arr = value.As<v8::Array>();
// Cycle detection
auto arr_obj = value.As<v8::Object>();
for (auto &a : ancestors) {
if (a->StrictEquals(arr_obj)) {
return v8::Undefined(isolate);
}
}
auto length = arr->Length();
auto out = v8::Array::New(isolate, 0);
ancestors.push_back(arr_obj);
uint32_t out_index = 0;
for (uint32_t i = 0; i < length; ++i) {
auto maybeEl = arr->Get(context, i);
v8::Local<v8::Value> el;
if (!maybeEl.ToLocal(&el)) {
el = v8::Undefined(isolate);
}
auto sanitized = SanitizeForJSON(isolate, context, el, ancestors);
if (!sanitized->IsUndefined()) {
out->Set(context, out_index++, sanitized)
.Check(); // omit undefined entries entirely
}
}
ancestors.pop_back();
return out;
}
// Objects (including Dates, RegExps, Maps as objects; we only traverse
// enumerable own props)
if (value->IsObject()) {
auto obj = value.As<v8::Object>();
// Cycle detection
for (auto &a : ancestors) {
if (a->StrictEquals(obj)) {
return v8::Undefined(isolate);
}
}
ancestors.push_back(obj);
// Collect own enumerable property names (string-keyed)
auto maybe_props = obj->GetPropertyNa
10000
mes(context);
if (maybe_props.IsEmpty()) {
ancestors.pop_back();
return obj; // Nothing enumerable to sanitize
}
auto props = maybe_props.ToLocalChecked();
auto out = v8::Object::New(isolate);
auto len = props->Length();
for (uint32_t i = 0; i < len; ++i) {
auto maybeKey = props->Get(context, i);
if (maybeKey.IsEmpty())
continue;
auto key = maybeKey.ToLocalChecked();
if (!key->IsString()) {
// Skip symbol and non-string keys to match JSON behavior
continue;
}
auto maybeVal = obj->Get(context, key);
if (maybeVal.IsEmpty())
continue;
auto val = maybeVal.ToLocalChecked();
auto sanitized = SanitizeForJSON(isolate, context, val, ancestors);
if (!sanitized->IsUndefined()) {
out->Set(context, key, sanitized).Check();
}
// else: undefined -> drop property
}
ancestors.pop_back();
return out;
}
// Fallback: return as-is (shouldn't hit here for other exotic types)
return value;
}
std::string JSONStringify(Isolate *isolate, Local<Value> value) {
auto context = isolate->GetCurrentContext();
// Sanitize the value first to avoid JSON failures (e.g., BigInt, cycles)
std::vector<v8::Local<v8::Object>> ancestors;
auto sanitized = SanitizeForJSON(isolate, context, value, ancestors);
if (sanitized->IsUndefined()) {
// Nothing serializable
return "";
}
auto maybe_json = v8::JSON::Stringify(context, sanitized);
if (maybe_json.IsEmpty()) {
return "";
}
v8::String::Utf8Value utf8(isolate, maybe_json.ToLocalChecked());
return *utf8 ? *utf8 : "";
}
// Function to get stack frames from a V8 stack trace
JsStackFrames GetStackFrames(Isolate *isolate) {
auto stack = StackTrace::CurrentStackTrace(isolate, kMaxStackFrames,
StackTrace::kDetailed);
JsStackFrames frames;
if (!stack.IsEmpty()) {
for (int i = 0; i < stack->GetFrameCount(); i++) {
auto frame = stack->GetFrame(isolate, i);
auto fn_name = frame->GetFunctionName();
std::string function_name;
if (frame->IsEval()) {
function_name = "[eval]";
} else if (fn_name.IsEmpty() || fn_name->Length() == 0) {
function_name = "?";
} else if (frame->IsConstructor()) {
function_name = "[constructor]";
} else {
v8::String::Utf8Value utf8_fn(isolate, fn_name);
function_name = *utf8_fn ? *utf8_fn : "?";
}
std::string filename;
auto script_name = frame->GetScriptName();
if (!script_name.IsEmpty()) {
v8::String::Utf8Value utf8_filename(isolate, script_name);
filename = *utf8_filename ? *utf8_filename : "<unknown>";
} else {
filename = "<unknown>";
}
int lineno = frame->GetLineNumber();
int colno = frame->GetColumn();
frames.push_back(JsStackFrame{function_name, filename, lineno, colno});
}
}
return frames;
}
#if SUPPORTS_ASYNC_CONTEXT_FRAME
// Function to fetch the thread state from the async context store
std::string GetThreadState(Isolate *isolate,
const AsyncLocalStorageLookup &store) {
// Node.js stores the async local storage in the isolate's
// "ContinuationPreservedEmbedderData" map, keyed by the
// AsyncLocalStorage instance.
// https://github.com/nodejs/node/blob/c6316f9db9869864cea84e5f07585fa08e3e06d2/src/async_context_frame.cc#L37
#if GET_CONTINUATION_PRESERVED_EMBEDDER_DATA_V2
auto data = isolate->GetContinuationPreservedEmbedderDataV2().As<Value>();
#else
auto data = isolate->GetContinuationPreservedEmbedderData();
#endif
auto async_local_storage_local = store.async_local_storage.Get(isolate);
if (data.IsEmpty() || !data->IsMap() || async_local_storage_local.IsEmpty()) {
return "";
}
auto map = data.As<v8::Map>();
auto context = isolate->GetCurrentContext();
auto maybe_root_store = map->Get(context, async_local_storage_local);
if (maybe_root_store.IsEmpty()) {
return "";
}
auto root_store = maybe_root_store.ToLocalChecked();
if (store.storage_keys.has_value()) {
// Walk the keys to get the desired nested value
const auto &keys = store.storage_keys.value();
auto current = root_store;
for (auto &gkey : keys) {
auto local_key = gkey.Get(isolate);
if (!(local_key->IsString() || local_key->IsSymbol())) {
continue;
}
v8::MaybeLocal<v8::Value> maybeValue;
if (current->IsMap()) {
auto map_val = current.As<v8::Map>();
maybeValue = map_val->Get(context, local_key);
} else if (current->IsObject()) {
auto obj_val = current.As<v8::Object>();
maybeValue = obj_val->Get(context, local_key);
} else {
return "";
}
if (maybeValue.IsEmpty()) {
return "";
}
current = maybeValue.ToLocalChecked();
}
root_store = current;
}
return JSONStringify(isolate, root_store);
}
#endif
struct InterruptArgs {
std::promise<JsStackTrace> promise;
const std::optional<AsyncLocalStorageLookup> *store;
};
// Function to be called when an isolate's execution is interrupted
static void ExecutionInterrupted(Isolate *isolate, void *data) {
auto args = static_cast<InterruptArgs *>(data);
Locker locker(isolate);
HandleScope handle_scope(isolate);
if (isolate->IsExecutionTerminating()) {
args->promise.set_value({{}, ""});
delete args;
return;
}
auto frames = GetStackFrames(isolate);
std::string state = "";
#if SUPPORTS_ASYNC_CONTEXT_FRAME
if (args->store && args->store->has_value()) {
state = GetThreadState(isolate, args->store->value());
}
#endif
args->promise.set_value({frames, state});
delete args;
}
// Function to capture the stack trace of a single isolate
JsStackTrace
CaptureStackTrace(Isolate *isolate,
const std::optional<AsyncLocalStorageLookup> &store) {
if (isolate->IsExecutionTerminating()) {
return JsStackTrace{{}, ""};
}
std::promise<JsStackTrace> promise;
auto future = promise.get_future();
// The v8 isolate must be interrupted to capture the stack trace
isolate->RequestInterrupt(ExecutionInterrupted,
new InterruptArgs{std::move(promise), &store});
return future.get();
}
// Function to capture stack traces from all registered threads
void CaptureStackTraces(const FunctionCallbackInfo<Value> &args) {
auto capture_from_isolate = args.GetIsolate();
std::vector<ThreadResult> results;
{
std::vector<std::future<ThreadResult>> futures;
std::lock_guard<std::mutex> lock(threads_mutex);
for (auto &thread : threads) {
auto thread_isolate = thread.first;
auto &thread_info = thread.second;
if (thread_isolate == capture_from_isolate)
continue;
auto thread_name = thread_info.thread_name;
auto poll_state = thread_info.poll_state;
futures.emplace_back(std::async(
std::launch::async,
[thread_isolate, thread_name, poll_state](
const std::optional<AsyncLocalStorageLookup> &async_store)
-> ThreadResult {
return ThreadResult{thread_name,
CaptureStackTrace(thread_isolate, async_store),
poll_state};
},
std::cref(thread_info.async_store)));
}
for (auto &fut : futures) {
results.emplace_back(fut.get());
}
}
auto current_context = capture_from_isolate->GetCurrentContext();
Local<Object> output = Object::New(capture_from_isolate);
for (auto &result : results) {
auto key =
String::NewFromUtf8(capt
4D32
ure_from_isolate, result.thread_name.c_str(),
NewStringType::kNormal)
.ToLocalChecked();
Local<Array> jsFrames =
Array::New(capture_from_isolate, result.stack_trace.frames.size());
for (size_t i = 0; i < result.stack_trace.frames.size(); ++i) {
const auto &frame = result.stack_trace.frames[i];
Local<Object> frameObj = Object::New(capture_from_isolate);
frameObj
->Set(current_context,
String::NewFromUtf8(capture_from_isolate, "function",
NewStringType::kInternalized)
.ToLocalChecked(),
String::NewFromUtf8(capture_from_isolate,
frame.function_name.c_str(),
NewStringType::kNormal)
.ToLocalChecked())
.Check();
frameObj
->Set(current_context,
String::NewFromUtf8(capture_from_isolate, "filename",
NewStringType::kInternalized)
.ToLocalChecked(),
String::NewFromUtf8(capture_from_isolate,
frame.filename.c_str(),
NewStringType::kNormal)
.ToLocalChecked())
.Check();
frameObj
->Set(current_context,
String::NewFromUtf8(capture_from_isolate, "lineno",
NewStringType::kInternalized)
.ToLocalChecked(),
Integer::New(capture_from_isolate, frame.lineno))
.Check();
frameObj
->Set(current_context,
String::NewFromUtf8(capture_from_isolate, "colno",
NewStringType::kInternalized)
.ToLocalChecked(),
Integer::New(capture_from_isolate, frame.colno))
.Check();
jsFrames->Set(current_context, static_cast<uint32_t>(i), frameObj)
.Check();
}
// Create a thread object with a 'frames' property and optional 'state'
Local<Object> threadObj = Object::New(capture_from_isolate);
threadObj
->Set(current_context,
String::NewFromUtf8(capture_from_isolate, "frames",
NewStringType::kInternalized)
.ToLocalChecked(),
jsFrames)
.Check();
if (!result.poll_state.empty()) {
v8::MaybeLocal<v8::String> stateStr = v8::String::NewFromUtf8(
capture_from_isolate, result.poll_state.c_str(),
NewStringType::kNormal);
if (!stateStr.IsEmpty()) {
v8::MaybeLocal<v8::Value> maybeStateVal =
v8::JSON::Parse(current_context, stateStr.ToLocalChecked());
v8::Local<v8::Value> stateVal;
if (maybeStateVal.ToLocal(&stateVal)) {
threadObj
->Set(current_context,
String::NewFromUtf8(capture_from_isolate, "pollState",
NewStringType::kInternalized)
.ToLocalChecked(),
stateVal)
.Check();
}
}
}
if (!result.stack_trace.async_state.empty()) {
v8::MaybeLocal<v8::String> stateStr = v8::String::NewFromUtf8(
capture_from_isolate, result.stack_trace.async_state.c_str(),
NewStringType::kNormal);
if (!stateStr.IsEmpty()) {
v8::MaybeLocal<v8::Value> maybeStateVal =
v8::JSON::Parse(current_context, stateStr.ToLocalChecked());
v8::Local<v8::Value> stateVal;
if (maybeStateVal.ToLocal(&stateVal)) {
threadObj
->Set(current_context,
String::NewFromUtf8(capture_from_isolate, "asyncState",
NewStringType::kInternalized)
.ToLocalChecked(),
stateVal)
.Check();
}
}
}
output->Set(current_context, key, threadObj).Check();
}
args.GetReturnValue().Set(output);
}
// Cleanup function to remove the thread from the map when the isolate is
// destroyed
void Cleanup(void *arg) {
auto isolate = static_cast<Isolate *>(arg);
std::lock_guard<std::mutex> lock(threads_mutex);
threads.erase(isolate);
}
void RegisterThreadInternal(
Isolate *isolate, const std::string &thread_name,
std::optional<AsyncLocalStorageLookup> async_store) {
std::lock_guard<std::mutex> lock(threads_mutex);
auto found = threads.find(isolate);
if (found == threads.end()) {
threads.emplace(isolate, ThreadInfo{thread_name, milliseconds::zero(),
std::move(async_store), ""});
// Register a cleanup hook to remove this thread when the isolate is
// destroyed
node::AddEnvironmentCleanupHook(isolate, Cleanup, isolate);
}
}
// Function to register a thread and update its last seen time
void RegisterThread(const FunctionCallbackInfo<Value> &args) {
auto isolate = args.GetIsolate();
auto context = isolate->GetCurrentContext();
if (args.Length() == 1 && args[0]->IsString()) {
v8::String::Utf8Value utf8(isolate, args[0]);
std::string thread_name(*utf8 ? *utf8 : "");
RegisterThreadInternal(isolate, thread_name, std::nullopt);
} else if (args.Length() == 2 && args[0]->IsObject() && args[1]->IsString()) {
v8::String::Utf8Value utf8(isolate, args[1]);
std::string thread_name(*utf8 ? *utf8 : "");
auto obj = args[0].As<Object>();
auto async_local_storage_val =
obj->Get(context, String::NewFromUtf8(isolate, "asyncLocalStorage",
NewStringType::kInternalized)
.ToLocalChecked());
if (async_local_storage_val.IsEmpty() ||
!async_local_storage_val.ToLocalChecked()->IsObject()) {
isolate->ThrowException(Exception::Error(
String::NewFromUtf8(isolate,
"The first argument must be an object with an "
"asyncLocalStorage property",
NewStringType::kInternalized)
.ToLocalChecked()));
return;
}
std::optional<std::vector<v8::Global<v8::Value>>> storage_keys =
std::nullopt;
auto storage_key_val =
obj->Get(context, String::NewFromUtf8(isolate, "stateLookup",
NewStringType::kInternalized)
.ToLocalChecked());
if (!storage_key_val.IsEmpty()) {
auto local_val = storage_key_val.ToLocalChecked();
if (!local_val->IsUndefined() && !local_val->IsNull()) {
if (local_val->IsArray()) {
auto arr = local_val.As<v8::Array>();
std::vector<v8::Global<v8::Value>> keys_vec;
uint32_t length = arr->Length();
for (uint32_t i = 0; i < length; ++i) {
auto maybeEl = arr->Get(context, i);
if (maybeEl.IsEmpty())
continue;
auto el = maybeEl.ToLocalChecked();
if (el->IsString() || el->IsSymbol()) {
keys_vec.emplace_back(isolate, el);
}
}
if (!keys_vec.empty()) {
storage_keys = std::move(keys_vec);
}
}
}
}
auto store = AsyncLocalStorageLookup{
v8::Global<v8::Value>(isolate,
async_local_storage_val.ToLocalChecked()),
std::move(storage_keys)};
RegisterThreadInternal(isolate, thread_name, std::move(store));
} else {
isolate->ThrowException(Exception::Error(
String::NewFromUtf8(
isolate,
"Incorrect arguments. Expected: \n"
"- registerThread(threadName: string) or \n"
"- registerThread(storage: {asyncLocalStorage: AsyncLocalStorage; "
"stateLookup?: Array<string | symbol>}, "
"threadName: string)",
NewStringType::kInternalized)
.ToLocalChecked()));
}
}
// Cross-platform monotonic time function. Provides a monotonic clock that only
// increases and does not tick when the system is suspended.
steady_clock::time_point GetUnbiasedMonotonicTime() {
#ifdef _WIN32
// Windows: QueryUnbiasedInterruptTimePrecise returns time in 100-nanosecond
// units
ULONGLONG interrupt_time;
QueryUnbiasedInterruptTimePrecise(&interrupt_time);
// Convert from 100-nanosecond units to nanoseconds
uint64_t time_ns = interrupt_time * 100;
return steady_clock::time_point(nanoseconds(time_ns));
#elif defined(__APPLE__)
uint64_t time_ns = clock_gettime_nsec_np(CLOCK_UPTIME_RAW);
return steady_clock::time_point(nanoseconds(time_ns));
#elif defined(__linux__)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return steady_clock::time_point(seconds(ts.tv_sec) + nanoseconds(ts.tv_nsec));
#else
// Fallback for other platforms using steady_clock. Note: this will be
// monotonic but is not guaranteed to ignore time spent while suspended.
return steady_clock::now();
#endif
}
// Function to track a thread and set its state
void ThreadPoll(const FunctionCallbackInfo<Value> &args) {
auto isolate = args.GetIsolate();
bool enable_last_seen = true;
if (args.Length() > 0 && args[0]->IsBoolean()) {
enable_last_seen = args[0]->BooleanValue(isolate);
}
std::string poll_state = "";
if (args.Length() > 1 && args[1]->IsObject()) {
auto obj = args[1].As<Object>();
poll_state = JSONStringify(isolate, obj);
}
{
std::lock_guard<std::mutex> lock(threads_mutex);
auto found = threads.find(isolate);
if (found != threads.end()) {
auto &thread_info = found->second;
thread_info.poll_state = std::move(poll_state);
if (enable_last_seen) {
thread_info.last_seen = duration_cast<milliseconds>(
GetUnbiasedMonotonicTime().time_since_epoch());
} else {
thread_info.last_seen = milliseconds::zero();
}
}
}
}
// Function to get the last seen time of all registered threads
void GetThreadsLastSeen(const FunctionCallbackInfo<Value> &args) {
Isolate *isolate = args.GetIsolate();
Local<Object> result = Object::New(isolate);
milliseconds now = duration_cast<milliseconds>(
GetUnbiasedMonotonicTime().time_since_epoch());
{
std::lock_guard<std::mutex> lock(threads_mutex);
for (const auto &[thread_isolate, info] : threads) {
if (info.last_seen == milliseconds::zero())
continue; // Skip threads that have not registered more than once
int64_t ms_since = (now - info.last_seen).count();
result
->Set(isolate->GetCurrentContext(),
String::NewFromUtf8(isolate, info.thread_name.c_str(),
NewStringType::kNormal)
.ToLocalChecked(),
Number::New(isolate, ms_since))
.Check();
}
}
args.GetReturnValue().Set(result);
}
extern "C" NODE_MODULE_EXPORT void
NODE_MODULE_INITIALIZER(Local<Object> exports, Local<Value> module,
Local<Context> context) {
auto isolate = v8::Isolate::GetCurrent();
exports
->Set(context,
String::NewFromUtf8(isolate, "captureStackTrace",
NewStringType::kInternalized)
.ToLocalChecked(),
FunctionTemplate::New(isolate, CaptureStackTraces)
->GetFunction(context)
.ToLocalChecked())
.Check();
exports
->Set(context,
String::NewFromUtf8(isolate, "registerThread",
NewStringType::kInternalized)
.ToLocalChecked(),
FunctionTemplate::New(isolate, RegisterThread)
->GetFunction(context)
.ToLocalChecked())
.Check();
exports
->Set(context,
String::NewFromUtf8(isolate, "threadPoll",
NewStringType::kInternalized)
.ToLocalChecked(),
FunctionTemplate::New(isolate, ThreadPoll)
->GetFunction(context)
.ToLocalChecked())
.Check();
exports
->Set(context,
String::NewFromUtf8(isolate, "getThreadsLastSeen",
NewStringType::kInternalized)
.ToLocalChecked(),
FunctionTemplate::New(isolate, GetThreadsLastSeen)
->GetFunction(context)
.ToLocalChecked())
.Check();
}