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const {
ArrayPrototypeSlice,
ErrorCaptureStackTrace,
ObjectPrototypeHasOwnProperty,
ObjectDefineProperty,
Symbol,
} = primordials;
const promiseHooks = require('internal/promise_hooks');
const async_wrap = internalBinding('async_wrap');
const { setCallbackTrampoline } = async_wrap;
/* async_hook_fields is a Uint32Array wrapping the uint32_t array of
* Environment::AsyncHooks::fields_[]. Each index tracks the number of active
* hooks for each type.
*
* async_id_fields is a Float64Array wrapping the double array of
* Environment::AsyncHooks::async_id_fields_[]. Each index contains the ids for
* the various asynchronous states of the application. These are:
* kExecutionAsyncId: The async_id assigned to the resource responsible for the
* current execution stack.
* kTriggerAsyncId: The async_id of the resource that caused (or 'triggered')
* the resource corresponding to the current execution stack.
* kAsyncIdCounter: Incremental counter tracking the next assigned async_id.
* kDefaultTriggerAsyncId: Written immediately before a resource's constructor
* that sets the value of the init()'s triggerAsyncId. The precedence order
* of retrieving the triggerAsyncId value is:
* 1. the value passed directly to the constructor
* 2. value set in kDefaultTriggerAsyncId
* 3. executionAsyncId of the current resource.
*
* async_ids_stack is a Float64Array that contains part of the async ID
* stack. Each pushAsyncContext() call adds two doubles to it, and each
* popAsyncContext() call removes two doubles from it.
* It has a fixed size, so if that is exceeded, calls to the native
* side are used instead in pushAsyncContext() and popAsyncContext().
*/
const {
async_hook_fields,
async_id_fields,
execution_async_resources
} = async_wrap;
// Store the pair executionAsyncId and triggerAsyncId in a AliasedFloat64Array
// in Environment::AsyncHooks::async_ids_stack_ which tracks the resource
// responsible for the current execution stack. This is unwound as each resource
// exits. In the case of a fatal exception this stack is emptied after calling
// each hook's after() callback.
const {
pushAsyncContext: pushAsyncContext_,
popAsyncContext: popAsyncContext_,
executionAsyncResource: executionAsyncResource_,
clearAsyncIdStack,
} = async_wrap;
// Properties in active_hooks are used to keep track of the set of hooks being
// executed in case another hook is enabled/disabled. The new set of hooks is
// then restored once the active set of hooks is finished executing.
const active_hooks = {
// Array of all AsyncHooks that will be iterated whenever an async event
// fires. Using var instead of (preferably const) in order to assign
// active_hooks.tmp_array if a hook is enabled/disabled during hook
// execution.
array: [],
// Use a counter to track nested calls of async hook callbacks and make sure
// the active_hooks.array isn't altered mid execution.
call_depth: 0,
// Use to temporarily store and updated active_hooks.array if the user
// enables or disables a hook while hooks are being processed. If a hook is
// enabled() or disabled() during hook execution then the current set of
// active hooks is duplicated and set equal to active_hooks.tmp_array. Any
// subsequent changes are on the duplicated array. When all hooks have
// completed executing active_hooks.tmp_array is assigned to
// active_hooks.array.
tmp_array: null,
// Keep track of the field counts held in active_hooks.tmp_array. Because the
// async_hook_fields can't be reassigned, store each uint32 in an array that
// is written back to async_hook_fields when active_hooks.array is restored.
tmp_fields: null
};
const { registerDestroyHook } = async_wrap;
const { enqueueMicrotask } = internalBinding('task_queue');
const { resource_symbol, owner_symbol } = internalBinding('symbols');
// Each constant tracks how many callbacks there are for any given step of
// async execution. These are tracked so if the user didn't include callbacks
// for a given step, that step can bail out early.
const {
kInit, kBefore, kAfter, kDestroy, kTotals, kPromiseResolve,
kCheck, kExecutionAsyncId, kAsyncIdCounter, kTriggerAsyncId,
kDefaultTriggerAsyncId, kStackLength, kUsesExecutionAsyncResource,
} = async_wrap.constants;
const { async_id_symbol,
trigger_async_id_symbol } = internalBinding('symbols');
// Lazy load of internal/util/inspect;
let inspect;
// Used in AsyncHook and AsyncResource.
const init_symbol = Symbol('init');
const before_symbol = Symbol('before');
const after_symbol = Symbol('after');
const destroy_symbol = Symbol('destroy');
const promise_resolve_symbol = Symbol('promiseResolve');
const emitBeforeNative = emitHookFactory(before_symbol, 'emitBeforeNative');
const emitAfterNative = emitHookFactory(after_symbol, 'emitAfterNative');
const emitDestroyNative = emitHookFactory(destroy_symbol, 'emitDestroyNative');
const emitPromiseResolveNative =
emitHookFactory(promise_resolve_symbol, 'emitPromiseResolveNative');
let domain_cb;
function useDomainTrampoline(fn) {
domain_cb = fn;
}
function callbackTrampoline(asyncId, resource, cb, ...args) {
const index = async_hook_fields[kStackLength] - 1;
execution_async_resources[index] = resource;
if (asyncId !== 0 && hasHooks(kBefore))
emitBeforeNative(asyncId);
let result;
if (asyncId === 0 && typeof domain_cb === 'function') {
args.unshift(cb);
result = domain_cb.apply(this, args);
} else {
result = cb.apply(this, args);
}
if (asyncId !== 0 && hasHooks(kAfter))
emitAfterNative(asyncId);
execution_async_resources.pop();
return result;
}
const topLevelResource = {};
function executionAsyncResource() {
// Indicate to the native layer that this function is likely to be used,
// in which case it will inform JS about the current async resource via
// the trampoline above.
async_hook_fields[kUsesExecutionAsyncResource] = 1;
const index = async_hook_fields[kStackLength] - 1;
if (index === -1) return topLevelResource;
const resource = execution_async_resources[index] ||
executionAsyncResource_(index);
return lookupPublicResource(resource);
}
function inspectExceptionValue(e) {
inspect ??= require('internal/util/inspect').inspect;
return { message: inspect(e) };
}
// Used to fatally abort the process if a callback throws.
function fatalError(e) {
if (typeof e?.stack === 'string') {
process._rawDebug(e.stack);
} else {
const o = inspectExceptionValue(e);
ErrorCaptureStackTrace(o, fatalError);
process._rawDebug(o.stack);
}
const { getOptionValue } = require('internal/options');
if (getOptionValue('--abort-on-uncaught-exception')) {
process.abort();
}
process.exit(1);
}
function lookupPublicResource(resource) {
if (typeof resource !== 'object' || resource === null) return resource;
// TODO(addaleax): Merge this with owner_symbol and use it across all
// AsyncWrap instances.
const publicResource = resource[resource_symbol];
if (publicResource !== undefined)
return publicResource;
return resource;
}
// Emit From Native //
// Used by C++ to call all init() callbacks. Because some state can be setup
// from C++ there's no need to perform all the same operations as in
// emitInitScript.
function emitInitNative(asyncId, type, triggerAsyncId, resource) {
active_hooks.call_depth += 1;
resource = lookupPublicResource(resource);
// Use a single try/catch for all hooks to avoid setting up one per iteration.
try {
// Using var here instead of let because "for (var ...)" is faster than let.
// Refs: https://github.com/nodejs/node/pull/30380#issuecomment-552948364
// eslint-disable-next-line no-var
for (var i = 0; i < active_hooks.array.length; i++) {
if (typeof active_hooks.array[i][init_symbol] === 'function') {
active_hooks.array[i][init_symbol](
asyncId, type, triggerAsyncId,
resource
);
}
}
} catch (e) {
fatalError(e);
} finally {
active_hooks.call_depth -= 1;
}
// Hooks can only be restored if there have been no recursive hook calls.
// Also the active hooks do not need to be restored if enable()/disable()
// weren't called during hook execution, in which case active_hooks.tmp_array
// will be null.
if (active_hooks.call_depth === 0 && active_hooks.tmp_array !== null) {
restoreActiveHooks();
}
}
// Called from native. The asyncId stack handling is taken care of there
// before this is called.
function emitHook(symbol, asyncId) {
active_hooks.call_depth += 1;
// Use a single try/catch for all hook to avoid setting up one per
// iteration.
try {
// Using var here instead of let because "for (var ...)" is faster than let.
// Refs: https://github.com/nodejs/node/pull/30380#issuecomment-552948364
// eslint-disable-next-line no-var
for (var i = 0; i < active_hooks.array.length; i++) {
if (typeof active_hooks.array[i][symbol] === 'function') {
active_hooks.array[i][symbol](asyncId);
}
}
} catch (e) {
fatalError(e);
} finally {
active_hooks.call_depth -= 1;
}
// Hooks can only be restored if there have been no recursive hook calls.
// Also the active hooks do not need to be restored if enable()/disable()
// weren't called during hook execution, in which case
// active_hooks.tmp_array will be null.
if (active_hooks.call_depth === 0 && active_hooks.tmp_array !== null) {
restoreActiveHooks();
}
}
function emitHookFactory(symbol, name) {
const fn = emitHook.bind(undefined, symbol);
// Set the name property of the function as it looks good in the stack trace.
ObjectDefineProperty(fn, 'name', {
__proto__: null,
value: name
});
return fn;
}
// Manage Active Hooks //
function getHookArrays() {
if (active_hooks.call_depth === 0)
return [active_hooks.array, async_hook_fields];
// If this hook is being enabled while in the middle of processing the array
// of currently active hooks then duplicate the current set of active hooks
// and store this there. This shouldn't fire until the next time hooks are
// processed.
if (active_hooks.tmp_array === null)
storeActiveHooks();
return [active_hooks.tmp_array, active_hooks.tmp_fields];
}
function storeActiveHooks() {
active_hooks.tmp_array = ArrayPrototypeSlice(active_hooks.array);
// Don't want to make the assumption that kInit to kDestroy are indexes 0 to
// 4. So do this the long way.
active_hooks.tmp_fields = [];
copyHooks(active_hooks.tmp_fields, async_hook_fields);
}
function copyHooks(destination, source) {
destination[kInit] = source[kInit];
destination[kBefore] = source[kBefore];
destination[kAfter] = source[kAfter];
destination[kDestroy] = source[kDestroy];
destination[kPromiseResolve] = source[kPromiseResolve];
}
// Then restore the correct hooks array in case any hooks were added/removed
// during hook callback execution.
function restoreActiveHooks() {
active_hooks.array = active_hooks.tmp_array;
copyHooks(async_hook_fields, active_hooks.tmp_fields);
active_hooks.tmp_array = null;
active_hooks.tmp_fields = null;
}
function trackPromise(promise, parent) {
if (promise[async_id_symbol]) {
return;
}
// Get trigger id from parent async id before making the async id of the
// child so if a new one must be made it will be lower than the child.
const triggerAsyncId = parent ? getOrSetAsyncId(parent) :
getDefaultTriggerAsyncId();
promise[async_id_symbol] = newAsyncId();
promise[trigger_async_id_symbol] = triggerAsyncId;
}
function promiseInitHook(promise, parent) {
trackPromise(promise, parent);
const asyncId = promise[async_id_symbol];
const triggerAsyncId = promise[trigger_async_id_symbol];
emitInitScript(asyncId, 'PROMISE', triggerAsyncId, promise);
}
function promiseInitHookWithDestroyTracking(promise, parent) {
promiseInitHook(promise, parent);
destroyTracking(promise, parent);
}
function destroyTracking(promise, parent) {
trackPromise(promise, parent);
const asyncId = promise[async_id_symbol];
registerDestroyHook(promise, asyncId);
}
function promiseBeforeHook(promise) {
trackPromise(promise);
const asyncId = promise[async_id_symbol];
const triggerId = promise[trigger_async_id_symbol];
emitBeforeScript(asyncId, triggerId, promise);
}
function promiseAfterHook(promise) {
trackPromise(promise);
const asyncId = promise[async_id_symbol];
if (hasHooks(kAfter)) {
emitAfterNative(asyncId);
}
if (asyncId === executionAsyncId()) {
// This condition might not be true if async_hooks was enabled during
// the promise callback execution.
// Popping it off the stack can be skipped in that case, because it is
// known that it would correspond to exactly one call with
// PromiseHookType::kBefore that was not witnessed by the PromiseHook.
popAsyncContext(asyncId);
}
}
function promiseResolveHook(promise) {
trackPromise(promise);
const asyncId = promise[async_id_symbol];
emitPromiseResolveNative(asyncId);
}
let wantPromiseHook = false;
function enableHooks() {
async_hook_fields[kCheck] += 1;
setCallbackTrampoline(callbackTrampoline);
}
let stopPromiseHook;
function updatePromiseHookMode() {
wantPromiseHook = true;
let initHook;
if (initHooksExist()) {
initHook = destroyHooksExist() ? promiseInitHookWithDestroyTracking :
promiseInitHook;
} else if (destroyHooksExist()) {
initHook = destroyTracking;
}
if (stopPromiseHook) stopPromiseHook();
stopPromiseHook = promiseHooks.createHook({
init: initHook,
before: promiseBeforeHook,
after: promiseAfterHook,
settled: promiseResolveHooksExist() ? promiseResolveHook : undefined
});
}
function disableHooks() {
async_hook_fields[kCheck] -= 1;
wantPromiseHook = false;
setCallbackTrampoline();
// Delay the call to `disablePromiseHook()` because we might currently be
// between the `before` and `after` calls of a Promise.
enqueueMicrotask(disablePromiseHookIfNecessary);
}
function disablePromiseHookIfNecessary() {
if (!wantPromiseHook && stopPromiseHook) {
stopPromiseHook();
}
}
// Internal Embedder API //
// Increment the internal id counter and return the value. Important that the
// counter increment first. Since it's done the same way in
// Environment::new_async_uid()
function newAsyncId() {
return ++async_id_fields[kAsyncIdCounter];
}
function getOrSetAsyncId(object) {
if (ObjectPrototypeHasOwnProperty(object, async_id_symbol)) {
return object[async_id_symbol];
}
return object[async_id_symbol] = newAsyncId();
}
// Return the triggerAsyncId meant for the constructor calling it. It's up to
// the user to safeguard this call and make sure it's zero'd out when the
// constructor is complete.
function getDefaultTriggerAsyncId() {
const defaultTriggerAsyncId = async_id_fields[kDefaultTriggerAsyncId];
// If defaultTriggerAsyncId isn't set, use the executionAsyncId
if (defaultTriggerAsyncId < 0)
return async_id_fields[kExecutionAsyncId];
return defaultTriggerAsyncId;
}
function clearDefaultTriggerAsyncId() {
async_id_fields[kDefaultTriggerAsyncId] = -1;
}
/**
* Sets a default top level trigger ID to be used
*
* @template {Array<unknown>} T
* @template {unknown} R
* @param {number} triggerAsyncId
* @param { (...T: args) => R } block
* @param {T} args
* @returns {R}
*/
function defaultTriggerAsyncIdScope(triggerAsyncId, block, ...args) {
if (triggerAsyncId === undefined)
return block.apply(null, args);
// CHECK(NumberIsSafeInteger(triggerAsyncId))
// CHECK(triggerAsyncId > 0)
const oldDefaultTriggerAsyncId = async_id_fields[kDefaultTriggerAsyncId];
async_id_fields[kDefaultTriggerAsyncId] = triggerAsyncId;
try {
return block.apply(null, args);
} finally {
async_id_fields[kDefaultTriggerAsyncId] = oldDefaultTriggerAsyncId;
}
}
function hasHooks(key) {
return async_hook_fields[key] > 0;
}
function enabledHooksExist() {
return hasHooks(kCheck);
}
function initHooksExist() {
return hasHooks(kInit);
}
function afterHooksExist() {
return hasHooks(kAfter);
}
function destroyHooksExist() {
return hasHooks(kDestroy);
}
function promiseResolveHooksExist() {
return hasHooks(kPromiseResolve);
}
function emitInitScript(asyncId, type, triggerAsyncId, resource) {
// Short circuit all checks for the common case. Which is that no hooks have
// been set. Do this to remove performance impact for embedders (and core).
if (!hasHooks(kInit))
return;
if (triggerAsyncId === null) {
triggerAsyncId = getDefaultTriggerAsyncId();
}
emitInitNative(asyncId, type, triggerAsyncId, resource);
}
function emitBeforeScript(asyncId, triggerAsyncId, resource) {
pushAsyncContext(asyncId, triggerAsyncId, resource);
if (hasHooks(kBefore))
emitBeforeNative(asyncId);
}
function emitAfterScript(asyncId) {
if (hasHooks(kAfter))
emitAfterNative(asyncId);
popAsyncContext(asyncId);
}
function emitDestroyScript(asyncId) {
// Return early if there are no destroy callbacks, or invalid asyncId.
if (!hasHooks(kDestroy) || asyncId <= 0)
return;
async_wrap.queueDestroyAsyncId(asyncId);
}
function hasAsyncIdStack() {
return hasHooks(kStackLength);
}
// This is the equivalent of the native push_async_ids() call.
function pushAsyncContext(asyncId, triggerAsyncId, resource) {
const offset = async_hook_fields[kStackLength];
execution_async_resources[offset] = resource;
if (offset * 2 >= async_wrap.async_ids_stack.length)
return pushAsyncContext_(asyncId, triggerAsyncId);
async_wrap.async_ids_stack[offset * 2] = async_id_fields[kExecutionAsyncId];
async_wrap.async_ids_stack[offset * 2 + 1] = async_id_fields[kTriggerAsyncId];
async_hook_fields[kStackLength]++;
async_id_fields[kExecutionAsyncId] = asyncId;
async_id_fields[kTriggerAsyncId] = triggerAsyncId;
}
// This is the equivalent of the native pop_async_ids() call.
function popAsyncContext(asyncId) {
const stackLength = async_hook_fields[kStackLength];
if (stackLength === 0) return false;
if (enabledHooksExist() && async_id_fields[kExecutionAsyncId] !== asyncId) {
// Do the same thing as the native code (i.e. crash hard).
return popAsyncContext_(asyncId);
}
const offset = stackLength - 1;
async_id_fields[kExecutionAsyncId] = async_wrap.async_ids_stack[2 * offset];
async_id_fields[kTriggerAsyncId] = async_wrap.async_ids_stack[2 * offset + 1];
execution_async_resources.pop();
async_hook_fields[kStackLength] = offset;
return offset > 0;
}
function executionAsyncId() {
return async_id_fields[kExecutionAsyncId];
}
function triggerAsyncId() {
return async_id_fields[kTriggerAsyncId];
}
module.exports = {
executionAsyncId,
triggerAsyncId,
// Private API
getHookArrays,
symbols: {
async_id_symbol, trigger_async_id_symbol,
init_symbol, before_symbol, after_symbol, destroy_symbol,
promise_resolve_symbol, owner_symbol
},
constants: {
kInit, kBefore, kAfter, kDestroy, kTotals, kPromiseResolve
},
enableHooks,
disableHooks,
updatePromiseHookMode,
clearDefaultTriggerAsyncId,
clearAsyncIdStack,
hasAsyncIdStack,
executionAsyncResource,
// Internal Embedder API
newAsyncId,
getOrSetAsyncId,
getDefaultTriggerAsyncId,
defaultTriggerAsyncIdScope,
enabledHooksExist,
initHooksExist,
afterHooksExist,
destroyHooksExist,
emitInit: emitInitScript,
emitBefore: emitBeforeScript,
emitAfter: emitAfterScript,
emitDestroy: emitDestroyScript,
pushAsyncContext,
popAsyncContext,
registerDestroyHook,
useDomainTrampoline,
nativeHooks: {
init: emitInitNative,
before: emitBeforeNative,
after: emitAfterNative,
destroy: emitDestroyNative,
promise_resolve: emitPromiseResolveNative
},
asyncWrap: {
Providers: async_wrap.Providers,
}
};
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