async_hooks,process: remove internalNextTick

Instead of having mostly duplicate code in form of internalNextTick,
instead use the existing defaultAsyncTriggerIdScope with a slight
modification which allows undefined triggerAsyncId to be passed in,
which then just triggers the callback with the provided arguments.

PR-URL: nodejs#19147
Refs: nodejs#19104
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/_http_agent.js

@@ -26,7 +26,6 @@ const util = require('util');
 const EventEmitter = require('events');
 const debug = util.debuglog('http');
 const { async_id_symbol } = require('internal/async_hooks').symbols;
-const { nextTick } = require('internal/process/next_tick');
 
 // New Agent code.
 
@@ -342,10 +341,7 @@ Agent.prototype.destroy = function destroy() {
 function handleSocketCreation(request, informRequest) {
   return function handleSocketCreation_Inner(err, socket) {
     if (err) {
-      const asyncId = (socket && socket._handle && socket._handle.getAsyncId) ?
-        socket._handle.getAsyncId() :
-        null;
-      nextTick(asyncId, () => request.emit('error', err));
+      process.nextTick(emitErrorNT, request, err);
       return;
     }
     if (informRequest)
@@ -355,6 +351,10 @@ function handleSocketCreation(request, informRequest) {
   };
 }
 
+function emitErrorNT(emitter, err) {
+  emitter.emit('error', err);
+}
+
 module.exports = {
   Agent,
   globalAgent: new Agent()

lib/_http_client.js

@@ -36,9 +36,9 @@ const {
 const { OutgoingMessage } = require('_http_outgoing');
 const Agent = require('_http_agent');
 const { Buffer } = require('buffer');
+const { defaultTriggerAsyncIdScope } = require('internal/async_hooks');
 const { urlToOptions, searchParamsSymbol } = require('internal/url');
 const { outHeadersKey, ondrain } = require('internal/http');
-const { nextTick } = require('internal/process/next_tick');
 const {
   ERR_HTTP_HEADERS_SENT,
   ERR_INVALID_ARG_TYPE,
@@ -563,10 +563,10 @@ function responseKeepAlive(res, req) {
     socket.once('error', freeSocketErrorListener);
     // There are cases where _handle === null. Avoid those. Passing null to
     // nextTick() will call getDefaultTriggerAsyncId() to retrieve the id.
-    const asyncId = socket._handle ? socket._handle.getAsyncId() : null;
+    const asyncId = socket._handle ? socket._handle.getAsyncId() : undefined;
     // Mark this socket as available, AFTER user-added end
     // handlers have a chance to run.
-    nextTick(asyncId, emitFreeNT, socket);
+    defaultTriggerAsyncIdScope(asyncId, process.nextTick, emitFreeNT, socket);
   }
 }
 

lib/_http_outgoing.js

@@ -31,8 +31,10 @@ const common = require('_http_common');
 const checkIsHttpToken = common._checkIsHttpToken;
 const checkInvalidHeaderChar = common._checkInvalidHeaderChar;
 const { outHeadersKey } = require('internal/http');
-const { async_id_symbol } = require('internal/async_hooks').symbols;
-const { nextTick } = require('internal/process/next_tick');
+const {
+  defaultTriggerAsyncIdScope,
+  symbols: { async_id_symbol }
+} = require('internal/async_hooks');
 const {
   ERR_HTTP_HEADERS_SENT,
   ERR_HTTP_INVALID_HEADER_VALUE,
@@ -272,15 +274,14 @@ function _writeRaw(data, encoding, callback) {
       this._flushOutput(conn);
     } else if (!data.length) {
       if (typeof callback === 'function') {
-        let socketAsyncId = this.socket[async_id_symbol];
         // If the socket was set directly it won't be correctly initialized
         // with an async_id_symbol.
         // TODO(AndreasMadsen): @trevnorris suggested some more correct
         // solutions in:
         // https://github.com/nodejs/node/pull/14389/files#r128522202
-        if (socketAsyncId === undefined) socketAsyncId = null;
-
-        nextTick(socketAsyncId, callback);
+        defaultTriggerAsyncIdScope(conn[async_id_symbol],
+                                   process.nextTick,
+                                   callback);
       }
       return true;
     }
@@ -633,10 +634,13 @@ OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
 function write_(msg, chunk, encoding, callback, fromEnd) {
   if (msg.finished) {
     const err = new ERR_STREAM_WRITE_AFTER_END();
-    nextTick(msg.socket && msg.socket[async_id_symbol],
-             writeAfterEndNT.bind(msg),
-             err,
-             callback);
+    const triggerAsyncId = msg.socket ? msg.socket[async_id_symbol] : undefined;
+    defaultTriggerAsyncIdScope(triggerAsyncId,
+                               process.nextTick,
+                               writeAfterEndNT,
+                               msg,
+                               err,
+                               callback);
 
     return true;
   }
@@ -686,8 +690,8 @@ function write_(msg, chunk, encoding, callback, fromEnd) {
 }
 
 
-function writeAfterEndNT(err, callback) {
-  this.emit('error', err);
+function writeAfterEndNT(msg, err, callback) {
+  msg.emit('error', err);
   if (callback) callback(err);
 }
 

lib/dgram.js

@@ -44,7 +44,6 @@ const {
   symbols: { async_id_symbol }
 } = require('internal/async_hooks');
 const { UV_UDP_REUSEADDR } = process.binding('constants').os;
-const { nextTick } = require('internal/process/next_tick');
 
 const { UDP, SendWrap } = process.binding('udp_wrap');
 
@@ -526,7 +525,10 @@ Socket.prototype.close = function(callback) {
   this._stopReceiving();
   this._handle.close();
   this._handle = null;
-  nextTick(this[async_id_symbol], socketCloseNT, this);
+  defaultTriggerAsyncIdScope(this[async_id_symbol],
+                             process.nextTick,
+                             socketCloseNT,
+                             this);
 
   return this;
 };

lib/internal/async_hooks.js

@@ -281,6 +281,8 @@ function clearDefaultTriggerAsyncId() {
 
 
 function defaultTriggerAsyncIdScope(triggerAsyncId, block, ...args) {
+  if (triggerAsyncId === undefined)
+    return Reflect.apply(block, null, args);
   // CHECK(Number.isSafeInteger(triggerAsyncId))
   // CHECK(triggerAsyncId > 0)
   const oldDefaultTriggerAsyncId = async_id_fields[kDefaultTriggerAsyncId];

lib/internal/process/next_tick.js

@@ -1,8 +1,6 @@
 'use strict';
 
 exports.setup = setupNextTick;
-// Will be overwritten when setupNextTick() is called.
-exports.nextTick = null;
 
 function setupNextTick() {
   const {
@@ -87,9 +85,6 @@ function setupNextTick() {
   // Needs to be accessible from beyond this scope.
   process._tickCallback = _tickCallback;
 
-  // Set the nextTick() function for internal usage.
-  exports.nextTick = internalNextTick;
-
   function _tickCallback() {
     let tock;
     do {
@@ -165,32 +160,4 @@ function setupNextTick() {
 
     push(new TickObject(callback, args, getDefaultTriggerAsyncId()));
   }
-
-  // `internalNextTick()` will not enqueue any callback when the process is
-  // about to exit since the callback would not have a chance to be executed.
-  function internalNextTick(triggerAsyncId, callback) {
-    if (typeof callback !== 'function')
-      throw new ERR_INVALID_CALLBACK();
-    // CHECK(Number.isSafeInteger(triggerAsyncId) || triggerAsyncId === null)
-    // CHECK(triggerAsyncId > 0 || triggerAsyncId === null)
-
-    if (process._exiting)
-      return;
-
-    var args;
-    switch (arguments.length) {
-      case 2: break;
-      case 3: args = [arguments[2]]; break;
-      case 4: args = [arguments[2], arguments[3]]; break;
-      case 5: args = [arguments[2], arguments[3], arguments[4]]; break;
-      default:
-        args = new Array(arguments.length - 2);
-        for (var i = 2; i < arguments.length; i++)
-          args[i - 2] = arguments[i];
-    }
-
-    if (triggerAsyncId === null)
-      triggerAsyncId = getDefaultTriggerAsyncId();
-    push(new TickObject(callback, args, triggerAsyncId));
-  }
 }

lib/net.js

@@ -52,7 +52,6 @@ const {
   defaultTriggerAsyncIdScope,
   symbols: { async_id_symbol }
 } = require('internal/async_hooks');
-const { nextTick } = require('internal/process/next_tick');
 const errors = require('internal/errors');
 const {
   ERR_INVALID_ARG_TYPE,
@@ -392,7 +391,7 @@ function writeAfterFIN(chunk, encoding, cb) {
   // TODO: defer error events consistently everywhere, not just the cb
   this.emit('error', er);
   if (typeof cb === 'function') {
-    nextTick(this[async_id_symbol], cb, er);
+    defaultTriggerAsyncIdScope(this[async_id_symbol], process.nextTick, cb, er);
   }
 }
 
@@ -1069,7 +1068,7 @@ function lookupAndConnect(self, options) {
   // If host is an IP, skip performing a lookup
   var addressType = isIP(host);
   if (addressType) {
-    nextTick(self[async_id_symbol], function() {
+    defaultTriggerAsyncIdScope(self[async_id_symbol], process.nextTick, () => {
       if (self.connecting)
         defaultTriggerAsyncIdScope(
           self[async_id_symbol],
@@ -1372,7 +1371,11 @@ function setupListenHandle(address, port, addressType, backlog, fd) {
     var ex = exceptionWithHostPort(err, 'listen', address, port);
     this._handle.close();
     this._handle = null;
-    nextTick(this[async_id_symbol], emitErrorNT, this, ex);
+    defaultTriggerAsyncIdScope(this[async_id_symbol],
+                               process.nextTick,
+                               emitErrorNT,
+                               this,
+                               ex);
     return;
   }
 
@@ -1383,7 +1386,10 @@ function setupListenHandle(address, port, addressType, backlog, fd) {
   if (this._unref)
     this.unref();
 
-  nextTick(this[async_id_symbol], emitListeningNT, this);
+  defaultTriggerAsyncIdScope(this[async_id_symbol],
+                             process.nextTick,
+                             emitListeningNT,
+                             this);
 }
 
 Server.prototype._listen2 = setupListenHandle;  // legacy alias
@@ -1590,8 +1596,11 @@ Server.prototype.getConnections = function(cb) {
   const self = this;
 
   function end(err, connections) {
-    const asyncId = self._handle ? self[async_id_symbol] : null;
-    nextTick(asyncId, cb, err, connections);
+    defaultTriggerAsyncIdScope(self[async_id_symbol],
+                               process.nextTick,
+                               cb,
+                               err,
+                               connections);
   }
 
   if (!this._usingWorkers) {
@@ -1669,8 +1678,10 @@ Server.prototype._emitCloseIfDrained = function() {
     return;
   }
 
-  const asyncId = this._handle ? this[async_id_symbol] : null;
-  nextTick(asyncId, emitCloseNT, this);
+  defaultTriggerAsyncIdScope(this[async_id_symbol],
+                             process.nextTick,
+                             emitCloseNT,
+                             this);
 };
 
 

test/async-hooks/test-nexttick-default-trigger.js

@@ -0,0 +1,28 @@
+'use strict';
+const common = require('../common');
+
+// This tests ensures that the triggerId of the nextTick function sets the
+// triggerAsyncId correctly.
+
+const assert = require('assert');
+const async_hooks = require('async_hooks');
+const initHooks = require('./init-hooks');
+const { checkInvocations } = require('./hook-checks');
+
+const hooks = initHooks();
+hooks.enable();
+
+const rootAsyncId = async_hooks.executionAsyncId();
+
+process.nextTick(common.mustCall(function() {
+  assert.strictEqual(async_hooks.triggerAsyncId(), rootAsyncId);
+}));
+
+process.on('exit', function() {
+  hooks.sanityCheck();
+
+  const as = hooks.activitiesOfTypes('TickObject');
+  checkInvocations(as[0], {
+    init: 1, before: 1, after: 1, destroy: 1
+  }, 'when process exits');
+});

test/async-hooks/test-no-assert-when-disabled.js

@@ -1,15 +1,8 @@
 'use strict';
 // Flags: --no-force-async-hooks-checks --expose-internals
-const common = require('../common');
+require('../common');
 
 const async_hooks = require('internal/async_hooks');
-const internal = require('internal/process/next_tick');
-
-// Using undefined as the triggerAsyncId.
-// Ref: https://github.com/nodejs/node/issues/14386
-// Ref: https://github.com/nodejs/node/issues/14381
-// Ref: https://github.com/nodejs/node/issues/14368
-internal.nextTick(undefined, common.mustCall());
 
 // Negative asyncIds and invalid type name
 async_hooks.emitInit(-1, null, -1, {});