async_hooks: consistent internal naming

PR-URL: https://github.com/nodejs/node/pull/15569
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

4 files changed, 77 insertions, 66 deletions

diff --git a/lib/async_hooks.js b/lib/async_hooks.js
index 37ff565064..9bb3a993af 100644
--- a/lib/async_hooks.js
+++ b/lib/async_hooks.js
@@ -6,20 +6,21 @@ const errors = require('internal/errors');
  * Environment::AsyncHooks::fields_[]. Each index tracks the number of active
  * hooks for each type.
  *
- * async_uid_fields is a Float64Array wrapping the double array of
+ * async_id_fields is a Float64Array wrapping the double array of
  * Environment::AsyncHooks::uid_fields_[]. Each index contains the ids for the
  * various asynchronous states of the application. These are:
- *  kCurrentAsyncId: The async_id assigned to the resource responsible for the
+ *  kExecutionAsyncId: The async_id assigned to the resource responsible for the
  *    current execution stack.
- *  kCurrentTriggerId: The trigger_async_id of the resource responsible for the
- *    current execution stack.
- *  kAsyncUidCntr: Incremental counter tracking the next assigned async_id.
- *  kInitTriggerId: Written immediately before a resource's constructor that
- *    sets the value of the init()'s triggerAsyncId. The order of retrieving
- *    the triggerAsyncId value is passing directly to the constructor -> value
- *   set in kInitTriggerId -> executionAsyncId of the current resource.
+ *  kTriggerAsyncId: The trigger_async_id of the resource responsible for
+ *    the current execution stack.
+ *  kAsyncIdCounter: Incremental counter tracking the next assigned async_id.
+ *  kInitTriggerAsyncId: Written immediately before a resource's constructor
+ *    that sets the value of the init()'s triggerAsyncId. The order of
+ *    retrieving the triggerAsyncId value is passing directly to the
+ *    constructor -> value set in kInitTriggerAsyncId -> executionAsyncId of
+ *    the current resource.
  */
-const { async_hook_fields, async_uid_fields } = async_wrap;
+const { async_hook_fields, async_id_fields } = async_wrap;
 // Store the pair executionAsyncId and triggerAsyncId in a std::stack on
 // Environment::AsyncHooks::ids_stack_ tracks the resource responsible for the
 // current execution stack. This is unwound as each resource exits. In the case
@@ -58,14 +59,14 @@ const active_hooks = {
 // 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, kPromiseResolve, kTotals,
-        kCurrentAsyncId, kCurrentTriggerId, kAsyncUidCntr,
-        kInitTriggerId } = async_wrap.constants;
+const { kInit, kBefore, kAfter, kDestroy, kTotals, kPromiseResolve,
+        kExecutionAsyncId, kTriggerAsyncId, kAsyncIdCounter,
+        kInitTriggerAsyncId } = async_wrap.constants;
 
 // Symbols used to store the respective ids on both AsyncResource instances and
 // internal resources. They will also be assigned to arbitrary objects passed
 // in by the user that take place of internally constructed objects.
-const { async_id_symbol, trigger_id_symbol } = async_wrap;
+const { async_id_symbol, trigger_async_id_symbol } = async_wrap;
 
 // Used in AsyncHook and AsyncResource.
 const init_symbol = Symbol('init');
@@ -234,12 +235,12 @@ function createHook(fns) {
 
 
 function executionAsyncId() {
-  return async_uid_fields[kCurrentAsyncId];
+  return async_id_fields[kExecutionAsyncId];
 }
 
 
 function triggerAsyncId() {
-  return async_uid_fields[kCurrentTriggerId];
+  return async_id_fields[kTriggerAsyncId];
 }
 
 
@@ -258,14 +259,16 @@ class AsyncResource {
                                   triggerAsyncId);
     }
 
-    this[async_id_symbol] = ++async_uid_fields[kAsyncUidCntr];
-    this[trigger_id_symbol] = triggerAsyncId;
+    this[async_id_symbol] = ++async_id_fields[kAsyncIdCounter];
+    this[trigger_async_id_symbol] = triggerAsyncId;
 
-    emitInitScript(this[async_id_symbol], type, this[trigger_id_symbol], this);
+    emitInitScript(
+      this[async_id_symbol], type, this[trigger_async_id_symbol], this
+    );
   }
 
   emitBefore() {
-    emitBeforeScript(this[async_id_symbol], this[trigger_id_symbol]);
+    emitBeforeScript(this[async_id_symbol], this[trigger_async_id_symbol]);
     return this;
   }
 
@@ -284,7 +287,7 @@ class AsyncResource {
   }
 
   triggerAsyncId() {
-    return this[trigger_id_symbol];
+    return this[trigger_async_id_symbol];
   }
 }
 
@@ -308,7 +311,7 @@ function runInAsyncIdScope(asyncId, cb) {
 // counter increment first. Since it's done the same way in
 // Environment::new_async_uid()
 function newUid() {
-  return ++async_uid_fields[kAsyncUidCntr];
+  return ++async_id_fields[kAsyncIdCounter];
 }
 
 
@@ -316,20 +319,20 @@ function newUid() {
 // the user to safeguard this call and make sure it's zero'd out when the
 // constructor is complete.
 function initTriggerId() {
-  var tId = async_uid_fields[kInitTriggerId];
+  var triggerAsyncId = async_id_fields[kInitTriggerAsyncId];
   // Reset value after it's been called so the next constructor doesn't
   // inherit it by accident.
-  async_uid_fields[kInitTriggerId] = 0;
-  if (tId <= 0)
-    tId = async_uid_fields[kCurrentAsyncId];
-  return tId;
+  async_id_fields[kInitTriggerAsyncId] = 0;
+  if (triggerAsyncId <= 0)
+    triggerAsyncId = async_id_fields[kExecutionAsyncId];
+  return triggerAsyncId;
 }
 
 
 function setInitTriggerId(triggerAsyncId) {
   // CHECK(Number.isSafeInteger(triggerAsyncId))
   // CHECK(triggerAsyncId > 0)
-  async_uid_fields[kInitTriggerId] = triggerAsyncId;
+  async_id_fields[kInitTriggerAsyncId] = triggerAsyncId;
 }
 
 
@@ -346,8 +349,9 @@ function emitInitScript(asyncId, type, triggerAsyncId, resource) {
   if (triggerAsyncId === null) {
     triggerAsyncId = initTriggerId();
   } else {
-    // If a triggerAsyncId was passed, any kInitTriggerId still must be null'd.
-    async_uid_fields[kInitTriggerId] = 0;
+    // If a triggerAsyncId was passed, any kInitTriggerAsyncId still must be
+    // null'd.
+    async_id_fields[kInitTriggerAsyncId] = 0;
   }
 
   if (!Number.isSafeInteger(asyncId) || asyncId < -1) {
@@ -446,7 +450,7 @@ function emitDestroyScript(asyncId) {
   // Return early if there are no destroy callbacks, or invalid asyncId.
   if (async_hook_fields[kDestroy] === 0 || asyncId <= 0)
     return;
-  async_wrap.addIdToDestroyList(asyncId);
+  async_wrap.queueDestroyAsyncId(asyncId);
 }
 
 
diff --git a/lib/internal/bootstrap_node.js b/lib/internal/bootstrap_node.js
index 3ce558611e..4a941b5385 100644
--- a/lib/internal/bootstrap_node.js
+++ b/lib/internal/bootstrap_node.js
@@ -354,17 +354,18 @@
   function setupProcessFatal() {
     const async_wrap = process.binding('async_wrap');
     // Arrays containing hook flags and ids for async_hook calls.
-    const { async_hook_fields, async_uid_fields } = async_wrap;
+    const { async_hook_fields, async_id_fields } = async_wrap;
     // Internal functions needed to manipulate the stack.
-    const { clearIdStack, asyncIdStackSize } = async_wrap;
-    const { kAfter, kCurrentAsyncId, kInitTriggerId } = async_wrap.constants;
+    const { clearAsyncIdStack, asyncIdStackSize } = async_wrap;
+    const { kAfter, kExecutionAsyncId,
+            kInitTriggerAsyncId } = async_wrap.constants;
 
     process._fatalException = function(er) {
       var caught;
 
-      // It's possible that kInitTriggerId was set for a constructor call that
-      // threw and was never cleared. So clear it now.
-      async_uid_fields[kInitTriggerId] = 0;
+      // It's possible that kInitTriggerAsyncId was set for a constructor call
+      // that threw and was never cleared. So clear it now.
+      async_id_fields[kInitTriggerAsyncId] = 0;
 
       if (process.domain && process.domain._errorHandler)
         caught = process.domain._errorHandler(er);
@@ -392,11 +393,11 @@
         if (async_hook_fields[kAfter] > 0) {
           do {
             NativeModule.require('async_hooks').emitAfter(
-              async_uid_fields[kCurrentAsyncId]);
+              async_id_fields[kExecutionAsyncId]);
           } while (asyncIdStackSize() > 0);
         // Or completely empty the id stack.
         } else {
-          clearIdStack();
+          clearAsyncIdStack();
         }
       }
 
diff --git a/lib/internal/process/next_tick.js b/lib/internal/process/next_tick.js
index 00698aee23..3854389a0e 100644
--- a/lib/internal/process/next_tick.js
+++ b/lib/internal/process/next_tick.js
@@ -54,12 +54,12 @@ function setupNextTick() {
   const emitPendingUnhandledRejections = promises.setup(scheduleMicrotasks);
   const initTriggerId = async_hooks.initTriggerId;
   // Two arrays that share state between C++ and JS.
-  const { async_hook_fields, async_uid_fields } = async_wrap;
+  const { async_hook_fields, async_id_fields } = async_wrap;
   // Used to change the state of the async id stack.
   const { emitInit, emitBefore, emitAfter, emitDestroy } = async_hooks;
   // Grab the constants necessary for working with internal arrays.
-  const { kInit, kDestroy, kAsyncUidCntr } = async_wrap.constants;
-  const { async_id_symbol, trigger_id_symbol } = async_wrap;
+  const { kInit, kDestroy, kAsyncIdCounter } = async_wrap.constants;
+  const { async_id_symbol, trigger_async_id_symbol } = async_wrap;
   var nextTickQueue = new NextTickQueue();
   var microtasksScheduled = false;
 
@@ -102,7 +102,7 @@ function setupNextTick() {
     args: undefined,
     domain: null,
     [async_id_symbol]: 0,
-    [trigger_id_symbol]: 0
+    [trigger_async_id_symbol]: 0
   };
   function scheduleMicrotasks() {
     if (microtasksScheduled)
@@ -158,10 +158,10 @@ function setupNextTick() {
 
         // CHECK(Number.isSafeInteger(tock[async_id_symbol]))
         // CHECK(tock[async_id_symbol] > 0)
-        // CHECK(Number.isSafeInteger(tock[trigger_id_symbol]))
-        // CHECK(tock[trigger_id_symbol] > 0)
+        // CHECK(Number.isSafeInteger(tock[trigger_async_id_symbol]))
+        // CHECK(tock[trigger_async_id_symbol] > 0)
 
-        emitBefore(tock[async_id_symbol], tock[trigger_id_symbol]);
+        emitBefore(tock[async_id_symbol], tock[trigger_async_id_symbol]);
         // emitDestroy() places the async_id_symbol into an asynchronous queue
         // that calls the destroy callback in the future. It's called before
         // calling tock.callback so destroy will be called even if the callback
@@ -203,10 +203,10 @@ function setupNextTick() {
 
         // CHECK(Number.isSafeInteger(tock[async_id_symbol]))
         // CHECK(tock[async_id_symbol] > 0)
-        // CHECK(Number.isSafeInteger(tock[trigger_id_symbol]))
-        // CHECK(tock[trigger_id_symbol] > 0)
+        // CHECK(Number.isSafeInteger(tock[trigger_async_id_symbol]))
+        // CHECK(tock[trigger_async_id_symbol] > 0)
 
-        emitBefore(tock[async_id_symbol], tock[trigger_id_symbol]);
+        emitBefore(tock[async_id_symbol], tock[trigger_async_id_symbol]);
         // TODO(trevnorris): See comment in _tickCallback() as to why this
         // isn't a good solution.
         if (async_hook_fields[kDestroy] > 0)
@@ -236,7 +236,7 @@ function setupNextTick() {
       this.args = args;
       this.domain = process.domain || null;
       this[async_id_symbol] = asyncId;
-      this[trigger_id_symbol] = triggerAsyncId;
+      this[trigger_async_id_symbol] = triggerAsyncId;
     }
   }
 
@@ -261,7 +261,7 @@ function setupNextTick() {
           args[i - 1] = arguments[i];
     }
 
-    const asyncId = ++async_uid_fields[kAsyncUidCntr];
+    const asyncId = ++async_id_fields[kAsyncIdCounter];
     const triggerAsyncId = initTriggerId();
     const obj = new TickObject(callback, args, asyncId, triggerAsyncId);
     nextTickQueue.push(obj);
@@ -297,7 +297,7 @@ function setupNextTick() {
           args[i - 2] = arguments[i];
     }
 
-    const asyncId = ++async_uid_fields[kAsyncUidCntr];
+    const asyncId = ++async_id_fields[kAsyncIdCounter];
     const obj = new TickObject(callback, args, asyncId, triggerAsyncId);
     nextTickQueue.push(obj);
     ++tickInfo[kLength];
diff --git a/lib/timers.js b/lib/timers.js
index 7bfed79d15..1c41d5d0f3 100644
--- a/lib/timers.js
+++ b/lib/timers.js
@@ -34,14 +34,14 @@ const debug = util.debuglog('timer');
 const kOnTimeout = TimerWrap.kOnTimeout | 0;
 const initTriggerId = async_hooks.initTriggerId;
 // Two arrays that share state between C++ and JS.
-const { async_hook_fields, async_uid_fields } = async_wrap;
+const { async_hook_fields, async_id_fields } = async_wrap;
 // The needed emit*() functions.
 const { emitInit, emitBefore, emitAfter, emitDestroy } = async_hooks;
 // Grab the constants necessary for working with internal arrays.
-const { kInit, kDestroy, kAsyncUidCntr } = async_wrap.constants;
+const { kInit, kDestroy, kAsyncIdCounter } = async_wrap.constants;
 // Symbols for storing async id state.
 const async_id_symbol = Symbol('asyncId');
-const trigger_id_symbol = Symbol('triggerAsyncId');
+const trigger_async_id_symbol = Symbol('triggerAsyncId');
 
 // Timeout values > TIMEOUT_MAX are set to 1.
 const TIMEOUT_MAX = 2147483647; // 2^31-1
@@ -169,10 +169,12 @@ function insert(item, unrefed) {
 
   if (!item[async_id_symbol] || item._destroyed) {
     item._destroyed = false;
-    item[async_id_symbol] = ++async_uid_fields[kAsyncUidCntr];
-    item[trigger_id_symbol] = initTriggerId();
+    item[async_id_symbol] = ++async_id_fields[kAsyncIdCounter];
+    item[trigger_async_id_symbol] = initTriggerId();
     if (async_hook_fields[kInit] > 0)
-      emitInit(item[async_id_symbol], 'Timeout', item[trigger_id_symbol], item);
+      emitInit(
+        item[async_id_symbol], 'Timeout', item[trigger_async_id_symbol], item
+      );
   }
 
   L.append(list, item);
@@ -291,7 +293,7 @@ function tryOnTimeout(timer, list) {
     timer[async_id_symbol] : null;
   var threw = true;
   if (timerAsyncId !== null)
-    emitBefore(timerAsyncId, timer[trigger_id_symbol]);
+    emitBefore(timerAsyncId, timer[trigger_async_id_symbol]);
   try {
     ontimeout(timer);
     threw = false;
@@ -560,10 +562,12 @@ function Timeout(after, callback, args) {
   this._timerArgs = args;
   this._repeat = null;
   this._destroyed = false;
-  this[async_id_symbol] = ++async_uid_fields[kAsyncUidCntr];
-  this[trigger_id_symbol] = initTriggerId();
+  this[async_id_symbol] = ++async_id_fields[kAsyncIdCounter];
+  this[trigger_async_id_symbol] = initTriggerId();
   if (async_hook_fields[kInit] > 0)
-    emitInit(this[async_id_symbol], 'Timeout', this[trigger_id_symbol], this);
+    emitInit(
+      this[async_id_symbol], 'Timeout', this[trigger_async_id_symbol], this
+    );
 }
 
 
@@ -733,7 +737,7 @@ function processImmediate() {
 // 4.7) what is in this smaller function.
 function tryOnImmediate(immediate, oldTail) {
   var threw = true;
-  emitBefore(immediate[async_id_symbol], immediate[trigger_id_symbol]);
+  emitBefore(immediate[async_id_symbol], immediate[trigger_async_id_symbol]);
   try {
     // make the actual call outside the try/finally to allow it to be optimized
     runCallback(immediate);
@@ -798,10 +802,12 @@ function Immediate() {
   this._onImmediate = null;
   this._destroyed = false;
   this.domain = process.domain;
-  this[async_id_symbol] = ++async_uid_fields[kAsyncUidCntr];
-  this[trigger_id_symbol] = initTriggerId();
+  this[async_id_symbol] = ++async_id_fields[kAsyncIdCounter];
+  this[trigger_async_id_symbol] = initTriggerId();
   if (async_hook_fields[kInit] > 0)
-    emitInit(this[async_id_symbol], 'Immediate', this[trigger_id_symbol], this);
+    emitInit(
+      this[async_id_symbol], 'Immediate', this[trigger_async_id_symbol], this
+    );
 }
 
 function setImmediate(callback, arg1, arg2, arg3) {