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274 lines
8.9 KiB
274 lines
8.9 KiB
/*
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* Test Steps Explained
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* ====================
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*
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* Initializing hooks:
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*
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* We initialize 3 hooks. For hook2 and hook3 we register a callback for the
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* "before" and in case of hook3 also for the "after" invocations.
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*
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* Enabling hooks initially:
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*
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* We only enable hook1 and hook3 initially.
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*
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* Enabling hook2:
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*
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* When hook3's "before" invocation occurs we enable hook2. Since this
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* happens right before calling `onfirstImmediate` hook2 will miss all hook
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* invocations until then, including the "init" and "before" of the first
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* Immediate.
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* However afterwards it collects all invocations that follow on the first
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* Immediate as well as all invocations on the second Immediate.
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*
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* This shows that a hook can enable another hook inside a life time event
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* callback.
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*
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*
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* Disabling hook1
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*
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* Since we registered the "before" callback for hook2 it will execute it
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* right before `onsecondImmediate` is called.
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* At that point we disable hook1 which is why it will miss all invocations
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* afterwards and thus won't include the second "after" as well as the
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* "destroy" invocations
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*
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* This shows that a hook can disable another hook inside a life time event
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* callback.
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*
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* Disabling hook3
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*
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* When the second "after" invocation occurs (after onsecondImmediate), hook3
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* disables itself.
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* As a result it will not receive the "destroy" invocation.
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*
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* This shows that a hook can disable itself inside a life time event callback.
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*
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* Sample Test Log
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* ===============
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*
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* - setting up first Immediate
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* hook1.init.uid-5
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* hook3.init.uid-5
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* - finished setting first Immediate
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* hook1.before.uid-5
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* hook3.before.uid-5
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* - enabled hook2
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* - entering onfirstImmediate
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* - setting up second Immediate
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* hook1.init.uid-6
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* hook3.init.uid-6
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* hook2.init.uid-6
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* - finished setting second Immediate
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* - exiting onfirstImmediate
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* hook1.after.uid-5
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* hook3.after.uid-5
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* hook2.after.uid-5
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* hook1.destroy.uid-5
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* hook3.destroy.uid-5
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* hook2.destroy.uid-5
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* hook1.before.uid-6
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* hook3.before.uid-6
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* hook2.before.uid-6
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* - disabled hook1
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* - entering onsecondImmediate
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* - exiting onsecondImmediate
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* hook3.after.uid-6
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* - disabled hook3
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* hook2.after.uid-6
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* hook2.destroy.uid-6
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*/
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'use strict';
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const common = require('../common');
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const assert = require('assert');
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const tick = require('./tick');
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const initHooks = require('./init-hooks');
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const { checkInvocations } = require('./hook-checks');
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// Include "Unknown"s because hook2 will not be able to identify
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// the type of the first Immediate since it will miss its `init` invocation.
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const types = [ 'Immediate', 'Unknown' ];
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//
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// Initializing hooks
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//
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const hook1 = initHooks();
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const hook2 = initHooks({ onbefore: onhook2Before, allowNoInit: true });
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const hook3 = initHooks({ onbefore: onhook3Before, onafter: onhook3After });
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//
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// Enabling hook1 and hook3 only, hook2 is still disabled
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//
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hook1.enable();
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hook3.enable();
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//
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// Enabling hook2
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//
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let enabledHook2 = false;
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function onhook3Before() {
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if (enabledHook2) return;
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hook2.enable();
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enabledHook2 = true;
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}
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//
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// Disabling hook1
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//
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let disabledHook3 = false;
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function onhook2Before() {
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if (disabledHook3) return;
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hook1.disable();
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disabledHook3 = true;
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}
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//
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// Disabling hook3 during the second "after" invocations it sees
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//
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let count = 2;
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function onhook3After() {
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if (!--count) {
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hook3.disable();
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}
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}
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setImmediate(common.mustCall(onfirstImmediate));
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//
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// onfirstImmediate is called after all "init" and "before" callbacks of the
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// active hooks were invoked
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//
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function onfirstImmediate() {
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const as1 = hook1.activitiesOfTypes(types);
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const as2 = hook2.activitiesOfTypes(types);
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const as3 = hook3.activitiesOfTypes(types);
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assert.strictEqual(as1.length, 1,
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'hook1 captured one immediate on first callback');
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// hook2 was not enabled yet .. it is enabled after hook3's "before" completed
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assert.strictEqual(as2.length, 0,
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'hook2 captured no immediate on first callback');
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assert.strictEqual(as3.length, 1,
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'hook3 captured one immediate on first callback');
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// Check that hook1 and hook3 captured the same Immediate and that it is valid
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const firstImmediate = as1[0];
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assert.strictEqual(as3[0].uid, as1[0].uid,
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'hook1 and hook3 captured same first immediate');
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assert.strictEqual(firstImmediate.type, 'Immediate', 'immediate');
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assert.strictEqual(typeof firstImmediate.uid, 'number', 'uid is a number');
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assert.strictEqual(typeof firstImmediate.triggerId,
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'number', 'triggerId is a number');
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checkInvocations(as1[0], { init: 1, before: 1 },
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'hook1[0]: on first immediate');
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checkInvocations(as3[0], { init: 1, before: 1 },
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'hook3[0]: on first immediate');
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// Setup the second Immediate, note that now hook2 is enabled and thus
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// will capture all lifetime events of this Immediate
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setImmediate(common.mustCall(onsecondImmediate));
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}
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//
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// Once we exit onfirstImmediate the "after" callbacks of the active hooks are
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// invoked
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//
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let hook1First, hook2First, hook3First;
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let hook1Second, hook2Second, hook3Second;
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//
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// onsecondImmediate is called after all "before" callbacks of the active hooks
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// are invoked again
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//
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function onsecondImmediate() {
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const as1 = hook1.activitiesOfTypes(types);
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const as2 = hook2.activitiesOfTypes(types);
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const as3 = hook3.activitiesOfTypes(types);
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assert.strictEqual(
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as1.length, 2,
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'hook1 captured first and second immediate on second callback');
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assert.strictEqual(
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as2.length, 2,
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'hook2 captured first and second immediate on second callback');
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assert.strictEqual(
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as3.length, 2,
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'hook3 captured first and second immediate on second callback');
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// Assign the info collected by each hook for each immediate for easier
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// reference.
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// hook2 saw the "init" of the second immediate before the
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// "after" of the first which is why they are ordered the opposite way
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hook1First = as1[0];
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hook1Second = as1[1];
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hook2First = as2[1];
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hook2Second = as2[0];
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hook3First = as3[0];
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hook3Second = as3[1];
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// Check that all hooks captured the same Immediate and that it is valid
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const secondImmediate = hook1Second;
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assert.strictEqual(hook2Second.uid, hook3Second.uid,
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'hook2 and hook3 captured same second immediate');
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assert.strictEqual(hook1Second.uid, hook3Second.uid,
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'hook1 and hook3 captured same second immediate');
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assert.strictEqual(secondImmediate.type, 'Immediate', 'immediate');
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assert.strictEqual(typeof secondImmediate.uid, 'number', 'uid is a number');
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assert.strictEqual(typeof secondImmediate.triggerId, 'number',
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'triggerId is a number');
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checkInvocations(hook1First, { init: 1, before: 1, after: 1, destroy: 1 },
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'hook1First: on second immediate');
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checkInvocations(hook1Second, { init: 1, before: 1 },
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'hook1Second: on second immediate');
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// hook2 missed the "init" and "before" since it was enabled after they
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// occurred
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checkInvocations(hook2First, { after: 1, destroy: 1 },
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'hook2First: on second immediate');
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checkInvocations(hook2Second, { init: 1, before: 1 },
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'hook2Second: on second immediate');
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checkInvocations(hook3First, { init: 1, before: 1, after: 1, destroy: 1 },
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'hook3First: on second immediate');
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checkInvocations(hook3Second, { init: 1, before: 1 },
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'hook3Second: on second immediate');
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tick(1);
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}
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//
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// Once we exit onsecondImmediate the "after" callbacks of the active hooks are
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// invoked again.
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// During this second "after" invocation hook3 disables itself
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// (see onhook3After).
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//
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process.on('exit', onexit);
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function onexit() {
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hook1.disable();
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hook2.disable();
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hook3.disable();
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hook1.sanityCheck();
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hook2.sanityCheck();
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hook3.sanityCheck();
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checkInvocations(hook1First, { init: 1, before: 1, after: 1, destroy: 1 },
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'hook1First: when process exits');
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// hook1 was disabled during hook2's "before" of the second immediate
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// and thus did not see "after" and "destroy"
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checkInvocations(hook1Second, { init: 1, before: 1 },
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'hook1Second: when process exits');
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// hook2 missed the "init" and "before" since it was enabled after they
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// occurred
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checkInvocations(hook2First, { after: 1, destroy: 1 },
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'hook2First: when process exits');
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checkInvocations(hook2Second, { init: 1, before: 1, after: 1, destroy: 1 },
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'hook2Second: when process exits');
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checkInvocations(hook3First, { init: 1, before: 1, after: 1, destroy: 1 },
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'hook3First: when process exits');
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// we don't see a "destroy" invocation here since hook3 disabled itself
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// during its "after" invocation
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checkInvocations(hook3Second, { init: 1, before: 1, after: 1 },
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'hook3Second: when process exits');
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}
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