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https://github.com/go-gitea/gitea
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e6103955cc
Fix #30643 The old test code is not stable due to the data-race described in the TODO added at that time. Make it stable, and remove a debug-only field from old test code.
286 lines
9.2 KiB
Go
286 lines
9.2 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package queue
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import (
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"context"
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"slices"
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"strconv"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/test"
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"github.com/stretchr/testify/assert"
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)
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func runWorkerPoolQueue[T any](q *WorkerPoolQueue[T]) func() {
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go q.Run()
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return func() {
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q.ShutdownWait(1 * time.Second)
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}
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}
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func TestWorkerPoolQueueUnhandled(t *testing.T) {
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oldUnhandledItemRequeueDuration := unhandledItemRequeueDuration.Load()
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unhandledItemRequeueDuration.Store(0)
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defer unhandledItemRequeueDuration.Store(oldUnhandledItemRequeueDuration)
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mu := sync.Mutex{}
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test := func(t *testing.T, queueSetting setting.QueueSettings) {
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queueSetting.Length = 100
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queueSetting.Type = "channel"
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queueSetting.Datadir = t.TempDir() + "/test-queue"
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m := map[int]int{}
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// odds are handled once, evens are handled twice
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handler := func(items ...int) (unhandled []int) {
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testRecorder.Record("handle:%v", items)
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for _, item := range items {
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mu.Lock()
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if item%2 == 0 && m[item] == 0 {
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unhandled = append(unhandled, item)
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}
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m[item]++
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mu.Unlock()
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}
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return unhandled
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}
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q, _ := newWorkerPoolQueueForTest("test-workpoolqueue", queueSetting, handler, false)
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stop := runWorkerPoolQueue(q)
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for i := 0; i < queueSetting.Length; i++ {
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testRecorder.Record("push:%v", i)
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assert.NoError(t, q.Push(i))
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}
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assert.NoError(t, q.FlushWithContext(context.Background(), 0))
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stop()
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ok := true
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for i := 0; i < queueSetting.Length; i++ {
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if i%2 == 0 {
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ok = ok && assert.EqualValues(t, 2, m[i], "test %s: item %d", t.Name(), i)
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} else {
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ok = ok && assert.EqualValues(t, 1, m[i], "test %s: item %d", t.Name(), i)
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}
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}
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if !ok {
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t.Logf("m: %v", m)
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t.Logf("records: %v", testRecorder.Records())
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}
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testRecorder.Reset()
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}
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runCount := 2 // we can run these tests even hundreds times to see its stability
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t.Run("1/1", func(t *testing.T) {
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for i := 0; i < runCount; i++ {
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test(t, setting.QueueSettings{BatchLength: 1, MaxWorkers: 1})
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}
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})
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t.Run("3/1", func(t *testing.T) {
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for i := 0; i < runCount; i++ {
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test(t, setting.QueueSettings{BatchLength: 3, MaxWorkers: 1})
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}
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})
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t.Run("4/5", func(t *testing.T) {
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for i := 0; i < runCount; i++ {
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test(t, setting.QueueSettings{BatchLength: 4, MaxWorkers: 5})
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}
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})
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}
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func TestWorkerPoolQueuePersistence(t *testing.T) {
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runCount := 2 // we can run these tests even hundreds times to see its stability
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t.Run("1/1", func(t *testing.T) {
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for i := 0; i < runCount; i++ {
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testWorkerPoolQueuePersistence(t, setting.QueueSettings{BatchLength: 1, MaxWorkers: 1, Length: 100})
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}
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})
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t.Run("3/1", func(t *testing.T) {
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for i := 0; i < runCount; i++ {
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testWorkerPoolQueuePersistence(t, setting.QueueSettings{BatchLength: 3, MaxWorkers: 1, Length: 100})
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}
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})
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t.Run("4/5", func(t *testing.T) {
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for i := 0; i < runCount; i++ {
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testWorkerPoolQueuePersistence(t, setting.QueueSettings{BatchLength: 4, MaxWorkers: 5, Length: 100})
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}
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})
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}
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func testWorkerPoolQueuePersistence(t *testing.T, queueSetting setting.QueueSettings) {
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testCount := queueSetting.Length
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queueSetting.Type = "level"
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queueSetting.Datadir = t.TempDir() + "/test-queue"
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mu := sync.Mutex{}
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var tasksQ1, tasksQ2 []string
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q1 := func() {
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startWhenAllReady := make(chan struct{}) // only start data consuming when the "testCount" tasks are all pushed into queue
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stopAt20Shutdown := make(chan struct{}) // stop and shutdown at the 20th item
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testHandler := func(data ...string) []string {
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<-startWhenAllReady
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time.Sleep(10 * time.Millisecond)
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for _, s := range data {
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mu.Lock()
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tasksQ1 = append(tasksQ1, s)
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mu.Unlock()
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if s == "task-20" {
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close(stopAt20Shutdown)
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}
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}
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return nil
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}
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q, _ := newWorkerPoolQueueForTest("pr_patch_checker_test", queueSetting, testHandler, true)
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stop := runWorkerPoolQueue(q)
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for i := 0; i < testCount; i++ {
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_ = q.Push("task-" + strconv.Itoa(i))
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}
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close(startWhenAllReady)
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<-stopAt20Shutdown // it's possible to have more than 20 tasks executed
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stop()
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}
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q1() // run some tasks and shutdown at an intermediate point
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time.Sleep(100 * time.Millisecond) // because the handler in q1 has a slight delay, we need to wait for it to finish
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q2 := func() {
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testHandler := func(data ...string) []string {
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for _, s := range data {
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mu.Lock()
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tasksQ2 = append(tasksQ2, s)
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mu.Unlock()
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}
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return nil
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}
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q, _ := newWorkerPoolQueueForTest("pr_patch_checker_test", queueSetting, testHandler, true)
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stop := runWorkerPoolQueue(q)
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assert.NoError(t, q.FlushWithContext(context.Background(), 0))
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stop()
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}
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q2() // restart the queue to continue to execute the tasks in it
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assert.NotZero(t, len(tasksQ1))
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assert.NotZero(t, len(tasksQ2))
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assert.EqualValues(t, testCount, len(tasksQ1)+len(tasksQ2))
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}
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func TestWorkerPoolQueueActiveWorkers(t *testing.T) {
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defer test.MockVariableValue(&workerIdleDuration, 300*time.Millisecond)()
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handler := func(items ...int) (unhandled []int) {
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time.Sleep(100 * time.Millisecond)
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return nil
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}
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q, _ := newWorkerPoolQueueForTest("test-workpoolqueue", setting.QueueSettings{Type: "channel", BatchLength: 1, MaxWorkers: 1, Length: 100}, handler, false)
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stop := runWorkerPoolQueue(q)
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for i := 0; i < 5; i++ {
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assert.NoError(t, q.Push(i))
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}
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time.Sleep(50 * time.Millisecond)
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assert.EqualValues(t, 1, q.GetWorkerNumber())
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assert.EqualValues(t, 1, q.GetWorkerActiveNumber())
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time.Sleep(500 * time.Millisecond)
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assert.EqualValues(t, 1, q.GetWorkerNumber())
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assert.EqualValues(t, 0, q.GetWorkerActiveNumber())
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time.Sleep(workerIdleDuration)
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assert.EqualValues(t, 1, q.GetWorkerNumber()) // there is at least one worker after the queue begins working
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stop()
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q, _ = newWorkerPoolQueueForTest("test-workpoolqueue", setting.QueueSettings{Type: "channel", BatchLength: 1, MaxWorkers: 3, Length: 100}, handler, false)
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stop = runWorkerPoolQueue(q)
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for i := 0; i < 15; i++ {
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assert.NoError(t, q.Push(i))
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}
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time.Sleep(50 * time.Millisecond)
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assert.EqualValues(t, 3, q.GetWorkerNumber())
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assert.EqualValues(t, 3, q.GetWorkerActiveNumber())
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time.Sleep(500 * time.Millisecond)
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assert.EqualValues(t, 3, q.GetWorkerNumber())
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assert.EqualValues(t, 0, q.GetWorkerActiveNumber())
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time.Sleep(workerIdleDuration)
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assert.EqualValues(t, 1, q.GetWorkerNumber()) // there is at least one worker after the queue begins working
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stop()
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}
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func TestWorkerPoolQueueShutdown(t *testing.T) {
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oldUnhandledItemRequeueDuration := unhandledItemRequeueDuration.Load()
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unhandledItemRequeueDuration.Store(int64(100 * time.Millisecond))
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defer unhandledItemRequeueDuration.Store(oldUnhandledItemRequeueDuration)
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// simulate a slow handler, it doesn't handle any item (all items will be pushed back to the queue)
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handlerCalled := make(chan struct{})
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handler := func(items ...int) (unhandled []int) {
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if items[0] == 0 {
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close(handlerCalled)
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}
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time.Sleep(400 * time.Millisecond)
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return items
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}
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qs := setting.QueueSettings{Type: "level", Datadir: t.TempDir() + "/queue", BatchLength: 3, MaxWorkers: 4, Length: 20}
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q, _ := newWorkerPoolQueueForTest("test-workpoolqueue", qs, handler, false)
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stop := runWorkerPoolQueue(q)
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for i := 0; i < qs.Length; i++ {
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assert.NoError(t, q.Push(i))
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}
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<-handlerCalled
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time.Sleep(200 * time.Millisecond) // wait for a while to make sure all workers are active
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assert.EqualValues(t, 4, q.GetWorkerActiveNumber())
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stop() // stop triggers shutdown
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assert.EqualValues(t, 0, q.GetWorkerActiveNumber())
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// no item was ever handled, so we still get all of them again
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q, _ = newWorkerPoolQueueForTest("test-workpoolqueue", qs, handler, false)
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assert.EqualValues(t, 20, q.GetQueueItemNumber())
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}
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func TestWorkerPoolQueueWorkerIdleReset(t *testing.T) {
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defer test.MockVariableValue(&workerIdleDuration, 10*time.Millisecond)()
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defer mockBackoffDuration(5 * time.Millisecond)()
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var q *WorkerPoolQueue[int]
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var handledCount atomic.Int32
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var hasOnlyOneWorkerRunning atomic.Bool
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handler := func(items ...int) (unhandled []int) {
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handledCount.Add(int32(len(items)))
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// make each work have different duration, and check the active worker number periodically
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var activeNums []int
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for i := 0; i < 5-items[0]%2; i++ {
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time.Sleep(workerIdleDuration * 2)
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activeNums = append(activeNums, q.GetWorkerActiveNumber())
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}
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// When the queue never becomes empty, the existing workers should keep working
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// It is not 100% true at the moment because the data-race in workergroup.go is not resolved, see that TODO */
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// If the "active worker numbers" is like [2 2 ... 1 1], it means that an existing worker exited and the no new worker is started.
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if slices.Equal([]int{1, 1}, activeNums[len(activeNums)-2:]) {
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hasOnlyOneWorkerRunning.Store(true)
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}
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return nil
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}
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q, _ = newWorkerPoolQueueForTest("test-workpoolqueue", setting.QueueSettings{Type: "channel", BatchLength: 1, MaxWorkers: 2, Length: 100}, handler, false)
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stop := runWorkerPoolQueue(q)
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for i := 0; i < 100; i++ {
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assert.NoError(t, q.Push(i))
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}
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time.Sleep(500 * time.Millisecond)
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assert.Greater(t, int(handledCount.Load()), 4) // make sure there are enough items handled during the test
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assert.False(t, hasOnlyOneWorkerRunning.Load(), "a slow handler should not block other workers from starting")
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stop()
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}
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