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# ⚠️ Breaking Many deprecated queue config options are removed (actually, they should have been removed in 1.18/1.19). If you see the fatal message when starting Gitea: "Please update your app.ini to remove deprecated config options", please follow the error messages to remove these options from your app.ini. Example: ``` 2023/05/06 19:39:22 [E] Removed queue option: `[indexer].ISSUE_INDEXER_QUEUE_TYPE`. Use new options in `[queue.issue_indexer]` 2023/05/06 19:39:22 [E] Removed queue option: `[indexer].UPDATE_BUFFER_LEN`. Use new options in `[queue.issue_indexer]` 2023/05/06 19:39:22 [F] Please update your app.ini to remove deprecated config options ``` Many options in `[queue]` are are dropped, including: `WRAP_IF_NECESSARY`, `MAX_ATTEMPTS`, `TIMEOUT`, `WORKERS`, `BLOCK_TIMEOUT`, `BOOST_TIMEOUT`, `BOOST_WORKERS`, they can be removed from app.ini. # The problem The old queue package has some legacy problems: * complexity: I doubt few people could tell how it works. * maintainability: Too many channels and mutex/cond are mixed together, too many different structs/interfaces depends each other. * stability: due to the complexity & maintainability, sometimes there are strange bugs and difficult to debug, and some code doesn't have test (indeed some code is difficult to test because a lot of things are mixed together). * general applicability: although it is called "queue", its behavior is not a well-known queue. * scalability: it doesn't seem easy to make it work with a cluster without breaking its behaviors. It came from some very old code to "avoid breaking", however, its technical debt is too heavy now. It's a good time to introduce a better "queue" package. # The new queue package It keeps using old config and concept as much as possible. * It only contains two major kinds of concepts: * The "base queue": channel, levelqueue, redis * They have the same abstraction, the same interface, and they are tested by the same testing code. * The "WokerPoolQueue", it uses the "base queue" to provide "worker pool" function, calls the "handler" to process the data in the base queue. * The new code doesn't do "PushBack" * Think about a queue with many workers, the "PushBack" can't guarantee the order for re-queued unhandled items, so in new code it just does "normal push" * The new code doesn't do "pause/resume" * The "pause/resume" was designed to handle some handler's failure: eg: document indexer (elasticsearch) is down * If a queue is paused for long time, either the producers blocks or the new items are dropped. * The new code doesn't do such "pause/resume" trick, it's not a common queue's behavior and it doesn't help much. * If there are unhandled items, the "push" function just blocks for a few seconds and then re-queue them and retry. * The new code doesn't do "worker booster" * Gitea's queue's handlers are light functions, the cost is only the go-routine, so it doesn't make sense to "boost" them. * The new code only use "max worker number" to limit the concurrent workers. * The new "Push" never blocks forever * Instead of creating more and more blocking goroutines, return an error is more friendly to the server and to the end user. There are more details in code comments: eg: the "Flush" problem, the strange "code.index" hanging problem, the "immediate" queue problem. Almost ready for review. TODO: * [x] add some necessary comments during review * [x] add some more tests if necessary * [x] update documents and config options * [x] test max worker / active worker * [x] re-run the CI tasks to see whether any test is flaky * [x] improve the `handleOldLengthConfiguration` to provide more friendly messages * [x] fine tune default config values (eg: length?) ## Code coverage: 
78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
// Copyright 2019 The Gitea Authors.
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// All rights reserved.
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// SPDX-License-Identifier: MIT
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package pull
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import (
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"strconv"
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"testing"
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"time"
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issues_model "code.gitea.io/gitea/models/issues"
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"code.gitea.io/gitea/models/unittest"
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"code.gitea.io/gitea/modules/queue"
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"code.gitea.io/gitea/modules/setting"
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"github.com/stretchr/testify/assert"
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)
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func TestPullRequest_AddToTaskQueue(t *testing.T) {
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assert.NoError(t, unittest.PrepareTestDatabase())
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idChan := make(chan int64, 10)
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testHandler := func(items ...string) []string {
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for _, s := range items {
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id, _ := strconv.ParseInt(s, 10, 64)
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idChan <- id
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}
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return nil
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}
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cfg, err := setting.GetQueueSettings(setting.CfgProvider, "pr_patch_checker")
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assert.NoError(t, err)
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prPatchCheckerQueue, err = queue.NewWorkerPoolQueueBySetting("pr_patch_checker", cfg, testHandler, true)
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assert.NoError(t, err)
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pr := unittest.AssertExistsAndLoadBean(t, &issues_model.PullRequest{ID: 2})
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AddToTaskQueue(pr)
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assert.Eventually(t, func() bool {
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pr = unittest.AssertExistsAndLoadBean(t, &issues_model.PullRequest{ID: 2})
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return pr.Status == issues_model.PullRequestStatusChecking
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}, 1*time.Second, 100*time.Millisecond)
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has, err := prPatchCheckerQueue.Has(strconv.FormatInt(pr.ID, 10))
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assert.True(t, has)
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assert.NoError(t, err)
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var queueShutdown, queueTerminate []func()
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go prPatchCheckerQueue.Run(func(shutdown func()) {
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queueShutdown = append(queueShutdown, shutdown)
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}, func(terminate func()) {
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queueTerminate = append(queueTerminate, terminate)
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})
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select {
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case id := <-idChan:
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assert.EqualValues(t, pr.ID, id)
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case <-time.After(time.Second):
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assert.Fail(t, "Timeout: nothing was added to pullRequestQueue")
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}
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has, err = prPatchCheckerQueue.Has(strconv.FormatInt(pr.ID, 10))
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assert.False(t, has)
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assert.NoError(t, err)
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pr = unittest.AssertExistsAndLoadBean(t, &issues_model.PullRequest{ID: 2})
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assert.Equal(t, issues_model.PullRequestStatusChecking, pr.Status)
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for _, callback := range queueShutdown {
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callback()
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}
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for _, callback := range queueTerminate {
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callback()
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}
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prPatchCheckerQueue = nil
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}
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