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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: 
69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package mirror
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import (
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/queue"
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"code.gitea.io/gitea/modules/setting"
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)
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var mirrorQueue *queue.WorkerPoolQueue[*SyncRequest]
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// SyncType type of sync request
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type SyncType int
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const (
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// PullMirrorType for pull mirrors
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PullMirrorType SyncType = iota
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// PushMirrorType for push mirrors
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PushMirrorType
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)
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// SyncRequest for the mirror queue
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type SyncRequest struct {
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Type SyncType
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ReferenceID int64 // RepoID for pull mirror, MirrorID for push mirror
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}
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// StartSyncMirrors starts a go routine to sync the mirrors
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func StartSyncMirrors(queueHandle func(data ...*SyncRequest) []*SyncRequest) {
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if !setting.Mirror.Enabled {
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return
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}
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mirrorQueue = queue.CreateUniqueQueue("mirror", queueHandle)
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go graceful.GetManager().RunWithShutdownFns(mirrorQueue.Run)
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}
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// AddPullMirrorToQueue adds repoID to mirror queue
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func AddPullMirrorToQueue(repoID int64) {
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addMirrorToQueue(PullMirrorType, repoID)
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}
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// AddPushMirrorToQueue adds the push mirror to the queue
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func AddPushMirrorToQueue(mirrorID int64) {
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addMirrorToQueue(PushMirrorType, mirrorID)
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}
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func addMirrorToQueue(syncType SyncType, referenceID int64) {
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if !setting.Mirror.Enabled {
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return
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}
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go func() {
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if err := PushToQueue(syncType, referenceID); err != nil {
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log.Error("Unable to push sync request for to the queue for pull mirror repo[%d]. Error: %v", referenceID, err)
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}
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}()
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}
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// PushToQueue adds the sync request to the queue
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func PushToQueue(mirrorType SyncType, referenceID int64) error {
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return mirrorQueue.Push(&SyncRequest{
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Type: mirrorType,
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ReferenceID: referenceID,
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})
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}
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