mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-19 11:03:26 +02:00
# ⚠️ 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: ![image](https://user-images.githubusercontent.com/2114189/236620635-55576955-f95d-4810-b12f-879026a3afdf.png)
134 lines
3.5 KiB
Go
134 lines
3.5 KiB
Go
// Copyright 2019 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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"context"
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"fmt"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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mirror_module "code.gitea.io/gitea/modules/mirror"
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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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// doMirrorSync causes this request to mirror itself
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func doMirrorSync(ctx context.Context, req *mirror_module.SyncRequest) {
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if req.ReferenceID == 0 {
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log.Warn("Skipping mirror sync request, no mirror ID was specified")
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return
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}
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switch req.Type {
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case mirror_module.PushMirrorType:
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_ = SyncPushMirror(ctx, req.ReferenceID)
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case mirror_module.PullMirrorType:
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_ = SyncPullMirror(ctx, req.ReferenceID)
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default:
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log.Error("Unknown Request type in queue: %v for MirrorID[%d]", req.Type, req.ReferenceID)
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}
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}
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var errLimit = fmt.Errorf("reached limit")
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// Update checks and updates mirror repositories.
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func Update(ctx context.Context, pullLimit, pushLimit int) error {
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if !setting.Mirror.Enabled {
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log.Warn("Mirror feature disabled, but cron job enabled: skip update")
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return nil
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}
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log.Trace("Doing: Update")
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handler := func(idx int, bean interface{}) error {
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var repo *repo_model.Repository
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var mirrorType mirror_module.SyncType
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var referenceID int64
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if m, ok := bean.(*repo_model.Mirror); ok {
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if m.GetRepository() == nil {
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log.Error("Disconnected mirror found: %d", m.ID)
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return nil
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}
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repo = m.Repo
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mirrorType = mirror_module.PullMirrorType
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referenceID = m.RepoID
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} else if m, ok := bean.(*repo_model.PushMirror); ok {
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if m.GetRepository() == nil {
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log.Error("Disconnected push-mirror found: %d", m.ID)
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return nil
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}
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repo = m.Repo
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mirrorType = mirror_module.PushMirrorType
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referenceID = m.ID
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} else {
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log.Error("Unknown bean: %v", bean)
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return nil
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}
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// Check we've not been cancelled
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select {
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case <-ctx.Done():
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return fmt.Errorf("aborted")
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default:
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}
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// Push to the Queue
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if err := mirror_module.PushToQueue(mirrorType, referenceID); err != nil {
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if err == queue.ErrAlreadyInQueue {
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if mirrorType == mirror_module.PushMirrorType {
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log.Trace("PushMirrors for %-v already queued for sync", repo)
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} else {
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log.Trace("PullMirrors for %-v already queued for sync", repo)
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}
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return nil
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}
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return err
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}
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return nil
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}
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pullMirrorsRequested := 0
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if pullLimit != 0 {
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if err := repo_model.MirrorsIterate(pullLimit, func(idx int, bean interface{}) error {
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if err := handler(idx, bean); err != nil {
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return err
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}
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pullMirrorsRequested++
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return nil
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}); err != nil && err != errLimit {
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log.Error("MirrorsIterate: %v", err)
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return err
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}
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}
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pushMirrorsRequested := 0
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if pushLimit != 0 {
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if err := repo_model.PushMirrorsIterate(ctx, pushLimit, func(idx int, bean interface{}) error {
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if err := handler(idx, bean); err != nil {
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return err
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}
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pushMirrorsRequested++
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return nil
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}); err != nil && err != errLimit {
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log.Error("PushMirrorsIterate: %v", err)
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return err
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}
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}
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log.Trace("Finished: Update: %d pull mirrors and %d push mirrors queued", pullMirrorsRequested, pushMirrorsRequested)
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return nil
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}
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func queueHandler(items ...*mirror_module.SyncRequest) []*mirror_module.SyncRequest {
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for _, req := range items {
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doMirrorSync(graceful.GetManager().ShutdownContext(), req)
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}
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return nil
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}
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// InitSyncMirrors initializes a go routine to sync the mirrors
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func InitSyncMirrors() {
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mirror_module.StartSyncMirrors(queueHandler)
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}
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