gitea/services/mirror/mirror.go

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// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package mirror
import (
"context"
"fmt"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/queue"
"code.gitea.io/gitea/modules/setting"
)
// doMirrorSync causes this request to mirror itself
func doMirrorSync(ctx context.Context, req *SyncRequest) {
if req.ReferenceID == 0 {
log.Warn("Skipping mirror sync request, no mirror ID was specified")
return
}
switch req.Type {
case PushMirrorType:
_ = SyncPushMirror(ctx, req.ReferenceID)
case PullMirrorType:
_ = SyncPullMirror(ctx, req.ReferenceID)
default:
log.Error("Unknown Request type in queue: %v for MirrorID[%d]", req.Type, req.ReferenceID)
}
}
var errLimit = fmt.Errorf("reached limit")
// Update checks and updates mirror repositories.
func Update(ctx context.Context, pullLimit, pushLimit int) error {
if !setting.Mirror.Enabled {
log.Warn("Mirror feature disabled, but cron job enabled: skip update")
return nil
}
log.Trace("Doing: Update")
handler := func(bean any) error {
var repo *repo_model.Repository
var mirrorType SyncType
var referenceID int64
if m, ok := bean.(*repo_model.Mirror); ok {
if m.GetRepository(ctx) == nil {
log.Error("Disconnected mirror found: %d", m.ID)
return nil
}
repo = m.Repo
mirrorType = PullMirrorType
referenceID = m.RepoID
} else if m, ok := bean.(*repo_model.PushMirror); ok {
if m.GetRepository(ctx) == nil {
log.Error("Disconnected push-mirror found: %d", m.ID)
return nil
}
repo = m.Repo
mirrorType = PushMirrorType
referenceID = m.ID
} else {
log.Error("Unknown bean: %v", bean)
return nil
}
// Check we've not been cancelled
select {
case <-ctx.Done():
return fmt.Errorf("aborted")
default:
}
// Push to the Queue
if err := PushToQueue(mirrorType, referenceID); err != nil {
if err == queue.ErrAlreadyInQueue {
if mirrorType == PushMirrorType {
log.Trace("PushMirrors for %-v already queued for sync", repo)
} else {
log.Trace("PullMirrors for %-v already queued for sync", repo)
}
return nil
}
return err
}
return nil
}
pullMirrorsRequested := 0
if pullLimit != 0 {
if err := repo_model.MirrorsIterate(ctx, pullLimit, func(_ int, bean any) error {
if err := handler(bean); err != nil {
return err
}
pullMirrorsRequested++
return nil
}); err != nil && err != errLimit {
log.Error("MirrorsIterate: %v", err)
return err
}
}
pushMirrorsRequested := 0
if pushLimit != 0 {
if err := repo_model.PushMirrorsIterate(ctx, pushLimit, func(idx int, bean any) error {
if err := handler(bean); err != nil {
return err
}
pushMirrorsRequested++
return nil
}); err != nil && err != errLimit {
log.Error("PushMirrorsIterate: %v", err)
return err
}
}
log.Trace("Finished: Update: %d pull mirrors and %d push mirrors queued", pullMirrorsRequested, pushMirrorsRequested)
return nil
}
func queueHandler(items ...*SyncRequest) []*SyncRequest {
Rewrite queue (#24505) # ⚠️ 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)
2023-05-08 13:49:59 +02:00
for _, req := range items {
doMirrorSync(graceful.GetManager().ShutdownContext(), req)
}
return nil
}
// InitSyncMirrors initializes a go routine to sync the mirrors
func InitSyncMirrors() {
StartSyncMirrors(queueHandler)
}