From 6f9c278559789066aa831c1df25b0d866103d02d Mon Sep 17 00:00:00 2001 From: wxiaoguang Date: Mon, 8 May 2023 19:49:59 +0800 Subject: Rewrite queue (#24505) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit # ⚠️ 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) --- services/repository/archiver/archiver.go | 15 +++++---------- services/repository/push.go | 9 ++++----- 2 files changed, 9 insertions(+), 15 deletions(-) (limited to 'services/repository') diff --git a/services/repository/archiver/archiver.go b/services/repository/archiver/archiver.go index 1da4425cfc..1c514a4112 100644 --- a/services/repository/archiver/archiver.go +++ b/services/repository/archiver/archiver.go @@ -295,26 +295,21 @@ func ArchiveRepository(request *ArchiveRequest) (*repo_model.RepoArchiver, error return doArchive(request) } -var archiverQueue queue.UniqueQueue +var archiverQueue *queue.WorkerPoolQueue[*ArchiveRequest] // Init initlize archive func Init() error { - handler := func(data ...queue.Data) []queue.Data { - for _, datum := range data { - archiveReq, ok := datum.(*ArchiveRequest) - if !ok { - log.Error("Unable to process provided datum: %v - not possible to cast to IndexerData", datum) - continue - } + handler := func(items ...*ArchiveRequest) []*ArchiveRequest { + for _, archiveReq := range items { log.Trace("ArchiverData Process: %#v", archiveReq) if _, err := doArchive(archiveReq); err != nil { - log.Error("Archive %v failed: %v", datum, err) + log.Error("Archive %v failed: %v", archiveReq, err) } } return nil } - archiverQueue = queue.CreateUniqueQueue("repo-archive", handler, new(ArchiveRequest)) + archiverQueue = queue.CreateUniqueQueue("repo-archive", handler) if archiverQueue == nil { return errors.New("unable to create codes indexer queue") } diff --git a/services/repository/push.go b/services/repository/push.go index 7f174c71b3..c7ea8f336e 100644 --- a/services/repository/push.go +++ b/services/repository/push.go @@ -29,12 +29,11 @@ import ( ) // pushQueue represents a queue to handle update pull request tests -var pushQueue queue.Queue +var pushQueue *queue.WorkerPoolQueue[[]*repo_module.PushUpdateOptions] // handle passed PR IDs and test the PRs -func handle(data ...queue.Data) []queue.Data { - for _, datum := range data { - opts := datum.([]*repo_module.PushUpdateOptions) +func handler(items ...[]*repo_module.PushUpdateOptions) [][]*repo_module.PushUpdateOptions { + for _, opts := range items { if err := pushUpdates(opts); err != nil { log.Error("pushUpdate failed: %v", err) } @@ -43,7 +42,7 @@ func handle(data ...queue.Data) []queue.Data { } func initPushQueue() error { - pushQueue = queue.CreateQueue("push_update", handle, []*repo_module.PushUpdateOptions{}) + pushQueue = queue.CreateSimpleQueue("push_update", handler) if pushQueue == nil { return errors.New("unable to create push_update Queue") } -- cgit v1.2.3