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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: 
125 lines
4 KiB
Go
125 lines
4 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package queue
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import (
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"context"
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"path/filepath"
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"testing"
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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 TestManager(t *testing.T) {
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oldAppDataPath := setting.AppDataPath
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setting.AppDataPath = t.TempDir()
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defer func() {
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setting.AppDataPath = oldAppDataPath
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}()
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newQueueFromConfig := func(name, cfg string) (*WorkerPoolQueue[int], error) {
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cfgProvider, err := setting.NewConfigProviderFromData(cfg)
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if err != nil {
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return nil, err
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}
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qs, err := setting.GetQueueSettings(cfgProvider, name)
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if err != nil {
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return nil, err
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}
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return NewWorkerPoolQueueBySetting(name, qs, func(s ...int) (unhandled []int) { return nil }, false)
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}
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// test invalid CONN_STR
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_, err := newQueueFromConfig("default", `
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[queue]
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DATADIR = temp-dir
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CONN_STR = redis://
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`)
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assert.ErrorContains(t, err, "invalid leveldb connection string")
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// test default config
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q, err := newQueueFromConfig("default", "")
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assert.NoError(t, err)
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assert.Equal(t, "default", q.GetName())
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assert.Equal(t, "level", q.GetType())
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assert.Equal(t, filepath.Join(setting.AppDataPath, "queues/common"), q.baseConfig.DataFullDir)
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assert.Equal(t, 100, q.baseConfig.Length)
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assert.Equal(t, 20, q.batchLength)
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assert.Equal(t, "", q.baseConfig.ConnStr)
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assert.Equal(t, "default_queue", q.baseConfig.QueueFullName)
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assert.Equal(t, "default_queue_unique", q.baseConfig.SetFullName)
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assert.Equal(t, 10, q.GetWorkerMaxNumber())
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assert.Equal(t, 0, q.GetWorkerNumber())
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assert.Equal(t, 0, q.GetWorkerActiveNumber())
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assert.Equal(t, 0, q.GetQueueItemNumber())
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assert.Equal(t, "int", q.GetItemTypeName())
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// test inherited config
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cfgProvider, err := setting.NewConfigProviderFromData(`
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[queue]
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TYPE = channel
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DATADIR = queues/dir1
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LENGTH = 100
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BATCH_LENGTH = 20
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CONN_STR = "addrs=127.0.0.1:6379 db=0"
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QUEUE_NAME = _queue1
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[queue.sub]
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TYPE = level
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DATADIR = queues/dir2
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LENGTH = 102
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BATCH_LENGTH = 22
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CONN_STR =
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QUEUE_NAME = _q2
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SET_NAME = _u2
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MAX_WORKERS = 2
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`)
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assert.NoError(t, err)
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q1 := createWorkerPoolQueue[string]("no-such", cfgProvider, nil, false)
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assert.Equal(t, "no-such", q1.GetName())
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assert.Equal(t, "dummy", q1.GetType()) // no handler, so it becomes dummy
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assert.Equal(t, filepath.Join(setting.AppDataPath, "queues/dir1"), q1.baseConfig.DataFullDir)
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assert.Equal(t, 100, q1.baseConfig.Length)
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assert.Equal(t, 20, q1.batchLength)
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assert.Equal(t, "addrs=127.0.0.1:6379 db=0", q1.baseConfig.ConnStr)
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assert.Equal(t, "no-such_queue1", q1.baseConfig.QueueFullName)
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assert.Equal(t, "no-such_queue1_unique", q1.baseConfig.SetFullName)
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assert.Equal(t, 10, q1.GetWorkerMaxNumber())
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assert.Equal(t, 0, q1.GetWorkerNumber())
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assert.Equal(t, 0, q1.GetWorkerActiveNumber())
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assert.Equal(t, 0, q1.GetQueueItemNumber())
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assert.Equal(t, "string", q1.GetItemTypeName())
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qid1 := GetManager().qidCounter
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q2 := createWorkerPoolQueue("sub", cfgProvider, func(s ...int) (unhandled []int) { return nil }, false)
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assert.Equal(t, "sub", q2.GetName())
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assert.Equal(t, "level", q2.GetType())
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assert.Equal(t, filepath.Join(setting.AppDataPath, "queues/dir2"), q2.baseConfig.DataFullDir)
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assert.Equal(t, 102, q2.baseConfig.Length)
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assert.Equal(t, 22, q2.batchLength)
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assert.Equal(t, "", q2.baseConfig.ConnStr)
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assert.Equal(t, "sub_q2", q2.baseConfig.QueueFullName)
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assert.Equal(t, "sub_q2_u2", q2.baseConfig.SetFullName)
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assert.Equal(t, 2, q2.GetWorkerMaxNumber())
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assert.Equal(t, 0, q2.GetWorkerNumber())
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assert.Equal(t, 0, q2.GetWorkerActiveNumber())
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assert.Equal(t, 0, q2.GetQueueItemNumber())
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assert.Equal(t, "int", q2.GetItemTypeName())
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qid2 := GetManager().qidCounter
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assert.Equal(t, q1, GetManager().ManagedQueues()[qid1])
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GetManager().GetManagedQueue(qid1).SetWorkerMaxNumber(120)
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assert.Equal(t, 120, q1.workerMaxNum)
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stop := runWorkerPoolQueue(q2)
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assert.NoError(t, GetManager().GetManagedQueue(qid2).FlushWithContext(context.Background(), 0))
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assert.NoError(t, GetManager().FlushAll(context.Background(), 0))
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stop()
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}
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