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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: ![image](https://user-images.githubusercontent.com/2114189/236620635-55576955-f95d-4810-b12f-879026a3afdf.png)
133 lines
3.7 KiB
Go
133 lines
3.7 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package test
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import (
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scontext "context"
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"io"
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"net/http"
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"net/http/httptest"
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"net/url"
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"testing"
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access_model "code.gitea.io/gitea/models/perm/access"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/models/unittest"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/templates"
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"code.gitea.io/gitea/modules/translation"
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"code.gitea.io/gitea/modules/web/middleware"
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chi "github.com/go-chi/chi/v5"
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"github.com/stretchr/testify/assert"
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)
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// MockContext mock context for unit tests
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// TODO: move this function to other packages, because it depends on "models" package
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func MockContext(t *testing.T, path string) *context.Context {
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resp := &mockResponseWriter{}
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ctx := context.Context{
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Render: &mockRender{},
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Data: make(middleware.ContextData),
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Flash: &middleware.Flash{
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Values: make(url.Values),
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},
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Resp: context.NewResponse(resp),
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Locale: &translation.MockLocale{},
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}
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defer ctx.Close()
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requestURL, err := url.Parse(path)
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assert.NoError(t, err)
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req := &http.Request{
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URL: requestURL,
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Form: url.Values{},
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}
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chiCtx := chi.NewRouteContext()
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req = req.WithContext(scontext.WithValue(req.Context(), chi.RouteCtxKey, chiCtx))
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ctx.Req = context.WithContext(req, &ctx)
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return &ctx
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}
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// LoadRepo load a repo into a test context.
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func LoadRepo(t *testing.T, ctx *context.Context, repoID int64) {
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ctx.Repo = &context.Repository{}
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ctx.Repo.Repository = unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: repoID})
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var err error
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ctx.Repo.Owner, err = user_model.GetUserByID(ctx, ctx.Repo.Repository.OwnerID)
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assert.NoError(t, err)
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ctx.Repo.RepoLink = ctx.Repo.Repository.Link()
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ctx.Repo.Permission, err = access_model.GetUserRepoPermission(ctx, ctx.Repo.Repository, ctx.Doer)
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assert.NoError(t, err)
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}
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// LoadRepoCommit loads a repo's commit into a test context.
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func LoadRepoCommit(t *testing.T, ctx *context.Context) {
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gitRepo, err := git.OpenRepository(ctx, ctx.Repo.Repository.RepoPath())
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assert.NoError(t, err)
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defer gitRepo.Close()
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branch, err := gitRepo.GetHEADBranch()
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assert.NoError(t, err)
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assert.NotNil(t, branch)
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if branch != nil {
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ctx.Repo.Commit, err = gitRepo.GetBranchCommit(branch.Name)
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assert.NoError(t, err)
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}
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}
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// LoadUser load a user into a test context.
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func LoadUser(t *testing.T, ctx *context.Context, userID int64) {
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ctx.Doer = unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: userID})
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}
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// LoadGitRepo load a git repo into a test context. Requires that ctx.Repo has
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// already been populated.
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func LoadGitRepo(t *testing.T, ctx *context.Context) {
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assert.NoError(t, ctx.Repo.Repository.LoadOwner(ctx))
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var err error
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ctx.Repo.GitRepo, err = git.OpenRepository(ctx, ctx.Repo.Repository.RepoPath())
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assert.NoError(t, err)
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}
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type mockResponseWriter struct {
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httptest.ResponseRecorder
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size int
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}
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func (rw *mockResponseWriter) Write(b []byte) (int, error) {
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rw.size += len(b)
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return rw.ResponseRecorder.Write(b)
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}
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func (rw *mockResponseWriter) Status() int {
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return rw.ResponseRecorder.Code
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}
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func (rw *mockResponseWriter) Written() bool {
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return rw.ResponseRecorder.Code > 0
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}
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func (rw *mockResponseWriter) Size() int {
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return rw.size
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}
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func (rw *mockResponseWriter) Push(target string, opts *http.PushOptions) error {
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return nil
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}
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type mockRender struct{}
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func (tr *mockRender) TemplateLookup(tmpl string) (templates.TemplateExecutor, error) {
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return nil, nil
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}
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func (tr *mockRender) HTML(w io.Writer, status int, _ string, _ interface{}) error {
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if resp, ok := w.(http.ResponseWriter); ok {
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resp.WriteHeader(status)
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}
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return nil
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}
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