forgejo/models/unittest/testdb.go
wxiaoguang 6f9c278559
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 19:49:59 +08:00

253 lines
8 KiB
Go

// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package unittest
import (
"context"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"testing"
"code.gitea.io/gitea/models/db"
system_model "code.gitea.io/gitea/models/system"
"code.gitea.io/gitea/modules/auth/password/hash"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/storage"
"code.gitea.io/gitea/modules/util"
"github.com/stretchr/testify/assert"
"xorm.io/xorm"
"xorm.io/xorm/names"
)
// giteaRoot a path to the gitea root
var (
giteaRoot string
fixturesDir string
)
// FixturesDir returns the fixture directory
func FixturesDir() string {
return fixturesDir
}
func fatalTestError(fmtStr string, args ...interface{}) {
_, _ = fmt.Fprintf(os.Stderr, fmtStr, args...)
os.Exit(1)
}
// InitSettings initializes config provider and load common setttings for tests
func InitSettings(extraConfigs ...string) {
setting.Init(&setting.Options{
AllowEmpty: true,
ExtraConfig: strings.Join(extraConfigs, "\n"),
})
if err := setting.PrepareAppDataPath(); err != nil {
log.Fatalf("Can not prepare APP_DATA_PATH: %v", err)
}
// register the dummy hash algorithm function used in the test fixtures
_ = hash.Register("dummy", hash.NewDummyHasher)
setting.PasswordHashAlgo, _ = hash.SetDefaultPasswordHashAlgorithm("dummy")
}
// TestOptions represents test options
type TestOptions struct {
GiteaRootPath string
FixtureFiles []string
SetUp func() error // SetUp will be executed before all tests in this package
TearDown func() error // TearDown will be executed after all tests in this package
}
// MainTest a reusable TestMain(..) function for unit tests that need to use a
// test database. Creates the test database, and sets necessary settings.
func MainTest(m *testing.M, testOpts *TestOptions) {
setting.SetCustomPathAndConf("", "", "")
InitSettings()
var err error
giteaRoot = testOpts.GiteaRootPath
fixturesDir = filepath.Join(testOpts.GiteaRootPath, "models", "fixtures")
var opts FixturesOptions
if len(testOpts.FixtureFiles) == 0 {
opts.Dir = fixturesDir
} else {
for _, f := range testOpts.FixtureFiles {
if len(f) != 0 {
opts.Files = append(opts.Files, filepath.Join(fixturesDir, f))
}
}
}
if err = CreateTestEngine(opts); err != nil {
fatalTestError("Error creating test engine: %v\n", err)
}
setting.AppURL = "https://try.gitea.io/"
setting.RunUser = "runuser"
setting.SSH.User = "sshuser"
setting.SSH.BuiltinServerUser = "builtinuser"
setting.SSH.Port = 3000
setting.SSH.Domain = "try.gitea.io"
setting.Database.Type = "sqlite3"
setting.Repository.DefaultBranch = "master" // many test code still assume that default branch is called "master"
repoRootPath, err := os.MkdirTemp(os.TempDir(), "repos")
if err != nil {
fatalTestError("TempDir: %v\n", err)
}
setting.RepoRootPath = repoRootPath
appDataPath, err := os.MkdirTemp(os.TempDir(), "appdata")
if err != nil {
fatalTestError("TempDir: %v\n", err)
}
setting.AppDataPath = appDataPath
setting.AppWorkPath = testOpts.GiteaRootPath
setting.StaticRootPath = testOpts.GiteaRootPath
setting.GravatarSource = "https://secure.gravatar.com/avatar/"
setting.Attachment.Storage.Path = filepath.Join(setting.AppDataPath, "attachments")
setting.LFS.Storage.Path = filepath.Join(setting.AppDataPath, "lfs")
setting.Avatar.Storage.Path = filepath.Join(setting.AppDataPath, "avatars")
setting.RepoAvatar.Storage.Path = filepath.Join(setting.AppDataPath, "repo-avatars")
setting.RepoArchive.Storage.Path = filepath.Join(setting.AppDataPath, "repo-archive")
setting.Packages.Storage.Path = filepath.Join(setting.AppDataPath, "packages")
setting.Actions.Storage.Path = filepath.Join(setting.AppDataPath, "actions_log")
setting.Git.HomePath = filepath.Join(setting.AppDataPath, "home")
setting.IncomingEmail.ReplyToAddress = "incoming+%{token}@localhost"
if err = storage.Init(); err != nil {
fatalTestError("storage.Init: %v\n", err)
}
if err = system_model.Init(db.DefaultContext); err != nil {
fatalTestError("models.Init: %v\n", err)
}
if err = util.RemoveAll(repoRootPath); err != nil {
fatalTestError("util.RemoveAll: %v\n", err)
}
if err = CopyDir(filepath.Join(testOpts.GiteaRootPath, "tests", "gitea-repositories-meta"), setting.RepoRootPath); err != nil {
fatalTestError("util.CopyDir: %v\n", err)
}
if err = git.InitFull(context.Background()); err != nil {
fatalTestError("git.Init: %v\n", err)
}
ownerDirs, err := os.ReadDir(setting.RepoRootPath)
if err != nil {
fatalTestError("unable to read the new repo root: %v\n", err)
}
for _, ownerDir := range ownerDirs {
if !ownerDir.Type().IsDir() {
continue
}
repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
if err != nil {
fatalTestError("unable to read the new repo root: %v\n", err)
}
for _, repoDir := range repoDirs {
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0o755)
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0o755)
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0o755)
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0o755)
}
}
if testOpts.SetUp != nil {
if err := testOpts.SetUp(); err != nil {
fatalTestError("set up failed: %v\n", err)
}
}
exitStatus := m.Run()
if testOpts.TearDown != nil {
if err := testOpts.TearDown(); err != nil {
fatalTestError("tear down failed: %v\n", err)
}
}
if err = util.RemoveAll(repoRootPath); err != nil {
fatalTestError("util.RemoveAll: %v\n", err)
}
if err = util.RemoveAll(appDataPath); err != nil {
fatalTestError("util.RemoveAll: %v\n", err)
}
os.Exit(exitStatus)
}
// FixturesOptions fixtures needs to be loaded options
type FixturesOptions struct {
Dir string
Files []string
}
// CreateTestEngine creates a memory database and loads the fixture data from fixturesDir
func CreateTestEngine(opts FixturesOptions) error {
x, err := xorm.NewEngine("sqlite3", "file::memory:?cache=shared&_txlock=immediate")
if err != nil {
if strings.Contains(err.Error(), "unknown driver") {
return fmt.Errorf(`sqlite3 requires: import _ "github.com/mattn/go-sqlite3" or -tags sqlite,sqlite_unlock_notify%s%w`, "\n", err)
}
return err
}
x.SetMapper(names.GonicMapper{})
db.SetDefaultEngine(context.Background(), x)
if err = db.SyncAllTables(); err != nil {
return err
}
switch os.Getenv("GITEA_UNIT_TESTS_LOG_SQL") {
case "true", "1":
x.ShowSQL(true)
}
return InitFixtures(opts)
}
// PrepareTestDatabase load test fixtures into test database
func PrepareTestDatabase() error {
return LoadFixtures()
}
// PrepareTestEnv prepares the environment for unit tests. Can only be called
// by tests that use the above MainTest(..) function.
func PrepareTestEnv(t testing.TB) {
assert.NoError(t, PrepareTestDatabase())
assert.NoError(t, util.RemoveAll(setting.RepoRootPath))
metaPath := filepath.Join(giteaRoot, "tests", "gitea-repositories-meta")
assert.NoError(t, CopyDir(metaPath, setting.RepoRootPath))
ownerDirs, err := os.ReadDir(setting.RepoRootPath)
assert.NoError(t, err)
for _, ownerDir := range ownerDirs {
if !ownerDir.Type().IsDir() {
continue
}
repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
assert.NoError(t, err)
for _, repoDir := range repoDirs {
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0o755)
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0o755)
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0o755)
_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0o755)
}
}
base.SetupGiteaRoot() // Makes sure GITEA_ROOT is set
}