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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)
182 lines
5.2 KiB
Go
182 lines
5.2 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package setting
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/util"
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ini "gopkg.in/ini.v1"
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)
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type ConfigSection interface {
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Name() string
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MapTo(interface{}) error
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HasKey(key string) bool
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NewKey(name, value string) (*ini.Key, error)
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Key(key string) *ini.Key
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Keys() []*ini.Key
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ChildSections() []*ini.Section
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}
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// ConfigProvider represents a config provider
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type ConfigProvider interface {
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Section(section string) ConfigSection
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NewSection(name string) (ConfigSection, error)
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GetSection(name string) (ConfigSection, error)
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DeleteSection(name string) error
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Save() error
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}
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type iniFileConfigProvider struct {
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opts *Options
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*ini.File
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newFile bool // whether the file has not existed previously
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}
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// NewEmptyConfigProvider create a new empty config provider
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func NewEmptyConfigProvider() ConfigProvider {
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cp, _ := NewConfigProviderFromData("")
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return cp
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}
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// NewConfigProviderFromData this function is only for testing
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func NewConfigProviderFromData(configContent string) (ConfigProvider, error) {
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var cfg *ini.File
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var err error
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if configContent == "" {
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cfg = ini.Empty()
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} else {
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cfg, err = ini.Load(strings.NewReader(configContent))
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if err != nil {
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return nil, err
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}
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}
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cfg.NameMapper = ini.SnackCase
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return &iniFileConfigProvider{
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File: cfg,
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newFile: true,
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}, nil
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}
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type Options struct {
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CustomConf string // the ini file path
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AllowEmpty bool // whether not finding configuration files is allowed (only true for the tests)
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ExtraConfig string
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DisableLoadCommonSettings bool
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}
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// newConfigProviderFromFile load configuration from file.
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// NOTE: do not print any log except error.
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func newConfigProviderFromFile(opts *Options) (*iniFileConfigProvider, error) {
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cfg := ini.Empty()
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newFile := true
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if opts.CustomConf != "" {
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isFile, err := util.IsFile(opts.CustomConf)
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if err != nil {
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return nil, fmt.Errorf("unable to check if %s is a file. Error: %v", opts.CustomConf, err)
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}
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if isFile {
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if err := cfg.Append(opts.CustomConf); err != nil {
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return nil, fmt.Errorf("failed to load custom conf '%s': %v", opts.CustomConf, err)
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}
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newFile = false
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}
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}
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if newFile && !opts.AllowEmpty {
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return nil, fmt.Errorf("unable to find configuration file: %q, please ensure you are running in the correct environment or set the correct configuration file with -c", CustomConf)
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}
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if opts.ExtraConfig != "" {
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if err := cfg.Append([]byte(opts.ExtraConfig)); err != nil {
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return nil, fmt.Errorf("unable to append more config: %v", err)
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}
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}
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cfg.NameMapper = ini.SnackCase
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return &iniFileConfigProvider{
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opts: opts,
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File: cfg,
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newFile: newFile,
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}, nil
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}
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func (p *iniFileConfigProvider) Section(section string) ConfigSection {
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return p.File.Section(section)
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}
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func (p *iniFileConfigProvider) NewSection(name string) (ConfigSection, error) {
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return p.File.NewSection(name)
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}
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func (p *iniFileConfigProvider) GetSection(name string) (ConfigSection, error) {
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return p.File.GetSection(name)
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}
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func (p *iniFileConfigProvider) DeleteSection(name string) error {
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p.File.DeleteSection(name)
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return nil
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}
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// Save save the content into file
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func (p *iniFileConfigProvider) Save() error {
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if p.opts.CustomConf == "" {
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if !p.opts.AllowEmpty {
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return fmt.Errorf("custom config path must not be empty")
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}
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return nil
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}
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if p.newFile {
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if err := os.MkdirAll(filepath.Dir(CustomConf), os.ModePerm); err != nil {
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return fmt.Errorf("failed to create '%s': %v", CustomConf, err)
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}
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}
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if err := p.SaveTo(p.opts.CustomConf); err != nil {
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return fmt.Errorf("failed to save '%s': %v", p.opts.CustomConf, err)
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}
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// Change permissions to be more restrictive
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fi, err := os.Stat(CustomConf)
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if err != nil {
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return fmt.Errorf("failed to determine current conf file permissions: %v", err)
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}
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if fi.Mode().Perm() > 0o600 {
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if err = os.Chmod(CustomConf, 0o600); err != nil {
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log.Warn("Failed changing conf file permissions to -rw-------. Consider changing them manually.")
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}
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}
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return nil
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}
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// a file is an implementation ConfigProvider and other implementations are possible, i.e. from docker, k8s, …
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var _ ConfigProvider = &iniFileConfigProvider{}
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func mustMapSetting(rootCfg ConfigProvider, sectionName string, setting interface{}) {
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if err := rootCfg.Section(sectionName).MapTo(setting); err != nil {
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log.Fatal("Failed to map %s settings: %v", sectionName, err)
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}
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}
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func deprecatedSetting(rootCfg ConfigProvider, oldSection, oldKey, newSection, newKey, version string) {
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if rootCfg.Section(oldSection).HasKey(oldKey) {
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log.Error("Deprecated fallback `[%s]` `%s` present. Use `[%s]` `%s` instead. This fallback will be/has been removed in %s", oldSection, oldKey, newSection, newKey, version)
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}
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}
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// deprecatedSettingDB add a hint that the configuration has been moved to database but still kept in app.ini
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func deprecatedSettingDB(rootCfg ConfigProvider, oldSection, oldKey string) {
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if rootCfg.Section(oldSection).HasKey(oldKey) {
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log.Error("Deprecated `[%s]` `%s` present which has been copied to database table sys_setting", oldSection, oldKey)
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}
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}
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