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Wrap the code indexer (#9476)
* Wrap the code indexer In order to prevent a data race in the code indexer it must be wrapped with a holder otherwise it is possible to Search/Index on an incompletely initialised indexer, and search will fail with a nil pointer until the repository indexer is initialised. Further a completely initialised repository indexer should not be closed until Termination otherwise actions in Hammer/Shutdown phases could block or be lost. Finally, there is a complex dance of shutdown etiquette should the index initialisation fail. This PR restores that. * Always return err if closed whilst waiting Co-authored-by: techknowlogick <matti@mdranta.net>
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34688e1db3
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@ -5,6 +5,8 @@
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package code
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import (
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"context"
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"os"
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"time"
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"code.gitea.io/gitea/modules/graceful"
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@ -12,10 +14,6 @@ import (
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"code.gitea.io/gitea/modules/setting"
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)
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var (
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indexer Indexer
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)
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// SearchResult result of performing a search in a repo
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type SearchResult struct {
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RepoID int64
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@ -36,28 +34,45 @@ type Indexer interface {
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// Init initialize the repo indexer
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func Init() {
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if !setting.Indexer.RepoIndexerEnabled {
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indexer.Close()
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return
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}
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ctx, cancel := context.WithCancel(context.Background())
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graceful.GetManager().RunAtTerminate(ctx, func() {
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log.Debug("Closing repository indexer")
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indexer.Close()
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log.Info("PID: %d Repository Indexer closed", os.Getpid())
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})
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waitChannel := make(chan time.Duration)
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go func() {
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start := time.Now()
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log.Info("Initializing Repository Indexer")
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var created bool
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var err error
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indexer, created, err = NewBleveIndexer(setting.Indexer.RepoPath)
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log.Info("PID: %d Initializing Repository Indexer at: %s", os.Getpid(), setting.Indexer.RepoPath)
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bleveIndexer, created, err := NewBleveIndexer(setting.Indexer.RepoPath)
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if err != nil {
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if bleveIndexer != nil {
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bleveIndexer.Close()
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}
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cancel()
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indexer.Close()
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log.Fatal("indexer.Init: %v", err)
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close(waitChannel)
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log.Fatal("PID: %d Unable to initialize the Repository Indexer at path: %s Error: %v", os.Getpid(), setting.Indexer.RepoPath, err)
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}
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indexer.set(bleveIndexer)
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go processRepoIndexerOperationQueue(indexer)
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if created {
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go populateRepoIndexer()
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}
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select {
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case waitChannel <- time.Since(start):
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case <-graceful.GetManager().IsShutdown():
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}
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waitChannel <- time.Since(start)
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close(waitChannel)
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}()
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if setting.Indexer.StartupTimeout > 0 {
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@ -67,9 +82,21 @@ func Init() {
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timeout += setting.GracefulHammerTime
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}
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select {
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case duration := <-waitChannel:
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case <-graceful.GetManager().IsShutdown():
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log.Warn("Shutdown before Repository Indexer completed initialization")
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cancel()
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indexer.Close()
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case duration, ok := <-waitChannel:
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if !ok {
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log.Warn("Repository Indexer Initialization failed")
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cancel()
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indexer.Close()
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return
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}
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log.Info("Repository Indexer Initialization took %v", duration)
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case <-time.After(timeout):
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cancel()
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indexer.Close()
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log.Fatal("Repository Indexer Initialization Timed-Out after: %v", timeout)
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}
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}()
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@ -22,8 +22,6 @@ type repoIndexerOperation struct {
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var repoIndexerOperationQueue chan repoIndexerOperation
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func processRepoIndexerOperationQueue(indexer Indexer) {
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defer indexer.Close()
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repoIndexerOperationQueue = make(chan repoIndexerOperation, setting.Indexer.UpdateQueueLength)
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for {
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select {
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94
modules/indexer/code/wrapped.go
Normal file
94
modules/indexer/code/wrapped.go
Normal file
@ -0,0 +1,94 @@
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package code
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import (
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"fmt"
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"sync"
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)
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var (
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indexer = newWrappedIndexer()
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)
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// ErrWrappedIndexerClosed is the error returned if the indexer was closed before it was ready
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var ErrWrappedIndexerClosed = fmt.Errorf("Indexer closed before ready")
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type wrappedIndexer struct {
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internal Indexer
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lock sync.RWMutex
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cond *sync.Cond
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closed bool
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}
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func newWrappedIndexer() *wrappedIndexer {
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w := &wrappedIndexer{}
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w.cond = sync.NewCond(w.lock.RLocker())
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return w
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}
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func (w *wrappedIndexer) set(indexer Indexer) {
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w.lock.Lock()
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defer w.lock.Unlock()
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if w.closed {
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// Too late!
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indexer.Close()
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}
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w.internal = indexer
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w.cond.Broadcast()
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}
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func (w *wrappedIndexer) get() (Indexer, error) {
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w.lock.RLock()
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defer w.lock.RUnlock()
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if w.internal == nil {
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if w.closed {
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return nil, ErrWrappedIndexerClosed
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}
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w.cond.Wait()
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if w.closed {
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return nil, ErrWrappedIndexerClosed
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}
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}
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return w.internal, nil
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}
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func (w *wrappedIndexer) Index(repoID int64) error {
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indexer, err := w.get()
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if err != nil {
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return err
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}
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return indexer.Index(repoID)
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}
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func (w *wrappedIndexer) Delete(repoID int64) error {
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indexer, err := w.get()
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if err != nil {
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return err
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}
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return indexer.Delete(repoID)
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}
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func (w *wrappedIndexer) Search(repoIDs []int64, keyword string, page, pageSize int) (int64, []*SearchResult, error) {
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indexer, err := w.get()
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if err != nil {
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return 0, nil, err
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}
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return indexer.Search(repoIDs, keyword, page, pageSize)
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}
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func (w *wrappedIndexer) Close() {
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w.lock.Lock()
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defer w.lock.Unlock()
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if w.closed {
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return
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}
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w.closed = true
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w.cond.Broadcast()
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if w.internal != nil {
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w.internal.Close()
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}
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}
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