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30181d459d
* 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>
95 lines
1.8 KiB
Go
95 lines
1.8 KiB
Go
// 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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