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2e0f1f5113
This removes RunWorkers, which had become mere overhead by successive refactors. It also ensures that each former user of that function returns any context error that occurs, so failure to complete an operation is always reported as an error.
78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
package repository
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import (
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"context"
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"sync"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/restic"
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"golang.org/x/sync/errgroup"
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)
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const loadIndexParallelism = 5
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// ForAllIndexes loads all index files in parallel and calls the given callback.
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// It is guaranteed that the function is not run concurrently. If the callback
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// returns an error, this function is cancelled and also returns that error.
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func ForAllIndexes(ctx context.Context, repo restic.Repository,
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fn func(id restic.ID, index *Index, oldFormat bool, err error) error) error {
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debug.Log("Start")
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type FileInfo struct {
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restic.ID
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Size int64
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}
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var m sync.Mutex
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// track spawned goroutines using wg, create a new context which is
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// cancelled as soon as an error occurs.
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wg, ctx := errgroup.WithContext(ctx)
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ch := make(chan FileInfo)
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// send list of index files through ch, which is closed afterwards
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wg.Go(func() error {
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defer close(ch)
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return repo.List(ctx, restic.IndexFile, func(id restic.ID, size int64) error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case ch <- FileInfo{id, size}:
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}
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return nil
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})
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})
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// a worker receives an index ID from ch, loads the index, and sends it to indexCh
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worker := func() error {
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var buf []byte
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for fi := range ch {
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debug.Log("worker got file %v", fi.ID.Str())
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var err error
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var idx *Index
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oldFormat := false
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buf, err = repo.LoadUnpacked(ctx, buf[:0], restic.IndexFile, fi.ID)
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if err == nil {
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idx, oldFormat, err = DecodeIndex(buf, fi.ID)
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}
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m.Lock()
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err = fn(fi.ID, idx, oldFormat, err)
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m.Unlock()
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if err != nil {
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return err
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}
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}
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return nil
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}
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// run workers on ch
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for i := 0; i < loadIndexParallelism; i++ {
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wg.Go(worker)
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}
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return wg.Wait()
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}
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