forked from TrueCloudLab/restic
76 lines
1.7 KiB
Go
76 lines
1.7 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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)
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// ParallelWorkFunc gets one file ID to work on. If an error is returned,
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// processing stops. When the contect is cancelled the function should return.
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type ParallelWorkFunc func(ctx context.Context, id string) error
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// ParallelIDWorkFunc gets one restic.ID to work on. If an error is returned,
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// processing stops. When the context is cancelled the function should return.
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type ParallelIDWorkFunc func(ctx context.Context, id restic.ID) error
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// FilesInParallel runs n workers of f in parallel, on the IDs that
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// repo.List(t) yield. If f returns an error, the process is aborted and the
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// first error is returned.
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func FilesInParallel(ctx context.Context, repo restic.Lister, t restic.FileType, n uint, f ParallelWorkFunc) error {
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wg := &sync.WaitGroup{}
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ch := repo.List(ctx, t)
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errors := make(chan error, n)
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for i := 0; uint(i) < n; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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select {
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case id, ok := <-ch:
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if !ok {
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return
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}
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err := f(ctx, id)
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if err != nil {
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errors <- err
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return
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}
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case <-ctx.Done():
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return
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}
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}
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}()
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}
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wg.Wait()
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select {
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case err := <-errors:
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return err
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default:
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break
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}
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return nil
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}
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// ParallelWorkFuncParseID converts a function that takes a restic.ID to a
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// function that takes a string. Filenames that do not parse as a restic.ID
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// are ignored.
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func ParallelWorkFuncParseID(f ParallelIDWorkFunc) ParallelWorkFunc {
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return func(ctx context.Context, s string) error {
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id, err := restic.ParseID(s)
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if err != nil {
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debug.Log("invalid ID %q: %v", id, err)
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return err
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}
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return f(ctx, id)
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}
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}
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