package index import ( "context" "runtime" "sync" "github.com/restic/restic/internal/restic" ) // ForAllIndexes loads all index files in parallel and calls the given callback. // It is guaranteed that the function is not run concurrently. If the callback // returns an error, this function is cancelled and also returns that error. func ForAllIndexes(ctx context.Context, lister restic.Lister, repo restic.LoaderUnpacked, fn func(id restic.ID, index *Index, oldFormat bool, err error) error) error { // decoding an index can take quite some time such that this can be both CPU- or IO-bound // as the whole index is kept in memory anyways, a few workers too much don't matter workerCount := repo.Connections() + uint(runtime.GOMAXPROCS(0)) var m sync.Mutex return restic.ParallelList(ctx, lister, restic.IndexFile, workerCount, func(ctx context.Context, id restic.ID, _ int64) error { var err error var idx *Index oldFormat := false buf, err := repo.LoadUnpacked(ctx, restic.IndexFile, id) if err == nil { idx, oldFormat, err = DecodeIndex(buf, id) } m.Lock() defer m.Unlock() return fn(id, idx, oldFormat, err) }) }