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When resolving snapshotIDs in FindFilteredSnapshots either FindLatestSnapshot or FindSnapshot is called. Both operations issue a list operation to the backend. When for example passing a long list of snapshot ids to `forget` this could lead to a large number of list operations.
83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
package main
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import (
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"context"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/restic"
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)
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// FindFilteredSnapshots yields Snapshots, either given explicitly by `snapshotIDs` or filtered from the list of all snapshots.
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func FindFilteredSnapshots(ctx context.Context, be restic.Lister, loader restic.LoadJSONUnpackeder, hosts []string, tags []restic.TagList, paths []string, snapshotIDs []string) <-chan *restic.Snapshot {
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out := make(chan *restic.Snapshot)
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go func() {
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defer close(out)
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if len(snapshotIDs) != 0 {
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// memorize snapshots list to prevent repeated backend listings
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be, err := backend.MemorizeList(ctx, be, restic.SnapshotFile)
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if err != nil {
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Warnf("could not load snapshots: %v\n", err)
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return
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}
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var (
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id restic.ID
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usedFilter bool
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)
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ids := make(restic.IDs, 0, len(snapshotIDs))
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// Process all snapshot IDs given as arguments.
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for _, s := range snapshotIDs {
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if s == "latest" {
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usedFilter = true
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id, err = restic.FindLatestSnapshot(ctx, be, loader, paths, tags, hosts, nil)
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if err != nil {
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Warnf("Ignoring %q, no snapshot matched given filter (Paths:%v Tags:%v Hosts:%v)\n", s, paths, tags, hosts)
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continue
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}
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} else {
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id, err = restic.FindSnapshot(ctx, be, s)
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if err != nil {
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Warnf("Ignoring %q: %v\n", s, err)
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continue
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}
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}
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ids = append(ids, id)
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}
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// Give the user some indication their filters are not used.
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if !usedFilter && (len(hosts) != 0 || len(tags) != 0 || len(paths) != 0) {
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Warnf("Ignoring filters as there are explicit snapshot ids given\n")
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}
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for _, id := range ids.Uniq() {
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sn, err := restic.LoadSnapshot(ctx, loader, id)
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if err != nil {
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Warnf("Ignoring %q, could not load snapshot: %v\n", id, err)
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continue
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}
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select {
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case <-ctx.Done():
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return
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case out <- sn:
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}
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}
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return
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}
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snapshots, err := restic.FindFilteredSnapshots(ctx, be, loader, hosts, tags, paths)
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if err != nil {
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Warnf("could not load snapshots: %v\n", err)
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return
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}
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for _, sn := range snapshots {
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select {
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case <-ctx.Done():
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return
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case out <- sn:
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}
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}
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}()
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return out
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}
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