zeroshade commented on code in PR #401:
URL: https://github.com/apache/iceberg-go/pull/401#discussion_r2096038254
##########
table/transaction.go:
##########
@@ -142,6 +143,120 @@ func (t *Transaction) SetProperties(props
iceberg.Properties) error {
return nil
}
+type expireSnapshotsCfg struct {
+ minSnapshotsToKeep *int
+ maxSnapshotAgeMs *int64
+}
+
+type ExpireSnapshotsOpt func(*expireSnapshotsCfg)
+
+func WithRetainLast(n int) ExpireSnapshotsOpt {
+ return func(cfg *expireSnapshotsCfg) {
+ cfg.minSnapshotsToKeep = &n
+ }
+}
+
+func WithOlderThan(t time.Duration) ExpireSnapshotsOpt {
+ return func(cfg *expireSnapshotsCfg) {
+ n := t.Milliseconds()
+ cfg.maxSnapshotAgeMs = &n
+ }
+}
+
+func (t *Transaction) ExpireSnapshots(opts ...ExpireSnapshotsOpt) error {
+ var (
+ cfg expireSnapshotsCfg
+ updates []Update
+ snapsToKeep = make(map[int64]struct{})
+ refsToDelete = make(map[string]struct{})
+ )
+
+ for _, opt := range opts {
+ opt(&cfg)
+ }
+
+ for refName, ref := range t.meta.refs {
+ if refName == MainBranch {
+ continue
+ }
+
+ snap, err := t.meta.SnapshotByID(ref.SnapshotID)
+ if err != nil {
+ return err
+ }
+
+ maxRefAgeMs := internal.Coalesce(ref.MaxRefAgeMs,
cfg.maxSnapshotAgeMs)
+ if maxRefAgeMs == nil {
+ return errors.New("cannot find a valid value for
maxRefAgeMs")
+ }
+
+ refAge := time.Now().UnixMilli() - snap.TimestampMs
+ if refAge > *maxRefAgeMs {
+ updates = append(updates,
NewRemoveSnapshotRefUpdate(refName))
+ refsToDelete[refName] = struct{}{}
+ }
Review Comment:
extract `time.Now().UnixMilli()` from the loop instead of calling it
repeatedly. Stick it in the var block at the top of this function.
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