snapshot of https://github.com/seaweedfs/seaweedfs.git (master, 2026-09-16; blobs > 131072B omitted)

weed/s3api/s3lifecycle/version_time.go

@@ -0,0 +1,76 @@
+package s3lifecycle
+
+import (
+	"strconv"
+)
+
+// versionIdFormatThreshold distinguishes old vs new format version IDs.
+// New format (inverted timestamps) produces values above this threshold;
+// old format (raw timestamps) produces values below it.
+const versionIdFormatThreshold = 0x4000000000000000
+
+// CompareVersionIds returns negative if a is newer than b, positive if b
+// is newer, 0 if equal. Mirrors compareVersionIds in s3api_version_id.go
+// (kept duplicated to avoid the s3api -> s3lifecycle import cycle). Used
+// as a tiebreak when version mtimes collide at second resolution.
+func CompareVersionIds(a, b string) int {
+	if a == b {
+		return 0
+	}
+	if a == "null" {
+		return 1 // null sorts last
+	}
+	if b == "null" {
+		return -1
+	}
+	aIsNew := isNewFormatVersionId(a)
+	bIsNew := isNewFormatVersionId(b)
+	if aIsNew == bIsNew {
+		// Same format. New format (inverted timestamps) sorts smaller=newer
+		// lexicographically; old format sorts smaller=older.
+		if aIsNew {
+			if a < b {
+				return -1
+			}
+			return 1
+		}
+		if a < b {
+			return 1
+		}
+		return -1
+	}
+	at := getVersionTimestamp(a)
+	bt := getVersionTimestamp(b)
+	if at > bt {
+		return -1
+	}
+	if at < bt {
+		return 1
+	}
+	return 0
+}
+
+func isNewFormatVersionId(versionId string) bool {
+	if len(versionId) < 16 || versionId == "null" {
+		return false
+	}
+	t, err := strconv.ParseUint(versionId[:16], 16, 64)
+	if err != nil {
+		return false
+	}
+	return t > versionIdFormatThreshold
+}
+
+func getVersionTimestamp(versionId string) int64 {
+	if len(versionId) < 16 || versionId == "null" {
+		return 0
+	}
+	t, err := strconv.ParseUint(versionId[:16], 16, 64)
+	if err != nil {
+		return 0
+	}
+	if t > versionIdFormatThreshold {
+		return int64(^uint64(0)>>1) - int64(t)
+	}
+	return int64(t)
+}