Adding upstream version 2.52.6.

Signed-off-by: Daniel Baumann <daniel@debian.org>

utils/time.go

@@ -0,0 +1,32 @@
+package utils
+
+import (
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+var (
+	timestampTimer sync.Once
+	// Timestamp please start the timer function before you use this value
+	// please load the value with atomic `atomic.LoadUint32(&utils.Timestamp)`
+	Timestamp uint32
+)
+
+// StartTimeStampUpdater starts a concurrent function which stores the timestamp to an atomic value per second,
+// which is much better for performance than determining it at runtime each time
+func StartTimeStampUpdater() {
+	timestampTimer.Do(func() {
+		// set initial value
+		atomic.StoreUint32(&Timestamp, uint32(time.Now().Unix()))
+		go func(sleep time.Duration) {
+			ticker := time.NewTicker(sleep)
+			defer ticker.Stop()
+
+			for t := range ticker.C {
+				// update timestamp
+				atomic.StoreUint32(&Timestamp, uint32(t.Unix()))
+			}
+		}(1 * time.Second) // duration
+	})
+}