discovery service

api/pkg/discovery/instanceid.go

@@ -0,0 +1,27 @@
+package discovery
+
+import (
+	"strings"
+	"sync"
+
+	"github.com/google/uuid"
+)
+
+var (
+	instanceID          string
+	instanceOnce        sync.Once
+	instanceIDGenerator = func() string {
+		return uuid.NewString()
+	}
+)
+
+// InstanceID returns a unique, process-stable identifier for the running service instance.
+func InstanceID() string {
+	instanceOnce.Do(func() {
+		instanceID = strings.TrimSpace(instanceIDGenerator())
+		if instanceID == "" {
+			instanceID = uuid.NewString()
+		}
+	})
+	return instanceID
+}