Function WaitInstanceState

ring/util.go:43–59

WaitInstanceState waits until the input instanceID is registered within the ring matching the provided state. A timeout should be provided within the context.

(ctx context.Context, r ReadRing, instanceID string, state InstanceState)

// WaitInstanceState waits until the input instanceID is registered within the
// ring matching the provided state. A timeout should be provided within the context.
func WaitInstanceState(ctx context.Context, r ReadRing, instanceID string, state InstanceState) error {
	backoff := backoff.New(ctx, backoff.Config{
		MinBackoff: 100 * time.Millisecond,
		MaxBackoff: time.Second,
		MaxRetries: 0,
	})

	for backoff.Ongoing() {
		if actualState, err := r.GetInstanceState(instanceID); err == nil && actualState == state {
			return nil
		}

		backoff.Wait()
	}

	return backoff.Err()
}

// WaitRingStability monitors the ring topology for the provided operation and waits until it
// keeps stable for at least minStability.