}
	return err
}

type ServerInfoState int32

const (
	// Server is live and serving traffic.
	Live ServerInfoState = 0
	// Server is draining listeners in response to external health checks failing.
	Draining ServerInfoState = 1
	// Server has not yet completed cluster manager initialization.
	PreInitializing ServerInfoState = 2

    int totalBytesRead = 0;
    boolean doneEncoding = endOfInput;

    DRAINING:
    while (true) {
      // We stay in draining mode until there are no bytes left in the output buffer. Then we go
      // back to encoding/flushing.
      if (draining) {
        totalBytesRead += drain(b, off + totalBytesRead, len - totalBytesRead);
        if (totalBytesRead == len || doneFlushing) {

    int totalBytesRead = 0;
    boolean doneEncoding = endOfInput;

    DRAINING:
    while (true) {
      // We stay in draining mode until there are no bytes left in the output buffer. Then we go
      // back to encoding/flushing.
      if (draining) {
        totalBytesRead += drain(b, off + totalBytesRead, len - totalBytesRead);
        if (totalBytesRead == len || doneFlushing) {

		return nil, err
	}

	dal := make([]*admin.ListenersConfigDump_DynamicListener, 0)
	for _, l := range listenerDump.DynamicListeners {
		// If a listener was reloaded, it would contain both the active and draining state
		// delete the draining state for proper comparison
		l.DrainingState = nil
		if l.ActiveState != nil {
			dal = append(dal, l)
		}
	}

	// Support v2 or v3 in config dump. See ads.go:RequestedTypes for more info.

}

func (a *Agent) DisableDraining() {
	a.skipDrain.Store(true)
}

func (a *Agent) DrainNow() {
	log.Infof("Agent draining proxy")
	err := a.proxy.Drain(true)
	if err != nil {
		log.Warnf("Error in invoking drain listeners endpoint: %v", err)
	}
	// If we drained now, skip draining + waiting later
	// When we terminate, we will instead exit immediately
	a.DisableDraining()
}

			// This lets the batching routine continue draining the queue immediately.
			b.delegateBackend.ProcessEvents(events...)
		}()
	} else {
		func() {
			defer runtime.HandleCrash()

			// Execute the real processing in a goroutine to keep it from blocking.
			// This lets the batching routine continue draining the queue immediately.
			b.delegateBackend.ProcessEvents(events...)
		}()
	}

}

func (e *envoy) Drain(skipExit bool) error {
	adminPort := uint32(e.AdminPort)

	err := DrainListeners(adminPort, e.Sidecar, skipExit)
	if err != nil {
		log.Infof("failed draining listeners for Envoy on port %d: %v", adminPort, err)
	}
	return err
}

func (e *envoy) UpdateConfig(config []byte) error {
	return os.WriteFile(e.ConfigPath, config, 0o666)
}

	// same value `X`.  If the QueuingConfig's DesiredNumQueues field
	// is zero then the other queuing-specific config parameters are
	// not changed, so that the queues continue draining as before.
	// In any case, reconfiguration does not discard any queue unless
	// and until it is undesired and empty.
	BeginConfigChange(QueuingConfig) (QueueSetCompleter, error)

	exitOnZeroActiveConnectionsEnv = env.Register("EXIT_ON_ZERO_ACTIVE_CONNECTIONS",
		false,
		"When set to true, terminates proxy when number of active connections become zero during draining").Get()

	useExternalWorkloadSDSEnv = env.Register("USE_EXTERNAL_WORKLOAD_SDS", false,
		"When set to true, the istio-agent will require an external SDS and will throw an error if the workload SDS socket is not found").Get()