if err := target.init(); err != nil {
		return false, err
	}
	return target.isActive()
}

// errNotConnected - indicates that the target connection is not active.
var errNotConnected = errors.New("not connected to target server/service")

func (target *WebhookTarget) isActive() (bool, error) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

    cs(ConfigStore)
    ep(Endpoints)
    pc(PushContext)
    sd-->pc
    cs-->pc
    sd-->ep
```

### Config Translation

   while also keeping file watchers on them. Envoy proxy then connects to istio-agent's SDS Server through the defined socket path and gets the cryptographic materials of the certificate files served by the SDS API.
* If istio-agent does not find either the socket, or the certificate files in their respective paths it will start its own SDS Server using a `caClient` to connect to istiod or an external CA, to fetch cryptographic materials (See Default CA Flow).

	mt := monitortest.New(t)
	setupLogging()
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	fixture := connect(ctx)
	ztunClient := fixture.ztunClient
	uid := fixture.uid

	m, fds := readRequest(t, ztunClient)
	// we got am essage from ztun, so it should have observed us being connected
	mt.Assert(ztunnelConnected.Name(), nil, monitortest.Exactly(1))

    assertEquals(
        ImmutableMap.of(Range.closedOpen(0, 1), 1, Range.closedOpen(1, 2), 1),
        rangeMap.asMapOfRanges());

    rangeMap.putCoalescing(Range.closedOpen(1, 1), 1); // empty range coalesces connected ranges
    assertEquals(ImmutableMap.of(Range.closedOpen(0, 2), 1), rangeMap.asMapOfRanges());
  }

  public void testPutCoalescingSubmapEmpty() {
    RangeMap<Integer, Integer> rangeMap = TreeRangeMap.create();

	wg.Add(1)
	go func() {
		defer wg.Done()
		var ack message
		ack.Op = OpAckMux
		ack.Flags = m.BaseFlags
		ack.MuxID = m.ID
		m.send(ack)
		if debugPrint {
			fmt.Println("connected stream mux:", ack.MuxID)
		}
	}()

	// Data inbound to the handler
	var handlerIn chan []byte
	if inboundCap > 0 {
		m.inbound = make(chan []byte, inboundCap)
		handlerIn = make(chan []byte, 1)

    So, we declare the event handler function with standard `def` instead of `async def`.

### `startup` and `shutdown` together

There's a high chance that the logic for your *startup* and *shutdown* is connected, you might want to start something and then finish it, acquire a resource and then release it, etc.

    assertEquals(
        ImmutableMap.of(Range.closedOpen(0, 1), 1, Range.closedOpen(1, 2), 1),
        rangeMap.asMapOfRanges());

    rangeMap.putCoalescing(Range.closedOpen(1, 1), 1); // empty range coalesces connected ranges
    assertEquals(ImmutableMap.of(Range.closedOpen(0, 2), 1), rangeMap.asMapOfRanges());
  }

  public void testPutCoalescingSubmapEmpty() {
    RangeMap<Integer, Integer> rangeMap = TreeRangeMap.create();

// RXSample holds the RX bytes for the duration between
// the last peer to connect and the first peer to disconnect.
// This is to improve the RX throughput accuracy.
type netPerfRX struct {
	RX                uint64    // RX bytes
	lastToConnect     time.Time // time at which last peer to connect to us
	firstToDisconnect time.Time // time at which the first peer disconnects from us

}

// Apply update config to new config
func (c *Config) Apply(config *Config) error {
	if config != c {
		*config = *c
	}
	return nil
}

// AfterInitialize initialize plugins after db connected
func (c *Config) AfterInitialize(db *DB) error {
	if db != nil {
		for _, plugin := range c.Plugins {
			if err := plugin.Initialize(db); err != nil {
				return err
			}
		}
	}
	return nil
}