Function processChange

supervisor/supervisor.go:298–333

processChange takes the backend change notification emitted by the backend and applies it to the server.

(p proxy.Proxy, ch interface{})

// processChange takes the backend change notification emitted by the backend
// and applies it to the server.
func processChange(p proxy.Proxy, ch interface{}) error {
	switch change := ch.(type) {
	case *engine.HostUpserted:
		return p.UpsertHost(change.Host)
	case *engine.HostDeleted:
		return p.DeleteHost(change.HostKey)

	case *engine.ListenerUpserted:
		return p.UpsertListener(change.Listener)

	case *engine.ListenerDeleted:
		return p.DeleteListener(change.ListenerKey)

	case *engine.FrontendUpserted:
		return p.UpsertFrontend(change.Frontend)
	case *engine.FrontendDeleted:
		return p.DeleteFrontend(change.FrontendKey)

	case *engine.MiddlewareUpserted:
		return p.UpsertMiddleware(change.FrontendKey, change.Middleware)

	case *engine.MiddlewareDeleted:
		return p.DeleteMiddleware(change.MiddlewareKey)

	case *engine.BackendUpserted:
		return p.UpsertBackend(change.Backend)
	case *engine.BackendDeleted:
		return p.DeleteBackend(change.BackendKey)

	case *engine.ServerUpserted:
		return p.UpsertServer(change.BackendKey, change.Server)
	case *engine.ServerDeleted:
		return p.DeleteServer(change.ServerKey)
	}
	return fmt.Errorf("unsupported change: %#v", ch)
}