func()

in options.go [83:168]

• 70 lines of code
• 22 McCabe index (conditional complexity)

func (rc *InstanceOptions) init(opts ...InstanceOption) error {
	for _, opt := range opts {
		opt(rc)
	}

	// remaining procedure is like RootConfig.Init() without RootConfig.Start()
	// tasks of RootConfig.Start() would be decomposed to Client and Server
	rcCompat := compatRootConfig(rc)
	if err := rcCompat.Logger.Init(); err != nil { // init default logger
		return err
	}
	if err := rcCompat.ConfigCenter.Init(rcCompat); err != nil {
		log.Infof("[Config Center] Config center doesn't start")
		log.Debugf("config center doesn't start because %s", err)
	} else {
		compatInstanceOptions(rcCompat, rc)
		if err = rcCompat.Logger.Init(); err != nil { // init logger using config from config center again
			return err
		}
	}

	if err := rcCompat.Application.Init(); err != nil {
		return err
	}

	// init user define
	if err := rcCompat.Custom.Init(); err != nil {
		return err
	}

	// init protocol
	for _, protocolConfig := range rcCompat.Protocols {
		if err := protocolConfig.Init(); err != nil {
			return err
		}
	}

	// init registry
	registries := rcCompat.Registries
	if registries != nil {
		for _, reg := range registries {
			if err := reg.Init(); err != nil {
				return err
			}
		}
	}

	if err := rcCompat.Metrics.Init(rcCompat); err != nil {
		return err
	}
	if err := rcCompat.Otel.Init(rcCompat.Application); err != nil {
		return err
	}

	routers := rcCompat.Router
	if len(routers) > 0 {
		for _, r := range routers {
			if err := r.Init(); err != nil {
				return err
			}
		}
		rcCompat.Router = routers
	}

	// provider、consumer must last init
	if err := rcCompat.Provider.Init(rcCompat); err != nil {
		return err
	}
	if err := rcCompat.Consumer.Init(rcCompat); err != nil {
		return err
	}
	if err := rcCompat.Shutdown.Init(); err != nil {
		return err
	}
	config.SetRootConfig(*rcCompat)

	if err := rc.initMetadataReport(); err != nil {
		return err
	}
	if err := metadata.InitRegistryMetadataReport(rc.Registries); err != nil {
		return err
	}

	compatInstanceOptions(rcCompat, rc) // overrider options config because some config are changed after init
	return nil
}