診斷模塊擴(kuò)展

診斷模塊是用于將服務(wù)中的信息可視化出來，便于問題排查，確認(rèn)服務(wù)狀態(tài)。Kitex 定義了接口用來注冊(cè)診斷 func，擴(kuò)展者可實(shí)現(xiàn)該接口來呈現(xiàn)診斷信息。呈現(xiàn)的方式如：輸出日志、debug 端口查詢展示。Kitex 開源版本暫未提供默認(rèn)擴(kuò)展，但默認(rèn)注冊(cè)了部分可用于診斷的信息，擴(kuò)展者也可以注冊(cè)更多的信息用于問題的排查。

擴(kuò)展接口

// ProbeName is the name of probe.
type ProbeName string

// ProbeFunc is used to get probe data, it is usually a data dump func.
type ProbeFunc func() interface{}

// Service is the interface for debug service.
type Service interface {
   // RegisterProbeFunc is used to register ProbeFunc with probe name
   // ProbeFunc is usually a dump func that to dump info to do problem diagnosis,
   // eg: CBSuite.Dump(), s.RegisterProbeFunc(CircuitInfoKey, cbs.Dump)
   RegisterProbeFunc(ProbeName, ProbeFunc)
}

注冊(cè)診斷信息

// new diagnosisi service
var ds diagnosis.service = NewYourService()

// eg: register dump func to get discovery instances. 
ds.RegisterProbeFunc("instances", dr.Dump)

// eg: wrap the config data as probe func, register func to get config info. 
ds.RegisterProbeFunc("config_info", diagnosis.WrapAsProbeFunc(config))

Kitex 默認(rèn)注冊(cè)的診斷信息

Kitex 默認(rèn)注冊(cè)了部分診斷信息用于問題排查，具體如下：

const (
	// Common
	ChangeEventsKey ProbeName = "events"
	ServiceInfoKey  ProbeName = "service_info"
	OptionsKey      ProbeName = "options"

	// Client
	DestServiceKey ProbeName = "dest_service"
	ConnPoolKey    ProbeName = "conn_pool"
	RetryPolicyKey ProbeName = "retry_policy"
)

集成到 Kitex

通過 option 指定自己的診斷服務(wù)，option: ?WithDiagnosisService?。

// server side
svr := stservice.NewServer(handler, server.WithDiagnosisService(yourDiagnosisService))

// client side
cli, err := xxxservice.NewClient(targetService, client.WithDiagnosisService(yourDiagnosisService))