在 Golang grpc 服务器方法的拦截器中重用日志客户端

func (s *myserver) submitjob(ctx context.context, request *submitjobrequest) (*submitjobresponse, error) {
        s.dd_client.logrequestcount("submitjob")
        start_time := time.now()
        defer s.dd_client.logrequestduration("submitjob", time.since(start_time))

        resp := somefunc()

    return resp, nil
}

func unaryInterceptor(ctx context.Context,
    req interface{},
    info *grpc.UnaryServerInfo,
    handler grpc.UnaryHandler,
) (interface{}, error) {
    dd_client := NewDatadogClient()
    defer dd_client.Close()

        dd_client.LogRequestCount(info.FullMethod)

        start_time := time.Now()

    resp, err := handler(ctx, req)

        dd_client.LogRequestDuration(info.FullMethod, time.Since(start_time))

    return resp, err
}

//your package code....


var dataDog DataDogType

//access it through a wrapper, the wrapper will init the var the first time, 
//the remaining times it will be reused

func GetDataDog()(*DataDogType) {

if dataDog == nil {
    dataDog = NewDatadogClient()
}


return dataDog

}