"net/http" "strings" "github.com/go-kit/kit/endpoint" httptransport "github.com/go-kit/kit/transport/http" ) // StringService provides operations on strings. type StringService interface { Uppercase(string) (string, error) Count(string) int } // stringService is a concrete implementation of StringService type stringService struct{} func (stringService) Uppercase(s string) (string, error) { if s == "" { return "", ErrEmpty } return strings.ToUpper(s), nil } func (stringService) Count(s string) int { return len(s) } // ErrEmpty is returned when an input string is empty. var ErrEmpty = errors.New("empty string") // For each method, we define request and response structs type uppercaseRequest struct { S string `json:"s"` } type uppercaseResponse struct { V string `json:"v"` Err string `json:"err,omitempty"` // errors don't define JSON marshaling } type countRequest struct { S string `json:"s"` } type countResponse struct { V int `json:"v"` } // Endpoints are a primary abstraction in go-kit. An endpoint represents a single RPC (method in our service interface) func makeUppercaseEndpoint(svc StringService) endpoint.Endpoint { return func(_ context.Context, request interface{}) (interface{}, error) { req := request.(uppercaseRequest) v, err := svc.Uppercase(req.S) if err != nil { return uppercaseResponse{v, err.Error()}, nil } return uppercaseResponse{v, ""}, nil } } func makeCountEndpoint(svc StringService) endpoint.Endpoint { return func(_ context.Context, request interface{}) (interface{}, error) { req := request.(countRequest) v := svc.Count(req.S) return countResponse{v}, nil } } // Transports expose the service to the network. In this first example we utilize JSON over HTTP. func main() { svc := stringService{} uppercaseHandler := httptransport.NewServer( makeUppercaseEndpoint(svc), decodeUppercaseRequest, encodeResponse, ) countHandler := httptransport.NewServer( makeCountEndpoint(svc), decodeCountRequest, encodeResponse, ) http.Handle("/uppercase", uppercaseHandler) http.Handle("/count", countHandler) log.Fatal(http.ListenAndServe(":8080", nil)) } func decodeUppercaseRequest(_ context.Context, r *http.Request) (interface{}, error) { var request uppercaseRequest if err := json.NewDecoder(r.Body).Decode(&request); err != nil { return nil, err } return request, nil } func decodeCountRequest(_ context.Context, r *http.Request) (interface{}, error) { var request countRequest if err := json.NewDecoder(r.Body).Decode(&request); err != nil { return nil, err } return request, nil } func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error { return json.NewEncoder(w).Encode(response) } Ref.: https://github.com/go-kit/kit/blob/master/examples/stringsvc1/main.go
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