/
transports.go
111 lines (92 loc) · 2.88 KB
/
transports.go
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package main
import (
"context"
"encoding/json"
"errors"
kitjwt "github.com/go-kit/kit/auth/jwt"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/tracing/zipkin"
kithttp "github.com/go-kit/kit/transport/http"
"github.com/gorilla/mux"
gozipkin "github.com/openzipkin/zipkin-go"
"github.com/prometheus/client_golang/prometheus/promhttp"
"net/http"
"strconv"
)
var (
ErrorBadRequest = errors.New("invalid request parameter")
)
// MakeHttpHandler make http handler use mux
func MakeHttpHandler(ctx context.Context, endpoints ArithmeticEndpoints, zipkinTracer *gozipkin.Tracer, logger log.Logger) http.Handler {
r := mux.NewRouter()
zipkinServer := zipkin.HTTPServerTrace(zipkinTracer, zipkin.Name("http-transport"))
options := []kithttp.ServerOption{
kithttp.ServerErrorLogger(logger),
kithttp.ServerErrorEncoder(kithttp.DefaultErrorEncoder),
zipkinServer,
}
r.Methods("POST").Path("/calculate/{type}/{a}/{b}").Handler(kithttp.NewServer(
endpoints.ArithmeticEndpoint,
decodeArithmeticRequest,
encodeArithmeticResponse,
append(options, kithttp.ServerBefore(kitjwt.HTTPToContext()))...,
))
r.Path("/metrics").Handler(promhttp.Handler())
// create health check handler
r.Methods("GET").Path("/health").Handler(kithttp.NewServer(
endpoints.HealthCheckEndpoint,
decodeHealthCheckRequest,
encodeArithmeticResponse,
options...,
))
r.Methods("POST").Path("/login").Handler(kithttp.NewServer(
endpoints.AuthEndpoint,
decodeLoginRequest,
encodeLoginResponse,
options...,
))
return r
}
// decodeArithmeticRequest decode request params to struct
func decodeArithmeticRequest(_ context.Context, r *http.Request) (interface{}, error) {
vars := mux.Vars(r)
requestType, ok := vars["type"]
if !ok {
return nil, ErrorBadRequest
}
pa, ok := vars["a"]
if !ok {
return nil, ErrorBadRequest
}
pb, ok := vars["b"]
if !ok {
return nil, ErrorBadRequest
}
a, _ := strconv.Atoi(pa)
b, _ := strconv.Atoi(pb)
return ArithmeticRequest{
RequestType: requestType,
A: a,
B: b,
}, nil
}
// encodeArithmeticResponse encode response to return
func encodeArithmeticResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
w.Header().Set("Content-Type", "application/json;charset=utf-8")
return json.NewEncoder(w).Encode(response)
}
// decodeHealthCheckRequest decode request
func decodeHealthCheckRequest(ctx context.Context, r *http.Request) (interface{}, error) {
return HealthRequest{}, nil
}
func decodeLoginRequest(_ context.Context, r *http.Request) (interface{}, error) {
var loginRequest AuthRequest
if err := json.NewDecoder(r.Body).Decode(&loginRequest); err != nil {
return nil, err
}
return loginRequest, nil
}
func encodeLoginResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
w.Header().Set("Content-Type", "application/json;charset=utf-8")
return json.NewEncoder(w).Encode(response)
}