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|
package sleepy
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
)
const (
GET = "GET"
POST = "POST"
PUT = "PUT"
DELETE = "DELETE"
)
type geter interface {
Get(values url.Values) (int, interface{})
}
type poster interface {
Post(values url.Values) (int, interface{})
}
type puter interface {
Put(values url.Values) (int, interface{})
}
type deleter interface {
Delete(values url.Values) (int, interface{})
}
type Api struct{}
func (api *Api) Abort(rw http.ResponseWriter, statusCode int) {
rw.WriteHeader(statusCode)
}
func (api *Api) requestHandler(resource interface{}) http.HandlerFunc {
return func(rw http.ResponseWriter, request *http.Request) {
method := request.Method
if request.ParseForm() != nil {
api.Abort(rw, 400)
return
}
values := request.Form
var data interface{} = ""
var code int = 405
switch method {
case GET:
if r, ok := resource.(geter); ok {
code, data = r.Get(values)
}
case POST:
if r, ok := resource.(poster); ok {
code, data = r.Post(values)
}
case PUT:
if r, ok := resource.(puter); ok {
code, data = r.Put(values)
}
case DELETE:
if r, ok := resource.(deleter); ok {
code, data = r.Delete(values)
}
default:
api.Abort(rw, 405)
return
}
responseWriter := json.NewEncoder(rw)
rw.WriteHeader(code)
if responseWriter.Encode(data) != nil {
api.Abort(rw, 500)
return
}
}
}
func (api *Api) AddResource(resource interface{}, path string) {
http.HandleFunc(path, api.requestHandler(resource))
}
func (api *Api) Start(port int) {
portString := fmt.Sprintf(":%d", port)
http.ListenAndServe(portString, nil)
}
|
