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handlers.go
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/
handlers.go
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package handlers
import (
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"time"
"github.com/go-zoo/bone"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
)
var (
EnableCors bool
CorsOrigin string
)
type ErrorView struct {
Error string `json:"error"`
}
type AdminHandler interface {
RegisterRoutes(*bone.Mux, *AuthHandler)
}
func ReadFromRequest(request *http.Request, v interface{}) error {
defer request.Body.Close()
body, _ := ioutil.ReadAll(request.Body)
err := json.Unmarshal(body, &v)
if err != nil {
return errors.New("Malformed JSON")
}
return nil
}
func writeResponse(response http.ResponseWriter, bytes []byte, contentType string) {
response.Header().Set("Content-Type", contentType)
writeCorsHeadersIfEnabled(response)
response.Write(bytes)
}
func WriteResponse(response http.ResponseWriter, bytes []byte) {
writeResponse(response, bytes, detectContentType(bytes))
}
func WriteResponseWithContentType(response http.ResponseWriter, bytes []byte, contentType string) {
writeResponse(response, bytes, contentType)
}
func WriteErrorResponse(response http.ResponseWriter, message string, code int) {
writeCorsHeadersIfEnabled(response)
var errorBytes []byte
response.WriteHeader(code)
if message != "" {
errorView := &ErrorView{Error: message}
var err error
errorBytes, err = json.Marshal(errorView)
if err != nil {
response.WriteHeader(500)
return
}
WriteResponse(response, errorBytes)
}
}
func writeCorsHeadersIfEnabled(response http.ResponseWriter) {
if EnableCors {
response.Header().Set("Access-Control-Allow-Origin", CorsOrigin)
response.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST, OPTIONS, DELETE")
response.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization")
response.Header().Set("Access-Control-Allow-Credentials", "true")
}
}
// http.DetectContentType does not detect JSON. This private function
// is intended to wrap and extend http.DetectContentType to allow us
// to detect JSON and return the correct Content-Type.
func detectContentType(body []byte) string {
var js interface{}
if json.Unmarshal(body, &js) == nil {
return "application/json; charset=utf-8"
}
return http.DetectContentType(body)
}
type WebSocketHandler func() ([]byte, error)
func NewWebsocket(handler WebSocketHandler, w http.ResponseWriter, r *http.Request) {
var wsUpgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
conn, err := wsUpgrader.Upgrade(w, r, nil)
if err != nil {
log.WithFields(log.Fields{
"error": err,
}).Error("failed to upgrade websocket")
return
}
for {
messageType, p, err := conn.ReadMessage()
if err != nil {
return
}
log.WithFields(log.Fields{
"message": string(p),
}).Debug("Got message...")
for _ = range time.Tick(1 * time.Second) {
updateBytes, err := handler()
if err = conn.WriteMessage(messageType, updateBytes); err != nil {
log.WithFields(log.Fields{
"message": p,
"error": err.Error(),
}).Debug("Got error when writing message...")
continue
}
}
}
}