Sick HTTP helpers in Go

http_helpers.go

import (
	"encoding/json"
	"log"
	"net"
	"net/http"
	"os"

	"gopkg.in/mgo.v2"

	"github.com/rs/cors"
	"github.com/rs/xaccess"
	"github.com/rs/xhandler"
	"github.com/rs/xlog"
	"github.com/rs/xmux"
	"golang.org/x/net/context"
)

func writeJson(w http.ResponseWriter, value interface{}) error {
	w.Header().Set("Content-Type", "application/json")
	return json.NewEncoder(w).Encode(value)
}

func writeError(ctx context.Context, w http.ResponseWriter, err error) {
	logger := xlog.FromContext(ctx)
	errStr := err.Error()

	w.Header().Set("Content-Type", "text/plain")
	if err == mgo.ErrNotFound {
		http.Error(w, errStr, http.StatusNotFound)
		logger.Error(errStr)
	} else {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		logger.Error(errStr)
	}
}

func readJson(w http.ResponseWriter, r *http.Request, value interface{}) (ok bool) {
	err := json.NewDecoder(r.Body).Decode(value)
	if err != nil {
		http.Error(w, err.Error(), 400)
		return false
	} else {
		return true
	}
}