gae_go_http_json.go

package main

import (
  "net/http"
  "github.com/go-martini/martini"
  "encoding/json"
  "appengine"
  "appengine/urlfetch"
)

type data struct {
  Id    int `json:"id"`
  Name  string `json:"name"`
  Value string `json:"value"`
}

func init() {
  m := martini.Classic()
  m.Use(AppEngine)
  m.Get("/", func(c appengine.Context) string {
    client := urlfetch.Client(c)
    // {id: 1, name: "名前", value: "値"} のような値を返すと想定
    resp, err := client.Get("http://example.com/json")
    if err != nil {
      return err.Error()
    }
    defer resp.Body.Close()
    result := make([]byte, resp.ContentLength)
    resp.Body.Read(result)

    var d data
    json.Unmarshal(result, &d)

    return fmt.Sprint("%s", d)
  })
}
func AppEngine(c martini.Context, r *http.Request) {
  c.MapTo(appengine.NewContext(r), (*appengine.Context)(nil))
}