Go map with pointers to structs / with structs

no_pointers.go

package webservice

import (
  "io"
  "io/ioutil"
  "net/http"
  "encoding/json"
  "github.com/bmizerany/pat"
  "manuel.kiessling.net/multivariate/runner/types"
//  "fmt"
)

var experiments = make(map[string]types.Experiment)

func AddExperiment(res http.ResponseWriter, req *http.Request) {
  body, _ := ioutil.ReadAll(req.Body)
  data := make(map[string]string)
  json.Unmarshal(body, &data)
  experiment := types.Experiment{}
  experiment.Name = data["name"]
  experiment.SetUrl(data["url"])
  experiments[data["url"]] = experiment
}

func GetExperiments(res http.ResponseWriter, req *http.Request) {
  url := req.FormValue("url")
  experiment := experiments[url]
  if experiment.Name != "" {
    io.WriteString(res, "OK: " + url + " " + experiment.Name)
  } else {
    io.WriteString(res, "FAIL: " + url)
  }
}

func NewMux() (mux *pat.PatternServeMux) {
  mux = pat.New()
  mux.Get("/experiments/", http.HandlerFunc(GetExperiments))
  mux.Post("/experiments/", http.HandlerFunc(AddExperiment))
  return mux 
}

pointers.go

package webservice

import (
  "io"
  "io/ioutil"
  "net/http"
  "encoding/json"
  "github.com/bmizerany/pat"
  "manuel.kiessling.net/multivariate/runner/types"
//  "fmt"
)

var experiments = make(map[string]*(types.Experiment))

func AddExperiment(res http.ResponseWriter, req *http.Request) {
  body, _ := ioutil.ReadAll(req.Body)
  data := make(map[string]string)
  json.Unmarshal(body, &data)
  experiment := new(types.Experiment)
  experiment.Name = data["name"]
  experiment.SetUrl(data["url"])
  experiments[data["url"]] = experiment
}

func GetExperiments(res http.ResponseWriter, req *http.Request) {
  url := req.FormValue("url")
  experiment := experiments[url]
  if experiment != nil {
    io.WriteString(res, "OK: " + url + " " + (*experiment).Name)
  } else {
    io.WriteString(res, "FAIL: " + url)
  }
}

func NewMux() (mux *pat.PatternServeMux) {
  mux = pat.New()
  mux.Get("/experiments/", http.HandlerFunc(GetExperiments))
  mux.Post("/experiments/", http.HandlerFunc(AddExperiment))
  return mux 
}