goRecommender/serverRoutes.go

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"

	"github.com/gorilla/mux"
)

type Routes []Route

var routes = Routes{
	Route{
		"Index",
		"GET",
		"/",
		Index,
	},
	Route{
		"Recommendations",
		"GET",
		"/r/{userid}/{nrec}",
		Recommendations,
	},
	Route{
		"NewUser",
		"POST",
		"/user",
		NewUser,
	},
	Route{
		"SelectItem",
		"GET",
		"/selectItem/{userid}/{itemid}",
		SelectItem,
	},
}

//ROUTES

func Index(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintln(w, "ask for recommendations in /r")
}

func NewUser(w http.ResponseWriter, r *http.Request) {
	ipFilter(w, r)
	decoder := json.NewDecoder(r.Body)
	var newUser UserModel
	err := decoder.Decode(&newUser)
	check(err)
	defer r.Body.Close()
	newUser = user.clusterAge(newUser)

	saveUser(userCollection, newUser)

	fmt.Println(newUser)
	jNewUser, err := json.Marshal(newUser)
	check(err)
	fmt.Fprintln(w, string(jNewUser))
}
func Recommendations(w http.ResponseWriter, r *http.Request) {
	ipFilter(w, r)
	vars := mux.Vars(r)
	userid := vars["userid"]
	nrec, err := strconv.Atoi(vars["nrec"])
	check(err)

	//now, get recommendations
	items := getRecommendations(userid, nrec)
	//convert []items struct to json
	jItems, err := json.Marshal(items)
	check(err)

	fmt.Fprintln(w, string(jItems))
}
func SelectItem(w http.ResponseWriter, r *http.Request) {
	ipFilter(w, r)
	vars := mux.Vars(r)
	userid := vars["userid"]
	itemid := vars["itemid"]
	//find item
	item, err := getItemById(itemid)
	if err != nil {
		fmt.Fprintln(w, "item "+itemid+" not found")
	}

	//find user
	user, err := getUserById(userid)
	if err != nil {
		fmt.Fprintln(w, "user "+userid+" not found")
	}

	//increase TActed in item
	item.TActed = item.TActed + 1

	//save item
	item, err = updateItem(item)
	check(err)
	fmt.Println(item)

	//add item to []Actions of user
	user.Actions = append(user.Actions, itemid)

	//save user
	user, err = updateUser(user)
	check(err)
	fmt.Println(user)

	fmt.Fprintln(w, "user: "+userid+", selects item: "+itemid)
}