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main.go
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main.go
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package main
import (
"database/sql"
"encoding/json"
"log"
"net/http"
"os"
"github.com/gorilla/mux"
_ "github.com/lib/pq"
)
type Men struct {
Rank int `json:"rank"`
Name string `json:"name"`
Country string `json:"country"`
}
func main() {
//connection to database
db, err := sql.Open("postgres", os.Getenv("DATABASE_URL"))
if err!= nil {
log.Fatal(err)
}
defer db.Close()
//create table if it doesn't exist
_, err = db.Exec("CREATE TABLE IF NOT EXISTS men(rank int, name text, country text);")
if err!= nil {
log.Fatal(err)
}
//create router
router := mux.NewRouter()
router.HandleFunc("/men", getMen(db)).Methods("GET")
router.HandleFunc("/men/{id}", getMenByID(db)).Methods("GET")
router.HandleFunc("/men", createUser(db)).Methods("POST")
router.HandleFunc("/men/{id}", updateUser(db)).Methods("PUT")
router.HandleFunc("/men/{id}", deleteUser(db)).Methods("DELETE")
//start server
log.Fatal(http.ListenAndServe(":8000", jsonContentTypeMiddleware(router)))
}
func jsonContentTypeMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
next.ServeHTTP(w, r)
})
}
//get all mens
func getMen(db *sql.DB) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
rows, err := db.Query("SELECT rank, name, country FROM men")
if err!= nil {
log.Fatal(err)
}
defer rows.Close()
var men Men
for rows.Next() {
err := rows.Scan(&men.Rank, &men.Name, &men.Country)
if err!= nil {
log.Fatal(err)
}
}
if err := rows.Err(); err!= nil {
log.Fatal(err)
}
json.NewEncoder(w).Encode(men)
}
}
//get user by id
func getMenByID(db *sql.DB) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
row := db.QueryRow("SELECT rank, name, country FROM men WHERE id = $1", id)
var men Men
err := row.Scan(&men.Rank, &men.Name, &men.Country)
if err!= nil {
log.Fatal(err)
}
json.NewEncoder(w).Encode(men)
}
}
//create user
func createUser(db *sql.DB) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
var men Men
err := json.NewDecoder(r.Body).Decode(&men)
if err!= nil {
log.Fatal(err)
}
_, err = db.Exec("INSERT INTO men (name, country) VALUES ($1, $2)", men.Name, men.Country)
if err!= nil {
log.Fatal(err)
}
json.NewEncoder(w).Encode(men)
}
}
//update user
func updateUser(db *sql.DB) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
var men Men
err := json.NewDecoder(r.Body).Decode(&men)
if err!= nil {
log.Fatal(err)
}
_, err = db.Exec("UPDATE men SET name = $1, country = $2 WHERE id = $3", men.Name, men.Country, id)
if err!= nil {
log.Fatal(err)
}
json.NewEncoder(w).Encode(men)
}
}
//delete user
func deleteUser(db *sql.DB) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
_, err := db.Exec("DELETE FROM men WHERE id = $1", id)
if err!= nil {
log.Fatal(err)
}
json.NewEncoder(w).Encode(id)
}
}