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main.go
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main.go
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package main
import (
"database/sql"
"encoding/json"
"fmt"
"io"
"net/http"
"os"
_ "github.com/go-sql-driver/mysql"
"github.com/gorilla/mux"
)
var db *sql.DB
type User struct {
Name string `json:"name"`
Fullname string `json:"fullname"`
Email string `json:"email"`
}
func main() {
//main func
//connect to sql database
//define db conn string
//connectionString := "username:password@tcp(ip:port)/db"
connectionString := os.Getenv("CONN_STRING")
if connectionString == "" {
host := os.Getenv("MYSQL_HOST")
username := os.Getenv("MYSQL_USERNAME")
password := os.Getenv("MYSQL_PASSWORD")
dbname := os.Getenv("MYSQL_DBNAME")
connectionString = username + ":" + password + "@tcp(" + host + ")/" + dbname
}
fmt.Println(connectionString)
var err error
db, err = sql.Open("mysql", connectionString)
if err != nil {
fmt.Println("Error validating sql.Open arguments")
panic(err.Error())
}
defer db.Close()
//verify connection to database
err = db.Ping()
if err != nil {
fmt.Println("Unable verify connection to DB with db.Ping()")
panic(err.Error())
}
fmt.Println("Connection to database succesful!")
//create url handlers
route := mux.NewRouter()
route.HandleFunc("/api", getAll).Methods("GET")
route.HandleFunc("/api", createUser).Methods("POST")
route.HandleFunc("/api/{slackname}", readHandler).Methods("GET")
route.HandleFunc("/api/{slackname}", updateHandler).Methods("PATCH")
route.HandleFunc("/api/{slackname}", putHandler).Methods("PUT")
route.HandleFunc("/api/{slackname}", deleteHandler).Methods("DELETE")
//start http server
fmt.Println("*** Server Listening ***")
http.ListenAndServe(":80", route)
}
func createUser(w http.ResponseWriter, r *http.Request) {
// indicate /api path is running
fmt.Println("*** CREATING A USER ***")
// Read the JSON data from the request body.
body, err := io.ReadAll(r.Body)
if err != nil {
fmt.Println(err)
return
}
// Unmarshal the JSON data into a Go object of the User struct type.
user := User{}
err = json.Unmarshal(body, &user)
if err != nil {
fmt.Println(err)
return
}
slackname := user.Name
fullname := user.Fullname
email := user.Email
// get and validate values from request
// slackname := r.FormValue("name")
// fullname := r.FormValue("fullname")
// email := r.FormValue("email")
if slackname == "" {
w.Header().Set("Content-Type", "text/plain") //set text header
w.WriteHeader(206)
fmt.Fprintf(w, "Name is a required parameter! User not created!!") //return error message
return
}
insertStatement := "INSERT INTO `db`.`Users` (`slackname`, `fullname`, `email`) VALUES (?, ?, ?);"
ins, err := db.Prepare(insertStatement)
if err != nil {
fmt.Println("Something went wrong preparing the sql statement", err)
w.Header().Set("Content-Type", "text/plain") //set text header
fmt.Fprintf(w, "Error creating user. Check logs.") //return error message
return
}
defer ins.Close()
_, err = ins.Exec(slackname, fullname, email)
if err != nil {
fmt.Println("Error running DB insert statement", err)
w.WriteHeader(206)
w.Header().Set("Content-Type", "text/plain") //set text header
fmt.Fprintf(w, "Error! Slackname has been taken. Try another name.") //return error message
return
}
fmt.Fprintf(w, "User with name:"+slackname+" created succesfully!")
}
func readHandler(w http.ResponseWriter, r *http.Request) {
//running read handler
fmt.Println("*** READING A USER ***")
// Extract the slackname from the path.
params := mux.Vars(r)
slackname := params["slackname"]
fmt.Println("Route variable: " + slackname)
// run query
query := "SELECT `slackname`,`fullname`,`email` FROM `db`.`Users` WHERE `slackname` = ?;"
res := db.QueryRow(query, slackname)
var user User
err := res.Scan(&user.Name, &user.Fullname, &user.Email)
if err != nil {
fmt.Println(err.Error())
w.Write([]byte("User does not exist"))
return
}
response, err := json.Marshal(user)
if err != nil {
panic(err.Error())
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
w.Write(response)
}
func updateHandler(w http.ResponseWriter, r *http.Request) {
// indicate /api path is running
fmt.Println("*** UPDATING A USER ***")
// Extract the slackname from the path.
params := mux.Vars(r)
slackname0 := params["slackname"]
fmt.Println("Route variable: " + slackname0)
// Read the JSON data from the request body.
body, err := io.ReadAll(r.Body)
if err != nil {
fmt.Println(err)
return
}
// Unmarshal the JSON data into a Go object of the User struct type.
user := User{}
err = json.Unmarshal(body, &user)
if err != nil {
fmt.Println(err)
return
}
slackname := user.Name
fullname := user.Fullname
email := user.Email
//check if slackname exists in DB
var exists bool
err = db.QueryRow("SELECT EXISTS (SELECT 1 FROM `db`.`Users` WHERE `slackname` = ?);", slackname0).Scan(&exists)
if err != nil {
fmt.Println("Unable to determine if username exists", err.Error())
fmt.Fprintf(w, "Unable to determine if username exists")
return
}
if exists == false {
w.Write([]byte("Username does not exist!"))
return
}
if slackname == slackname0 || slackname == "" {
updateStatement := "UPDATE `db`.`Users` SET `fullname`=?, `email`=? WHERE slackname=?;"
ins, err := db.Prepare(updateStatement)
if err != nil {
fmt.Println("Something went wrong preparing the sql statement", err)
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(501) //set text header
fmt.Fprintf(w, "Error creating user. Check logs.") //return error message
return
}
_, err = ins.Exec(fullname, email, slackname0)
if err != nil {
fmt.Println("Error running DB update statement", err)
w.WriteHeader(206)
w.Header().Set("Content-Type", "text/plain") //set text header
fmt.Fprintf(w, "Name has been taken. Try another one.") //return error message
return
}
defer ins.Close()
fmt.Fprintf(w, "User updated succesfully!")
} else {
updateStatement := "UPDATE `db`.`Users` SET `slackname`=?, `fullname`=?, `email`=? WHERE slackname=?;"
ins, err := db.Prepare(updateStatement)
if err != nil {
fmt.Println("Something went wrong preparing the sql statement", err)
w.Header().Set("Content-Type", "text/plain") //set text header
w.WriteHeader(501)
fmt.Fprintf(w, "Error creating user. Check logs.") //return error message
return
}
_, err = ins.Exec(slackname, fullname, email, slackname0)
if err != nil {
fmt.Println("Error running DB update statement", err)
w.WriteHeader(501)
w.Header().Set("Content-Type", "text/plain") //set text header
fmt.Fprintf(w, "Name has been taken. Try another one.") //return error message
return
}
defer ins.Close()
fmt.Fprintf(w, "User with name:"+slackname0+" Updated to "+slackname+" succesfully!")
}
}
func deleteHandler(w http.ResponseWriter, r *http.Request) {
// indicate /api path is running
fmt.Println("*** DELETING A USER ***")
// Extract the slackname from the path.
params := mux.Vars(r)
slackname := params["slackname"]
fmt.Println("Route variable: " + slackname)
//check if slackname exists in DB
var exists bool
err := db.QueryRow("SELECT EXISTS (SELECT 1 FROM `db`.`Users` WHERE `slackname` = ?);", slackname).Scan(&exists)
if err != nil {
fmt.Println("Unable to determine if username exists", err.Error())
fmt.Fprintf(w, "Unable to determine if username exists")
return
}
//fmt.Println("exits", exists)
if exists == false {
w.Write([]byte("Username does not exist!"))
return
}
deleteStatement := "DELETE FROM `db`.`Users` WHERE `slackname` = ?;"
ins, err := db.Prepare(deleteStatement)
if err != nil {
fmt.Println("Something went wrong preparing the sql statement", err)
w.Header().Set("Content-Type", "text/plain") //set text header
fmt.Fprintf(w, "Error deleting user.") //return error message
return
}
defer ins.Close()
_, err = ins.Exec(slackname)
if err != nil {
fmt.Println("Error running DB delete statement", err)
w.WriteHeader(501)
w.Header().Set("Content-Type", "text/plain") //set text header
fmt.Fprintf(w, "Error deleting user.") //return error message
return
}
fmt.Fprintf(w, "User with name:"+slackname+" deleted succesfully!")
}
func putHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Please use PATCH for updates.")
}
func getAll(w http.ResponseWriter, r *http.Request) {
//running read handler
fmt.Println("*** READING ALL USERS ***")
// run query
query := "SELECT `slackname`,`fullname`,`email` FROM `db`.`Users`;"
res, err := db.Query(query)
if err != nil {
w.WriteHeader(206)
fmt.Fprintf(w, "No User in Database.")
return
}
//create json array of Users
var users []User
for res.Next() {
var user User //create User
res.Scan(&user.Name, &user.Fullname, &user.Email) //Scan values to user
users = append(users, user) //Append User to array Users
}
response, err := json.Marshal(users)
if err != nil {
panic(err.Error())
}
//write json response
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
w.Write(response)
}