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main.go
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main.go
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package main
import (
"fmt"
"net/http"
"github.com/gorilla/websocket"
"os"
"database/sql"
_ "github.com/go-sql-driver/mysql"
"encoding/json"
"time"
"strconv"
)
var db *sql.DB
var err error
type Message struct {
mt int
message []byte
}
var msgChans [](chan Message)
func serveHome(w http.ResponseWriter, r *http.Request) {
_, err := r.Cookie("chatter_user_name")
if err != nil {
http.Redirect(w, r, "/login", 301)
} else {
http.ServeFile(w, r, "home.html")
}
}
type MessageStruct struct {
UserFrom string `json:"userFrom"`
UserTo string `json:"userTo"`
Content string `json:"content"`
Date string `json:"date"`
Time string `json:"time"`
Type int `json:"type"`
}
func serveWS(w http.ResponseWriter, r *http.Request) {
upgrader := websocket.Upgrader {
ReadBufferSize : 1024,
WriteBufferSize: 1024,
}
conn, err := upgrader.Upgrade(w, r, nil)
checkError(err, "upgrader.Upgrade")
defer conn.Close()
username_cookie, err := r.Cookie("chatter_user_name")
checkError(err, "[1] r.Cookie")
user_name := username_cookie.Value
var user_id uint64
err = db.QueryRow("select user_id from users where user_name = ?", user_name).Scan(&user_id)
checkError(err, "db.QueryRow(user_id)")
// list streams
stream_names := []string { "1" }
rows, err := db.Query("select stream_name from streams")
checkError(err, "db.Query")
defer rows.Close()
for rows.Next() {
var stream_name string
err := rows.Scan(&stream_name)
checkError(err, "rows.Scan")
stream_names = append(stream_names, stream_name)
}
// conn.WriteMessage(json.Marshal(stream_names))
conn.WriteJSON(stream_names)
// list subscribed streams
subscribed_streams := []string { "6" }
rows, err = db.Query("select stream_id from stream_subscribers where user_id = ?", user_id)
checkError(err, "db.Query(stream_id)")
defer rows.Close()
for rows.Next() {
var stream_id int64
err := rows.Scan(&stream_id)
checkError(err, "rows.Scan(&stream_id)")
var stream_name string
err = db.QueryRow("select stream_name from streams where stream_id = ?", stream_id).Scan(&stream_name)
subscribed_streams = append(subscribed_streams, stream_name)
}
conn.WriteJSON(subscribed_streams)
// list users
user_names := []string { "3" }
name_rows, err := db.Query("select user_name from users")
checkError(err, "db.Query")
defer name_rows.Close()
for name_rows.Next() {
var n string
err := name_rows.Scan(&n)
fmt.Println("find name:", n)
checkError(err, "name_rows.Scan")
user_names = append(user_names, n)
}
conn.WriteJSON(user_names)
// 4 list user's messages
messages := []interface {} { }
messages = append(messages, "4")
mr, err := db.Query("select user_from, user_to, message, message_date, message_time, message_type from messages where user_to=?", user_name)
checkError(err, "db.Query")
defer mr.Close()
for mr.Next() {
var user_from string
var user_to string
var message_string string
var message_date string
var message_time string
var message_type int
err := mr.Scan(&user_from, &user_to, &message_string, &message_date, &message_time, &message_type)
checkError(err, "mr.Scan")
msg := MessageStruct {
UserFrom: user_from,
UserTo: user_to,
Content: message_string,
Date: message_date,
Time: message_time,
Type: message_type,
}
messages = append(messages, msg)
}
// conn.WriteJSON(messages)
enc, err:= json.Marshal(messages)
checkError(err, "json.Marshal")
conn.WriteMessage(websocket.TextMessage, enc)
msgChan := make(chan Message)
msgChans = append(msgChans, msgChan)
println("msgChans is:", msgChans)
var data_parsed [] interface { }
go (func() {
for {
mt, message, err := conn.ReadMessage()
if err != nil {
fmt.Println("conn.ReadMessage error, now closing conn...")
return
}
// checkError(err, "conn.ReadMessage")
err = json.Unmarshal(message, &data_parsed)
checkError(err, "json.Unmarshal")
fmt.Println("data_parsed[0] is:", data_parsed[0])
data_type, err := strconv.Atoi(data_parsed[0].(string))
checkError(err, "strconv.Atoi")
fmt.Println("data_type is:", data_type)
switch data_type {
case 0:
user_from_cookie, err := r.Cookie("chatter_user_name")
checkError(err, "[2] r.Cookie")
user_from := user_from_cookie.Value
user_to := data_parsed[1].(string)
message_string := data_parsed[2].(string)
date := data_parsed[3].(string)
time := data_parsed[4].(string)
message_type, err := strconv.Atoi(data_parsed[5].(string))
checkError(err, "strconv.Atoi")
if message_type == 0 { // send to user
var user_id int
err := db.QueryRow("select user_id from users where user_name = ?", user_to).Scan(&user_id)
if err == sql.ErrNoRows { // send user doesn't exist
errMsg, err := json.Marshal( []string { "9", user_to } )
checkError(err, "json.Marshal")
msgChan <- Message { websocket.TextMessage, errMsg }
continue
}
} else { // send to stream
var stream_id int
err := db.QueryRow("select stream_id from streams where stream_name = ?", user_to).Scan(&stream_id)
if err == sql.ErrNoRows { // send stream doesn't exist
errMsg, err := json.Marshal( []string { "10", user_to } )
checkError(err, "json.Marshal")
msgChan <- Message { websocket.TextMessage, errMsg }
continue
}
}
checkError(err, "sql.Query")
_, err = db.Exec("insert into messages(user_from, user_to, message, message_date, message_time, message_type) values(?, ?, ?, ?, ?, ?)",
user_from, user_to, message_string, date, time, message_type)
checkError(err, "db.Exec")
msg := MessageStruct {
UserFrom: user_from,
UserTo: user_to,
Content: message_string,
Date: date,
Time: time,
Type: message_type,
}
reply_data, err:= json.Marshal([]interface{} { "0", msg })
checkError(err, "json.Marshal")
// reply_data, err := json.Marshal([]string { "0", user_from, user_to, message_string, date, time, strconv.Itoa(message_type) })
// checkError(err, "json.Marshal")
for _, channel := range msgChans {
channel <- Message { mt: mt, message: reply_data }
}
case 1: // create stream: [ "1", stream_name ]
stream_name := data_parsed[1].(string)
fmt.Println("stream_name is:", stream_name)
_, err = db.Exec("insert into streams(stream_name) value(?)", stream_name)
checkError(err, "db.Exec")
reply_data, err := json.Marshal([]string { "1", stream_name })
checkError(err, "json.Marshal")
for _, channel := range msgChans {
channel <- Message { mt: mt, message: reply_data }
}
case 5: // [ "5", user_name, stream_name ] user subscribing to stream
user_name := data_parsed[1].(string)
stream_name := data_parsed[2].(string)
fmt.Println("user_name is:", user_name)
fmt.Println("stream_name is:", stream_name)
var user_id uint64
err := db.QueryRow("select user_id from users where user_name = ?", user_name).Scan(&user_id)
checkError(err, "db.QueryRow(user_id)")
var stream_id uint64
err = db.QueryRow("select stream_id from streams where stream_name = ?", stream_name).Scan(&stream_id)
checkError(err, "db.QueryRow(stream_id)")
var unused int64
err = db.QueryRow("select user_id from stream_subscribers where user_id = ? and stream_id = ?", user_id, stream_id).Scan(&unused)
if err == sql.ErrNoRows { // user hasn't subscribed
_, err = db.Exec("insert ignore into stream_subscribers(user_id, stream_id) values (?, ?)", user_id, stream_id)
checkError(err, "db.Exec(insert into stream_subscribers")
reply_data, err := json.Marshal([]string { "6", stream_name })
checkError(err, "json.Marshal")
msgChan <- Message { mt: mt, message: reply_data }
} else {
checkError(err, "db.QueryRow")
}
case 7: // [ "7", stream_name ] asking for stream messages
stream_name := data_parsed[1].(string)
rows, err := db.Query(`select user_from, message, message_date, message_time, message_id
from messages where message_type = 1 and user_to = ?`, stream_name);
checkError(err, "case 7")
defer rows.Close()
// reply := []map[string]interface{}{}
reply := []interface{}{}
reply = append(reply, []interface{}{"8", stream_name}...)
for rows.Next() {
var user_from string
var message string
var message_date string
var message_time string
var message_id int64
err := rows.Scan(&user_from, &message, &message_date, &message_time, &message_id)
checkError(err, "case 7 row")
reply_entry := map[string]interface{}{}
reply_entry["user_from"] = user_from
reply_entry["message"] = message
reply_entry["message_date"] = message_date
reply_entry["message_time"] = message_time
reply_entry["message_id"] = message_id
reply = append(reply, reply_entry)
}
reply_json, err := json.Marshal(reply)
checkError(err, "case 8 json")
fmt.Println("XXX will send type 8")
msgChan <- Message { mt: mt, message: reply_json }
case 11:
user_name := data_parsed[1].(string)
stream_name := data_parsed[2].(string)
fmt.Println("user_name is:", user_name)
fmt.Println("stream_name is:", stream_name)
var user_id uint64
err := db.QueryRow("select user_id from users where user_name = ?", user_name).Scan(&user_id)
checkError(err, "db.QueryRow(user_id)")
var stream_id uint64
err = db.QueryRow("select stream_id from streams where stream_name = ?", stream_name).Scan(&stream_id)
checkError(err, "db.QueryRow(stream_id)")
_, err = db.Exec("delete from stream_subscribers where (user_id, stream_id) = (?, ?)", user_id, stream_id)
check(err)
msgChan <- Message { mt: mt, message: message }
}
}
})()
for {
message_struct := <- msgChan
conn.WriteMessage(message_struct.mt, message_struct.message)
}
}
func signupPage(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.ServeFile(w, r, "signup.html")
return
}
username := r.FormValue("username")
password := r.FormValue("password")
fmt.Println("username is:", username)
fmt.Println("password is:", password)
var user string
err := db.QueryRow("select user_name from users where user_name=?", username).Scan(&user)
switch {
case err == sql.ErrNoRows:
_, err = db.Exec("insert into users(user_name, password) values(?, ?)", username, password)
if err != nil {
http.Error(w, "Error quering database.", 500)
return
}
w.Write([]byte("User created."))
return
case err != nil:
http.Error(w, "Error quering database.", 500)
return
default:
http.Redirect(w, r, "/", 301)
}
}
func loginPage(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
http.ServeFile(w, r, "login.html")
return
}
username := r.FormValue("username")
password := r.FormValue("password")
fmt.Println("username is:", username)
fmt.Println("password is:", password)
var user string
var pass string
err := db.QueryRow("select user_name, password from users where user_name=?", username).Scan(&user, &pass)
switch {
case err == sql.ErrNoRows:
http.Redirect(w, r, "/", 301)
return
case err != nil:
http.Error(w, "Error quering database.", 500)
return
default:
if password == pass {
expires := time.Now().AddDate(0, 0, 1)
cookie := http.Cookie {
Name: "chatter_user_name",
Expires: expires,
Value: username,
}
http.SetCookie(w, &cookie)
}
http.Redirect(w, r, "/", 301)
}
}
func logoutPage(w http.ResponseWriter, r *http.Request) {
fmt.Println("in serveLogout, will log out")
expired := time.Now().AddDate(0, 0, -1)
cookie := http.Cookie {
Name: "chatter_user_name",
Expires: expired,
Value: "",
}
http.SetCookie(w, &cookie)
w.Write([]byte("BYE BYE"));
}
func main() {
dataSourceName := ""
db, err = sql.Open("mysql", dataSourceName)
if err != nil {
panic(err.Error())
}
defer db.Close()
err = db.Ping()
if err != nil {
panic(err.Error())
}
fmt.Println("addr is:", ":8090")
http.HandleFunc("/", serveHome)
http.HandleFunc("/ws", serveWS)
http.HandleFunc("/signup", signupPage)
http.HandleFunc("/login", loginPage)
http.HandleFunc("/logout", logoutPage)
err = http.ListenAndServe(":8090", nil)
// err = http.ListenAndServeTLS(":8090", "server.crt", "server.key", nil)
checkError(err, "http.ListenAndServe")
}
func checkError(err error, msg string) {
if err != nil {
fmt.Printf("[%s] %s\n", msg, err)
os.Exit(-1)
}
}
func check(err error) {
if err != nil {
panic(err)
}
}