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core.go
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core.go
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package messageengine
//
// Client MessageEngine DB
// | Connect | |
// | ----------------------> | |
// | | |
// | Auth | |
// | ----------------------> | |
// | | |
// | | Check User |
// | | ---------------------> |
// | | |
// | Auth Result | |
// | <--------------------- | |
// | | |
// | Send Message | |
// | ---------------------> | |
// | | |
// | | Save Message |
// | | ---------------------> |
// | | |
// | Send Message To Users | |
// | <--------------------- | |
// | | |
// | Close | |
// | ----------------------> | |
// | | |
//
import (
"encoding/json"
"fmt"
"github.com/alxarno/swap/logger"
models "github.com/alxarno/swap/models"
"golang.org/x/net/websocket"
db "github.com/alxarno/swap/db2"
)
var (
users = []*userConnection{}
entering = make(chan *userConnection)
leaving = make(chan *userConnection)
sendMessages = make(chan models.NewMessageToUser)
forceSendMessages = make(chan models.ForceMsgToUser)
)
func (s *userConnection) writerUserSys(ws *websocket.Conn) {
for sysMsg := range s.SystemMessageChan {
if err := websocket.Message.Send(ws, string(sysMsg)); err != nil {
// log.Println(fmt.Sprintf("%s %s", writingSystemChannelFailed, err.Error()))
break
}
}
}
func (s *userConnection) writerUser(ws *websocket.Conn) {
for msg := range s.MessageChan {
nowMessage, err := json.Marshal(msg)
if err != nil {
logger.Logger.Println(fmt.Sprintf("Writer User -> %s %s", marshalingMessageFailed, err.Error()))
continue
}
if err := websocket.Message.Send(ws, string(nowMessage)); err != nil {
// log.Println(fmt.Sprintf("Writer User -> %s %s", writingMessageChannelFailed, err.Error()))
break
}
}
}
func decodeNewMessage(msg string, connect *userConnection) {
var data = make(map[string]interface{})
if err := json.Unmarshal([]byte(msg), &data); err != nil {
logger.Logger.Println(fmt.Sprintf("Decode New Message -> %s %s %s", unmarshalingMessageFailed, err.Error(), msg))
return
}
switch data[messageTypeField] {
case messageTypeSystem:
sMessage, err := systemMsg(msg)
if err != nil {
logger.Logger.Println(fmt.Sprintf("Decode Sytem Message -> %s %s %s", unmarshalingMessageFailed, err.Error(), msg))
return
}
if sMessage.Action == messageActionAuth {
authHandler(sMessage, connect)
}
break
case messageTypeUser:
messageToUser, err := userMsg(msg)
if err != nil {
logger.Logger.Println("Decode User Message -> " + err.Error() + msg)
return
}
sendMessages <- *messageToUser
}
}
//ConnectionHandler - handles new WS connection
func ConnectionHandler(ws *websocket.Conn) {
var err error
user := &userConnection{}
user.MessageChan = make(chan models.NewMessageToUser)
user.SystemMessageChan = make(chan string)
user.RemoteAddr = ws.Request().RemoteAddr
go user.writerUser(ws)
go user.writerUserSys(ws)
entering <- user
logger.Logger.Printf("WS user * connected from %s", user.RemoteAddr)
for {
var reply string
if err = websocket.Message.Receive(ws, &reply); err != nil {
break
}
decodeNewMessage(reply, user)
}
leaving <- user
logger.Logger.Printf("WS user %d disconnected %s", user.UserID, user.RemoteAddr)
ws.Close()
}
func broadcaster() {
for {
select {
case msg := <-sendMessages:
chatsUsers, err := db.GetChatsUsers(msg.ChatID)
if err != nil {
continue
}
for _, user := range users {
for _, v := range *chatsUsers {
if v == user.UserID {
user.MessageChan <- msg
}
}
}
case msg := <-forceSendMessages:
for _, user := range users {
if user.UserID == msg.UserID {
user.MessageChan <- msg.Msg
}
}
case cli := <-entering:
users = append(users, cli)
case cli := <-leaving:
//delete connection from list online users
index := -1
for i := 0; i < len(users); i++ {
if users[i] == cli {
index = i
userMove(users[i].UserID, onlineUserDec)
}
}
if index != -1 {
users[index] = users[len(users)-1]
users = users[:len(users)-1]
}
}
}
}
//StartCoreMessenger - starting message engine
func StartCoreMessenger() {
go broadcaster()
}