Add telnet file with support to send and receive text from Merc MUD

[midgaard_bot.git] / sessions.go

diff --git a/sessions.go b/sessions.go
index a0ff861d591fdee13a3825cbf867879cd874ae36..17fa54555dcc062ec2a449e6f9700f4162070ec0 100644 (file)
--- a/sessions.go
+++ b/sessions.go
@@ -1,18 +1,44 @@
+/*
+midgaard_bot, a Telegram bot which sets a bridge to Midgaard Merc MUD
+Copyright (C) 2017 by Javier Sancho Fernandez <jsf at jsancho dot org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 package main
 
 import (
+       "context"
+
        "github.com/go-telegram-bot-api/telegram-bot-api"
+       "github.com/reiver/go-telnet"
 )
 
 type Session struct {
        Chat *tgbotapi.Chat
-       Msgbox chan tgbotapi.Message
+       Input chan *tgbotapi.Message
 }
 
 var sessions map[int64]*Session
+var mercHost string
+var sessionsCtx context.Context
 
-func initSessions() {
+func initSessions(host string, ctx context.Context) error {
        sessions = make(map[int64]*Session)
+       mercHost = host
+       sessionsCtx = ctx
+       return nil
 }
 
 func getSession(chat *tgbotapi.Chat) *Session {
@@ -24,7 +50,42 @@ func getSession(chat *tgbotapi.Chat) *Session {
 }
 
 func newSession(chat *tgbotapi.Chat) *Session {
-       session := Session{chat, make(chan tgbotapi.Message)}
+       session := Session{chat, make(chan *tgbotapi.Message)}
        sessions[chat.ID] = &session
+       startSession(&session)
        return &session
 }
+
+func startSession(session *Session) {
+       ctx, _ := context.WithCancel(sessionsCtx)
+
+       go func() {
+               telnetInput, telnetOutput := make(chan string), make(chan string)
+               caller := TelnetCaller{
+                       Input: telnetInput,
+                       Output: telnetOutput,
+               }
+
+               go func() {
+                       for {
+                               select {
+                               case msg := <-session.Input:
+                                       if msg.Text != "/start" {
+                                               telnetInput <- msg.Text
+                                       }
+                               case body := <-telnetOutput:
+                                       newMsg := tgbotapi.NewMessage(session.Chat.ID, body)
+                                       sendToTelegram(newMsg)
+                               case <-ctx.Done():
+                                       return
+                               }
+                       }
+               }()
+
+               telnet.DialToAndCall(mercHost, caller)
+       }()
+}
+
+func sendToSession(session *Session, message *tgbotapi.Message) {
+       session.Input <- message
+}