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// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
package main
import (
"crypto/tls"
"net"
"go.lindenii.runxiyu.org/lindenii-common/clog"
irc "go.lindenii.runxiyu.org/lindenii-irc"
)
var (
ircSendBuffered chan string
ircSendDirectChan chan errorBack[string]
)
type errorBack[T any] struct {
content T
errorBack chan error
}
func ircBotSession() error {
var err error
var underlyingConn net.Conn
if config.IRC.TLS {
underlyingConn, err = tls.Dial(config.IRC.Net, config.IRC.Addr, nil)
} else {
underlyingConn, err = net.Dial(config.IRC.Net, config.IRC.Addr)
}
if err != nil {
return err
}
defer underlyingConn.Close()
conn := irc.NewConn(underlyingConn)
logAndWriteLn := func(s string) (n int, err error) {
clog.Debug("IRC tx: " + s)
return conn.WriteString(s + "\r\n")
}
_, err = logAndWriteLn("NICK " + config.IRC.Nick)
if err != nil {
return err
}
_, err = logAndWriteLn("USER " + config.IRC.User + " 0 * :" + config.IRC.Gecos)
if err != nil {
return err
}
readLoopError := make(chan error)
writeLoopAbort := make(chan struct{})
go func() {
for {
select {
case <-writeLoopAbort:
return
default:
}
msg, line, err := conn.ReadMessage()
if err != nil {
readLoopError <- err
return
}
clog.Debug("IRC rx: " + line)
switch msg.Command {
case "001":
_, err = logAndWriteLn("JOIN #chat")
if err != nil {
readLoopError <- err
return
}
case "PING":
_, err = logAndWriteLn("PONG :" + msg.Args[0])
if err != nil {
readLoopError <- err
return
}
case "JOIN":
c, ok := msg.Source.(irc.Client)
if !ok {
clog.Error("IRC server told us a non-client is joining a channel...")
}
if c.Nick != config.IRC.Nick {
continue
}
default:
}
}
}()
for {
select {
case err = <-readLoopError:
return err
case line := <-ircSendBuffered:
_, err = logAndWriteLn(line)
if err != nil {
select {
case ircSendBuffered <- line:
default:
clog.Error("unable to requeue IRC message: " + line)
}
writeLoopAbort <- struct{}{}
return err
}
case lineErrorBack := <-ircSendDirectChan:
_, err = logAndWriteLn(lineErrorBack.content)
lineErrorBack.errorBack <- err
if err != nil {
writeLoopAbort <- struct{}{}
return err
}
}
}
}
// ircSendDirect sends an IRC message directly to the connection and bypasses
// the buffering system.
func ircSendDirect(s string) error {
ech := make(chan error, 1)
ircSendDirectChan <- errorBack[string]{
content: s,
errorBack: ech,
}
return <-ech
}
// TODO: Delay and warnings?
func ircBotLoop() {
ircSendBuffered = make(chan string, config.IRC.SendQ)
ircSendDirectChan = make(chan errorBack[string])
for {
err := ircBotSession()
clog.Error("IRC error: " + err.Error())
}
}
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