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// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
package irc
import (
"context"
"crypto/tls"
"fmt"
"log/slog"
"net"
"go.lindenii.runxiyu.org/forge/forged/internal/common/misc"
)
// Bot represents an IRC bot client that handles events and allows for sending messages.
type Bot struct {
// TODO: Use each config field instead of embedding Config here.
config *Config
ircSendBuffered chan string
ircSendDirectChan chan misc.ErrorBack[string]
}
// NewBot creates a new Bot instance using the provided configuration.
func NewBot(c *Config) (b *Bot) {
b = &Bot{
config: c,
} //exhaustruct:ignore
return
}
// Connect establishes a new IRC session and starts handling incoming and outgoing messages.
// This method blocks until an error occurs or the connection is closed.
func (b *Bot) Connect(ctx context.Context) error {
var err error
var underlyingConn net.Conn
if b.config.TLS {
dialer := tls.Dialer{} //exhaustruct:ignore
underlyingConn, err = dialer.DialContext(ctx, b.config.Net, b.config.Addr)
} else {
dialer := net.Dialer{} //exhaustruct:ignore
underlyingConn, err = dialer.DialContext(ctx, b.config.Net, b.config.Addr)
}
if err != nil {
return fmt.Errorf("dialing irc: %w", err)
}
defer func() {
_ = underlyingConn.Close()
}()
conn := NewConn(underlyingConn)
logAndWriteLn := func(s string) (n int, err error) {
slog.Debug("irc tx", "line", s)
return conn.WriteString(s + "\r\n")
}
_, err = logAndWriteLn("NICK " + b.config.Nick)
if err != nil {
return err
}
_, err = logAndWriteLn("USER " + b.config.User + " 0 * :" + b.config.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
}
slog.Debug("irc rx", "line", 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.(Client)
if !ok {
slog.Error("unable to convert source of JOIN to client")
}
if c.Nick != b.config.Nick {
continue
}
default:
}
}
}()
for {
select {
case err = <-readLoopError:
return err
case line := <-b.ircSendBuffered:
_, err = logAndWriteLn(line)
if err != nil {
select {
case b.ircSendBuffered <- line:
default:
slog.Error("unable to requeue message", "line", line)
}
writeLoopAbort <- struct{}{}
return err
}
case lineErrorBack := <-b.ircSendDirectChan:
_, err = logAndWriteLn(lineErrorBack.Content)
lineErrorBack.ErrorChan <- err
if err != nil {
writeLoopAbort <- struct{}{}
return err
}
}
}
}
// SendDirect sends an IRC message directly to the connection and bypasses
// the buffering system.
func (b *Bot) SendDirect(line string) error {
ech := make(chan error, 1)
b.ircSendDirectChan <- misc.ErrorBack[string]{
Content: line,
ErrorChan: ech,
}
return <-ech
}
// Send queues a message to be sent asynchronously via the buffered send queue.
// If the queue is full, the message is dropped and an error is logged.
func (b *Bot) Send(line string) {
select {
case b.ircSendBuffered <- line:
default:
slog.Error("irc sendq full", "line", line)
}
}
// ConnectLoop continuously attempts to maintain an IRC session.
// If the connection drops, it automatically retries with no delay.
func (b *Bot) ConnectLoop(ctx context.Context) {
b.ircSendBuffered = make(chan string, b.config.SendQ)
b.ircSendDirectChan = make(chan misc.ErrorBack[string])
for {
err := b.Connect(ctx)
slog.Error("irc session error", "error", err)
}
}
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