soju/upstream.go

264 lines
5.8 KiB
Go

package jounce
import (
"crypto/tls"
"fmt"
"io"
"net"
"strconv"
"strings"
"time"
"gopkg.in/irc.v3"
)
type upstreamChannel struct {
Name string
Topic string
TopicWho string
TopicTime time.Time
Status channelStatus
Members map[string]membership
complete bool
}
type upstreamConn struct {
upstream *Upstream
logger Logger
net net.Conn
irc *irc.Conn
srv *Server
messages chan<- *irc.Message
serverName string
availableUserModes string
availableChannelModes string
channelModesWithParam string
registered bool
closed bool
modes modeSet
channels map[string]*upstreamChannel
}
func connectToUpstream(s *Server, upstream *Upstream) (*upstreamConn, error) {
logger := &prefixLogger{s.Logger, fmt.Sprintf("upstream %q: ", upstream.Addr)}
logger.Printf("connecting to server")
netConn, err := tls.Dial("tcp", upstream.Addr, nil)
if err != nil {
return nil, fmt.Errorf("failed to dial %q: %v", upstream.Addr, err)
}
msgs := make(chan *irc.Message, 64)
conn := &upstreamConn{
upstream: upstream,
logger: logger,
net: netConn,
irc: irc.NewConn(netConn),
srv: s,
messages: msgs,
channels: make(map[string]*upstreamChannel),
}
go func() {
for msg := range msgs {
if err := conn.irc.WriteMessage(msg); err != nil {
conn.logger.Printf("failed to write message: %v", err)
}
}
}()
return conn, nil
}
func (c *upstreamConn) Close() error {
if c.closed {
return fmt.Errorf("upstream connection already closed")
}
if err := c.net.Close(); err != nil {
return err
}
close(c.messages)
c.closed = true
return nil
}
func (c *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
ch, ok := c.channels[name]
if !ok {
return nil, fmt.Errorf("unknown channel %q", name)
}
return ch, nil
}
func (c *upstreamConn) handleMessage(msg *irc.Message) error {
switch msg.Command {
case "PING":
// TODO: handle params
c.messages <- &irc.Message{
Command: "PONG",
Params: []string{c.srv.Hostname},
}
return nil
case "MODE":
if len(msg.Params) < 2 {
return newNeedMoreParamsError(msg.Command)
}
if nick := msg.Params[0]; nick != c.upstream.Nick {
return fmt.Errorf("received MODE message for unknow nick %q", nick)
}
return c.modes.Apply(msg.Params[1])
case "NOTICE":
c.logger.Print(msg)
case irc.RPL_WELCOME:
c.registered = true
c.logger.Printf("connection registered")
for _, ch := range c.upstream.Channels {
c.messages <- &irc.Message{
Command: "JOIN",
Params: []string{ch},
}
}
case irc.RPL_MYINFO:
if len(msg.Params) < 5 {
return newNeedMoreParamsError(msg.Command)
}
c.serverName = msg.Params[1]
c.availableUserModes = msg.Params[3]
c.availableChannelModes = msg.Params[4]
if len(msg.Params) > 5 {
c.channelModesWithParam = msg.Params[5]
}
case "JOIN":
if len(msg.Params) < 1 {
return newNeedMoreParamsError(msg.Command)
}
for _, ch := range strings.Split(msg.Params[0], ",") {
c.logger.Printf("joined channel %q", ch)
c.channels[ch] = &upstreamChannel{
Name: ch,
Members: make(map[string]membership),
}
}
case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
if len(msg.Params) < 3 {
return newNeedMoreParamsError(msg.Command)
}
ch, err := c.getChannel(msg.Params[1])
if err != nil {
return err
}
if msg.Command == irc.RPL_TOPIC {
ch.Topic = msg.Params[2]
} else {
ch.Topic = ""
}
case "TOPIC":
if len(msg.Params) < 1 {
return newNeedMoreParamsError(msg.Command)
}
ch, err := c.getChannel(msg.Params[0])
if err != nil {
return err
}
if len(msg.Params) > 1 {
ch.Topic = msg.Params[1]
} else {
ch.Topic = ""
}
case rpl_topicwhotime:
if len(msg.Params) < 4 {
return newNeedMoreParamsError(msg.Command)
}
ch, err := c.getChannel(msg.Params[1])
if err != nil {
return err
}
ch.TopicWho = msg.Params[2]
sec, err := strconv.ParseInt(msg.Params[3], 10, 64)
if err != nil {
return fmt.Errorf("failed to parse topic time: %v", err)
}
ch.TopicTime = time.Unix(sec, 0)
case irc.RPL_NAMREPLY:
if len(msg.Params) < 4 {
return newNeedMoreParamsError(msg.Command)
}
ch, err := c.getChannel(msg.Params[2])
if err != nil {
return err
}
status, err := parseChannelStatus(msg.Params[1])
if err != nil {
return err
}
ch.Status = status
for _, s := range strings.Split(msg.Params[3], " ") {
membership, nick := parseMembershipPrefix(s)
ch.Members[nick] = membership
}
case irc.RPL_ENDOFNAMES:
if len(msg.Params) < 2 {
return newNeedMoreParamsError(msg.Command)
}
ch, err := c.getChannel(msg.Params[1])
if err != nil {
return err
}
ch.complete = true
c.srv.lock.Lock()
for _, dc := range c.srv.downstreamConns {
forwardChannel(dc, ch)
}
c.srv.lock.Unlock()
case irc.RPL_YOURHOST, irc.RPL_CREATED:
// Ignore
case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
// Ignore
case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
// Ignore
case rpl_localusers, rpl_globalusers:
// Ignore
case irc.RPL_STATSVLINE, irc.RPL_STATSPING, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
// Ignore
default:
c.logger.Printf("unhandled upstream message: %v", msg)
}
return nil
}
func (c *upstreamConn) readMessages() error {
defer c.Close()
c.messages <- &irc.Message{
Command: "NICK",
Params: []string{c.upstream.Nick},
}
c.messages <- &irc.Message{
Command: "USER",
Params: []string{c.upstream.Username, "0", "*", c.upstream.Realname},
}
for {
msg, err := c.irc.ReadMessage()
if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("failed to read IRC command: %v", err)
}
if err := c.handleMessage(msg); err != nil {
c.logger.Printf("failed to handle message %q: %v", msg, err)
}
}
return c.Close()
}