source: code/trunk/upstream.go@ 64

Last change on this file since 64 was 64, checked in by contact, 5 years ago

Add a -debug flag
File size: 8.1 KB
RevLine 
[13]1package jounce
2
3import (
4 "crypto/tls"
5 "fmt"
6 "io"
7 "net"
[19]8 "strconv"
[17]9 "strings"
[19]10 "time"
[13]11
12 "gopkg.in/irc.v3"
13)
14
[19]15type upstreamChannel struct {
16 Name string
[46]17 conn *upstreamConn
[19]18 Topic string
19 TopicWho string
20 TopicTime time.Time
21 Status channelStatus
[35]22 modes modeSet
[19]23 Members map[string]membership
[25]24 complete bool
[19]25}
26
[13]27type upstreamConn struct {
[19]28 upstream *Upstream
[21]29 logger Logger
[19]30 net net.Conn
31 irc *irc.Conn
32 srv *Server
[37]33 user *user
[33]34 messages chan<- *irc.Message
[50]35 ring *Ring
[16]36
37 serverName string
38 availableUserModes string
39 availableChannelModes string
40 channelModesWithParam string
[19]41
42 registered bool
[42]43 nick string
[33]44 closed bool
[19]45 modes modeSet
46 channels map[string]*upstreamChannel
[57]47 history map[string]uint64
[13]48}
49
[37]50func connectToUpstream(u *user, upstream *Upstream) (*upstreamConn, error) {
51 logger := &prefixLogger{u.srv.Logger, fmt.Sprintf("upstream %q: ", upstream.Addr)}
[33]52 logger.Printf("connecting to server")
53
54 netConn, err := tls.Dial("tcp", upstream.Addr, nil)
55 if err != nil {
56 return nil, fmt.Errorf("failed to dial %q: %v", upstream.Addr, err)
57 }
58
59 msgs := make(chan *irc.Message, 64)
[55]60 uc := &upstreamConn{
[33]61 upstream: upstream,
62 logger: logger,
63 net: netConn,
64 irc: irc.NewConn(netConn),
[37]65 srv: u.srv,
66 user: u,
[33]67 messages: msgs,
[50]68 ring: NewRing(u.srv.RingCap),
[33]69 channels: make(map[string]*upstreamChannel),
[57]70 history: make(map[string]uint64),
[33]71 }
72
73 go func() {
74 for msg := range msgs {
[64]75 if uc.srv.Debug {
76 uc.logger.Printf("sent: %v", msg)
77 }
[55]78 if err := uc.irc.WriteMessage(msg); err != nil {
79 uc.logger.Printf("failed to write message: %v", err)
[33]80 }
81 }
[55]82 if err := uc.net.Close(); err != nil {
83 uc.logger.Printf("failed to close connection: %v", err)
[45]84 } else {
[55]85 uc.logger.Printf("connection closed")
[45]86 }
[33]87 }()
88
[55]89 return uc, nil
[33]90}
91
[55]92func (uc *upstreamConn) Close() error {
93 if uc.closed {
[33]94 return fmt.Errorf("upstream connection already closed")
95 }
[55]96 close(uc.messages)
97 uc.closed = true
[33]98 return nil
99}
100
[55]101func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
102 ch, ok := uc.channels[name]
[19]103 if !ok {
104 return nil, fmt.Errorf("unknown channel %q", name)
105 }
106 return ch, nil
107}
108
[55]109func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
[13]110 switch msg.Command {
111 case "PING":
112 // TODO: handle params
[60]113 uc.SendMessage(&irc.Message{
[13]114 Command: "PONG",
[55]115 Params: []string{uc.srv.Hostname},
[60]116 })
[33]117 return nil
[17]118 case "MODE":
[43]119 var name, modeStr string
120 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
121 return err
[17]122 }
[35]123
124 if name == msg.Prefix.Name { // user mode change
[55]125 if name != uc.nick {
[35]126 return fmt.Errorf("received MODE message for unknow nick %q", name)
127 }
[55]128 return uc.modes.Apply(modeStr)
[35]129 } else { // channel mode change
[55]130 ch, err := uc.getChannel(name)
[35]131 if err != nil {
132 return err
133 }
134 if err := ch.modes.Apply(modeStr); err != nil {
135 return err
136 }
[46]137 }
[35]138
[55]139 uc.user.forEachDownstream(func(dc *downstreamConn) {
[54]140 dc.SendMessage(msg)
[46]141 })
[18]142 case "NOTICE":
[55]143 uc.logger.Print(msg)
[14]144 case irc.RPL_WELCOME:
[55]145 uc.registered = true
146 uc.logger.Printf("connection registered")
[19]147
[55]148 for _, ch := range uc.upstream.Channels {
[60]149 uc.SendMessage(&irc.Message{
[19]150 Command: "JOIN",
151 Params: []string{ch},
[60]152 })
[19]153 }
[16]154 case irc.RPL_MYINFO:
[55]155 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, &uc.availableChannelModes); err != nil {
[43]156 return err
[16]157 }
158 if len(msg.Params) > 5 {
[55]159 uc.channelModesWithParam = msg.Params[5]
[16]160 }
[42]161 case "NICK":
[43]162 var newNick string
163 if err := parseMessageParams(msg, &newNick); err != nil {
164 return err
[42]165 }
166
[55]167 if msg.Prefix.Name == uc.nick {
168 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
169 uc.nick = newNick
[42]170 }
171
[55]172 for _, ch := range uc.channels {
[42]173 if membership, ok := ch.Members[msg.Prefix.Name]; ok {
174 delete(ch.Members, msg.Prefix.Name)
175 ch.Members[newNick] = membership
176 }
177 }
178
[55]179 uc.user.forEachDownstream(func(dc *downstreamConn) {
[54]180 dc.SendMessage(msg)
[42]181 })
[19]182 case "JOIN":
[43]183 var channels string
184 if err := parseMessageParams(msg, &channels); err != nil {
185 return err
[19]186 }
[34]187
[43]188 for _, ch := range strings.Split(channels, ",") {
[55]189 if msg.Prefix.Name == uc.nick {
190 uc.logger.Printf("joined channel %q", ch)
191 uc.channels[ch] = &upstreamChannel{
[34]192 Name: ch,
[55]193 conn: uc,
[34]194 Members: make(map[string]membership),
195 }
196 } else {
[55]197 ch, err := uc.getChannel(ch)
[34]198 if err != nil {
199 return err
200 }
201 ch.Members[msg.Prefix.Name] = 0
[19]202 }
203 }
[34]204
[55]205 uc.user.forEachDownstream(func(dc *downstreamConn) {
[54]206 dc.SendMessage(msg)
[40]207 })
[34]208 case "PART":
[43]209 var channels string
210 if err := parseMessageParams(msg, &channels); err != nil {
211 return err
[34]212 }
213
[43]214 for _, ch := range strings.Split(channels, ",") {
[55]215 if msg.Prefix.Name == uc.nick {
216 uc.logger.Printf("parted channel %q", ch)
217 delete(uc.channels, ch)
[34]218 } else {
[55]219 ch, err := uc.getChannel(ch)
[34]220 if err != nil {
221 return err
222 }
223 delete(ch.Members, msg.Prefix.Name)
224 }
225 }
226
[55]227 uc.user.forEachDownstream(func(dc *downstreamConn) {
[54]228 dc.SendMessage(msg)
[40]229 })
[19]230 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]231 var name, topic string
232 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
233 return err
[19]234 }
[55]235 ch, err := uc.getChannel(name)
[19]236 if err != nil {
237 return err
238 }
239 if msg.Command == irc.RPL_TOPIC {
[43]240 ch.Topic = topic
[19]241 } else {
242 ch.Topic = ""
243 }
244 case "TOPIC":
[43]245 var name string
246 if err := parseMessageParams(msg, nil, &name); err != nil {
247 return err
[19]248 }
[55]249 ch, err := uc.getChannel(name)
[19]250 if err != nil {
251 return err
252 }
253 if len(msg.Params) > 1 {
254 ch.Topic = msg.Params[1]
255 } else {
256 ch.Topic = ""
257 }
258 case rpl_topicwhotime:
[43]259 var name, who, timeStr string
260 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
261 return err
[19]262 }
[55]263 ch, err := uc.getChannel(name)
[19]264 if err != nil {
265 return err
266 }
[43]267 ch.TopicWho = who
268 sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]269 if err != nil {
270 return fmt.Errorf("failed to parse topic time: %v", err)
271 }
272 ch.TopicTime = time.Unix(sec, 0)
273 case irc.RPL_NAMREPLY:
[43]274 var name, statusStr, members string
275 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
276 return err
[19]277 }
[55]278 ch, err := uc.getChannel(name)
[19]279 if err != nil {
280 return err
281 }
282
[43]283 status, err := parseChannelStatus(statusStr)
[19]284 if err != nil {
285 return err
286 }
287 ch.Status = status
288
[43]289 for _, s := range strings.Split(members, " ") {
[19]290 membership, nick := parseMembershipPrefix(s)
291 ch.Members[nick] = membership
292 }
293 case irc.RPL_ENDOFNAMES:
[43]294 var name string
295 if err := parseMessageParams(msg, nil, &name); err != nil {
296 return err
[25]297 }
[55]298 ch, err := uc.getChannel(name)
[25]299 if err != nil {
300 return err
301 }
302
[34]303 if ch.complete {
304 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
305 }
[25]306 ch.complete = true
[27]307
[55]308 uc.user.forEachDownstream(func(dc *downstreamConn) {
[27]309 forwardChannel(dc, ch)
[40]310 })
[36]311 case "PRIVMSG":
[55]312 uc.ring.Produce(msg)
[16]313 case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]314 // Ignore
315 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
316 // Ignore
317 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
318 // Ignore
319 case rpl_localusers, rpl_globalusers:
320 // Ignore
321 case irc.RPL_STATSVLINE, irc.RPL_STATSPING, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
322 // Ignore
[13]323 default:
[55]324 uc.logger.Printf("unhandled upstream message: %v", msg)
[13]325 }
[14]326 return nil
[13]327}
328
[55]329func (uc *upstreamConn) register() {
330 uc.nick = uc.upstream.Nick
[60]331 uc.SendMessage(&irc.Message{
[13]332 Command: "NICK",
[55]333 Params: []string{uc.upstream.Nick},
[60]334 })
335 uc.SendMessage(&irc.Message{
[13]336 Command: "USER",
[55]337 Params: []string{uc.upstream.Username, "0", "*", uc.upstream.Realname},
[60]338 })
[44]339}
[13]340
[55]341func (uc *upstreamConn) readMessages() error {
[13]342 for {
[55]343 msg, err := uc.irc.ReadMessage()
[13]344 if err == io.EOF {
345 break
346 } else if err != nil {
347 return fmt.Errorf("failed to read IRC command: %v", err)
348 }
349
[64]350 if uc.srv.Debug {
351 uc.logger.Printf("received: %v", msg)
352 }
353
[55]354 if err := uc.handleMessage(msg); err != nil {
355 uc.logger.Printf("failed to handle message %q: %v", msg, err)
[13]356 }
357 }
358
[45]359 return nil
[13]360}
[60]361
362func (uc *upstreamConn) SendMessage(msg *irc.Message) {
363 uc.messages <- msg
364}
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