source: code/trunk/upstream.go@ 72

Last change on this file since 72 was 72, checked in by contact, 5 years ago

Remove upstream prefix for outgoing MODE and PRIVMSG

We shouldn't set the prefix when sending these commands.
File size: 8.7 KB
Line 
1package jounce
2
3import (
4 "crypto/tls"
5 "fmt"
6 "io"
7 "net"
8 "strconv"
9 "strings"
10 "time"
11
12 "gopkg.in/irc.v3"
13)
14
15type upstreamChannel struct {
16 Name string
17 conn *upstreamConn
18 Topic string
19 TopicWho string
20 TopicTime time.Time
21 Status channelStatus
22 modes modeSet
23 Members map[string]membership
24 complete bool
25}
26
27type upstreamConn struct {
28 upstream *Upstream
29 logger Logger
30 net net.Conn
31 irc *irc.Conn
32 srv *Server
33 user *user
34 messages chan<- *irc.Message
35 ring *Ring
36
37 serverName string
38 availableUserModes string
39 availableChannelModes string
40 channelModesWithParam string
41
42 registered bool
43 nick string
44 closed bool
45 modes modeSet
46 channels map[string]*upstreamChannel
47 history map[string]uint64
48}
49
50func connectToUpstream(u *user, upstream *Upstream) (*upstreamConn, error) {
51 logger := &prefixLogger{u.srv.Logger, fmt.Sprintf("upstream %q: ", upstream.Addr)}
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 setKeepAlive(netConn)
60
61 msgs := make(chan *irc.Message, 64)
62 uc := &upstreamConn{
63 upstream: upstream,
64 logger: logger,
65 net: netConn,
66 irc: irc.NewConn(netConn),
67 srv: u.srv,
68 user: u,
69 messages: msgs,
70 ring: NewRing(u.srv.RingCap),
71 channels: make(map[string]*upstreamChannel),
72 history: make(map[string]uint64),
73 }
74
75 go func() {
76 for msg := range msgs {
77 if uc.srv.Debug {
78 uc.logger.Printf("sent: %v", msg)
79 }
80 if err := uc.irc.WriteMessage(msg); err != nil {
81 uc.logger.Printf("failed to write message: %v", err)
82 }
83 }
84 if err := uc.net.Close(); err != nil {
85 uc.logger.Printf("failed to close connection: %v", err)
86 } else {
87 uc.logger.Printf("connection closed")
88 }
89 }()
90
91 return uc, nil
92}
93
94func (uc *upstreamConn) Close() error {
95 if uc.closed {
96 return fmt.Errorf("upstream connection already closed")
97 }
98 close(uc.messages)
99 uc.closed = true
100 return nil
101}
102
103func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
104 ch, ok := uc.channels[name]
105 if !ok {
106 return nil, fmt.Errorf("unknown channel %q", name)
107 }
108 return ch, nil
109}
110
111func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
112 switch msg.Command {
113 case "PING":
114 uc.SendMessage(&irc.Message{
115 Command: "PONG",
116 Params: msg.Params,
117 })
118 return nil
119 case "MODE":
120 if msg.Prefix == nil {
121 return fmt.Errorf("missing prefix")
122 }
123
124 var name, modeStr string
125 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
126 return err
127 }
128
129 if name == msg.Prefix.Name { // user mode change
130 if name != uc.nick {
131 return fmt.Errorf("received MODE message for unknow nick %q", name)
132 }
133 return uc.modes.Apply(modeStr)
134 } else { // channel mode change
135 ch, err := uc.getChannel(name)
136 if err != nil {
137 return err
138 }
139 if err := ch.modes.Apply(modeStr); err != nil {
140 return err
141 }
142
143 uc.user.forEachDownstream(func(dc *downstreamConn) {
144 dc.SendMessage(&irc.Message{
145 Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
146 Command: "MODE",
147 Params: []string{dc.marshalChannel(uc, name), modeStr},
148 })
149 })
150 }
151 case "NOTICE":
152 uc.logger.Print(msg)
153 case irc.RPL_WELCOME:
154 uc.registered = true
155 uc.logger.Printf("connection registered")
156
157 for _, ch := range uc.upstream.Channels {
158 uc.SendMessage(&irc.Message{
159 Command: "JOIN",
160 Params: []string{ch},
161 })
162 }
163 case irc.RPL_MYINFO:
164 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, &uc.availableChannelModes); err != nil {
165 return err
166 }
167 if len(msg.Params) > 5 {
168 uc.channelModesWithParam = msg.Params[5]
169 }
170 case "NICK":
171 var newNick string
172 if err := parseMessageParams(msg, &newNick); err != nil {
173 return err
174 }
175
176 if msg.Prefix.Name == uc.nick {
177 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
178 uc.nick = newNick
179 }
180
181 for _, ch := range uc.channels {
182 if membership, ok := ch.Members[msg.Prefix.Name]; ok {
183 delete(ch.Members, msg.Prefix.Name)
184 ch.Members[newNick] = membership
185 }
186 }
187 case "JOIN":
188 if msg.Prefix == nil {
189 return fmt.Errorf("expected a prefix")
190 }
191
192 var channels string
193 if err := parseMessageParams(msg, &channels); err != nil {
194 return err
195 }
196
197 for _, ch := range strings.Split(channels, ",") {
198 if msg.Prefix.Name == uc.nick {
199 uc.logger.Printf("joined channel %q", ch)
200 uc.channels[ch] = &upstreamChannel{
201 Name: ch,
202 conn: uc,
203 Members: make(map[string]membership),
204 }
205 } else {
206 ch, err := uc.getChannel(ch)
207 if err != nil {
208 return err
209 }
210 ch.Members[msg.Prefix.Name] = 0
211 }
212
213 uc.user.forEachDownstream(func(dc *downstreamConn) {
214 dc.SendMessage(&irc.Message{
215 Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
216 Command: "JOIN",
217 Params: []string{dc.marshalChannel(uc, ch)},
218 })
219 })
220 }
221 case "PART":
222 if msg.Prefix == nil {
223 return fmt.Errorf("expected a prefix")
224 }
225
226 var channels string
227 if err := parseMessageParams(msg, &channels); err != nil {
228 return err
229 }
230
231 for _, ch := range strings.Split(channels, ",") {
232 if msg.Prefix.Name == uc.nick {
233 uc.logger.Printf("parted channel %q", ch)
234 delete(uc.channels, ch)
235 } else {
236 ch, err := uc.getChannel(ch)
237 if err != nil {
238 return err
239 }
240 delete(ch.Members, msg.Prefix.Name)
241 }
242
243 uc.user.forEachDownstream(func(dc *downstreamConn) {
244 dc.SendMessage(&irc.Message{
245 Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
246 Command: "PART",
247 Params: []string{dc.marshalChannel(uc, ch)},
248 })
249 })
250 }
251 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
252 var name, topic string
253 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
254 return err
255 }
256 ch, err := uc.getChannel(name)
257 if err != nil {
258 return err
259 }
260 if msg.Command == irc.RPL_TOPIC {
261 ch.Topic = topic
262 } else {
263 ch.Topic = ""
264 }
265 case "TOPIC":
266 var name string
267 if err := parseMessageParams(msg, nil, &name); err != nil {
268 return err
269 }
270 ch, err := uc.getChannel(name)
271 if err != nil {
272 return err
273 }
274 if len(msg.Params) > 1 {
275 ch.Topic = msg.Params[1]
276 } else {
277 ch.Topic = ""
278 }
279 case rpl_topicwhotime:
280 var name, who, timeStr string
281 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
282 return err
283 }
284 ch, err := uc.getChannel(name)
285 if err != nil {
286 return err
287 }
288 ch.TopicWho = who
289 sec, err := strconv.ParseInt(timeStr, 10, 64)
290 if err != nil {
291 return fmt.Errorf("failed to parse topic time: %v", err)
292 }
293 ch.TopicTime = time.Unix(sec, 0)
294 case irc.RPL_NAMREPLY:
295 var name, statusStr, members string
296 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
297 return err
298 }
299 ch, err := uc.getChannel(name)
300 if err != nil {
301 return err
302 }
303
304 status, err := parseChannelStatus(statusStr)
305 if err != nil {
306 return err
307 }
308 ch.Status = status
309
310 for _, s := range strings.Split(members, " ") {
311 membership, nick := parseMembershipPrefix(s)
312 ch.Members[nick] = membership
313 }
314 case irc.RPL_ENDOFNAMES:
315 var name string
316 if err := parseMessageParams(msg, nil, &name); err != nil {
317 return err
318 }
319 ch, err := uc.getChannel(name)
320 if err != nil {
321 return err
322 }
323
324 if ch.complete {
325 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
326 }
327 ch.complete = true
328
329 uc.user.forEachDownstream(func(dc *downstreamConn) {
330 forwardChannel(dc, ch)
331 })
332 case "PRIVMSG":
333 if err := parseMessageParams(msg, nil, nil); err != nil {
334 return err
335 }
336 uc.ring.Produce(msg)
337 case irc.RPL_YOURHOST, irc.RPL_CREATED:
338 // Ignore
339 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
340 // Ignore
341 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
342 // Ignore
343 case rpl_localusers, rpl_globalusers:
344 // Ignore
345 case irc.RPL_STATSVLINE, irc.RPL_STATSPING, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
346 // Ignore
347 default:
348 uc.logger.Printf("unhandled upstream message: %v", msg)
349 }
350 return nil
351}
352
353func (uc *upstreamConn) register() {
354 uc.nick = uc.upstream.Nick
355 uc.SendMessage(&irc.Message{
356 Command: "NICK",
357 Params: []string{uc.nick},
358 })
359 uc.SendMessage(&irc.Message{
360 Command: "USER",
361 Params: []string{uc.upstream.Username, "0", "*", uc.upstream.Realname},
362 })
363}
364
365func (uc *upstreamConn) readMessages() error {
366 for {
367 msg, err := uc.irc.ReadMessage()
368 if err == io.EOF {
369 break
370 } else if err != nil {
371 return fmt.Errorf("failed to read IRC command: %v", err)
372 }
373
374 if uc.srv.Debug {
375 uc.logger.Printf("received: %v", msg)
376 }
377
378 if err := uc.handleMessage(msg); err != nil {
379 uc.logger.Printf("failed to handle message %q: %v", msg, err)
380 }
381 }
382
383 return nil
384}
385
386func (uc *upstreamConn) SendMessage(msg *irc.Message) {
387 uc.messages <- msg
388}
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