source: code/trunk/downstream.go@ 51

Last change on this file since 51 was 51, checked in by contact, 5 years ago

Add names to consumers
File size: 7.4 KB
Line 
1package jounce
2
3import (
4 "fmt"
5 "io"
6 "net"
7 "strings"
8
9 "gopkg.in/irc.v3"
10)
11
12type ircError struct {
13 Message *irc.Message
14}
15
16func newUnknownCommandError(cmd string) ircError {
17 return ircError{&irc.Message{
18 Command: irc.ERR_UNKNOWNCOMMAND,
19 Params: []string{
20 "*",
21 cmd,
22 "Unknown command",
23 },
24 }}
25}
26
27func newNeedMoreParamsError(cmd string) ircError {
28 return ircError{&irc.Message{
29 Command: irc.ERR_NEEDMOREPARAMS,
30 Params: []string{
31 "*",
32 cmd,
33 "Not enough parameters",
34 },
35 }}
36}
37
38func (err ircError) Error() string {
39 return err.Message.String()
40}
41
42type downstreamConn struct {
43 net net.Conn
44 irc *irc.Conn
45 srv *Server
46 logger Logger
47 messages chan<- *irc.Message
48
49 registered bool
50 user *user
51 closed bool
52 nick string
53 username string
54 realname string
55}
56
57func newDownstreamConn(srv *Server, netConn net.Conn) *downstreamConn {
58 msgs := make(chan *irc.Message, 64)
59 conn := &downstreamConn{
60 net: netConn,
61 irc: irc.NewConn(netConn),
62 srv: srv,
63 logger: &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())},
64 messages: msgs,
65 }
66
67 go func() {
68 for msg := range msgs {
69 if err := conn.irc.WriteMessage(msg); err != nil {
70 conn.logger.Printf("failed to write message: %v", err)
71 }
72 }
73 if err := conn.net.Close(); err != nil {
74 conn.logger.Printf("failed to close connection: %v", err)
75 } else {
76 conn.logger.Printf("connection closed")
77 }
78 }()
79
80 return conn
81}
82
83func (c *downstreamConn) prefix() *irc.Prefix {
84 return &irc.Prefix{
85 Name: c.nick,
86 User: c.username,
87 // TODO: fill the host?
88 }
89}
90
91func (c *downstreamConn) readMessages() error {
92 c.logger.Printf("new connection")
93
94 for {
95 msg, err := c.irc.ReadMessage()
96 if err == io.EOF {
97 break
98 } else if err != nil {
99 return fmt.Errorf("failed to read IRC command: %v", err)
100 }
101
102 err = c.handleMessage(msg)
103 if ircErr, ok := err.(ircError); ok {
104 ircErr.Message.Prefix = c.srv.prefix()
105 c.messages <- ircErr.Message
106 } else if err != nil {
107 return fmt.Errorf("failed to handle IRC command %q: %v", msg.Command, err)
108 }
109
110 if c.closed {
111 return nil
112 }
113 }
114
115 return nil
116}
117
118func (c *downstreamConn) Close() error {
119 if c.closed {
120 return fmt.Errorf("downstream connection already closed")
121 }
122
123 if u := c.user; u != nil {
124 u.lock.Lock()
125 for i := range u.downstreamConns {
126 if u.downstreamConns[i] == c {
127 u.downstreamConns = append(u.downstreamConns[:i], u.downstreamConns[i+1:]...)
128 }
129 }
130 u.lock.Unlock()
131
132 // TODO: figure out a better way to advance the ring buffer consumer cursor
133 u.forEachUpstream(func(uc *upstreamConn) {
134 // TODO: let clients specify the ring buffer name in their username
135 uc.ring.Consumer("").Reset()
136 })
137 }
138
139 close(c.messages)
140 c.closed = true
141
142 return nil
143}
144
145func (c *downstreamConn) handleMessage(msg *irc.Message) error {
146 switch msg.Command {
147 case "QUIT":
148 return c.Close()
149 case "PING":
150 // TODO: handle params
151 c.messages <- &irc.Message{
152 Prefix: c.srv.prefix(),
153 Command: "PONG",
154 Params: []string{c.srv.Hostname},
155 }
156 return nil
157 default:
158 if c.registered {
159 return c.handleMessageRegistered(msg)
160 } else {
161 return c.handleMessageUnregistered(msg)
162 }
163 }
164}
165
166func (c *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
167 switch msg.Command {
168 case "NICK":
169 if err := parseMessageParams(msg, &c.nick); err != nil {
170 return err
171 }
172 case "USER":
173 var username string
174 if err := parseMessageParams(msg, &username, nil, nil, &c.realname); err != nil {
175 return err
176 }
177 c.username = "~" + username
178 default:
179 c.logger.Printf("unhandled message: %v", msg)
180 return newUnknownCommandError(msg.Command)
181 }
182 if c.username != "" && c.nick != "" {
183 return c.register()
184 }
185 return nil
186}
187
188func (c *downstreamConn) register() error {
189 u := c.srv.getUser(strings.TrimPrefix(c.username, "~"))
190 if u == nil {
191 c.logger.Printf("failed authentication: unknown username %q", c.username)
192 c.messages <- &irc.Message{
193 Prefix: c.srv.prefix(),
194 Command: irc.ERR_PASSWDMISMATCH,
195 Params: []string{"*", "Invalid username or password"},
196 }
197 return nil
198 }
199
200 c.registered = true
201 c.user = u
202
203 u.lock.Lock()
204 u.downstreamConns = append(u.downstreamConns, c)
205 u.lock.Unlock()
206
207 c.messages <- &irc.Message{
208 Prefix: c.srv.prefix(),
209 Command: irc.RPL_WELCOME,
210 Params: []string{c.nick, "Welcome to jounce, " + c.nick},
211 }
212 c.messages <- &irc.Message{
213 Prefix: c.srv.prefix(),
214 Command: irc.RPL_YOURHOST,
215 Params: []string{c.nick, "Your host is " + c.srv.Hostname},
216 }
217 c.messages <- &irc.Message{
218 Prefix: c.srv.prefix(),
219 Command: irc.RPL_CREATED,
220 Params: []string{c.nick, "Who cares when the server was created?"},
221 }
222 c.messages <- &irc.Message{
223 Prefix: c.srv.prefix(),
224 Command: irc.RPL_MYINFO,
225 Params: []string{c.nick, c.srv.Hostname, "jounce", "aiwroO", "OovaimnqpsrtklbeI"},
226 }
227 c.messages <- &irc.Message{
228 Prefix: c.srv.prefix(),
229 Command: irc.ERR_NOMOTD,
230 Params: []string{c.nick, "No MOTD"},
231 }
232
233 u.forEachUpstream(func(uc *upstreamConn) {
234 // TODO: fix races accessing upstream connection data
235 for _, ch := range uc.channels {
236 if ch.complete {
237 forwardChannel(c, ch)
238 }
239 }
240
241 // TODO: let clients specify the ring buffer name in their username
242 consumer := uc.ring.Consumer("")
243 for {
244 // TODO: these messages will get lost if the connection is closed
245 msg := consumer.Consume()
246 if msg == nil {
247 break
248 }
249 c.messages <- msg
250 }
251 })
252
253 return nil
254}
255
256func (c *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
257 switch msg.Command {
258 case "USER":
259 return ircError{&irc.Message{
260 Command: irc.ERR_ALREADYREGISTERED,
261 Params: []string{c.nick, "You may not reregister"},
262 }}
263 case "NICK":
264 c.user.forEachUpstream(func(uc *upstreamConn) {
265 uc.messages <- msg
266 })
267 case "JOIN":
268 var name string
269 if err := parseMessageParams(msg, &name); err != nil {
270 return err
271 }
272
273 if ch, _ := c.user.getChannel(name); ch != nil {
274 break // already joined
275 }
276
277 // TODO: extract network name from channel name
278 return ircError{&irc.Message{
279 Command: irc.ERR_NOSUCHCHANNEL,
280 Params: []string{name, "Channel name ambiguous"},
281 }}
282 case "PART":
283 var name string
284 if err := parseMessageParams(msg, &name); err != nil {
285 return err
286 }
287
288 ch, err := c.user.getChannel(name)
289 if err != nil {
290 return err
291 }
292
293 ch.conn.messages <- msg
294 // TODO: remove channel from upstream config
295 case "MODE":
296 var name string
297 if err := parseMessageParams(msg, &name); err != nil {
298 return err
299 }
300
301 var modeStr string
302 if len(msg.Params) > 1 {
303 modeStr = msg.Params[1]
304 }
305
306 if msg.Prefix.Name != name {
307 ch, err := c.user.getChannel(name)
308 if err != nil {
309 return err
310 }
311
312 if modeStr != "" {
313 ch.conn.messages <- msg
314 } else {
315 c.messages <- &irc.Message{
316 Prefix: c.srv.prefix(),
317 Command: irc.RPL_CHANNELMODEIS,
318 Params: []string{ch.Name, string(ch.modes)},
319 }
320 }
321 } else {
322 if name != c.nick {
323 return ircError{&irc.Message{
324 Command: irc.ERR_USERSDONTMATCH,
325 Params: []string{c.nick, "Cannot change mode for other users"},
326 }}
327 }
328
329 if modeStr != "" {
330 c.user.forEachUpstream(func(uc *upstreamConn) {
331 uc.messages <- msg
332 })
333 } else {
334 c.messages <- &irc.Message{
335 Prefix: c.srv.prefix(),
336 Command: irc.RPL_UMODEIS,
337 Params: []string{""}, // TODO
338 }
339 }
340 }
341 default:
342 c.logger.Printf("unhandled message: %v", msg)
343 return newUnknownCommandError(msg.Command)
344 }
345 return nil
346}
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