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source: code/trunk/downstream.go@ 69

Last change on this file since 69 was 69, checked in by contact, 5 years ago
Add functions to translate between upstream and downstream names
File size: 10.3 KB

Rev	Line
[13]	1	package jounce
	2
	3	import (
	4	"fmt"
	5	"io"
	6	"net"
[39]	7	"strings"
[13]	8
	9	"gopkg.in/irc.v3"
	10	)
	11
	12	type ircError struct {
	13	Message *irc.Message
	14	}
	15
	16	func 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
	27	func 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
	38	func (err ircError) Error() string {
	39	return err.Message.String()
	40	}
	41
[69]	42	type consumption struct {
	43	consumer *RingConsumer
	44	upstreamConn *upstreamConn
	45	}
	46
[13]	47	type downstreamConn struct {
[69]	48	net net.Conn
	49	irc *irc.Conn
	50	srv *Server
	51	logger Logger
	52	messages chan *irc.Message
	53	consumptions chan consumption
	54	closed chan struct{}
[22]	55
[13]	56	registered bool
[37]	57	user *user
[13]	58	nick string
	59	username string
	60	realname string
	61	}
	62
[22]	63	func newDownstreamConn(srv Server, netConn net.Conn) downstreamConn {
[55]	64	dc := &downstreamConn{
[69]	65	net: netConn,
	66	irc: irc.NewConn(netConn),
	67	srv: srv,
	68	logger: &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", netConn.RemoteAddr())},
	69	messages: make(chan *irc.Message, 64),
	70	consumptions: make(chan consumption),
	71	closed: make(chan struct{}),
[22]	72	}
[26]	73
	74	go func() {
[56]	75	if err := dc.writeMessages(); err != nil {
	76	dc.logger.Printf("failed to write message: %v", err)
[26]	77	}
[55]	78	if err := dc.net.Close(); err != nil {
	79	dc.logger.Printf("failed to close connection: %v", err)
[45]	80	} else {
[55]	81	dc.logger.Printf("connection closed")
[45]	82	}
[26]	83	}()
	84
[55]	85	return dc
[22]	86	}
	87
[55]	88	func (dc downstreamConn) prefix() irc.Prefix {
[27]	89	return &irc.Prefix{
[55]	90	Name: dc.nick,
	91	User: dc.username,
[27]	92	// TODO: fill the host?
	93	}
	94	}
	95
[69]	96	func (dc downstreamConn) marshalChannel(uc upstreamConn, name string) string {
	97	return name
	98	}
	99
	100	func (dc downstreamConn) unmarshalChannel(name string) (upstreamConn, string, error) {
	101	// TODO: extract network name from channel name
	102	ch, err := dc.user.getChannel(name)
	103	if err != nil {
	104	return nil, "", err
	105	}
	106	return ch.conn, ch.Name, nil
	107	}
	108
	109	func (dc downstreamConn) marshalNick(uc upstreamConn, nick string) string {
	110	if nick == uc.nick {
	111	return dc.nick
	112	}
	113	return nick
	114	}
	115
	116	func (dc downstreamConn) marshalUserPrefix(uc upstreamConn, prefix irc.Prefix) irc.Prefix {
	117	if prefix.Name == uc.nick {
	118	return dc.prefix()
	119	}
	120	return prefix
	121	}
	122
[57]	123	func (dc *downstreamConn) isClosed() bool {
	124	select {
	125	case <-dc.closed:
	126	return true
	127	default:
	128	return false
	129	}
	130	}
	131
[55]	132	func (dc *downstreamConn) readMessages() error {
	133	dc.logger.Printf("new connection")
[22]	134
	135	for {
[55]	136	msg, err := dc.irc.ReadMessage()
[22]	137	if err == io.EOF {
	138	break
	139	} else if err != nil {
	140	return fmt.Errorf("failed to read IRC command: %v", err)
	141	}
	142
[64]	143	if dc.srv.Debug {
	144	dc.logger.Printf("received: %v", msg)
	145	}
	146
[55]	147	err = dc.handleMessage(msg)
[22]	148	if ircErr, ok := err.(ircError); ok {
[55]	149	ircErr.Message.Prefix = dc.srv.prefix()
	150	dc.SendMessage(ircErr.Message)
[22]	151	} else if err != nil {
	152	return fmt.Errorf("failed to handle IRC command %q: %v", msg.Command, err)
	153	}
	154
[57]	155	if dc.isClosed() {
[22]	156	return nil
	157	}
	158	}
	159
[45]	160	return nil
[22]	161	}
	162
[56]	163	func (dc *downstreamConn) writeMessages() error {
[57]	164	for {
	165	var err error
	166	var closed bool
	167	select {
	168	case msg := <-dc.messages:
[64]	169	if dc.srv.Debug {
	170	dc.logger.Printf("sent: %v", msg)
	171	}
[57]	172	err = dc.irc.WriteMessage(msg)
[69]	173	case consumption := <-dc.consumptions:
	174	consumer, uc := consumption.consumer, consumption.upstreamConn
[57]	175	for {
	176	msg := consumer.Peek()
	177	if msg == nil {
	178	break
	179	}
[69]	180	msg = msg.Copy()
	181	switch msg.Command {
	182	case "PRIVMSG":
	183	// TODO: detect whether it's a user or a channel
	184	msg.Params[0] = dc.marshalChannel(uc, msg.Params[0])
	185	default:
	186	panic("expected to consume a PRIVMSG message")
	187	}
[64]	188	if dc.srv.Debug {
	189	dc.logger.Printf("sent: %v", msg)
	190	}
[57]	191	err = dc.irc.WriteMessage(msg)
	192	if err != nil {
	193	break
	194	}
	195	consumer.Consume()
	196	}
	197	case <-dc.closed:
	198	closed = true
	199	}
	200	if err != nil {
[56]	201	return err
	202	}
[57]	203	if closed {
	204	break
	205	}
[56]	206	}
	207	return nil
	208	}
	209
[55]	210	func (dc *downstreamConn) Close() error {
[57]	211	if dc.isClosed() {
[26]	212	return fmt.Errorf("downstream connection already closed")
	213	}
[40]	214
[55]	215	if u := dc.user; u != nil {
[40]	216	u.lock.Lock()
	217	for i := range u.downstreamConns {
[55]	218	if u.downstreamConns[i] == dc {
[40]	219	u.downstreamConns = append(u.downstreamConns[:i], u.downstreamConns[i+1:]...)
[63]	220	break
[40]	221	}
	222	}
	223	u.lock.Unlock()
[13]	224	}
[40]	225
[57]	226	close(dc.closed)
[45]	227	return nil
[13]	228	}
	229
[55]	230	func (dc downstreamConn) SendMessage(msg irc.Message) {
	231	dc.messages <- msg
[54]	232	}
	233
[55]	234	func (dc downstreamConn) handleMessage(msg irc.Message) error {
[13]	235	switch msg.Command {
[28]	236	case "QUIT":
[55]	237	return dc.Close()
[13]	238	case "PING":
[55]	239	dc.SendMessage(&irc.Message{
	240	Prefix: dc.srv.prefix(),
[13]	241	Command: "PONG",
[68]	242	Params: msg.Params,
[54]	243	})
[26]	244	return nil
[13]	245	default:
[55]	246	if dc.registered {
	247	return dc.handleMessageRegistered(msg)
[13]	248	} else {
[55]	249	return dc.handleMessageUnregistered(msg)
[13]	250	}
	251	}
	252	}
	253
[55]	254	func (dc downstreamConn) handleMessageUnregistered(msg irc.Message) error {
[13]	255	switch msg.Command {
	256	case "NICK":
[55]	257	if err := parseMessageParams(msg, &dc.nick); err != nil {
[43]	258	return err
[13]	259	}
	260	case "USER":
[43]	261	var username string
[55]	262	if err := parseMessageParams(msg, &username, nil, nil, &dc.realname); err != nil {
[43]	263	return err
[13]	264	}
[55]	265	dc.username = "~" + username
[13]	266	default:
[55]	267	dc.logger.Printf("unhandled message: %v", msg)
[13]	268	return newUnknownCommandError(msg.Command)
	269	}
[55]	270	if dc.username != "" && dc.nick != "" {
	271	return dc.register()
[13]	272	}
	273	return nil
	274	}
	275
[55]	276	func (dc *downstreamConn) register() error {
	277	u := dc.srv.getUser(strings.TrimPrefix(dc.username, "~"))
[38]	278	if u == nil {
[55]	279	dc.logger.Printf("failed authentication: unknown username %q", dc.username)
	280	dc.SendMessage(&irc.Message{
	281	Prefix: dc.srv.prefix(),
[37]	282	Command: irc.ERR_PASSWDMISMATCH,
	283	Params: []string{"*", "Invalid username or password"},
[54]	284	})
[37]	285	return nil
	286	}
	287
[55]	288	dc.registered = true
	289	dc.user = u
[13]	290
[40]	291	u.lock.Lock()
[57]	292	firstDownstream := len(u.downstreamConns) == 0
[55]	293	u.downstreamConns = append(u.downstreamConns, dc)
[40]	294	u.lock.Unlock()
	295
[55]	296	dc.SendMessage(&irc.Message{
	297	Prefix: dc.srv.prefix(),
[13]	298	Command: irc.RPL_WELCOME,
[55]	299	Params: []string{dc.nick, "Welcome to jounce, " + dc.nick},
[54]	300	})
[55]	301	dc.SendMessage(&irc.Message{
	302	Prefix: dc.srv.prefix(),
[13]	303	Command: irc.RPL_YOURHOST,
[55]	304	Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
[54]	305	})
[55]	306	dc.SendMessage(&irc.Message{
	307	Prefix: dc.srv.prefix(),
[13]	308	Command: irc.RPL_CREATED,
[55]	309	Params: []string{dc.nick, "Who cares when the server was created?"},
[54]	310	})
[55]	311	dc.SendMessage(&irc.Message{
	312	Prefix: dc.srv.prefix(),
[13]	313	Command: irc.RPL_MYINFO,
[55]	314	Params: []string{dc.nick, dc.srv.Hostname, "jounce", "aiwroO", "OovaimnqpsrtklbeI"},
[54]	315	})
[55]	316	dc.SendMessage(&irc.Message{
	317	Prefix: dc.srv.prefix(),
[13]	318	Command: irc.ERR_NOMOTD,
[55]	319	Params: []string{dc.nick, "No MOTD"},
[54]	320	})
[13]	321
[39]	322	u.forEachUpstream(func(uc *upstreamConn) {
[30]	323	// TODO: fix races accessing upstream connection data
	324	for _, ch := range uc.channels {
	325	if ch.complete {
[55]	326	forwardChannel(dc, ch)
[30]	327	}
	328	}
[50]	329
[51]	330	// TODO: let clients specify the ring buffer name in their username
[57]	331	historyName := ""
	332
	333	var seqPtr *uint64
	334	if firstDownstream {
	335	seq, ok := uc.history[historyName]
	336	if ok {
	337	seqPtr = &seq
[50]	338	}
	339	}
[57]	340
[59]	341	consumer, ch := uc.ring.NewConsumer(seqPtr)
[57]	342	go func() {
	343	for {
	344	var closed bool
	345	select {
	346	case <-ch:
[69]	347	dc.consumptions <- consumption{consumer, uc}
[57]	348	case <-dc.closed:
	349	closed = true
	350	}
	351	if closed {
	352	break
	353	}
	354	}
	355
	356	seq := consumer.Close()
	357
	358	dc.user.lock.Lock()
	359	lastDownstream := len(dc.user.downstreamConns) == 0
	360	dc.user.lock.Unlock()
	361
	362	if lastDownstream {
	363	uc.history[historyName] = seq
	364	}
	365	}()
[39]	366	})
[50]	367
[13]	368	return nil
	369	}
	370
[55]	371	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	372	switch msg.Command {
[42]	373	case "USER":
[13]	374	return ircError{&irc.Message{
	375	Command: irc.ERR_ALREADYREGISTERED,
[55]	376	Params: []string{dc.nick, "You may not reregister"},
[13]	377	}}
[42]	378	case "NICK":
[55]	379	dc.user.forEachUpstream(func(uc *upstreamConn) {
[60]	380	uc.SendMessage(msg)
[42]	381	})
[69]	382	case "JOIN", "PART":
[48]	383	var name string
	384	if err := parseMessageParams(msg, &name); err != nil {
	385	return err
	386	}
	387
[69]	388	uc, upstreamName, err := dc.unmarshalChannel(name)
	389	if err != nil {
	390	return ircError{&irc.Message{
	391	Command: irc.ERR_NOSUCHCHANNEL,
	392	Params: []string{name, err.Error()},
	393	}}
[48]	394	}
	395
[69]	396	uc.SendMessage(&irc.Message{
	397	Command: msg.Command,
	398	Params: []string{upstreamName},
	399	})
	400	// TODO: add/remove channel from upstream config
	401	case "MODE":
	402	if msg.Prefix == nil {
	403	return fmt.Errorf("missing prefix")
[49]	404	}
	405
[46]	406	var name string
	407	if err := parseMessageParams(msg, &name); err != nil {
	408	return err
	409	}
	410
	411	var modeStr string
	412	if len(msg.Params) > 1 {
	413	modeStr = msg.Params[1]
	414	}
	415
	416	if msg.Prefix.Name != name {
[69]	417	uc, upstreamName, err := dc.unmarshalChannel(name)
[46]	418	if err != nil {
	419	return err
	420	}
	421
	422	if modeStr != "" {
[69]	423	uc.SendMessage(&irc.Message{
	424	Prefix: uc.prefix(),
	425	Command: "MODE",
	426	Params: []string{upstreamName, modeStr},
	427	})
[46]	428	} else {
[69]	429	ch, ok := uc.channels[upstreamName]
	430	if !ok {
	431	return ircError{&irc.Message{
	432	Command: irc.ERR_NOSUCHCHANNEL,
	433	Params: []string{name, "No such channel"},
	434	}}
	435	}
	436
[55]	437	dc.SendMessage(&irc.Message{
	438	Prefix: dc.srv.prefix(),
[46]	439	Command: irc.RPL_CHANNELMODEIS,
[69]	440	Params: []string{name, string(ch.modes)},
[54]	441	})
[46]	442	}
	443	} else {
[55]	444	if name != dc.nick {
[46]	445	return ircError{&irc.Message{
	446	Command: irc.ERR_USERSDONTMATCH,
[55]	447	Params: []string{dc.nick, "Cannot change mode for other users"},
[46]	448	}}
	449	}
	450
	451	if modeStr != "" {
[55]	452	dc.user.forEachUpstream(func(uc *upstreamConn) {
[69]	453	uc.SendMessage(&irc.Message{
	454	Prefix: uc.prefix(),
	455	Command: "MODE",
	456	Params: []string{uc.nick, modeStr},
	457	})
[46]	458	})
	459	} else {
[55]	460	dc.SendMessage(&irc.Message{
	461	Prefix: dc.srv.prefix(),
[46]	462	Command: irc.RPL_UMODEIS,
	463	Params: []string{""}, // TODO
[54]	464	})
[46]	465	}
	466	}
[58]	467	case "PRIVMSG":
	468	var targetsStr, text string
	469	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	470	return err
	471	}
	472
	473	for _, name := range strings.Split(targetsStr, ",") {
[69]	474	uc, upstreamName, err := dc.unmarshalChannel(name)
[58]	475	if err != nil {
	476	return err
	477	}
	478
[69]	479	uc.SendMessage(&irc.Message{
	480	Prefix: uc.prefix(),
[58]	481	Command: "PRIVMSG",
[69]	482	Params: []string{upstreamName, text},
[60]	483	})
[58]	484	}
[13]	485	default:
[55]	486	dc.logger.Printf("unhandled message: %v", msg)
[13]	487	return newUnknownCommandError(msg.Command)
	488	}
[42]	489	return nil
[13]	490	}

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