I think I get IRC protocol now.

build.sh

@@ -1,2 +1,2 @@
 #!/bin/bash
-env GOPATH="$PWD" go install ergonomadic
+env GOPATH="$PWD" go install -v ergonomadic

src/irc/channel.go

@@ -79,6 +79,10 @@ func (ch *Channel) Part(cl *Client, message string) {
 
 	delete(ch.members, cl)
 	delete(cl.channels, ch)
+
+	if len(ch.members) == 0 {
+		ch.server.DeleteChannel(ch)
+	}
 }
 
 func (ch *Channel) PrivMsg(cl *Client, message string) {

src/irc/client.go

@@ -10,7 +10,6 @@ import (
 type Client struct {
 	conn       net.Conn
 	send       chan<- Reply
-	recv       <-chan string
 	username   string
 	realname   string
 	hostname   string
@@ -27,39 +26,47 @@ type Client struct {
 type ClientSet map[*Client]bool
 
 func NewClient(server *Server, conn net.Conn) *Client {
+	read := StringReadChan(conn)
+	write := StringWriteChan(conn)
+	send := make(chan Reply)
+
 	client := &Client{
 		channels: make(ChannelSet),
 		conn:     conn,
 		hostname: LookupHostname(conn.RemoteAddr()),
-		recv:     StringReadChan(conn),
 		server:   server,
+		send:     send,
 	}
-	client.SetReplyToStringChan()
+
+	// Connect the conn to the server.
+	go client.readConn(read)
+
+	// Connect the reply channel to the conn.
+	go client.writeConn(write, send)
+
 	return client
 }
 
-func (c *Client) SetReplyToStringChan() {
+func (c *Client) readConn(recv <-chan string) {
-	send := make(chan Reply)
+	for str := range recv {
-	write := StringWriteChan(c.conn)
+		log.Printf("%s > %s", c.Id(), str)
-	go func() {
-		for reply := range send {
-			replyStr := reply.String(c)
-			log.Printf("%s <- %s", c.Id(), replyStr)
-			write <- replyStr
-		}
-	}()
-	c.send = send
-}
 
-// Adapt `chan string` to a `chan Message`.
-func (c *Client) Communicate() {
-	for str := range c.recv {
 		m, err := ParseMessage(str)
 		if err != nil {
 			// TODO handle error
-			return
+			continue
 		}
-		c.server.recv <- &ClientMessage{c, m}
+
+		m.SetClient(c)
+		c.server.recv <- m
+	}
+}
+
+func (c *Client) writeConn(write chan<- string, send <-chan Reply) {
+	for reply := range send {
+		replyStr := reply.String(c)
+		log.Printf("%s < %s", c.Id(), replyStr)
+		write <- replyStr
 	}
 }
 

src/irc/commands.go

@@ -10,6 +10,8 @@ import (
 
 type Message interface {
 	Handle(s *Server, c *Client)
+	Client() *Client
+	SetClient(c *Client)
 }
 
 var (
@@ -17,9 +19,22 @@ var (
 	UModeUnknownFlagError = errors.New("unknown umode flag")
 )
 
-// unknown
+type BaseMessage struct {
+	client *Client
+}
+
+func (m *BaseMessage) Client() *Client {
+	return m.client
+}
+
+func (m *BaseMessage) SetClient(c *Client) {
+	m.client = c
+}
+
+// unknown <command> [args...]
 
 type UnknownMessage struct {
+	*BaseMessage
 	command string
 	args    []string
 }
@@ -30,9 +45,10 @@ func (m *UnknownMessage) Handle(s *Server, c *Client) {
 	c.send <- ErrUnknownCommand(s, m.command)
 }
 
-// PING
+// PING <server1> [ <server2> ]
 
 type PingMessage struct {
+	*BaseMessage
 	server  string
 	server2 string
 }
@@ -41,7 +57,10 @@ func NewPingMessage(args []string) (Message, error) {
 	if len(args) < 1 {
 		return nil, NotEnoughArgsError
 	}
-	msg := &PingMessage{server: args[0]}
+	msg := &PingMessage{
+		BaseMessage: &BaseMessage{},
+		server:      args[0],
+	}
 	if len(args) > 1 {
 		msg.server2 = args[1]
 	}
@@ -52,9 +71,10 @@ func (m *PingMessage) Handle(s *Server, c *Client) {
 	c.send <- RplPong(s)
 }
 
-// PONG
+// PONG <server> [ <server2> ]
 
 type PongMessage struct {
+	*BaseMessage
 	server1 string
 	server2 string
 }
@@ -77,6 +97,7 @@ func (m *PongMessage) Handle(s *Server, c *Client) {
 // PASS <password>
 
 type PassMessage struct {
+	*BaseMessage
 	password string
 }
 
@@ -85,6 +106,7 @@ func NewPassMessage(args []string) (Message, error) {
 		return nil, NotEnoughArgsError
 	}
 	return &PassMessage{
+		BaseMessage: &BaseMessage{},
 		password:    args[0],
 	}, nil
 }
@@ -97,9 +119,10 @@ func (m *PassMessage) Handle(s *Server, c *Client) {
 	}
 }
 
-// NICK
+// NICK <nickname>
 
 type NickMessage struct {
+	*BaseMessage
 	nickname string
 }
 
@@ -107,16 +130,20 @@ func NewNickMessage(args []string) (Message, error) {
 	if len(args) != 1 {
 		return nil, NotEnoughArgsError
 	}
-	return &NickMessage{args[0]}, nil
+	return &NickMessage{
+		BaseMessage: &BaseMessage{},
+		nickname:    args[0],
+	}, nil
 }
 
 func (m *NickMessage) Handle(s *Server, c *Client) {
 	s.ChangeNick(c, m.nickname)
 }
 
-// USER
+// USER <user> <mode> <unused> <realname>
 
 type UserMessage struct {
+	*BaseMessage
 	user     string
 	mode     uint8
 	unused   string
@@ -128,6 +155,7 @@ func NewUserMessage(args []string) (Message, error) {
 		return nil, NotEnoughArgsError
 	}
 	msg := &UserMessage{
+		BaseMessage: &BaseMessage{},
 		user:        args[0],
 		unused:      args[2],
 		realname:    args[3],
@@ -146,11 +174,14 @@ func (m *UserMessage) Handle(s *Server, c *Client) {
 // QUIT [ <Quit Message> ]
 
 type QuitMessage struct {
+	*BaseMessage
 	message string
 }
 
 func NewQuitMessage(args []string) (Message, error) {
-	msg := &QuitMessage{}
+	msg := &QuitMessage{
+		BaseMessage: &BaseMessage{},
+	}
 	if len(args) > 0 {
 		msg.message = args[0]
 	}
@@ -164,6 +195,7 @@ func (m *QuitMessage) Handle(s *Server, c *Client) {
 // MODE <nickname> *( ( "+" / "-" ) *( "i" / "w" / "o" / "O" / "r" ) )
 
 type ModeMessage struct {
+	*BaseMessage
 	nickname string
 	modes    []string
 }
@@ -203,6 +235,7 @@ func NewModeMessage(args []string) (Message, error) {
 	}
 
 	msg := &ModeMessage{
+		BaseMessage: &BaseMessage{},
 		nickname:    args[0],
 	}
 	for _, arg := range args[1:] {
@@ -238,13 +271,16 @@ func (m *ChannelModeMessage) Handle(s *Server, c *Client) {
 // JOIN ( <channel> *( "," <channel> ) [ <key> *( "," <key> ) ] ) / "0"
 
 type JoinMessage struct {
+	*BaseMessage
 	channels []string
 	keys     []string
 	zero     bool
 }
 
 func NewJoinMessage(args []string) (Message, error) {
-	msg := &JoinMessage{}
+	msg := &JoinMessage{
+		BaseMessage: &BaseMessage{},
+	}
 	if len(args) > 0 {
 		if args[0] == "0" {
 			msg.zero = true
@@ -276,9 +312,10 @@ func (m *JoinMessage) Handle(s *Server, c *Client) {
 	}
 }
 
-// PART
+// PART <channel> *( "," <channel> ) [ <Part Message> ]
 
 type PartMessage struct {
+	*BaseMessage
 	channels []string
 	message  string
 }
@@ -287,7 +324,11 @@ func NewPartMessage(args []string) (Message, error) {
 	if len(args) < 1 {
 		return nil, NotEnoughArgsError
 	}
-	msg := &PartMessage{channels: strings.Split(args[0], ",")}
+	msg := &PartMessage{
+
+		BaseMessage: &BaseMessage{},
+		channels:    strings.Split(args[0], ","),
+	}
 	if len(args) > 1 {
 		msg.message = args[1]
 	}
@@ -307,9 +348,10 @@ func (m *PartMessage) Handle(s *Server, c *Client) {
 	}
 }
 
-// PRIVMSG
+// PRIVMSG <target> <message>
 
 type PrivMsgMessage struct {
+	*BaseMessage
 	target  string
 	message string
 }
@@ -319,6 +361,7 @@ func NewPrivMsgMessage(args []string) (Message, error) {
 		return nil, NotEnoughArgsError
 	}
 	return &PrivMsgMessage{
+		BaseMessage: &BaseMessage{},
 		target:      args[0],
 		message:     args[1],
 	}, nil
@@ -350,6 +393,7 @@ func (m *PrivMsgMessage) Handle(s *Server, c *Client) {
 // TOPIC [newtopic]
 
 type TopicMessage struct {
+	*BaseMessage
 	channel string
 	topic   string
 }
@@ -358,7 +402,10 @@ func NewTopicMessage(args []string) (Message, error) {
 	if len(args) < 1 {
 		return nil, NotEnoughArgsError
 	}
-	msg := &TopicMessage{channel: args[0]}
+	msg := &TopicMessage{
+		BaseMessage: &BaseMessage{},
+		channel:     args[0],
+	}
 	if len(args) > 1 {
 		msg.topic = args[1]
 	}
@@ -378,27 +425,25 @@ func (m *TopicMessage) Handle(s *Server, c *Client) {
 	}
 }
 
-// OPER <name> <password>
+// LOGIN <nick> <password>
 
-type OperMessage struct {
+type LoginMessage struct {
-	name     string
+	*BaseMessage
+	nick     string
 	password string
 }
 
-func NewOperMessage(args []string) (Message, error) {
+func NewLoginMessage(args []string) (Message, error) {
 	if len(args) < 2 {
 		return nil, NotEnoughArgsError
 	}
-	return &OperMessage{
+	return &LoginMessage{
-		name:     args[0],
+		BaseMessage: &BaseMessage{},
+		nick:        args[0],
 		password:    args[1],
 	}, nil
 }
 
-func (m *OperMessage) Handle(s *Server, c *Client) {
+func (m *LoginMessage) Handle(s *Server, c *Client) {
-	if s.operators[m.name] == m.password {
+	// TODO
-		c.send <- RplYoureOper(s)
-	} else {
-		c.send <- ErrPasswdMismatch(s)
-	}
 }

src/irc/constants.go

@@ -149,4 +149,5 @@ const (
 	RPL_PART    = "PART"
 	RPL_PONG    = "PONG"
 	RPL_PRIVMSG = "PRIVMSG"
+	RPL_QUIT    = "QUIT"
 )

src/irc/parse.go

@@ -12,6 +12,7 @@ var (
 	parseCommandFuncs = map[string]ParseFunc{
 		"JOIN":    NewJoinMessage,
 		"MODE":    NewModeMessage,
+		"LOGIN":   NewLoginMessage,
 		"NICK":    NewNickMessage,
 		"PART":    NewPartMessage,
 		"PASS":    NewPassMessage,
@@ -21,7 +22,6 @@ var (
 		"QUIT":    NewQuitMessage,
 		"TOPIC":   NewTopicMessage,
 		"USER":    NewUserMessage,
-		"OPER":    NewOperMessage,
 	}
 )
 
@@ -29,7 +29,11 @@ func ParseMessage(line string) (Message, error) {
 	command, args := parseLine(line)
 	constructor, ok := parseCommandFuncs[command]
 	if !ok {
-		return &UnknownMessage{command, args}, nil
+		return &UnknownMessage{
+			BaseMessage: &BaseMessage{},
+			command:     command,
+			args:        args,
+		}, nil
 	}
 	return constructor(args)
 }

src/irc/reply.go

@@ -20,175 +20,178 @@ type BasicReply struct {
 	message string
 }
 
+func NewBasicReply(source Identifier, code string, message string) *BasicReply {
+	fullMessage := fmt.Sprintf(":%s %s %s\r\n", source.Id(), code, message)
+	return &BasicReply{source, code, fullMessage}
+}
+
 func (reply *BasicReply) String(client *Client) string {
+	return reply.message
+}
+
+type NumericReply struct {
+	*BasicReply
+}
+
+func NewNumericReply(source Identifier, code string, message string) *NumericReply {
+	return &NumericReply{&BasicReply{source, code, message}}
+}
+
+func (reply *NumericReply) String(client *Client) string {
 	return fmt.Sprintf(":%s %s %s %s\r\n", reply.source.Id(), reply.code, client.Nick(),
 		reply.message)
 }
 
-type ChannelReply struct {
-	*BasicReply
-	channel *Channel
-}
-
-func (reply *ChannelReply) String(client *Client) string {
-	return fmt.Sprintf(":%s %s %s %s\r\n", reply.source.Id(), reply.code, reply.channel.name,
-		reply.message)
-}
-
-func NewReply(source Identifier, code string, message string) *BasicReply {
-	return &BasicReply{source, code, message}
-}
-
 // messaging
 
 func RplPrivMsg(source *Client, message string) Reply {
-	return NewReply(source, RPL_PRIVMSG, ":"+message)
+	return NewNumericReply(source, RPL_PRIVMSG, ":"+message)
 }
 
 func RplNick(client *Client, newNick string) Reply {
-	return NewReply(client, RPL_NICK, ":"+newNick)
+	return NewBasicReply(client, RPL_NICK, newNick)
 }
 
-func RplInviteMsg(channel *Channel, inviter *Client) Reply {
+func RplPrivMsgChannel(channel *Channel, source *Client, message string) Reply {
-	return NewReply(inviter, RPL_INVITE, channel.name)
+	return NewBasicReply(source, RPL_PRIVMSG, fmt.Sprintf("%s :%s", channel.name, message))
 }
 
-func RplInvitingMsg(channel *Channel, invitee *Client) Reply {
+func RplJoin(channel *Channel, client *Client) Reply {
-	return NewReply(channel.server, RPL_INVITING,
+	return NewBasicReply(client, RPL_JOIN, channel.name)
-		fmt.Sprintf("%s %s", channel.name, invitee.Nick()))
+}
+
+func RplPart(channel *Channel, client *Client, message string) Reply {
+	return NewBasicReply(client, RPL_PART, fmt.Sprintf("%s :%s", channel.name, message))
+}
+
+func RplPong(server *Server) Reply {
+	return NewBasicReply(server, RPL_PONG, server.Id())
+}
+
+func RplQuit(client *Client, message string) Reply {
+	return NewBasicReply(client, RPL_QUIT, ":"+message)
 }
 
 // Server Info
 
 func RplWelcome(source Identifier, client *Client) Reply {
-	return NewReply(source, RPL_WELCOME,
+	return NewNumericReply(source, RPL_WELCOME,
 		"Welcome to the Internet Relay Network "+client.Id())
 }
 
 func RplYourHost(server *Server, target *Client) Reply {
-	return NewReply(server, RPL_YOURHOST,
+	return NewNumericReply(server, RPL_YOURHOST,
 		fmt.Sprintf("Your host is %s, running version %s", server.hostname, VERSION))
 }
 
 func RplCreated(server *Server) Reply {
-	return NewReply(server, RPL_CREATED,
+	return NewNumericReply(server, RPL_CREATED,
 		"This server was created "+server.ctime.Format(time.RFC1123))
 }
 
 func RplMyInfo(server *Server) Reply {
-	return NewReply(server, RPL_MYINFO,
+	return NewNumericReply(server, RPL_MYINFO,
 		fmt.Sprintf("%s %s w kn", server.name, VERSION))
 }
 
 func RplUModeIs(server *Server, client *Client) Reply {
-	return NewReply(server, RPL_UMODEIS, client.UModeString())
+	return NewNumericReply(server, RPL_UMODEIS, client.UModeString())
 }
 
-// channel operations
+// numeric replies
-
-func RplPrivMsgChannel(channel *Channel, source *Client, message string) Reply {
-	return &ChannelReply{NewReply(source, RPL_PRIVMSG, ":"+message), channel}
-}
-
-func RplJoin(channel *Channel, client *Client) Reply {
-	return &ChannelReply{NewReply(client, RPL_JOIN, ""), channel}
-}
-
-func RplPart(channel *Channel, client *Client, message string) Reply {
-	return &ChannelReply{NewReply(client, RPL_PART, ":"+message), channel}
-}
 
 func RplNoTopic(channel *Channel) Reply {
-	return NewReply(channel.server, RPL_NOTOPIC, channel.name+" :No topic is set")
+	return NewNumericReply(channel.server, RPL_NOTOPIC, channel.name+" :No topic is set")
 }
 
 func RplTopic(channel *Channel) Reply {
-	return NewReply(channel.server, RPL_TOPIC, fmt.Sprintf("%s :%s", channel.name, channel.topic))
+	return NewNumericReply(channel.server, RPL_TOPIC, fmt.Sprintf("%s :%s", channel.name, channel.topic))
 }
 
-// server info
+func RplInviteMsg(channel *Channel, inviter *Client) Reply {
+	return NewNumericReply(inviter, RPL_INVITE, channel.name)
+}
+
+func RplInvitingMsg(channel *Channel, invitee *Client) Reply {
+	return NewNumericReply(channel.server, RPL_INVITING,
+		fmt.Sprintf("%s %s", channel.name, invitee.Nick()))
+}
 
 func RplNamReply(channel *Channel) Reply {
 	// TODO multiple names and splitting based on message size
-	return NewReply(channel.server, RPL_NAMREPLY,
+	return NewNumericReply(channel.server, RPL_NAMREPLY,
 		fmt.Sprintf("= %s :%s", channel.name, strings.Join(channel.Nicks(), " ")))
 }
 
 func RplEndOfNames(source Identifier) Reply {
-	return NewReply(source, RPL_ENDOFNAMES, ":End of NAMES list")
+	return NewNumericReply(source, RPL_ENDOFNAMES, ":End of NAMES list")
 }
 
-func RplPong(server *Server) Reply {
-	return NewReply(server, RPL_PONG, server.Id())
-}
-
-// server functions
-
 func RplYoureOper(server *Server) Reply {
-	return NewReply(server, RPL_YOUREOPER, ":You are now an IRC operator")
+	return NewNumericReply(server, RPL_YOUREOPER, ":You are now an IRC operator")
 }
 
 // errors
 
 func ErrAlreadyRegistered(source Identifier) Reply {
-	return NewReply(source, ERR_ALREADYREGISTRED, ":You may not reregister")
+	return NewNumericReply(source, ERR_ALREADYREGISTRED, ":You may not reregister")
 }
 
 func ErrNickNameInUse(source Identifier, nick string) Reply {
-	return NewReply(source, ERR_NICKNAMEINUSE,
+	return NewNumericReply(source, ERR_NICKNAMEINUSE,
 		nick+" :Nickname is already in use")
 }
 
 func ErrUnknownCommand(source Identifier, command string) Reply {
-	return NewReply(source, ERR_UNKNOWNCOMMAND,
+	return NewNumericReply(source, ERR_UNKNOWNCOMMAND,
 		command+" :Unknown command")
 }
 
 func ErrUsersDontMatch(source Identifier) Reply {
-	return NewReply(source, ERR_USERSDONTMATCH,
+	return NewNumericReply(source, ERR_USERSDONTMATCH,
 		":Cannot change mode for other users")
 }
 
 func ErrNeedMoreParams(source Identifier, command string) Reply {
-	return NewReply(source, ERR_NEEDMOREPARAMS,
+	return NewNumericReply(source, ERR_NEEDMOREPARAMS,
 		command+"%s :Not enough parameters")
 }
 
 func ErrNoSuchChannel(source Identifier, channel string) Reply {
-	return NewReply(source, ERR_NOSUCHCHANNEL,
+	return NewNumericReply(source, ERR_NOSUCHCHANNEL,
 		channel+" :No such channel")
 }
 
 func ErrUserOnChannel(channel *Channel, member *Client) Reply {
-	return NewReply(channel.server, ERR_USERONCHANNEL,
+	return NewNumericReply(channel.server, ERR_USERONCHANNEL,
 		fmt.Sprintf("%s %s :is already on channel", member.nick, channel.name))
 }
 
 func ErrNotOnChannel(channel *Channel) Reply {
-	return NewReply(channel.server, ERR_NOTONCHANNEL,
+	return NewNumericReply(channel.server, ERR_NOTONCHANNEL,
 		channel.name+" :You're not on that channel")
 }
 
 func ErrInviteOnlyChannel(channel *Channel) Reply {
-	return NewReply(channel.server, ERR_INVITEONLYCHAN,
+	return NewNumericReply(channel.server, ERR_INVITEONLYCHAN,
 		channel.name+" :Cannot join channel (+i)")
 }
 
 func ErrBadChannelKey(channel *Channel) Reply {
-	return NewReply(channel.server, ERR_BADCHANNELKEY,
+	return NewNumericReply(channel.server, ERR_BADCHANNELKEY,
 		channel.name+" :Cannot join channel (+k)")
 }
 
 func ErrNoSuchNick(source Identifier, nick string) Reply {
-	return NewReply(source, ERR_NOSUCHNICK,
+	return NewNumericReply(source, ERR_NOSUCHNICK,
 		nick+" :No such nick/channel")
 }
 
 func ErrPasswdMismatch(server *Server) Reply {
-	return NewReply(server, ERR_PASSWDMISMATCH, ":Password incorrect")
+	return NewNumericReply(server, ERR_PASSWDMISMATCH, ":Password incorrect")
 }
 
 func ErrNoChanModes(channel *Channel) Reply {
-	return NewReply(channel.server, ERR_NOCHANMODES,
+	return NewNumericReply(channel.server, ERR_NOCHANMODES,
 		channel.name+" :Channel doesn't support modes")
 }

src/irc/server.go

@@ -10,20 +10,14 @@ type Server struct {
 	hostname string
 	ctime    time.Time
 	name     string
-	recv      chan<- *ClientMessage
+	recv     chan<- Message
+	password string
 	nicks    map[string]*Client
 	channels map[string]*Channel
-	password  string
-	operators map[string]string
-}
-
-type ClientMessage struct {
-	client  *Client
-	message Message
 }
 
 func NewServer(name string) *Server {
-	recv := make(chan *ClientMessage)
+	recv := make(chan Message)
 	server := &Server{
 		ctime:    time.Now(),
 		name:     name,
@@ -33,9 +27,8 @@ func NewServer(name string) *Server {
 	}
 	go func() {
 		for m := range recv {
-			log.Printf("%s -> %T%+v", m.client.Id(), m.message, m.message)
+			m.Client().atime = time.Now()
-			m.client.atime = time.Now()
+			m.Handle(server, m.Client())
-			m.message.Handle(server, m.client)
 		}
 	}()
 	return server
@@ -57,7 +50,7 @@ func (s *Server) Listen(addr string) {
 			continue
 		}
 		log.Print("Server.Listen: accepted ", conn.RemoteAddr())
-		go NewClient(s, conn).Communicate()
+		go NewClient(s, conn)
 	}
 }
 
@@ -72,13 +65,10 @@ func (s *Server) GetOrMakeChannel(name string) *Channel {
 	return channel
 }
 
-func (s *Server) AddOperator(name string, password string) {
-	s.operators[name] = password
-}
-
 // Send a message to clients of channels fromClient is a member.
 func (s *Server) SendToInterestedClients(fromClient *Client, reply Reply) {
-	clients := make(map[*Client]bool)
+
+	clients := make(ClientSet)
 	clients[fromClient] = true
 	for channel := range fromClient.channels {
 		for client := range channel.members {
@@ -98,14 +88,12 @@ func (s *Server) ChangeNick(c *Client, newNick string) {
 		c.send <- ErrNickNameInUse(s, newNick)
 		return
 	}
+	s.SendToInterestedClients(c, RplNick(c, newNick))
 
 	if c.nick != "" {
 		delete(s.nicks, c.nick)
 	}
 	s.nicks[newNick] = c
-
-	s.SendToInterestedClients(c, RplNick(c, newNick))
-
 	c.nick = newNick
 
 	s.tryRegister(c)
@@ -136,7 +124,7 @@ func (s *Server) Quit(c *Client, message string) {
 		channel.Part(c, message)
 	}
 	delete(s.nicks, c.nick)
-
+	s.SendToInterestedClients(c, RplQuit(c, message))
 	c.conn.Close()
 }
 
@@ -155,3 +143,7 @@ func (s *Server) ChangeUserMode(c *Client, modes []string) {
 func (s *Server) Id() string {
 	return s.hostname
 }
+
+func (s *Server) DeleteChannel(channel *Channel) {
+	delete(s.channels, channel.name)
+}

src/irc/user.go

@@ -0,0 +1,5 @@
+package irc
+
+type User struct {
+	nick string
+}