this commit does not work

main.go

@@ -9,6 +9,7 @@ func main() {
 	log.SetLevel(logrus.DebugLevel)
 	log.Println("sircd starting up")
 	s := sircd.NewSircd()
+	s.SetServerName("irc.example.com")
 	s.SetLogger(log)
 	go s.Start()
 	for s.Running {

sircd/client.go

@@ -5,20 +5,25 @@ import (
 	"github.com/google/uuid"
 	"github.com/sirupsen/logrus"
 	"net"
+	"strings"
+    "fmt"
 )
 
-func newIrcClient(conn net.Conn, log *logrus.Logger, mc chan *ircMessage) *ircClient {
+func newIrcClient(conn net.Conn, log *logrus.Logger, mc chan *ircMessage, s *sircd) *ircClient {
 	c := new(ircClient)
 	c.Id = uuid.New().String()
 	c.conn = conn
 	c.log = log
 	c.mc = mc
+	c.server = s
 	c.inputBytes = new(bytes.Buffer)
 	c.outputBytes = new(bytes.Buffer)
+	c.session = NewIrcUserSession()
 	return c
 }
 
 type ircClient struct {
+    //FIXME add a mutex and protect during writes
 	Id          string
 	conn        net.Conn
 	log         *logrus.Logger
@@ -26,11 +31,93 @@ type ircClient struct {
 	inputBytes  *bytes.Buffer
 	outputBytes *bytes.Buffer
 	mc          chan *ircMessage
+	server      *sircd
 }
 
-func (c *ircClient) Close() {
+func (c *ircClient) ServerName() string {
+	return c.server.serverName
+}
+
+func (c *ircClient) Kill() {
+	//server will remove it from the server-managed client list
+	//and will call c.CleanupAndClose() when it pops from this channel
+	c.server.deadClients <- c
+}
+
+func (c *ircClient) CleanupAndClose() {
 	//client cleanup
-	c.log.Infof("client %d disconnect", c.Id)
+	//FIXME truncate client buffers and whatnot here
+	// server object already handles removing it from the list of clients
+	// for the server, so don't do it here
+	c.log.Infof("client=%s cleanup", c.Id)
+	c.conn.Close()
+}
+
+func (c *ircClient) AppendStringToOutputBuffer(input string) {
+    // woo boilerplate because no polymorphism
+    c.AppendBytesToOutputBuffer([]byte(input))
+}
+
+func (c *ircClient) AppendBytesToOutputBuffer(input []byte) {
+	c.outputBytes.Write(input)
+}
+
+func (c *ircClient) FlushOutputBuffer() bool {
+	numBytes, err := c.outputBytes.WriteTo(c.conn)
+	if err != nil {
+		c.log.Debugf("failed to write completely to client<%s>, marking dead", c.Id)
+		c.Kill()
+        return false
+	} else {
+		c.log.Debugf("wrote %d bytes to client<%s>", numBytes, c.Id)
+        return true
+	}
+}
+
+func (c *ircClient) RespUnknownCommand(command string) {
+	//421 == unknown command
+	c.SendServerMessage(421, []string{command, "Unknown command. Please try your call again later."})
+}
+
+func (c *ircClient) SendServerMessage(code uint16, params []string) bool {
+	//FIXME this is terrible hacky duct tape code, redo it
+	p := ""
+	if len(params) > 0 {
+		// pop off last item for separate processing
+		lastelem := params[len(params)-1]
+		params = params[:len(params)-1]
+
+		for _, elem := range params {
+			if strings.ContainsAny(elem, " \t\r\n") {
+				c.log.Errorf("wtf %s", elem)
+				return false
+			}
+		}
+
+		if strings.ContainsAny(lastelem, "\t\r\n") {
+			c.log.Errorf("wtf %s", lastelem)
+			return false
+		}
+
+		if strings.ContainsAny(lastelem, " ") {
+			lastelem = fmt.Sprintf(":%s", lastelem)
+		}
+		p = strings.Join(params, " ")
+		if len(p) > 0 {
+			p = " " + lastelem
+		} else {
+			p = lastelem
+		}
+	}
+
+	sendstr := fmt.Sprintf(":%s %s %d", c.ServerName(), code, c.session.nick)
+	if len(p) > 0 {
+		sendstr = sendstr + " " + p
+	}
+	sendstr = sendstr + "\r\n"
+	c.log.Debugf("sending string '%s' to client<%s>", sendstr, c.Id)
+	c.AppendStringToOutputBuffer(sendstr)
+	return c.FlushOutputBuffer()
 }
 
 func (c *ircClient) AppendInputBuffer(input []byte) {
@@ -44,9 +131,10 @@ func (c *ircClient) AppendInputBuffer(input []byte) {
 func (c *ircClient) ParseInputBuffer() {
 	c.log.Debugf("my input buffer is %d bytes", c.inputBytes.Len())
 	c.log.Debugf("my input buffer is: '%s'", c.inputBytes.String())
-    for line, err := c.inputBytes.ReadString(byte('\n'))
+	line, err := c.inputBytes.ReadString(byte('\n'))
 	if err == nil {
-        c.mc <- c.ParseSingleInput(line) //FIXME make this return val, err
+		c.mc <- c.ParseSingleInput(line)
+		c.ParseInputBuffer()
 	} else {
 		c.log.Debugf("error parsing input buffer: ", err.Error())
 	}

sircd/irc.go

@@ -0,0 +1,35 @@
+package sircd
+
+func (s *sircd) processIRCMessage(m *ircMessage) {
+	switch m.command {
+	case "CAP":
+		s.processCAPCommand(m)
+	case "NICK":
+		s.processNICKCommand(m)
+	case "USER":
+		s.processUSERCommand(m)
+	default:
+		s.processUnknownCommand(m)
+	}
+	s.log.Infof(m.String())
+	s.log.Infof("%+v", m)
+}
+
+func (s *sircd) processUnknownCommand(m *ircMessage) {
+	m.from.RespUnknownCommand(m.command)
+}
+
+func (s *sircd) processNICKCommand(m *ircMessage) {
+	//FIXME check if nick is in use
+	//FIXME check if nick is valid
+	m.from.session.SetNick(m.params[0])
+}
+
+func (s *sircd) processUSERCommand(m *ircMessage) {
+	m.from.session.SetUserInfo(m.params[0])
+}
+
+func (s *sircd) processCAPCommand(m *ircMessage) {
+	s.log.Debugln("ignoring CAP command, unsupported")
+	// pass
+}

sircd/main.go

@@ -1,30 +0,0 @@
-package sircd
-
-func (s *sircd) processIRCMessage(m *ircMessage) {
-	s.log.Info("not implemented")
-	//for client, _ := range s.ircClients {
-	//}
-}
-
-/*
-
-import "net"
-		case publish := <-publishes:
-			for conn, _ := range conns {
-				go func(conn net.Conn) {
-					totalWritten := 0
-					for totalWritten < len(publish) {
-						writtenThisCall, err := conn.Write(publish[totalWritten:])
-						if err != nil {
-							deadConns <- conn
-							break
-						}
-						totalWritten += writtenThisCall
-					}
-				}(conn)
-			}
-		}
-	}
-	listener.Close()
-}
-*/

sircd/message.go

@@ -1,12 +1,12 @@
 package sircd
 
 import (
-    "strings"
+	"errors"
 	"fmt"
 	"regexp"
+	"strings"
 )
 
-
 type ircMessage struct {
 	from *ircClient
 	//received
@@ -17,8 +17,7 @@ type ircMessage struct {
 	params  []string
 }
 
-func NewIrcMessageFromString (line string, from *ircClient) *ircMessage {
-
+func parseIrcLine(line string) (*ircMessage, error) {
 	//FIXME do this at compile or start time instead of every message
 	ircregex, err := regexp.Compile(`^(\@(\S+) )?(?:[:](\S+) )?(\S+)(?: ([^:].+?))?(?: [:](.+))?$`)
 
@@ -27,18 +26,17 @@ func NewIrcMessageFromString (line string, from *ircClient) *ircMessage {
 	}
 
 	line = strings.TrimRight(line, "\r\n")
+
 	m := new(ircMessage)
 	m.raw = line
 
 	if ircregex.MatchString(m.raw) == false {
-        m.command = "UNKNOWN"
-        return m
+		return nil, errors.New("parse error")
 	}
 	matches := ircregex.FindAllStringSubmatch(m.raw, -1)
 
 	if len(matches) == 0 {
-        m.command = "UNKNOWN"
-        return m
+		return nil, errors.New("parse error")
 	}
 
 	match := matches[0]
@@ -46,7 +44,7 @@ func NewIrcMessageFromString (line string, from *ircClient) *ircMessage {
 	fmt.Printf("%+v\n", len(match))
 	m.tags = match[2]
 	m.source = match[3]
-    m.command = match[4]
+	m.command = strings.ToUpper(match[4])
 	if len(match[5]) > 0 {
 		m.params = strings.Fields(match[5])
 	}
@@ -54,12 +52,18 @@ func NewIrcMessageFromString (line string, from *ircClient) *ircMessage {
 		m.params = append(m.params, match[6])
 	}
 
-    fmt.Printf("%+v\n", &m)
-    fmt.Println(m)
-    return m
+	return m, nil
 }
 
+func NewIrcMessageFromString(line string, from *ircClient) *ircMessage {
+	msg, err := parseIrcLine(line)
+
+	if err != nil {
+		panic("wat")
+	}
+	return msg
+}
 
 func (m *ircMessage) String() string {
-    return fmt.Sprintf("IRCMessage<%s>('%s')", m.command, m.raw)
+	return fmt.Sprintf("IRCMessage<%s>('%s')", m.command, strings.Join(m.params, ","))
 }

sircd/server.go

@@ -7,6 +7,7 @@ import (
 
 type sircd struct {
 	Running      bool
+	serverName   string
 	log          *logrus.Logger
 	netName      string
 	ircPort      uint16
@@ -31,8 +32,12 @@ func NewSircd() *sircd {
 	return s
 }
 
-func (s *sircd) SetLogger(l *logrus.Logger) {
-	s.log = l
+func (s *sircd) SetLogger(logger *logrus.Logger) {
+	s.log = logger
+}
+
+func (s *sircd) SetServerName(name string) {
+	s.serverName = name
 }
 
 func (s *sircd) Start() {
@@ -53,7 +58,7 @@ func (s *sircd) Start() {
 		if err != nil {
 			s.log.Panicf("Error accepting: ", err.Error())
 		}
-		s.newClients <- newIrcClient(conn, s.log, s.messageQueue)
+		s.newClients <- newIrcClient(conn, s.log, s.messageQueue, s)
 	}()
 
 	go s.mainloop()
@@ -70,7 +75,8 @@ func (s *sircd) mainloop() {
 				for {
 					nbyte, err := client.conn.Read(buf)
 					if err != nil {
-						s.deadClients <- client
+						//this will surface it in the deadClients channel
+						client.Kill()
 						break
 					} else {
 						fragment := make([]byte, nbyte)
@@ -82,29 +88,9 @@ func (s *sircd) mainloop() {
 			}()
 		case deadClient := <-s.deadClients:
 			delete(s.ircClients, deadClient)
-			deadClient.Close()
+			deadClient.CleanupAndClose()
 		case message := <-s.messageQueue:
 			s.processIRCMessage(message)
 		}
 	}
 }
-
-/*
-		case publish := <-publishes:
-			for conn, _ := range conns {
-				go func(conn net.Conn) {
-					totalWritten := 0
-					for totalWritten < len(publish) {
-						writtenThisCall, err := conn.Write(publish[totalWritten:])
-						if err != nil {
-							deadConns <- conn
-							break
-						}
-						totalWritten += writtenThisCall
-					}
-				}(conn)
-			}
-		}
-	}
-	listener.Close()
-*/

sircd/session.go

@@ -2,8 +2,24 @@ package sircd
 
 type ircNick string
 type ircRealName string
+type hostname string
 
 type ircUserSession struct {
+    //FIXME add a mutex and protect during writes
 	nick     ircNick
 	realname ircRealName
+	host     hostname
+}
+
+func NewIrcUserSession() *ircUserSession {
+	// FIXME get conn.RemoteAddr passed in and stringify it here and put it
+    // in the session
+	s := new(ircUserSession)
+	s.nick = '*' //default for s2c messages pre-NICK
+	return s
+}
+
+func (s *ircUserSession) SetNick(input string) {
+    // FIXME check for valid nick-ness
+    s.nick = input
 }