progress/broken: multiuser support hardcoded, by multiplexing terminals

/whois breaks, empty message breaks, prompt replication is fragile

Makefile

@@ -25,7 +25,7 @@ $(KEY):
 	ssh-keygen -f $(KEY) -P ''
 
 run: $(BINARY) $(KEY)
-	./$(BINARY) -i $(KEY) --bind ":$(PORT)" -vv
+	./$(BINARY) -i $(KEY) --bind "127.0.0.1:$(PORT)" -vv
 
 debug: $(BINARY) $(KEY)
 	./$(BINARY) --pprof 6060 -i $(KEY) --bind ":$(PORT)" -vv

client.go

@@ -1,6 +1,7 @@
 package sshchat
 
 import (
+	"io"
 	"sync"
 	"time"
 
@@ -9,22 +10,17 @@ import (
 	"github.com/shazow/ssh-chat/sshd"
 )
 
+type multiTerm interface {
+	Connections() []sshd.Connection
+	Add(*sshd.Terminal)
+	ReadLine() (string, error)
+	io.WriteCloser
+}
+
 type client struct {
 	Member
 	sync.Mutex
-	conns []sshd.Connection
-}
-
-func (cl *client) Connections() []sshd.Connection {
-	return cl.conns
-}
-
-func (cl *client) Close() error {
-	// TODO: Stack errors?
-	for _, conn := range cl.conns {
-		conn.Close()
-	}
-	return nil
+	multiTerm
 }
 
 type Member interface {

host.go

@@ -32,10 +32,9 @@ type Host struct {
 	// Default theme
 	theme message.Theme
 
-	mu      sync.Mutex
-	motd    string
-	count   int
-	clients map[chat.Member][]client
+	mu    sync.Mutex
+	motd  string
+	count int
 }
 
 // NewHost creates a Host on top of an existing listener.
@@ -46,7 +45,6 @@ func NewHost(listener *sshd.SSHListener, auth *Auth) *Host {
 		listener: listener,
 		commands: chat.Commands{},
 		auth:     auth,
-		clients:  map[chat.Member][]client{},
 	}
 
 	// Make our own commands registry instance.
@@ -72,15 +70,30 @@ func (h *Host) SetMotd(motd string) {
 	h.mu.Unlock()
 }
 
+var globalUser *client
+
 // Connect a specific Terminal to this host and its room.
-func (h *Host) Connect(term *sshd.Terminal) {
-	requestedName := term.Conn.Name()
-	screen := message.BufferedScreen(requestedName, term)
-	user := &client{
-		Member: screen,
-		conns:  []sshd.Connection{term.Conn},
+func (h *Host) Connect(t *sshd.Terminal) {
+	// XXX: Hack to test multiple users per key
+	if globalUser != nil {
+		globalUser.Add(t)
+		return
 	}
 
+	conn := t.Conn
+	remoteAddr := conn.RemoteAddr()
+	requestedName := conn.Name()
+	term := sshd.MultiTerm(t)
+	screen := message.BufferedScreen(requestedName, term)
+
+	user := &client{
+		Member:    screen,
+		multiTerm: term,
+	}
+	defer user.Close()
+	// XXX: Hack to test multiple users per key
+	globalUser = user
+
 	h.mu.Lock()
 	motd := h.motd
 	count := h.count
@@ -91,10 +104,6 @@ func (h *Host) Connect(term *sshd.Terminal) {
 	cfg.Theme = &h.theme
 	user.SetConfig(cfg)
 
-	// Close term once user is closed.
-	defer screen.Close()
-	defer term.Close()
-
 	go screen.Consume()
 
 	// Send MOTD
@@ -109,7 +118,7 @@ func (h *Host) Connect(term *sshd.Terminal) {
 		member, err = h.Join(user)
 	}
 	if err != nil {
-		logger.Errorf("[%s] Failed to join: %s", term.Conn.RemoteAddr(), err)
+		logger.Errorf("[%s] Failed to join: %s", conn.RemoteAddr(), err)
 		return
 	}
 
@@ -118,27 +127,29 @@ func (h *Host) Connect(term *sshd.Terminal) {
 	term.AutoCompleteCallback = h.AutoCompleteFunction(user)
 	user.SetHighlight(user.Name())
 
+	// XXX: Mark multiterm as ready?
+
 	// Should the user be op'd on join?
-	if key := term.Conn.PublicKey(); key != nil {
+	if key := conn.PublicKey(); key != nil {
 		authItem, err := h.auth.ops.Get(newAuthKey(key))
 		if err == nil {
 			err = h.Room.Ops.Add(set.Rename(authItem, member.ID()))
 		}
 	}
 	if err != nil {
-		logger.Warningf("[%s] Failed to op: %s", term.Conn.RemoteAddr(), err)
+		logger.Warningf("[%s] Failed to op: %s", remoteAddr, err)
 	}
 
 	ratelimit := rateio.NewSimpleLimiter(3, time.Second*3)
-	logger.Debugf("[%s] Joined: %s", term.Conn.RemoteAddr(), user.Name())
+	logger.Debugf("[%s] Joined: %s", remoteAddr, user.Name())
 
 	for {
-		line, err := term.ReadLine()
+		line, err := user.ReadLine()
 		if err == io.EOF {
 			// Closed
 			break
 		} else if err != nil {
-			logger.Errorf("[%s] Terminal reading error: %s", term.Conn.RemoteAddr(), err)
+			logger.Errorf("[%s] Terminal reading error: %s", remoteAddr, err)
 			break
 		}
 
@@ -175,10 +186,10 @@ func (h *Host) Connect(term *sshd.Terminal) {
 
 	err = h.Leave(user)
 	if err != nil {
-		logger.Errorf("[%s] Failed to leave: %s", term.Conn.RemoteAddr(), err)
+		logger.Errorf("[%s] Failed to leave: %s", remoteAddr, err)
 		return
 	}
-	logger.Debugf("[%s] Leaving: %s", term.Conn.RemoteAddr(), user.Name())
+	logger.Debugf("[%s] Leaving: %s", remoteAddr, user.Name())
 }
 
 // Serve our chat room onto the listener

sshd/multiterm.go

@@ -0,0 +1,131 @@
+package sshd
+
+import (
+	"fmt"
+	"io"
+	"sync"
+)
+
+type termLine struct {
+	Term *Terminal
+	Line string
+	Err  error
+}
+
+func MultiTerm(terms ...*Terminal) *multiTerm {
+	mt := &multiTerm{
+		lines: make(chan termLine),
+	}
+	for _, t := range terms {
+		mt.Add(t)
+	}
+	return mt
+}
+
+type multiTerm struct {
+	AutoCompleteCallback func(line string, pos int, key rune) (newLine string, newPos int, ok bool)
+
+	mu     sync.Mutex
+	terms  []*Terminal
+	add    chan *Terminal
+	lines  chan termLine
+	prompt string
+}
+
+func (mt *multiTerm) SetPrompt(prompt string) {
+	mt.mu.Lock()
+	mt.prompt = prompt
+	mt.mu.Unlock()
+	for _, t := range mt.Terminals() {
+		t.SetPrompt(prompt)
+	}
+}
+
+func (mt *multiTerm) Connections() []Connection {
+	terms := mt.Terminals()
+	conns := make([]Connection, len(terms))
+	for _, term := range terms {
+		conns = append(conns, term.Conn)
+	}
+	return conns
+}
+
+func (mt *multiTerm) Terminals() []*Terminal {
+	mt.mu.Lock()
+	terms := mt.terms
+	mt.mu.Unlock()
+	return terms
+}
+
+func (mt *multiTerm) Add(t *Terminal) {
+	mt.mu.Lock()
+	mt.terms = append(mt.terms, t)
+	prompt := mt.prompt
+	mt.mu.Unlock()
+	t.AutoCompleteCallback = mt.AutoCompleteCallback
+	t.SetPrompt(prompt)
+
+	go func() {
+		var line termLine
+		for {
+			line.Line, line.Err = t.ReadLine()
+			line.Term = t
+			mt.lines <- line
+			if line.Err != nil {
+				// FIXME: Should we not abort on all errors?
+				break
+			}
+		}
+	}()
+}
+
+func (mt *multiTerm) ReadLine() (string, error) {
+	line := <-mt.lines
+	mt.mu.Lock()
+	prompt := mt.prompt
+	mt.mu.Unlock()
+	if line.Err == nil {
+		// Write the line to all the other terminals
+		for _, w := range mt.Terminals() {
+			if w == line.Term {
+				continue
+			}
+			// XXX: This is super hacky and frankly wrong.
+			w.Write([]byte(prompt + line.Line + "\n\r"))
+			// TODO: Remove terminal if it fails to write?
+		}
+	}
+	return line.Line, line.Err
+}
+
+func (mt *multiTerm) Write(p []byte) (n int, err error) {
+	for _, w := range mt.Terminals() {
+		n, err = w.Write(p)
+		if err != nil {
+			return
+		}
+		if n != len(p) {
+			err = io.ErrShortWrite
+			return
+		}
+	}
+	return len(p), nil
+}
+
+func (mt *multiTerm) Close() error {
+	mt.mu.Lock()
+	var errs []error
+	for _, t := range mt.terms {
+		if err := t.Close(); err != nil {
+			errs = append(errs, err)
+		}
+	}
+	mt.terms = nil
+	mt.mu.Unlock()
+
+	if len(errs) == 0 {
+		return nil
+	}
+
+	return fmt.Errorf("%d errors: %q", len(errs), errs)
+}

util.go

@@ -0,0 +1,12 @@
+package sshchat
+
+import "fmt"
+
+type multiError []error
+
+func (err multiError) Error() string {
+	if len(err) == 0 {
+		return ""
+	}
+	return fmt.Sprintf("%d errors: %q", len(err), err)
+}