update usage

chatserver.go

@@ -92,7 +92,7 @@ var broadcastMsg chan chatMsg
 // Telnet
 var wantsServerHello chan bufferedConn
 var authTelnet chan telnetUser
-var cleanTelnet chan telnetUser
+var cleanTelnet chan telnetUser // intentionally blocking
 
 // HTTP
 var demuxHttpClient chan bufferedConn
@@ -101,7 +101,7 @@ var valAuthReqs chan authReq
 var delAuthReqs chan authReq
 
 func usage() {
-	fmt.Fprintf(os.Stderr, "\nusage: go run chatserver.go\n")
+	fmt.Fprintf(os.Stderr, "\nusage: go run chatserver*.go\n")
 	flag.PrintDefaults()
 	fmt.Println()
 
@@ -301,7 +301,7 @@ func main() {
 	virginConns = make(chan net.Conn, 128)
 
 	// TCP & Authentication
-	telnetConns := make(map[bufferedConn]telnetUser)
+	telnetConns := make(map[string]telnetUser)
 	wantsServerHello = make(chan bufferedConn, 128)
 	authTelnet = make(chan telnetUser, 128)
 
@@ -389,7 +389,12 @@ func main() {
 		case u := <-authTelnet:
 			// allow to receive messages
 			// (and be counted among the users)
-			telnetConns[u.bufConn] = u
+			_, ok := telnetConns[u.email]
+			if ok {
+				// this is a blocking channel, and that's important
+				cleanTelnet <- telnetConns[u.email]
+			}
+			telnetConns[u.email] = u
 			// is chan chan the right way to handle this?
 			u.userCount <- len(telnetConns)
 			broadcastMsg <- chatMsg{
@@ -422,7 +427,7 @@ func main() {
 			close(u.newMsg)
 			// we can safely ignore this error, if any
 			u.bufConn.Close()
-			delete(telnetConns, u.bufConn)
+			delete(telnetConns, u.email)
 		case bufConn := <-gotClientHello:
 			go muxTcp(bufConn)
 		case bufConn := <-demuxHttpClient: