support changing nicks (by reconnecting)

--HG--
branch : nmdc-ircfrontend

TODO.txt

@@ -2,16 +2,8 @@
 BUGS
 ====
 
-- option (maybe default?) to always use Hub-Security's name for system messages in main chat, for mirc/atomic
-
-- flash of unstyled NMDC client tag
-
-	- Combined solution: mandate hubsec nick parameter, request CTCP VERSION prior to connection, and then apply mirc/atomic-specific fixes
-
 - /wrong/ password message shows up, but not if no password was given for a passworded nick
 
-- we're making a malformed NMDC client tag (no V: part)
-
 
 
 WISHLIST
@@ -21,8 +13,6 @@ WISHLIST
 
 - automatic markdown bold/italic formatting
 
-- support changing nick (via reconnecting)
-
 - support WHOIS
 
 - respond to CTCP VERSION with the clienttag on behalf of other users

server.go

@@ -57,6 +57,7 @@ type Server struct {
 
 	recievedFirstServerMessage bool
 	recievedCtcpVersion        bool
+	nickChangeAttempt          int
 }
 
 func NewServer(name string, upstream libnmdc.HubAddress, conn net.Conn) *Server {
@@ -245,8 +246,18 @@ func (s *Server) upstreamWorker() {
 					s.sendNames() // delay doing this until now
 				}
 				if hubEvent.StateChange == libnmdc.CONNECTIONSTATE_DISCONNECTED {
-					// Abandon thread. Don't try to autoreconnect at our level, the remote client can be responsible for that
+					if s.nickChangeAttempt > 0 {
-					s.DisconnectClient()
+						// If this was a nick change, reconnect /immediately/
+						s.upstream = nil
+						s.clientState = CSRegistered
+						s.maybeStartUpstream() // launches new goroutine
+
+					} else {
+						// Abandon thread. Don't try to autoreconnect at our level, the remote client can be responsible for that
+						s.DisconnectClient()
+
+					}
+					return
 				}
 
 			case libnmdc.EVENT_HUBNAME_CHANGED:
@@ -333,6 +344,18 @@ func (s *Server) handleCommand(command string, args []string) {
 			// Required for compatibility with Lite IRC, which sends USER/NICK in the wrong order
 
 		} else {
+
+			s.ClientStateLock.Lock()
+			defer s.ClientStateLock.Unlock()
+			if s.upstream == nil {
+				// Not yet connected, should be safe to change nick
+				s.upstreamLauncher.Self.Nick = args[0]
+			} else {
+				// Need to disconnect/reconnect the upstream
+				s.nickChangeAttempt++
+				s.upstream.Disconnect()
+			}
+
 			s.reply(rplKill, "Can't change nicks on this server.")
 			s.DisconnectClient()
 		}