Merge pull request #1227 from slingamn/issue1225.2

fix #1225

irc/client.go

 	return
 }
 
-// updateNick updates `nick` and `nickCasefolded`.
-func (client *Client) updateNick(nick, nickCasefolded, skeleton string) {
+// SetNick gives the client a nickname and marks it as registered, if necessary
+func (client *Client) SetNick(nick, nickCasefolded, skeleton string) (success bool) {
 	client.stateMutex.Lock()
 	defer client.stateMutex.Unlock()
+	if client.destroyed {
+		return false
+	} else if !client.registered {
+		// XXX test this before setting it to avoid annoying the race detector
+		client.registered = true
+	}
 	client.nick = nick
 	client.nickCasefolded = nickCasefolded
 	client.skeleton = skeleton
 	client.updateNickMaskNoMutex()
+	return true
 }
 
 // updateNickMaskNoMutex updates the casefolded nickname and nickmask, not acquiring any mutexes.

irc/client_lookup_set.go

 		return "", errNicknameInUse, false
 	}
 
+	if changeSuccess := client.SetNick(newNick, newCfNick, newSkeleton); !changeSuccess {
+		return "", errClientDestroyed, false
+	}
 	clients.removeInternal(client)
 	clients.byNick[newCfNick] = client
 	clients.bySkeleton[newSkeleton] = client
-	client.updateNick(newNick, newCfNick, newSkeleton)
 	return newNick, nil, false
 }
 

irc/getters.go

 	return client.oper
 }
 
-func (client *Client) Registered() bool {
-	client.stateMutex.RLock()
-	defer client.stateMutex.RUnlock()
-	return client.registered
-}
-
-func (client *Client) SetRegistered() {
+func (client *Client) Registered() (result bool) {
 	// `registered` is only written from the client's own goroutine, but may be
 	// read from other goroutines; therefore, the client's own goroutine may read
 	// the value without synchronization, but must write it with synchronization,
 	// and other goroutines must read it with synchronization
-	client.stateMutex.Lock()
-	client.registered = true
-	client.stateMutex.Unlock()
+	client.stateMutex.RLock()
+	result = client.registered
+	client.stateMutex.RUnlock()
+	return
 }
 
 func (client *Client) RawHostname() (result string) {

irc/nickname.go

 		channel.AddHistoryItem(histItem, details.account)
 	}
 
-	if target.Registered() {
-		newCfnick := target.NickCasefolded()
-		if newCfnick != details.nickCasefolded {
-			client.server.monitorManager.AlertAbout(details.nick, details.nickCasefolded, false)
-			client.server.monitorManager.AlertAbout(assignedNickname, newCfnick, true)
-		}
-	} // else: these will be deferred to the end of registration (see #572)
+	newCfnick := target.NickCasefolded()
+	if newCfnick != details.nickCasefolded {
+		client.server.monitorManager.AlertAbout(details.nick, details.nickCasefolded, false)
+		client.server.monitorManager.AlertAbout(assignedNickname, newCfnick, true)
+	}
 	return nil
 }
 

irc/server.go

 		c.SetMode(defaultMode, true)
 	}
 
-	// registration has succeeded:
-	c.SetRegistered()
-
 	// count new user in statistics
 	server.stats.Register(c.HasMode(modes.Invisible))
-	server.monitorManager.AlertAbout(c.Nick(), c.NickCasefolded(), true)
 
 	server.playRegistrationBurst(session)
 	return false