fix #1053, #1083

irc/monitor.go

@@ -12,25 +12,24 @@ import (
 // MonitorManager keeps track of who's monitoring which nicks.
 type MonitorManager struct {
 	sync.RWMutex // tier 2
-	// client -> nicks it's watching
-	watching map[*Client]map[string]bool
-	// nick -> clients watching it
-	watchedby map[string]map[*Client]bool
-	// (all nicks must be normalized externally by casefolding)
+	// client -> (casefolded nick it's watching -> uncasefolded nick)
+	watching map[*Session]map[string]string
+	// casefolded nick -> clients watching it
+	watchedby map[string]map[*Session]empty
 }
 
 func (mm *MonitorManager) Initialize() {
-	mm.watching = make(map[*Client]map[string]bool)
-	mm.watchedby = make(map[string]map[*Client]bool)
+	mm.watching = make(map[*Session]map[string]string)
+	mm.watchedby = make(map[string]map[*Session]empty)
 }
 
 // AlertAbout alerts everyone monitoring `client`'s nick that `client` is now {on,off}line.
 func (manager *MonitorManager) AlertAbout(nick, cfnick string, online bool) {
-	var watchers []*Client
+	var watchers []*Session
 	// safely copy the list of clients watching our nick
 	manager.RLock()
-	for client := range manager.watchedby[cfnick] {
-		watchers = append(watchers, client)
+	for session := range manager.watchedby[cfnick] {
+		watchers = append(watchers, session)
 	}
 	manager.RUnlock()
 
@@ -39,58 +38,67 @@ func (manager *MonitorManager) AlertAbout(nick, cfnick string, online bool) {
 		command = RPL_MONONLINE
 	}
 
-	for _, mClient := range watchers {
-		mClient.Send(nil, mClient.server.name, command, mClient.Nick(), nick)
+	for _, session := range watchers {
+		session.Send(nil, session.client.server.name, command, session.client.Nick(), nick)
 	}
 }
 
 // Add registers `client` to receive notifications about `nick`.
-func (manager *MonitorManager) Add(client *Client, nick string, limit int) error {
+func (manager *MonitorManager) Add(session *Session, nick string, limit int) error {
+	cfnick, err := CasefoldName(nick)
+	if err != nil {
+		return err
+	}
+
 	manager.Lock()
 	defer manager.Unlock()
 
-	if manager.watching[client] == nil {
-		manager.watching[client] = make(map[string]bool)
+	if manager.watching[session] == nil {
+		manager.watching[session] = make(map[string]string)
 	}
-	if manager.watchedby[nick] == nil {
-		manager.watchedby[nick] = make(map[*Client]bool)
+	if manager.watchedby[cfnick] == nil {
+		manager.watchedby[cfnick] = make(map[*Session]empty)
 	}
 
-	if len(manager.watching[client]) >= limit {
+	if len(manager.watching[session]) >= limit {
 		return errMonitorLimitExceeded
 	}
 
-	manager.watching[client][nick] = true
-	manager.watchedby[nick][client] = true
+	manager.watching[session][cfnick] = nick
+	manager.watchedby[cfnick][session] = empty{}
 	return nil
 }
 
 // Remove unregisters `client` from receiving notifications about `nick`.
-func (manager *MonitorManager) Remove(client *Client, nick string) error {
+func (manager *MonitorManager) Remove(session *Session, nick string) (err error) {
+	cfnick, err := CasefoldName(nick)
+	if err != nil {
+		return
+	}
+
 	manager.Lock()
 	defer manager.Unlock()
-	// deleting from nil maps is fine
-	delete(manager.watching[client], nick)
-	delete(manager.watchedby[nick], client)
+	delete(manager.watching[session], cfnick)
+	delete(manager.watchedby[cfnick], session)
 	return nil
 }
 
 // RemoveAll unregisters `client` from receiving notifications about *all* nicks.
-func (manager *MonitorManager) RemoveAll(client *Client) {
+func (manager *MonitorManager) RemoveAll(session *Session) {
 	manager.Lock()
 	defer manager.Unlock()
 
-	for nick := range manager.watching[client] {
-		delete(manager.watchedby[nick], client)
+	for cfnick := range manager.watching[session] {
+		delete(manager.watchedby[cfnick], session)
 	}
-	delete(manager.watching, client)
+	delete(manager.watching, session)
 }
 
 // List lists all nicks that `client` is registered to receive notifications about.
-func (manager *MonitorManager) List(client *Client) (nicks []string) {
+func (manager *MonitorManager) List(session *Session) (nicks []string) {
 	manager.RLock()
 	defer manager.RUnlock()
-	for nick := range manager.watching[client] {
+	for _, nick := range manager.watching[session] {
 		nicks = append(nicks, nick)
 	}
 	return nicks