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- // Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
- // released under the MIT license
-
- package irc
-
- import (
- "sync"
-
- "github.com/goshuirc/irc-go/ircmsg"
- )
-
- // 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)
- }
-
- func (mm *MonitorManager) Initialize() {
- mm.watching = make(map[*Client]map[string]bool)
- mm.watchedby = make(map[string]map[*Client]bool)
- }
-
- // AlertAbout alerts everyone monitoring `client`'s nick that `client` is now {on,off}line.
- func (manager *MonitorManager) AlertAbout(client *Client, online bool) {
- cfnick := client.NickCasefolded()
- nick := client.Nick()
- var watchers []*Client
- // safely copy the list of clients watching our nick
- manager.RLock()
- for client := range manager.watchedby[cfnick] {
- watchers = append(watchers, client)
- }
- manager.RUnlock()
-
- command := RPL_MONOFFLINE
- if online {
- command = RPL_MONONLINE
- }
-
- for _, mClient := range watchers {
- mClient.Send(nil, client.server.name, command, mClient.Nick(), nick)
- }
- }
-
- // Add registers `client` to receive notifications about `nick`.
- func (manager *MonitorManager) Add(client *Client, nick string, limit int) error {
- manager.Lock()
- defer manager.Unlock()
-
- if manager.watching[client] == nil {
- manager.watching[client] = make(map[string]bool)
- }
- if manager.watchedby[nick] == nil {
- manager.watchedby[nick] = make(map[*Client]bool)
- }
-
- if len(manager.watching[client]) >= limit {
- return errMonitorLimitExceeded
- }
-
- manager.watching[client][nick] = true
- manager.watchedby[nick][client] = true
- return nil
- }
-
- // Remove unregisters `client` from receiving notifications about `nick`.
- func (manager *MonitorManager) Remove(client *Client, nick string) error {
- manager.Lock()
- defer manager.Unlock()
- // deleting from nil maps is fine
- delete(manager.watching[client], nick)
- delete(manager.watchedby[nick], client)
- return nil
- }
-
- // RemoveAll unregisters `client` from receiving notifications about *all* nicks.
- func (manager *MonitorManager) RemoveAll(client *Client) {
- manager.Lock()
- defer manager.Unlock()
-
- for nick := range manager.watching[client] {
- delete(manager.watchedby[nick], client)
- }
- delete(manager.watching, client)
- }
-
- // List lists all nicks that `client` is registered to receive notifications about.
- func (manager *MonitorManager) List(client *Client) (nicks []string) {
- manager.RLock()
- defer manager.RUnlock()
- for nick := range manager.watching[client] {
- nicks = append(nicks, nick)
- }
- return nicks
- }
-
- var (
- monitorSubcommands = map[string]func(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool{
- "-": monitorRemoveHandler,
- "+": monitorAddHandler,
- "c": monitorClearHandler,
- "l": monitorListHandler,
- "s": monitorStatusHandler,
- }
- )
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