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114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
// Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
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// released under the MIT license
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package irc
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import (
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"sync"
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"github.com/goshuirc/irc-go/ircmsg"
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)
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// MonitorManager keeps track of who's monitoring which nicks.
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type MonitorManager struct {
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sync.RWMutex // tier 2
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// client -> nicks it's watching
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watching map[*Client]map[string]bool
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// nick -> clients watching it
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watchedby map[string]map[*Client]bool
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// (all nicks must be normalized externally by casefolding)
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}
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// NewMonitorManager returns a new MonitorManager.
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func NewMonitorManager() *MonitorManager {
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mm := MonitorManager{
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watching: make(map[*Client]map[string]bool),
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watchedby: make(map[string]map[*Client]bool),
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}
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return &mm
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}
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// AlertAbout alerts everyone monitoring `client`'s nick that `client` is now {on,off}line.
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func (manager *MonitorManager) AlertAbout(client *Client, online bool) {
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cfnick := client.NickCasefolded()
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nick := client.Nick()
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var watchers []*Client
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// safely copy the list of clients watching our nick
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manager.RLock()
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for client := range manager.watchedby[cfnick] {
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watchers = append(watchers, client)
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}
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manager.RUnlock()
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command := RPL_MONOFFLINE
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if online {
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command = RPL_MONONLINE
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}
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for _, mClient := range watchers {
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mClient.Send(nil, client.server.name, command, mClient.Nick(), nick)
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}
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}
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// Add registers `client` to receive notifications about `nick`.
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func (manager *MonitorManager) Add(client *Client, nick string, limit int) error {
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manager.Lock()
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defer manager.Unlock()
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if manager.watching[client] == nil {
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manager.watching[client] = make(map[string]bool)
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}
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if manager.watchedby[nick] == nil {
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manager.watchedby[nick] = make(map[*Client]bool)
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}
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if len(manager.watching[client]) >= limit {
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return errMonitorLimitExceeded
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}
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manager.watching[client][nick] = true
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manager.watchedby[nick][client] = true
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return nil
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}
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// Remove unregisters `client` from receiving notifications about `nick`.
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func (manager *MonitorManager) Remove(client *Client, nick string) error {
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manager.Lock()
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defer manager.Unlock()
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// deleting from nil maps is fine
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delete(manager.watching[client], nick)
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delete(manager.watchedby[nick], client)
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return nil
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}
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// RemoveAll unregisters `client` from receiving notifications about *all* nicks.
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func (manager *MonitorManager) RemoveAll(client *Client) {
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manager.Lock()
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defer manager.Unlock()
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for nick := range manager.watching[client] {
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delete(manager.watchedby[nick], client)
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}
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delete(manager.watching, client)
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}
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// List lists all nicks that `client` is registered to receive notifications about.
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func (manager *MonitorManager) List(client *Client) (nicks []string) {
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manager.RLock()
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defer manager.RUnlock()
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for nick := range manager.watching[client] {
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nicks = append(nicks, nick)
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}
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return nicks
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}
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var (
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monitorSubcommands = map[string]func(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool{
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"-": monitorRemoveHandler,
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"+": monitorAddHandler,
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"c": monitorClearHandler,
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"l": monitorListHandler,
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"s": monitorStatusHandler,
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}
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)
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