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Fix various locks around joining, kicking and quitting

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This commit is contained in:
Daniel Oaks 2017-01-11 12:16:51 +10:00
parent 6f7c683247
commit c39bebc696
2 changed files with 42 additions and 18 deletions
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53
irc/channel.go
View File

@ -68,11 +68,23 @@ func NewChannel(s *Server, name string, addDefaultModes bool) *Channel {
func (channel *Channel) IsEmpty() bool {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
return channel.isEmptyNoMutex()
}
func (channel *Channel) isEmptyNoMutex() bool {
return len(channel.members) == 0
}
func (channel *Channel) Names(client *Client) {
currentNicks := channel.Nicks(client)
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
channel.namesNoMutex(client)
}
func (channel *Channel) namesNoMutex(client *Client) {
currentNicks := channel.nicksNoMutex(client)
// assemble and send replies
maxNamLen := 480 - len(client.server.name) - len(client.nick)
var buffer string
@ -101,6 +113,12 @@ func (channel *Channel) ClientIsAtLeast(client *Client, permission ChannelMode)
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
return channel.clientIsAtLeastNoMutex(client, permission)
}
func (channel *Channel) clientIsAtLeastNoMutex(client *Client, permission ChannelMode) bool {
// requires RLock()
// get voice, since it's not a part of ChannelPrivModes
if channel.members.HasMode(client, permission) {
return true
@ -141,10 +159,7 @@ func (modes ChannelModeSet) Prefixes(isMultiPrefix bool) string {
return prefixes
}
func (channel *Channel) Nicks(target *Client) []string {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
func (channel *Channel) nicksNoMutex(target *Client) []string {
isMultiPrefix := (target != nil) && target.capabilities[MultiPrefix]
isUserhostInNames := (target != nil) && target.capabilities[UserhostInNames]
nicks := make([]string, len(channel.members))
@ -218,12 +233,11 @@ func (channel *Channel) CheckKey(key string) bool {
func (channel *Channel) Join(client *Client, key string) {
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
if channel.members.Has(client) {
// already joined, no message?
return
}
channel.membersMutex.Unlock()
if channel.IsFull() {
client.Send(nil, client.server.name, ERR_CHANNELISFULL, channel.name, "Cannot join channel (+l)")
@ -241,6 +255,8 @@ func (channel *Channel) Join(client *Client, key string) {
return
}
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
if channel.lists[BanMask].Match(client.nickMaskCasefolded) &&
!isInvited &&
!channel.lists[ExceptMask].Match(client.nickMaskCasefolded) {
@ -270,8 +286,8 @@ func (channel *Channel) Join(client *Client, key string) {
} else {
client.Send(nil, client.nickMaskString, "JOIN", channel.name)
}
channel.GetTopic(client)
channel.Names(client)
channel.getTopicNoMutex(client) // we already have Lock
channel.namesNoMutex(client)
}
func (channel *Channel) Part(client *Client, message string) {
@ -293,6 +309,10 @@ func (channel *Channel) GetTopic(client *Client) {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
channel.getTopicNoMutex(client)
}
func (channel *Channel) getTopicNoMutex(client *Client) {
if !channel.members.Has(client) {
client.Send(nil, client.server.name, ERR_NOTONCHANNEL, client.nick, channel.name, "You're not on that channel")
return
@ -507,23 +527,26 @@ func (channel *Channel) Quit(client *Client) {
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
channel.quitNoMutex(client)
}
func (channel *Channel) quitNoMutex(client *Client) {
channel.members.Remove(client)
client.channels.Remove(channel)
if channel.IsEmpty() {
if channel.isEmptyNoMutex() {
channel.server.channels.Remove(channel)
}
}
func (channel *Channel) Kick(client *Client, target *Client, comment string) {
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
func (channel *Channel) kickNoMutex(client *Client, target *Client, comment string) {
// needs a Lock()
if !(client.flags[Operator] || channel.members.Has(client)) {
client.Send(nil, client.server.name, ERR_NOTONCHANNEL, channel.name, "You're not on that channel")
return
}
if !channel.ClientIsAtLeast(client, ChannelOperator) {
if !channel.clientIsAtLeastNoMutex(client, ChannelOperator) {
client.Send(nil, client.server.name, ERR_CANNOTSENDTOCHAN, channel.name, "Cannot send to channel")
return
}
@ -539,7 +562,7 @@ func (channel *Channel) Kick(client *Client, target *Client, comment string) {
for member := range channel.members {
member.Send(nil, client.nickMaskString, "KICK", channel.name, target.nick, comment)
}
channel.Quit(target)
channel.quitNoMutex(target)
}
func (channel *Channel) Invite(invitee *Client, inviter *Client) {

7
irc/server.go
View File

@ -1381,8 +1381,7 @@ func kickHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
// make sure client has privs to kick the given user
//TODO(dan): split this into a separate function that checks if users have privs
// over other users, useful for things like -aoh as well
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
channel.membersMutex.Lock()
var hasPrivs bool
for _, mode := range ChannelPrivModes {
@ -1404,10 +1403,12 @@ func kickHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
if comment == "" {
comment = nickname
}
channel.Kick(client, target, comment)
channel.kickNoMutex(client, target, comment)
} else {
client.Send(nil, client.server.name, ERR_CHANOPRIVSNEEDED, chname, "You're not a channel operator")
}
channel.membersMutex.Unlock()
}
return false
}