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https://github.com/ergochat/ergo.git
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refactor channel join and part
This commit is contained in:
Shivaram Lingamneni
parent
22ec6139bf
commit
b97ae00fe3
172
irc/channel.go
172
irc/channel.go
@ -25,7 +25,6 @@ type Channel struct {
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key string
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members MemberSet
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membersCache []*Client // allow iteration over channel members without holding the lock
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membersCacheMutex sync.Mutex // tier 2; see `regenerateMembersCache`
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name string
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nameCasefolded string
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server *Server
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@ -33,6 +32,7 @@ type Channel struct {
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registeredFounder string
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registeredTime time.Time
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stateMutex sync.RWMutex // tier 1
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joinPartMutex sync.Mutex // tier 3
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topic string
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topicSetBy string
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topicSetTime time.Time
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@ -163,33 +163,19 @@ func (channel *Channel) IsRegistered() bool {
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return channel.registeredFounder != ""
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}
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func (channel *Channel) regenerateMembersCache(noLocksNeeded bool) {
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// this is eventually consistent even without holding stateMutex.Lock()
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// throughout the update; all updates to `members` while holding Lock()
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// have a serial order, so the call to `regenerateMembersCache` that
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// happens-after the last one will see *all* the updates. then,
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// `membersCacheMutex` ensures that this final read is correctly paired
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// with the final write to `membersCache`.
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if !noLocksNeeded {
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channel.membersCacheMutex.Lock()
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defer channel.membersCacheMutex.Unlock()
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channel.stateMutex.RLock()
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}
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func (channel *Channel) regenerateMembersCache() {
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channel.stateMutex.RLock()
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result := make([]*Client, len(channel.members))
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i := 0
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for client := range channel.members {
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result[i] = client
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i++
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}
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if !noLocksNeeded {
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channel.stateMutex.RUnlock()
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channel.stateMutex.Lock()
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}
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channel.stateMutex.RUnlock()
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channel.stateMutex.Lock()
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channel.membersCache = result
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if !noLocksNeeded {
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channel.stateMutex.Unlock()
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}
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channel.stateMutex.Unlock()
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}
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// Names sends the list of users joined to the channel to the given client.
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@ -381,110 +367,119 @@ func (channel *Channel) Join(client *Client, key string, rb *ResponseBuffer) {
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return
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}
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chname := channel.Name()
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if channel.IsFull() {
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rb.Add(nil, client.server.name, ERR_CHANNELISFULL, channel.name, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "l"))
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rb.Add(nil, client.server.name, ERR_CHANNELISFULL, chname, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "l"))
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return
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}
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if !channel.CheckKey(key) {
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rb.Add(nil, client.server.name, ERR_BADCHANNELKEY, channel.name, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "k"))
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rb.Add(nil, client.server.name, ERR_BADCHANNELKEY, chname, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "k"))
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return
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}
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isInvited := channel.lists[modes.InviteMask].Match(client.nickMaskCasefolded)
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if channel.flags.HasMode(modes.InviteOnly) && !isInvited {
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rb.Add(nil, client.server.name, ERR_INVITEONLYCHAN, channel.name, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "i"))
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rb.Add(nil, client.server.name, ERR_INVITEONLYCHAN, chname, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "i"))
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return
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}
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if channel.lists[modes.BanMask].Match(client.nickMaskCasefolded) &&
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!isInvited &&
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!channel.lists[modes.ExceptMask].Match(client.nickMaskCasefolded) {
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rb.Add(nil, client.server.name, ERR_BANNEDFROMCHAN, channel.name, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "b"))
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rb.Add(nil, client.server.name, ERR_BANNEDFROMCHAN, chname, fmt.Sprintf(client.t("Cannot join channel (+%s)"), "b"))
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return
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}
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client.server.logger.Debug("join", fmt.Sprintf("%s joined channel %s", client.nick, channel.name))
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client.server.logger.Debug("join", fmt.Sprintf("%s joined channel %s", client.nick, chname))
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for _, member := range channel.Members() {
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if member == client {
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if member.capabilities.Has(caps.ExtendedJoin) {
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rb.Add(nil, client.nickMaskString, "JOIN", channel.name, client.AccountName(), client.realname)
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} else {
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rb.Add(nil, client.nickMaskString, "JOIN", channel.name)
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}
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} else {
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if member.capabilities.Has(caps.ExtendedJoin) {
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member.Send(nil, client.nickMaskString, "JOIN", channel.name, client.AccountName(), client.realname)
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} else {
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member.Send(nil, client.nickMaskString, "JOIN", channel.name)
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}
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}
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}
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newChannel, givenMode := func() (newChannel bool, givenMode modes.Mode) {
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channel.joinPartMutex.Lock()
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defer channel.joinPartMutex.Unlock()
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channel.stateMutex.Lock()
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channel.members.Add(client)
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firstJoin := len(channel.members) == 1
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channel.stateMutex.Unlock()
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channel.regenerateMembersCache(false)
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func() {
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account := client.Account()
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channel.stateMutex.Lock()
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defer channel.stateMutex.Unlock()
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channel.members.Add(client)
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firstJoin := len(channel.members) == 1
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newChannel = firstJoin && channel.registeredFounder == ""
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if newChannel {
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givenMode = modes.ChannelOperator
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} else {
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givenMode = channel.accountToUMode[account]
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}
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if givenMode != 0 {
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channel.members[client].SetMode(givenMode, true)
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}
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}()
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channel.regenerateMembersCache()
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return
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}()
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client.addChannel(channel)
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account := client.Account()
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nick := client.Nick()
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nickmask := client.NickMaskString()
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realname := client.Realname()
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accountName := client.AccountName()
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var modestr string
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if givenMode != 0 {
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modestr = fmt.Sprintf("+%v", givenMode)
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}
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// give channel mode if necessary
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channel.stateMutex.Lock()
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newChannel := firstJoin && channel.registeredFounder == ""
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mode, persistentModeExists := channel.accountToUMode[account]
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var givenMode *modes.Mode
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if persistentModeExists {
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givenMode = &mode
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} else if newChannel {
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givenMode = &modes.ChannelOperator
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for _, member := range channel.Members() {
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if member == client {
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continue
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}
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if member.capabilities.Has(caps.ExtendedJoin) {
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member.Send(nil, nickmask, "JOIN", chname, accountName, realname)
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} else {
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member.Send(nil, nickmask, "JOIN", chname)
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}
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if givenMode != 0 {
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member.Send(nil, client.server.name, "MODE", chname, modestr, nick)
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}
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}
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if givenMode != nil {
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channel.members[client].SetMode(*givenMode, true)
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}
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channel.stateMutex.Unlock()
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if client.capabilities.Has(caps.ExtendedJoin) {
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rb.Add(nil, client.nickMaskString, "JOIN", channel.name, client.AccountName(), client.realname)
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rb.Add(nil, nickmask, "JOIN", chname, accountName, realname)
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} else {
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rb.Add(nil, client.nickMaskString, "JOIN", channel.name)
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rb.Add(nil, nickmask, "JOIN", chname)
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}
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// don't send topic when it's an entirely new channel
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if !newChannel {
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channel.SendTopic(client, rb)
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}
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channel.Names(client, rb)
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if givenMode != nil {
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for _, member := range channel.Members() {
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if member == client {
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rb.Add(nil, client.server.name, "MODE", channel.name, fmt.Sprintf("+%v", *givenMode), client.nick)
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} else {
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member.Send(nil, client.server.name, "MODE", channel.name, fmt.Sprintf("+%v", *givenMode), client.nick)
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}
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}
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if givenMode != 0 {
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rb.Add(nil, client.server.name, "MODE", chname, modestr, nick)
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}
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}
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// Part parts the given client from this channel, with the given message.
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func (channel *Channel) Part(client *Client, message string, rb *ResponseBuffer) {
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chname := channel.Name()
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if !channel.hasClient(client) {
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rb.Add(nil, client.server.name, ERR_NOTONCHANNEL, channel.name, client.t("You're not on that channel"))
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rb.Add(nil, client.server.name, ERR_NOTONCHANNEL, chname, client.t("You're not on that channel"))
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return
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}
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for _, member := range channel.Members() {
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if member == client {
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rb.Add(nil, client.nickMaskString, "PART", channel.name, message)
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} else {
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member.Send(nil, client.nickMaskString, "PART", channel.name, message)
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}
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}
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channel.Quit(client)
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client.server.logger.Debug("part", fmt.Sprintf("%s left channel %s", client.nick, channel.name))
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nickmask := client.NickMaskString()
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for _, member := range channel.Members() {
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member.Send(nil, nickmask, "PART", chname, message)
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}
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rb.Add(nil, nickmask, "PART", chname, message)
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client.server.logger.Debug("part", fmt.Sprintf("%s left channel %s", client.nick, chname))
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}
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// SendTopic sends the channel topic to the given client.
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@ -762,17 +757,22 @@ func (channel *Channel) applyModeMask(client *Client, mode modes.Mode, op modes.
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// Quit removes the given client from the channel
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func (channel *Channel) Quit(client *Client) {
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channel.stateMutex.Lock()
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channel.members.Remove(client)
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empty := len(channel.members) == 0
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channel.stateMutex.Unlock()
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channel.regenerateMembersCache(false)
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channelEmpty := func() bool {
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channel.joinPartMutex.Lock()
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defer channel.joinPartMutex.Unlock()
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client.removeChannel(channel)
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channel.stateMutex.Lock()
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channel.members.Remove(client)
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channelEmpty := len(channel.members) == 0
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channel.stateMutex.Unlock()
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channel.regenerateMembersCache()
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return channelEmpty
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}()
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if empty {
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if channelEmpty {
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client.server.channels.Cleanup(channel)
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}
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client.removeChannel(channel)
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}
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func (channel *Channel) Kick(client *Client, target *Client, comment string, rb *ResponseBuffer) {
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@ -409,16 +409,20 @@ func (client *Client) TryResume() {
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client.nick = oldClient.nick
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client.updateNickMaskNoMutex()
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for channel := range oldClient.channels {
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channel.stateMutex.Lock()
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rejoinChannel := func(channel *Channel) {
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channel.joinPartMutex.Lock()
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defer channel.joinPartMutex.Unlock()
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channel.stateMutex.Lock()
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client.channels[channel] = true
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client.resumeDetails.SendFakeJoinsFor = append(client.resumeDetails.SendFakeJoinsFor, channel.name)
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oldModeSet := channel.members[oldClient]
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channel.members.Remove(oldClient)
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channel.members[client] = oldModeSet
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channel.regenerateMembersCache(true)
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channel.stateMutex.Unlock()
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channel.regenerateMembersCache()
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// construct fake modestring if necessary
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oldModes := oldModeSet.String()
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@ -447,8 +451,10 @@ func (client *Client) TryResume() {
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member.Send(nil, server.name, "MODE", params...)
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}
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}
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}
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channel.stateMutex.Unlock()
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for channel := range oldClient.channels {
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rejoinChannel(channel)
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}
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server.clients.byNick[oldnick] = client
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