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package proxy
import (
"sync"
"github.com/HimbeerserverDE/mt"
)
var (
modChanSubscribers map[string][]*ClientConn
modChanSubscriberMu sync.RWMutex
)
var (
onCltModChanMsg []func(string, *ClientConn, string) bool
onCltModChanMsgMu sync.RWMutex
onCltModChanMsgOnce sync.Once
)
// SendModChanMsg sends a message to all subscribed clients on a modchannel.
var (
onSrvModChanMsg []func(*ClientConn, string, string, string) bool
onSrvModChanMsgMu sync.RWMutex
onSrvModChanMsgOnce sync.Once
)
func SendModChanMsg(channel, msg string) {
modChanSubscriberMu.RLock()
defer modChanSubscriberMu.RUnlock()
subs, _ := modChanSubscribers[channel]
for _, cc := range subs {
cc.SendCmd(&mt.ToCltModChanMsg{
Channel: channel,
Msg: msg,
})
}
}
// JoinModChan attempts to subscribe to a modchannel, returning a channel
// that yields a boolean indicating success.
// The proxy will try to rejoin the channel after switching servers,
// but this is not guaranteed to succeed and errors will not be reported
// to the caller.
// This condition can be checked against using the IsModChanJoined method.
// This method may block indefinitely if the client switches servers
// before a response is received. If this cannot be controlled,
// using a select statement with a timeout is recommended.
func (cc *ClientConn) JoinModChan(channel string) <-chan bool {
failCh := make(chan bool)
failCh <- false
sc := cc.server()
if sc == nil {
return failCh
}
successCh := make(chan bool)
sc.modChanJoinChMu.Lock()
defer sc.modChanJoinChMu.Unlock()
if sc.modChanJoinChs[channel] == nil {
sc.modChanJoinChs[channel] = make(map[chan bool]struct{})
}
sc.modChanJoinChs[channel][successCh] = struct{}{}
sc.SendCmd(&mt.ToSrvJoinModChan{Channel: channel})
return successCh
}
// LeaveModChan attempts to unscribe from a modchannel, returning a channel
// yielding a boolean indicating success.
func (cc *ClientConn) LeaveModChan(channel string) <-chan bool {
failCh := make(chan bool)
failCh <- false
sc := cc.server()
if sc == nil {
return failCh
}
successCh := make(chan bool)
sc.modChanLeaveChMu.Lock()
defer sc.modChanLeaveChMu.Unlock()
if sc.modChanLeaveChs[channel] == nil {
sc.modChanLeaveChs[channel] = make(map[chan bool]struct{})
}
sc.modChanLeaveChs[channel][successCh] = struct{}{}
sc.SendCmd(&mt.ToSrvLeaveModChan{Channel: channel})
return successCh
}
// IsModChanJoined returns whether this client is currently subscribed
// to the specified modchannel. This is mainly useful for tracking success
// across server hops.
func (cc *ClientConn) IsModChanJoined(channel string) bool {
cc.modChsMu.RLock()
defer cc.modChsMu.RUnlock()
_, ok := cc.modChs[channel]
return ok
}
// SendModChanMsg sends a message to the current upstream server
// and all subscribed clients connected to it on a modchannel.
func (cc *ClientConn) SendModChanMsg(channel, msg string) bool {
sc := cc.server()
if sc == nil {
return false
}
sc.SendCmd(&mt.ToSrvMsgModChan{
Channel: channel,
Msg: msg,
})
return true
}
// RegisterOnCltModChanMsg registers a handler that is called
// when a client sends a message on a modchannel.
// If any handler returns true, the message is not forwarded
// to the upstream server.
func RegisterOnCltModChanMsg(handler func(string, *ClientConn, string) bool) {
onCltModChanMsgMu.Lock()
defer onCltModChanMsgMu.Unlock()
onCltModChanMsg = append(onCltModChanMsg, handler)
}
// RegisterOnSrvModChanMsg registers a handler that is called
// when another client of the current upstream server or a server mod
// sends a message on a modchannel.
// If any handler returns true, the message is not forwarded to the client.
func RegisterOnSrvModChanMsg(handler func(*ClientConn, string, string, string) bool) {
onSrvModChanMsgMu.Lock()
defer onSrvModChanMsgMu.Unlock()
onSrvModChanMsg = append(onSrvModChanMsg, handler)
}
func cltLeaveModChan(cc *ClientConn, channel string) {
modChanSubscriberMu.Lock()
defer modChanSubscriberMu.Unlock()
for i, sub := range modChanSubscribers[channel] {
if sub == cc {
modChanSubscribers[channel] = append(modChanSubscribers[channel][:i], modChanSubscribers[channel][i+1:]...)
break
}
}
}
func cltLeaveModChans(cc *ClientConn) {
modChanSubscriberMu.Lock()
defer modChanSubscriberMu.Unlock()
for ch := range modChanSubscribers {
for i, sub := range modChanSubscribers[ch] {
if sub == cc {
modChanSubscribers[ch] = append(modChanSubscribers[ch][:i], modChanSubscribers[ch][i+1:]...)
break
}
}
}
}
func handleCltModChanMsg(cc *ClientConn, cmd *mt.ToSrvMsgModChan) bool {
onCltModChanMsgMu.RLock()
defer onCltModChanMsgMu.RUnlock()
subs, _ := modChanSubscribers[cmd.Channel]
for _, sub := range subs {
sub.SendCmd(&mt.ToCltModChanMsg{
Channel: cmd.Channel,
Sender: cc.Name(),
Msg: cmd.Msg,
})
}
drop := false
for _, handler := range onCltModChanMsg {
if handler(cmd.Channel, cc, cmd.Msg) {
drop = true
}
}
return drop
}
func handleSrvModChanMsg(cc *ClientConn, cmd *mt.ToCltModChanMsg) bool {
onSrvModChanMsgMu.RLock()
defer onSrvModChanMsgMu.RUnlock()
drop := false
for _, handler := range onSrvModChanMsg {
if handler(cc, cmd.Channel, cmd.Sender, cmd.Msg) {
drop = true
}
}
return drop
}
func init() {
modChanSubscribers = make(map[string][]*ClientConn)
}
|
