forked from andyleap/go-ssb
/
messagetopic.go
67 lines (58 loc) · 1.19 KB
/
messagetopic.go
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package ssb
import "sync"
type MessageTopic struct {
lock sync.Mutex
recps map[chan *SignedMessage]bool
Send chan *SignedMessage
}
func NewMessageTopic() *MessageTopic {
mt := &MessageTopic{Send: make(chan *SignedMessage, 10), recps: map[chan *SignedMessage]bool{}}
go mt.process()
return mt
}
func (mt *MessageTopic) Close() {
close(mt.Send)
}
func (mt *MessageTopic) process() {
for m := range mt.Send {
func() {
mt.lock.Lock()
defer mt.lock.Unlock()
for recp, strict := range mt.recps {
if strict {
recp <- m
} else {
select {
case recp <- m:
default:
delete(mt.recps, recp)
close(recp)
}
}
}
}()
}
mt.lock.Lock()
defer mt.lock.Unlock()
for recp := range mt.recps {
delete(mt.recps, recp)
close(recp)
}
}
func (mt *MessageTopic) Register(recp chan *SignedMessage, strict bool) chan *SignedMessage {
mt.lock.Lock()
defer mt.lock.Unlock()
if recp == nil {
recp = make(chan *SignedMessage, 1)
}
mt.recps[recp] = strict
return recp
}
func (mt *MessageTopic) Unregister(recp chan *SignedMessage) {
mt.lock.Lock()
defer mt.lock.Unlock()
if _, ok := mt.recps[recp]; ok {
delete(mt.recps, recp)
close(recp)
}
}