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package hub
import (
"globster/adc"
"blicky.net/tanja"
"net"
"time"
)
// TODO: Do write()s in a separate goroutine.
type hub struct {
name string
ses *tanja.Session
// Only set in the connected state, nil otherwise.
conn net.Conn
// Channel for the asynchronous connect. Only set in the connecting state,
// otherwise nil. Only one value is written to the channel, a net.Conn on
// success or an error otherwise.
connCh <-chan interface{}
}
func newHub(node *tanja.Node, name string) *hub {
s := &hub{name: name, ses: node.Session()}
s.ses.RegRPC(s, func(s string) tanja.Tuple {
if s[0] != 'T' {
return nil
}
return tanja.Tup("hub", name, s[1:])
})
s.ses.Send(false, "hub", name, "Created")
go func() {
for {
select {
case m, ok := <-s.ses.Chan():
if !ok {
return
}
m.Dispatch()
case c := <-s.connCh:
s.connected(c)
}
}
s.ses.Run()
}()
return s
}
func (s *hub) Texists(m *tanja.Message) {
m.Reply(s.name)
m.Close()
}
func (s *hub) Tconnect(addr string) {
if s.conn != nil || s.connCh != nil {
return
}
ch := make(chan interface{}, 2)
s.connCh = ch
go func() {
c, e := net.DialTimeout("tcp", addr, 30*time.Second)
if e != nil {
ch <- e
} else {
ch <- c
}
}()
}
// Sending 'disconnect' will immediately put the hub into disconnected state,
// but the actual disconnect from the hub may take a while. The "Disconnected"
// notification is sent immediately, but the return path is only closed after
// the disconnect has been completed.
func (s *hub) Tdisconnect(m *tanja.Message, r ...tanja.Element) {
s.ses.Sendt(false, append(tanja.Tup("hub", s.name, "Disconnected"), r...))
if s.connCh != nil {
// If we're in the connecting state, set connCh to nil so we won't be
// getting its result. In case the connection was successful, make sure
// to immediately disconnect again.
go func(ch <-chan interface{}) {
if c, ok := (<-ch).(net.Conn); ok {
c.Close()
}
}(s.connCh)
s.connCh = nil
m.Close()
} else if s.conn != nil {
// If we're connected, close the connection.
go func(c net.Conn) {
c.Close()
m.Close()
}(s.conn)
s.conn = nil
} else {
m.Close()
}
}
func (s *hub) connected(r interface{}) {
s.connCh = nil
switch v := r.(type) {
case net.Conn:
s.conn = v
s.ses.Send(false, "hub", s.name, "Connected", s.conn.RemoteAddr().String())
adc.NewWriter(s.conn).Write(&adc.Message{Header: adc.SUP.SetType('I')})
case error:
s.ses.Send(false, "hub", s.name, "Disconnected", v.Error())
}
}
func (s *hub) close() {
r := s.ses.Send(true, "hub", s.name, "disconnect")
<-r.Chan()
r.Close()
s.ses.Close()
s.ses.Send(false, "hub", s.name, "Closed")
}
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