// Channel returns net.Conn or os.Error. It receives anything to mean close.
func Listen(addr string, fdlim *http.FDLimiter) (chan interface{}, os.Error) {
l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
cc := make(chan interface{})
go func() {
for {
_, sig := <-cc
if sig || closed(cc) {
l.Close()
return
}
if fdlim == nil || fdlim.LockOrTimeout(10e9) == nil {
c, err := l.Accept()
if err != nil {
if c != nil {
c.Close()
}
if fdlim != nil {
fdlim.Unlock()
}
l.Close()
cc <- err
return
}
if fdlim != nil {
cc <- http.NewConnRunOnClose(c, func() { fdlim.Unlock() })
} else {
cc <- c
}
} else {
log.Stderrf("accept, fd starvation\n")
}
} // for
}()
return cc, nil
}
func (y *Conn) Connect(addr string, fdlim *http.FDLimiter) (err os.Error) {
var alrm <-chan int
backoff := backoff.Backoff{
Lo: backoffLo,
Hi: backoffHi,
Ratio: backoffRatio,
Current: backoffLo,
Attempt: 0,
}
for {
if err = y.setRegime(regimeConnect); err != nil {
return err
}
if alrm != nil {
<-alrm
alrm = nil
}
var conn net.Conn
if fdlim.LockOrTimeout(timeForFD) == nil {
conn, err = net.Dial("tcp", "", addr)
if err == nil {
//fmt.Printf(term.FgGreen+"d·conn[%#p] —— connected\n"+term.Reset, y)
if err := conn.(*net.TCPConn).SetKeepAlive(true); err != nil {
//log.Stderrf("%#p d·conn —— cannot set tcp keepalive: %s", y, err)
fmt.Fprintf(os.Stderr, "tonika: warn: cannot set tcp keepalive\n")
}
conn = http.NewConnRunOnClose(conn, func() { fdlim.Unlock() })
if err = y.Attach(conn); err != nil {
conn.Close()
}
return err
}
fdlim.Unlock()
}
alrm = alarm.Ignite(backoff.Inc())
}
panic("unreachable")
}
