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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows plan9
package net
import (
"time"
)
// resolveAndDialChannel is the simple pure-Go implementation of
// resolveAndDial, still used on operating systems where the deadline
// hasn't been pushed down into the pollserver. (Plan 9 and some old
// versions of Windows)
func resolveAndDialChannel(net, addr string, localAddr Addr, deadline time.Time) (Conn, error) {
timeout := deadline.Sub(time.Now())
if timeout < 0 {
timeout = 0
}
t := time.NewTimer(timeout)
defer t.Stop()
type pair struct {
Conn
error
}
ch := make(chan pair, 1)
resolvedAddr := make(chan Addr, 1)
go func() {
ra, err := resolveAddr("dial", net, addr, noDeadline)
if err != nil {
ch <- pair{nil, err}
return
}
resolvedAddr <- ra // in case we need it for OpError
c, err := dial(net, addr, localAddr, ra, noDeadline)
ch <- pair{c, err}
}()
select {
case <-t.C:
// Try to use the real Addr in our OpError, if we resolved it
// before the timeout. Otherwise we just use stringAddr.
var ra Addr
select {
case a := <-resolvedAddr:
ra = a
default:
ra = &stringAddr{net, addr}
}
err := &OpError{
Op: "dial",
Net: net,
Addr: ra,
Err: &timeoutError{},
}
return nil, err
case p := <-ch:
return p.Conn, p.error
}
}
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