74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows plan9
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package net
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import (
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"time"
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)
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var testingIssue5349 bool // used during tests
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// resolveAndDialChannel is the simple pure-Go implementation of
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// resolveAndDial, still used on operating systems where the deadline
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// hasn't been pushed down into the pollserver. (Plan 9 and some old
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// versions of Windows)
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func resolveAndDialChannel(net, addr string, localAddr Addr, deadline time.Time) (Conn, error) {
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var timeout time.Duration
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if !deadline.IsZero() {
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timeout = deadline.Sub(time.Now())
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}
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if timeout <= 0 {
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ra, err := resolveAddr("dial", net, addr, noDeadline)
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if err != nil {
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return nil, err
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}
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return dial(net, addr, localAddr, ra, noDeadline)
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}
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t := time.NewTimer(timeout)
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defer t.Stop()
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type pair struct {
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Conn
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error
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}
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ch := make(chan pair, 1)
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resolvedAddr := make(chan Addr, 1)
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go func() {
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if testingIssue5349 {
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time.Sleep(time.Millisecond)
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}
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ra, err := resolveAddr("dial", net, addr, noDeadline)
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if err != nil {
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ch <- pair{nil, err}
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return
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}
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resolvedAddr <- ra // in case we need it for OpError
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c, err := dial(net, addr, localAddr, ra, noDeadline)
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ch <- pair{c, err}
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}()
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select {
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case <-t.C:
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// Try to use the real Addr in our OpError, if we resolved it
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// before the timeout. Otherwise we just use stringAddr.
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var ra Addr
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select {
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case a := <-resolvedAddr:
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ra = a
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default:
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ra = &stringAddr{net, addr}
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}
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err := &OpError{
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Op: "dial",
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Net: net,
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Addr: ra,
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Err: &timeoutError{},
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}
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return nil, err
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case p := <-ch:
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return p.Conn, p.error
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}
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}
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