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io.go
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/
io.go
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// +build windows
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package windows
import (
"context"
"net"
"sync"
"time"
"github.com/Microsoft/go-winio"
"github.com/containerd/containerd/runtime"
"github.com/pkg/errors"
)
type pipeSet struct {
src runtime.IO
stdin net.Conn
stdout net.Conn
stderr net.Conn
}
// NewIO connects to the provided pipe addresses
func newPipeSet(ctx context.Context, io runtime.IO) (*pipeSet, error) {
var (
err error
c net.Conn
wg sync.WaitGroup
set = &pipeSet{src: io}
ch = make(chan error)
opened = 0
)
defer func() {
if err != nil {
go func() {
for i := 0; i < opened; i++ {
// Drain the channel to avoid leaking the goroutines
<-ch
}
close(ch)
wg.Wait()
set.Close()
}()
}
}()
for _, p := range [3]struct {
name string
open bool
conn *net.Conn
}{
{
name: io.Stdin,
open: io.Stdin != "",
conn: &set.stdin,
},
{
name: io.Stdout,
open: io.Stdout != "",
conn: &set.stdout,
},
{
name: io.Stderr,
open: !io.Terminal && io.Stderr != "",
conn: &set.stderr,
},
} {
if p.open {
wg.Add(1)
opened++
go func(name string, conn *net.Conn) {
dialTimeout := 3 * time.Second
c, err = winio.DialPipe(name, &dialTimeout)
if err != nil {
ch <- errors.Wrapf(err, "failed to connect to %s", name)
}
*conn = c
ch <- nil
wg.Done()
}(p.name, p.conn)
}
}
for i := 0; i < opened; i++ {
select {
case <-ctx.Done():
return nil, ctx.Err()
case e := <-ch:
if e != nil {
if err == nil {
err = e
} else {
err = errors.Wrapf(err, e.Error())
}
}
}
}
return set, err
}
// Close terminates all successfully dialed IO connections
func (p *pipeSet) Close() {
for _, cn := range []net.Conn{p.stdin, p.stdout, p.stderr} {
if cn != nil {
cn.Close()
}
}
}