/
utils.go
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/
utils.go
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/*
Copyright 2017 Mirantis
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 utils
import (
"net"
"net/url"
"os"
"strconv"
"time"
"github.com/golang/glog"
knet "k8s.io/apimachinery/pkg/util/net"
)
const (
// FIXME: make the following configurable
// connect timeout when waiting for the socket to become available
connectWaitTimeout = 500 * time.Millisecond
connectAttemptInterval = 500 * time.Millisecond
)
// dial creates a net.Conn by unix socket addr.
func Dial(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("unix", addr, timeout)
}
func WaitForSocket(path string, maxAttempts int, extraCheck func() error) error {
var err error
var conn net.Conn
for n := 0; maxAttempts < 0 || n < maxAttempts; n++ {
if _, err = os.Stat(path); err != nil {
glog.V(1).Infof("attempt %d: %q is not here yet: %v", n, path, err)
} else if conn, err = Dial(path, connectWaitTimeout); err != nil {
glog.V(1).Infof("attempt %d: can't connect to %q yet: %v", n, path, err)
} else {
conn.Close()
if extraCheck != nil {
err = extraCheck()
if err != nil {
glog.V(1).Infof("attempt %d: extra check failed for %q: %v", n, path, err)
continue
}
}
break
}
time.Sleep(connectAttemptInterval)
}
return err
}
func GetStreamUrl(port int) (*url.URL, error) {
bindAddress, err := knet.ChooseBindAddress(net.IP{0, 0, 0, 0})
if err != nil {
return nil, err
}
return &url.URL{
Scheme: "http",
Host: net.JoinHostPort(bindAddress.String(), strconv.Itoa(port)),
}, nil
}