forked from networkservicemesh/networkservicemesh
/
tools.go
230 lines (204 loc) · 5.67 KB
/
tools.go
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// Copyright (c) 2018 Cisco and/or its affiliates.
//
// 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 tools
import (
"context"
"net"
"net/url"
"os"
"os/signal"
"regexp"
"strconv"
"strings"
"syscall"
"time"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// location of network namespace for a process
netnsfile = "/proc/self/ns/net"
// MaxSymLink is maximum length of Symbolic Link
MaxSymLink = 8192
)
type addrImpl struct {
addr string
network string
}
func (a *addrImpl) String() string {
return a.addr
}
func (a *addrImpl) Network() string {
return a.network
}
//NewAddr returns new net.Addr with network and address
func NewAddr(network, addr string) net.Addr {
return &addrImpl{
network: network,
addr: addr,
}
}
// GetCurrentNS discovers the namespace of a running process and returns in a string.
func GetCurrentNS() (string, error) {
buf := make([]byte, MaxSymLink)
numBytes, err := syscall.Readlink(netnsfile, buf)
if err != nil {
return "", err
}
link := string(buf[0:numBytes])
nsRegExp := regexp.MustCompile("net:\\[(.*)\\]")
submatches := nsRegExp.FindStringSubmatch(link)
if len(submatches) >= 1 {
return submatches[1], nil
}
return "", errors.New("namespace is not found")
}
// GetCurrentPodNameFromHostname returns pod name a container is running in
// Note: Pod name is read from `/etc/hostname`. The same approach is used in
// kubelet implementation. There is risk that host name may be overwritten
// and in that case this should be considered when referring to pod name
func GetCurrentPodNameFromHostname() (string, error) {
podName, err := os.Hostname()
return podName, err
}
// SocketCleanup check for the presence of a stale socket and if it finds it, removes it.
func SocketCleanup(listenEndpoint string) error {
fi, err := os.Stat(listenEndpoint)
if err == nil && (fi.Mode()&os.ModeSocket) != 0 {
if err := os.Remove(listenEndpoint); err != nil {
return errors.Wrapf(err, "cannot remove listen endpoint %s", listenEndpoint)
}
}
if err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "failure stat of socket file %s", listenEndpoint)
}
return nil
}
// Unix socket file path.
type SocketPath string
func (socket SocketPath) Network() string {
return "unix"
}
func (socket SocketPath) String() string {
return string(socket)
}
func NewOSSignalChannel() chan os.Signal {
c := make(chan os.Signal, 1)
signal.Notify(c,
os.Interrupt,
// More Linux signals here
syscall.SIGHUP,
syscall.SIGTERM,
syscall.SIGQUIT)
return c
}
// WaitForPortAvailable waits while the port will is available. Throws exception if the context is done.
func WaitForPortAvailable(ctx context.Context, protoType, registryAddress string, idleSleep time.Duration) error {
if idleSleep < 0 {
return errors.New("idleSleep must be positive")
}
logrus.Infof("Waiting for liveness probe: %s:%s", protoType, registryAddress)
last := time.Now()
for {
select {
case <-ctx.Done():
return errors.New("timeout waiting for: " + protoType + ":" + registryAddress)
default:
var d net.Dialer
conn, err := d.DialContext(ctx, protoType, registryAddress)
if conn != nil {
_ = conn.Close()
}
if err == nil {
return nil
}
if time.Since(last) > time.Minute {
logrus.Infof("Waiting for liveness probe: %s:%s", protoType, registryAddress)
last = time.Now()
}
// Sleep to not overflow network
<-time.After(idleSleep)
}
}
}
func parseKV(kv, kvsep string) (string, string) {
keyValue := strings.Split(kv, kvsep)
if len(keyValue) != 2 {
keyValue = []string{"", ""}
}
return strings.Trim(keyValue[0], " "), strings.Trim(keyValue[1], " ")
}
// ParseKVStringToMap parses the input string
func ParseKVStringToMap(input, sep, kvsep string) map[string]string {
result := map[string]string{}
pairs := strings.Split(input, sep)
for _, pair := range pairs {
k, v := parseKV(pair, kvsep)
result[k] = v
}
return result
}
type NSUrl struct {
NsName string
Intf string
Params url.Values
}
func parseNSUrl(urlString string) (*NSUrl, error) {
result := &NSUrl{}
url, err := url.Parse(urlString)
if err != nil {
return nil, err
}
path := strings.Split(url.Path, "/")
if len(path) > 2 {
return nil, errors.New("Invalid NSUrl format")
}
if len(path) == 2 {
if len(path[1]) > 15 {
return nil, errors.New("Interface part cannot exceed 15 characters")
}
result.Intf = path[1]
}
result.NsName = path[0]
result.Params = url.Query()
return result, nil
}
func ParseAnnotationValue(value string) ([]*NSUrl, error) {
var result []*NSUrl
urls := strings.Split(value, ",")
for _, u := range urls {
nsurl, err := parseNSUrl(u)
if err != nil {
return nil, err
}
result = append(result, nsurl)
}
return result, nil
}
// ReadEnvBool reads environment variable and treat it as bool
func ReadEnvBool(env string, value bool) (bool, error) {
str := os.Getenv(env)
if str == "" {
return value, nil
}
return strconv.ParseBool(str)
}
// IsInsecure checks environment variable INSECURE
func IsInsecure() (bool, error) {
insecure, err := ReadEnvBool(InsecureEnv, insecureDefault)
if err != nil {
return false, errors.WithMessage(err, "unable to clarify secure or insecure mode")
}
return insecure, nil
}