/
utils.go
141 lines (118 loc) · 3.18 KB
/
utils.go
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// Copyright (c) 2017 Che Wei, Lin
//
// 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 (
"context"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/pkg/transport"
"time"
"encoding/binary"
"fmt"
"github.com/containernetworking/plugins/pkg/ip"
"net"
"strings"
)
func PowTwo(times int) uint32 {
if times == 0 {
return uint32(1)
}
var ans uint32
ans = 1
for i := 0; i < times; i++ {
ans *= 2
}
return ans
}
func IpToInt(ip net.IP) (uint32, error) {
if v4 := ip.To4(); v4 != nil {
if len(ip) == 16 {
return binary.BigEndian.Uint32(ip[12:16]), nil
} else {
return binary.BigEndian.Uint32(ip[0:4]), nil
}
}
return 0, fmt.Errorf("IP should be ipv4 %v\n", ip)
}
func IntToIP(nn uint32) net.IP {
ip := make(net.IP, 4)
binary.BigEndian.PutUint32(ip, nn)
return ip
}
//We use the first IP as gateway address
func GetNextIP(ipn *net.IPNet) net.IP {
nid := ipn.IP.Mask(ipn.Mask)
return ip.NextIP(nid)
}
func GetIPByInt(ip net.IP, n uint32) net.IP {
i, _ := IpToInt(ip)
return IntToIP(i + n)
}
/*
ETCD Related
*/
func connectWithoutTLS(url string) (*clientv3.Client, error) {
cli, err := clientv3.New(clientv3.Config{
Endpoints: []string{url},
DialTimeout: 5 * time.Second,
})
return cli, err
}
func connectWithTLS(url, cert, key, trusted string) (*clientv3.Client, error) {
tlsInfo := transport.TLSInfo{
CertFile: cert,
KeyFile: key,
TrustedCAFile: trusted,
}
tlsConfig, err := tlsInfo.ClientConfig()
if err != nil {
return nil, err
}
cli, err := clientv3.New(clientv3.Config{
Endpoints: []string{url},
DialTimeout: 5 * time.Second,
TLS: tlsConfig,
})
return cli, err
}
func ConnectETCD(config *IPMConfig) (*clientv3.Client, error) {
var cli *clientv3.Client
var err error
if strings.HasPrefix(config.ETCDURL, "https") {
cli, err = connectWithTLS(config.ETCDURL, config.ETCDCertFile, config.ETCDKeyFile, config.ETCDTrustedCAFileFile)
} else {
cli, err = connectWithoutTLS(config.ETCDURL)
}
return cli,err
}
func DeleteKey(cli *clientv3.Client, prefix string) error {
_, err := cli.Delete(context.TODO(), prefix)
return err
}
func PutValue(cli *clientv3.Client,prefix, value string) error {
_, err := cli.Put(context.TODO(), prefix, value)
return err
}
func GetKeyValuesWithPrefix(cli *clientv3.Client, key string) (map[string]string, error) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
resp, err := cli.Get(ctx, key, clientv3.WithPrefix())
cancel()
if err != nil {
return nil, fmt.Errorf("Fetch etcd prefix error:%v", err)
}
results := make(map[string]string)
for _, ev := range resp.Kvs {
results[string(ev.Key)] = string(ev.Value)
}
return results, nil
}