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minio/host-to-ip.go

42 lines
1.3 KiB

/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* 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 main
import (
"net"
"sort"
)
// byLastOctet implements sort.Interface used in sorting a list
// of ip address by their last octet value.
type byLastOctet []net.IP
func (n byLastOctet) Len() int { return len(n) }
func (n byLastOctet) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
func (n byLastOctet) Less(i, j int) bool {
return []byte(n[i].To4())[3] < []byte(n[j].To4())[3]
}
// getIPsFromHosts - returns a reverse sorted list of ips based on the last octet value.
func getIPsFromHosts(hosts []string) (ips []net.IP) {
for _, host := range hosts {
ips = append(ips, net.ParseIP(host))
}
// Reverse sort ips by their last octet.
sort.Sort(sort.Reverse(byLastOctet(ips)))
return ips
}