mirror of
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52 lines
1.4 KiB
Go
52 lines
1.4 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"fmt"
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"net"
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"sort"
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)
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// byLastOctet implements sort.Interface used in sorting a list
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// of ip address by their last octet value.
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type byLastOctet []net.IP
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func (n byLastOctet) Len() int { return len(n) }
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func (n byLastOctet) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
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func (n byLastOctet) Less(i, j int) bool {
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return []byte(n[i].To4())[3] < []byte(n[j].To4())[3]
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}
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// sortIPsByOctet - returns a reverse sorted list of hosts based on the last octet value.
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func sortIPsByOctet(ips []string) error {
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var nips []net.IP
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for _, ip := range ips {
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nip := net.ParseIP(ip)
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if nip == nil {
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return fmt.Errorf("Unable to parse invalid ip %s", ip)
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}
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nips = append(nips, nip)
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}
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// Reverse sort ips by their last octet.
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sort.Sort(sort.Reverse(byLastOctet(nips)))
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for i, nip := range nips {
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ips[i] = nip.String()
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}
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return nil
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}
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