63 lines
2.1 KiB
Go
63 lines
2.1 KiB
Go
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/*
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* Copyright (c) 2015 The btcsuite developers
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package cfgutil
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import "net"
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// NormalizeAddress returns the normalized form of the address, adding a default
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// port if necessary. An error is returned if the address, even without a port,
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// is not valid.
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func NormalizeAddress(addr string, defaultPort string) (hostport string, err error) {
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// If the first SplitHostPort errors because of a missing port and not
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// for an invalid host, add the port. If the second SplitHostPort
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// fails, then a port is not missing and the original error should be
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// returned.
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host, port, origErr := net.SplitHostPort(addr)
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if origErr == nil {
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return net.JoinHostPort(host, port), nil
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}
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addr = net.JoinHostPort(addr, defaultPort)
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_, _, err = net.SplitHostPort(addr)
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if err != nil {
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return "", origErr
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}
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return addr, nil
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}
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// NormalizeAddresses returns a new slice with all the passed peer addresses
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// normalized with the given default port, and all duplicates removed.
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func NormalizeAddresses(addrs []string, defaultPort string) ([]string, error) {
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var (
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normalized = make([]string, 0, len(addrs))
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seenSet = make(map[string]struct{})
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)
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for _, addr := range addrs {
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normalizedAddr, err := NormalizeAddress(addr, defaultPort)
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if err != nil {
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return nil, err
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}
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_, seen := seenSet[normalizedAddr]
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if !seen {
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normalized = append(normalized, normalizedAddr)
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seenSet[normalizedAddr] = struct{}{}
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}
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}
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return normalized, nil
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}
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