7b499263af
Allow initialize cluster with random ports that are ununsed (at the moment of initialization)
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
// Package cmdutils contains utilities to facilitate building of command line
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// applications launching cluster peers.
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package cmdutils
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import (
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"fmt"
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"net"
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ma "github.com/multiformats/go-multiaddr"
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)
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// RandomizePorts replaces TCP and UDP ports with random, but valid port
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// values.
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func RandomizePorts(m ma.Multiaddr) (ma.Multiaddr, error) {
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var prev string
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var err error
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components := []ma.Multiaddr{}
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ma.ForEach(m, func(c ma.Component) bool {
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code := c.Protocol().Code
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if code != ma.P_TCP && code != ma.P_UDP {
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components = append(components, &c)
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prev = c.Value()
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return true
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}
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var ln net.Listener
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ln, err = net.Listen(c.Protocol().Name, prev+":")
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if err != nil {
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return false
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}
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defer ln.Close()
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var c1 *ma.Component
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c1, err = ma.NewComponent(c.Protocol().Name, fmt.Sprintf("%d", getPort(ln, code)))
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if err != nil {
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return false
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}
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components = append(components, c1)
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prev = c.Value()
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return true
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})
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return ma.Join(components...), err
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}
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func getPort(ln net.Listener, code int) int {
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if code == ma.P_TCP {
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return ln.Addr().(*net.TCPAddr).Port
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}
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if code == ma.P_UDP {
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return ln.Addr().(*net.UDPAddr).Port
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}
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return 0
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}
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