mirror of
https://github.com/ethereum/go-ethereum.git
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3c94dfb25f
* initial commit * safe latest error * remove json listener * fix: debug block unit test * remove jsonrpc listener from server * fix: consume network's find port in heimdall client test * update key in log while startup * linters * fix Co-authored-by: Manav Darji <manavdarji.india@gmail.com>
36 lines
587 B
Go
36 lines
587 B
Go
package network
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import (
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"errors"
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"fmt"
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"net"
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)
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const (
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maxPortCheck = 100
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emptyPort = "127.0.0.1:0"
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)
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var (
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ErrCantFindAPort = errors.New("no available port found")
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)
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// FindAvailablePort returns the an available port
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func FindAvailablePort() (int, net.Listener, error) {
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var (
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listener net.Listener
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err error
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)
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for i := uint(0); i < maxPortCheck; i++ {
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listener, err = net.Listen("tcp", emptyPort)
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if err != nil {
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continue
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}
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return listener.Addr().(*net.TCPAddr).Port, listener, nil
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}
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return 0, nil, fmt.Errorf("%w: %s", ErrCantFindAPort, err)
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}
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