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fix get port used #475

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merged 1 commit into from
Apr 12, 2023
Merged

fix get port used #475

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22 changes: 14 additions & 8 deletions pkg/utils/net/unused_port.go
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Original file line number Diff line number Diff line change
Expand Up @@ -29,19 +29,25 @@ var (

// GetUnusedPort returns an unused port on the local machine.
func GetUnusedPort(ctx context.Context) (port uint32, err error) {
var listener net.Listener
for lastUsedPort > 10000 && ctx.Err() == nil {
lastUsedPort--
listener, err = net.Listen("tcp", fmt.Sprintf(":%d", lastUsedPort))
if err == nil {
break
if isPortUnused(lastUsedPort) {
return lastUsedPort, nil
}
}

if listener == nil {
return 0, fmt.Errorf("%w: %v", errGetUnusedPort, err)
}
return 0, fmt.Errorf("%w: %v", errGetUnusedPort, err)
}

func isPortUnused(port uint32) bool {
return isHostPortUnused("127.0.0.1", port) && isHostPortUnused("", port)
}

func isHostPortUnused(host string, port uint32) bool {
listener, err := net.Listen("tcp", fmt.Sprintf("%v:%d", host, port))
if err != nil {
return false
}
_ = listener.Close()
return lastUsedPort, nil
return true
}