fr.acinq.eclair.PortChecker.scala Maven / Gradle / Ivy
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/*
* Copyright 2019 ACINQ SAS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package fr.acinq.eclair
import java.net.{InetAddress, InetSocketAddress, ServerSocket}
import scala.util.{Failure, Success, Try}
object PortChecker {
/**
* Tests if a port is open
* See https://stackoverflow.com/questions/434718/sockets-discover-port-availability-using-java#435579
*
* @return
*/
def checkAvailable(host: String, port: Int): Unit = checkAvailable(InetAddress.getByName(host), port)
def checkAvailable(socketAddress: InetSocketAddress): Unit = checkAvailable(socketAddress.getAddress, socketAddress.getPort)
def checkAvailable(address: InetAddress, port: Int): Unit = {
Try(new ServerSocket(port, 50, address)) match {
case Success(socket) =>
Try(socket.close())
case Failure(_) =>
throw TCPBindException(port)
}
}
}
case class TCPBindException(port: Int) extends RuntimeException(s"could not bind to port $port")