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Fix getting a free socket on macos #420

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Fix getting a free socket on macos #420

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ae484c8
fix getting a free socket on macos
reimai Mar 25, 2025
80be654
free socket for windows; fmt
reimai Apr 10, 2025
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10 changes: 8 additions & 2 deletions bridge/src/main/scala/protocbridge/frontend/SocketBasedPluginFrontend.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2,21 +2,27 @@ package protocbridge.frontend

import protocbridge.{ExtraEnv, ProtocCodeGenerator}

import java.net.ServerSocket
import java.net.{InetAddress, ServerSocket}
import java.nio.file.{Files, Path}
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.{Future, blocking}

/** PluginFrontend for Windows and macOS where a server socket is used.
*/
abstract class SocketBasedPluginFrontend extends PluginFrontend {

case class InternalState(serverSocket: ServerSocket, shellScript: Path)

override def prepare(
plugin: ProtocCodeGenerator,
env: ExtraEnv
): (Path, InternalState) = {
val ss = new ServerSocket(0) // Bind to any available port.

/** we need to specify an address, otherwise it uses ANY (*.* in netstat)
* which does not conflict with existing 'localhost' sockets on macos,
* resulting in a conflict later on in MacPluginFrontend
*/
val ss = new ServerSocket(0, 50, InetAddress.getByName("127.0.0.1"))
val sh = createShellScript(ss.getLocalPort)

Future {
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