ammonite.sshd.SshdRepl.scala Maven / Gradle / Ivy

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ammonite-sshd
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package ammonite.sshd


import java.io.{InputStream, OutputStream, PrintStream}

import ammonite.Main
import ammonite.ops.Path
import ammonite.runtime.Storage
import ammonite.sshd.util.Environment
import ammonite.util.{Bind, Colors}

/**
 * An ssh server which serves ammonite repl as it's shell channel.
 * To start listening for incoming connections call
 * [[start()]] method. You can [[stop()]] the server at any moment.
 * It will also close all running sessions
 * @param sshConfig configuration of ssh server,
 *                  such as users credentials or port to be listening to
 * @param predef predef that will be installed on repl instances served by this server
 * @param replArgs arguments to pass to ammonite repl on initialization of the session;
 *                 an argument named "session" containing the SSHD session will be added
 * @param classLoader classloader for ammonite to use
 */
class SshdRepl(sshConfig: SshServerConfig,
               predef: String = "",
               defaultPredef: Boolean = true,
               wd: Path = ammonite.ops.pwd,
               replArgs: Seq[Bind[_]] = Nil,
               classLoader: ClassLoader = SshdRepl.getClass.getClassLoader) {
  private lazy val sshd = SshServer(
    sshConfig,
    shellServer = SshdRepl.runRepl(
      sshConfig.ammoniteHome,
      predef,
      defaultPredef,
      wd,
      replArgs,
      classLoader
    )
  )

  def port = sshd.getPort
  def start(): Unit = sshd.start()
  def stop(): Unit = sshd.stop()
  def stopImmediately(): Unit = sshd.stop(true)
}


object SshdRepl {
  // Actually runs a repl inside of session serving a remote user shell.
  private def runRepl(homePath: Path,
                      predefCode: String,
                      defaultPredef: Boolean,
                      wd: Path,
                      replArgs: Seq[Bind[_]],
                      replServerClassLoader: ClassLoader)
                     (in: InputStream, out: OutputStream): Unit = {
    // since sshd server has it's own customised environment,
    // where things like System.out will output to the
    // server's console, we need to prepare individual environment
    // to serve this particular user's session

    Environment.withEnvironment(Environment(replServerClassLoader, in, out)) {
      try {
        Main(
          predefCode = predefCode,
          predefFile = None,
          defaultPredef = defaultPredef,
          storageBackend = new Storage.Folder(homePath),
          wd = wd,
          inputStream = in, outputStream = out, errorStream = out,
          verboseOutput = false,
          remoteLogging = false,
          colors = Colors.Default
        ).run(replArgs:_*)
      } catch {
        case any: Throwable =>
          val sshClientOutput = new PrintStream(out)
          sshClientOutput.println("What a terrible failure, the REPL just blow up!")
          any.printStackTrace(sshClientOutput)
      }
    }
  }
}