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package org.pacien.tincapp.commands
import java8.util.concurrent.CompletableFuture
import java.io.BufferedReader
import java.io.IOException
import java.io.InputStream
import java.io.InputStreamReader
/**
* @author pacien
*/
internal object Executor {
class CommandExecutionException(msg: String) : Exception(msg)
init {
System.loadLibrary("exec")
}
/**
* @return -1 on error, forked child PID otherwise
*/
private external fun forkExec(argcv: Array<String>): Int
private fun read(stream: InputStream) = BufferedReader(InputStreamReader(stream)).readLines()
fun forkExec(cmd: Command) {
if (forkExec(cmd.asArray()) == -1) throw CommandExecutionException("Could not fork child process.")
}
fun call(cmd: Command): CompletableFuture<List<String>> {
val proc = try {
ProcessBuilder(cmd.asList()).start()
} catch (e: IOException) {
throw CommandExecutionException(e.message ?: "Could not start process.")
}
return CompletableFuture.supplyAsync<List<String>> {
if (proc.waitFor() == 0) read(proc.inputStream)
else throw CommandExecutionException(read(proc.errorStream).lastOrNull() ?: "Non-zero exit status.")
}
}
}
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