152 lines
4.5 KiB
Scala
152 lines
4.5 KiB
Scala
/*
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* Shadowsocks - A shadowsocks client for Android
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* Copyright (C) 2016 <max.c.lv@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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* ___====-_ _-====___
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* _--^^^#####// \\#####^^^--_
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* _-^##########// ( ) \\##########^-_
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* -############// |\^^/| \\############-
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* _/############// (@::@) \\############\_
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* /#############(( \\// ))#############\
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* -###############\\ (oo) //###############-
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* -#################\\ / VV \ //#################-
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* -###################\\/ \//###################-
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* _#/|##########/\######( /\ )######/\##########|\#_
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* |/ |#/\#/\#/\/ \#/\##\ | | /##/\#/ \/\#/\#/\#| \|
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* ` |/ V V ` V \#\| | | |/#/ V ' V V \| '
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* ` ` ` ` / | | | | \ ' ' ' '
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* ( | | | | )
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* __\ | | | | /__
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* (vvv(VVV)(VVV)vvv)
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*
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* HERE BE DRAGONS
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*
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*/
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package com.github.shadowsocks
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import java.io._
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import java.lang.System.currentTimeMillis
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import java.util.concurrent.Semaphore
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import android.util.Log
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import scala.collection.JavaConversions._
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import scala.collection.immutable.Stream
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import scala.util.control.Exception._
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class StreamLogger(is: InputStream, tag: String) extends Thread {
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def withCloseable[T <: Closeable, R](t: T)(f: T => R): R = {
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allCatch.andFinally{t.close} apply { f(t) }
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}
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override def run() {
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withCloseable(new BufferedReader(new InputStreamReader(is))) {
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br => try Stream.continually(br.readLine()).takeWhile(_ != null).foreach(Log.i(tag, _)) catch {
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case ignore: IOException =>
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}
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}
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}
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}
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/**
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* @author ayanamist@gmail.com
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*/
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class GuardedProcess(cmd: Seq[String]) {
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private val TAG = classOf[GuardedProcess].getSimpleName
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@volatile private var guardThread: Thread = _
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@volatile private var isDestroyed: Boolean = _
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@volatile private var process: Process = _
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@volatile private var isRestart = false
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def start(onRestartCallback: () => Unit = null): GuardedProcess = {
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val semaphore = new Semaphore(1)
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semaphore.acquire
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@volatile var ioException: IOException = null
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guardThread = new Thread(() => {
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try {
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var callback: () => Unit = null
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while (!isDestroyed) {
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Log.i(TAG, "start process: " + cmd)
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val startTime = currentTimeMillis
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process = new ProcessBuilder(cmd).redirectErrorStream(true).start
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val is = process.getInputStream
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new StreamLogger(is, TAG).start
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if (callback == null) callback = onRestartCallback else callback()
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semaphore.release
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process.waitFor
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this.synchronized {
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if (isRestart) {
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isRestart = false
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} else {
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if (currentTimeMillis - startTime < 1000) {
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Log.w(TAG, "process exit too fast, stop guard: " + cmd)
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isDestroyed = true
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}
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}
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}
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}
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} catch {
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case ignored: InterruptedException =>
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Log.i(TAG, "thread interrupt, destroy process: " + cmd)
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process.destroy()
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case e: IOException => ioException = e
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} finally semaphore.release
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}, "GuardThread-" + cmd)
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guardThread.start()
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semaphore.acquire
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if (ioException != null) {
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throw ioException
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}
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this
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}
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def destroy() {
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isDestroyed = true
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guardThread.interrupt()
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process.destroy()
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try guardThread.join() catch {
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case ignored: InterruptedException =>
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}
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}
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def restart() {
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this.synchronized {
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isRestart = true
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process.destroy()
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}
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}
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@throws(classOf[InterruptedException])
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def waitFor = {
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guardThread.join()
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0
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}
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}
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