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/*
* Tinc App, an Android binding and user interface for the tinc mesh VPN daemon
* Copyright (C) 2017-2018 Pacien TRAN-GIRARD
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.pacien.tincapp.activities.viewlog
import android.arch.lifecycle.LiveData
import org.pacien.tincapp.commands.Executor
import org.pacien.tincapp.commands.Tinc
import java.util.*
import kotlin.concurrent.timer
/**
* @author pacien
*/
class LogLiveData(private val netName: String, private val logLevel: Int, private val logLineSize: Int) : LiveData<List<String>>() {
private val updateInterval = 250L // milliseconds
private val executor = Executor
private val log = LinkedList<String>()
private var loggerProcess: Process? = null
private var logUpdateTimer: Timer? = null
override fun onActive() {
loggerProcess = startNewLogger()
logUpdateTimer = timer(period = updateInterval, action = { outputLog() })
}
override fun onInactive() {
loggerProcess?.destroy()
logUpdateTimer?.apply { cancel() }?.apply { purge() }
}
private fun startNewLogger(): Process {
val newProcess = Tinc.log(netName, logLevel)
executor.runAsyncTask { captureProcessOutput(newProcess) }
return newProcess
}
private fun captureProcessOutput(process: Process) {
process.inputStream?.use { inputStream ->
inputStream.bufferedReader().useLines { lines ->
lines.forEach { appendToLog(it) }
}
}
}
private fun appendToLog(line: String) {
synchronized(log) {
if (log.size >= logLineSize) log.removeFirst()
log.addLast(line)
}
}
private fun outputLog() {
synchronized(log) {
val logView = ArrayList(log)
postValue(logView)
}
}
}
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