1 files changed, 74 insertions, 0 deletions

diff --git a/app/src/main/java/org/pacien/tincapp/activities/viewlog/LogLiveData.kt b/app/src/main/java/org/pacien/tincapp/activities/viewlog/LogLiveData.kt
new file mode 100644
index 0000000..f410a8c
--- /dev/null
+++ b/app/src/main/java/org/pacien/tincapp/activities/viewlog/LogLiveData.kt
@@ -0,0 +1,74 @@
+/*
+ * 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)
+    }
+  }
+}