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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.permissioncontroller
import android.util.Log
import com.android.permissioncontroller.Constants.LOGS_TO_DUMP_FILE
import java.io.File
/** Like {@link Log} but stores the logs in a file which can later be dumped via {@link #dump} */
object DumpableLog {
private const val MAX_FILE_SIZE = 64 * 1024
private val lock = Any()
private val file = File(PermissionControllerApplication.get().filesDir, LOGS_TO_DUMP_FILE)
init {
file.createNewFile()
}
/** Equivalent to {@link Log.v} */
fun v(tag: String, message: String, exception: Throwable? = null) {
Log.v(tag, message, exception)
addLogToDump("v", tag, message, exception)
}
/** Equivalent to {@link Log.d} */
fun d(tag: String, message: String, exception: Throwable? = null) {
Log.d(tag, message, exception)
addLogToDump("d", tag, message, exception)
}
/** Equivalent to {@link Log.i} */
fun i(tag: String, message: String, exception: Throwable? = null) {
Log.i(tag, message, exception)
addLogToDump("i", tag, message, exception)
}
/** Equivalent to {@link Log.w} */
fun w(tag: String, message: String, exception: Throwable? = null) {
Log.w(tag, message, exception)
addLogToDump("w", tag, message, exception)
}
/** Equivalent to {@link Log.e} */
fun e(tag: String, message: String, exception: Throwable? = null) {
Log.e(tag, message, exception)
addLogToDump("e", tag, message, exception)
}
private fun addLogToDump(level: String, tag: String, message: String, exception: Throwable?) {
synchronized(lock) {
// TODO: Needs to be replaced by proper log rotation
if (file.length() > MAX_FILE_SIZE) {
val dump = file.readLines()
file.writeText("truncated at ${System.currentTimeMillis()}\n")
dump.subList(dump.size / 2, dump.size).forEach { file.appendText(it + "\n") }
}
file.appendText(
"${System.currentTimeMillis()} $tag:$level $message " +
"${exception?.let { it.message + Log.getStackTraceString(it) } ?: ""}\n"
)
}
}
/** @return the previously logged entries */
suspend fun get(): List<String> {
synchronized(lock) {
return file.readLines()
}
}
}
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