Merge PR #1204.

android/app/src/main/assets/logback.xml

@@ -24,8 +24,14 @@
         </encoder>
     </appender>
 
-    <!-- Write TRACE (and higher-level) messages to logcat -->
+    <appender name="buffer" class="com.yubico.authenticator.logging.BufferAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss:SSS} [%thread] %-5level %logger{36} - %X{app} %msg</pattern>
+        </encoder>
+    </appender>
+
     <root level="TRACE">
         <appender-ref ref="logcat" />
+        <appender-ref ref="buffer" />
     </root>
 </configuration>

android/app/src/main/kotlin/com/yubico/authenticator/logging/BufferAppender.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2023 Yubico.
+ *
+ * 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.yubico.authenticator.logging
+
+import ch.qos.logback.classic.encoder.PatternLayoutEncoder
+import ch.qos.logback.classic.spi.ILoggingEvent
+import ch.qos.logback.core.UnsynchronizedAppenderBase
+
+class BufferAppender : UnsynchronizedAppenderBase<ILoggingEvent>() {
+
+    private var encoder: PatternLayoutEncoder? = null
+
+    private val buffer = arrayListOf<String>()
+
+    public override fun append(event: ILoggingEvent) {
+        if (!isStarted) {
+            return
+        }
+
+        if (buffer.size > MAX_BUFFER_SIZE) {
+            buffer.removeAt(0)
+        }
+
+        buffer.add(encoder!!.layout.doLayout(event))
+    }
+
+    fun getEncoder(): PatternLayoutEncoder? = encoder
+
+    fun setEncoder(encoder: PatternLayoutEncoder?) {
+        this.encoder = encoder
+    }
+
+    fun getLogBuffer(): ArrayList<String> {
+        return buffer
+    }
+
+    companion object {
+        private const val MAX_BUFFER_SIZE = 1000
+    }
+}

android/app/src/main/kotlin/com/yubico/authenticator/logging/FlutterLog.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2022 Yubico.
+ * Copyright (C) 2022-2023 Yubico.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,11 +18,18 @@ package com.yubico.authenticator.logging
 
 import io.flutter.plugin.common.BinaryMessenger
 import io.flutter.plugin.common.MethodChannel
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 
 class FlutterLog(messenger: BinaryMessenger) {
     private var channel = MethodChannel(messenger, "android.log.redirect")
 
+    private val bufferAppender =
+        (LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME) as ch.qos.logback.classic.Logger)
+            .getAppender("buffer") as BufferAppender
+
     init {
+
         channel.setMethodCallHandler { call, result ->
 
             when (call.method) {
@@ -53,7 +60,7 @@ class FlutterLog(messenger: BinaryMessenger) {
                     result.success(null)
                 }
                 "getLogs" -> {
-                    result.success(Log.getBuffer())
+                    result.success(bufferAppender.getLogBuffer())
                 }
                 else -> {
                     result.notImplemented()

android/app/src/main/kotlin/com/yubico/authenticator/logging/Log.kt

@@ -24,7 +24,7 @@ import org.slf4j.LoggerFactory
 
 object Log {
 
-    private val logger = LoggerFactory.getLogger("com.yubico.authenticator")
+    private val logger = LoggerFactory.getLogger("com.yubico.authenticator.Log")
 
     enum class LogLevel {
         TRAFFIC,
@@ -34,13 +34,6 @@ object Log {
         ERROR
     }
 
-    private const val MAX_BUFFER_SIZE = 1000
-    private val buffer = arrayListOf<String>()
-
-    fun getBuffer() : List<String> {
-        return buffer
-    }
-
     private var level = if (BuildConfig.DEBUG) {
         LogLevel.DEBUG
     } else {
@@ -56,17 +49,10 @@ object Log {
             return
         }
 
-        if (buffer.size > MAX_BUFFER_SIZE) {
-            buffer.removeAt(0)
-        }
-
         val logMessage = (if (error == null)
-            "[$loggerName] ${level.name}: $message"
+            "$message [$loggerName]"
         else
-            "[$loggerName] ${level.name}: $message (err: $error)"
+            "$message [$loggerName] (err: $error)")
-                ).also {
-                buffer.add(it)
-            }
 
         when (level) {
             LogLevel.TRAFFIC -> logger.trace(logMessage)