feat: merge app and ldk logs into unified file

- Both APP and LDK loggers now write to same file (bitkit_<timestamp>.log)
- Logs are automatically in chronological order due to shared file
- File writes serialized via single-threaded coroutine queue
- APP/LDK tag prefixes distinguish log sources

Co-authored-by: Ovi Trif <[email protected]>

Author: github-actions[bot]

app/src/main/java/to/bitkit/utils/Logger.kt

@@ -37,6 +37,15 @@ val Logger = AppLogger()
 class AppLogger(private val source: LogSource = LogSource.Bitkit) {
     companion object {
         private const val TAG = "Logger"
+        private var sharedSaver: LogSaver? = null
+
+        fun getOrCreateSharedSaver(): LogSaver {
+            if (sharedSaver == null) {
+                val sessionPath = runCatching { buildSessionLogFilePath() }.getOrElse { "" }
+                sharedSaver = LogSaverImpl(sessionPath)
+            }
+            return sharedSaver!!
+        }
     }
 
     private var delegate: LoggerImpl? = null
@@ -46,13 +55,13 @@ class AppLogger(private val source: LogSource = LogSource.Bitkit) {
     }
 
     private fun createDelegate(): LoggerImpl {
-        val sessionPath = runCatching { buildSessionLogFilePath(source) }.getOrElse { "" }
-        return LoggerImpl(APP, LogSaverImpl(source, sessionPath))
+        return LoggerImpl(APP, getOrCreateSharedSaver())
     }
 
     fun reset() {
         warn("Wiping entire logs directory…", context = TAG)
         runCatching { Env.logDir.deleteRecursively() }
+        sharedSaver = null
         delegate = runCatching { createDelegate() }.getOrNull()
     }
 
@@ -198,7 +207,6 @@ interface LogSaver {
 }
 
 class LogSaverImpl(
-    source: LogSource,
     private val sessionFilePath: String,
 ) : LogSaver {
     private val queue: CoroutineScope by lazy {
@@ -207,7 +215,7 @@ class LogSaverImpl(
 
     init {
         if (sessionFilePath.isNotEmpty()) {
-            log("Log session for '${source.name}' initialized with file path: '$sessionFilePath'")
+            log("Unified log session initialized with file path: '$sessionFilePath'")
 
             // Clean all old log files in background
             CoroutineScope(Dispatchers.IO).launch {
@@ -273,8 +281,7 @@ class LogSaverImpl(
 
 class LdkLogWriter(
     private val maxLogLevel: LdkLogLevel = Env.ldkLogLevel,
-    private val source: LogSource = LogSource.Ldk,
-    saver: LogSaver = LogSaverImpl(source, buildSessionLogFilePath(source)),
+    saver: LogSaver = AppLogger.getOrCreateSharedSaver(),
 ) : LogWriter {
     private val delegate: LoggerImpl = LoggerImpl(LDK, saver)
 
@@ -296,11 +303,10 @@ class LdkLogWriter(
     }
 }
 
-private fun buildSessionLogFilePath(source: LogSource): String {
+private fun buildSessionLogFilePath(): String {
     val logDir = Env.logDir
-    val sourceName = source.name.lowercase()
     val timestamp = utcDateFormatterOf(DatePattern.LOG_FILE).format(Date())
-    val path = logDir.resolve("${sourceName}_$timestamp.log").path
+    val path = logDir.resolve("bitkit_$timestamp.log").path
     return path
 }