Make sure that base folder exists

src/commonMain/kotlin/com/airthings/lib/logging/facility/FileLoggerFacility.kt

@@ -133,11 +133,7 @@ class FileLoggerFacility(
 
     init {
         coroutineScope.launch {
-            // Please note: The call to `io.mkdirs()` returns true if the directory exists, which may be
-            // different from the platform's implementation.
-            if (!io.mkdirs(baseFolder)) {
-                throw IllegalArgumentException("Base log folder is invalid: $baseFolder")
-            }
+            ensureBaseFolder()
         }
     }
 
@@ -200,7 +196,10 @@ class FileLoggerFacility(
      *
      * Note: The returned list contains absolute (canonical) paths to the files.
      */
-    suspend fun files(): Collection<String> = io.of(baseFolder)
+    suspend fun files(): Collection<String> {
+        ensureBaseFolder()
+        return io.of(baseFolder)
+    }
 
     /**
      * Scans the [baseFolder] and returns the list of log files residing in it that
@@ -210,14 +209,18 @@ class FileLoggerFacility(
      *
      * @param date The date from which log files should be considered.
      */
-    suspend fun files(date: LogDate): Collection<String> = io.of(baseFolder, date)
+    suspend fun files(date: LogDate): Collection<String> {
+        ensureBaseFolder()
+        return io.of(baseFolder, date)
+    }
 
     /**
      * Deletes a file residing in [baseFolder].
      *
      * @param name The file name to delete.
      */
     suspend fun delete(name: String) {
+        ensureBaseFolder()
         io.delete("$baseFolder${io.pathSeparator}$name")
     }
 
@@ -230,6 +233,14 @@ class FileLoggerFacility(
         io.delete(path)
     }
 
+    private suspend fun ensureBaseFolder() {
+        // Please note: The call to `io.mkdirs()` returns true if the directory exists, which may be
+        // different from the platform's implementation.
+        if (!io.mkdirs(baseFolder)) {
+            throw IllegalArgumentException("Base log folder is invalid: $baseFolder")
+        }
+    }
+
     private fun withLogLevel(
         level: LogLevel,
         action: suspend (String) -> Unit,
@@ -239,6 +250,8 @@ class FileLoggerFacility(
         }
 
         coroutineScope.launch {
+            ensureBaseFolder()
+
             val logFile = "$baseFolder${io.pathSeparator}${dateStamp(null)}.log"
             val currentLogFileLocked = currentLogFile.value
 

src/commonMain/kotlin/com/airthings/lib/logging/facility/JsonLoggerFacility.kt

@@ -133,11 +133,7 @@ class JsonLoggerFacility(
 
     init {
         coroutineScope.launch {
-            // Please note: The call to `io.mkdirs()` returns true if the directory exists, which may be
-            // different from the platform's implementation.
-            if (!io.mkdirs(baseFolder)) {
-                throw IllegalArgumentException("Base log folder is invalid: $baseFolder")
-            }
+            ensureBaseFolder()
         }
     }
 
@@ -221,14 +217,28 @@ class JsonLoggerFacility(
     /**
      * Scans the [baseFolder] and returns the list of log files residing in it.
      */
-    suspend fun files(): Collection<String> = io.of(baseFolder)
+    suspend fun files(): Collection<String> {
+        ensureBaseFolder()
+        return io.of(baseFolder)
+    }
 
     /**
      * Scans the [baseFolder] and returns the list of log files residing in it that were created after a certain date.
      *
      * @param date The date from which log files should be considered.
      */
-    suspend fun files(date: LogDate): Collection<String> = io.of(baseFolder, date)
+    suspend fun files(date: LogDate): Collection<String> {
+        ensureBaseFolder()
+        return io.of(baseFolder, date)
+    }
+
+    private suspend fun ensureBaseFolder() {
+        // Please note: The call to `io.mkdirs()` returns true if the directory exists, which may be
+        // different from the platform's implementation.
+        if (!io.mkdirs(baseFolder)) {
+            throw IllegalArgumentException("Base log folder is invalid: $baseFolder")
+        }
+    }
 
     private fun withLogLevel(
         level: LogLevel,
@@ -239,6 +249,8 @@ class JsonLoggerFacility(
         }
 
         coroutineScope.launch {
+            ensureBaseFolder()
+
             val logFile = "$baseFolder${io.pathSeparator}${dateStamp(null)}.json"
             val currentLogFileLocked = currentLogFile.value
 

src/jvmMain/kotlin/com/airthings/lib/logging/platform/PlatformFileInputOutputImpl.kt

@@ -63,8 +63,12 @@ internal actual class PlatformFileInputOutputImpl : PlatformFileInputOutput {
     }
 
     override suspend fun ensure(path: String) {
-        synchronized(writeLock) {
-            File(path).createNewFile()
+        val parentPath = File(path).parentFile.canonicalPath
+
+        if (mkdirs(parentPath)) {
+            synchronized(writeLock) {
+                File(path).createNewFile()
+            }
         }
     }