Logging: the plugin instantiates the default logger even when a custom one is provided (#3252)

* KTOR-5186 Do not create the default logger if a custom one is provided

Logging: the plugin instantiates the default logger even when a custom one is provided (#3252)
* KTOR-5186 Do not create the default logger if a custom one is provided
75a15395 · Aleksei Tirman · GitHub · 0a663271 · 75a15395
--- a/ktor-client/ktor-client-plugins/ktor-client-logging/common/src/io/ktor/client/plugins/logging/Logging.kt
+++ b/ktor-client/ktor-client-plugins/ktor-client-logging/common/src/io/ktor/client/plugins/logging/Logging.kt
@@ -39,10 +39,16 @@ public class Logging private constructor(
         */
        internal var filters = mutableListOf<(HttpRequestBuilder) -> Boolean>()

+        private var _logger: Logger? = null
+
        /**
         * Specifies a [Logger] instance.
         */
-        public var logger: Logger = Logger.DEFAULT
+        public var logger: Logger
+            get() = _logger ?: Logger.DEFAULT
+            set(value) {
+                _logger = value
+            }

        /**
         * Specifies the log the logging level.