Rewrite LoggerControllerTests

Add JUnit tests with minor code refactor

Issue-ID: VID-384
Change-Id: Ic3bee8e1f6ee58a10053bb0ad2d006912965da1a
Signed-off-by: Joanna Jeremicz <joanna.jeremicz@nokia.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/vid-app-common/src/main/java/org/onap/vid/controller/LogfilePathCreator.java b/vid-app-common/src/main/java/org/onap/vid/controller/LogfilePathCreator.java
new file mode 100644
index 000000000..c317994fe
--- /dev/null
+++ b/vid-app-common/src/main/java/org/onap/vid/controller/LogfilePathCreator.java
@@ -0,0 +1,66 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * VID
+ * ================================================================================
+ * Copyright (C) 2017 - 2019 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.vid.controller;
+
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.core.Appender;
+import ch.qos.logback.core.FileAppender;
+import ch.qos.logback.core.spi.AppenderAttachable;
+import com.att.eelf.configuration.Configuration;
+import java.util.stream.Stream;
+import javax.ws.rs.InternalServerErrorException;
+import org.onap.portalsdk.core.logging.logic.EELFLoggerDelegate;
+import org.onap.vid.utils.Streams;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+@Component
+public final class LogfilePathCreator {
+
+    private static final EELFLoggerDelegate LOGGER = EELFLoggerDelegate.getLogger(LogfilePathCreator.class);
+
+    String getLogfilePath(String loggerName) {
+        /*
+        Find the requested logger, and pull all of it's appenders.
+        Find the first of the appenders that is a FileAppender, and return it's
+        write-out filename.
+         */
+        LOGGER.debug("Searching for logfile path with loggerName: ", loggerName);
+        LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();;
+        return context.getLoggerList().stream()
+            .filter(logger -> logger.getName().equals(Configuration.GENERAL_LOGGER_NAME + "." + loggerName))
+            .flatMap(this::pullSubAppenders)
+            .flatMap(appender -> {
+                // Appender might be "attachable", if so - roll-up its sub-appenders
+                return (appender instanceof AppenderAttachable) ?
+                    pullSubAppenders((AppenderAttachable<?>) appender) : Stream.of(appender);
+            })
+            .filter(appender -> appender instanceof FileAppender)
+            .map(appender -> (FileAppender<?>) appender)
+            .map(FileAppender::getFile)
+            .findFirst()
+            .orElseThrow(() -> new InternalServerErrorException("logfile for " + loggerName + " not found"));
+    }
+
+    private <T> Stream<Appender<T>> pullSubAppenders(AppenderAttachable<T> logger) {
+        return Streams.fromIterator(logger.iteratorForAppenders());
+    }
+}
\ No newline at end of file