Make FileSystemReceptionHandler more tolerant

Make FileSystemReceptionHandler tolerant of exceptions thrown when
parsing tosca template and be able to handle new incoming csar.

Also added the unit test for FileSystemReceptionHandler.

Change-Id: I0f1647f6f952576a8e61adca4d027990706d1411
Issue-ID: POLICY-837
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>

6 files changed, 280 insertions, 11 deletions

diff --git a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java
index 9ac21550..b1a95fac 100644
--- a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java
+++ b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java
@@ -23,6 +23,7 @@ package org.onap.policy.distribution.reception.handling.sdc;
 import static java.nio.file.StandardWatchEventKinds.ENTRY_CREATE;
 
 import java.io.File;
+import java.io.IOException;
 import java.nio.file.FileSystems;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -52,9 +53,10 @@ public class FileSystemReceptionHandler extends AbstractReceptionHandler {
             final FileSystemReceptionHandlerConfigurationParameterGroup handlerParameters =
                                     ParameterService.get(parameterGroupName);
             main(handlerParameters.getWatchPath());
-        } catch (final PolicyDecodingException ex) {
-            LOGGER.debug(ex);
+        } catch (final Exception ex) {
+            LOGGER.error(ex);
         }
+        LOGGER.debug("FileSystemReceptionHandler main loop exited...");
     }
 
     @Override
@@ -67,10 +69,9 @@ public class FileSystemReceptionHandler extends AbstractReceptionHandler {
      * Main entry point.
      * 
      * @param watchPath Path to watch
-     * @throws PolicyDecodingException Decoding exception
      */
     @SuppressWarnings("unchecked")
-    public void main(String watchPath) throws PolicyDecodingException {
+    public void main(String watchPath) {
         try (final WatchService watcher = FileSystems.getDefault().newWatchService()) {
             final Path dir = Paths.get(watchPath);
 
@@ -85,25 +86,31 @@ public class FileSystemReceptionHandler extends AbstractReceptionHandler {
                     Thread.currentThread().interrupt();
                     return;
                 }
+
                 for (final WatchEvent<?> event : key.pollEvents()) {
                     final WatchEvent.Kind<?> kind = event.kind();
                     final WatchEvent<Path> ev = (WatchEvent<Path>) event;
                     final Path fileName = ev.context();
-                    LOGGER.debug("new CSAR found: " + kind.name() + ": " + fileName);
-                    createPolicyInputAndCallHandler(dir.toString() + File.separator + fileName.toString());
-                    LOGGER.debug("CSAR complete: " + kind.name() + ": " + fileName);
+                    try {
+                        LOGGER.debug("new CSAR found: " + kind.name() + ": " + fileName);
+                        createPolicyInputAndCallHandler(dir.toString() + File.separator + fileName.toString());
+                        LOGGER.debug("CSAR complete: " + kind.name() + ": " + fileName);
+                    } catch (final PolicyDecodingException ex) {
+                        LOGGER.error(ex);
+                    }
                 }
                 final boolean valid = key.reset();
                 if (!valid) {
+                    LOGGER.error("Watch key no longer valid!");
                     break;
                 }
             }
-        } catch (final Exception ex) {
+        } catch (final IOException ex) {
             LOGGER.error(ex);
         }
     }
 
-    private void createPolicyInputAndCallHandler(final String fileName) throws PolicyDecodingException {
+    protected void createPolicyInputAndCallHandler(final String fileName) throws PolicyDecodingException {
         final Csar csarObject = new Csar(fileName);
         inputReceived(csarObject);
     }
diff --git a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterGroup.java b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterGroup.java
index 98f3c6a4..457cd5ea 100644
--- a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterGroup.java
+++ b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterGroup.java
@@ -68,8 +68,14 @@ public class FileSystemReceptionHandlerConfigurationParameterGroup extends Recep
      */
     private void validatePathElement(final GroupValidationResult validationResult, final String element,
             final String elementName) {
-        File file = new File(element);
-        if (!(file.exists() && file.isDirectory())) {
+        boolean valid = false;
+        if (element != null) {
+            File file = new File(element);
+            if (file.exists() && file.isDirectory()) {
+                valid = true;
+            }
+        }
+        if (!valid) {
             validationResult.setResult(elementName, ValidationStatus.INVALID,
                     elementName + " must be a valid directory");
         }
diff --git a/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandler.java b/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandler.java
new file mode 100644
index 00000000..8edca74e
--- /dev/null
+++ b/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandler.java
@@ -0,0 +1,145 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2018 Intel. 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.distribution.reception.handling.sdc;
+
+import static org.junit.Assert.fail;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.onap.policy.common.logging.flexlogger.FlexLogger;
+import org.onap.policy.common.logging.flexlogger.Logger;
+import org.onap.policy.common.parameters.ParameterService;
+import org.onap.policy.distribution.forwarding.PolicyForwarder;
+import org.onap.policy.distribution.reception.decoding.PolicyDecodingException;
+import org.onap.policy.distribution.reception.statistics.DistributionStatisticsManager;
+
+/**
+ * Class to perform unit test of {@link FileSystemReceptionHandler}.
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class TestFileSystemReceptionHandler {
+
+    private static final Logger LOGGER = FlexLogger.getLogger(TestFileSystemReceptionHandler.class);
+    private static final String DUMMY_SERVICE_CSAR = "dummyService.csar";
+
+    @Rule
+    public TemporaryFolder tempFolder = new TemporaryFolder();
+
+    private FileSystemReceptionHandlerConfigurationParameterGroup pssdConfigParameters;
+    private FileSystemReceptionHandler fileSystemHandler;
+
+
+    /**
+     * Setup for the test cases.
+     *
+     * @throws IOException if it occurs
+     * @throws SecurityException if it occurs
+     * @throws NoSuchFieldException if it occurs
+     * @throws IllegalAccessException if it occurs
+     * @throws IllegalArgumentException if it occurs
+     */
+    @Before
+    public final void init() throws IOException, NoSuchFieldException, SecurityException, IllegalArgumentException,
+            IllegalAccessException {
+        DistributionStatisticsManager.resetAllStatistics();
+
+        final Gson gson = new GsonBuilder().create();
+        String json = "{ \"name\": \"parameterConfig9\", \"watchPath\": \"";
+        json += tempFolder.getRoot().getAbsolutePath() + "\"}";
+        pssdConfigParameters = gson.fromJson(json,
+                FileSystemReceptionHandlerConfigurationParameterGroup.class);
+        ParameterService.register(pssdConfigParameters);
+        fileSystemHandler = new FileSystemReceptionHandler();
+    }
+
+    @After
+    public void teardown() {
+        ParameterService.deregister(pssdConfigParameters);
+    }
+    
+    @Test
+    public final void testInit() {
+        final FileSystemReceptionHandler sypHandler = Mockito.spy(fileSystemHandler);
+        Mockito.doNothing().when(sypHandler).main(Mockito.isA(String.class));
+        sypHandler.initializeReception(pssdConfigParameters.getName());
+        Mockito.verify(sypHandler, Mockito.times(1)).main(Mockito.isA(String.class));
+    }
+
+    @Test
+    public final void testDestroy() {
+        try {
+            final FileSystemReceptionHandler sypHandler = Mockito.spy(fileSystemHandler);
+            Mockito.doNothing().when(sypHandler).main(Mockito.isA(String.class));
+            sypHandler.initializeReception(pssdConfigParameters.getName());
+            sypHandler.destroy();
+        } catch (final Exception exp) {
+            LOGGER.error(exp);
+            fail("Test should not throw any exception");
+        }
+
+    }
+
+    @Test
+    public void testMain() throws IOException, PolicyDecodingException {
+
+        final FileSystemReceptionHandler sypHandler = Mockito.spy(fileSystemHandler);
+        Mockito.doNothing().when(sypHandler).createPolicyInputAndCallHandler(Mockito.isA(String.class));
+
+        final String watchPath = tempFolder.getRoot().getAbsolutePath().toString();
+        Thread th = new Thread(() -> {
+            sypHandler.main(watchPath);
+        });
+
+        th.start();
+        try {
+            // yield to main thread
+            Thread.sleep(1000);
+            Files.copy(Paths.get("src/test/resources/hpaPolicyHugePage.csar"),
+                Paths.get(watchPath + File.separator + "hpaPolicyHugePage.csar"));
+            // wait enough time 
+            Thread.sleep(1000);
+            sypHandler.destroy();
+            th.interrupt();
+            th.join();
+        } catch (final InterruptedException ex) {
+            LOGGER.error(ex);
+        }
+        Mockito.verify(sypHandler, Mockito.times(1))
+            .createPolicyInputAndCallHandler(Mockito.isA(String.class));
+
+    }
+}
+
diff --git a/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandlerConfigurationParameterGroup.java b/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandlerConfigurationParameterGroup.java
new file mode 100644
index 00000000..b4b905c5
--- /dev/null
+++ b/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandlerConfigurationParameterGroup.java
@@ -0,0 +1,102 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2018 Intel. 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.distribution.reception.handling.sdc;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Arrays;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import org.onap.policy.common.parameters.GroupValidationResult;
+
+/**
+ * Class to perform unit test of {@link FileSystemReceptionHandlerConfigurationParameterGroup}.
+ *
+ */
+public class TestFileSystemReceptionHandlerConfigurationParameterGroup {
+    @Rule
+    public TemporaryFolder tempFolder = new TemporaryFolder();
+
+    @Test
+    public void testFileSystemConfiguration() throws IOException {
+        FileSystemReceptionHandlerConfigurationParameterGroup configParameters = null;
+        try {
+            final Gson gson = new GsonBuilder().create();
+            configParameters = gson.fromJson(new FileReader("src/test/resources/handling-filesystem.json"),
+                    FileSystemReceptionHandlerConfigurationParameterGroup.class);
+        } catch (final Exception e) {
+            fail("test should not thrown an exception here: " + e.getMessage());
+        }
+        final GroupValidationResult validationResult = configParameters.validate();
+        assertTrue(validationResult.isValid());
+        assertEquals("/tmp", configParameters.getWatchPath());
+    }
+
+    @Test
+    public void testInvalidFileSystemConfiguration() throws IOException {
+        FileSystemReceptionHandlerConfigurationParameterGroup configParameters = null;
+        try {
+            final Gson gson = new GsonBuilder().create();
+            configParameters = gson.fromJson(new FileReader("src/test/resources/handling-sdcInvalid.json"),
+                    FileSystemReceptionHandlerConfigurationParameterGroup.class);
+        } catch (final Exception e) {
+            fail("test should not thrown an exception here: " + e.getMessage());
+        }
+        final GroupValidationResult validationResult = configParameters.validate();
+        assertFalse(validationResult.isValid());
+    }
+
+    @Test
+    public void testFileSystemReceptionHandlerConfigurationParameterBuilder() {
+
+        final FileSystemReceptionHandlerConfigurationParameterBuilder builder =
+                new FileSystemReceptionHandlerConfigurationParameterBuilder().setWatchPath("/foo/bar");
+        final FileSystemReceptionHandlerConfigurationParameterGroup configParameters =
+                new FileSystemReceptionHandlerConfigurationParameterGroup(builder);
+
+        assertEquals("/foo/bar", configParameters.getWatchPath());
+    }
+
+    @Test
+    public void testFileSystemReceptionHandlerConfigurationParameterBuilderWithInvalidPath() throws IOException {
+        final String invalidPath = tempFolder.newFile("foobar").getAbsolutePath();
+
+        final FileSystemReceptionHandlerConfigurationParameterBuilder builder =
+                new FileSystemReceptionHandlerConfigurationParameterBuilder().setWatchPath(invalidPath);
+        final FileSystemReceptionHandlerConfigurationParameterGroup configParameters =
+                new FileSystemReceptionHandlerConfigurationParameterGroup(builder);
+
+        final GroupValidationResult validateResult = configParameters.validate();
+        assertFalse(validateResult.isValid());
+        assertTrue(validateResult.getResult().contains("must be a valid directory"));
+    }
+}
diff --git a/plugins/reception-plugins/src/test/resources/handling-filesystem.json b/plugins/reception-plugins/src/test/resources/handling-filesystem.json
new file mode 100644
index 00000000..6a402a7a
--- /dev/null
+++ b/plugins/reception-plugins/src/test/resources/handling-filesystem.json
@@ -0,0 +1,5 @@
+{
+    "name": "parameterConfig1",
+    "watchPath": "/tmp"
+}
+
diff --git a/plugins/reception-plugins/src/test/resources/handling-filesystemInvalid.json b/plugins/reception-plugins/src/test/resources/handling-filesystemInvalid.json
new file mode 100644
index 00000000..871b61c2
--- /dev/null
+++ b/plugins/reception-plugins/src/test/resources/handling-filesystemInvalid.json
@@ -0,0 +1,4 @@
+{
+   "invalidKey": "/tmp"
+}
+