NIFI-4819: Added DeleteAzureBlobStorage that handles deletion of blob from an Azure Storage container

Signed-off-by: Pierre Villard <pierre.villard.fr@gmail.com>

This closes #2436.

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/pom.xml

@@ -80,4 +80,17 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.rat</groupId>
+                <artifactId>apache-rat-plugin</artifactId>
+                <configuration>
+                    <excludes combine.children="append">
+                        <exclude>src/test/resources/hello.txt</exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 </project>

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/DeleteAzureBlobStorage.java

@@ -0,0 +1,72 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage;
+
+import com.microsoft.azure.storage.StorageException;
+import com.microsoft.azure.storage.blob.CloudBlob;
+import com.microsoft.azure.storage.blob.CloudBlobClient;
+import com.microsoft.azure.storage.blob.CloudBlobContainer;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processors.azure.AbstractAzureBlobProcessor;
+import org.apache.nifi.processors.azure.storage.utils.AzureStorageUtils;
+
+import java.net.URISyntaxException;
+import java.util.concurrent.TimeUnit;
+
+
+@Tags({ "azure", "microsoft", "cloud", "storage", "blob" })
+@SeeAlso({ ListAzureBlobStorage.class, FetchAzureBlobStorage.class, PutAzureBlobStorage.class})
+@CapabilityDescription("Deletes the provided blob from Azure Storage")
+@InputRequirement(Requirement.INPUT_REQUIRED)
+public class DeleteAzureBlobStorage extends AbstractAzureBlobProcessor {
+
+    @Override
+    public void onTrigger(ProcessContext context, ProcessSession session) throws ProcessException {
+        FlowFile flowFile = session.get();
+
+        if(flowFile == null) {
+            return;
+        }
+
+        final long startNanos = System.nanoTime();
+        String containerName = context.getProperty(AzureStorageUtils.CONTAINER).evaluateAttributeExpressions(flowFile).getValue();
+        String blobPath = context.getProperty(BLOB).evaluateAttributeExpressions(flowFile).getValue();
+
+        try {
+            CloudBlobClient blobClient = AzureStorageUtils.createCloudBlobClient(context, getLogger(), flowFile);
+            CloudBlobContainer container = blobClient.getContainerReference(containerName);
+            CloudBlob blob = container.getBlockBlobReference(blobPath);
+            blob.deleteIfExists();
+            session.transfer(flowFile, REL_SUCCESS);
+
+            final long transferMillis = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNanos);
+            session.getProvenanceReporter().send(flowFile, blob.getSnapshotQualifiedUri().toString(), transferMillis);
+        }catch ( StorageException | URISyntaxException e) {
+            getLogger().error("Failed to delete the specified blob {} from Azure Storage. Routing to failure", new Object[]{blobPath}, e);
+            flowFile = session.penalize(flowFile);
+            session.transfer(flowFile, REL_FAILURE);
+        }
+    }
+}

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/FetchAzureBlobStorage.java

@@ -45,7 +45,7 @@ import com.microsoft.azure.storage.blob.CloudBlobContainer;
 
 @Tags({ "azure", "microsoft", "cloud", "storage", "blob" })
 @CapabilityDescription("Retrieves contents of an Azure Storage Blob, writing the contents to the content of the FlowFile")
-@SeeAlso({ ListAzureBlobStorage.class, PutAzureBlobStorage.class })
+@SeeAlso({ ListAzureBlobStorage.class, PutAzureBlobStorage.class, DeleteAzureBlobStorage.class })
 @InputRequirement(Requirement.INPUT_REQUIRED)
 @WritesAttributes({
     @WritesAttribute(attribute = "azure.length", description = "The length of the blob fetched")

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/ListAzureBlobStorage.java

@@ -57,7 +57,7 @@ import java.util.Map;
 
 @TriggerSerially
 @Tags({ "azure", "microsoft", "cloud", "storage", "blob" })
-@SeeAlso({ FetchAzureBlobStorage.class, PutAzureBlobStorage.class })
+@SeeAlso({ FetchAzureBlobStorage.class, PutAzureBlobStorage.class, DeleteAzureBlobStorage.class })
 @CapabilityDescription("Lists blobs in an Azure Storage container. Listing details are attached to an empty FlowFile for use with FetchAzureBlobStorage.  " +
         "This Processor is designed to run on Primary Node only in a cluster. If the primary node changes, the new Primary Node will pick up where the " +
         "previous node left off without duplicating all of the data.")

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/PutAzureBlobStorage.java

@@ -47,7 +47,7 @@ import com.microsoft.azure.storage.blob.CloudBlobClient;
 import com.microsoft.azure.storage.blob.CloudBlobContainer;
 
 @Tags({ "azure", "microsoft", "cloud", "storage", "blob" })
-@SeeAlso({ ListAzureBlobStorage.class, FetchAzureBlobStorage.class })
+@SeeAlso({ ListAzureBlobStorage.class, FetchAzureBlobStorage.class, DeleteAzureBlobStorage.class })
 @CapabilityDescription("Puts content into an Azure Storage Blob")
 @InputRequirement(Requirement.INPUT_REQUIRED)
 @WritesAttributes({ @WritesAttribute(attribute = "azure.container", description = "The name of the Azure container"),

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/resources/META-INF/services/org.apache.nifi.processor.Processor

@@ -18,3 +18,4 @@ org.apache.nifi.processors.azure.eventhub.ConsumeAzureEventHub
 org.apache.nifi.processors.azure.storage.FetchAzureBlobStorage
 org.apache.nifi.processors.azure.storage.ListAzureBlobStorage
 org.apache.nifi.processors.azure.storage.PutAzureBlobStorage
+org.apache.nifi.processors.azure.storage.DeleteAzureBlobStorage

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/test/java/org/apache/nifi/processors/azure/AbstractAzureBlobStorageIT.java

@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure;
+
+import com.microsoft.azure.storage.StorageException;
+import com.microsoft.azure.storage.blob.CloudBlob;
+import com.microsoft.azure.storage.blob.CloudBlobContainer;
+import org.apache.nifi.processors.azure.storage.AzureTestUtil;
+import org.junit.Assert;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.security.InvalidKeyException;
+
+public class AbstractAzureBlobStorageIT {
+
+    protected final static String SAMPLE_FILE_NAME = "/hello.txt";
+    protected final static String SAMPLE_BLOB_NAME = "testing";
+
+    protected void uploadBlob(String containerName, String filePath) throws URISyntaxException, StorageException, InvalidKeyException, IOException {
+        CloudBlobContainer container = AzureTestUtil.getContainer(containerName);
+        CloudBlob blob = container.getBlockBlobReference(SAMPLE_BLOB_NAME);
+        blob.uploadFromFile(filePath);
+    }
+
+    protected String getFileFromResource(String fileName) {
+        URI uri = null;
+        try {
+            uri = this.getClass().getResource(fileName).toURI();
+        } catch (URISyntaxException e) {
+            Assert.fail("Cannot proceed without File : " + fileName);
+        }
+
+        return uri.toString();
+    }
+
+}
+

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/test/java/org/apache/nifi/processors/azure/storage/AzureTestUtil.java

@@ -33,7 +33,7 @@ import com.microsoft.azure.storage.StorageException;
 import com.microsoft.azure.storage.blob.CloudBlobClient;
 import com.microsoft.azure.storage.blob.CloudBlobContainer;
 
-class AzureTestUtil {
+public class AzureTestUtil {
     private static final String CREDENTIALS_FILE = System.getProperty("user.home") + "/azure-credentials.PROPERTIES";
     static final String TEST_CONTAINER_NAME_PREFIX = "nifitest";
 
@@ -58,15 +58,15 @@ class AzureTestUtil {
 
     }
 
-    static String getAccountName() {
+    public static String getAccountName() {
         return CONFIG.getProperty("accountName");
     }
 
-    static String getAccountKey() {
+    public static String getAccountKey() {
         return CONFIG.getProperty("accountKey");
     }
 
-    static CloudBlobContainer getContainer(String containerName) throws InvalidKeyException, URISyntaxException, StorageException {
+    public static CloudBlobContainer getContainer(String containerName) throws InvalidKeyException, URISyntaxException, StorageException {
         String storageConnectionString = String.format(AzureStorageUtils.FORMAT_BLOB_CONNECTION_STRING, getAccountName(), getAccountKey());
         CloudStorageAccount storageAccount = CloudStorageAccount.parse(storageConnectionString);
         CloudBlobClient blobClient = storageAccount.createCloudBlobClient();

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/test/java/org/apache/nifi/processors/azure/storage/ITDeleteAzureBlobStorage.java

@@ -0,0 +1,62 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage;
+
+import com.microsoft.azure.storage.StorageException;
+import com.microsoft.azure.storage.blob.CloudBlobContainer;
+import org.apache.nifi.processors.azure.AbstractAzureBlobStorageIT;
+import org.apache.nifi.processors.azure.storage.utils.AzureStorageUtils;
+import org.apache.nifi.util.TestRunner;
+import org.apache.nifi.util.TestRunners;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.security.InvalidKeyException;
+import java.util.UUID;
+
+public class ITDeleteAzureBlobStorage extends AbstractAzureBlobStorageIT{
+
+    @Test
+    public void testDeleteBlob() throws StorageException, URISyntaxException, InvalidKeyException, IOException {
+        String containerName = String.format("%s-%s", AzureTestUtil.TEST_CONTAINER_NAME_PREFIX, UUID.randomUUID());
+        CloudBlobContainer container = AzureTestUtil.getContainer(containerName);
+        container.createIfNotExists();
+
+        uploadBlob(containerName, getFileFromResource(SAMPLE_FILE_NAME));
+
+        final TestRunner runner = TestRunners.newTestRunner(DeleteAzureBlobStorage.class);
+
+        try {
+            runner.setValidateExpressionUsage(true);
+
+            runner.setProperty(AzureStorageUtils.ACCOUNT_NAME, AzureTestUtil.getAccountName());
+            runner.setProperty(AzureStorageUtils.ACCOUNT_KEY, AzureTestUtil.getAccountKey());
+            runner.setProperty(AzureStorageUtils.CONTAINER, containerName);
+            runner.setProperty(DeleteAzureBlobStorage.BLOB, AzureTestUtil.TEST_BLOB_NAME);
+
+            runner.enqueue(new byte[0]);
+            runner.run(1);
+
+            runner.assertAllFlowFilesTransferred(DeleteAzureBlobStorage.REL_SUCCESS);
+
+        } finally {
+            container.deleteIfExists();
+        }
+    }
+
+}

nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/test/resources/hello.txt

@@ -0,0 +1 @@
+Hello, World!!