Github user aperepel commented on a diff in the pull request: https://github.com/apache/nifi/pull/1636#discussion_r109800464 --- Diff: nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/ListAzureBlobStorage.java --- @@ -0,0 +1,193 @@ +/* + * 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 java.io.IOException; +import java.net.URISyntaxException; +import java.security.InvalidKeyException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.EnumSet; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; +import org.apache.nifi.annotation.behavior.Stateful; +import org.apache.nifi.annotation.behavior.TriggerSerially; +import org.apache.nifi.annotation.behavior.WritesAttribute; +import org.apache.nifi.annotation.behavior.WritesAttributes; +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.components.PropertyDescriptor; +import org.apache.nifi.components.state.Scope; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.processors.azure.AzureConstants; +import org.apache.nifi.processors.azure.storage.utils.BlobInfo; +import org.apache.nifi.processors.azure.storage.utils.BlobInfo.Builder; +import org.apache.nifi.processors.standard.AbstractListProcessor; + +import com.microsoft.azure.storage.CloudStorageAccount; +import com.microsoft.azure.storage.OperationContext; +import com.microsoft.azure.storage.StorageException; +import com.microsoft.azure.storage.StorageUri; +import com.microsoft.azure.storage.blob.BlobListingDetails; +import com.microsoft.azure.storage.blob.BlobProperties; +import com.microsoft.azure.storage.blob.BlobRequestOptions; +import com.microsoft.azure.storage.blob.CloudBlob; +import com.microsoft.azure.storage.blob.CloudBlobClient; +import com.microsoft.azure.storage.blob.CloudBlobContainer; +import com.microsoft.azure.storage.blob.CloudBlockBlob; +import com.microsoft.azure.storage.blob.ListBlobItem; + +@TriggerSerially +@Tags({ "azure", "microsoft", "cloud", "storage", "blob" }) +@SeeAlso({ FetchAzureBlobStorage.class }) +@CapabilityDescription("Lists blobs in an Azure Storage container. Listing details are attached to an empty FlowFile for use with FetchAzureBlobStorage") +@InputRequirement(Requirement.INPUT_FORBIDDEN) +@WritesAttributes({ @WritesAttribute(attribute = "azure.container", description = "The name of the azure container"), + @WritesAttribute(attribute = "azure.blobname", description = "The name of the azure blob"), @WritesAttribute(attribute = "azure.primaryUri", description = "Primary location for blob content"), + @WritesAttribute(attribute = "azure.secondaryUri", description = "Secondary location for blob content"), @WritesAttribute(attribute = "azure.etag", description = "Etag for the Azure blob"), + @WritesAttribute(attribute = "azure.length", description = "Length of the blob"), @WritesAttribute(attribute = "azure.timestamp", description = "The timestamp in Azure for the blob"), + @WritesAttribute(attribute = "mime.type", description = "MimeType of the content"), @WritesAttribute(attribute = "lang", description = "Language code for the content"), + @WritesAttribute(attribute = "azure.blobtype", description = "This is the type of blob and can be either page or block type") }) +@Stateful(scopes = { Scope.LOCAL, Scope.CLUSTER }, description = "After performing a listing of blobs, the timestamp of the newest blob is stored. " + + "This allows the Processor to list only blobs that have been added or modified after " + "this date the next time that the Processor is run.") +public class ListAzureBlobStorage extends AbstractListProcessor<BlobInfo> { + + private static final PropertyDescriptor PREFIX = new PropertyDescriptor.Builder().name("Prefix").description("Search prefix for listing").addValidator(StandardValidators.NON_EMPTY_VALIDATOR) + .expressionLanguageSupported(true).required(false).build(); + + public static final List<PropertyDescriptor> PROPERTIES = Collections.unmodifiableList(Arrays.asList(AzureConstants.ACCOUNT_NAME, AzureConstants.ACCOUNT_KEY, AzureConstants.CONTAINER, PREFIX)); + + @Override + protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return PROPERTIES; + } + + @Override + protected Map<String, String> createAttributes(BlobInfo entity, ProcessContext context) { + final Map<String, String> attributes = new HashMap<>(); + attributes.put("azure.etag", entity.getEtag()); + attributes.put("azure.primaryUri", entity.getPrimaryUri()); + attributes.put("azure.secondaryUri", entity.getSecondaryUri()); + attributes.put("azure.blobname", entity.getName()); + attributes.put("azure.blobtype", entity.getBlobType()); + attributes.put("azure.length", String.valueOf(entity.getLength())); + attributes.put("azure.timestamp", String.valueOf(entity.getTimestamp())); + attributes.put("mime.type", entity.getContentType()); + attributes.put("lang", entity.getContentLanguage()); + + return attributes; + } + + @Override + protected String getPath(final ProcessContext context) { + return context.getProperty(AzureConstants.CONTAINER).evaluateAttributeExpressions().getValue(); + } + + @Override + protected boolean isListingResetNecessary(final PropertyDescriptor property) { + // TODO - implement + return false; + } + + @Override + protected Scope getStateScope(final ProcessContext context) { + return Scope.CLUSTER; + } + + @Override + protected List<BlobInfo> performListing(final ProcessContext context, final Long minTimestamp) throws IOException { + String containerName = context.getProperty(AzureConstants.CONTAINER).evaluateAttributeExpressions().getValue(); + String prefix = context.getProperty(PREFIX).evaluateAttributeExpressions().getValue(); + if (prefix == null) { + prefix = ""; + } + final List<BlobInfo> listing = new ArrayList<>(); + try { + CloudStorageAccount storageAccount = createStorageConnection(context); + CloudBlobClient blobClient = storageAccount.createCloudBlobClient(); + CloudBlobContainer container = blobClient.getContainerReference(containerName); + + BlobRequestOptions blobRequestOptions = null; + OperationContext operationContext = null; + + for (ListBlobItem blob : container.listBlobs(prefix, true, EnumSet.of(BlobListingDetails.METADATA), blobRequestOptions, operationContext)) { + if (blob instanceof CloudBlob) { + CloudBlob cloudBlob = (CloudBlob) blob; + BlobProperties properties = cloudBlob.getProperties(); + StorageUri uri = cloudBlob.getSnapshotQualifiedStorageUri(); + + Builder builder = new BlobInfo.Builder().primaryUri(uri.getPrimaryUri().toString()).secondaryUri(uri.getSecondaryUri().toString()).contentType(properties.getContentType()) + .contentLanguage(properties.getContentLanguage()).etag(properties.getEtag()).lastModifiedTime(properties.getLastModified().getTime()).length(properties.getLength()); + + if (blob instanceof CloudBlockBlob) { + builder.blobType(AzureConstants.BLOCK); + } else { + builder.blobType(AzureConstants.PAGE); + } + listing.add(builder.build()); + } + } + } catch (IllegalArgumentException | URISyntaxException | StorageException e) { + throw (new IOException(e)); + } + return listing; + } + + protected static CloudStorageAccount createStorageConnection(ProcessContext context) { + final String accountName = context.getProperty(AzureConstants.ACCOUNT_NAME).evaluateAttributeExpressions().getValue(); + final String accountKey = context.getProperty(AzureConstants.ACCOUNT_KEY).evaluateAttributeExpressions().getValue(); + final String storageConnectionString = String.format("DefaultEndpointsProtocol=http;AccountName=%s;AccountKey=%s", accountName, accountKey); + try { + return createStorageAccountFromConnectionString(storageConnectionString); + } catch (InvalidKeyException | URISyntaxException e) { + throw new IllegalArgumentException(e); + } + } + + /** + * Validates the connection string and returns the storage account. The connection string must be in the Azure connection string format. + * + * @param storageConnectionString + * Connection string for the storage service or the emulator + * @return The newly created CloudStorageAccount object + * + */ + private static CloudStorageAccount createStorageAccountFromConnectionString(String storageConnectionString) throws IllegalArgumentException, URISyntaxException, InvalidKeyException { + + CloudStorageAccount storageAccount; + try { + storageAccount = CloudStorageAccount.parse(storageConnectionString); + } catch (IllegalArgumentException | URISyntaxException e) { + System.out.println("\nConnection string specifies an invalid URI."); --- End diff -- Reworked to log properly, removed sys.out.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---