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ASF GitHub Bot commented on NIFI-1833: -------------------------------------- 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. > Add support for Azure Blob Storage and Table Storage > ---------------------------------------------------- > > Key: NIFI-1833 > URL: https://issues.apache.org/jira/browse/NIFI-1833 > Project: Apache NiFi > Issue Type: Improvement > Components: Extensions > Affects Versions: 0.6.1 > Reporter: Simon Elliston Ball > Priority: Minor > > It would be useful to have an Azure equivalent of the current S3 capability. > Azure also provides a Table storage mechanism, providing simple key value > storage. Since the Azure SDKs are Apache Licensed, this should be reasonably > straightforward. A first cut is available as an addition to the existing > azure bundle. -- This message was sent by Atlassian JIRA (v6.3.15#6346)