Initial commit

node_modules/azure-storage/examples/samples/continuationsample.js

@@ -0,0 +1,159 @@
+// 
+// Copyright (c) Microsoft and contributors.  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.
+// 
+
+/**
+* This sample demonstrates how to handle continuation tokens and virtual "pages" of results when performing a listing
+* operation on the blob service.
+*
+* This sample peformsthe following steps:
+*
+* 0. Create container.
+*
+* 1. Create 50 blobs.
+*
+* 2. List the first 10(page size) blobs.
+*
+* 3. Check whether there are more results.
+*
+* 4. Repeat 2 and 3 until complete.
+*
+*/
+
+var fs = require('fs');
+
+var azure;
+if (fs.existsSync('absolute path to azure-storage.js')) {
+  azure = require('absolute path to azure-storage');
+} else {
+  azure = require('azure-storage');
+}
+
+var container = 'paginationsample';
+var blob = 'contsample';
+var blobs = [];
+
+var blobService = azure.createBlobService()
+      .withFilter(new azure.ExponentialRetryPolicyFilter());
+
+// optionally set a proxy
+/*var proxy = {
+  protocol: 'http:',
+  host: '127.0.0.1',
+  port: 8888
+};
+
+blobService.setProxy(proxy);
+*/
+
+var totalBlobsCount;
+var pageSize;
+
+function continuationSample () {
+  var processArguments = process.argv;
+  if (processArguments.length !== 4) {
+    console.log('Incorrect number of arguments. Should be: numBlobs pageSize [deleteContainer]\nTry: 51 10');
+    process.exit(1);
+  } 
+
+  totalBlobsCount = parseInt(processArguments[2], 10);
+  pageSize = parseInt(processArguments[3], 10);
+
+  console.log('Starting continuationSample.');
+
+  // Create the container
+  createContainer(container, function () {
+
+  console.log('Entering createBlobs.');
+
+    // Upload blobs from text.
+    createBlobs(totalBlobsCount, function () {
+      var options = {
+        maxResults: pageSize,
+        include: 'metadata',
+        locationMode: azure.StorageUtilities.LocationMode.PRIMARY_THEN_SECONDARY
+      };
+
+      console.log('Entering listBlobs.');
+
+      // List blobs using continuation tokens.
+      listBlobs(options, null, function () {
+
+        // Delete the container
+        deleteContainer(container, function () {
+          console.log('Ending continuationSample.');
+        });
+      });
+    });
+  });
+}
+
+function createContainer (container, callback) {
+  // Create the container.
+  blobService.createContainerIfNotExists(container, function (error) {
+    if (error) {
+      console.log(error);
+    } else {
+      console.log('Created the container ' + container);
+      callback();
+    }
+  });
+}
+
+function createBlobs(currentBlobsCount, callback) {
+  // Upload totalBlobsCount blobs to the container.
+  var options = {};
+  options.metadata = {'hello':'world'};
+
+  blobService.createBlockBlobFromText(container, blob + currentBlobsCount, 'blob' + currentBlobsCount, options, function (error) {
+    if (error) {
+      console.log(error);
+    } else if (currentBlobsCount > 1) {
+      createBlobs(--currentBlobsCount, callback);
+    } else {
+      console.log(' Created ' + totalBlobsCount + ' blobs.');
+      callback();
+    }
+  });
+}
+
+function listBlobs (options, token, callback) {
+  blobService.listBlobsSegmented(container, token, options, function(error, result) {
+    blobs.push.apply(blobs, result.entries);
+    var token = result.continuationToken;
+    if(token) {
+      console.log(' Received a page of results. There are ' + result.entries.length + ' blobs on this page.');
+      listBlobs(options, token, callback);
+    }
+    else {
+      console.log(' Completed listing. There are ' + blobs.length + ' blobs');
+      callback();
+    }
+  });
+}
+
+function deleteContainer (container, callback) {
+  // Delete the container.
+  blobService.deleteContainerIfExists(container, function (error) {
+    if (error) {
+      console.log(error);
+    } else {
+      console.log('Deleted the container ' + container);
+      callback();
+    }
+  });
+}
+
+continuationSample();