azure-storage-legacy

Microsoft Azure SDK for Node.js - Legacy Storage

This project provides a Node.js package that lets you consume Azure storage services. This package exists to provide back compatibility with previous versions of the azure sdk for node.

• API version: 2013-03-01

Features

• Blob client
• Table Store client
• Queue client

How to Install

npm install azure-storage-legacy

How to Use

Usage

Table Storage

To ensure a table exists, call createTableIfNotExists:

var tableService = storage.createTableService();
tableService.createTableIfNotExists('tasktable', function(error){
    if(!error){
        // Table exists
    }
});

A new entity can be added by calling insertEntity:

var tableService = storage.createTableService(),
    task1 = {
        PartitionKey : 'tasksSeattle',
        RowKey: '1',
        Description: 'Take out the trash',
        DueDate: new Date(2011, 12, 14, 12)
    };
tableService.insertEntity('tasktable', task1, function(error){
    if(!error){
        // Entity inserted
    }
});

The method queryEntity can then be used to fetch the entity that was just inserted:

var tableService = storage.createTableService();
tableService.queryEntity('tasktable', 'tasksSeattle', '1', function(error, serverEntity){
    if(!error){
        // Entity available in serverEntity variable
    }
});

Blob Storage

The createContainerIfNotExists method can be used to create a container in which to store a blob:

var blobService = storage.createBlobService();
blobService.createContainerIfNotExists('taskcontainer', {publicAccessLevel : 'blob'}, function(error){
    if(!error){
        // Container exists and is public
    }
});

To upload a file (assuming it is called task1-upload.txt and it is placed in the same folder as the script below), the method createBlob can be used. This method will return a writable stream which can be writen to, for instance, through piping:

var blobService = storage.createBlobService();

fs.createReadStream('task1-upload.txt').pipe(blobService.createBlob('taskcontainer', 'task1', storage.Constants.BlobConstants.BlobTypes.BLOCK));

To download the blob and write it to the file system, a similar getBlob method can be used:

var blobService = storage.createBlobService();

blobService.getBlob('taskcontainer', 'task1').pipe(fs.createWriteStream('task1-download.txt'));

To create a SAS URL you can use the getBlobUrl method. Additionally you can use the date helper functions to easily create a SAS that expires at some point relative to the current time.

var blobService = storage.createBlobService();

//create a SAS that expires in an hour
var sharedAccessPolicy = {
    AccessPolicy: {
        Expiry: storage.date.minutesFromNow(60);
    }
};

var sasUrl = blobService.getBlobUrl(containerName, blobName, sharedAccessPolicy);

Storage Queues

The createQueueIfNotExists method can be used to ensure a queue exists:

var queueService = storage.createQueueService();
queueService.createQueueIfNotExists('taskqueue', function(error){
    if(!error){
        // Queue exists
    }
});

The createMessage method can then be called to insert the message into the queue:

var queueService = storage.createQueueService();
queueService.createMessage('taskqueue', 'Hello world!', function(error){
    if(!error){
        // Message inserted
    }
});

It is then possible to call the getMessage method, process the message and then call deleteMessage inside the callback. This two-step process ensures messages don't get lost when they are removed from the queue.

var queueService = storage.createQueueService(),
    queueName = 'taskqueue';
queueService.getMessages(queueName, function(error, serverMessages){
    if(!error){
        // Process the message in less than 30 seconds, the message
        // text is available in serverMessages[0].messagetext

        queueService.deleteMessage(queueName, serverMessages[0].messageid, serverMessages[0].popreceipt, function(error){
            if(!error){
                // Message deleted
            }
        });
    }
});

Related projects

• Microsoft Azure SDK for Node.js
• Microsoft Azure SDK for Node.js - Storage Blob
• Microsoft Azure SDK for Node.js - Storage Table
• Microsoft Azure SDK for Node.js - Storage Queue