dammo

Basics

A Simple, efficient and complete DynamoDB driver for Node.js, with:

• Syntactic sweeteners/mapping to handle Amazon DynamoDB's JSON format in NodeJS
• Efficient and transparent authentication and authentication refresh using Amazon STS
• Integrated retry logic similar to Amazon's own PhP, Java libraries
• Currently in production in multiple independent organizations with more than 80 write/s, 60 read/s
• Support for all exposed DynamoDB operations

Discussion Group: http://groups.google.com/group/node-dynamodb

Usage

var ddb = require('dynamodb').ddb({ accessKeyId: '',
                                    secretAccessKey: '' });

Available options for the constructor are the following:

• accessKeyId: the AWS AccessKeyId to use
• secretAccessKey: the AWS SecretAccessKey associated
• endpoint: the Region endpoint to use (defaults to: dynamodb.us-east-1.amazonaws.com)
• agent: The NodeJS http.Agent to use (defaults to: undefined)
• sessionToken: forced temporary session credential (defaults to: undefined)
• sessionExpires: forced temeporary session credential (defaults to: undefined)

CreateTable

ddb.createTable('foo', { hash: ['id', ddb.schemaTypes().string],
                         range: ['time', ddb.schemaTypes().number] },
                {read: 10, write: 10}, function(err, details) {});

// res: { "CreationDateTime": 1.310506263362E9,
//        "KeySchema": { "HashKeyElement": { "AttributeName": "AttributeName1",
//                                           "AttributeType": "S"},
//                       "RangeKeyElement": { "AttributeName": "AttributeName2",
//                                            "AttributeType": "N"} },
//        "ProvisionedThroughput":{ "ReadCapacityUnits": 5,
//                                  "WriteCapacityUnits": 10 },
//        "TableName":"Table1",
//        "TableStatus":"CREATING" }

ListTables

ddb.listTables({}, function(err, res) {});

// res: { LastEvaluatedTableName: 'bar',
          TableNames: ['test','foo','bar'] }

DescribeTable

ddb.describeTable('a-table', function(err, res) {});

// res: { ... }

PutItem

// flat [string, number, string array or number array] based json object
var item = { score: 304,
             date: (new Date).getTime(),
             sha: '3d2d6963',
             usr: 'spolu',
             lng: ['node', 'c++'] };

ddb.putItem('a-table', item, {}, function(err, res, cap) {});

GetItem

ddb.getItem('a-table', '3d2d6963', null, {}, function(err, res, cap) {});

// res: { score: 304,
//        date: 123012398234,
//        sha: '3d2d6963',
//        usr: 'spolu',
//        lng: ['node', 'c++'] };

DeleteItem

ddb.deleteItem('a-table', 'sha', null, {}, function(err, res, cap) {});

UpdateItem

ddb.updateItem('a-table', '3d2d6963', null, { 'usr': { value: 'smthg' } }, {},
               function(err, res, cap) {});

ddb.consumedCapacity();

BatchGetItem

ddb.batchGetItem({'table': { keys: ['foo', 'bar'] }}, function(err, res) {
    if(err) {
      console.log(err);
    } else {
      console.log(res);
    }
 });

// res: { ConsumedCapacityUnits: 1.5,
          items: [...] };

BatchWriteItem

//ddb.batchWriteItem(PutRequest, DeleteRequest, cb)
ddb.batchWriteItem({'table': [item1, item2]}, {'table': ['foo', 'bar']}, function(err, res) {
    if(err) {
      console.log(err);
    } else {
      console.log(res);
    }
 });

// res: { UnprocessedItems: { ... } };

Query

ddb.query('test', '3d2d6963', {}, function(err, res, cap) {...});

// res: { count: 23,
//        lastEvaluatedKey: { hash: '3d2d6963' },
//        items: [...] };

Scan

ddb.scan('test', {}, function(err, res) {
    if(err) {
      console.log(err);
    } else {
      console.log(res);
    }
 });

// res: { count: 23,
//        lastEvaluatedKey: { hash: '3d2d6963' },
//        items: [...] };

More complete usage can be found in the examples directory

Run the Tests

Put in your environment:

export DYNAMODB_ACCESSKEYID=YOURACCESSKEYID
export DYNAMODB_SECRETACCESSKEY=YOURSECRETKEYID
export DYNAMODB_TEST_TABLE1=test

Make sure you have a test table created and available with sha as a hash key (string). Make sure to select Hash as the Primary Key Type. Then run:

make test

If you are getting one of these errors:

• User: ... is not authorized to perform: dynamodb:PutItem on resource you need to add AmazonDynamoDBFullAccess to the user in IAM policy editor.

License

Distributed under the MIT License.

Contributors

@karlseguin (Karl Seguin)
@imekinox (Juan Carlos del Valle)
@phstc (Pablo Cantero)
@cstivers78 (Chris Stivers)
@garo (Juho Mäkinen)
@tax (Paul Tax)
@alexbosworth (Alex Bosworth)
@jimbly (Jimb Esser)
@n1t0 (Anthony Moi)
@krasin
@aws-ew-dev