ddbmock 0.3.1

Presentation

DynamoDB is a minimalistic NoSQL engine provided by Amazon as a part of their AWS product.

DynamoDB allows you to store documents composed of unicode, number or binary data as well are sets. Each tables must define a hash_key and may define a range_key. All other fields are optional.

DynamoDB is really awesome but is terribly slooooow with managment tasks. This makes it completly unusable in test environements

ddbmock brings a nice, tiny, in-memory implementation of DynamoDB along with much better and detailed error messages. Among its niceties, it features a double entry point:

• regular network based entry-point with 1:1 correspondance with stock DynamoDB

• embeded entry-point with seamless boto intergration 1, ideal to avoid spinning yet another server.

What is/will ddbmock be useful for ?

• running unit test FAST. DONE

• running functional test FAST. DONE

• experiment with DynamoDB API. DONE

• plan Throughput usage. WIP (low level foundation done)

• plan actual storage space requirements. DONE (describe table returns accurate size !)

• perform simulations with accurate limitations. Even some undocumented “features” are accurate :)

Current status

ddbmock is an experimental project and is currently under heavy development. It also may be discontinued at any time.

• support full table life-cycle

• support full item life-cycle

• support for all item limitations

• accurate size and date reporting

• preliminary support of Query, Scan and BatchGetItem

• no limits on concurent table operations

• no limits for request/response size nor item count in those

See http://ddbmock.readthedocs.org/en/latest/pages/status.html for detailed up-to-date status.

Example usage

$ pserve development.ini # launch the server on 0.0.0.0:6543

import boto
from ddbmock import connect_ddbmock

# Use the provided helper to connect your *own* endpoint
db = connect_ddbmock()

# Done ! just use it wherever in your project as usual.
db.list_tables() # get list of tables (empty at this stage)

def connect_ddbmock(host='localhost', port=6543):
    import boto
    from boto.regioninfo import RegionInfo
    endpoint = '{}:{}'.format(host, port)
    region = RegionInfo(name='ddbmock', endpoint=endpoint)
    return boto.connect_dynamodb(region=region, port=port, is_secure=False)

import boto
from ddbmock import connect_boto

# Wire-up boto and ddbmock together
db = connect_boto()

# Done ! just use it wherever in your project as usual.
db.list_tables() # get list of tables (empty at this stage)

Requirements

• Python 2.7.x

• Pyramid >= 1.3

• Boto >= 2.5.0 (optional)

• NO AWS account :)

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