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79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
"""
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Create the table described in `CreateTable`_.
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This example creates a table if it does not exist using chained
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callbacks.
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.. _CreateTable: http://docs.aws.amazon.com/amazondynamodb/latest/
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APIReference/API_CreateTable.html
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"""
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import logging
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import sys
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from sprockets.clients import dynamodb
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from tornado import ioloop
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LOGGER = logging.getLogger('create-database')
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TABLE_DEF = {
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'TableName': 'Thread',
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'AttributeDefinitions': [
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{'AttributeName': 'ForumName', 'AttributeType': 'S'},
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{'AttributeName': 'Subject', 'AttributeType': 'S'},
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{'AttributeName': 'LastPostDateTime', 'AttributeType': 'S'},
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],
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'KeySchema': [
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{'AttributeName': 'ForumName', 'KeyType': 'HASH'},
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{'AttributeName': 'Subject', 'KeyType': 'RANGE'},
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],
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'LocalSecondaryIndexes': [
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{
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'IndexName': 'LastPostIndex',
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'KeySchema': [
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{'AttributeName': 'ForumName', 'KeyType': 'HASH'},
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{'AttributeName': 'LastPostDateTime', 'KeyType': 'RANGE'},
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],
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'Projection': {
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'ProjectionType': 'KEYS_ONLY',
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},
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},
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],
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'ProvisionedThroughput': {
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'ReadCapacityUnits': 5,
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'WriteCapacityUnits': 5,
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}
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}
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dynamo = dynamodb.DynamoDB()
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iol = ioloop.IOLoop.instance()
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def on_table_described(describe_response):
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def on_created(create_response):
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try:
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result = create_response.result()
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LOGGER.info('table created - %r', result)
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iol.add_callback(iol.stop)
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except Exception:
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LOGGER.exception('failed to create table')
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sys.exit(-1)
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try:
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result = describe_response.result()
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LOGGER.info('found table %s, created %s',
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result['Table']['TableName'],
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result['Table']['CreationDateTime'])
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iol.add_callback(iol.stop)
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except Exception as error:
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LOGGER.warn('table not found, attempting to create: %s', error)
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next_future = dynamo.create_table(TABLE_DEF)
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iol.add_future(next_future, on_created)
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logging.basicConfig(level=logging.DEBUG,
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format='%(levelname)1.1s %(name)s: %(message)s')
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iol.add_future(dynamo.describe_table(TABLE_DEF['TableName']),
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on_table_described)
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iol.start()
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