64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
# Copyright 2012 Anton Beloglazov
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from contracts import contract
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from neat.contracts_extra import *
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from sqlalchemy import *
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from sqlalchemy.sql import func
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from neat.db import Database
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import logging
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log = logging.getLogger(__name__)
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@contract
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def init_db(sql_connection):
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""" Initialize the database.
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:param sql_connection: A database connection URL.
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:type sql_connection: str
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:return: The initialized database.
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:rtype: Database
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"""
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engine = create_engine(sql_connection) # 'sqlite:///:memory:'
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metadata = MetaData()
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metadata.bind = engine
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hosts = Table('hosts', metadata,
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Column('id', Integer, primary_key=True),
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Column('hostname', String(255), nullable=False),
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Column('cpu_mhz', Integer, nullable=False),
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Column('ram', Integer, nullable=False))
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vms = Table('vms', metadata,
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Column('id', Integer, primary_key=True),
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Column('uuid', String(36), nullable=False))
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vm_resource_usage = \
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Table('vm_resource_usage', metadata,
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Column('id', Integer, primary_key=True),
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Column('vm_id', Integer, ForeignKey('vms.id'), nullable=False),
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Column('timestamp', DateTime, default=func.now()),
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Column('cpu_mhz', Integer, nullable=False))
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metadata.create_all()
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connection = engine.connect()
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db = Database(connection, hosts, vms, vm_resource_usage)
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log.debug('Initialized a DB connection to %s', sql_connection)
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return db
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