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"""Kombu transport using SQLAlchemy as the message store."""
from __future__ import absolute_import, unicode_literals
import datetime
from sqlalchemy import (Column, Integer, String, Text, DateTime,
Sequence, Boolean, ForeignKey, SmallInteger, Index)
from sqlalchemy.ext.declarative import declarative_base, declared_attr
from sqlalchemy.orm import relation
from sqlalchemy.schema import MetaData
class_registry = {}
metadata = MetaData()
ModelBase = declarative_base(metadata=metadata, class_registry=class_registry)
class Queue(object):
"""The queue class."""
__table_args__ = {'sqlite_autoincrement': True, 'mysql_engine': 'InnoDB'}
id = Column(Integer, Sequence('queue_id_sequence'), primary_key=True,
autoincrement=True)
name = Column(String(200), unique=True)
def __init__(self, name):
self.name = name
def __str__(self):
return '<Queue({self.name})>'.format(self=self)
@declared_attr
def messages(cls):
return relation('Message', backref='queue', lazy='noload')
class Message(object):
"""The message class."""
__table_args__ = (
Index('ix_kombu_message_timestamp_id', 'timestamp', 'id'),
{'sqlite_autoincrement': True, 'mysql_engine': 'InnoDB'}
)
id = Column(Integer, Sequence('message_id_sequence'),
primary_key=True, autoincrement=True)
visible = Column(Boolean, default=True, index=True)
sent_at = Column('timestamp', DateTime, nullable=True, index=True,
onupdate=datetime.datetime.now)
payload = Column(Text, nullable=False)
version = Column(SmallInteger, nullable=False, default=1)
__mapper_args__ = {'version_id_col': version}
def __init__(self, payload, queue):
self.payload = payload
self.queue = queue
def __str__(self):
return '<Message: {0.sent_at} {0.payload} {0.queue_id}>'.format(self)
@declared_attr
def queue_id(self):
return Column(
Integer,
ForeignKey(
'%s.id' % class_registry['Queue'].__tablename__,
name='FK_kombu_message_queue'
)
)
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