242 lines
9.4 KiB
Python
242 lines
9.4 KiB
Python
from datetime import datetime, timedelta
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from dateutil.relativedelta import relativedelta
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from sqlalchemy import Column, VARCHAR, CHAR, ForeignKey, DATETIME, update, and_, inspect, text
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from sqlalchemy.engine import Engine
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from sqlalchemy.orm import sessionmaker, declarative_base
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Base = declarative_base()
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class Origin(Base):
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__tablename__ = "origin"
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origin_ref = Column(CHAR(length=36), primary_key=True, unique=True, index=True) # uuid4
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# service_instance_xid = Column(CHAR(length=36), nullable=False, index=True) # uuid4 # not necessary, we only support one service_instance_xid ('INSTANCE_REF')
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hostname = Column(VARCHAR(length=256), nullable=True)
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guest_driver_version = Column(VARCHAR(length=10), nullable=True)
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os_platform = Column(VARCHAR(length=256), nullable=True)
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os_version = Column(VARCHAR(length=256), nullable=True)
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def __repr__(self):
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return f'Origin(origin_ref={self.origin_ref}, hostname={self.hostname})'
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def serialize(self) -> dict:
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return {
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'origin_ref': self.origin_ref,
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# 'service_instance_xid': self.service_instance_xid,
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'hostname': self.hostname,
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'guest_driver_version': self.guest_driver_version,
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'os_platform': self.os_platform,
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'os_version': self.os_version,
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}
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@staticmethod
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def deserialize(j) -> "Origin":
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return Origin(
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origin_ref=j.get('origin_ref'),
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hostname=j.get('hostname'),
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guest_driver_version=j.get('guest_driver_version'),
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os_platform=j.get('os_platform'),
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os_version=j.get('os_version'),
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)
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@staticmethod
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def create_statement(engine: Engine):
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from sqlalchemy.schema import CreateTable
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return CreateTable(Origin.__table__).compile(engine)
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@staticmethod
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def create_or_update(engine: Engine, origin: "Origin"):
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session = sessionmaker(bind=engine)()
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entity = session.query(Origin).filter(Origin.origin_ref == origin.origin_ref).first()
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if entity is None:
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session.add(origin)
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else:
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x = dict(
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hostname=origin.hostname,
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guest_driver_version=origin.guest_driver_version,
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os_platform=origin.os_platform,
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os_version=origin.os_version
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)
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session.execute(update(Origin).where(Origin.origin_ref == origin.origin_ref).values(**x))
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session.commit()
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session.flush()
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session.close()
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@staticmethod
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def delete(engine: Engine, origin_refs: [str] = None) -> int:
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session = sessionmaker(bind=engine)()
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if origin_refs is None:
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deletions = session.query(Origin).delete()
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else:
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deletions = session.query(Origin).filter(Origin.origin_ref in origin_refs).delete()
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session.commit()
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session.close()
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return deletions
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class Lease(Base):
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__tablename__ = "lease"
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lease_ref = Column(CHAR(length=36), primary_key=True, nullable=False, index=True) # uuid4
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origin_ref = Column(CHAR(length=36), ForeignKey(Origin.origin_ref, ondelete='CASCADE'), nullable=False, index=True) # uuid4
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# scope_ref = Column(CHAR(length=36), nullable=False, index=True) # uuid4 # not necessary, we only support one scope_ref ('ALLOTMENT_REF')
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lease_created = Column(DATETIME(), nullable=False)
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lease_expires = Column(DATETIME(), nullable=False)
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lease_updated = Column(DATETIME(), nullable=False)
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def __repr__(self):
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return f'Lease(origin_ref={self.origin_ref}, lease_ref={self.lease_ref}, expires={self.lease_expires})'
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def serialize(self, renewal_period: float, renewal_delta: timedelta) -> dict:
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lease_renewal = int(Lease.calculate_renewal(renewal_period, renewal_delta).total_seconds())
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lease_renewal = self.lease_updated + relativedelta(seconds=lease_renewal)
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return {
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'lease_ref': self.lease_ref,
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'origin_ref': self.origin_ref,
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# 'scope_ref': self.scope_ref,
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'lease_created': self.lease_created.isoformat(),
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'lease_expires': self.lease_expires.isoformat(),
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'lease_updated': self.lease_updated.isoformat(),
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'lease_renewal': lease_renewal.isoformat(),
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}
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@staticmethod
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def deserialize(j) -> "Lease":
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return Lease(
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lease_ref=j.get('lease_ref'),
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origin_ref=j.get('origin_ref'),
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lease_created=j.get('lease_created'),
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lease_expires=j.get('lease_expires'),
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lease_updated=j.get('lease_updated'),
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lease_renewal=j.get('lease_renewal'),
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)
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@staticmethod
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def create_statement(engine: Engine):
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from sqlalchemy.schema import CreateTable
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return CreateTable(Lease.__table__).compile(engine)
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@staticmethod
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def create_or_update(engine: Engine, lease: "Lease"):
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session = sessionmaker(bind=engine)()
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entity = session.query(Lease).filter(Lease.lease_ref == lease.lease_ref).first()
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if entity is None:
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if lease.lease_updated is None:
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lease.lease_updated = lease.lease_created
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session.add(lease)
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else:
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x = dict(origin_ref=lease.origin_ref, lease_expires=lease.lease_expires, lease_updated=lease.lease_updated)
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session.execute(update(Lease).where(Lease.lease_ref == lease.lease_ref).values(**x))
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session.commit()
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session.flush()
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session.close()
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@staticmethod
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def find_by_origin_ref(engine: Engine, origin_ref: str) -> ["Lease"]:
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session = sessionmaker(bind=engine)()
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entities = session.query(Lease).filter(Lease.origin_ref == origin_ref).all()
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session.close()
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return entities
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@staticmethod
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def find_by_lease_ref(engine: Engine, lease_ref: str) -> "Lease":
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session = sessionmaker(bind=engine)()
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entity = session.query(Lease).filter(Lease.lease_ref == lease_ref).first()
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session.close()
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return entity
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@staticmethod
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def find_by_origin_ref_and_lease_ref(engine: Engine, origin_ref: str, lease_ref: str) -> "Lease":
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session = sessionmaker(bind=engine)()
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entity = session.query(Lease).filter(and_(Lease.origin_ref == origin_ref, Lease.lease_ref == lease_ref)).first()
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session.close()
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return entity
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@staticmethod
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def renew(engine: Engine, lease: "Lease", lease_expires: datetime, lease_updated: datetime):
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session = sessionmaker(bind=engine)()
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x = dict(lease_expires=lease_expires, lease_updated=lease_updated)
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session.execute(update(Lease).where(and_(Lease.origin_ref == lease.origin_ref, Lease.lease_ref == lease.lease_ref)).values(**x))
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session.commit()
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session.close()
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@staticmethod
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def cleanup(engine: Engine, origin_ref: str) -> int:
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session = sessionmaker(bind=engine)()
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deletions = session.query(Lease).filter(Lease.origin_ref == origin_ref).delete()
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session.commit()
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session.close()
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return deletions
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@staticmethod
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def delete(engine: Engine, lease_ref: str) -> int:
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session = sessionmaker(bind=engine)()
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deletions = session.query(Lease).filter(Lease.lease_ref == lease_ref).delete()
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session.commit()
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session.close()
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return deletions
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@staticmethod
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def calculate_renewal(renewal_period: float, delta: timedelta) -> timedelta:
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"""
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import datetime
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LEASE_RENEWAL_PERIOD=0.2 # 20%
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delta = datetime.timedelta(days=1)
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renew = delta.total_seconds() * LEASE_RENEWAL_PERIOD
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renew = datetime.timedelta(seconds=renew)
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expires = delta - renew # 19.2
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import datetime
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LEASE_RENEWAL_PERIOD=0.15 # 15%
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delta = datetime.timedelta(days=90)
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renew = delta.total_seconds() * LEASE_RENEWAL_PERIOD
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renew = datetime.timedelta(seconds=renew)
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expires = delta - renew # 76 days, 12:00:00 hours
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"""
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renew = delta.total_seconds() * renewal_period
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renew = timedelta(seconds=renew)
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return renew
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def init(engine: Engine):
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tables = [Origin, Lease]
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db = inspect(engine)
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session = sessionmaker(bind=engine)()
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for table in tables:
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if not db.dialect.has_table(engine.connect(), table.__tablename__):
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session.execute(text(str(table.create_statement(engine))))
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session.commit()
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session.close()
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def migrate(engine: Engine):
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db = inspect(engine)
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def upgrade_1_0_to_1_1():
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x = db.dialect.get_columns(engine.connect(), Lease.__tablename__)
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x = next(_ for _ in x if _['name'] == 'origin_ref')
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if x['primary_key'] > 0:
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print('Found old database schema with "origin_ref" as primary-key in "lease" table. Dropping table!')
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print(' Your leases are recreated on next renewal!')
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print(' If an error message appears on the client, you can ignore it.')
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Lease.__table__.drop(bind=engine)
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init(engine)
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# def upgrade_1_2_to_1_3():
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# x = db.dialect.get_columns(engine.connect(), Lease.__tablename__)
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# x = next((_ for _ in x if _['name'] == 'scope_ref'), None)
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# if x is None:
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# Lease.scope_ref.compile()
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# column_name = Lease.scope_ref.name
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# column_type = Lease.scope_ref.type.compile(engine.dialect)
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# engine.execute(f'ALTER TABLE "{Lease.__tablename__}" ADD COLUMN "{column_name}" {column_type}')
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upgrade_1_0_to_1_1()
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# upgrade_1_2_to_1_3()
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