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# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2023 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
# pylint: disable=abstract-method
import enum
from enum import IntEnum
import sqlalchemy as sa
from lvestats.orm.base import Base
from lvestats.orm.const import LVE_STATS_2_TABLENAME_PREFIX, SERVER_ID_LENGTH
class _EnumAsInteger(sa.types.TypeDecorator):
# NOTE(vlebedev): Taken as-is from https://stackoverflow.com/a/38786737/3344105
"""Column type for storing Python enums in a database INTEGER column.
This will behave erratically if a database value does not correspond to
a known enum value.
"""
impl = sa.types.SmallInteger # underlying database type
def __init__(self, enum_type):
super().__init__()
self.enum_type = enum_type
def process_bind_param(self, value, dialect):
if isinstance(value, self.enum_type):
return value.value
raise ValueError(
f'expected {self.enum_type.__name__} value, got {value.__class__.__name__}'
)
def process_result_value(self, value, dialect):
return self.enum_type(value)
def copy(self, **kwargs):
return _EnumAsInteger(self.enum_type)
@enum.unique
class BurstingEventType(IntEnum):
STOPPED = 0
STARTED = 1
bursting_events_table = sa.Table(
LVE_STATS_2_TABLENAME_PREFIX + 'bursting_events',
Base.metadata,
# 'server_id' is essential for proper functionality
# when used with a central database for multiple servers
sa.Column('server_id', sa.String(SERVER_ID_LENGTH), primary_key=True),
sa.Column('lve_id', sa.BigInteger, primary_key=True),
sa.Column(
'timestamp',
sa.Integer,
primary_key=True,
index=True,
comment='UNIX timestamp of the event (seconds precision)'
),
sa.Column('event_type', _EnumAsInteger(BurstingEventType), nullable=False),
)
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