#!/usr/bin/python
# -*- coding: utf-8 -*-
"""The ORM module defining the SQL model for notifications."""
import uuid
from time import sleep
from datetime import datetime
from json import loads
from peewee import Model, CharField, TextField, DateTimeField, UUIDField, OperationalError, IntegerField
from playhouse.migrate import SchemaMigrator, migrate
from playhouse.db_url import connect
from .config import get_config
from .jsonpath import parse
SCHEMA_MAJOR = 2
SCHEMA_MINOR = 0
DB = connect(get_config().get('database', 'peewee_url'))
[docs]class OrmSync(object):
"""
Special module for syncing the orm.
This module should incorporate a schema migration strategy.
The supported versions migrating forward must be in a versions array
containing tuples for major and minor versions.
The version tuples are directly translated to method names in the
orm_update class for the update between those versions.
Example Version Control::
class orm_update:
versions = [
(0, 1),
(0, 2),
(1, 0),
(1, 1)
]
def update_0_1_to_0_2():
pass
def update_0_2_to_1_0():
pass
The body of the update should follow peewee migration practices.
http://docs.peewee-orm.com/en/latest/peewee/playhouse.html#migrate
"""
versions = [
(0, 0),
(1, 0),
(2, 0)
]
[docs] @staticmethod
def dbconn_blocking():
"""Wait for the db connection."""
dbcon_attempts = get_config().getint('database', 'connect_attempts')
dbcon_wait = get_config().getint('database', 'connect_wait')
while dbcon_attempts:
try:
EventMatch.database_connect()
return
except OperationalError:
# couldnt connect, potentially wait and try again
sleep(dbcon_wait)
dbcon_attempts -= 1
raise OperationalError('Failed database connect retry.')
[docs] @classmethod
def update_0_0_to_1_0(cls):
"""Update by adding the new table."""
if not EventMatch.table_exists():
EventMatch.create_table()
migrator = SchemaMigrator(DB)
migrate(migrator.drop_column('eventmatch', 'auth'))
[docs] @classmethod
def update_1_0_to_2_0(cls):
"""Update by adding the auth column."""
migrator = SchemaMigrator(DB)
migrate(
migrator.add_column(
'eventmatch',
'auth',
TextField(null=True)
)
)
[docs] @classmethod
def update_tables(cls):
"""Update the database to the current version."""
verlist = cls.versions
db_ver = NotificationSystem.get_version()
if verlist.index(verlist[-1]) == verlist.index(db_ver):
# we have the current version don't update
return
with EventMatch.atomic():
for db_ver in verlist[verlist.index(db_ver):-1]:
next_db_ver = verlist[verlist.index(db_ver)+1]
method_name = 'update_{}_to_{}'.format(
'{}_{}'.format(*db_ver),
'{}_{}'.format(*next_db_ver)
)
getattr(cls, method_name)()
NotificationSystem.drop_table()
NotificationSystem.create_table()
NotificationSystem.get_or_create_version()
# pylint: disable=too-few-public-methods
[docs]class BaseModel(Model):
"""Auto-generated by pwiz."""
class Meta(object):
"""Map to the database connected above."""
database = DB
[docs] @classmethod
def database_connect(cls):
"""
Make sure database is connected.
Trying to connect a second
time *does* cause problems.
"""
# pylint: disable=no-member
if not cls._meta.database.is_closed():
cls._meta.database.close()
cls._meta.database.connect()
# pylint: enable=no-member
[docs] @classmethod
def database_close(cls):
"""
Close the database connection.
Closing already closed database
is not a problem, so continue on.
"""
# pylint: disable=no-member
if not cls._meta.database.is_closed():
cls._meta.database.close()
# pylint: enable=no-member
[docs] @classmethod
def atomic(cls):
"""Do the database atomic action."""
return cls._meta.database.atomic()
[docs]class NotificationSystem(BaseModel):
"""Notification Schema Version Model."""
part = CharField(primary_key=True)
value = IntegerField(default=-1)
[docs] @classmethod
def get_or_create_version(cls):
"""Set or create the current version of the schema."""
if not cls.table_exists():
return (0, 0)
major = cls.get_or_create(part='major', value=SCHEMA_MAJOR)
minor = cls.get_or_create(part='minor', value=SCHEMA_MINOR)
return (major, minor)
[docs] @classmethod
def get_version(cls):
"""Get the current version as a tuple."""
if not cls.table_exists():
return (0, 0)
return (cls.get(part='major').value, cls.get(part='minor').value)
[docs] @classmethod
def is_equal(cls):
"""Check to see if schema version matches code version."""
major, minor = cls.get_version()
return major == SCHEMA_MAJOR and minor == SCHEMA_MINOR
[docs] @classmethod
def is_safe(cls):
"""Check to see if the schema version is safe for the code."""
major, _minor = cls.get_version()
return major == SCHEMA_MAJOR
[docs]class EventMatch(BaseModel):
"""Events matching via jsonpath per user."""
uuid = UUIDField(primary_key=True, default=uuid.uuid4, index=True)
name = CharField(index=True)
jsonpath = TextField()
user = CharField(index=True)
disabled = DateTimeField(index=True, null=True, default=None)
error = TextField(null=True)
target_url = TextField()
version = CharField(default='v0.1')
# JSONField is extension specific and we are using URLs to bind
# to a database backend
extensions = TextField(default='{}')
auth = TextField(default='{}', null=True)
created = DateTimeField(default=datetime.now, index=True)
updated = DateTimeField(default=datetime.now, index=True)
deleted = DateTimeField(null=True, index=True)
# pylint: disable=too-few-public-methods
class Meta(object):
"""The meta class that contains db connection."""
database = DB
# pylint: enable=too-few-public-methods
[docs] def validate_jsonpath(self):
"""Validate the jsonpath string."""
parse(self.jsonpath)
return True
[docs] def to_hash(self):
"""Convert the object to a json serializable hash."""
ret_obj = {}
for field_name in self._meta.sorted_field_names:
ret_obj[field_name] = getattr(self, field_name)
ret_obj['uuid'] = str(ret_obj['uuid'])
ret_obj['extensions'] = loads(ret_obj['extensions'])
ret_obj['auth'] = loads(ret_obj['auth'])
for dt_element in ['disabled', 'deleted', 'updated', 'created']:
if getattr(self, dt_element):
# pylint: disable=no-member
ret_obj[dt_element] = getattr(self, dt_element).isoformat()
# pylint: enable=no-member
return ret_obj