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# SPDX-License-Identifier: GPL-3.0-or-later
# Haketilo proxy data and configuration (definition of fields of a class that
# will implement HaketiloState).
#
# This file is part of Hydrilla&Haketilo.
#
# Copyright (C) 2022 Wojtek Kosior
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
#
# I, Wojtek Kosior, thereby promise not to sue for violation of this
# file's license. Although I request that you do not make use this code
# in a proprietary program, I am not going to enforce this in court.
"""
This module defines fields that will later be part of a concrete HaketiloState
subtype.
"""
# Enable using with Python 3.7.
from __future__ import annotations
import sqlite3
import threading
import dataclasses as dc
import typing as t
from pathlib import Path
from contextlib import contextmanager
import sqlite3
from immutables import Map
from ... import pattern_tree
from .. import state
from .. import policies
PolicyTree = pattern_tree.PatternTree[policies.PolicyFactory]
#PayloadsDataMap = Map[state.PayloadRef, state.PayloadData]
DataById = t.Mapping[str, state.PayloadData]
# mypy needs to be corrected:
# https://stackoverflow.com/questions/70999513/conflict-between-mix-ins-for-abstract-dataclasses/70999704#70999704
@dc.dataclass # type: ignore[misc]
class HaketiloStateWithFields(state.HaketiloState):
"""...."""
store_dir: Path
connection: sqlite3.Connection
current_cursor: t.Optional[sqlite3.Cursor] = None
#settings: state.HaketiloGlobalSettings
policy_tree: PolicyTree = PolicyTree()
#payloads_data: PayloadsDataMap = Map()
payloads_data: DataById = dc.field(default_factory=dict)
lock: threading.RLock = dc.field(default_factory=threading.RLock)
@contextmanager
def cursor(self, lock: bool = False, transaction: bool = False) \
-> t.Iterator[sqlite3.Cursor]:
"""...."""
start_transaction = transaction and not self.connection.in_transaction
assert lock or not start_transaction
try:
if lock:
self.lock.acquire()
if self.current_cursor is not None:
yield self.current_cursor
return
self.current_cursor = self.connection.cursor()
if start_transaction:
self.current_cursor.execute('BEGIN TRANSACTION;')
try:
yield self.current_cursor
if start_transaction:
self.current_cursor.execute('COMMIT TRANSACTION;')
except:
if start_transaction:
self.current_cursor.execute('ROLLBACK TRANSACTION;')
raise
finally:
self.current_cursor = None
if lock:
self.lock.release()
def rebuild_structures(self, cursor: sqlite3.Cursor) -> None:
"""...."""
...
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