1 files changed, 112 insertions, 0 deletions
diff --git a/src/hydrilla/proxy/state_impl/base.py b/src/hydrilla/proxy/state_impl/base.py
new file mode 100644
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+++ b/src/hydrilla/proxy/state_impl/base.py
@@ -0,0 +1,112 @@
+# 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:
+        """...."""
+        ...