mirror of
https://github.com/PiBrewing/craftbeerpi4.git
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390 lines
12 KiB
Python
390 lines
12 KiB
Python
# Copyright 2018 John Reese
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# Licensed under the MIT license
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"""
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Core implementation of aiosqlite proxies
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"""
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import asyncio
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import logging
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import sqlite3
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import sys
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import warnings
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from functools import partial
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from pathlib import Path
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from queue import Empty, Queue
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from threading import Thread
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from typing import (
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Any,
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AsyncIterator,
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Callable,
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Generator,
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Iterable,
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Optional,
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Type,
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Union,
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)
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from warnings import warn
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from .context import contextmanager
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from .cursor import Cursor
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__all__ = ["connect", "Connection", "Cursor"]
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LOG = logging.getLogger("aiosqlite")
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def get_loop(future: asyncio.Future) -> asyncio.AbstractEventLoop:
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if sys.version_info >= (3, 7):
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return future.get_loop()
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else:
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return future._loop
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class Connection(Thread):
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def __init__(
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self,
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connector: Callable[[], sqlite3.Connection],
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iter_chunk_size: int,
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loop: Optional[asyncio.AbstractEventLoop] = None,
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) -> None:
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super().__init__()
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self._running = True
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self._connection: Optional[sqlite3.Connection] = None
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self._connector = connector
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self._tx: Queue = Queue()
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self._iter_chunk_size = iter_chunk_size
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if loop is not None:
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warn(
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"aiosqlite.Connection no longer uses the `loop` parameter",
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DeprecationWarning,
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)
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@property
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def _conn(self) -> sqlite3.Connection:
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if self._connection is None:
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raise ValueError("no active connection")
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return self._connection
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def _execute_insert(
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self, sql: str, parameters: Iterable[Any]
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) -> Optional[sqlite3.Row]:
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cursor = self._conn.execute(sql, parameters)
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cursor.execute("SELECT last_insert_rowid()")
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return cursor.fetchone()
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def _execute_fetchall(
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self, sql: str, parameters: Iterable[Any]
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) -> Iterable[sqlite3.Row]:
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cursor = self._conn.execute(sql, parameters)
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return cursor.fetchall()
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def run(self) -> None:
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"""
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Execute function calls on a separate thread.
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:meta private:
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"""
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while self._running:
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try:
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future, function = self._tx.get(timeout=0.1)
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except Empty:
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continue
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try:
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LOG.debug("executing %s", function)
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result = function()
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LOG.debug("returning %s", result)
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def set_result(fut, result):
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if not fut.done():
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fut.set_result(result)
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get_loop(future).call_soon_threadsafe(set_result, future, result)
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except BaseException as e:
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LOG.info("returning exception %s", e)
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def set_exception(fut, e):
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if not fut.done():
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fut.set_exception(e)
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get_loop(future).call_soon_threadsafe(set_exception, future, e)
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async def _execute(self, fn, *args, **kwargs):
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"""Queue a function with the given arguments for execution."""
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function = partial(fn, *args, **kwargs)
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future = asyncio.get_event_loop().create_future()
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self._tx.put_nowait((future, function))
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return await future
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async def _connect(self) -> "Connection":
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"""Connect to the actual sqlite database."""
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if self._connection is None:
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try:
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self._connection = await self._execute(self._connector)
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except Exception:
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self._running = False
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self._connection = None
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raise
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return self
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def __await__(self) -> Generator[Any, None, "Connection"]:
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self.start()
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return self._connect().__await__()
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async def __aenter__(self) -> "Connection":
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return await self
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async def __aexit__(self, exc_type, exc_val, exc_tb) -> None:
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await self.close()
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@contextmanager
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async def cursor(self) -> Cursor:
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"""Create an aiosqlite cursor wrapping a sqlite3 cursor object."""
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return Cursor(self, await self._execute(self._conn.cursor))
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async def commit(self) -> None:
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"""Commit the current transaction."""
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await self._execute(self._conn.commit)
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async def rollback(self) -> None:
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"""Roll back the current transaction."""
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await self._execute(self._conn.rollback)
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async def close(self) -> None:
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"""Complete queued queries/cursors and close the connection."""
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try:
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await self._execute(self._conn.close)
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except Exception:
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LOG.info("exception occurred while closing connection")
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raise
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finally:
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self._running = False
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self._connection = None
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@contextmanager
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async def execute(self, sql: str, parameters: Iterable[Any] = None) -> Cursor:
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"""Helper to create a cursor and execute the given query."""
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if parameters is None:
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parameters = []
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cursor = await self._execute(self._conn.execute, sql, parameters)
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return Cursor(self, cursor)
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@contextmanager
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async def execute_insert(
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self, sql: str, parameters: Iterable[Any] = None
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) -> Optional[sqlite3.Row]:
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"""Helper to insert and get the last_insert_rowid."""
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if parameters is None:
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parameters = []
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return await self._execute(self._execute_insert, sql, parameters)
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@contextmanager
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async def execute_fetchall(
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self, sql: str, parameters: Iterable[Any] = None
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) -> Iterable[sqlite3.Row]:
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"""Helper to execute a query and return all the data."""
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if parameters is None:
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parameters = []
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return await self._execute(self._execute_fetchall, sql, parameters)
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@contextmanager
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async def executemany(
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self, sql: str, parameters: Iterable[Iterable[Any]]
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) -> Cursor:
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"""Helper to create a cursor and execute the given multiquery."""
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cursor = await self._execute(self._conn.executemany, sql, parameters)
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return Cursor(self, cursor)
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@contextmanager
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async def executescript(self, sql_script: str) -> Cursor:
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"""Helper to create a cursor and execute a user script."""
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cursor = await self._execute(self._conn.executescript, sql_script)
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return Cursor(self, cursor)
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async def interrupt(self) -> None:
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"""Interrupt pending queries."""
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return self._conn.interrupt()
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async def create_function(
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self, name: str, num_params: int, func: Callable, deterministic: bool = False
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) -> None:
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"""
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Create user-defined function that can be later used
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within SQL statements. Must be run within the same thread
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that query executions take place so instead of executing directly
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against the connection, we defer this to `run` function.
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In Python 3.8 and above, if *deterministic* is true, the created
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function is marked as deterministic, which allows SQLite to perform
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additional optimizations. This flag is supported by SQLite 3.8.3 or
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higher, ``NotSupportedError`` will be raised if used with older
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versions.
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"""
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if sys.version_info >= (3, 8):
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await self._execute(
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self._conn.create_function,
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name,
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num_params,
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func,
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deterministic=deterministic,
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)
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else:
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if deterministic:
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warnings.warn(
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"Deterministic function support is only available on "
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'Python 3.8+. Function "{}" will be registered as '
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"non-deterministic as per SQLite defaults.".format(name)
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)
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await self._execute(self._conn.create_function, name, num_params, func)
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@property
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def in_transaction(self) -> bool:
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return self._conn.in_transaction
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@property
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def isolation_level(self) -> str:
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return self._conn.isolation_level
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@isolation_level.setter
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def isolation_level(self, value: str) -> None:
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self._conn.isolation_level = value
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@property
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def row_factory(self) -> "Optional[Type]": # py3.5.2 compat (#24)
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return self._conn.row_factory
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@row_factory.setter
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def row_factory(self, factory: "Optional[Type]") -> None: # py3.5.2 compat (#24)
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self._conn.row_factory = factory
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@property
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def text_factory(self) -> Type:
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return self._conn.text_factory
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@text_factory.setter
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def text_factory(self, factory: Type) -> None:
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self._conn.text_factory = factory
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@property
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def total_changes(self) -> int:
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return self._conn.total_changes
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async def enable_load_extension(self, value: bool) -> None:
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await self._execute(self._conn.enable_load_extension, value) # type: ignore
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async def load_extension(self, path: str):
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await self._execute(self._conn.load_extension, path) # type: ignore
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async def set_progress_handler(
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self, handler: Callable[[], Optional[int]], n: int
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) -> None:
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await self._execute(self._conn.set_progress_handler, handler, n)
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async def set_trace_callback(self, handler: Callable) -> None:
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await self._execute(self._conn.set_trace_callback, handler)
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async def iterdump(self) -> AsyncIterator[str]:
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"""
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Return an async iterator to dump the database in SQL text format.
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Example::
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async for line in db.iterdump():
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...
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"""
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dump_queue: Queue = Queue()
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def dumper():
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try:
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for line in self._conn.iterdump():
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dump_queue.put_nowait(line)
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dump_queue.put_nowait(None)
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except Exception:
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LOG.exception("exception while dumping db")
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dump_queue.put_nowait(None)
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raise
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fut = self._execute(dumper)
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task = asyncio.ensure_future(fut)
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while True:
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try:
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line: Optional[str] = dump_queue.get_nowait()
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if line is None:
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break
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yield line
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except Empty:
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if task.done():
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LOG.warning("iterdump completed unexpectedly")
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break
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await asyncio.sleep(0.01)
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await task
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async def backup(
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self,
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target: Union["Connection", sqlite3.Connection],
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*,
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pages: int = 0,
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progress: Optional[Callable[[int, int, int], None]] = None,
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name: str = "main",
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sleep: float = 0.250
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) -> None:
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"""
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Make a backup of the current database to the target database.
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Takes either a standard sqlite3 or aiosqlite Connection object as the target.
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"""
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if sys.version_info < (3, 7):
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raise RuntimeError("backup() method is only available on Python 3.7+")
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if isinstance(target, Connection):
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target = target._conn
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await self._execute(
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self._conn.backup,
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target,
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pages=pages,
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progress=progress,
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name=name,
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sleep=sleep,
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)
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def connect(
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database: Union[str, Path],
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*,
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iter_chunk_size=64,
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loop: Optional[asyncio.AbstractEventLoop] = None,
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**kwargs: Any
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) -> Connection:
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"""Create and return a connection proxy to the sqlite database."""
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if loop is not None:
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warn(
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"aiosqlite.connect() no longer uses the `loop` parameter",
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DeprecationWarning,
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)
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def connector() -> sqlite3.Connection:
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if isinstance(database, str):
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loc = database
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elif isinstance(database, bytes):
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loc = database.decode("utf-8")
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else:
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loc = str(database)
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return sqlite3.connect(loc, **kwargs)
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return Connection(connector, iter_chunk_size)
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