DbFactory + DbConnection
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parent
d29d1b1395
commit
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@ -8,15 +8,20 @@ from io import StringIO
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from typing import Any, Optional, IO, Type, Hashable
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__all__ = ('KVRequest', 'KVJson', 'DbConnection', 'DbFactory',)
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class Request:
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def __init__(self, future: Optional[asyncio.Future]):
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self.future = future
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def set_result(self, result):
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self.future and self.future.set_result(result)
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if self.future:
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self.future.set_result(result)
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def set_exception(self, exception):
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self.future and self.future.set_exception(exception)
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if self.future:
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self.future.set_exception(exception)
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class KVRequest(Request):
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@ -80,26 +85,30 @@ class ErrorRequest(Request):
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self.line = line
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async def wait(self):
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await self.future
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if self.future:
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await self.future
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class Db:
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__mmdb: Optional[dict]
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__loop: Optional[asyncio.AbstractEventLoop]
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__queue: Optional[asyncio.Queue[Request]]
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__file: Optional[IO[str]]
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__buffer: Optional[StringIO]
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__task: Optional[asyncio.Future]
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class DbConnection:
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__mmdb: dict
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__loop: asyncio.AbstractEventLoop
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__queue: asyncio.Queue[Request]
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__file: IO[str]
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__buffer: StringIO
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__task: asyncio.Future
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__initial_size: int
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def __init__(self, path: str, *, kvrequest_type: Type[KVRequest], buffersize=1048576):
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path = str(path)
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self.kvrequest_type = kvrequest_type
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self.buffersize = buffersize
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def __init__(
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self,
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factory: 'DbFactory',
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) -> None:
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self.factory = factory
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path = self.factory.path
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self.__path = pathlib.Path(path)
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self.__path_backup = pathlib.Path(path + '.backup')
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self.__path_recover = pathlib.Path(path + '.recover')
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self.__path_error = pathlib.Path(path + '.error')
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self.__task = None
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self.not_running = True
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def _queue_error(self, line: str):
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request = ErrorRequest(line, self.__loop.create_future())
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@ -110,7 +119,7 @@ class Db:
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size = 0
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for line in io:
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try:
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request = self.kvrequest_type.fromline(line)
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request = self.factory.kvrequest_type.fromline(line)
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db[request.key] = request.value
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size += len(line)
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except (json.JSONDecodeError, pickle.UnpicklingError, EOFError):
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@ -121,7 +130,7 @@ class Db:
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def db2io(self, db: dict, io: IO[str]) -> int:
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size = 0
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for key, value in db.items():
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size += io.write(self.kvrequest_type(key, value, None).line())
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size += io.write(self.factory.kvrequest_type(key, value, None).line())
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return size
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def get(self, key: Any, default: Any):
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@ -130,15 +139,15 @@ class Db:
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async def set(self, key: Any, value: Any):
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self.__mmdb[key] = value
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future = self.__loop.create_future()
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self.__queue.put_nowait(self.kvrequest_type(key, value, future))
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self.__queue.put_nowait(self.factory.kvrequest_type(key, value, future))
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await future
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def set_nowait(self, key: Any, value: Any):
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self.__mmdb[key] = value
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self.__queue.put_nowait(self.kvrequest_type(key, value, None))
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self.__queue.put_nowait(self.factory.kvrequest_type(key, value, None))
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async def _dump_buffer_or_request_so(self, request: KVRequest):
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if self.__buffer.tell() >= self.buffersize:
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if self.__buffer.tell() >= self.factory.buffersize:
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await self._dump_buffer()
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request.set_result(None)
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else:
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@ -181,7 +190,7 @@ class Db:
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await self.__loop.run_in_executor(None, file.write, line.strip() + '\n')
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async def _handle_request(self, request: Request):
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if isinstance(request, self.kvrequest_type):
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if isinstance(request, self.factory.kvrequest_type):
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await self._write(request.line(), request)
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elif isinstance(request, DumpRequest):
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await self._dump_buffer()
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@ -244,47 +253,50 @@ class Db:
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self.__task = self.__loop.create_task(self._background_task())
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async def _initialize(self):
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assert self.__task is None
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assert self.not_running
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self.__loop = asyncio.get_event_loop()
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await self._initialize_queue()
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await self._initialize_mmdb()
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await self._start_task()
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self.not_running = False
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async def __aenter__(self):
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await self._initialize()
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return self
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@classmethod
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async def create(cls, factory: 'DbFactory') -> 'DbConnection':
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dbconnection = DbConnection(factory)
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await dbconnection._initialize()
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return dbconnection
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async def _aclose(self):
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async def aclose(self):
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if not self.__task.done():
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await self.__queue.join()
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self.__task.cancel()
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await self._dump_buffer()
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self.__file.close()
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await self._build_file(self.__mmdb)
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self.not_running = True
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del self.__mmdb
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del self.__loop
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del self.__queue
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del self.__file
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del self.__buffer
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del self.__task
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del self.__initial_size
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def _uninitialize(self):
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self.__mmdb = None
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self.__loop = None
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self.__queue = None
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self.__file = None
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self.__buffer = None
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self.__task = None
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class DbFactory:
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def __init__(self, path: str | pathlib.Path, *, kvrequest_type: Type[KVRequest], buffersize=1048576):
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self.path = path = str(path)
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self.kvrequest_type = kvrequest_type
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self.buffersize = buffersize
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async def __aenter__(self):
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self.db = await DbConnection.create(self)
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return self.db
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async def __aexit__(self, exc_type, exc_val, exc_tb):
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await self._aclose()
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self._uninitialize()
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def cursor(self, **kwargs):
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return Cursor(self, **kwargs)
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await self.db.aclose()
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class Cursor:
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def __init__(self, db: Db, default=None):
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self.default = default
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self.db = db
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def __getitem__(self, item):
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return self.db.get(item, self.default)
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def __setitem__(self, key, value):
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self.db.set_nowait(key, value)
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class Db(DbFactory, DbConnection):
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def __init__(self, path: str | pathlib.Path, *, kvrequest_type: Type[KVRequest], buffersize=1048576):
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DbFactory.__init__(self, path, kvrequest_type=kvrequest_type, buffersize=buffersize)
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DbConnection.__init__(self, self)
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