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import collections.abc
import io
import os
from abc import ABC, abstractmethod
from pathlib import Path
from types import MappingProxyType
from typing import Any, Generator, Tuple, Union
from .aio import AIOFile, FileIOType
ENCODING_MAP = MappingProxyType({
"utf-8": 4,
"utf-16": 8,
"UTF-8": 4,
"UTF-16": 8,
})
async def unicode_reader(
afp: AIOFile, chunk_size: int, offset: int, encoding: str = "utf-8",
) -> Tuple[int, str]:
if chunk_size < 0:
chunk_bytes = await afp.read_bytes(-1, offset)
return len(chunk_bytes), chunk_bytes.decode(encoding=encoding)
last_error = None
for retry in range(ENCODING_MAP.get(encoding, 4)):
chunk_bytes = await afp.read_bytes(chunk_size + retry, offset)
try:
chunk = chunk_bytes.decode(encoding=encoding)
break
except UnicodeDecodeError as e:
last_error = e
else:
raise last_error # type: ignore
chunk_size = len(chunk_bytes)
return chunk_size, chunk
class Reader(collections.abc.AsyncIterable):
__slots__ = "_chunk_size", "__offset", "file", "__lock", "encoding"
CHUNK_SIZE = 32 * 1024
def __init__(
self, aio_file: AIOFile, offset: int = 0,
chunk_size: int = CHUNK_SIZE,
):
self.__lock = asyncio.Lock()
self.__offset = int(offset)
self._chunk_size = int(chunk_size)
self.file = aio_file
self.encoding = self.file.encoding
async def read_chunk(self) -> Union[str, bytes]:
async with self.__lock:
if self.file.mode.binary:
chunk = await self.file.read_bytes(
self._chunk_size, self.__offset,
) # type: Union[str, bytes]
chunk_size = len(chunk)
else:
chunk_size, chunk = await unicode_reader(
self.file, self._chunk_size, self.__offset,
encoding=self.encoding,
)
self.__offset += chunk_size
return chunk
async def __anext__(self) -> Union[str, bytes]:
chunk = await self.read_chunk()
if not chunk:
raise StopAsyncIteration(chunk)
return chunk
def __aiter__(self) -> "Reader":
return self
class Writer:
__slots__ = "__chunk_size", "__offset", "__aio_file", "__lock"
def __init__(self, aio_file: AIOFile, offset: int = 0):
self.__offset = int(offset)
self.__aio_file = aio_file
self.__lock = asyncio.Lock()
async def __call__(self, data: Union[str, bytes]) -> None:
async with self.__lock:
if isinstance(data, str):
data = self.__aio_file.encode_bytes(data)
await self.__aio_file.write_bytes(data, self.__offset)
self.__offset += len(data)
class LineReader(collections.abc.AsyncIterable):
CHUNK_SIZE = 4192
def __init__(
self, aio_file: AIOFile, offset: int = 0,
chunk_size: int = CHUNK_SIZE, line_sep: str = "\n",
):
self.__reader = Reader(aio_file, chunk_size=chunk_size, offset=offset)
self._buffer = (
io.BytesIO() if aio_file.mode.binary else io.StringIO()
) # type: Any
self.linesep = (
aio_file.encode_bytes(line_sep)
if aio_file.mode.binary
else line_sep
)
async def readline(self) -> Union[str, bytes]:
while True:
line = self._buffer.readline()
if line and line.endswith(self.linesep):
return line
buffer_remainder = line + self._buffer.read()
self._buffer.truncate(0)
self._buffer.seek(0)
# No line in buffer, read more data
chunk = await self.__reader.read_chunk()
if not chunk:
# No more data to read, return any remaining content in the buffer
return buffer_remainder
# We have more data to read, write it to the buffer and handle it in the next iteration
self._buffer.write(buffer_remainder)
self._buffer.write(chunk)
self._buffer.seek(0)
async def __anext__(self) -> Union[bytes, str]:
line = await self.readline()
if not line:
# We are finished, close the buffer and raise StopAsyncIteration
self._buffer.close()
raise StopAsyncIteration(line)
return line
def __aiter__(self) -> "LineReader":
return self
class FileIOWrapperBase(ABC):
_READLINE_CHUNK_SIZE = 4192
def __init__(self, afp: AIOFile, *, offset: int = 0):
self._offset = offset
self._lock = asyncio.Lock()
self.file = afp
if self.file.mode.appending:
try:
self._offset = os.stat(afp.name).st_size
except FileNotFoundError:
self._offset = 0
@abstractmethod
async def read(self, length: int = -1) -> Any:
raise NotImplementedError
@abstractmethod
async def write(self, data: Any) -> int:
raise NotImplementedError
@abstractmethod
async def readline(
self, size: int = -1, newline: Any = ...,
) -> Union[str, bytes]:
raise NotImplementedError
def seek(self, offset: int) -> None:
self._offset = offset
def tell(self) -> int:
return self._offset
async def flush(self, sync_metadata: bool = False) -> None:
if sync_metadata:
await self.file.fsync()
else:
await self.file.fdsync()
async def close(self) -> None:
await self.file.close()
def __await__(self) -> Generator[None, None, "FileIOWrapperBase"]:
yield from self.file.__await__()
return self
async def __aenter__(self) -> "FileIOWrapperBase":
await self.file.open()
return self
async def __aexit__(self, *_: Any) -> None:
await self.close()
def __aiter__(self) -> LineReader:
return LineReader(self.file)
def iter_chunked(self, chunk_size: int = Reader.CHUNK_SIZE) -> Reader:
return Reader(self.file, chunk_size=chunk_size, offset=self._offset)
class BinaryFileWrapper(FileIOWrapperBase):
def __init__(self, afp: AIOFile):
if not afp.mode.binary:
raise ValueError("Expected file in binary mode")
super().__init__(afp)
async def __read(self, length: int) -> bytes:
data = await self.file.read_bytes(length, self._offset)
self._offset += len(data)
return data
async def read(self, length: int = -1) -> bytes:
async with self._lock:
return await self.__read(length)
async def write(self, data: bytes) -> int:
async with self._lock:
operation = self.file.write_bytes(data, self._offset)
self._offset += len(data)
await operation
return len(data)
async def readline(self, size: int = -1, newline: bytes = b"\n") -> bytes:
async with self._lock:
offset = self._offset
with io.BytesIO() as fp:
while True:
chunk = await self.__read(self._READLINE_CHUNK_SIZE)
if chunk:
if newline not in chunk:
fp.write(chunk)
continue
fp.write(chunk)
if 0 < size <= fp.tell():
fp.seek(size)
fp.truncate(size)
return fp.getvalue()
fp.seek(0)
line = fp.readline()
self._offset = offset + fp.tell()
return line
class TextFileWrapper(FileIOWrapperBase):
def __init__(self, afp: AIOFile):
if afp.mode.binary:
raise ValueError("Expected file in text mode")
super().__init__(afp)
self.encoding = self.file.encoding
async def __read(self, length: int) -> str:
chunk_size = 0
offset = self._offset
chunk = ""
while length < 0 or length > len(chunk):
part_offset, part = await unicode_reader(
self.file, length, offset, self.encoding,
)
if not part:
break
chunk += part
offset += part_offset
if chunk_size > length > 0:
chunk = chunk[:length]
offset = length
self._offset = offset
return chunk
async def read(self, length: int = -1) -> str:
async with self._lock:
return await self.__read(length)
async def write(self, data: str) -> int:
async with self._lock:
data_bytes = data.encode(self.encoding)
operation = self.file.write_bytes(data_bytes, self._offset)
self._offset += len(data_bytes)
await operation
return len(data_bytes)
async def readline(self, size: int = -1, newline: str = "\n") -> str:
async with self._lock:
offset = self._offset
with io.StringIO() as fp:
while True:
chunk = await self.__read(self._READLINE_CHUNK_SIZE)
if chunk:
if newline not in chunk:
fp.write(chunk)
continue
fp.write(chunk)
if 0 < size <= fp.tell():
fp.seek(size)
fp.truncate(size)
return fp.getvalue()
fp.seek(0)
line = fp.readline()
self._offset = offset + len(
line.encode(encoding=self.encoding),
)
return line
def async_open(
file_specifier: Union[str, Path, FileIOType],
mode: str = "r", *args: Any, **kwargs: Any,
) -> Union[BinaryFileWrapper, TextFileWrapper]:
if isinstance(file_specifier, (str, Path)):
afp = AIOFile(str(file_specifier), mode, *args, **kwargs)
else:
if args:
raise ValueError("Arguments denied when IO[Any] opening.")
afp = AIOFile.from_fp(file_specifier, **kwargs)
if not afp.mode.binary:
return TextFileWrapper(afp)
return BinaryFileWrapper(afp)
__all__ = (
"BinaryFileWrapper",
"FileIOWrapperBase",
"LineReader",
"Reader",
"TextFileWrapper",
"Writer",
"async_open",
"unicode_reader",
)
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