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core.kompress: proper support for read_text/read_bytes against zstd/xz archives

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Dima Gerasimov 2023-03-01 00:45:20 +00:00 • committed by karlicoss
parent b94904f5ee
commit 4dfc4029c3
1 changed files with 36 additions and 14 deletions
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46
my/core/kompress.py
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@ -28,30 +28,44 @@ def is_compressed(p: Path) -> bool:
return any(p.name.endswith(ext) for ext in {Ext.xz, Ext.zip, Ext.lz4, Ext.zstd, Ext.zst, Ext.targz})
def _zstd_open(path: Path, *args, **kwargs) -> IO[str]:
def _zstd_open(path: Path, *args, **kwargs) -> IO:
import zstandard as zstd # type: ignore
fh = path.open('rb')
dctx = zstd.ZstdDecompressor()
reader = dctx.stream_reader(fh)
mode = kwargs.get('mode', 'rt')
if mode == 'rb':
return reader
else:
# must be text mode
kwargs.pop('mode') # TextIOWrapper doesn't like it
return io.TextIOWrapper(reader, **kwargs) # meh
# TODO returns protocol that we can call 'read' against?
# TODO use the 'dependent type' trick?
def kopen(path: PathIsh, *args, mode: str='rt', **kwargs) -> IO[str]:
# TODO handle mode in *rags?
# TODO use the 'dependent type' trick for return type?
def kopen(path: PathIsh, *args, mode: str='rt', **kwargs) -> IO:
# just in case, but I think this shouldn't be necessary anymore
# since when we cann .read_text, encoding is passed already
if mode in {'r', 'rt'}:
encoding = kwargs.get('encoding', 'utf8')
else:
encoding = None
kwargs['encoding'] = encoding
pp = Path(path)
name = pp.name
if name.endswith(Ext.xz):
import lzma
r = lzma.open(pp, mode, *args, **kwargs)
# should only happen for binary mode?
# file:///usr/share/doc/python3/html/library/lzma.html?highlight=lzma#lzma.open
assert not isinstance(r, lzma.LZMAFile), r
return r
# ugh. for lzma, 'r' means 'rb'
# https://github.com/python/cpython/blob/d01cf5072be5511595b6d0c35ace6c1b07716f8d/Lib/lzma.py#L97
# whereas for regular open, 'r' means 'rt'
# https://docs.python.org/3/library/functions.html#open
if mode == 'r':
mode = 'rt'
kwargs['mode'] = mode
return lzma.open(pp, *args, **kwargs)
elif name.endswith(Ext.zip):
# eh. this behaviour is a bit dodgy...
from zipfile import ZipFile
@ -72,7 +86,8 @@ def kopen(path: PathIsh, *args, mode: str='rt', **kwargs) -> IO[str]:
import lz4.frame # type: ignore
return lz4.frame.open(str(pp), mode, *args, **kwargs)
elif name.endswith(Ext.zstd) or name.endswith(Ext.zst):
return _zstd_open(pp, mode, *args, **kwargs)
kwargs['mode'] = mode
return _zstd_open(pp, *args, **kwargs)
elif name.endswith(Ext.targz):
import tarfile
# FIXME pass mode?
@ -104,8 +119,15 @@ class CPath(BasePath):
_accessor.open has to return file descriptor, doesn't work for compressed stuff.
"""
def open(self, *args, **kwargs):
kopen_kwargs = {}
mode = kwargs.get('mode')
if mode is not None:
kopen_kwargs['mode'] = mode
encoding = kwargs.get('encoding')
if encoding is not None:
kopen_kwargs['encoding'] = encoding
# TODO assert read only?
return kopen(str(self))
return kopen(str(self), **kopen_kwargs)
open = kopen # TODO deprecate