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from __future__ import absolute_import, division, print_function
import zipfile
import fsspec
from fsspec.archive import AbstractArchiveFileSystem
class ZipFileSystem(AbstractArchiveFileSystem):
"""Read/Write contents of ZIP archive as a file-system
Keeps file object open while instance lives.
This class is pickleable, but not necessarily thread-safe
"""
root_marker = ""
protocol = "zip"
cachable = False
def __init__(
self,
fo="",
mode="r",
target_protocol=None,
target_options=None,
compression=zipfile.ZIP_STORED,
allowZip64=True,
compresslevel=None,
**kwargs,
):
"""
Parameters
----------
fo: str or file-like
Contains ZIP, and must exist. If a str, will fetch file using
:meth:`~fsspec.open_files`, which must return one file exactly.
mode: str
Accept: "r", "w", "a"
target_protocol: str (optional)
If ``fo`` is a string, this value can be used to override the
FS protocol inferred from a URL
target_options: dict (optional)
Kwargs passed when instantiating the target FS, if ``fo`` is
a string.
compression, allowZip64, compresslevel: passed to ZipFile
Only relevant when creating a ZIP
"""
super().__init__(self, **kwargs)
if mode not in set("rwa"):
raise ValueError(f"mode '{mode}' no understood")
self.mode = mode
if isinstance(fo, str):
fo = fsspec.open(
fo, mode=mode + "b", protocol=target_protocol, **(target_options or {})
)
self.of = fo
self.fo = fo.__enter__() # the whole instance is a context
self.zip = zipfile.ZipFile(
self.fo,
mode=mode,
compression=compression,
allowZip64=allowZip64,
compresslevel=compresslevel,
)
self.dir_cache = None
@classmethod
def _strip_protocol(cls, path):
# zip file paths are always relative to the archive root
return super()._strip_protocol(path).lstrip("/")
def __del__(self):
if hasattr(self, "zip"):
self.close()
del self.zip
def close(self):
"""Commits any write changes to the file. Done on ``del`` too."""
self.zip.close()
def _get_dirs(self):
if self.dir_cache is None or self.mode in set("wa"):
# when writing, dir_cache is always in the ZipFile's attributes,
# not read from the file.
files = self.zip.infolist()
self.dir_cache = {
dirname + "/": {"name": dirname + "/", "size": 0, "type": "directory"}
for dirname in self._all_dirnames(self.zip.namelist())
}
for z in files:
f = {s: getattr(z, s, None) for s in zipfile.ZipInfo.__slots__}
f.update(
{
"name": z.filename,
"size": z.file_size,
"type": ("directory" if z.is_dir() else "file"),
}
)
self.dir_cache[f["name"]] = f
def pipe_file(self, path, value, **kwargs):
# override upstream, because we know the exact file size in this case
self.zip.writestr(path, value, **kwargs)
def _open(
self,
path,
mode="rb",
block_size=None,
autocommit=True,
cache_options=None,
**kwargs,
):
path = self._strip_protocol(path)
if "r" in mode and self.mode in set("wa"):
if self.exists(path):
raise IOError("ZipFS can only be open for reading or writing, not both")
raise FileNotFoundError(path)
if "r" in self.mode and "w" in mode:
raise IOError("ZipFS can only be open for reading or writing, not both")
out = self.zip.open(path, mode.strip("b"))
if "r" in mode:
info = self.info(path)
out.size = info["size"]
out.name = info["name"]
return out
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