135 lines
4.3 KiB
Python
135 lines
4.3 KiB
Python
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import zipfile
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import fsspec
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from fsspec.archive import AbstractArchiveFileSystem
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class ZipFileSystem(AbstractArchiveFileSystem):
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"""Read/Write contents of ZIP archive as a file-system
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Keeps file object open while instance lives.
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This class is pickleable, but not necessarily thread-safe
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"""
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root_marker = ""
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protocol = "zip"
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cachable = False
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def __init__(
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self,
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fo="",
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mode="r",
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target_protocol=None,
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target_options=None,
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compression=zipfile.ZIP_STORED,
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allowZip64=True,
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compresslevel=None,
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**kwargs,
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):
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"""
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Parameters
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----------
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fo: str or file-like
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Contains ZIP, and must exist. If a str, will fetch file using
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:meth:`~fsspec.open_files`, which must return one file exactly.
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mode: str
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Accept: "r", "w", "a"
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target_protocol: str (optional)
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If ``fo`` is a string, this value can be used to override the
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FS protocol inferred from a URL
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target_options: dict (optional)
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Kwargs passed when instantiating the target FS, if ``fo`` is
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a string.
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compression, allowZip64, compresslevel: passed to ZipFile
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Only relevant when creating a ZIP
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"""
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super().__init__(self, **kwargs)
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if mode not in set("rwa"):
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raise ValueError(f"mode '{mode}' no understood")
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self.mode = mode
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if isinstance(fo, str):
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if mode == "a":
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m = "r+b"
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else:
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m = mode + "b"
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fo = fsspec.open(
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fo, mode=m, protocol=target_protocol, **(target_options or {})
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)
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self.force_zip_64 = allowZip64
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self.of = fo
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self.fo = fo.__enter__() # the whole instance is a context
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self.zip = zipfile.ZipFile(
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self.fo,
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mode=mode,
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compression=compression,
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allowZip64=allowZip64,
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compresslevel=compresslevel,
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)
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self.dir_cache = None
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@classmethod
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def _strip_protocol(cls, path):
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# zip file paths are always relative to the archive root
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return super()._strip_protocol(path).lstrip("/")
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def __del__(self):
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if hasattr(self, "zip"):
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self.close()
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del self.zip
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def close(self):
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"""Commits any write changes to the file. Done on ``del`` too."""
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self.zip.close()
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def _get_dirs(self):
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if self.dir_cache is None or self.mode in set("wa"):
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# when writing, dir_cache is always in the ZipFile's attributes,
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# not read from the file.
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files = self.zip.infolist()
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self.dir_cache = {
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dirname.rstrip("/"): {
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"name": dirname.rstrip("/"),
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"size": 0,
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"type": "directory",
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}
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for dirname in self._all_dirnames(self.zip.namelist())
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}
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for z in files:
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f = {s: getattr(z, s, None) for s in zipfile.ZipInfo.__slots__}
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f.update(
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{
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"name": z.filename.rstrip("/"),
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"size": z.file_size,
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"type": ("directory" if z.is_dir() else "file"),
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}
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)
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self.dir_cache[f["name"]] = f
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def pipe_file(self, path, value, **kwargs):
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# override upstream, because we know the exact file size in this case
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self.zip.writestr(path, value, **kwargs)
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def _open(
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self,
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path,
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mode="rb",
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block_size=None,
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autocommit=True,
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cache_options=None,
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**kwargs,
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):
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path = self._strip_protocol(path)
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if "r" in mode and self.mode in set("wa"):
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if self.exists(path):
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raise OSError("ZipFS can only be open for reading or writing, not both")
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raise FileNotFoundError(path)
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if "r" in self.mode and "w" in mode:
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raise OSError("ZipFS can only be open for reading or writing, not both")
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out = self.zip.open(path, mode.strip("b"), force_zip64=self.force_zip_64)
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if "r" in mode:
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info = self.info(path)
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out.size = info["size"]
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out.name = info["name"]
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return out
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