305 lines
8.4 KiB
Python
305 lines
8.4 KiB
Python
import errno
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import io
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import os
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import secrets
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import shutil
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from contextlib import suppress
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from functools import cached_property, wraps
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from urllib.parse import parse_qs
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from fsspec.spec import AbstractFileSystem
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from fsspec.utils import (
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get_package_version_without_import,
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infer_storage_options,
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mirror_from,
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tokenize,
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)
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def wrap_exceptions(func):
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@wraps(func)
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def wrapper(*args, **kwargs):
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try:
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return func(*args, **kwargs)
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except OSError as exception:
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if not exception.args:
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raise
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message, *args = exception.args
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if isinstance(message, str) and "does not exist" in message:
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raise FileNotFoundError(errno.ENOENT, message) from exception
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else:
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raise
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return wrapper
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PYARROW_VERSION = None
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class ArrowFSWrapper(AbstractFileSystem):
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"""FSSpec-compatible wrapper of pyarrow.fs.FileSystem.
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Parameters
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----------
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fs : pyarrow.fs.FileSystem
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"""
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root_marker = "/"
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def __init__(self, fs, **kwargs):
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global PYARROW_VERSION
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PYARROW_VERSION = get_package_version_without_import("pyarrow")
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self.fs = fs
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super().__init__(**kwargs)
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@property
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def protocol(self):
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return self.fs.type_name
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@cached_property
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def fsid(self):
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return "hdfs_" + tokenize(self.fs.host, self.fs.port)
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@classmethod
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def _strip_protocol(cls, path):
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ops = infer_storage_options(path)
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path = ops["path"]
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if path.startswith("//"):
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# special case for "hdfs://path" (without the triple slash)
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path = path[1:]
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return path
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def ls(self, path, detail=False, **kwargs):
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path = self._strip_protocol(path)
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from pyarrow.fs import FileSelector
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entries = [
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self._make_entry(entry)
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for entry in self.fs.get_file_info(FileSelector(path))
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]
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if detail:
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return entries
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else:
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return [entry["name"] for entry in entries]
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def info(self, path, **kwargs):
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path = self._strip_protocol(path)
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[info] = self.fs.get_file_info([path])
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return self._make_entry(info)
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def exists(self, path):
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path = self._strip_protocol(path)
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try:
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self.info(path)
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except FileNotFoundError:
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return False
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else:
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return True
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def _make_entry(self, info):
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from pyarrow.fs import FileType
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if info.type is FileType.Directory:
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kind = "directory"
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elif info.type is FileType.File:
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kind = "file"
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elif info.type is FileType.NotFound:
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raise FileNotFoundError(errno.ENOENT, os.strerror(errno.ENOENT), info.path)
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else:
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kind = "other"
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return {
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"name": info.path,
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"size": info.size,
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"type": kind,
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"mtime": info.mtime,
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}
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@wrap_exceptions
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def cp_file(self, path1, path2, **kwargs):
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path1 = self._strip_protocol(path1).rstrip("/")
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path2 = self._strip_protocol(path2).rstrip("/")
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with self._open(path1, "rb") as lstream:
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tmp_fname = f"{path2}.tmp.{secrets.token_hex(6)}"
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try:
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with self.open(tmp_fname, "wb") as rstream:
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shutil.copyfileobj(lstream, rstream)
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self.fs.move(tmp_fname, path2)
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except BaseException: # noqa
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with suppress(FileNotFoundError):
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self.fs.delete_file(tmp_fname)
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raise
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@wrap_exceptions
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def mv(self, path1, path2, **kwargs):
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path1 = self._strip_protocol(path1).rstrip("/")
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path2 = self._strip_protocol(path2).rstrip("/")
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self.fs.move(path1, path2)
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@wrap_exceptions
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def rm_file(self, path):
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path = self._strip_protocol(path)
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self.fs.delete_file(path)
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@wrap_exceptions
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def rm(self, path, recursive=False, maxdepth=None):
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path = self._strip_protocol(path).rstrip("/")
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if self.isdir(path):
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if recursive:
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self.fs.delete_dir(path)
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else:
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raise ValueError("Can't delete directories without recursive=False")
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else:
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self.fs.delete_file(path)
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@wrap_exceptions
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def _open(self, path, mode="rb", block_size=None, seekable=True, **kwargs):
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if mode == "rb":
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if seekable:
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method = self.fs.open_input_file
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else:
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method = self.fs.open_input_stream
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elif mode == "wb":
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method = self.fs.open_output_stream
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elif mode == "ab":
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method = self.fs.open_append_stream
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else:
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raise ValueError(f"unsupported mode for Arrow filesystem: {mode!r}")
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_kwargs = {}
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if mode != "rb" or not seekable:
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if int(PYARROW_VERSION.split(".")[0]) >= 4:
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# disable compression auto-detection
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_kwargs["compression"] = None
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stream = method(path, **_kwargs)
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return ArrowFile(self, stream, path, mode, block_size, **kwargs)
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@wrap_exceptions
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def mkdir(self, path, create_parents=True, **kwargs):
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path = self._strip_protocol(path)
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if create_parents:
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self.makedirs(path, exist_ok=True)
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else:
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self.fs.create_dir(path, recursive=False)
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@wrap_exceptions
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def makedirs(self, path, exist_ok=False):
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path = self._strip_protocol(path)
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self.fs.create_dir(path, recursive=True)
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@wrap_exceptions
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def rmdir(self, path):
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path = self._strip_protocol(path)
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self.fs.delete_dir(path)
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@wrap_exceptions
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def modified(self, path):
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path = self._strip_protocol(path)
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return self.fs.get_file_info(path).mtime
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def cat_file(self, path, start=None, end=None, **kwargs):
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kwargs["seekable"] = start not in [None, 0]
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return super().cat_file(path, start=None, end=None, **kwargs)
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def get_file(self, rpath, lpath, **kwargs):
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kwargs["seekable"] = False
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super().get_file(rpath, lpath, **kwargs)
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@mirror_from(
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"stream",
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[
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"read",
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"seek",
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"tell",
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"write",
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"readable",
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"writable",
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"close",
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"size",
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"seekable",
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],
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)
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class ArrowFile(io.IOBase):
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def __init__(self, fs, stream, path, mode, block_size=None, **kwargs):
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self.path = path
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self.mode = mode
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self.fs = fs
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self.stream = stream
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self.blocksize = self.block_size = block_size
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self.kwargs = kwargs
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def __enter__(self):
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return self
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def __exit__(self, *args):
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return self.close()
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class HadoopFileSystem(ArrowFSWrapper):
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"""A wrapper on top of the pyarrow.fs.HadoopFileSystem
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to connect it's interface with fsspec"""
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protocol = "hdfs"
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def __init__(
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self,
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host="default",
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port=0,
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user=None,
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kerb_ticket=None,
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replication=3,
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extra_conf=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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host: str
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Hostname, IP or "default" to try to read from Hadoop config
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port: int
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Port to connect on, or default from Hadoop config if 0
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user: str or None
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If given, connect as this username
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kerb_ticket: str or None
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If given, use this ticket for authentication
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replication: int
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set replication factor of file for write operations. default value is 3.
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extra_conf: None or dict
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Passed on to HadoopFileSystem
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"""
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from pyarrow.fs import HadoopFileSystem
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fs = HadoopFileSystem(
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host=host,
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port=port,
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user=user,
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kerb_ticket=kerb_ticket,
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replication=replication,
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extra_conf=extra_conf,
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)
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super().__init__(fs=fs, **kwargs)
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@staticmethod
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def _get_kwargs_from_urls(path):
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ops = infer_storage_options(path)
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out = {}
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if ops.get("host", None):
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out["host"] = ops["host"]
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if ops.get("username", None):
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out["user"] = ops["username"]
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if ops.get("port", None):
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out["port"] = ops["port"]
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if ops.get("url_query", None):
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queries = parse_qs(ops["url_query"])
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if queries.get("replication", None):
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out["replication"] = int(queries["replication"][0])
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return out
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