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386 lines
11 KiB
386 lines
11 KiB
5 months ago
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import os
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import sys
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import uuid
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import warnings
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from ftplib import FTP, Error, error_perm
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from typing import Any
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from ..spec import AbstractBufferedFile, AbstractFileSystem
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from ..utils import infer_storage_options, isfilelike
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class FTPFileSystem(AbstractFileSystem):
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"""A filesystem over classic FTP"""
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root_marker = "/"
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cachable = False
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protocol = "ftp"
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def __init__(
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self,
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host,
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port=21,
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username=None,
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password=None,
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acct=None,
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block_size=None,
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tempdir=None,
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timeout=30,
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encoding="utf-8",
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**kwargs,
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):
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"""
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You can use _get_kwargs_from_urls to get some kwargs from
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a reasonable FTP url.
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Authentication will be anonymous if username/password are not
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given.
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Parameters
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----------
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host: str
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The remote server name/ip to connect to
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port: int
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Port to connect with
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username: str or None
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If authenticating, the user's identifier
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password: str of None
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User's password on the server, if using
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acct: str or None
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Some servers also need an "account" string for auth
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block_size: int or None
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If given, the read-ahead or write buffer size.
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tempdir: str
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Directory on remote to put temporary files when in a transaction
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timeout: int
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Timeout of the ftp connection in seconds
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encoding: str
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Encoding to use for directories and filenames in FTP connection
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"""
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super().__init__(**kwargs)
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self.host = host
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self.port = port
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self.tempdir = tempdir or "/tmp"
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self.cred = username, password, acct
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self.timeout = timeout
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self.encoding = encoding
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if block_size is not None:
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self.blocksize = block_size
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else:
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self.blocksize = 2**16
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self._connect()
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def _connect(self):
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if sys.version_info >= (3, 9):
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self.ftp = FTP(timeout=self.timeout, encoding=self.encoding)
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elif self.encoding:
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warnings.warn("`encoding` not supported for python<3.9, ignoring")
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self.ftp = FTP(timeout=self.timeout)
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else:
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self.ftp = FTP(timeout=self.timeout)
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self.ftp.connect(self.host, self.port)
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self.ftp.login(*self.cred)
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@classmethod
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def _strip_protocol(cls, path):
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return "/" + infer_storage_options(path)["path"].lstrip("/").rstrip("/")
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@staticmethod
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def _get_kwargs_from_urls(urlpath):
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out = infer_storage_options(urlpath)
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out.pop("path", None)
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out.pop("protocol", None)
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return out
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def ls(self, path, detail=True, **kwargs):
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path = self._strip_protocol(path)
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out = []
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if path not in self.dircache:
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try:
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try:
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out = [
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(fn, details)
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for (fn, details) in self.ftp.mlsd(path)
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if fn not in [".", ".."]
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and details["type"] not in ["pdir", "cdir"]
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]
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except error_perm:
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out = _mlsd2(self.ftp, path) # Not platform independent
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for fn, details in out:
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if path == "/":
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path = "" # just for forming the names, below
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details["name"] = "/".join([path, fn.lstrip("/")])
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if details["type"] == "file":
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details["size"] = int(details["size"])
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else:
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details["size"] = 0
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if details["type"] == "dir":
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details["type"] = "directory"
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self.dircache[path] = out
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except Error:
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try:
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info = self.info(path)
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if info["type"] == "file":
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out = [(path, info)]
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except (Error, IndexError):
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raise FileNotFoundError(path)
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files = self.dircache.get(path, out)
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if not detail:
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return sorted([fn for fn, details in files])
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return [details for fn, details in files]
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def info(self, path, **kwargs):
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# implement with direct method
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path = self._strip_protocol(path)
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if path == "/":
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# special case, since this dir has no real entry
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return {"name": "/", "size": 0, "type": "directory"}
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files = self.ls(self._parent(path).lstrip("/"), True)
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try:
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out = [f for f in files if f["name"] == path][0]
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except IndexError:
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raise FileNotFoundError(path)
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return out
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def get_file(self, rpath, lpath, **kwargs):
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if self.isdir(rpath):
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if not os.path.exists(lpath):
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os.mkdir(lpath)
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return
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if isfilelike(lpath):
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outfile = lpath
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else:
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outfile = open(lpath, "wb")
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def cb(x):
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outfile.write(x)
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self.ftp.retrbinary(
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f"RETR {rpath}",
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blocksize=self.blocksize,
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callback=cb,
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)
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if not isfilelike(lpath):
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outfile.close()
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def cat_file(self, path, start=None, end=None, **kwargs):
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if end is not None:
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return super().cat_file(path, start, end, **kwargs)
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out = []
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def cb(x):
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out.append(x)
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try:
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self.ftp.retrbinary(
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f"RETR {path}",
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blocksize=self.blocksize,
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rest=start,
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callback=cb,
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)
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except (Error, error_perm) as orig_exc:
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raise FileNotFoundError(path) from orig_exc
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return b"".join(out)
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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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cache_options=None,
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autocommit=True,
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**kwargs,
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):
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path = self._strip_protocol(path)
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block_size = block_size or self.blocksize
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return FTPFile(
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self,
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path,
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mode=mode,
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block_size=block_size,
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tempdir=self.tempdir,
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autocommit=autocommit,
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cache_options=cache_options,
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)
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def _rm(self, path):
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path = self._strip_protocol(path)
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self.ftp.delete(path)
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self.invalidate_cache(self._parent(path))
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def rm(self, path, recursive=False, maxdepth=None):
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paths = self.expand_path(path, recursive=recursive, maxdepth=maxdepth)
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for p in reversed(paths):
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if self.isfile(p):
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self.rm_file(p)
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else:
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self.rmdir(p)
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def mkdir(self, path: str, create_parents: bool = True, **kwargs: Any) -> None:
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path = self._strip_protocol(path)
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parent = self._parent(path)
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if parent != self.root_marker and not self.exists(parent) and create_parents:
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self.mkdir(parent, create_parents=create_parents)
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self.ftp.mkd(path)
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self.invalidate_cache(self._parent(path))
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def makedirs(self, path: str, exist_ok: bool = False) -> None:
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path = self._strip_protocol(path)
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if self.exists(path):
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# NB: "/" does not "exist" as it has no directory entry
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if not exist_ok:
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raise FileExistsError(f"{path} exists without `exist_ok`")
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# exists_ok=True -> no-op
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else:
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self.mkdir(path, create_parents=True)
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def rmdir(self, path):
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path = self._strip_protocol(path)
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self.ftp.rmd(path)
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self.invalidate_cache(self._parent(path))
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def mv(self, path1, path2, **kwargs):
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path1 = self._strip_protocol(path1)
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path2 = self._strip_protocol(path2)
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self.ftp.rename(path1, path2)
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self.invalidate_cache(self._parent(path1))
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self.invalidate_cache(self._parent(path2))
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def __del__(self):
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self.ftp.close()
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def invalidate_cache(self, path=None):
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if path is None:
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self.dircache.clear()
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else:
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self.dircache.pop(path, None)
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super().invalidate_cache(path)
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class TransferDone(Exception):
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"""Internal exception to break out of transfer"""
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pass
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class FTPFile(AbstractBufferedFile):
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"""Interact with a remote FTP file with read/write buffering"""
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def __init__(
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self,
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fs,
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path,
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mode="rb",
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block_size="default",
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autocommit=True,
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cache_type="readahead",
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cache_options=None,
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**kwargs,
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):
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super().__init__(
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fs,
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path,
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mode=mode,
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block_size=block_size,
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autocommit=autocommit,
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cache_type=cache_type,
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cache_options=cache_options,
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**kwargs,
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)
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if not autocommit:
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self.target = self.path
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self.path = "/".join([kwargs["tempdir"], str(uuid.uuid4())])
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def commit(self):
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self.fs.mv(self.path, self.target)
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def discard(self):
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self.fs.rm(self.path)
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def _fetch_range(self, start, end):
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"""Get bytes between given byte limits
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Implemented by raising an exception in the fetch callback when the
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number of bytes received reaches the requested amount.
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Will fail if the server does not respect the REST command on
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retrieve requests.
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"""
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out = []
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total = [0]
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def callback(x):
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total[0] += len(x)
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if total[0] > end - start:
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out.append(x[: (end - start) - total[0]])
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if end < self.size:
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raise TransferDone
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else:
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out.append(x)
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if total[0] == end - start and end < self.size:
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raise TransferDone
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try:
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self.fs.ftp.retrbinary(
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f"RETR {self.path}",
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blocksize=self.blocksize,
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rest=start,
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callback=callback,
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)
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except TransferDone:
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try:
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# stop transfer, we got enough bytes for this block
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self.fs.ftp.abort()
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self.fs.ftp.getmultiline()
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except Error:
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self.fs._connect()
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return b"".join(out)
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def _upload_chunk(self, final=False):
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self.buffer.seek(0)
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self.fs.ftp.storbinary(
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f"STOR {self.path}", self.buffer, blocksize=self.blocksize, rest=self.offset
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)
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return True
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def _mlsd2(ftp, path="."):
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"""
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Fall back to using `dir` instead of `mlsd` if not supported.
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This parses a Linux style `ls -l` response to `dir`, but the response may
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be platform dependent.
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|
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Parameters
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----------
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ftp: ftplib.FTP
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path: str
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Expects to be given path, but defaults to ".".
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"""
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lines = []
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minfo = []
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ftp.dir(path, lines.append)
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for line in lines:
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split_line = line.split()
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if len(split_line) < 9:
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continue
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this = (
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split_line[-1],
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{
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"modify": " ".join(split_line[5:8]),
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"unix.owner": split_line[2],
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"unix.group": split_line[3],
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"unix.mode": split_line[0],
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"size": split_line[4],
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},
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)
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if "d" == this[1]["unix.mode"][0]:
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this[1]["type"] = "dir"
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else:
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this[1]["type"] = "file"
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minfo.append(this)
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return minfo
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