File size: 11,655 Bytes
b72ab63
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
import os
import sys
import uuid
import warnings
from ftplib import FTP, Error, error_perm
from typing import Any

from ..spec import AbstractBufferedFile, AbstractFileSystem
from ..utils import infer_storage_options, isfilelike


class FTPFileSystem(AbstractFileSystem):
    """A filesystem over classic FTP"""

    root_marker = "/"
    cachable = False
    protocol = "ftp"

    def __init__(
        self,
        host,
        port=21,
        username=None,
        password=None,
        acct=None,
        block_size=None,
        tempdir=None,
        timeout=30,
        encoding="utf-8",
        **kwargs,
    ):
        """
        You can use _get_kwargs_from_urls to get some kwargs from
        a reasonable FTP url.

        Authentication will be anonymous if username/password are not
        given.

        Parameters
        ----------
        host: str
            The remote server name/ip to connect to
        port: int
            Port to connect with
        username: str or None
            If authenticating, the user's identifier
        password: str of None
            User's password on the server, if using
        acct: str or None
            Some servers also need an "account" string for auth
        block_size: int or None
            If given, the read-ahead or write buffer size.
        tempdir: str
            Directory on remote to put temporary files when in a transaction
        timeout: int
            Timeout of the ftp connection in seconds
        encoding: str
            Encoding to use for directories and filenames in FTP connection
        """
        super().__init__(**kwargs)
        self.host = host
        self.port = port
        self.tempdir = tempdir or "/tmp"
        self.cred = username, password, acct
        self.timeout = timeout
        self.encoding = encoding
        if block_size is not None:
            self.blocksize = block_size
        else:
            self.blocksize = 2**16
        self._connect()

    def _connect(self):
        if sys.version_info >= (3, 9):
            self.ftp = FTP(timeout=self.timeout, encoding=self.encoding)
        elif self.encoding:
            warnings.warn("`encoding` not supported for python<3.9, ignoring")
            self.ftp = FTP(timeout=self.timeout)
        else:
            self.ftp = FTP(timeout=self.timeout)
        self.ftp.connect(self.host, self.port)
        self.ftp.login(*self.cred)

    @classmethod
    def _strip_protocol(cls, path):
        return "/" + infer_storage_options(path)["path"].lstrip("/").rstrip("/")

    @staticmethod
    def _get_kwargs_from_urls(urlpath):
        out = infer_storage_options(urlpath)
        out.pop("path", None)
        out.pop("protocol", None)
        return out

    def ls(self, path, detail=True, **kwargs):
        path = self._strip_protocol(path)
        out = []
        if path not in self.dircache:
            try:
                try:
                    out = [
                        (fn, details)
                        for (fn, details) in self.ftp.mlsd(path)
                        if fn not in [".", ".."]
                        and details["type"] not in ["pdir", "cdir"]
                    ]
                except error_perm:
                    out = _mlsd2(self.ftp, path)  # Not platform independent
                for fn, details in out:
                    if path == "/":
                        path = ""  # just for forming the names, below
                    details["name"] = "/".join([path, fn.lstrip("/")])
                    if details["type"] == "file":
                        details["size"] = int(details["size"])
                    else:
                        details["size"] = 0
                    if details["type"] == "dir":
                        details["type"] = "directory"
                self.dircache[path] = out
            except Error:
                try:
                    info = self.info(path)
                    if info["type"] == "file":
                        out = [(path, info)]
                except (Error, IndexError):
                    raise FileNotFoundError(path)
        files = self.dircache.get(path, out)
        if not detail:
            return sorted([fn for fn, details in files])
        return [details for fn, details in files]

    def info(self, path, **kwargs):
        # implement with direct method
        path = self._strip_protocol(path)
        if path == "/":
            # special case, since this dir has no real entry
            return {"name": "/", "size": 0, "type": "directory"}
        files = self.ls(self._parent(path).lstrip("/"), True)
        try:
            out = [f for f in files if f["name"] == path][0]
        except IndexError:
            raise FileNotFoundError(path)
        return out

    def get_file(self, rpath, lpath, **kwargs):
        if self.isdir(rpath):
            if not os.path.exists(lpath):
                os.mkdir(lpath)
            return
        if isfilelike(lpath):
            outfile = lpath
        else:
            outfile = open(lpath, "wb")

        def cb(x):
            outfile.write(x)

        self.ftp.retrbinary(
            f"RETR {rpath}",
            blocksize=self.blocksize,
            callback=cb,
        )
        if not isfilelike(lpath):
            outfile.close()

    def cat_file(self, path, start=None, end=None, **kwargs):
        if end is not None:
            return super().cat_file(path, start, end, **kwargs)
        out = []

        def cb(x):
            out.append(x)

        try:
            self.ftp.retrbinary(
                f"RETR {path}",
                blocksize=self.blocksize,
                rest=start,
                callback=cb,
            )
        except (Error, error_perm) as orig_exc:
            raise FileNotFoundError(path) from orig_exc
        return b"".join(out)

    def _open(
        self,
        path,
        mode="rb",
        block_size=None,
        cache_options=None,
        autocommit=True,
        **kwargs,
    ):
        path = self._strip_protocol(path)
        block_size = block_size or self.blocksize
        return FTPFile(
            self,
            path,
            mode=mode,
            block_size=block_size,
            tempdir=self.tempdir,
            autocommit=autocommit,
            cache_options=cache_options,
        )

    def _rm(self, path):
        path = self._strip_protocol(path)
        self.ftp.delete(path)
        self.invalidate_cache(self._parent(path))

    def rm(self, path, recursive=False, maxdepth=None):
        paths = self.expand_path(path, recursive=recursive, maxdepth=maxdepth)
        for p in reversed(paths):
            if self.isfile(p):
                self.rm_file(p)
            else:
                self.rmdir(p)

    def mkdir(self, path: str, create_parents: bool = True, **kwargs: Any) -> None:
        path = self._strip_protocol(path)
        parent = self._parent(path)
        if parent != self.root_marker and not self.exists(parent) and create_parents:
            self.mkdir(parent, create_parents=create_parents)

        self.ftp.mkd(path)
        self.invalidate_cache(self._parent(path))

    def makedirs(self, path: str, exist_ok: bool = False) -> None:
        path = self._strip_protocol(path)
        if self.exists(path):
            # NB: "/" does not "exist" as it has no directory entry
            if not exist_ok:
                raise FileExistsError(f"{path} exists without `exist_ok`")
            # exists_ok=True -> no-op
        else:
            self.mkdir(path, create_parents=True)

    def rmdir(self, path):
        path = self._strip_protocol(path)
        self.ftp.rmd(path)
        self.invalidate_cache(self._parent(path))

    def mv(self, path1, path2, **kwargs):
        path1 = self._strip_protocol(path1)
        path2 = self._strip_protocol(path2)
        self.ftp.rename(path1, path2)
        self.invalidate_cache(self._parent(path1))
        self.invalidate_cache(self._parent(path2))

    def __del__(self):
        self.ftp.close()

    def invalidate_cache(self, path=None):
        if path is None:
            self.dircache.clear()
        else:
            self.dircache.pop(path, None)
        super().invalidate_cache(path)


class TransferDone(Exception):
    """Internal exception to break out of transfer"""

    pass


class FTPFile(AbstractBufferedFile):
    """Interact with a remote FTP file with read/write buffering"""

    def __init__(
        self,
        fs,
        path,
        mode="rb",
        block_size="default",
        autocommit=True,
        cache_type="readahead",
        cache_options=None,
        **kwargs,
    ):
        super().__init__(
            fs,
            path,
            mode=mode,
            block_size=block_size,
            autocommit=autocommit,
            cache_type=cache_type,
            cache_options=cache_options,
            **kwargs,
        )
        if not autocommit:
            self.target = self.path
            self.path = "/".join([kwargs["tempdir"], str(uuid.uuid4())])

    def commit(self):
        self.fs.mv(self.path, self.target)

    def discard(self):
        self.fs.rm(self.path)

    def _fetch_range(self, start, end):
        """Get bytes between given byte limits

        Implemented by raising an exception in the fetch callback when the
        number of bytes received reaches the requested amount.

        Will fail if the server does not respect the REST command on
        retrieve requests.
        """
        out = []
        total = [0]

        def callback(x):
            total[0] += len(x)
            if total[0] > end - start:
                out.append(x[: (end - start) - total[0]])
                if end < self.size:
                    raise TransferDone
            else:
                out.append(x)

            if total[0] == end - start and end < self.size:
                raise TransferDone

        try:
            self.fs.ftp.retrbinary(
                f"RETR {self.path}",
                blocksize=self.blocksize,
                rest=start,
                callback=callback,
            )
        except TransferDone:
            try:
                # stop transfer, we got enough bytes for this block
                self.fs.ftp.abort()
                self.fs.ftp.getmultiline()
            except Error:
                self.fs._connect()

        return b"".join(out)

    def _upload_chunk(self, final=False):
        self.buffer.seek(0)
        self.fs.ftp.storbinary(
            f"STOR {self.path}", self.buffer, blocksize=self.blocksize, rest=self.offset
        )
        return True


def _mlsd2(ftp, path="."):
    """
    Fall back to using `dir` instead of `mlsd` if not supported.

    This parses a Linux style `ls -l` response to `dir`, but the response may
    be platform dependent.

    Parameters
    ----------
    ftp: ftplib.FTP
    path: str
        Expects to be given path, but defaults to ".".
    """
    lines = []
    minfo = []
    ftp.dir(path, lines.append)
    for line in lines:
        split_line = line.split()
        if len(split_line) < 9:
            continue
        this = (
            split_line[-1],
            {
                "modify": " ".join(split_line[5:8]),
                "unix.owner": split_line[2],
                "unix.group": split_line[3],
                "unix.mode": split_line[0],
                "size": split_line[4],
            },
        )
        if "d" == this[1]["unix.mode"][0]:
            this[1]["type"] = "dir"
        else:
            this[1]["type"] = "file"
        minfo.append(this)
    return minfo