aboutsummaryrefslogtreecommitdiff
path: root/youtube_dl/downloader/http.py
blob: 8a6638cc2d47c4afa08104d77e0877f92749ac8a (plain)
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
from __future__ import unicode_literals

import errno
import os
import socket
import time
import re

from .common import FileDownloader
from ..compat import compat_urllib_error
from ..utils import (
    ContentTooShortError,
    encodeFilename,
    sanitize_open,
    sanitized_Request,
    write_xattr,
    XAttrMetadataError,
    XAttrUnavailableError,
)


class HttpFD(FileDownloader):
    def real_download(self, filename, info_dict):
        url = info_dict['url']

        class DownloadContext(dict):
            __getattr__ = dict.get
            __setattr__ = dict.__setitem__
            __delattr__ = dict.__delitem__

        ctx = DownloadContext()
        ctx.filename = filename
        ctx.tmpfilename = self.temp_name(filename)
        ctx.stream = None

        # Do not include the Accept-Encoding header
        headers = {'Youtubedl-no-compression': 'True'}
        add_headers = info_dict.get('http_headers')
        if add_headers:
            headers.update(add_headers)
        basic_request = sanitized_Request(url, None, headers)
        request = sanitized_Request(url, None, headers)

        is_test = self.params.get('test', False)

        if is_test:
            request.add_header('Range', 'bytes=0-%s' % str(self._TEST_FILE_SIZE - 1))

        ctx.open_mode = 'wb'
        ctx.resume_len = 0

        if self.params.get('continuedl', True):
            # Establish possible resume length
            if os.path.isfile(encodeFilename(ctx.tmpfilename)):
                ctx.resume_len = os.path.getsize(encodeFilename(ctx.tmpfilename))

        count = 0
        retries = self.params.get('retries', 0)

        class SucceedDownload(Exception):
            pass

        class RetryDownload(Exception):
            def __init__(self, source_error):
                self.source_error = source_error

        def establish_connection():
            if ctx.resume_len != 0:
                self.report_resuming_byte(ctx.resume_len)
                request.add_header('Range', 'bytes=%d-' % ctx.resume_len)
                ctx.open_mode = 'ab'
            # Establish connection
            try:
                ctx.data = self.ydl.urlopen(request)
                # When trying to resume, Content-Range HTTP header of response has to be checked
                # to match the value of requested Range HTTP header. This is due to a webservers
                # that don't support resuming and serve a whole file with no Content-Range
                # set in response despite of requested Range (see
                # https://github.com/rg3/youtube-dl/issues/6057#issuecomment-126129799)
                if ctx.resume_len > 0:
                    content_range = ctx.data.headers.get('Content-Range')
                    if content_range:
                        content_range_m = re.search(r'bytes (\d+)-', content_range)
                        # Content-Range is present and matches requested Range, resume is possible
                        if content_range_m and ctx.resume_len == int(content_range_m.group(1)):
                            return
                    # Content-Range is either not present or invalid. Assuming remote webserver is
                    # trying to send the whole file, resume is not possible, so wiping the local file
                    # and performing entire redownload
                    self.report_unable_to_resume()
                    ctx.resume_len = 0
                    ctx.open_mode = 'wb'
                return
            except (compat_urllib_error.HTTPError, ) as err:
                if (err.code < 500 or err.code >= 600) and err.code != 416:
                    # Unexpected HTTP error
                    raise
                elif err.code == 416:
                    # Unable to resume (requested range not satisfiable)
                    try:
                        # Open the connection again without the range header
                        ctx.data = self.ydl.urlopen(basic_request)
                        content_length = ctx.data.info()['Content-Length']
                    except (compat_urllib_error.HTTPError, ) as err:
                        if err.code < 500 or err.code >= 600:
                            raise
                    else:
                        # Examine the reported length
                        if (content_length is not None and
                                (ctx.resume_len - 100 < int(content_length) < ctx.resume_len + 100)):
                            # The file had already been fully downloaded.
                            # Explanation to the above condition: in issue #175 it was revealed that
                            # YouTube sometimes adds or removes a few bytes from the end of the file,
                            # changing the file size slightly and causing problems for some users. So
                            # I decided to implement a suggested change and consider the file
                            # completely downloaded if the file size differs less than 100 bytes from
                            # the one in the hard drive.
                            self.report_file_already_downloaded(ctx.filename)
                            self.try_rename(ctx.tmpfilename, ctx.filename)
                            self._hook_progress({
                                'filename': ctx.filename,
                                'status': 'finished',
                                'downloaded_bytes': ctx.resume_len,
                                'total_bytes': ctx.resume_len,
                            })
                            raise SucceedDownload()
                        else:
                            # The length does not match, we start the download over
                            self.report_unable_to_resume()
                            ctx.resume_len = 0
                            ctx.open_mode = 'wb'
                            return
                raise RetryDownload(err)
            except socket.error as err:
                if err.errno != errno.ECONNRESET:
                    # Connection reset is no problem, just retry
                    raise
                raise RetryDownload(err)

        def download():
            data_len = ctx.data.info().get('Content-length', None)

            # Range HTTP header may be ignored/unsupported by a webserver
            # (e.g. extractor/scivee.py, extractor/bambuser.py).
            # However, for a test we still would like to download just a piece of a file.
            # To achieve this we limit data_len to _TEST_FILE_SIZE and manually control
            # block size when downloading a file.
            if is_test and (data_len is None or int(data_len) > self._TEST_FILE_SIZE):
                data_len = self._TEST_FILE_SIZE

            if data_len is not None:
                data_len = int(data_len) + ctx.resume_len
                min_data_len = self.params.get('min_filesize')
                max_data_len = self.params.get('max_filesize')
                if min_data_len is not None and data_len < min_data_len:
                    self.to_screen('\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
                    return False
                if max_data_len is not None and data_len > max_data_len:
                    self.to_screen('\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
                    return False

            byte_counter = 0 + ctx.resume_len
            block_size = self.params.get('buffersize', 1024)
            start = time.time()

            # measure time over whole while-loop, so slow_down() and best_block_size() work together properly
            now = None  # needed for slow_down() in the first loop run
            before = start  # start measuring

            def retry(e):
                if ctx.tmpfilename != '-':
                    ctx.stream.close()
                ctx.stream = None
                ctx.resume_len = os.path.getsize(encodeFilename(ctx.tmpfilename))
                raise RetryDownload(e)

            while True:
                try:
                    # Download and write
                    data_block = ctx.data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
                # socket.timeout is a subclass of socket.error but may not have
                # errno set
                except socket.timeout as e:
                    retry(e)
                except socket.error as e:
                    if e.errno not in (errno.ECONNRESET, errno.ETIMEDOUT):
                        raise
                    retry(e)

                byte_counter += len(data_block)

                # exit loop when download is finished
                if len(data_block) == 0:
                    break

                # Open destination file just in time
                if ctx.stream is None:
                    try:
                        ctx.stream, ctx.tmpfilename = sanitize_open(
                            ctx.tmpfilename, ctx.open_mode)
                        assert ctx.stream is not None
                        ctx.filename = self.undo_temp_name(ctx.tmpfilename)
                        self.report_destination(ctx.filename)
                    except (OSError, IOError) as err:
                        self.report_error('unable to open for writing: %s' % str(err))
                        return False

                    if self.params.get('xattr_set_filesize', False) and data_len is not None:
                        try:
                            write_xattr(ctx.tmpfilename, 'user.ytdl.filesize', str(data_len).encode('utf-8'))
                        except (XAttrUnavailableError, XAttrMetadataError) as err:
                            self.report_error('unable to set filesize xattr: %s' % str(err))

                try:
                    ctx.stream.write(data_block)
                except (IOError, OSError) as err:
                    self.to_stderr('\n')
                    self.report_error('unable to write data: %s' % str(err))
                    return False

                # Apply rate limit
                self.slow_down(start, now, byte_counter - ctx.resume_len)

                # end measuring of one loop run
                now = time.time()
                after = now

                # Adjust block size
                if not self.params.get('noresizebuffer', False):
                    block_size = self.best_block_size(after - before, len(data_block))

                before = after

                # Progress message
                speed = self.calc_speed(start, now, byte_counter - ctx.resume_len)
                if data_len is None:
                    eta = None
                else:
                    eta = self.calc_eta(start, time.time(), data_len - ctx.resume_len, byte_counter - ctx.resume_len)

                self._hook_progress({
                    'status': 'downloading',
                    'downloaded_bytes': byte_counter,
                    'total_bytes': data_len,
                    'tmpfilename': ctx.tmpfilename,
                    'filename': ctx.filename,
                    'eta': eta,
                    'speed': speed,
                    'elapsed': now - start,
                })

                if is_test and byte_counter == data_len:
                    break

            if ctx.stream is None:
                self.to_stderr('\n')
                self.report_error('Did not get any data blocks')
                return False
            if ctx.tmpfilename != '-':
                ctx.stream.close()

            if data_len is not None and byte_counter != data_len:
                err = ContentTooShortError(byte_counter, int(data_len))
                if count <= retries:
                    retry(err)
                raise err

            self.try_rename(ctx.tmpfilename, ctx.filename)

            # Update file modification time
            if self.params.get('updatetime', True):
                info_dict['filetime'] = self.try_utime(ctx.filename, ctx.data.info().get('last-modified', None))

            self._hook_progress({
                'downloaded_bytes': byte_counter,
                'total_bytes': byte_counter,
                'filename': ctx.filename,
                'status': 'finished',
                'elapsed': time.time() - start,
            })

            return True

        while count <= retries:
            try:
                establish_connection()
                download()
                return True
            except RetryDownload as e:
                count += 1
                if count <= retries:
                    self.report_retry(e.source_error, count, retries)
                continue
            except SucceedDownload:
                return True

        self.report_error('giving up after %s retries' % retries)
        return False