Coverage for youtube_dl.FileDownloader : 57%

#!/usr/bin/env python 

# -*- coding: utf-8 -*- 

from __future__ import absolute_import 

import math 

import io 

import os 

import re 

import socket 

import subprocess 

import sys 

import time 

import traceback 

if os.name == 'nt': 

    import ctypes 

from .utils import * 

class FileDownloader(object): 

    """File Downloader class. 

    File downloader objects are the ones responsible of downloading the 

    actual video file and writing it to disk if the user has requested 

    it, among some other tasks. In most cases there should be one per 

    program. As, given a video URL, the downloader doesn't know how to 

    extract all the needed information, task that InfoExtractors do, it 

    has to pass the URL to one of them. 

    For this, file downloader objects have a method that allows 

    InfoExtractors to be registered in a given order. When it is passed 

    a URL, the file downloader handles it to the first InfoExtractor it 

    finds that reports being able to handle it. The InfoExtractor extracts 

    all the information about the video or videos the URL refers to, and 

    asks the FileDownloader to process the video information, possibly 

    downloading the video. 

    File downloaders accept a lot of parameters. In order not to saturate 

    the object constructor with arguments, it receives a dictionary of 

    options instead. These options are available through the params 

    attribute for the InfoExtractors to use. The FileDownloader also 

    registers itself as the downloader in charge for the InfoExtractors 

    that are added to it, so this is a "mutual registration". 

    Available options: 

    username:          Username for authentication purposes. 

    password:          Password for authentication purposes. 

    usenetrc:          Use netrc for authentication instead. 

    quiet:             Do not print messages to stdout. 

    forceurl:          Force printing final URL. 

    forcetitle:        Force printing title. 

    forcethumbnail:    Force printing thumbnail URL. 

    forcedescription:  Force printing description. 

    forcefilename:     Force printing final filename. 

    simulate:          Do not download the video files. 

    format:            Video format code. 

    format_limit:      Highest quality format to try. 

    outtmpl:           Template for output names. 

    restrictfilenames: Do not allow "&" and spaces in file names 

    ignoreerrors:      Do not stop on download errors. 

    ratelimit:         Download speed limit, in bytes/sec. 

    nooverwrites:      Prevent overwriting files. 

    retries:           Number of times to retry for HTTP error 5xx 

    buffersize:        Size of download buffer in bytes. 

    noresizebuffer:    Do not automatically resize the download buffer. 

    continuedl:        Try to continue downloads if possible. 

    noprogress:        Do not print the progress bar. 

    playliststart:     Playlist item to start at. 

    playlistend:       Playlist item to end at. 

    matchtitle:        Download only matching titles. 

    rejecttitle:       Reject downloads for matching titles. 

    logtostderr:       Log messages to stderr instead of stdout. 

    consoletitle:      Display progress in console window's titlebar. 

    nopart:            Do not use temporary .part files. 

    updatetime:        Use the Last-modified header to set output file timestamps. 

    writedescription:  Write the video description to a .description file 

    writeinfojson:     Write the video description to a .info.json file 

    writesubtitles:    Write the video subtitles to a .srt file 

    subtitleslang:     Language of the subtitles to download 

    test:              Download only first bytes to test the downloader. 

    """ 

    params = None 

    _ies = [] 

    _pps = [] 

    _download_retcode = None 

    _num_downloads = None 

    _screen_file = None 

    def __init__(self, params): 

        """Create a FileDownloader object with the given options.""" 

        self._ies = [] 

        self._pps = [] 

        self._download_retcode = 0 

        self._num_downloads = 0 

        self._screen_file = [sys.stdout, sys.stderr][params.get('logtostderr', False)] 

        self.params = params 

        if '%(stitle)s' in self.params['outtmpl']: 

            self.to_stderr(u'WARNING: %(stitle)s is deprecated. Use the %(title)s and the --restrict-filenames flag(which also secures %(uploader)s et al) instead.') 

    @staticmethod 

    def format_bytes(bytes): 

        if bytes is None: 

            return 'N/A' 

        if type(bytes) is str: 

            bytes = float(bytes) 

        if bytes == 0.0: 

            exponent = 0 

        else: 

            exponent = int(math.log(bytes, 1024.0)) 

        suffix = 'bkMGTPEZY'[exponent] 

        converted = float(bytes) / float(1024 ** exponent) 

        return '%.2f%s' % (converted, suffix) 

    @staticmethod 

    def calc_percent(byte_counter, data_len): 

        if data_len is None: 

            return '---.-%' 

        return '%6s' % ('%3.1f%%' % (float(byte_counter) / float(data_len) * 100.0)) 

    @staticmethod 

    def calc_eta(start, now, total, current): 

        if total is None: 

            return '--:--' 

        dif = now - start 

        if current == 0 or dif < 0.001: # One millisecond 

            return '--:--' 

        rate = float(current) / dif 

        eta = int((float(total) - float(current)) / rate) 

        (eta_mins, eta_secs) = divmod(eta, 60) 

        if eta_mins > 99: 

            return '--:--' 

        return '%02d:%02d' % (eta_mins, eta_secs) 

    @staticmethod 

    def calc_speed(start, now, bytes): 

        dif = now - start 

        if bytes == 0 or dif < 0.001: # One millisecond 

            return '%10s' % '---b/s' 

        return '%10s' % ('%s/s' % FileDownloader.format_bytes(float(bytes) / dif)) 

    @staticmethod 

    def best_block_size(elapsed_time, bytes): 

        new_min = max(bytes / 2.0, 1.0) 

        new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB 

        if elapsed_time < 0.001: 

            return int(new_max) 

        rate = bytes / elapsed_time 

        if rate > new_max: 

            return int(new_max) 

        if rate < new_min: 

            return int(new_min) 

        return int(rate) 

    @staticmethod 

    def parse_bytes(bytestr): 

        """Parse a string indicating a byte quantity into an integer.""" 

        matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr) 

        if matchobj is None: 

            return None 

        number = float(matchobj.group(1)) 

        multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower()) 

        return int(round(number * multiplier)) 

    def add_info_extractor(self, ie): 

        """Add an InfoExtractor object to the end of the list.""" 

        self._ies.append(ie) 

        ie.set_downloader(self) 

    def add_post_processor(self, pp): 

        """Add a PostProcessor object to the end of the chain.""" 

        self._pps.append(pp) 

        pp.set_downloader(self) 

    def to_screen(self, message, skip_eol=False): 

        """Print message to stdout if not in quiet mode.""" 

        assert type(message) == type(u'') 

        if not self.params.get('quiet', False): 

            terminator = [u'\n', u''][skip_eol] 

            output = message + terminator 

            if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr 

                output = output.encode(preferredencoding(), 'ignore') 

            self._screen_file.write(output) 

            self._screen_file.flush() 

    def to_stderr(self, message): 

        """Print message to stderr.""" 

        assert type(message) == type(u'') 

        output = message + u'\n' 

        if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr 

            output = output.encode(preferredencoding()) 

        sys.stderr.write(output) 

    def to_cons_title(self, message): 

        """Set console/terminal window title to message.""" 

        if not self.params.get('consoletitle', False): 

            return 

        if os.name == 'nt' and ctypes.windll.kernel32.GetConsoleWindow(): 

            # c_wchar_p() might not be necessary if `message` is 

            # already of type unicode() 

            ctypes.windll.kernel32.SetConsoleTitleW(ctypes.c_wchar_p(message)) 

        elif 'TERM' in os.environ: 

            sys.stderr.write('\033]0;%s\007' % message.encode(preferredencoding())) 

    def fixed_template(self): 

        """Checks if the output template is fixed.""" 

        return (re.search(u'(?u)%\\(.+?\\)s', self.params['outtmpl']) is None) 

    def trouble(self, message=None, tb=None): 

        """Determine action to take when a download problem appears. 

        Depending on if the downloader has been configured to ignore 

        download errors or not, this method may throw an exception or 

        not when errors are found, after printing the message. 

        """ 

        if message is not None: 

            self.to_stderr(message) 

        if self.params.get('verbose'): 

            if tb is None: 

                tb = u''.join(traceback.format_list(traceback.extract_stack())) 

            self.to_stderr(tb) 

        if not self.params.get('ignoreerrors', False): 

            raise DownloadError(message) 

        self._download_retcode = 1 

    def slow_down(self, start_time, byte_counter): 

        """Sleep if the download speed is over the rate limit.""" 

        rate_limit = self.params.get('ratelimit', None) 

        if rate_limit is None or byte_counter == 0: 

            return 

        now = time.time() 

        elapsed = now - start_time 

        if elapsed <= 0.0: 

            return 

        speed = float(byte_counter) / elapsed 

        if speed > rate_limit: 

            time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit) 

    def temp_name(self, filename): 

        """Returns a temporary filename for the given filename.""" 

        if self.params.get('nopart', False) or filename == u'-' or \ 

                (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))): 

            return filename 

        return filename + u'.part' 

    def undo_temp_name(self, filename): 

        if filename.endswith(u'.part'): 

            return filename[:-len(u'.part')] 

        return filename 

    def try_rename(self, old_filename, new_filename): 

        try: 

            if old_filename == new_filename: 

                return 

            os.rename(encodeFilename(old_filename), encodeFilename(new_filename)) 

        except (IOError, OSError) as err: 

            self.trouble(u'ERROR: unable to rename file') 

    def try_utime(self, filename, last_modified_hdr): 

        """Try to set the last-modified time of the given file.""" 

        if last_modified_hdr is None: 

            return 

        if not os.path.isfile(encodeFilename(filename)): 

            return 

        timestr = last_modified_hdr 

        if timestr is None: 

            return 

        filetime = timeconvert(timestr) 

        if filetime is None: 

            return filetime 

        try: 

            os.utime(filename, (time.time(), filetime)) 

        except: 

            pass 

        return filetime 

    def report_writedescription(self, descfn): 

        """ Report that the description file is being written """ 

        self.to_screen(u'[info] Writing video description to: ' + descfn) 

    def report_writesubtitles(self, srtfn): 

        """ Report that the subtitles file is being written """ 

        self.to_screen(u'[info] Writing video subtitles to: ' + srtfn) 

    def report_writeinfojson(self, infofn): 

        """ Report that the metadata file has been written """ 

        self.to_screen(u'[info] Video description metadata as JSON to: ' + infofn) 

    def report_destination(self, filename): 

        """Report destination filename.""" 

        self.to_screen(u'[download] Destination: ' + filename) 

    def report_progress(self, percent_str, data_len_str, speed_str, eta_str): 

        """Report download progress.""" 

        if self.params.get('noprogress', False): 

            return 

        self.to_screen(u'\r[download] %s of %s at %s ETA %s' % 

                (percent_str, data_len_str, speed_str, eta_str), skip_eol=True) 

        self.to_cons_title(u'youtube-dl - %s of %s at %s ETA %s' % 

                (percent_str.strip(), data_len_str.strip(), speed_str.strip(), eta_str.strip())) 

    def report_resuming_byte(self, resume_len): 

        """Report attempt to resume at given byte.""" 

        self.to_screen(u'[download] Resuming download at byte %s' % resume_len) 

    def report_retry(self, count, retries): 

        """Report retry in case of HTTP error 5xx""" 

        self.to_screen(u'[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries)) 

    def report_file_already_downloaded(self, file_name): 

        """Report file has already been fully downloaded.""" 

        try: 

            self.to_screen(u'[download] %s has already been downloaded' % file_name) 

        except (UnicodeEncodeError) as err: 

            self.to_screen(u'[download] The file has already been downloaded') 

    def report_unable_to_resume(self): 

        """Report it was impossible to resume download.""" 

        self.to_screen(u'[download] Unable to resume') 

    def report_finish(self): 

        """Report download finished.""" 

        if self.params.get('noprogress', False): 

            self.to_screen(u'[download] Download completed') 

        else: 

            self.to_screen(u'') 

    def increment_downloads(self): 

        """Increment the ordinal that assigns a number to each file.""" 

        self._num_downloads += 1 

    def prepare_filename(self, info_dict): 

        """Generate the output filename.""" 

        try: 

            template_dict = dict(info_dict) 

            template_dict['epoch'] = int(time.time()) 

            template_dict['autonumber'] = u'%05d' % self._num_downloads 

            sanitize = lambda k,v: sanitize_filename( 

                u'NA' if v is None else compat_str(v), 

                restricted=self.params.get('restrictfilenames'), 

                is_id=(k==u'id')) 

            template_dict = dict((k, sanitize(k, v)) for k,v in template_dict.items()) 

            filename = self.params['outtmpl'] % template_dict 

            return filename 

        except (ValueError, KeyError) as err: 

            self.trouble(u'ERROR: invalid system charset or erroneous output template') 

            return None 

    def _match_entry(self, info_dict): 

        """ Returns None iff the file should be downloaded """ 

        title = info_dict['title'] 

        matchtitle = self.params.get('matchtitle', False) 

        if matchtitle: 

            matchtitle = matchtitle.decode('utf8') 

            if not re.search(matchtitle, title, re.IGNORECASE): 

                return u'[download] "' + title + '" title did not match pattern "' + matchtitle + '"' 

        rejecttitle = self.params.get('rejecttitle', False) 

        if rejecttitle: 

            rejecttitle = rejecttitle.decode('utf8') 

            if re.search(rejecttitle, title, re.IGNORECASE): 

                return u'"' + title + '" title matched reject pattern "' + rejecttitle + '"' 

        return None 

    def process_info(self, info_dict): 

        """Process a single dictionary returned by an InfoExtractor.""" 

        # Keep for backwards compatibility 

        info_dict['stitle'] = info_dict['title'] 

        if not 'format' in info_dict: 

            info_dict['format'] = info_dict['ext'] 

        reason = self._match_entry(info_dict) 

        if reason is not None: 

            self.to_screen(u'[download] ' + reason) 

            return 

        max_downloads = self.params.get('max_downloads') 

        if max_downloads is not None: 

            if self._num_downloads > int(max_downloads): 

                raise MaxDownloadsReached() 

        filename = self.prepare_filename(info_dict) 

        # Forced printings 

        if self.params.get('forcetitle', False): 

            compat_print(info_dict['title']) 

        if self.params.get('forceurl', False): 

            compat_print(info_dict['url']) 

        if self.params.get('forcethumbnail', False) and 'thumbnail' in info_dict: 

            compat_print(info_dict['thumbnail']) 

        if self.params.get('forcedescription', False) and 'description' in info_dict: 

            compat_print(info_dict['description']) 

        if self.params.get('forcefilename', False) and filename is not None: 

            compat_print(filename) 

        if self.params.get('forceformat', False): 

            compat_print(info_dict['format']) 

        # Do nothing else if in simulate mode 

        if self.params.get('simulate', False): 

            return 

        if filename is None: 

            return 

        try: 

            dn = os.path.dirname(encodeFilename(filename)) 

            if dn != '' and not os.path.exists(dn): # dn is already encoded 

                os.makedirs(dn) 

        except (OSError, IOError) as err: 

            self.trouble(u'ERROR: unable to create directory ' + compat_str(err)) 

            return 

        if self.params.get('writedescription', False): 

            try: 

                descfn = filename + u'.description' 

                self.report_writedescription(descfn) 

                with io.open(encodeFilename(descfn), 'w', encoding='utf-8') as descfile: 

                    descfile.write(info_dict['description']) 

            except (OSError, IOError): 

                self.trouble(u'ERROR: Cannot write description file ' + descfn) 

                return 

        if self.params.get('writesubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']: 

            # subtitles download errors are already managed as troubles in relevant IE 

            # that way it will silently go on when used with unsupporting IE 

            try: 

                srtfn = filename.rsplit('.', 1)[0] + u'.srt' 

                self.report_writesubtitles(srtfn) 

                with io.open(encodeFilename(srtfn), 'w', encoding='utf-8') as srtfile: 

                    srtfile.write(info_dict['subtitles']) 

            except (OSError, IOError): 

                self.trouble(u'ERROR: Cannot write subtitles file ' + descfn) 

                return 

        if self.params.get('writeinfojson', False): 

            infofn = filename + u'.info.json' 

            self.report_writeinfojson(infofn) 

            try: 

                json_info_dict = dict((k, v) for k,v in info_dict.items() if not k in ['urlhandle']) 

                write_json_file(json_info_dict, encodeFilename(infofn)) 

            except (OSError, IOError): 

                self.trouble(u'ERROR: Cannot write metadata to JSON file ' + infofn) 

                return 

        if not self.params.get('skip_download', False): 

            if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(filename)): 

                success = True 

            else: 

                try: 

                    success = self._do_download(filename, info_dict) 

                except (OSError, IOError) as err: 

                    raise UnavailableVideoError() 

                except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err: 

                    self.trouble(u'ERROR: unable to download video data: %s' % str(err)) 

                    return 

                except (ContentTooShortError, ) as err: 

                    self.trouble(u'ERROR: content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded)) 

                    return 

            if success: 

                try: 

                    self.post_process(filename, info_dict) 

                except (PostProcessingError) as err: 

                    self.trouble(u'ERROR: postprocessing: %s' % str(err)) 

                    return 

    def download(self, url_list): 

        """Download a given list of URLs.""" 

        if len(url_list) > 1 and self.fixed_template(): 

            raise SameFileError(self.params['outtmpl']) 

        for url in url_list: 

            suitable_found = False 

            for ie in self._ies: 

                # Go to next InfoExtractor if not suitable 

                if not ie.suitable(url): 

                    continue 

                # Warn if the _WORKING attribute is False 

                if not ie.working(): 

                    self.to_stderr(u'WARNING: the program functionality for this site has been marked as broken, ' 

                                   u'and will probably not work. If you want to go on, use the -i option.') 

                # Suitable InfoExtractor found 

                suitable_found = True 

                # Extract information from URL and process it 

                try: 

                    videos = ie.extract(url) 

                except ExtractorError as de: # An error we somewhat expected 

                    self.trouble(u'ERROR: ' + compat_str(de), compat_str(u''.join(traceback.format_tb(de.traceback)))) 

                    break 

                except Exception as e: 

                    if self.params.get('ignoreerrors', False): 

                        self.trouble(u'ERROR: ' + compat_str(e), tb=compat_str(traceback.format_exc())) 

                        break 

                    else: 

                        raise 

                if len(videos or []) > 1 and self.fixed_template(): 

                    raise SameFileError(self.params['outtmpl']) 

                for video in videos or []: 

                    video['extractor'] = ie.IE_NAME 

                    try: 

                        self.increment_downloads() 

                        self.process_info(video) 

                    except UnavailableVideoError: 

                        self.trouble(u'\nERROR: unable to download video') 

                # Suitable InfoExtractor had been found; go to next URL 

                break 

            if not suitable_found: 

                self.trouble(u'ERROR: no suitable InfoExtractor: %s' % url) 

        return self._download_retcode 

    def post_process(self, filename, ie_info): 

        """Run the postprocessing chain on the given file.""" 

        info = dict(ie_info) 

        info['filepath'] = filename 

        for pp in self._pps: 

            info = pp.run(info) 

            if info is None: 

                break 

    def _download_with_rtmpdump(self, filename, url, player_url): 

        self.report_destination(filename) 

        tmpfilename = self.temp_name(filename) 

        # Check for rtmpdump first 

        try: 

            subprocess.call(['rtmpdump', '-h'], stdout=(file(os.path.devnull, 'w')), stderr=subprocess.STDOUT) 

        except (OSError, IOError): 

            self.trouble(u'ERROR: RTMP download detected but "rtmpdump" could not be run') 

            return False 

        # Download using rtmpdump. rtmpdump returns exit code 2 when 

        # the connection was interrumpted and resuming appears to be 

        # possible. This is part of rtmpdump's normal usage, AFAIK. 

        basic_args = ['rtmpdump', '-q'] + [[], ['-W', player_url]][player_url is not None] + ['-r', url, '-o', tmpfilename] 

        args = basic_args + [[], ['-e', '-k', '1']][self.params.get('continuedl', False)] 

        if self.params.get('verbose', False): 

            try: 

                import pipes 

                shell_quote = lambda args: ' '.join(map(pipes.quote, args)) 

            except ImportError: 

                shell_quote = repr 

            self.to_screen(u'[debug] rtmpdump command line: ' + shell_quote(args)) 

        retval = subprocess.call(args) 

        while retval == 2 or retval == 1: 

            prevsize = os.path.getsize(encodeFilename(tmpfilename)) 

            self.to_screen(u'\r[rtmpdump] %s bytes' % prevsize, skip_eol=True) 

            time.sleep(5.0) # This seems to be needed 

            retval = subprocess.call(basic_args + ['-e'] + [[], ['-k', '1']][retval == 1]) 

            cursize = os.path.getsize(encodeFilename(tmpfilename)) 

            if prevsize == cursize and retval == 1: 

                break 

             # Some rtmp streams seem abort after ~ 99.8%. Don't complain for those 

            if prevsize == cursize and retval == 2 and cursize > 1024: 

                self.to_screen(u'\r[rtmpdump] Could not download the whole video. This can happen for some advertisements.') 

                retval = 0 

                break 

        if retval == 0: 

            self.to_screen(u'\r[rtmpdump] %s bytes' % os.path.getsize(encodeFilename(tmpfilename))) 

            self.try_rename(tmpfilename, filename) 

            return True 

        else: 

            self.trouble(u'\nERROR: rtmpdump exited with code %d' % retval) 

            return False 

    def _do_download(self, filename, info_dict): 

        url = info_dict['url'] 

        player_url = info_dict.get('player_url', None) 

        # Check file already present 

        if self.params.get('continuedl', False) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False): 

            self.report_file_already_downloaded(filename) 

            return True 

        # Attempt to download using rtmpdump 

        if url.startswith('rtmp'): 

            return self._download_with_rtmpdump(filename, url, player_url) 

        tmpfilename = self.temp_name(filename) 

        stream = None 

        # Do not include the Accept-Encoding header 

        headers = {'Youtubedl-no-compression': 'True'} 

        basic_request = compat_urllib_request.Request(url, None, headers) 

        request = compat_urllib_request.Request(url, None, headers) 

        if self.params.get('test', False): 

            request.add_header('Range','bytes=0-10240') 

        # Establish possible resume length 

        if os.path.isfile(encodeFilename(tmpfilename)): 

            resume_len = os.path.getsize(encodeFilename(tmpfilename)) 

        else: 

            resume_len = 0 

        open_mode = 'wb' 

        if resume_len != 0: 

            if self.params.get('continuedl', False): 

                self.report_resuming_byte(resume_len) 

                request.add_header('Range','bytes=%d-' % resume_len) 

                open_mode = 'ab' 

            else: 

                resume_len = 0 

        count = 0 

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

        while count <= retries: 

            # Establish connection 

            try: 

                if count == 0 and 'urlhandle' in info_dict: 

                    data = info_dict['urlhandle'] 

                data = compat_urllib_request.urlopen(request) 

                break 

            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 

                        data = compat_urllib_request.urlopen(basic_request) 

                        content_length = 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 

                                (resume_len - 100 < int(content_length) < 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(filename) 

                            self.try_rename(tmpfilename, filename) 

                            return True 

                        else: 

                            # The length does not match, we start the download over 

                            self.report_unable_to_resume() 

                            open_mode = 'wb' 

                            break 

            # Retry 

            count += 1 

            if count <= retries: 

                self.report_retry(count, retries) 

        if count > retries: 

            self.trouble(u'ERROR: giving up after %s retries' % retries) 

            return False 

        data_len = data.info().get('Content-length', None) 

        if data_len is not None: 

            data_len = int(data_len) + resume_len 

        data_len_str = self.format_bytes(data_len) 

        byte_counter = 0 + resume_len 

        block_size = self.params.get('buffersize', 1024) 

        start = time.time() 

        while True: 

            # Download and write 

            before = time.time() 

            data_block = data.read(block_size) 

            after = time.time() 

            if len(data_block) == 0: 

                break 

            byte_counter += len(data_block) 

            # Open file just in time 

            if stream is None: 

                try: 

                    (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode) 

                    assert stream is not None 

                    filename = self.undo_temp_name(tmpfilename) 

                    self.report_destination(filename) 

                except (OSError, IOError) as err: 

                    self.trouble(u'ERROR: unable to open for writing: %s' % str(err)) 

                    return False 

            try: 

                stream.write(data_block) 

            except (IOError, OSError) as err: 

                self.trouble(u'\nERROR: unable to write data: %s' % str(err)) 

                return False 

            if not self.params.get('noresizebuffer', False): 

                block_size = self.best_block_size(after - before, len(data_block)) 

            # Progress message 

            speed_str = self.calc_speed(start, time.time(), byte_counter - resume_len) 

            if data_len is None: 

                self.report_progress('Unknown %', data_len_str, speed_str, 'Unknown ETA') 

            else: 

                percent_str = self.calc_percent(byte_counter, data_len) 

                eta_str = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len) 

                self.report_progress(percent_str, data_len_str, speed_str, eta_str) 

            # Apply rate limit 

            self.slow_down(start, byte_counter - resume_len) 

        if stream is None: 

            self.trouble(u'\nERROR: Did not get any data blocks') 

            return False 

        stream.close() 

        self.report_finish() 

        if data_len is not None and byte_counter != data_len: 

            raise ContentTooShortError(byte_counter, int(data_len)) 

        self.try_rename(tmpfilename, filename) 

        # Update file modification time 

        if self.params.get('updatetime', True): 

            info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None)) 

        return True