author | Nicolas Dumazet <nicdumz.commits@gmail.com> |
Sun, 24 May 2009 18:43:05 +0900 | |
changeset 8599 | 1f706b1b62f3 |
parent 8378 | 59acf64995d2 |
child 9034 | 8429062de8d3 |
permissions | -rw-r--r-- |
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# This library is free software; you can redistribute it and/or |
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# modify it under the terms of the GNU Lesser General Public |
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# License as published by the Free Software Foundation; either |
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# version 2.1 of the License, or (at your option) any later version. |
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# |
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# This library is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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# Lesser General Public License for more details. |
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# |
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# You should have received a copy of the GNU Lesser General Public |
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# License along with this library; if not, write to the |
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# Free Software Foundation, Inc., |
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# 59 Temple Place, Suite 330, |
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# Boston, MA 02111-1307 USA |
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# This file is part of urlgrabber, a high-level cross-protocol url-grabber |
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# Copyright 2002-2004 Michael D. Stenner, Ryan Tomayko |
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# $Id: byterange.py,v 1.9 2005/02/14 21:55:07 mstenner Exp $ |
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import os |
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import stat |
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import urllib |
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import urllib2 |
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import email.Utils |
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try: |
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from cStringIO import StringIO |
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except ImportError, msg: |
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from StringIO import StringIO |
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class RangeError(IOError): |
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"""Error raised when an unsatisfiable range is requested.""" |
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pass |
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class HTTPRangeHandler(urllib2.BaseHandler): |
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"""Handler that enables HTTP Range headers. |
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This was extremely simple. The Range header is a HTTP feature to |
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begin with so all this class does is tell urllib2 that the |
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"206 Partial Content" reponse from the HTTP server is what we |
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expected. |
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Example: |
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import urllib2 |
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import byterange |
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range_handler = range.HTTPRangeHandler() |
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opener = urllib2.build_opener(range_handler) |
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# install it |
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urllib2.install_opener(opener) |
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# create Request and set Range header |
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req = urllib2.Request('http://www.python.org/') |
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req.header['Range'] = 'bytes=30-50' |
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f = urllib2.urlopen(req) |
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""" |
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def http_error_206(self, req, fp, code, msg, hdrs): |
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# 206 Partial Content Response |
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r = urllib.addinfourl(fp, hdrs, req.get_full_url()) |
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r.code = code |
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r.msg = msg |
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return r |
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def http_error_416(self, req, fp, code, msg, hdrs): |
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# HTTP's Range Not Satisfiable error |
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raise RangeError('Requested Range Not Satisfiable') |
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class RangeableFileObject: |
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"""File object wrapper to enable raw range handling. |
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This was implemented primarilary for handling range |
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specifications for file:// urls. This object effectively makes |
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a file object look like it consists only of a range of bytes in |
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the stream. |
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Examples: |
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# expose 10 bytes, starting at byte position 20, from |
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# /etc/aliases. |
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>>> fo = RangeableFileObject(file('/etc/passwd', 'r'), (20,30)) |
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# seek seeks within the range (to position 23 in this case) |
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>>> fo.seek(3) |
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# tell tells where your at _within the range_ (position 3 in |
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# this case) |
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>>> fo.tell() |
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# read EOFs if an attempt is made to read past the last |
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# byte in the range. the following will return only 7 bytes. |
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>>> fo.read(30) |
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""" |
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def __init__(self, fo, rangetup): |
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"""Create a RangeableFileObject. |
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fo -- a file like object. only the read() method need be |
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supported but supporting an optimized seek() is |
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preferable. |
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rangetup -- a (firstbyte,lastbyte) tuple specifying the range |
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to work over. |
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The file object provided is assumed to be at byte offset 0. |
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""" |
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self.fo = fo |
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(self.firstbyte, self.lastbyte) = range_tuple_normalize(rangetup) |
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self.realpos = 0 |
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self._do_seek(self.firstbyte) |
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def __getattr__(self, name): |
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"""This effectively allows us to wrap at the instance level. |
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Any attribute not found in _this_ object will be searched for |
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in self.fo. This includes methods.""" |
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if hasattr(self.fo, name): |
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return getattr(self.fo, name) |
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raise AttributeError(name) |
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def tell(self): |
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"""Return the position within the range. |
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This is different from fo.seek in that position 0 is the |
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first byte position of the range tuple. For example, if |
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this object was created with a range tuple of (500,899), |
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tell() will return 0 when at byte position 500 of the file. |
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""" |
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return (self.realpos - self.firstbyte) |
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def seek(self, offset, whence=0): |
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"""Seek within the byte range. |
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Positioning is identical to that described under tell(). |
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""" |
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assert whence in (0, 1, 2) |
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if whence == 0: # absolute seek |
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realoffset = self.firstbyte + offset |
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elif whence == 1: # relative seek |
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realoffset = self.realpos + offset |
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elif whence == 2: # absolute from end of file |
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# XXX: are we raising the right Error here? |
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raise IOError('seek from end of file not supported.') |
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# do not allow seek past lastbyte in range |
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if self.lastbyte and (realoffset >= self.lastbyte): |
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realoffset = self.lastbyte |
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self._do_seek(realoffset - self.realpos) |
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def read(self, size=-1): |
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"""Read within the range. |
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This method will limit the size read based on the range. |
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""" |
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size = self._calc_read_size(size) |
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rslt = self.fo.read(size) |
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self.realpos += len(rslt) |
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return rslt |
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def readline(self, size=-1): |
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"""Read lines within the range. |
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This method will limit the size read based on the range. |
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""" |
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size = self._calc_read_size(size) |
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rslt = self.fo.readline(size) |
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self.realpos += len(rslt) |
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return rslt |
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def _calc_read_size(self, size): |
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"""Handles calculating the amount of data to read based on |
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the range. |
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""" |
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if self.lastbyte: |
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if size > -1: |
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if ((self.realpos + size) >= self.lastbyte): |
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size = (self.lastbyte - self.realpos) |
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else: |
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size = (self.lastbyte - self.realpos) |
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return size |
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def _do_seek(self, offset): |
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"""Seek based on whether wrapped object supports seek(). |
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offset is relative to the current position (self.realpos). |
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""" |
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assert offset >= 0 |
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if not hasattr(self.fo, 'seek'): |
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self._poor_mans_seek(offset) |
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else: |
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self.fo.seek(self.realpos + offset) |
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self.realpos += offset |
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def _poor_mans_seek(self, offset): |
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"""Seek by calling the wrapped file objects read() method. |
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This is used for file like objects that do not have native |
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seek support. The wrapped objects read() method is called |
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to manually seek to the desired position. |
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offset -- read this number of bytes from the wrapped |
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file object. |
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raise RangeError if we encounter EOF before reaching the |
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specified offset. |
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""" |
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pos = 0 |
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bufsize = 1024 |
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while pos < offset: |
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if (pos + bufsize) > offset: |
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bufsize = offset - pos |
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buf = self.fo.read(bufsize) |
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if len(buf) != bufsize: |
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raise RangeError('Requested Range Not Satisfiable') |
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pos += bufsize |
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|
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class FileRangeHandler(urllib2.FileHandler): |
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"""FileHandler subclass that adds Range support. |
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This class handles Range headers exactly like an HTTP |
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server would. |
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""" |
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def open_local_file(self, req): |
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import mimetypes |
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import mimetools |
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host = req.get_host() |
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file = req.get_selector() |
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localfile = urllib.url2pathname(file) |
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stats = os.stat(localfile) |
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size = stats[stat.ST_SIZE] |
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modified = email.Utils.formatdate(stats[stat.ST_MTIME]) |
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mtype = mimetypes.guess_type(file)[0] |
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if host: |
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host, port = urllib.splitport(host) |
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if port or socket.gethostbyname(host) not in self.get_names(): |
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raise urllib2.URLError('file not on local host') |
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fo = open(localfile,'rb') |
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brange = req.headers.get('Range', None) |
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brange = range_header_to_tuple(brange) |
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assert brange != () |
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if brange: |
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(fb, lb) = brange |
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if lb == '': |
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lb = size |
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if fb < 0 or fb > size or lb > size: |
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raise RangeError('Requested Range Not Satisfiable') |
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size = (lb - fb) |
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fo = RangeableFileObject(fo, (fb, lb)) |
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headers = mimetools.Message(StringIO( |
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'Content-Type: %s\nContent-Length: %d\nLast-Modified: %s\n' % |
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(mtype or 'text/plain', size, modified))) |
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return urllib.addinfourl(fo, headers, 'file:'+file) |
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239 |
|
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|
575 | 241 |
# FTP Range Support |
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# Unfortunately, a large amount of base FTP code had to be copied |
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# from urllib and urllib2 in order to insert the FTP REST command. |
575 | 244 |
# Code modifications for range support have been commented as |
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# follows: |
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# -- range support modifications start/end here |
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247 |
|
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from urllib import splitport, splituser, splitpasswd, splitattr, \ |
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249 |
unquote, addclosehook, addinfourl |
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250 |
import ftplib |
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251 |
import socket |
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import sys |
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import mimetypes |
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import mimetools |
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255 |
|
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class FTPRangeHandler(urllib2.FTPHandler): |
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257 |
def ftp_open(self, req): |
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host = req.get_host() |
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if not host: |
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raise IOError('ftp error', 'no host given') |
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host, port = splitport(host) |
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if port is None: |
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port = ftplib.FTP_PORT |
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264 |
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# username/password handling |
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user, host = splituser(host) |
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if user: |
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user, passwd = splitpasswd(user) |
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else: |
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passwd = None |
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host = unquote(host) |
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user = unquote(user or '') |
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passwd = unquote(passwd or '') |
575 | 274 |
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try: |
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host = socket.gethostbyname(host) |
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except socket.error, msg: |
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raise urllib2.URLError(msg) |
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path, attrs = splitattr(req.get_selector()) |
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dirs = path.split('/') |
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dirs = map(unquote, dirs) |
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dirs, file = dirs[:-1], dirs[-1] |
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if dirs and not dirs[0]: |
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dirs = dirs[1:] |
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try: |
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fw = self.connect_ftp(user, passwd, host, port, dirs) |
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type = file and 'I' or 'D' |
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for attr in attrs: |
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attr, value = splitattr(attr) |
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if attr.lower() == 'type' and \ |
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291 |
value in ('a', 'A', 'i', 'I', 'd', 'D'): |
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type = value.upper() |
575 | 293 |
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# -- range support modifications start here |
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rest = None |
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range_tup = range_header_to_tuple(req.headers.get('Range', None)) |
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assert range_tup != () |
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if range_tup: |
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(fb, lb) = range_tup |
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300 |
if fb > 0: |
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rest = fb |
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# -- range support modifications end here |
575 | 303 |
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fp, retrlen = fw.retrfile(file, type, rest) |
575 | 305 |
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# -- range support modifications start here |
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307 |
if range_tup: |
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(fb, lb) = range_tup |
575 | 309 |
if lb == '': |
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if retrlen is None or retrlen == 0: |
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raise RangeError('Requested Range Not Satisfiable due to unobtainable file length.') |
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lb = retrlen |
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retrlen = lb - fb |
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if retrlen < 0: |
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# beginning of range is larger than file |
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raise RangeError('Requested Range Not Satisfiable') |
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else: |
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retrlen = lb - fb |
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fp = RangeableFileObject(fp, (0, retrlen)) |
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# -- range support modifications end here |
575 | 321 |
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headers = "" |
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mtype = mimetypes.guess_type(req.get_full_url())[0] |
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if mtype: |
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headers += "Content-Type: %s\n" % mtype |
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326 |
if retrlen is not None and retrlen >= 0: |
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headers += "Content-Length: %d\n" % retrlen |
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sf = StringIO(headers) |
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headers = mimetools.Message(sf) |
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return addinfourl(fp, headers, req.get_full_url()) |
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331 |
except ftplib.all_errors, msg: |
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raise IOError('ftp error', msg), sys.exc_info()[2] |
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333 |
|
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334 |
def connect_ftp(self, user, passwd, host, port, dirs): |
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fw = ftpwrapper(user, passwd, host, port, dirs) |
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return fw |
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337 |
|
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class ftpwrapper(urllib.ftpwrapper): |
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339 |
# range support note: |
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340 |
# this ftpwrapper code is copied directly from |
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341 |
# urllib. The only enhancement is to add the rest |
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342 |
# argument and pass it on to ftp.ntransfercmd |
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343 |
def retrfile(self, file, type, rest=None): |
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344 |
self.endtransfer() |
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if type in ('d', 'D'): |
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346 |
cmd = 'TYPE A' |
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347 |
isdir = 1 |
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else: |
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cmd = 'TYPE ' + type |
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350 |
isdir = 0 |
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351 |
try: |
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352 |
self.ftp.voidcmd(cmd) |
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353 |
except ftplib.all_errors: |
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354 |
self.init() |
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355 |
self.ftp.voidcmd(cmd) |
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356 |
conn = None |
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357 |
if file and not isdir: |
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358 |
# Use nlst to see if the file exists at all |
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359 |
try: |
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360 |
self.ftp.nlst(file) |
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361 |
except ftplib.error_perm, reason: |
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362 |
raise IOError('ftp error', reason), sys.exc_info()[2] |
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363 |
# Restore the transfer mode! |
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364 |
self.ftp.voidcmd(cmd) |
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365 |
# Try to retrieve as a file |
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366 |
try: |
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367 |
cmd = 'RETR ' + file |
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368 |
conn = self.ftp.ntransfercmd(cmd, rest) |
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369 |
except ftplib.error_perm, reason: |
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370 |
if str(reason).startswith('501'): |
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371 |
# workaround for REST not supported error |
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372 |
fp, retrlen = self.retrfile(file, type) |
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373 |
fp = RangeableFileObject(fp, (rest,'')) |
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374 |
return (fp, retrlen) |
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375 |
elif not str(reason).startswith('550'): |
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376 |
raise IOError('ftp error', reason), sys.exc_info()[2] |
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377 |
if not conn: |
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378 |
# Set transfer mode to ASCII! |
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379 |
self.ftp.voidcmd('TYPE A') |
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380 |
# Try a directory listing |
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381 |
if file: |
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382 |
cmd = 'LIST ' + file |
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383 |
else: |
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384 |
cmd = 'LIST' |
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385 |
conn = self.ftp.ntransfercmd(cmd) |
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386 |
self.busy = 1 |
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387 |
# Pass back both a suitably decorated object and a retrieval length |
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388 |
return (addclosehook(conn[0].makefile('rb'), |
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389 |
self.endtransfer), conn[1]) |
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|
390 |
|
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391 |
|
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392 |
#################################################################### |
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393 |
# Range Tuple Functions |
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394 |
# XXX: These range tuple functions might go better in a class. |
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395 |
|
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396 |
_rangere = None |
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397 |
def range_header_to_tuple(range_header): |
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398 |
"""Get a (firstbyte,lastbyte) tuple from a Range header value. |
575 | 399 |
|
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400 |
Range headers have the form "bytes=<firstbyte>-<lastbyte>". This |
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401 |
function pulls the firstbyte and lastbyte values and returns |
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402 |
a (firstbyte,lastbyte) tuple. If lastbyte is not specified in |
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403 |
the header value, it is returned as an empty string in the |
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404 |
tuple. |
575 | 405 |
|
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406 |
Return None if range_header is None |
575 | 407 |
Return () if range_header does not conform to the range spec |
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408 |
pattern. |
575 | 409 |
|
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410 |
""" |
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411 |
global _rangere |
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412 |
if range_header is None: |
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413 |
return None |
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414 |
if _rangere is None: |
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415 |
import re |
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416 |
_rangere = re.compile(r'^bytes=(\d{1,})-(\d*)') |
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417 |
match = _rangere.match(range_header) |
575 | 418 |
if match: |
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419 |
tup = range_tuple_normalize(match.group(1, 2)) |
575 | 420 |
if tup and tup[1]: |
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421 |
tup = (tup[0], tup[1]+1) |
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422 |
return tup |
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423 |
return () |
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424 |
|
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425 |
def range_tuple_to_header(range_tup): |
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426 |
"""Convert a range tuple to a Range header value. |
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427 |
Return a string of the form "bytes=<firstbyte>-<lastbyte>" or None |
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428 |
if no range is needed. |
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""" |
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if range_tup is None: |
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return None |
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range_tup = range_tuple_normalize(range_tup) |
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if range_tup: |
575 | 434 |
if range_tup[1]: |
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range_tup = (range_tup[0], range_tup[1] - 1) |
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return 'bytes=%s-%s' % range_tup |
575 | 437 |
|
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def range_tuple_normalize(range_tup): |
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"""Normalize a (first_byte,last_byte) range tuple. |
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Return a tuple whose first element is guaranteed to be an int |
575 | 441 |
and whose second element will be '' (meaning: the last byte) or |
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an int. Finally, return None if the normalized tuple == (0,'') |
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as that is equivelant to retrieving the entire file. |
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""" |
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if range_tup is None: |
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return None |
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# handle first byte |
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fb = range_tup[0] |
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if fb in (None, ''): |
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fb = 0 |
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else: |
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fb = int(fb) |
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# handle last byte |
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try: |
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lb = range_tup[1] |
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except IndexError: |
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lb = '' |
575 | 458 |
else: |
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if lb is None: |
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lb = '' |
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elif lb != '': |
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lb = int(lb) |
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# check if range is over the entire file |
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if (fb, lb) == (0, ''): |
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return None |
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# check that the range is valid |
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if lb < fb: |
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raise RangeError('Invalid byte range: %s-%s' % (fb, lb)) |
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return (fb, lb) |