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- Committer: Robert Collins
- Date: 2005-10-02 21:51:29 UTC
- mfrom: (1396)
- mto: This revision was merged to the branch mainline in revision 1397.
- Revision ID: robertc@robertcollins.net-20051002215128-5686c7d24bf9bdb9
merge from martins newformat branch - brings in transport abstraction
- files added:
- bzrlib/clone.py
- bzrlib/store
- bzrlib/transport
- files removed:
- bzrlib/remotebranch.py
- files renamed:
- bzrlib/store.py => bzrlib/store/__init__.py
- bzrlib/weavestore.py => bzrlib/store/weave.py
- files modified:
- NEWS
added
removed
bzrlib/transport/http.py
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# Copyright (C) 2005 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program 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
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Implementation of Transport over http.
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"""
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from bzrlib.transport import Transport, register_transport
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from bzrlib.errors import (TransportNotPossible, NoSuchFile,
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NonRelativePath, TransportError)
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import os, errno
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from cStringIO import StringIO
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import urllib2
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import urlparse
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from bzrlib.errors import BzrError, BzrCheckError
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from bzrlib.branch import Branch
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from bzrlib.trace import mutter
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# velocitynet.com.au transparently proxies connections and thereby
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# breaks keep-alive -- sucks!
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def get_url(url):
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import urllib2
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mutter("get_url %s" % url)
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url_f = urllib2.urlopen(url)
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return url_f
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class HttpTransportError(TransportError):
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pass
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class HttpTransport(Transport):
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"""This is the transport agent for http:// access.
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TODO: Implement pipelined versions of all of the *_multi() functions.
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"""
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def __init__(self, base):
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"""Set the base path where files will be stored."""
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assert base.startswith('http://') or base.startswith('https://')
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super(HttpTransport, self).__init__(base)
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# In the future we might actually connect to the remote host
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# rather than using get_url
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# self._connection = None
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(self._proto, self._host,
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self._path, self._parameters,
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self._query, self._fragment) = urlparse.urlparse(self.base)
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def should_cache(self):
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"""Return True if the data pulled across should be cached locally.
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"""
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return True
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def clone(self, offset=None):
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"""Return a new HttpTransport with root at self.base + offset
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For now HttpTransport does not actually connect, so just return
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a new HttpTransport object.
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"""
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if offset is None:
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return HttpTransport(self.base)
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else:
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return HttpTransport(self.abspath(offset))
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def abspath(self, relpath):
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"""Return the full url to the given relative path.
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This can be supplied with a string or a list
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"""
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if isinstance(relpath, basestring):
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relpath = [relpath]
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basepath = self._path.split('/')
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if len(basepath) > 0 and basepath[-1] == '':
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basepath = basepath[:-1]
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for p in relpath:
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if p == '..':
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if len(basepath) < 0:
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# In most filesystems, a request for the parent
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# of root, just returns root.
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continue
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basepath.pop()
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elif p == '.':
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continue # No-op
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else:
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basepath.append(p)
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# Possibly, we could use urlparse.urljoin() here, but
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# I'm concerned about when it chooses to strip the last
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# portion of the path, and when it doesn't.
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path = '/'.join(basepath)
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return urlparse.urlunparse((self._proto,
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self._host, path, '', '', ''))
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def relpath(self, abspath):
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if not abspath.startswith(self.base):
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raise NonRelativePath('path %r is not under base URL %r'
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% (abspath, self.base))
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pl = len(self.base)
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return abspath[pl:].lstrip('/')
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def has(self, relpath):
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"""Does the target location exist?
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TODO: HttpTransport.has() should use a HEAD request,
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not a full GET request.
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TODO: This should be changed so that we don't use
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urllib2 and get an exception, the code path would be
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cleaner if we just do an http HEAD request, and parse
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the return code.
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"""
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try:
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f = get_url(self.abspath(relpath))
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# Without the read and then close()
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# we tend to have busy sockets.
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f.read()
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f.close()
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return True
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except BzrError:
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return False
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except urllib2.URLError:
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return False
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except IOError, e:
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if e.errno == errno.ENOENT:
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return False
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raise HttpTransportError(orig_error=e)
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def get(self, relpath, decode=False):
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"""Get the file at the given relative path.
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:param relpath: The relative path to the file
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"""
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try:
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return get_url(self.abspath(relpath))
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except (BzrError, urllib2.URLError, IOError), e:
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raise NoSuchFile(orig_error=e)
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except Exception,e:
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raise HttpTransportError(orig_error=e)
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def get_partial(self, relpath, start, length=None):
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"""Get just part of a file.
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:param relpath: Path to the file, relative to base
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:param start: The starting position to read from
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:param length: The length to read. A length of None indicates
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read to the end of the file.
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:return: A file-like object containing at least the specified bytes.
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Some implementations may return objects which can be read
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past this length, but this is not guaranteed.
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"""
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# TODO: You can make specialized http requests for just
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# a portion of the file. Figure out how to do that.
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# For now, urllib2 returns files that cannot seek() so
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# we just read bytes off the beginning, until we
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# get to the point that we care about.
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f = self.get(relpath)
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# TODO: read in smaller chunks, in case things are
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# buffered internally.
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f.read(start)
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return f
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def put(self, relpath, f):
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"""Copy the file-like or string object into the location.
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:param relpath: Location to put the contents, relative to base.
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:param f: File-like or string object.
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"""
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raise TransportNotPossible('http PUT not supported')
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def mkdir(self, relpath):
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"""Create a directory at the given path."""
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raise TransportNotPossible('http does not support mkdir()')
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def append(self, relpath, f):
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"""Append the text in the file-like object into the final
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location.
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"""
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raise TransportNotPossible('http does not support append()')
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def copy(self, rel_from, rel_to):
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"""Copy the item at rel_from to the location at rel_to"""
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raise TransportNotPossible('http does not support copy()')
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def copy_to(self, relpaths, other, pb=None):
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"""Copy a set of entries from self into another Transport.
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:param relpaths: A list/generator of entries to be copied.
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TODO: if other is LocalTransport, is it possible to
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do better than put(get())?
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"""
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# At this point HttpTransport might be able to check and see if
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# the remote location is the same, and rather than download, and
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# then upload, it could just issue a remote copy_this command.
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if isinstance(other, HttpTransport):
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raise TransportNotPossible('http cannot be the target of copy_to()')
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else:
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return super(HttpTransport, self).copy_to(relpaths, other, pb=pb)
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def move(self, rel_from, rel_to):
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"""Move the item at rel_from to the location at rel_to"""
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raise TransportNotPossible('http does not support move()')
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def delete(self, relpath):
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"""Delete the item at relpath"""
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raise TransportNotPossible('http does not support delete()')
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def list_dir(self, relpath):
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"""Return a list of all files at the given location.
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WARNING: many transports do not support this, so trying avoid using
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it if at all possible.
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"""
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raise TransportNotPossible('http does not support list_dir()')
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def stat(self, relpath):
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"""Return the stat information for a file.
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"""
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raise TransportNotPossible('http does not support stat()')
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def lock_read(self, relpath):
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"""Lock the given file for shared (read) access.
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:return: A lock object, which should be passed to Transport.unlock()
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"""
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# The old RemoteBranch ignore lock for reading, so we will
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# continue that tradition and return a bogus lock object.
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class BogusLock(object):
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def __init__(self, path):
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self.path = path
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def unlock(self):
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pass
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return BogusLock(relpath)
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def lock_write(self, relpath):
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"""Lock the given file for exclusive (write) access.
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WARNING: many transports do not support this, so trying avoid using it
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:return: A lock object, which should be passed to Transport.unlock()
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"""
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raise TransportNotPossible('http does not support lock_write()')
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register_transport('http://', HttpTransport)
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register_transport('https://', HttpTransport)
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