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d5338b2208
The wirepeer class provides concrete implementations of peer interface methods for calling wire protocol commands. It makes sense for this class to inherit from the peer abstract base class. So we change that. Since httppeer and sshpeer have already been converted to the new interface, peerrepository is no longer adding any value. So it has been removed. httppeer and sshpeer have been updated to reflect the loss of peerrepository and the inheritance of the abstract base class in wirepeer. The code changes in wirepeer are reordering of methods to group by interface. Some Python code in tests was updated to reflect changed APIs. .. api:: peer.peerrepository has been removed. Use repository.peer abstract base class to represent a peer repository. Differential Revision: https://phab.mercurial-scm.org/D338
465 lines
16 KiB
Python
465 lines
16 KiB
Python
# httppeer.py - HTTP repository proxy classes for mercurial
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#
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import errno
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import io
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import os
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import socket
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import struct
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import tempfile
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from .i18n import _
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from .node import nullid
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from . import (
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bundle2,
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error,
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httpconnection,
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pycompat,
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statichttprepo,
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url,
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util,
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wireproto,
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)
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httplib = util.httplib
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urlerr = util.urlerr
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urlreq = util.urlreq
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def encodevalueinheaders(value, header, limit):
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"""Encode a string value into multiple HTTP headers.
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``value`` will be encoded into 1 or more HTTP headers with the names
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``header-<N>`` where ``<N>`` is an integer starting at 1. Each header
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name + value will be at most ``limit`` bytes long.
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Returns an iterable of 2-tuples consisting of header names and values.
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"""
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fmt = header + '-%s'
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valuelen = limit - len(fmt % '000') - len(': \r\n')
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result = []
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n = 0
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for i in xrange(0, len(value), valuelen):
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n += 1
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result.append((fmt % str(n), value[i:i + valuelen]))
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return result
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def _wraphttpresponse(resp):
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"""Wrap an HTTPResponse with common error handlers.
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This ensures that any I/O from any consumer raises the appropriate
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error and messaging.
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"""
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origread = resp.read
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class readerproxy(resp.__class__):
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def read(self, size=None):
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try:
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return origread(size)
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except httplib.IncompleteRead as e:
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# e.expected is an integer if length known or None otherwise.
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if e.expected:
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msg = _('HTTP request error (incomplete response; '
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'expected %d bytes got %d)') % (e.expected,
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len(e.partial))
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else:
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msg = _('HTTP request error (incomplete response)')
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raise error.PeerTransportError(
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msg,
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hint=_('this may be an intermittent network failure; '
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'if the error persists, consider contacting the '
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'network or server operator'))
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except httplib.HTTPException as e:
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raise error.PeerTransportError(
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_('HTTP request error (%s)') % e,
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hint=_('this may be an intermittent network failure; '
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'if the error persists, consider contacting the '
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'network or server operator'))
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resp.__class__ = readerproxy
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class _multifile(object):
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def __init__(self, *fileobjs):
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for f in fileobjs:
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if not util.safehasattr(f, 'length'):
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raise ValueError(
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'_multifile only supports file objects that '
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'have a length but this one does not:', type(f), f)
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self._fileobjs = fileobjs
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self._index = 0
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@property
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def length(self):
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return sum(f.length for f in self._fileobjs)
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def read(self, amt=None):
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if amt <= 0:
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return ''.join(f.read() for f in self._fileobjs)
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parts = []
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while amt and self._index < len(self._fileobjs):
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parts.append(self._fileobjs[self._index].read(amt))
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got = len(parts[-1])
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if got < amt:
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self._index += 1
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amt -= got
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return ''.join(parts)
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def seek(self, offset, whence=os.SEEK_SET):
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if whence != os.SEEK_SET:
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raise NotImplementedError(
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'_multifile does not support anything other'
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' than os.SEEK_SET for whence on seek()')
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if offset != 0:
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raise NotImplementedError(
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'_multifile only supports seeking to start, but that '
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'could be fixed if you need it')
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for f in self._fileobjs:
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f.seek(0)
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self._index = 0
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class httppeer(wireproto.wirepeer):
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def __init__(self, ui, path):
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self._path = path
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self._caps = None
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self._urlopener = None
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self._requestbuilder = None
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u = util.url(path)
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if u.query or u.fragment:
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raise error.Abort(_('unsupported URL component: "%s"') %
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(u.query or u.fragment))
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# urllib cannot handle URLs with embedded user or passwd
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self._url, authinfo = u.authinfo()
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self._ui = ui
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ui.debug('using %s\n' % self._url)
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self._urlopener = url.opener(ui, authinfo)
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self._requestbuilder = urlreq.request
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def __del__(self):
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urlopener = getattr(self, '_urlopener', None)
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if urlopener:
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for h in urlopener.handlers:
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h.close()
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getattr(h, "close_all", lambda : None)()
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# Begin of _basepeer interface.
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@util.propertycache
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def ui(self):
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return self._ui
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def url(self):
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return self._path
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def local(self):
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return None
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def peer(self):
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return self
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def canpush(self):
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return True
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def close(self):
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pass
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# End of _basepeer interface.
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# Begin of _basewirepeer interface.
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def capabilities(self):
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if self._caps is None:
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try:
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self._fetchcaps()
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except error.RepoError:
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self._caps = set()
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self.ui.debug('capabilities: %s\n' %
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(' '.join(self._caps or ['none'])))
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return self._caps
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# End of _basewirepeer interface.
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# look up capabilities only when needed
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def _fetchcaps(self):
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self._caps = set(self._call('capabilities').split())
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def _callstream(self, cmd, _compressible=False, **args):
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if cmd == 'pushkey':
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args['data'] = ''
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data = args.pop('data', None)
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headers = args.pop('headers', {})
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self.ui.debug("sending %s command\n" % cmd)
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q = [('cmd', cmd)]
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headersize = 0
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varyheaders = []
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# Important: don't use self.capable() here or else you end up
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# with infinite recursion when trying to look up capabilities
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# for the first time.
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postargsok = self._caps is not None and 'httppostargs' in self._caps
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if postargsok and args:
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strargs = urlreq.urlencode(sorted(args.items()))
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if not data:
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data = strargs
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else:
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if isinstance(data, basestring):
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i = io.BytesIO(data)
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i.length = len(data)
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data = i
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argsio = io.BytesIO(strargs)
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argsio.length = len(strargs)
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data = _multifile(argsio, data)
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headers['X-HgArgs-Post'] = len(strargs)
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else:
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if len(args) > 0:
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httpheader = self.capable('httpheader')
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if httpheader:
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headersize = int(httpheader.split(',', 1)[0])
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if headersize > 0:
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# The headers can typically carry more data than the URL.
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encargs = urlreq.urlencode(sorted(args.items()))
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for header, value in encodevalueinheaders(encargs, 'X-HgArg',
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headersize):
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headers[header] = value
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varyheaders.append(header)
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else:
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q += sorted(args.items())
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qs = '?%s' % urlreq.urlencode(q)
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cu = "%s%s" % (self._url, qs)
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size = 0
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if util.safehasattr(data, 'length'):
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size = data.length
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elif data is not None:
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size = len(data)
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if size and self.ui.configbool('ui', 'usehttp2'):
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headers['Expect'] = '100-Continue'
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headers['X-HgHttp2'] = '1'
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if data is not None and 'Content-Type' not in headers:
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headers['Content-Type'] = 'application/mercurial-0.1'
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# Tell the server we accept application/mercurial-0.2 and multiple
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# compression formats if the server is capable of emitting those
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# payloads.
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protoparams = []
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mediatypes = set()
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if self._caps is not None:
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mt = self.capable('httpmediatype')
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if mt:
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protoparams.append('0.1')
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mediatypes = set(mt.split(','))
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if '0.2tx' in mediatypes:
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protoparams.append('0.2')
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if '0.2tx' in mediatypes and self.capable('compression'):
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# We /could/ compare supported compression formats and prune
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# non-mutually supported or error if nothing is mutually supported.
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# For now, send the full list to the server and have it error.
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comps = [e.wireprotosupport().name for e in
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util.compengines.supportedwireengines(util.CLIENTROLE)]
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protoparams.append('comp=%s' % ','.join(comps))
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if protoparams:
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protoheaders = encodevalueinheaders(' '.join(protoparams),
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'X-HgProto',
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headersize or 1024)
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for header, value in protoheaders:
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headers[header] = value
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varyheaders.append(header)
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if varyheaders:
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headers['Vary'] = ','.join(varyheaders)
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req = self._requestbuilder(cu, data, headers)
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if data is not None:
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self.ui.debug("sending %s bytes\n" % size)
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req.add_unredirected_header('Content-Length', '%d' % size)
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try:
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resp = self._urlopener.open(req)
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except urlerr.httperror as inst:
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if inst.code == 401:
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raise error.Abort(_('authorization failed'))
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raise
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except httplib.HTTPException as inst:
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self.ui.debug('http error while sending %s command\n' % cmd)
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self.ui.traceback()
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raise IOError(None, inst)
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# Insert error handlers for common I/O failures.
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_wraphttpresponse(resp)
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# record the url we got redirected to
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resp_url = resp.geturl()
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if resp_url.endswith(qs):
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resp_url = resp_url[:-len(qs)]
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if self._url.rstrip('/') != resp_url.rstrip('/'):
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if not self.ui.quiet:
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self.ui.warn(_('real URL is %s\n') % resp_url)
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self._url = resp_url
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try:
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proto = resp.getheader('content-type')
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except AttributeError:
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proto = resp.headers.get('content-type', '')
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safeurl = util.hidepassword(self._url)
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if proto.startswith('application/hg-error'):
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raise error.OutOfBandError(resp.read())
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# accept old "text/plain" and "application/hg-changegroup" for now
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if not (proto.startswith('application/mercurial-') or
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(proto.startswith('text/plain')
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and not resp.headers.get('content-length')) or
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proto.startswith('application/hg-changegroup')):
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self.ui.debug("requested URL: '%s'\n" % util.hidepassword(cu))
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raise error.RepoError(
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_("'%s' does not appear to be an hg repository:\n"
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"---%%<--- (%s)\n%s\n---%%<---\n")
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% (safeurl, proto or 'no content-type', resp.read(1024)))
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if proto.startswith('application/mercurial-'):
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try:
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version = proto.split('-', 1)[1]
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version_info = tuple([int(n) for n in version.split('.')])
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except ValueError:
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raise error.RepoError(_("'%s' sent a broken Content-Type "
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"header (%s)") % (safeurl, proto))
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# TODO consider switching to a decompression reader that uses
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# generators.
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if version_info == (0, 1):
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if _compressible:
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return util.compengines['zlib'].decompressorreader(resp)
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return resp
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elif version_info == (0, 2):
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# application/mercurial-0.2 always identifies the compression
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# engine in the payload header.
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elen = struct.unpack('B', resp.read(1))[0]
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ename = resp.read(elen)
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engine = util.compengines.forwiretype(ename)
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return engine.decompressorreader(resp)
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else:
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raise error.RepoError(_("'%s' uses newer protocol %s") %
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(safeurl, version))
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if _compressible:
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return util.compengines['zlib'].decompressorreader(resp)
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return resp
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def _call(self, cmd, **args):
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fp = self._callstream(cmd, **args)
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try:
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return fp.read()
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finally:
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# if using keepalive, allow connection to be reused
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fp.close()
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def _callpush(self, cmd, cg, **args):
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# have to stream bundle to a temp file because we do not have
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# http 1.1 chunked transfer.
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types = self.capable('unbundle')
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try:
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types = types.split(',')
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except AttributeError:
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# servers older than d1b16a746db6 will send 'unbundle' as a
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# boolean capability. They only support headerless/uncompressed
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# bundles.
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types = [""]
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for x in types:
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if x in bundle2.bundletypes:
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type = x
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break
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tempname = bundle2.writebundle(self.ui, cg, None, type)
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fp = httpconnection.httpsendfile(self.ui, tempname, "rb")
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headers = {'Content-Type': 'application/mercurial-0.1'}
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try:
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r = self._call(cmd, data=fp, headers=headers, **args)
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vals = r.split('\n', 1)
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if len(vals) < 2:
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raise error.ResponseError(_("unexpected response:"), r)
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return vals
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except socket.error as err:
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if err.args[0] in (errno.ECONNRESET, errno.EPIPE):
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raise error.Abort(_('push failed: %s') % err.args[1])
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raise error.Abort(err.args[1])
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finally:
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fp.close()
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os.unlink(tempname)
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def _calltwowaystream(self, cmd, fp, **args):
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fh = None
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fp_ = None
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filename = None
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try:
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# dump bundle to disk
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fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg")
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fh = os.fdopen(fd, pycompat.sysstr("wb"))
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d = fp.read(4096)
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while d:
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fh.write(d)
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d = fp.read(4096)
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fh.close()
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# start http push
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fp_ = httpconnection.httpsendfile(self.ui, filename, "rb")
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headers = {'Content-Type': 'application/mercurial-0.1'}
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return self._callstream(cmd, data=fp_, headers=headers, **args)
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finally:
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if fp_ is not None:
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fp_.close()
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if fh is not None:
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fh.close()
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os.unlink(filename)
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def _callcompressable(self, cmd, **args):
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return self._callstream(cmd, _compressible=True, **args)
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def _abort(self, exception):
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raise exception
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class httpspeer(httppeer):
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def __init__(self, ui, path):
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if not url.has_https:
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raise error.Abort(_('Python support for SSL and HTTPS '
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'is not installed'))
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httppeer.__init__(self, ui, path)
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def instance(ui, path, create):
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if create:
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raise error.Abort(_('cannot create new http repository'))
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try:
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if path.startswith('https:'):
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inst = httpspeer(ui, path)
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else:
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inst = httppeer(ui, path)
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try:
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# Try to do useful work when checking compatibility.
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# Usually saves a roundtrip since we want the caps anyway.
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inst._fetchcaps()
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except error.RepoError:
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# No luck, try older compatibility check.
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inst.between([(nullid, nullid)])
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return inst
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except error.RepoError as httpexception:
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try:
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r = statichttprepo.instance(ui, "static-" + path, create)
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ui.note(_('(falling back to static-http)\n'))
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return r
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except error.RepoError:
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raise httpexception # use the original http RepoError instead
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