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# httppeer.py - HTTP repository proxy classes for mercurial
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#
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# Copyright 2005, 2006 Olivia Mackall <olivia@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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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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from concurrent import futures
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from .i18n import _
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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 as urlmod,
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util,
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wireprotov1peer,
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)
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from .utils import urlutil
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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
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values as native strings.
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"""
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# HTTP Headers are ASCII. Python 3 requires them to be unicodes,
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# not bytes. This function always takes bytes in as arguments.
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fmt = pycompat.strurl(header) + r'-%s'
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# Note: it is *NOT* a bug that the last bit here is a bytestring
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# and not a unicode: we're just getting the encoded length anyway,
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# and using an r-string to make it portable between Python 2 and 3
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# doesn't work because then the \r is a literal backslash-r
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# instead of a carriage return.
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valuelen = limit - len(fmt % '000') - len(b': \r\n')
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result = []
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n = 0
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for i in range(0, len(value), valuelen):
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n += 1
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result.append((fmt % str(n), pycompat.strurl(value[i : i + valuelen])))
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return result
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class _multifile:
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def __init__(self, *fileobjs):
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for f in fileobjs:
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if not hasattr(f, 'length'):
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raise ValueError(
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b'_multifile only supports file objects that '
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b'have a length but this one does not:',
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type(f),
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f,
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)
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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 b''.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 b''.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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b'_multifile does not support anything other'
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b' than os.SEEK_SET for whence on seek()'
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)
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if offset != 0:
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raise NotImplementedError(
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b'_multifile only supports seeking to start, but that '
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b'could be fixed if you need it'
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)
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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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def makev1commandrequest(
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ui,
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requestbuilder,
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caps,
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capablefn,
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repobaseurl,
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cmd,
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args,
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remotehidden=False,
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):
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"""Make an HTTP request to run a command for a version 1 client.
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``caps`` is a set of known server capabilities. The value may be
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None if capabilities are not yet known.
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``capablefn`` is a function to evaluate a capability.
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``cmd``, ``args``, and ``data`` define the command, its arguments, and
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raw data to pass to it.
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"""
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if cmd == b'pushkey':
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args[b'data'] = b''
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data = args.pop(b'data', None)
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headers = args.pop(b'headers', {})
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ui.debug(b"sending %s command\n" % cmd)
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q = [(b'cmd', cmd)]
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if remotehidden:
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q.append(('access-hidden', '1'))
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headersize = 0
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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 = caps is not None and b'httppostargs' in caps
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# Send arguments via POST.
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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, bytes):
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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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elif args:
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# Calling self.capable() can infinite loop if we are calling
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# "capabilities". But that command should never accept wire
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# protocol arguments. So this should never happen.
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assert cmd != b'capabilities'
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httpheader = capablefn(b'httpheader')
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if httpheader:
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headersize = int(httpheader.split(b',', 1)[0])
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# Send arguments via HTTP headers.
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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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encoded_args = urlreq.urlencode(sorted(args.items()))
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for header, value in encodevalueinheaders(
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encoded_args, b'X-HgArg', headersize
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):
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headers[header] = value
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# Send arguments via query string (Mercurial <1.9).
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else:
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q += sorted(args.items())
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qs = b'?%s' % urlreq.urlencode(q)
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cu = b"%s%s" % (repobaseurl, qs)
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size = 0
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if hasattr(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 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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# Note: Keep this set empty by default, as client advertisement of
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# protocol parameters should only occur after the handshake.
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protoparams = set()
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mediatypes = set()
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if caps is not None:
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mt = capablefn(b'httpmediatype')
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if mt:
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protoparams.add(b'0.1')
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mediatypes = set(mt.split(b','))
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protoparams.add(b'partial-pull')
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if b'0.2tx' in mediatypes:
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protoparams.add(b'0.2')
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if b'0.2tx' in mediatypes and capablefn(b'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 = [
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e.wireprotosupport().name
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for e in util.compengines.supportedwireengines(util.CLIENTROLE)
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]
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protoparams.add(b'comp=%s' % b','.join(comps))
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if protoparams:
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protoheaders = encodevalueinheaders(
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b' '.join(sorted(protoparams)), b'X-HgProto', headersize or 1024
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)
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for header, value in protoheaders:
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headers[header] = value
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varyheaders = []
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for header in headers:
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if header.lower().startswith('x-hg'):
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varyheaders.append(header)
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if varyheaders:
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headers['Vary'] = ','.join(sorted(varyheaders))
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req = requestbuilder(pycompat.strurl(cu), data, headers)
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if data is not None:
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ui.debug(b"sending %d bytes\n" % size)
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req.add_unredirected_header('Content-Length', '%d' % size)
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return req, cu, qs
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def sendrequest(ui, opener, req):
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"""Send a prepared HTTP request.
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Returns the response object.
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"""
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dbg = ui.debug
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if ui.debugflag and ui.configbool(b'devel', b'debug.peer-request'):
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line = b'devel-peer-request: %s\n'
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dbg(
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line
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% b'%s %s'
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% (
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pycompat.bytesurl(req.get_method()),
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pycompat.bytesurl(req.get_full_url()),
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)
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)
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hgargssize = None
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for header, value in sorted(req.header_items()):
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header = pycompat.bytesurl(header)
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value = pycompat.bytesurl(value)
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if header.startswith(b'X-hgarg-'):
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if hgargssize is None:
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hgargssize = 0
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hgargssize += len(value)
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else:
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dbg(line % b' %s %s' % (header, value))
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if hgargssize is not None:
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dbg(
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line
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% b' %d bytes of commands arguments in headers'
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% hgargssize
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)
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data = req.data
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if data is not None:
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length = getattr(data, 'length', None)
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if length is None:
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length = len(data)
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dbg(line % b' %d bytes of data' % length)
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start = util.timer()
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res = None
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try:
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res = opener.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(_(b'authorization failed'))
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raise
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except httplib.HTTPException as inst:
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ui.debug(
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b'http error requesting %s\n'
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% urlutil.hidepassword(req.get_full_url())
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)
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ui.traceback()
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raise IOError(None, inst)
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finally:
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if ui.debugflag and ui.configbool(b'devel', b'debug.peer-request'):
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code = res.code if res else -1
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dbg(
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line
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% b' finished in %.4f seconds (%d)'
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% (util.timer() - start, code)
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)
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# Insert error handlers for common I/O failures.
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urlmod.wrapresponse(res)
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return res
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class RedirectedRepoError(error.RepoError):
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def __init__(self, msg, respurl):
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super(RedirectedRepoError, self).__init__(msg)
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self.respurl = respurl
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def parsev1commandresponse(ui, baseurl, requrl, qs, resp, compressible):
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# record the url we got redirected to
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redirected = False
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respurl = pycompat.bytesurl(resp.geturl())
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if respurl.endswith(qs):
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respurl = respurl[: -len(qs)]
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qsdropped = False
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else:
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qsdropped = True
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if baseurl.rstrip(b'/') != respurl.rstrip(b'/'):
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redirected = True
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if not ui.quiet:
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ui.warn(_(b'real URL is %s\n') % respurl)
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try:
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proto = pycompat.bytesurl(resp.getheader('content-type', ''))
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except AttributeError:
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proto = pycompat.bytesurl(resp.headers.get('content-type', ''))
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safeurl = urlutil.hidepassword(baseurl)
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if proto.startswith(b'application/hg-error'):
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raise error.OutOfBandError(resp.read())
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# Pre 1.0 versions of Mercurial used text/plain and
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# application/hg-changegroup. We don't support such old servers.
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if not proto.startswith(b'application/mercurial-'):
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ui.debug(b"requested URL: '%s'\n" % urlutil.hidepassword(requrl))
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msg = _(
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b"'%s' does not appear to be an hg repository:\n"
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b"---%%<--- (%s)\n%s\n---%%<---\n"
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) % (safeurl, proto or b'no content-type', resp.read(1024))
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# Some servers may strip the query string from the redirect. We
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# raise a special error type so callers can react to this specially.
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if redirected and qsdropped:
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raise RedirectedRepoError(msg, respurl)
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else:
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raise error.RepoError(msg)
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try:
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subtype = proto.split(b'-', 1)[1]
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version_info = tuple([int(n) for n in subtype.split(b'.')])
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except ValueError:
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raise error.RepoError(
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_(b"'%s' sent a broken Content-Type header (%s)") % (safeurl, proto)
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)
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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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resp = util.compengines[b'zlib'].decompressorreader(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'B', util.readexactly(resp, 1))[0]
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ename = util.readexactly(resp, elen)
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engine = util.compengines.forwiretype(ename)
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resp = engine.decompressorreader(resp)
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else:
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raise error.RepoError(
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_(b"'%s' uses newer protocol %s") % (safeurl, subtype)
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)
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return respurl, proto, resp
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class httppeer(wireprotov1peer.wirepeer):
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def __init__(
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self, ui, path, url, opener, requestbuilder, caps, remotehidden=False
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):
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super().__init__(ui, path=path, remotehidden=remotehidden)
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self._url = url
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self._caps = caps
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self.limitedarguments = caps is not None and b'httppostargs' not in caps
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self._urlopener = opener
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self._requestbuilder = requestbuilder
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self._remotehidden = remotehidden
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def __del__(self):
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for h in self._urlopener.handlers:
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h.close()
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getattr(h, "close_all", lambda: None)()
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# Begin of ipeerconnection interface.
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def url(self):
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return self.path.loc
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def local(self):
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return None
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def canpush(self):
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return True
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def close(self):
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try:
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reqs, sent, recv = (
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self._urlopener.requestscount,
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self._urlopener.sentbytescount,
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self._urlopener.receivedbytescount,
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)
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except AttributeError:
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return
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self.ui.note(
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_(
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b'(sent %d HTTP requests and %d bytes; '
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b'received %d bytes in responses)\n'
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)
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% (reqs, sent, recv)
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)
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# End of ipeerconnection interface.
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# Begin of ipeercommands interface.
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def capabilities(self):
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return self._caps
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def _finish_inline_clone_bundle(self, stream):
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# HTTP streams must hit the end to process the last empty
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# chunk of Chunked-Encoding so the connection can be reused.
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chunk = stream.read(1)
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if chunk:
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|
|
self._abort(error.ResponseError(_(b"unexpected response:"), chunk))
|
|
|
|
|
|
# End of ipeercommands interface.
|
|
|
|
|
|
def _callstream(self, cmd, _compressible=False, **args):
|
|
|
args = pycompat.byteskwargs(args)
|
|
|
|
|
|
req, cu, qs = makev1commandrequest(
|
|
|
self.ui,
|
|
|
self._requestbuilder,
|
|
|
self._caps,
|
|
|
self.capable,
|
|
|
self._url,
|
|
|
cmd,
|
|
|
args,
|
|
|
self._remotehidden,
|
|
|
)
|
|
|
|
|
|
resp = sendrequest(self.ui, self._urlopener, req)
|
|
|
|
|
|
self._url, ct, resp = parsev1commandresponse(
|
|
|
self.ui, self._url, cu, qs, resp, _compressible
|
|
|
)
|
|
|
|
|
|
return resp
|
|
|
|
|
|
def _call(self, cmd, **args):
|
|
|
fp = self._callstream(cmd, **args)
|
|
|
try:
|
|
|
return fp.read()
|
|
|
finally:
|
|
|
# if using keepalive, allow connection to be reused
|
|
|
fp.close()
|
|
|
|
|
|
def _callpush(self, cmd, cg, **args):
|
|
|
# have to stream bundle to a temp file because we do not have
|
|
|
# http 1.1 chunked transfer.
|
|
|
|
|
|
types = self.capable(b'unbundle')
|
|
|
try:
|
|
|
types = types.split(b',')
|
|
|
except AttributeError:
|
|
|
# servers older than d1b16a746db6 will send 'unbundle' as a
|
|
|
# boolean capability. They only support headerless/uncompressed
|
|
|
# bundles.
|
|
|
types = [b""]
|
|
|
for x in types:
|
|
|
if x in bundle2.bundletypes:
|
|
|
type = x
|
|
|
break
|
|
|
|
|
|
tempname = bundle2.writebundle(self.ui, cg, None, type)
|
|
|
fp = httpconnection.httpsendfile(self.ui, tempname, b"rb")
|
|
|
headers = {'Content-Type': 'application/mercurial-0.1'}
|
|
|
|
|
|
try:
|
|
|
r = self._call(cmd, data=fp, headers=headers, **args)
|
|
|
vals = r.split(b'\n', 1)
|
|
|
if len(vals) < 2:
|
|
|
raise error.ResponseError(_(b"unexpected response:"), r)
|
|
|
return vals
|
|
|
except urlerr.httperror:
|
|
|
# Catch and re-raise these so we don't try and treat them
|
|
|
# like generic socket errors. They lack any values in
|
|
|
# .args on Python 3 which breaks our socket.error block.
|
|
|
raise
|
|
|
except socket.error as err:
|
|
|
if err.args[0] in (errno.ECONNRESET, errno.EPIPE):
|
|
|
raise error.Abort(_(b'push failed: %s') % err.args[1])
|
|
|
raise error.Abort(err.args[1])
|
|
|
finally:
|
|
|
fp.close()
|
|
|
os.unlink(tempname)
|
|
|
|
|
|
def _calltwowaystream(self, cmd, fp, **args):
|
|
|
filename = None
|
|
|
try:
|
|
|
# dump bundle to disk
|
|
|
fd, filename = pycompat.mkstemp(prefix=b"hg-bundle-", suffix=b".hg")
|
|
|
with os.fdopen(fd, "wb") as fh:
|
|
|
d = fp.read(4096)
|
|
|
while d:
|
|
|
fh.write(d)
|
|
|
d = fp.read(4096)
|
|
|
# start http push
|
|
|
with httpconnection.httpsendfile(self.ui, filename, b"rb") as fp_:
|
|
|
headers = {'Content-Type': 'application/mercurial-0.1'}
|
|
|
return self._callstream(cmd, data=fp_, headers=headers, **args)
|
|
|
finally:
|
|
|
if filename is not None:
|
|
|
os.unlink(filename)
|
|
|
|
|
|
def _callcompressable(self, cmd, **args):
|
|
|
return self._callstream(cmd, _compressible=True, **args)
|
|
|
|
|
|
def _abort(self, exception):
|
|
|
raise exception
|
|
|
|
|
|
|
|
|
class queuedcommandfuture(futures.Future):
|
|
|
"""Wraps result() on command futures to trigger submission on call."""
|
|
|
|
|
|
def result(self, timeout=None):
|
|
|
if self.done():
|
|
|
return futures.Future.result(self, timeout)
|
|
|
|
|
|
self._peerexecutor.sendcommands()
|
|
|
|
|
|
# sendcommands() will restore the original __class__ and self.result
|
|
|
# will resolve to Future.result.
|
|
|
return self.result(timeout)
|
|
|
|
|
|
|
|
|
def performhandshake(ui, url, opener, requestbuilder):
|
|
|
# The handshake is a request to the capabilities command.
|
|
|
|
|
|
caps = None
|
|
|
|
|
|
def capable(x):
|
|
|
raise error.ProgrammingError(b'should not be called')
|
|
|
|
|
|
args = {}
|
|
|
|
|
|
req, requrl, qs = makev1commandrequest(
|
|
|
ui, requestbuilder, caps, capable, url, b'capabilities', args
|
|
|
)
|
|
|
resp = sendrequest(ui, opener, req)
|
|
|
|
|
|
# The server may redirect us to the repo root, stripping the
|
|
|
# ?cmd=capabilities query string from the URL. The server would likely
|
|
|
# return HTML in this case and ``parsev1commandresponse()`` would raise.
|
|
|
# We catch this special case and re-issue the capabilities request against
|
|
|
# the new URL.
|
|
|
#
|
|
|
# We should ideally not do this, as a redirect that drops the query
|
|
|
# string from the URL is arguably a server bug. (Garbage in, garbage out).
|
|
|
# However, Mercurial clients for several years appeared to handle this
|
|
|
# issue without behavior degradation. And according to issue 5860, it may
|
|
|
# be a longstanding bug in some server implementations. So we allow a
|
|
|
# redirect that drops the query string to "just work."
|
|
|
try:
|
|
|
respurl, ct, resp = parsev1commandresponse(
|
|
|
ui, url, requrl, qs, resp, compressible=False
|
|
|
)
|
|
|
except RedirectedRepoError as e:
|
|
|
req, requrl, qs = makev1commandrequest(
|
|
|
ui, requestbuilder, caps, capable, e.respurl, b'capabilities', args
|
|
|
)
|
|
|
resp = sendrequest(ui, opener, req)
|
|
|
respurl, ct, resp = parsev1commandresponse(
|
|
|
ui, url, requrl, qs, resp, compressible=False
|
|
|
)
|
|
|
|
|
|
try:
|
|
|
rawdata = resp.read()
|
|
|
finally:
|
|
|
resp.close()
|
|
|
|
|
|
if not ct.startswith(b'application/mercurial-'):
|
|
|
raise error.ProgrammingError(b'unexpected content-type: %s' % ct)
|
|
|
|
|
|
info = {b'v1capabilities': set(rawdata.split())}
|
|
|
|
|
|
return respurl, info
|
|
|
|
|
|
|
|
|
def _make_peer(
|
|
|
ui, path, opener=None, requestbuilder=urlreq.request, remotehidden=False
|
|
|
):
|
|
|
"""Construct an appropriate HTTP peer instance.
|
|
|
|
|
|
``opener`` is an ``url.opener`` that should be used to establish
|
|
|
connections, perform HTTP requests.
|
|
|
|
|
|
``requestbuilder`` is the type used for constructing HTTP requests.
|
|
|
It exists as an argument so extensions can override the default.
|
|
|
"""
|
|
|
if path.url.query or path.url.fragment:
|
|
|
msg = _(b'unsupported URL component: "%s"')
|
|
|
msg %= path.url.query or path.url.fragment
|
|
|
raise error.Abort(msg)
|
|
|
|
|
|
# urllib cannot handle URLs with embedded user or passwd.
|
|
|
url, authinfo = path.url.authinfo()
|
|
|
ui.debug(b'using %s\n' % url)
|
|
|
|
|
|
opener = opener or urlmod.opener(ui, authinfo)
|
|
|
|
|
|
respurl, info = performhandshake(ui, url, opener, requestbuilder)
|
|
|
|
|
|
return httppeer(
|
|
|
ui,
|
|
|
path,
|
|
|
respurl,
|
|
|
opener,
|
|
|
requestbuilder,
|
|
|
info[b'v1capabilities'],
|
|
|
remotehidden=remotehidden,
|
|
|
)
|
|
|
|
|
|
|
|
|
def make_peer(
|
|
|
ui, path, create, intents=None, createopts=None, remotehidden=False
|
|
|
):
|
|
|
if create:
|
|
|
raise error.Abort(_(b'cannot create new http repository'))
|
|
|
try:
|
|
|
if path.url.scheme == b'https' and not urlmod.has_https:
|
|
|
raise error.Abort(
|
|
|
_(b'Python support for SSL and HTTPS is not installed')
|
|
|
)
|
|
|
|
|
|
inst = _make_peer(ui, path, remotehidden=remotehidden)
|
|
|
|
|
|
return inst
|
|
|
except error.RepoError as httpexception:
|
|
|
try:
|
|
|
r = statichttprepo.make_peer(ui, b"static-" + path.loc, create)
|
|
|
ui.note(_(b'(falling back to static-http)\n'))
|
|
|
return r
|
|
|
except error.RepoError:
|
|
|
raise httpexception # use the original http RepoError instead
|
|
|
|