sparse: move config parsing into core
This patch marks the beginning of moving code from the sparse
extension into core. The goal is to move as much of the
functionality as possible into core, where it will be an
experimental feature. The extension will likely continue to
exist to enable the feature and provide UI elements.
As part of the move, the repo method was converted to a module
function. It doesn't need to exist on repos.
An error message was also updated to reflect that an error isn't
necessarily from the .hg/sparse file. The API should be updated
later to pass in a filename so the error can be more descriptive.
Copyright of the added file was copied from the sparse extension.
# httppeer.py - HTTP repository proxy classes for mercurial
#
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import errno
import os
import socket
import struct
import tempfile
from .i18n import _
from .node import nullid
from . import (
bundle2,
error,
httpconnection,
pycompat,
statichttprepo,
url,
util,
wireproto,
)
httplib = util.httplib
urlerr = util.urlerr
urlreq = util.urlreq
def encodevalueinheaders(value, header, limit):
"""Encode a string value into multiple HTTP headers.
``value`` will be encoded into 1 or more HTTP headers with the names
``header-<N>`` where ``<N>`` is an integer starting at 1. Each header
name + value will be at most ``limit`` bytes long.
Returns an iterable of 2-tuples consisting of header names and values.
"""
fmt = header + '-%s'
valuelen = limit - len(fmt % '000') - len(': \r\n')
result = []
n = 0
for i in xrange(0, len(value), valuelen):
n += 1
result.append((fmt % str(n), value[i:i + valuelen]))
return result
def _wraphttpresponse(resp):
"""Wrap an HTTPResponse with common error handlers.
This ensures that any I/O from any consumer raises the appropriate
error and messaging.
"""
origread = resp.read
class readerproxy(resp.__class__):
def read(self, size=None):
try:
return origread(size)
except httplib.IncompleteRead as e:
# e.expected is an integer if length known or None otherwise.
if e.expected:
msg = _('HTTP request error (incomplete response; '
'expected %d bytes got %d)') % (e.expected,
len(e.partial))
else:
msg = _('HTTP request error (incomplete response)')
raise error.PeerTransportError(
msg,
hint=_('this may be an intermittent network failure; '
'if the error persists, consider contacting the '
'network or server operator'))
except httplib.HTTPException as e:
raise error.PeerTransportError(
_('HTTP request error (%s)') % e,
hint=_('this may be an intermittent network failure; '
'if the error persists, consider contacting the '
'network or server operator'))
resp.__class__ = readerproxy
class httppeer(wireproto.wirepeer):
def __init__(self, ui, path):
self.path = path
self.caps = None
self.handler = None
self.urlopener = None
self.requestbuilder = None
u = util.url(path)
if u.query or u.fragment:
raise error.Abort(_('unsupported URL component: "%s"') %
(u.query or u.fragment))
# urllib cannot handle URLs with embedded user or passwd
self._url, authinfo = u.authinfo()
self.ui = ui
self.ui.debug('using %s\n' % self._url)
self.urlopener = url.opener(ui, authinfo)
self.requestbuilder = urlreq.request
def __del__(self):
urlopener = getattr(self, 'urlopener', None)
if urlopener:
for h in urlopener.handlers:
h.close()
getattr(h, "close_all", lambda : None)()
def url(self):
return self.path
# look up capabilities only when needed
def _fetchcaps(self):
self.caps = set(self._call('capabilities').split())
def _capabilities(self):
if self.caps is None:
try:
self._fetchcaps()
except error.RepoError:
self.caps = set()
self.ui.debug('capabilities: %s\n' %
(' '.join(self.caps or ['none'])))
return self.caps
def lock(self):
raise error.Abort(_('operation not supported over http'))
def _callstream(self, cmd, _compressible=False, **args):
if cmd == 'pushkey':
args['data'] = ''
data = args.pop('data', None)
headers = args.pop('headers', {})
self.ui.debug("sending %s command\n" % cmd)
q = [('cmd', cmd)]
headersize = 0
varyheaders = []
# Important: don't use self.capable() here or else you end up
# with infinite recursion when trying to look up capabilities
# for the first time.
postargsok = self.caps is not None and 'httppostargs' in self.caps
# TODO: support for httppostargs when data is a file-like
# object rather than a basestring
canmungedata = not data or isinstance(data, basestring)
if postargsok and canmungedata:
strargs = urlreq.urlencode(sorted(args.items()))
if strargs:
if not data:
data = strargs
elif isinstance(data, basestring):
data = strargs + data
headers['X-HgArgs-Post'] = len(strargs)
else:
if len(args) > 0:
httpheader = self.capable('httpheader')
if httpheader:
headersize = int(httpheader.split(',', 1)[0])
if headersize > 0:
# The headers can typically carry more data than the URL.
encargs = urlreq.urlencode(sorted(args.items()))
for header, value in encodevalueinheaders(encargs, 'X-HgArg',
headersize):
headers[header] = value
varyheaders.append(header)
else:
q += sorted(args.items())
qs = '?%s' % urlreq.urlencode(q)
cu = "%s%s" % (self._url, qs)
size = 0
if util.safehasattr(data, 'length'):
size = data.length
elif data is not None:
size = len(data)
if size and self.ui.configbool('ui', 'usehttp2', False):
headers['Expect'] = '100-Continue'
headers['X-HgHttp2'] = '1'
if data is not None and 'Content-Type' not in headers:
headers['Content-Type'] = 'application/mercurial-0.1'
# Tell the server we accept application/mercurial-0.2 and multiple
# compression formats if the server is capable of emitting those
# payloads.
protoparams = []
mediatypes = set()
if self.caps is not None:
mt = self.capable('httpmediatype')
if mt:
protoparams.append('0.1')
mediatypes = set(mt.split(','))
if '0.2tx' in mediatypes:
protoparams.append('0.2')
if '0.2tx' in mediatypes and self.capable('compression'):
# We /could/ compare supported compression formats and prune
# non-mutually supported or error if nothing is mutually supported.
# For now, send the full list to the server and have it error.
comps = [e.wireprotosupport().name for e in
util.compengines.supportedwireengines(util.CLIENTROLE)]
protoparams.append('comp=%s' % ','.join(comps))
if protoparams:
protoheaders = encodevalueinheaders(' '.join(protoparams),
'X-HgProto',
headersize or 1024)
for header, value in protoheaders:
headers[header] = value
varyheaders.append(header)
if varyheaders:
headers['Vary'] = ','.join(varyheaders)
req = self.requestbuilder(cu, data, headers)
if data is not None:
self.ui.debug("sending %s bytes\n" % size)
req.add_unredirected_header('Content-Length', '%d' % size)
try:
resp = self.urlopener.open(req)
except urlerr.httperror as inst:
if inst.code == 401:
raise error.Abort(_('authorization failed'))
raise
except httplib.HTTPException as inst:
self.ui.debug('http error while sending %s command\n' % cmd)
self.ui.traceback()
raise IOError(None, inst)
# Insert error handlers for common I/O failures.
_wraphttpresponse(resp)
# record the url we got redirected to
resp_url = resp.geturl()
if resp_url.endswith(qs):
resp_url = resp_url[:-len(qs)]
if self._url.rstrip('/') != resp_url.rstrip('/'):
if not self.ui.quiet:
self.ui.warn(_('real URL is %s\n') % resp_url)
self._url = resp_url
try:
proto = resp.getheader('content-type')
except AttributeError:
proto = resp.headers.get('content-type', '')
safeurl = util.hidepassword(self._url)
if proto.startswith('application/hg-error'):
raise error.OutOfBandError(resp.read())
# accept old "text/plain" and "application/hg-changegroup" for now
if not (proto.startswith('application/mercurial-') or
(proto.startswith('text/plain')
and not resp.headers.get('content-length')) or
proto.startswith('application/hg-changegroup')):
self.ui.debug("requested URL: '%s'\n" % util.hidepassword(cu))
raise error.RepoError(
_("'%s' does not appear to be an hg repository:\n"
"---%%<--- (%s)\n%s\n---%%<---\n")
% (safeurl, proto or 'no content-type', resp.read(1024)))
if proto.startswith('application/mercurial-'):
try:
version = proto.split('-', 1)[1]
version_info = tuple([int(n) for n in version.split('.')])
except ValueError:
raise error.RepoError(_("'%s' sent a broken Content-Type "
"header (%s)") % (safeurl, proto))
# TODO consider switching to a decompression reader that uses
# generators.
if version_info == (0, 1):
if _compressible:
return util.compengines['zlib'].decompressorreader(resp)
return resp
elif version_info == (0, 2):
# application/mercurial-0.2 always identifies the compression
# engine in the payload header.
elen = struct.unpack('B', resp.read(1))[0]
ename = resp.read(elen)
engine = util.compengines.forwiretype(ename)
return engine.decompressorreader(resp)
else:
raise error.RepoError(_("'%s' uses newer protocol %s") %
(safeurl, version))
if _compressible:
return util.compengines['zlib'].decompressorreader(resp)
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('unbundle')
try:
types = types.split(',')
except AttributeError:
# servers older than d1b16a746db6 will send 'unbundle' as a
# boolean capability. They only support headerless/uncompressed
# bundles.
types = [""]
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, "rb")
headers = {'Content-Type': 'application/mercurial-0.1'}
try:
r = self._call(cmd, data=fp, headers=headers, **args)
vals = r.split('\n', 1)
if len(vals) < 2:
raise error.ResponseError(_("unexpected response:"), r)
return vals
except socket.error as err:
if err.args[0] in (errno.ECONNRESET, errno.EPIPE):
raise error.Abort(_('push failed: %s') % err.args[1])
raise error.Abort(err.args[1])
finally:
fp.close()
os.unlink(tempname)
def _calltwowaystream(self, cmd, fp, **args):
fh = None
fp_ = None
filename = None
try:
# dump bundle to disk
fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg")
fh = os.fdopen(fd, pycompat.sysstr("wb"))
d = fp.read(4096)
while d:
fh.write(d)
d = fp.read(4096)
fh.close()
# start http push
fp_ = httpconnection.httpsendfile(self.ui, filename, "rb")
headers = {'Content-Type': 'application/mercurial-0.1'}
return self._callstream(cmd, data=fp_, headers=headers, **args)
finally:
if fp_ is not None:
fp_.close()
if fh is not None:
fh.close()
os.unlink(filename)
def _callcompressable(self, cmd, **args):
return self._callstream(cmd, _compressible=True, **args)
def _abort(self, exception):
raise exception
class httpspeer(httppeer):
def __init__(self, ui, path):
if not url.has_https:
raise error.Abort(_('Python support for SSL and HTTPS '
'is not installed'))
httppeer.__init__(self, ui, path)
def instance(ui, path, create):
if create:
raise error.Abort(_('cannot create new http repository'))
try:
if path.startswith('https:'):
inst = httpspeer(ui, path)
else:
inst = httppeer(ui, path)
try:
# Try to do useful work when checking compatibility.
# Usually saves a roundtrip since we want the caps anyway.
inst._fetchcaps()
except error.RepoError:
# No luck, try older compatibility check.
inst.between([(nullid, nullid)])
return inst
except error.RepoError as httpexception:
try:
r = statichttprepo.instance(ui, "static-" + path, create)
ui.note(_('(falling back to static-http)\n'))
return r
except error.RepoError:
raise httpexception # use the original http RepoError instead