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sapling/eden/scm/edenscm/mercurial/httppeer.py
Shannon Zhu 6ec7546cab Update pyre version for eden 
Summary: Automatic upgrade to remove `version` override and silence errors.

Reviewed By: grievejia

Differential Revision: D21207287

fbshipit-source-id: ab82cf81690cb847bd130ff3448345f5a0ea19af
2020-04-23 12:09:39 -07:00

495 lines
17 KiB
Python
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# Portions Copyright (c) Facebook, Inc. and its affiliates.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2.
# 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 io
import os
import socket
import struct
import tempfile
from . import bundle2, error, httpconnection, pycompat, url, util, wireproto
from .i18n import _
from .node import nullid
from .pycompat import range
# pyre-fixme[11]: Annotation `client` is not defined as a type.
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 as native strings.
"""
# HTTP Headers are ASCII. Python 3 requires them to be unicodes,
# not bytes. This function always takes bytes in as arguments.
fmt = header + r"-%s"
# Note: it is *NOT* a bug that the last bit here is a bytestring
# and not a unicode: we're just getting the encoded length anyway,
# and using an r-string to make it portable between Python 2 and 3
# doesn't work because then the \r is a literal backslash-r
# instead of a carriage return.
valuelen = limit - len(fmt % r"000") - len(": \r\n")
result = []
n = 0
for i in range(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 _multifile(object):
def __init__(self, *fileobjs):
for f in fileobjs:
if not util.safehasattr(f, "length"):
raise ValueError(
"_multifile only supports file objects that "
"have a length but this one does not:",
type(f),
f,
)
self._fileobjs = fileobjs
self._index = 0
@property
def length(self):
return sum(f.length for f in self._fileobjs)
def read(self, amt=None):
if amt <= 0:
return "".join(f.read() for f in self._fileobjs)
parts = []
while amt and self._index < len(self._fileobjs):
parts.append(self._fileobjs[self._index].read(amt))
got = len(parts[-1])
if got < amt:
self._index += 1
amt -= got
return "".join(parts)
def seek(self, offset, whence=os.SEEK_SET):
if whence != os.SEEK_SET:
raise NotImplementedError(
"_multifile does not support anything other"
" than os.SEEK_SET for whence on seek()"
)
if offset != 0:
raise NotImplementedError(
"_multifile only supports seeking to start, but that "
"could be fixed if you need it"
)
for f in self._fileobjs:
f.seek(0)
self._index = 0
class httppeer(wireproto.wirepeer):
def __init__(self, ui, path):
self._path = path
self._caps = 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
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)()
# Begin of _basepeer interface.
@util.propertycache
def ui(self):
return self._ui
def url(self):
return self._path
def local(self):
return None
def peer(self):
return self
def canpush(self):
return True
def close(self):
pass
# End of _basepeer interface.
# Begin of _basewirepeer interface.
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
# End of _basewirepeer interface.
# look up capabilities only when needed
def _fetchcaps(self):
self._caps = set(self._call("capabilities").split())
def _callstream(self, cmd, _compressible=False, **args):
args = 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
if postargsok and args:
strargs = urlreq.urlencode(sorted(args.items()))
if not data:
data = strargs
else:
if isinstance(data, bytes):
i = io.BytesIO(data)
i.length = len(data)
data = i
argsio = io.BytesIO(strargs)
argsio.length = len(strargs)
data = _multifile(argsio, data)
headers[r"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"):
headers[r"Expect"] = r"100-Continue"
headers[r"X-HgHttp2"] = r"1"
if data is not None and r"Content-Type" not in headers:
headers[r"Content-Type"] = r"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[r"Vary"] = r",".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(r"content-type", r"")
except AttributeError:
proto = resp.headers.get(r"content-type", r"")
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 = util.fdopen(fd, "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"))
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
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