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httprepo: long arguments support (issue2126)...
httprepo: long arguments support (issue2126) Send the command arguments in the HTTP headers. The command is still part of the URL. If the server does not have the 'httpheader' capability, the client will send the command arguments in the URL as it did previously. Web servers typically allow more data to be placed within the headers than in the URL, so this approach will: - Avoid HTTP errors due to using a URL that is too large. - Allow Mercurial to implement a more efficient wire protocol. An alternate approach is to send the arguments as part of the request body. This approach has been rejected because it requires the use of POST requests, so it would break any existing configuration that relies on the request type for authentication or caching. Extensibility: - The header size is provided by the server, which makes it possible to introduce an hgrc setting for it. - The client ignores the capability value after the first comma, which allows more information to be included in the future.

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protocol.py
86 lines | 2.8 KiB | text/x-python | PythonLexer
#
# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>
# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import cgi, cStringIO, itertools, zlib, sys, urllib
from mercurial import util, wireproto
from common import HTTP_OK
HGTYPE = 'application/mercurial-0.1'
class webproto(object):
def __init__(self, req):
self.req = req
self.response = ''
def getargs(self, args):
knownargs = self._args()
data = {}
keys = args.split()
for k in keys:
if k == '*':
star = {}
for key in knownargs.keys():
if key != 'cmd' and key not in keys:
star[key] = knownargs[key][0]
data['*'] = star
else:
data[k] = knownargs[k][0]
return [data[k] for k in keys]
def _args(self):
args = self.req.form.copy()
chunks = []
for i in itertools.count(1):
h = self.req.env.get('HTTP_X_ARG_' + str(i))
if h is None:
break
chunks += [h]
args.update(cgi.parse_qs(''.join(chunks), keep_blank_values=True))
return args
def getfile(self, fp):
length = int(self.req.env['CONTENT_LENGTH'])
for s in util.filechunkiter(self.req, limit=length):
fp.write(s)
def redirect(self):
self.oldio = sys.stdout, sys.stderr
sys.stderr = sys.stdout = cStringIO.StringIO()
def groupchunks(self, cg):
z = zlib.compressobj()
while 1:
chunk = cg.read(4096)
if not chunk:
break
yield z.compress(chunk)
yield z.flush()
def _client(self):
return 'remote:%s:%s:%s' % (
self.req.env.get('wsgi.url_scheme') or 'http',
urllib.quote(self.req.env.get('REMOTE_HOST', '')),
urllib.quote(self.req.env.get('REMOTE_USER', '')))
def iscmd(cmd):
return cmd in wireproto.commands
def call(repo, req, cmd):
p = webproto(req)
rsp = wireproto.dispatch(repo, p, cmd)
if isinstance(rsp, str):
req.respond(HTTP_OK, HGTYPE, length=len(rsp))
return [rsp]
elif isinstance(rsp, wireproto.streamres):
req.respond(HTTP_OK, HGTYPE)
return rsp.gen
elif isinstance(rsp, wireproto.pushres):
val = sys.stdout.getvalue()
sys.stdout, sys.stderr = p.oldio
req.respond(HTTP_OK, HGTYPE)
return ['%d\n%s' % (rsp.res, val)]
elif isinstance(rsp, wireproto.pusherr):
# drain the incoming bundle
req.drain()
sys.stdout, sys.stderr = p.oldio
rsp = '0\n%s\n' % rsp.res
req.respond(HTTP_OK, HGTYPE, length=len(rsp))
return [rsp]