http client: support persistent connections.
uses keepalive module from urlgrabber package. tested against "hg serve",
cgi server, and through http proxy. used ethereal to verify that only
one tcp connection used during entire "hg pull" sequence.
if server supports keepalive, this makes latency of "hg pull" much lower.
"""
changegroup.py - Mercurial changegroup manipulation functions
Copyright 2006 Matt Mackall <mpm@selenic.com>
This software may be used and distributed according to the terms
of the GNU General Public License, incorporated herein by reference.
"""
import struct
from i18n import gettext as _
from demandload import *
demandload(globals(), "util")
def getchunk(source):
"""get a chunk from a changegroup"""
d = source.read(4)
if not d:
return ""
l = struct.unpack(">l", d)[0]
if l <= 4:
return ""
d = source.read(l - 4)
if len(d) < l - 4:
raise util.Abort(_("premature EOF reading chunk"
" (got %d bytes, expected %d)")
% (len(d), l - 4))
return d
def chunkiter(source):
"""iterate through the chunks in source"""
while 1:
c = getchunk(source)
if not c:
break
yield c
def genchunk(data):
"""build a changegroup chunk"""
header = struct.pack(">l", len(data)+ 4)
return "%s%s" % (header, data)
def closechunk():
return struct.pack(">l", 0)