bundle2: support for bundling and unbundling payload
We add the ability to bundle and unbundle a payload in parts. The payload is the
actual binary data of the part. It is used to convey all the applicative data.
For now we stick to very simple implementation with all the data fit in single
chunk. This open the door to some bundle2 testing usage. This will be improved before
bundle2 get used for real. We need to be able to stream the payload in multiple
part to exchange any changegroup efficiently. This simple version will do for
now.
Bundling and unbundling are done in the same changeset because the test for
parts is less modular. However, the result is not too complex.
# sshpeer.py - ssh repository proxy class for mercurial
#
# Copyright 2005, 2006 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 re
from i18n import _
import util, error, wireproto
class remotelock(object):
def __init__(self, repo):
self.repo = repo
def release(self):
self.repo.unlock()
self.repo = None
def __del__(self):
if self.repo:
self.release()
def _serverquote(s):
'''quote a string for the remote shell ... which we assume is sh'''
if re.match('[a-zA-Z0-9@%_+=:,./-]*$', s):
return s
return "'%s'" % s.replace("'", "'\\''")
class sshpeer(wireproto.wirepeer):
def __init__(self, ui, path, create=False):
self._url = path
self.ui = ui
self.pipeo = self.pipei = self.pipee = None
u = util.url(path, parsequery=False, parsefragment=False)
if u.scheme != 'ssh' or not u.host or u.path is None:
self._abort(error.RepoError(_("couldn't parse location %s") % path))
self.user = u.user
if u.passwd is not None:
self._abort(error.RepoError(_("password in URL not supported")))
self.host = u.host
self.port = u.port
self.path = u.path or "."
sshcmd = self.ui.config("ui", "ssh", "ssh")
remotecmd = self.ui.config("ui", "remotecmd", "hg")
args = util.sshargs(sshcmd, self.host, self.user, self.port)
if create:
cmd = '%s %s %s' % (sshcmd, args,
util.shellquote("%s init %s" %
(_serverquote(remotecmd), _serverquote(self.path))))
ui.debug('running %s\n' % cmd)
res = util.system(cmd)
if res != 0:
self._abort(error.RepoError(_("could not create remote repo")))
self._validaterepo(sshcmd, args, remotecmd)
def url(self):
return self._url
def _validaterepo(self, sshcmd, args, remotecmd):
# cleanup up previous run
self.cleanup()
cmd = '%s %s %s' % (sshcmd, args,
util.shellquote("%s -R %s serve --stdio" %
(_serverquote(remotecmd), _serverquote(self.path))))
self.ui.debug('running %s\n' % cmd)
cmd = util.quotecommand(cmd)
# while self.subprocess isn't used, having it allows the subprocess to
# to clean up correctly later
self.pipeo, self.pipei, self.pipee, self.subprocess = util.popen4(cmd)
# skip any noise generated by remote shell
self._callstream("hello")
r = self._callstream("between", pairs=("%s-%s" % ("0"*40, "0"*40)))
lines = ["", "dummy"]
max_noise = 500
while lines[-1] and max_noise:
l = r.readline()
self.readerr()
if lines[-1] == "1\n" and l == "\n":
break
if l:
self.ui.debug("remote: ", l)
lines.append(l)
max_noise -= 1
else:
self._abort(error.RepoError(_('no suitable response from '
'remote hg')))
self._caps = set()
for l in reversed(lines):
if l.startswith("capabilities:"):
self._caps.update(l[:-1].split(":")[1].split())
break
def _capabilities(self):
return self._caps
def readerr(self):
while True:
size = util.fstat(self.pipee).st_size
if size == 0:
break
s = self.pipee.read(size)
if not s:
break
for l in s.splitlines():
self.ui.status(_("remote: "), l, '\n')
def _abort(self, exception):
self.cleanup()
raise exception
def cleanup(self):
if self.pipeo is None:
return
self.pipeo.close()
self.pipei.close()
try:
# read the error descriptor until EOF
for l in self.pipee:
self.ui.status(_("remote: "), l)
except (IOError, ValueError):
pass
self.pipee.close()
__del__ = cleanup
def _callstream(self, cmd, **args):
self.ui.debug("sending %s command\n" % cmd)
self.pipeo.write("%s\n" % cmd)
_func, names = wireproto.commands[cmd]
keys = names.split()
wireargs = {}
for k in keys:
if k == '*':
wireargs['*'] = args
break
else:
wireargs[k] = args[k]
del args[k]
for k, v in sorted(wireargs.iteritems()):
self.pipeo.write("%s %d\n" % (k, len(v)))
if isinstance(v, dict):
for dk, dv in v.iteritems():
self.pipeo.write("%s %d\n" % (dk, len(dv)))
self.pipeo.write(dv)
else:
self.pipeo.write(v)
self.pipeo.flush()
return self.pipei
def _call(self, cmd, **args):
self._callstream(cmd, **args)
return self._recv()
def _callpush(self, cmd, fp, **args):
r = self._call(cmd, **args)
if r:
return '', r
while True:
d = fp.read(4096)
if not d:
break
self._send(d)
self._send("", flush=True)
r = self._recv()
if r:
return '', r
return self._recv(), ''
def _decompress(self, stream):
return stream
def _recv(self):
l = self.pipei.readline()
if l == '\n':
err = []
while True:
line = self.pipee.readline()
if line == '-\n':
break
err.extend([line])
if len(err) > 0:
# strip the trailing newline added to the last line server-side
err[-1] = err[-1][:-1]
self._abort(error.OutOfBandError(*err))
self.readerr()
try:
l = int(l)
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"), l))
return self.pipei.read(l)
def _send(self, data, flush=False):
self.pipeo.write("%d\n" % len(data))
if data:
self.pipeo.write(data)
if flush:
self.pipeo.flush()
self.readerr()
def lock(self):
self._call("lock")
return remotelock(self)
def unlock(self):
self._call("unlock")
def addchangegroup(self, cg, source, url, lock=None):
'''Send a changegroup to the remote server. Return an integer
similar to unbundle(). DEPRECATED, since it requires locking the
remote.'''
d = self._call("addchangegroup")
if d:
self._abort(error.RepoError(_("push refused: %s") % d))
while True:
d = cg.read(4096)
if not d:
break
self.pipeo.write(d)
self.readerr()
self.pipeo.flush()
self.readerr()
r = self._recv()
if not r:
return 1
try:
return int(r)
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"), r))
instance = sshpeer