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# wireprotov1peer.py - Client-side functionality for wire protocol version 1.
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#
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# Copyright 2005-2010 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import hashlib
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import sys
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import weakref
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from .i18n import _
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from .node import (
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bin,
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)
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from . import (
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bundle2,
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changegroup as changegroupmod,
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encoding,
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error,
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pushkey as pushkeymod,
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pycompat,
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repository,
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util,
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wireprototypes,
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)
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from .utils import (
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interfaceutil,
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)
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urlreq = util.urlreq
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def batchable(f):
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'''annotation for batchable methods
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Such methods must implement a coroutine as follows:
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@batchable
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def sample(self, one, two=None):
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# Build list of encoded arguments suitable for your wire protocol:
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encargs = [('one', encode(one),), ('two', encode(two),)]
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# Create future for injection of encoded result:
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encresref = future()
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# Return encoded arguments and future:
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yield encargs, encresref
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# Assuming the future to be filled with the result from the batched
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# request now. Decode it:
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yield decode(encresref.value)
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The decorator returns a function which wraps this coroutine as a plain
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method, but adds the original method as an attribute called "batchable",
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which is used by remotebatch to split the call into separate encoding and
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decoding phases.
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'''
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def plain(*args, **opts):
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batchable = f(*args, **opts)
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encargsorres, encresref = next(batchable)
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if not encresref:
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return encargsorres # a local result in this case
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self = args[0]
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cmd = pycompat.bytesurl(f.__name__) # ensure cmd is ascii bytestr
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encresref.set(self._submitone(cmd, encargsorres))
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return next(batchable)
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setattr(plain, 'batchable', f)
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return plain
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class future(object):
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'''placeholder for a value to be set later'''
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def set(self, value):
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if util.safehasattr(self, 'value'):
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raise error.RepoError("future is already set")
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self.value = value
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def encodebatchcmds(req):
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"""Return a ``cmds`` argument value for the ``batch`` command."""
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escapearg = wireprototypes.escapebatcharg
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cmds = []
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for op, argsdict in req:
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# Old servers didn't properly unescape argument names. So prevent
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# the sending of argument names that may not be decoded properly by
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# servers.
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assert all(escapearg(k) == k for k in argsdict)
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args = ','.join('%s=%s' % (escapearg(k), escapearg(v))
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for k, v in argsdict.iteritems())
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cmds.append('%s %s' % (op, args))
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return ';'.join(cmds)
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class unsentfuture(pycompat.futures.Future):
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"""A Future variation to represent an unsent command.
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Because we buffer commands and don't submit them immediately, calling
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``result()`` on an unsent future could deadlock. Futures for buffered
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commands are represented by this type, which wraps ``result()`` to
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call ``sendcommands()``.
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"""
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def result(self, timeout=None):
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if self.done():
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return pycompat.futures.Future.result(self, timeout)
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self._peerexecutor.sendcommands()
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# This looks like it will infinitely recurse. However,
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# sendcommands() should modify __class__. This call serves as a check
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# on that.
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return self.result(timeout)
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@interfaceutil.implementer(repository.ipeercommandexecutor)
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class peerexecutor(object):
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def __init__(self, peer):
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self._peer = peer
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self._sent = False
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self._closed = False
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self._calls = []
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self._futures = weakref.WeakSet()
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self._responseexecutor = None
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self._responsef = None
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def __enter__(self):
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return self
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def __exit__(self, exctype, excvalee, exctb):
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self.close()
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def callcommand(self, command, args):
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if self._sent:
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raise error.ProgrammingError('callcommand() cannot be used '
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'after commands are sent')
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if self._closed:
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raise error.ProgrammingError('callcommand() cannot be used '
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'after close()')
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# Commands are dispatched through methods on the peer.
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fn = getattr(self._peer, pycompat.sysstr(command), None)
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if not fn:
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raise error.ProgrammingError(
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'cannot call command %s: method of same name not available '
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'on peer' % command)
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# Commands are either batchable or they aren't. If a command
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# isn't batchable, we send it immediately because the executor
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# can no longer accept new commands after a non-batchable command.
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# If a command is batchable, we queue it for later. But we have
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# to account for the case of a non-batchable command arriving after
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# a batchable one and refuse to service it.
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def addcall():
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f = pycompat.futures.Future()
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self._futures.add(f)
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self._calls.append((command, args, fn, f))
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return f
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if getattr(fn, 'batchable', False):
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f = addcall()
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# But since we don't issue it immediately, we wrap its result()
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# to trigger sending so we avoid deadlocks.
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f.__class__ = unsentfuture
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f._peerexecutor = self
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else:
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if self._calls:
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raise error.ProgrammingError(
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'%s is not batchable and cannot be called on a command '
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'executor along with other commands' % command)
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f = addcall()
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# Non-batchable commands can never coexist with another command
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# in this executor. So send the command immediately.
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self.sendcommands()
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return f
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def sendcommands(self):
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if self._sent:
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return
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if not self._calls:
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return
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self._sent = True
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# Unhack any future types so caller seens a clean type and to break
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# cycle between us and futures.
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for f in self._futures:
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if isinstance(f, unsentfuture):
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f.__class__ = pycompat.futures.Future
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f._peerexecutor = None
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calls = self._calls
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# Mainly to destroy references to futures.
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self._calls = None
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# Simple case of a single command. We call it synchronously.
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if len(calls) == 1:
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command, args, fn, f = calls[0]
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# Future was cancelled. Ignore it.
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if not f.set_running_or_notify_cancel():
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return
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try:
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result = fn(**pycompat.strkwargs(args))
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except Exception:
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pycompat.future_set_exception_info(f, sys.exc_info()[1:])
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else:
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f.set_result(result)
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return
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# Batch commands are a bit harder. First, we have to deal with the
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# @batchable coroutine. That's a bit annoying. Furthermore, we also
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# need to preserve streaming. i.e. it should be possible for the
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# futures to resolve as data is coming in off the wire without having
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# to wait for the final byte of the final response. We do this by
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# spinning up a thread to read the responses.
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requests = []
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states = []
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for command, args, fn, f in calls:
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# Future was cancelled. Ignore it.
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if not f.set_running_or_notify_cancel():
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continue
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try:
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batchable = fn.batchable(fn.__self__,
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**pycompat.strkwargs(args))
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except Exception:
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pycompat.future_set_exception_info(f, sys.exc_info()[1:])
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return
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# Encoded arguments and future holding remote result.
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try:
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encodedargs, fremote = next(batchable)
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except Exception:
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pycompat.future_set_exception_info(f, sys.exc_info()[1:])
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return
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requests.append((command, encodedargs))
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states.append((command, f, batchable, fremote))
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if not requests:
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return
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# This will emit responses in order they were executed.
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wireresults = self._peer._submitbatch(requests)
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# The use of a thread pool executor here is a bit weird for something
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# that only spins up a single thread. However, thread management is
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# hard and it is easy to encounter race conditions, deadlocks, etc.
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# concurrent.futures already solves these problems and its thread pool
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# executor has minimal overhead. So we use it.
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self._responseexecutor = pycompat.futures.ThreadPoolExecutor(1)
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self._responsef = self._responseexecutor.submit(self._readbatchresponse,
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states, wireresults)
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def close(self):
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self.sendcommands()
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if self._closed:
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return
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self._closed = True
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if not self._responsef:
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return
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# We need to wait on our in-flight response and then shut down the
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# executor once we have a result.
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try:
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self._responsef.result()
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finally:
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self._responseexecutor.shutdown(wait=True)
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self._responsef = None
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self._responseexecutor = None
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# If any of our futures are still in progress, mark them as
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# errored. Otherwise a result() could wait indefinitely.
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for f in self._futures:
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if not f.done():
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f.set_exception(error.ResponseError(
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_('unfulfilled batch command response')))
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self._futures = None
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def _readbatchresponse(self, states, wireresults):
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# Executes in a thread to read data off the wire.
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for command, f, batchable, fremote in states:
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# Grab raw result off the wire and teach the internal future
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# about it.
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remoteresult = next(wireresults)
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fremote.set(remoteresult)
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# And ask the coroutine to decode that value.
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try:
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result = next(batchable)
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except Exception:
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pycompat.future_set_exception_info(f, sys.exc_info()[1:])
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else:
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f.set_result(result)
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@interfaceutil.implementer(repository.ipeercommands,
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repository.ipeerlegacycommands)
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class wirepeer(repository.peer):
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"""Client-side interface for communicating with a peer repository.
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Methods commonly call wire protocol commands of the same name.
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See also httppeer.py and sshpeer.py for protocol-specific
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implementations of this interface.
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"""
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def commandexecutor(self):
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return peerexecutor(self)
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# Begin of ipeercommands interface.
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def clonebundles(self):
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self.requirecap('clonebundles', _('clone bundles'))
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return self._call('clonebundles')
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@batchable
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def lookup(self, key):
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self.requirecap('lookup', _('look up remote revision'))
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f = future()
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yield {'key': encoding.fromlocal(key)}, f
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d = f.value
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success, data = d[:-1].split(" ", 1)
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if int(success):
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yield bin(data)
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else:
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self._abort(error.RepoError(data))
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@batchable
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def heads(self):
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f = future()
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yield {}, f
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d = f.value
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try:
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yield wireprototypes.decodelist(d[:-1])
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except ValueError:
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self._abort(error.ResponseError(_("unexpected response:"), d))
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@batchable
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def known(self, nodes):
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f = future()
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yield {'nodes': wireprototypes.encodelist(nodes)}, f
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d = f.value
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try:
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yield [bool(int(b)) for b in d]
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except ValueError:
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self._abort(error.ResponseError(_("unexpected response:"), d))
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@batchable
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def branchmap(self):
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f = future()
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yield {}, f
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d = f.value
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try:
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branchmap = {}
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for branchpart in d.splitlines():
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branchname, branchheads = branchpart.split(' ', 1)
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branchname = encoding.tolocal(urlreq.unquote(branchname))
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branchheads = wireprototypes.decodelist(branchheads)
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branchmap[branchname] = branchheads
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yield branchmap
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except TypeError:
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self._abort(error.ResponseError(_("unexpected response:"), d))
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@batchable
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def listkeys(self, namespace):
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if not self.capable('pushkey'):
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yield {}, None
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f = future()
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self.ui.debug('preparing listkeys for "%s"\n' % namespace)
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yield {'namespace': encoding.fromlocal(namespace)}, f
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d = f.value
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self.ui.debug('received listkey for "%s": %i bytes\n'
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% (namespace, len(d)))
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yield pushkeymod.decodekeys(d)
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@batchable
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def pushkey(self, namespace, key, old, new):
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if not self.capable('pushkey'):
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yield False, None
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f = future()
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self.ui.debug('preparing pushkey for "%s:%s"\n' % (namespace, key))
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yield {'namespace': encoding.fromlocal(namespace),
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'key': encoding.fromlocal(key),
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'old': encoding.fromlocal(old),
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'new': encoding.fromlocal(new)}, f
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d = f.value
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d, output = d.split('\n', 1)
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try:
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d = bool(int(d))
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except ValueError:
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raise error.ResponseError(
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_('push failed (unexpected response):'), d)
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for l in output.splitlines(True):
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self.ui.status(_('remote: '), l)
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yield d
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def stream_out(self):
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return self._callstream('stream_out')
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def getbundle(self, source, **kwargs):
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kwargs = pycompat.byteskwargs(kwargs)
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self.requirecap('getbundle', _('look up remote changes'))
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opts = {}
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bundlecaps = kwargs.get('bundlecaps') or set()
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for key, value in kwargs.iteritems():
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if value is None:
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continue
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keytype = wireprototypes.GETBUNDLE_ARGUMENTS.get(key)
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if keytype is None:
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raise error.ProgrammingError(
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'Unexpectedly None keytype for key %s' % key)
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elif keytype == 'nodes':
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value = wireprototypes.encodelist(value)
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elif keytype == 'csv':
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value = ','.join(value)
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elif keytype == 'scsv':
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value = ','.join(sorted(value))
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elif keytype == 'boolean':
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value = '%i' % bool(value)
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elif keytype != 'plain':
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raise KeyError('unknown getbundle option type %s'
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% keytype)
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opts[key] = value
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f = self._callcompressable("getbundle", **pycompat.strkwargs(opts))
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if any((cap.startswith('HG2') for cap in bundlecaps)):
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return bundle2.getunbundler(self.ui, f)
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else:
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return changegroupmod.cg1unpacker(f, 'UN')
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def unbundle(self, bundle, heads, url):
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'''Send cg (a readable file-like object representing the
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changegroup to push, typically a chunkbuffer object) to the
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remote server as a bundle.
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When pushing a bundle10 stream, return an integer indicating the
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result of the push (see changegroup.apply()).
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When pushing a bundle20 stream, return a bundle20 stream.
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`url` is the url the client thinks it's pushing to, which is
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|
|
visible to hooks.
|
|
|
'''
|
|
|
|
|
|
if heads != ['force'] and self.capable('unbundlehash'):
|
|
|
heads = wireprototypes.encodelist(
|
|
|
['hashed', hashlib.sha1(''.join(sorted(heads))).digest()])
|
|
|
else:
|
|
|
heads = wireprototypes.encodelist(heads)
|
|
|
|
|
|
if util.safehasattr(bundle, 'deltaheader'):
|
|
|
# this a bundle10, do the old style call sequence
|
|
|
ret, output = self._callpush("unbundle", bundle, heads=heads)
|
|
|
if ret == "":
|
|
|
raise error.ResponseError(
|
|
|
_('push failed:'), output)
|
|
|
try:
|
|
|
ret = int(ret)
|
|
|
except ValueError:
|
|
|
raise error.ResponseError(
|
|
|
_('push failed (unexpected response):'), ret)
|
|
|
|
|
|
for l in output.splitlines(True):
|
|
|
self.ui.status(_('remote: '), l)
|
|
|
else:
|
|
|
# bundle2 push. Send a stream, fetch a stream.
|
|
|
stream = self._calltwowaystream('unbundle', bundle, heads=heads)
|
|
|
ret = bundle2.getunbundler(self.ui, stream)
|
|
|
return ret
|
|
|
|
|
|
# End of ipeercommands interface.
|
|
|
|
|
|
# Begin of ipeerlegacycommands interface.
|
|
|
|
|
|
def branches(self, nodes):
|
|
|
n = wireprototypes.encodelist(nodes)
|
|
|
d = self._call("branches", nodes=n)
|
|
|
try:
|
|
|
br = [tuple(wireprototypes.decodelist(b)) for b in d.splitlines()]
|
|
|
return br
|
|
|
except ValueError:
|
|
|
self._abort(error.ResponseError(_("unexpected response:"), d))
|
|
|
|
|
|
def between(self, pairs):
|
|
|
batch = 8 # avoid giant requests
|
|
|
r = []
|
|
|
for i in xrange(0, len(pairs), batch):
|
|
|
n = " ".join([wireprototypes.encodelist(p, '-')
|
|
|
for p in pairs[i:i + batch]])
|
|
|
d = self._call("between", pairs=n)
|
|
|
try:
|
|
|
r.extend(l and wireprototypes.decodelist(l) or []
|
|
|
for l in d.splitlines())
|
|
|
except ValueError:
|
|
|
self._abort(error.ResponseError(_("unexpected response:"), d))
|
|
|
return r
|
|
|
|
|
|
def changegroup(self, nodes, source):
|
|
|
n = wireprototypes.encodelist(nodes)
|
|
|
f = self._callcompressable("changegroup", roots=n)
|
|
|
return changegroupmod.cg1unpacker(f, 'UN')
|
|
|
|
|
|
def changegroupsubset(self, bases, heads, source):
|
|
|
self.requirecap('changegroupsubset', _('look up remote changes'))
|
|
|
bases = wireprototypes.encodelist(bases)
|
|
|
heads = wireprototypes.encodelist(heads)
|
|
|
f = self._callcompressable("changegroupsubset",
|
|
|
bases=bases, heads=heads)
|
|
|
return changegroupmod.cg1unpacker(f, 'UN')
|
|
|
|
|
|
# End of ipeerlegacycommands interface.
|
|
|
|
|
|
def _submitbatch(self, req):
|
|
|
"""run batch request <req> on the server
|
|
|
|
|
|
Returns an iterator of the raw responses from the server.
|
|
|
"""
|
|
|
ui = self.ui
|
|
|
if ui.debugflag and ui.configbool('devel', 'debug.peer-request'):
|
|
|
ui.debug('devel-peer-request: batched-content\n')
|
|
|
for op, args in req:
|
|
|
msg = 'devel-peer-request: - %s (%d arguments)\n'
|
|
|
ui.debug(msg % (op, len(args)))
|
|
|
|
|
|
unescapearg = wireprototypes.unescapebatcharg
|
|
|
|
|
|
rsp = self._callstream("batch", cmds=encodebatchcmds(req))
|
|
|
chunk = rsp.read(1024)
|
|
|
work = [chunk]
|
|
|
while chunk:
|
|
|
while ';' not in chunk and chunk:
|
|
|
chunk = rsp.read(1024)
|
|
|
work.append(chunk)
|
|
|
merged = ''.join(work)
|
|
|
while ';' in merged:
|
|
|
one, merged = merged.split(';', 1)
|
|
|
yield unescapearg(one)
|
|
|
chunk = rsp.read(1024)
|
|
|
work = [merged, chunk]
|
|
|
yield unescapearg(''.join(work))
|
|
|
|
|
|
def _submitone(self, op, args):
|
|
|
return self._call(op, **pycompat.strkwargs(args))
|
|
|
|
|
|
def debugwireargs(self, one, two, three=None, four=None, five=None):
|
|
|
# don't pass optional arguments left at their default value
|
|
|
opts = {}
|
|
|
if three is not None:
|
|
|
opts[r'three'] = three
|
|
|
if four is not None:
|
|
|
opts[r'four'] = four
|
|
|
return self._call('debugwireargs', one=one, two=two, **opts)
|
|
|
|
|
|
def _call(self, cmd, **args):
|
|
|
"""execute <cmd> on the server
|
|
|
|
|
|
The command is expected to return a simple string.
|
|
|
|
|
|
returns the server reply as a string."""
|
|
|
raise NotImplementedError()
|
|
|
|
|
|
def _callstream(self, cmd, **args):
|
|
|
"""execute <cmd> on the server
|
|
|
|
|
|
The command is expected to return a stream. Note that if the
|
|
|
command doesn't return a stream, _callstream behaves
|
|
|
differently for ssh and http peers.
|
|
|
|
|
|
returns the server reply as a file like object.
|
|
|
"""
|
|
|
raise NotImplementedError()
|
|
|
|
|
|
def _callcompressable(self, cmd, **args):
|
|
|
"""execute <cmd> on the server
|
|
|
|
|
|
The command is expected to return a stream.
|
|
|
|
|
|
The stream may have been compressed in some implementations. This
|
|
|
function takes care of the decompression. This is the only difference
|
|
|
with _callstream.
|
|
|
|
|
|
returns the server reply as a file like object.
|
|
|
"""
|
|
|
raise NotImplementedError()
|
|
|
|
|
|
def _callpush(self, cmd, fp, **args):
|
|
|
"""execute a <cmd> on server
|
|
|
|
|
|
The command is expected to be related to a push. Push has a special
|
|
|
return method.
|
|
|
|
|
|
returns the server reply as a (ret, output) tuple. ret is either
|
|
|
empty (error) or a stringified int.
|
|
|
"""
|
|
|
raise NotImplementedError()
|
|
|
|
|
|
def _calltwowaystream(self, cmd, fp, **args):
|
|
|
"""execute <cmd> on server
|
|
|
|
|
|
The command will send a stream to the server and get a stream in reply.
|
|
|
"""
|
|
|
raise NotImplementedError()
|
|
|
|
|
|
def _abort(self, exception):
|
|
|
"""clearly abort the wire protocol connection and raise the exception
|
|
|
"""
|
|
|
raise NotImplementedError()
|
|
|
|
