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# wireprotov2peer.py - client side code for wire protocol version 2
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#
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# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.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 threading
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from .i18n import _
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from . import (
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encoding,
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error,
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pycompat,
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sslutil,
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url as urlmod,
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util,
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wireprotoframing,
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wireprototypes,
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)
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from .utils import (
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cborutil,
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)
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def formatrichmessage(atoms):
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"""Format an encoded message from the framing protocol."""
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chunks = []
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for atom in atoms:
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msg = _(atom[b'msg'])
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if b'args' in atom:
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msg = msg % tuple(atom[b'args'])
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chunks.append(msg)
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return b''.join(chunks)
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SUPPORTED_REDIRECT_PROTOCOLS = {
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b'http',
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b'https',
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}
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SUPPORTED_CONTENT_HASHES = {
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b'sha1',
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b'sha256',
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}
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def redirecttargetsupported(ui, target):
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"""Determine whether a redirect target entry is supported.
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``target`` should come from the capabilities data structure emitted by
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the server.
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"""
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if target.get(b'protocol') not in SUPPORTED_REDIRECT_PROTOCOLS:
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ui.note(_('(remote redirect target %s uses unsupported protocol: %s)\n')
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% (target[b'name'], target.get(b'protocol', b'')))
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return False
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if target.get(b'snirequired') and not sslutil.hassni:
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ui.note(_('(redirect target %s requires SNI, which is unsupported)\n') %
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target[b'name'])
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return False
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if b'tlsversions' in target:
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tlsversions = set(target[b'tlsversions'])
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supported = set()
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for v in sslutil.supportedprotocols:
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assert v.startswith(b'tls')
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supported.add(v[3:])
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if not tlsversions & supported:
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ui.note(_('(remote redirect target %s requires unsupported TLS '
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'versions: %s)\n') % (
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target[b'name'], b', '.join(sorted(tlsversions))))
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return False
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ui.note(_('(remote redirect target %s is compatible)\n') % target[b'name'])
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return True
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def supportedredirects(ui, apidescriptor):
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"""Resolve the "redirect" command request key given an API descriptor.
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Given an API descriptor returned by the server, returns a data structure
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that can be used in hte "redirect" field of command requests to advertise
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support for compatible redirect targets.
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Returns None if no redirect targets are remotely advertised or if none are
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supported.
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"""
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if not apidescriptor or b'redirect' not in apidescriptor:
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return None
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targets = [t[b'name'] for t in apidescriptor[b'redirect'][b'targets']
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if redirecttargetsupported(ui, t)]
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hashes = [h for h in apidescriptor[b'redirect'][b'hashes']
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if h in SUPPORTED_CONTENT_HASHES]
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return {
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b'targets': targets,
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b'hashes': hashes,
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}
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class commandresponse(object):
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"""Represents the response to a command request.
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Instances track the state of the command and hold its results.
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An external entity is required to update the state of the object when
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events occur.
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"""
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def __init__(self, requestid, command, fromredirect=False):
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self.requestid = requestid
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self.command = command
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self.fromredirect = fromredirect
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# Whether all remote input related to this command has been
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# received.
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self._inputcomplete = False
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# We have a lock that is acquired when important object state is
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# mutated. This is to prevent race conditions between 1 thread
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# sending us new data and another consuming it.
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self._lock = threading.RLock()
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# An event is set when state of the object changes. This event
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# is waited on by the generator emitting objects.
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self._serviceable = threading.Event()
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self._pendingevents = []
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self._pendingerror = None
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self._decoder = cborutil.bufferingdecoder()
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self._seeninitial = False
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self._redirect = None
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def _oninputcomplete(self):
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with self._lock:
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self._inputcomplete = True
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self._serviceable.set()
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def _onresponsedata(self, data):
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available, readcount, wanted = self._decoder.decode(data)
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if not available:
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return
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with self._lock:
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for o in self._decoder.getavailable():
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if not self._seeninitial and not self.fromredirect:
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self._handleinitial(o)
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continue
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# We should never see an object after a content redirect,
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# as the spec says the main status object containing the
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# content redirect is the only object in the stream. Fail
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# if we see a misbehaving server.
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if self._redirect:
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raise error.Abort(_('received unexpected response data '
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'after content redirect; the remote is '
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'buggy'))
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self._pendingevents.append(o)
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self._serviceable.set()
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def _onerror(self, e):
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self._pendingerror = e
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with self._lock:
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self._serviceable.set()
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def _handleinitial(self, o):
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self._seeninitial = True
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if o[b'status'] == b'ok':
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return
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elif o[b'status'] == b'redirect':
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l = o[b'location']
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self._redirect = wireprototypes.alternatelocationresponse(
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url=l[b'url'],
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mediatype=l[b'mediatype'],
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size=l.get(b'size'),
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fullhashes=l.get(b'fullhashes'),
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fullhashseed=l.get(b'fullhashseed'),
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serverdercerts=l.get(b'serverdercerts'),
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servercadercerts=l.get(b'servercadercerts'))
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return
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atoms = [{'msg': o[b'error'][b'message']}]
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if b'args' in o[b'error']:
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atoms[0]['args'] = o[b'error'][b'args']
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raise error.RepoError(formatrichmessage(atoms))
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def objects(self):
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"""Obtained decoded objects from this response.
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This is a generator of data structures that were decoded from the
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command response.
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Obtaining the next member of the generator may block due to waiting
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on external data to become available.
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If the server encountered an error in the middle of serving the data
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or if another error occurred, an exception may be raised when
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advancing the generator.
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"""
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while True:
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# TODO this can infinite loop if self._inputcomplete is never
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# set. We likely want to tie the lifetime of this object/state
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# to that of the background thread receiving frames and updating
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# our state.
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self._serviceable.wait(1.0)
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if self._pendingerror:
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raise self._pendingerror
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with self._lock:
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self._serviceable.clear()
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# Make copies because objects could be mutated during
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# iteration.
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stop = self._inputcomplete
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pending = list(self._pendingevents)
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self._pendingevents[:] = []
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for o in pending:
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yield o
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if stop:
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break
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class clienthandler(object):
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"""Object to handle higher-level client activities.
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The ``clientreactor`` is used to hold low-level state about the frame-based
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protocol, such as which requests and streams are active. This type is used
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for higher-level operations, such as reading frames from a socket, exposing
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and managing a higher-level primitive for representing command responses,
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etc. This class is what peers should probably use to bridge wire activity
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with the higher-level peer API.
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"""
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def __init__(self, ui, clientreactor, opener=None,
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requestbuilder=util.urlreq.request):
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self._ui = ui
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self._reactor = clientreactor
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self._requests = {}
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self._futures = {}
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self._responses = {}
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self._redirects = []
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self._frameseof = False
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self._opener = opener or urlmod.opener(ui)
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self._requestbuilder = requestbuilder
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def callcommand(self, command, args, f, redirect=None):
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"""Register a request to call a command.
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Returns an iterable of frames that should be sent over the wire.
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"""
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request, action, meta = self._reactor.callcommand(command, args,
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redirect=redirect)
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if action != 'noop':
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raise error.ProgrammingError('%s not yet supported' % action)
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rid = request.requestid
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self._requests[rid] = request
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self._futures[rid] = f
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# TODO we need some kind of lifetime on response instances otherwise
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# objects() may deadlock.
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self._responses[rid] = commandresponse(rid, command)
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return iter(())
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def flushcommands(self):
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"""Flush all queued commands.
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Returns an iterable of frames that should be sent over the wire.
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"""
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action, meta = self._reactor.flushcommands()
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if action != 'sendframes':
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raise error.ProgrammingError('%s not yet supported' % action)
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return meta['framegen']
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def readdata(self, framefh):
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"""Attempt to read data and do work.
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Returns None if no data was read. Presumably this means we're
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done with all read I/O.
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"""
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if not self._frameseof:
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frame = wireprotoframing.readframe(framefh)
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if frame is None:
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# TODO tell reactor?
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self._frameseof = True
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else:
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self._ui.debug('received %r\n' % frame)
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self._processframe(frame)
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# Also try to read the first redirect.
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if self._redirects:
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if not self._processredirect(*self._redirects[0]):
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self._redirects.pop(0)
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if self._frameseof and not self._redirects:
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return None
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return True
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def _processframe(self, frame):
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"""Process a single read frame."""
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action, meta = self._reactor.onframerecv(frame)
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if action == 'error':
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e = error.RepoError(meta['message'])
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if frame.requestid in self._responses:
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self._responses[frame.requestid]._oninputcomplete()
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if frame.requestid in self._futures:
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self._futures[frame.requestid].set_exception(e)
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del self._futures[frame.requestid]
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else:
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raise e
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return
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elif action == 'noop':
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return
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elif action == 'responsedata':
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# Handled below.
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pass
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else:
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raise error.ProgrammingError('action not handled: %s' % action)
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if frame.requestid not in self._requests:
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raise error.ProgrammingError(
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'received frame for unknown request; this is either a bug in '
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'the clientreactor not screening for this or this instance was '
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'never told about this request: %r' % frame)
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response = self._responses[frame.requestid]
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if action == 'responsedata':
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# Any failures processing this frame should bubble up to the
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# future tracking the request.
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try:
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self._processresponsedata(frame, meta, response)
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except BaseException as e:
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# If an exception occurs before the future is resolved,
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# fail the future. Otherwise, we stuff the exception on
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# the response object so it can be raised during objects()
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# iteration. If nothing is consuming objects(), we could
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# silently swallow this exception. That's a risk we'll have to
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# take.
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if frame.requestid in self._futures:
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self._futures[frame.requestid].set_exception(e)
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del self._futures[frame.requestid]
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response._oninputcomplete()
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else:
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response._onerror(e)
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else:
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raise error.ProgrammingError(
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'unhandled action from clientreactor: %s' % action)
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def _processresponsedata(self, frame, meta, response):
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# This can raise. The caller can handle it.
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response._onresponsedata(meta['data'])
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# We need to be careful about resolving futures prematurely. If a
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# response is a redirect response, resolving the future before the
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# redirect is processed would result in the consumer seeing an
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# empty stream of objects, since they'd be consuming our
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# response.objects() instead of the redirect's response.objects().
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#
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# Our strategy is to not resolve/finish the request until either
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# EOS occurs or until the initial response object is fully received.
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# Always react to eos.
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if meta['eos']:
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response._oninputcomplete()
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del self._requests[frame.requestid]
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# Not EOS but we haven't decoded the initial response object yet.
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# Return and wait for more data.
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elif not response._seeninitial:
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return
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# The specification says no objects should follow the initial/redirect
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# object. So it should be safe to handle the redirect object if one is
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# decoded, without having to wait for EOS.
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if response._redirect:
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self._followredirect(frame.requestid, response._redirect)
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return
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# If the command has a decoder, we wait until all input has been
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# received before resolving the future. Otherwise we resolve the
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# future immediately.
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if frame.requestid not in self._futures:
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return
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if response.command not in COMMAND_DECODERS:
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self._futures[frame.requestid].set_result(response.objects())
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del self._futures[frame.requestid]
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elif response._inputcomplete:
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decoded = COMMAND_DECODERS[response.command](response.objects())
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self._futures[frame.requestid].set_result(decoded)
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del self._futures[frame.requestid]
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def _followredirect(self, requestid, redirect):
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"""Called to initiate redirect following for a request."""
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self._ui.note(_('(following redirect to %s)\n') % redirect.url)
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# TODO handle framed responses.
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if redirect.mediatype != b'application/mercurial-cbor':
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raise error.Abort(_('cannot handle redirects for the %s media type')
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% redirect.mediatype)
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if redirect.fullhashes:
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self._ui.warn(_('(support for validating hashes on content '
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'redirects not supported)\n'))
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if redirect.serverdercerts or redirect.servercadercerts:
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self._ui.warn(_('(support for pinning server certificates on '
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'content redirects not supported)\n'))
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headers = {
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r'Accept': redirect.mediatype,
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}
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req = self._requestbuilder(pycompat.strurl(redirect.url), None, headers)
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try:
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res = self._opener.open(req)
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except util.urlerr.httperror as e:
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if e.code == 401:
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raise error.Abort(_('authorization failed'))
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raise
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except util.httplib.HTTPException as e:
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self._ui.debug('http error requesting %s\n' % req.get_full_url())
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self._ui.traceback()
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raise IOError(None, e)
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urlmod.wrapresponse(res)
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# The existing response object is associated with frame data. Rather
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# than try to normalize its state, just create a new object.
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oldresponse = self._responses[requestid]
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self._responses[requestid] = commandresponse(requestid,
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oldresponse.command,
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fromredirect=True)
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self._redirects.append((requestid, res))
|
|
|
|
|
|
def _processredirect(self, rid, res):
|
|
|
"""Called to continue processing a response from a redirect.
|
|
|
|
|
|
Returns a bool indicating if the redirect is still serviceable.
|
|
|
"""
|
|
|
response = self._responses[rid]
|
|
|
|
|
|
try:
|
|
|
data = res.read(32768)
|
|
|
response._onresponsedata(data)
|
|
|
|
|
|
# We're at end of stream.
|
|
|
if not data:
|
|
|
response._oninputcomplete()
|
|
|
|
|
|
if rid not in self._futures:
|
|
|
return bool(data)
|
|
|
|
|
|
if response.command not in COMMAND_DECODERS:
|
|
|
self._futures[rid].set_result(response.objects())
|
|
|
del self._futures[rid]
|
|
|
elif response._inputcomplete:
|
|
|
decoded = COMMAND_DECODERS[response.command](response.objects())
|
|
|
self._futures[rid].set_result(decoded)
|
|
|
del self._futures[rid]
|
|
|
|
|
|
return bool(data)
|
|
|
|
|
|
except BaseException as e:
|
|
|
self._futures[rid].set_exception(e)
|
|
|
del self._futures[rid]
|
|
|
response._oninputcomplete()
|
|
|
return False
|
|
|
|
|
|
def decodebranchmap(objs):
|
|
|
# Response should be a single CBOR map of branch name to array of nodes.
|
|
|
bm = next(objs)
|
|
|
|
|
|
return {encoding.tolocal(k): v for k, v in bm.items()}
|
|
|
|
|
|
def decodeheads(objs):
|
|
|
# Array of node bytestrings.
|
|
|
return next(objs)
|
|
|
|
|
|
def decodeknown(objs):
|
|
|
# Bytestring where each byte is a 0 or 1.
|
|
|
raw = next(objs)
|
|
|
|
|
|
return [True if raw[i:i + 1] == b'1' else False for i in range(len(raw))]
|
|
|
|
|
|
def decodelistkeys(objs):
|
|
|
# Map with bytestring keys and values.
|
|
|
return next(objs)
|
|
|
|
|
|
def decodelookup(objs):
|
|
|
return next(objs)
|
|
|
|
|
|
def decodepushkey(objs):
|
|
|
return next(objs)
|
|
|
|
|
|
COMMAND_DECODERS = {
|
|
|
'branchmap': decodebranchmap,
|
|
|
'heads': decodeheads,
|
|
|
'known': decodeknown,
|
|
|
'listkeys': decodelistkeys,
|
|
|
'lookup': decodelookup,
|
|
|
'pushkey': decodepushkey,
|
|
|
}
|
|
|
|
