# wireproto.py - generic wire protocol support functions
#
# Copyright 2005-2010 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.
from __future__ import absolute_import
import os
import sys
import tempfile
import urllib
from .i18n import _
from .node import (
bin,
hex,
)
from . import (
bundle2,
changegroup as changegroupmod,
encoding,
error,
exchange,
peer,
pushkey as pushkeymod,
streamclone,
util,
)
bundle2required = _(
'incompatible Mercurial client; bundle2 required\n'
'(see https://www.mercurial-scm.org/wiki/IncompatibleClient)\n')
class abstractserverproto(object):
"""abstract class that summarizes the protocol API
Used as reference and documentation.
"""
def getargs(self, args):
"""return the value for arguments in <args>
returns a list of values (same order as <args>)"""
raise NotImplementedError()
def getfile(self, fp):
"""write the whole content of a file into a file like object
The file is in the form::
(<chunk-size>\n<chunk>)+0\n
chunk size is the ascii version of the int.
"""
raise NotImplementedError()
def redirect(self):
"""may setup interception for stdout and stderr
See also the `restore` method."""
raise NotImplementedError()
# If the `redirect` function does install interception, the `restore`
# function MUST be defined. If interception is not used, this function
# MUST NOT be defined.
#
# left commented here on purpose
#
#def restore(self):
# """reinstall previous stdout and stderr and return intercepted stdout
# """
# raise NotImplementedError()
def groupchunks(self, cg):
"""return 4096 chunks from a changegroup object
Some protocols may have compressed the contents."""
raise NotImplementedError()
class remotebatch(peer.batcher):
'''batches the queued calls; uses as few roundtrips as possible'''
def __init__(self, remote):
'''remote must support _submitbatch(encbatch) and
_submitone(op, encargs)'''
peer.batcher.__init__(self)
self.remote = remote
def submit(self):
req, rsp = [], []
for name, args, opts, resref in self.calls:
mtd = getattr(self.remote, name)
batchablefn = getattr(mtd, 'batchable', None)
if batchablefn is not None:
batchable = batchablefn(mtd.im_self, *args, **opts)
encargsorres, encresref = batchable.next()
if encresref:
req.append((name, encargsorres,))
rsp.append((batchable, encresref, resref,))
else:
resref.set(encargsorres)
else:
if req:
self._submitreq(req, rsp)
req, rsp = [], []
resref.set(mtd(*args, **opts))
if req:
self._submitreq(req, rsp)
def _submitreq(self, req, rsp):
encresults = self.remote._submitbatch(req)
for encres, r in zip(encresults, rsp):
batchable, encresref, resref = r
encresref.set(encres)
resref.set(batchable.next())
# Forward a couple of names from peer to make wireproto interactions
# slightly more sensible.
batchable = peer.batchable
future = peer.future
# list of nodes encoding / decoding
def decodelist(l, sep=' '):
if l:
return map(bin, l.split(sep))
return []
def encodelist(l, sep=' '):
try:
return sep.join(map(hex, l))
except TypeError:
raise
# batched call argument encoding
def escapearg(plain):
return (plain
.replace(':', ':c')
.replace(',', ':o')
.replace(';', ':s')
.replace('=', ':e'))
def unescapearg(escaped):
return (escaped
.replace(':e', '=')
.replace(':s', ';')
.replace(':o', ',')
.replace(':c', ':'))
# mapping of options accepted by getbundle and their types
#
# Meant to be extended by extensions. It is extensions responsibility to ensure
# such options are properly processed in exchange.getbundle.
#
# supported types are:
#
# :nodes: list of binary nodes
# :csv: list of comma-separated values
# :scsv: list of comma-separated values return as set
# :plain: string with no transformation needed.
gboptsmap = {'heads': 'nodes',
'common': 'nodes',
'obsmarkers': 'boolean',
'bundlecaps': 'scsv',
'listkeys': 'csv',
'cg': 'boolean',
'cbattempted': 'boolean'}
# client side
class wirepeer(peer.peerrepository):
"""Client-side interface for communicating with a peer repository.
Methods commonly call wire protocol commands of the same name.
See also httppeer.py and sshpeer.py for protocol-specific
implementations of this interface.
"""
def batch(self):
if self.capable('batch'):
return remotebatch(self)
else:
return peer.localbatch(self)
def _submitbatch(self, req):
cmds = []
for op, argsdict in req:
args = ','.join('%s=%s' % (escapearg(k), escapearg(v))
for k, v in argsdict.iteritems())
cmds.append('%s %s' % (op, args))
rsp = self._call("batch", cmds=';'.join(cmds))
return [unescapearg(r) for r in rsp.split(';')]
def _submitone(self, op, args):
return self._call(op, **args)
@batchable
def lookup(self, key):
self.requirecap('lookup', _('look up remote revision'))
f = future()
yield {'key': encoding.fromlocal(key)}, f
d = f.value
success, data = d[:-1].split(" ", 1)
if int(success):
yield bin(data)
self._abort(error.RepoError(data))
@batchable
def heads(self):
f = future()
yield {}, f
d = f.value
try:
yield decodelist(d[:-1])
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"), d))
@batchable
def known(self, nodes):
f = future()
yield {'nodes': encodelist(nodes)}, f
d = f.value
try:
yield [bool(int(b)) for b in d]
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"), d))
@batchable
def branchmap(self):
f = future()
yield {}, f
d = f.value
try:
branchmap = {}
for branchpart in d.splitlines():
branchname, branchheads = branchpart.split(' ', 1)
branchname = encoding.tolocal(urllib.unquote(branchname))
branchheads = decodelist(branchheads)
branchmap[branchname] = branchheads
yield branchmap
except TypeError:
self._abort(error.ResponseError(_("unexpected response:"), d))
def branches(self, nodes):
n = encodelist(nodes)
d = self._call("branches", nodes=n)
try:
br = [tuple(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([encodelist(p, '-') for p in pairs[i:i + batch]])
d = self._call("between", pairs=n)
try:
r.extend(l and decodelist(l) or [] for l in d.splitlines())
except ValueError:
self._abort(error.ResponseError(_("unexpected response:"), d))
return r
@batchable
def pushkey(self, namespace, key, old, new):
if not self.capable('pushkey'):
yield False, None
f = future()
self.ui.debug('preparing pushkey for "%s:%s"\n' % (namespace, key))
yield {'namespace': encoding.fromlocal(namespace),
'key': encoding.fromlocal(key),
'old': encoding.fromlocal(old),
'new': encoding.fromlocal(new)}, f
d = f.value
d, output = d.split('\n', 1)
try:
d = bool(int(d))
except ValueError:
raise error.ResponseError(
_('push failed (unexpected response):'), d)
for l in output.splitlines(True):
self.ui.status(_('remote: '), l)
yield d
@batchable
def listkeys(self, namespace):
if not self.capable('pushkey'):
yield {}, None
f = future()
self.ui.debug('preparing listkeys for "%s"\n' % namespace)
yield {'namespace': encoding.fromlocal(namespace)}, f
d = f.value
self.ui.debug('received listkey for "%s": %i bytes\n'
% (namespace, len(d)))
yield pushkeymod.decodekeys(d)
def stream_out(self):
return self._callstream('stream_out')
def changegroup(self, nodes, kind):
n = encodelist(nodes)
f = self._callcompressable("changegroup", roots=n)
return changegroupmod.cg1unpacker(f, 'UN')
def changegroupsubset(self, bases, heads, kind):
self.requirecap('changegroupsubset', _('look up remote changes'))
bases = encodelist(bases)
heads = encodelist(heads)
f = self._callcompressable("changegroupsubset",
bases=bases, heads=heads)
return changegroupmod.cg1unpacker(f, 'UN')
def getbundle(self, source, **kwargs):
self.requirecap('getbundle', _('look up remote changes'))
opts = {}
bundlecaps = kwargs.get('bundlecaps')
if bundlecaps is not None:
kwargs['bundlecaps'] = sorted(bundlecaps)
else:
bundlecaps = () # kwargs could have it to None
for key, value in kwargs.iteritems():
if value is None:
continue
keytype = gboptsmap.get(key)
if keytype is None:
assert False, 'unexpected'
elif keytype == 'nodes':
value = encodelist(value)
elif keytype in ('csv', 'scsv'):
value = ','.join(value)
elif keytype == 'boolean':
value = '%i' % bool(value)
elif keytype != 'plain':
raise KeyError('unknown getbundle option type %s'
% keytype)
opts[key] = value
f = self._callcompressable("getbundle", **opts)
if any((cap.startswith('HG2') for cap in bundlecaps)):
return bundle2.getunbundler(self.ui, f)
else:
return changegroupmod.cg1unpacker(f, 'UN')
def unbundle(self, cg, heads, source):
'''Send cg (a readable file-like object representing the
changegroup to push, typically a chunkbuffer object) to the
remote server as a bundle.
When pushing a bundle10 stream, return an integer indicating the
result of the push (see localrepository.addchangegroup()).
When pushing a bundle20 stream, return a bundle20 stream.'''
if heads != ['force'] and self.capable('unbundlehash'):
heads = encodelist(['hashed',
util.sha1(''.join(sorted(heads))).digest()])
else:
heads = encodelist(heads)
if util.safehasattr(cg, 'deltaheader'):
# this a bundle10, do the old style call sequence
ret, output = self._callpush("unbundle", cg, 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', cg, heads=heads)
ret = bundle2.getunbundler(self.ui, stream)
return ret
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['three'] = three
if four is not None:
opts['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.
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()
# server side
# wire protocol command can either return a string or one of these classes.
class streamres(object):
"""wireproto reply: binary stream
The call was successful and the result is a stream.
Iterate on the `self.gen` attribute to retrieve chunks.
"""
def __init__(self, gen):
self.gen = gen
class pushres(object):
"""wireproto reply: success with simple integer return
The call was successful and returned an integer contained in `self.res`.
"""
def __init__(self, res):
self.res = res
class pusherr(object):
"""wireproto reply: failure
The call failed. The `self.res` attribute contains the error message.
"""
def __init__(self, res):
self.res = res
class ooberror(object):
"""wireproto reply: failure of a batch of operation
Something failed during a batch call. The error message is stored in
`self.message`.
"""
def __init__(self, message):
self.message = message
def dispatch(repo, proto, command):
repo = repo.filtered("served")
func, spec = commands[command]
args = proto.getargs(spec)
return func(repo, proto, *args)
def options(cmd, keys, others):
opts = {}
for k in keys:
if k in others:
opts[k] = others[k]
del others[k]
if others:
sys.stderr.write("warning: %s ignored unexpected arguments %s\n"
% (cmd, ",".join(others)))
return opts
def bundle1allowed(repo, action):
"""Whether a bundle1 operation is allowed from the server.
Priority is:
1. server.bundle1gd.<action> (if generaldelta active)
2. server.bundle1.<action>
3. server.bundle1gd (if generaldelta active)
4. server.bundle1
"""
ui = repo.ui
gd = 'generaldelta' in repo.requirements
if gd:
v = ui.configbool('server', 'bundle1gd.%s' % action, None)
if v is not None:
return v
v = ui.configbool('server', 'bundle1.%s' % action, None)
if v is not None:
return v
if gd:
v = ui.configbool('server', 'bundle1gd', None)
if v is not None:
return v
return ui.configbool('server', 'bundle1', True)
# list of commands
commands = {}
def wireprotocommand(name, args=''):
"""decorator for wire protocol command"""
def register(func):
commands[name] = (func, args)
return func
return register
@wireprotocommand('batch', 'cmds *')
def batch(repo, proto, cmds, others):
repo = repo.filtered("served")
res = []
for pair in cmds.split(';'):
op, args = pair.split(' ', 1)
vals = {}
for a in args.split(','):
if a:
n, v = a.split('=')
vals[n] = unescapearg(v)
func, spec = commands[op]
if spec:
keys = spec.split()
data = {}
for k in keys:
if k == '*':
star = {}
for key in vals.keys():
if key not in keys:
star[key] = vals[key]
data['*'] = star
else:
data[k] = vals[k]
result = func(repo, proto, *[data[k] for k in keys])
else:
result = func(repo, proto)
if isinstance(result, ooberror):
return result
res.append(escapearg(result))
return ';'.join(res)
@wireprotocommand('between', 'pairs')
def between(repo, proto, pairs):
pairs = [decodelist(p, '-') for p in pairs.split(" ")]
r = []
for b in repo.between(pairs):
r.append(encodelist(b) + "\n")
return "".join(r)
@wireprotocommand('branchmap')
def branchmap(repo, proto):
branchmap = repo.branchmap()
heads = []
for branch, nodes in branchmap.iteritems():
branchname = urllib.quote(encoding.fromlocal(branch))
branchnodes = encodelist(nodes)
heads.append('%s %s' % (branchname, branchnodes))
return '\n'.join(heads)
@wireprotocommand('branches', 'nodes')
def branches(repo, proto, nodes):
nodes = decodelist(nodes)
r = []
for b in repo.branches(nodes):
r.append(encodelist(b) + "\n")
return "".join(r)
@wireprotocommand('clonebundles', '')
def clonebundles(repo, proto):
"""Server command for returning info for available bundles to seed clones.
Clients will parse this response and determine what bundle to fetch.
Extensions may wrap this command to filter or dynamically emit data
depending on the request. e.g. you could advertise URLs for the closest
data center given the client's IP address.
"""
return repo.opener.tryread('clonebundles.manifest')
wireprotocaps = ['lookup', 'changegroupsubset', 'branchmap', 'pushkey',
'known', 'getbundle', 'unbundlehash', 'batch']
def _capabilities(repo, proto):
"""return a list of capabilities for a repo
This function exists to allow extensions to easily wrap capabilities
computation
- returns a lists: easy to alter
- change done here will be propagated to both `capabilities` and `hello`
command without any other action needed.
"""
# copy to prevent modification of the global list
caps = list(wireprotocaps)
if streamclone.allowservergeneration(repo.ui):
if repo.ui.configbool('server', 'preferuncompressed', False):
caps.append('stream-preferred')
requiredformats = repo.requirements & repo.supportedformats
# if our local revlogs are just revlogv1, add 'stream' cap
if not requiredformats - set(('revlogv1',)):
caps.append('stream')
# otherwise, add 'streamreqs' detailing our local revlog format
else:
caps.append('streamreqs=%s' % ','.join(sorted(requiredformats)))
if repo.ui.configbool('experimental', 'bundle2-advertise', True):
capsblob = bundle2.encodecaps(bundle2.getrepocaps(repo))
caps.append('bundle2=' + urllib.quote(capsblob))
caps.append('unbundle=%s' % ','.join(changegroupmod.bundlepriority))
caps.append(
'httpheader=%d' % repo.ui.configint('server', 'maxhttpheaderlen', 1024))
return caps
# If you are writing an extension and consider wrapping this function. Wrap
# `_capabilities` instead.
@wireprotocommand('capabilities')
def capabilities(repo, proto):
return ' '.join(_capabilities(repo, proto))
@wireprotocommand('changegroup', 'roots')
def changegroup(repo, proto, roots):
nodes = decodelist(roots)
cg = changegroupmod.changegroup(repo, nodes, 'serve')
return streamres(proto.groupchunks(cg))
@wireprotocommand('changegroupsubset', 'bases heads')
def changegroupsubset(repo, proto, bases, heads):
bases = decodelist(bases)
heads = decodelist(heads)
cg = changegroupmod.changegroupsubset(repo, bases, heads, 'serve')
return streamres(proto.groupchunks(cg))
@wireprotocommand('debugwireargs', 'one two *')
def debugwireargs(repo, proto, one, two, others):
# only accept optional args from the known set
opts = options('debugwireargs', ['three', 'four'], others)
return repo.debugwireargs(one, two, **opts)
# List of options accepted by getbundle.
#
# Meant to be extended by extensions. It is the extension's responsibility to
# ensure such options are properly processed in exchange.getbundle.
gboptslist = ['heads', 'common', 'bundlecaps']
@wireprotocommand('getbundle', '*')
def getbundle(repo, proto, others):
opts = options('getbundle', gboptsmap.keys(), others)
for k, v in opts.iteritems():
keytype = gboptsmap[k]
if keytype == 'nodes':
opts[k] = decodelist(v)
elif keytype == 'csv':
opts[k] = list(v.split(','))
elif keytype == 'scsv':
opts[k] = set(v.split(','))
elif keytype == 'boolean':
# Client should serialize False as '0', which is a non-empty string
# so it evaluates as a True bool.
if v == '0':
opts[k] = False
else:
opts[k] = bool(v)
elif keytype != 'plain':
raise KeyError('unknown getbundle option type %s'
% keytype)
if not bundle1allowed(repo, 'pull'):
if not exchange.bundle2requested(opts.get('bundlecaps')):
return ooberror(bundle2required)
cg = exchange.getbundle(repo, 'serve', **opts)
return streamres(proto.groupchunks(cg))
@wireprotocommand('heads')
def heads(repo, proto):
h = repo.heads()
return encodelist(h) + "\n"
@wireprotocommand('hello')
def hello(repo, proto):
'''the hello command returns a set of lines describing various
interesting things about the server, in an RFC822-like format.
Currently the only one defined is "capabilities", which
consists of a line in the form:
capabilities: space separated list of tokens
'''
return "capabilities: %s\n" % (capabilities(repo, proto))
@wireprotocommand('listkeys', 'namespace')
def listkeys(repo, proto, namespace):
d = repo.listkeys(encoding.tolocal(namespace)).items()
return pushkeymod.encodekeys(d)
@wireprotocommand('lookup', 'key')
def lookup(repo, proto, key):
try:
k = encoding.tolocal(key)
c = repo[k]
r = c.hex()
success = 1
except Exception as inst:
r = str(inst)
success = 0
return "%s %s\n" % (success, r)
@wireprotocommand('known', 'nodes *')
def known(repo, proto, nodes, others):
return ''.join(b and "1" or "0" for b in repo.known(decodelist(nodes)))
@wireprotocommand('pushkey', 'namespace key old new')
def pushkey(repo, proto, namespace, key, old, new):
# compatibility with pre-1.8 clients which were accidentally
# sending raw binary nodes rather than utf-8-encoded hex
if len(new) == 20 and new.encode('string-escape') != new:
# looks like it could be a binary node
try:
new.decode('utf-8')
new = encoding.tolocal(new) # but cleanly decodes as UTF-8
except UnicodeDecodeError:
pass # binary, leave unmodified
else:
new = encoding.tolocal(new) # normal path
if util.safehasattr(proto, 'restore'):
proto.redirect()
try:
r = repo.pushkey(encoding.tolocal(namespace), encoding.tolocal(key),
encoding.tolocal(old), new) or False
except error.Abort:
r = False
output = proto.restore()
return '%s\n%s' % (int(r), output)
r = repo.pushkey(encoding.tolocal(namespace), encoding.tolocal(key),
encoding.tolocal(old), new)
return '%s\n' % int(r)
@wireprotocommand('stream_out')
def stream(repo, proto):
'''If the server supports streaming clone, it advertises the "stream"
capability with a value representing the version and flags of the repo
it is serving. Client checks to see if it understands the format.
'''
if not streamclone.allowservergeneration(repo.ui):
return '1\n'
def getstream(it):
yield '0\n'
for chunk in it:
yield chunk
try:
# LockError may be raised before the first result is yielded. Don't
# emit output until we're sure we got the lock successfully.
it = streamclone.generatev1wireproto(repo)
return streamres(getstream(it))
except error.LockError:
return '2\n'
@wireprotocommand('unbundle', 'heads')
def unbundle(repo, proto, heads):
their_heads = decodelist(heads)
try:
proto.redirect()
exchange.check_heads(repo, their_heads, 'preparing changes')
# write bundle data to temporary file because it can be big
fd, tempname = tempfile.mkstemp(prefix='hg-unbundle-')
fp = os.fdopen(fd, 'wb+')
r = 0
try:
proto.getfile(fp)
fp.seek(0)
gen = exchange.readbundle(repo.ui, fp, None)
if (isinstance(gen, changegroupmod.cg1unpacker)
and not bundle1allowed(repo, 'push')):
return ooberror(bundle2required)
r = exchange.unbundle(repo, gen, their_heads, 'serve',
proto._client())
if util.safehasattr(r, 'addpart'):
# The return looks streamable, we are in the bundle2 case and
# should return a stream.
return streamres(r.getchunks())
return pushres(r)
finally:
fp.close()
os.unlink(tempname)
except (error.BundleValueError, error.Abort, error.PushRaced) as exc:
# handle non-bundle2 case first
if not getattr(exc, 'duringunbundle2', False):
try:
raise
except error.Abort:
# The old code we moved used sys.stderr directly.
# We did not change it to minimise code change.
# This need to be moved to something proper.
# Feel free to do it.
sys.stderr.write("abort: %s\n" % exc)
return pushres(0)
except error.PushRaced:
return pusherr(str(exc))
bundler = bundle2.bundle20(repo.ui)
for out in getattr(exc, '_bundle2salvagedoutput', ()):
bundler.addpart(out)
try:
try:
raise
except error.PushkeyFailed as exc:
# check client caps
remotecaps = getattr(exc, '_replycaps', None)
if (remotecaps is not None
and 'pushkey' not in remotecaps.get('error', ())):
# no support remote side, fallback to Abort handler.
raise
part = bundler.newpart('error:pushkey')
part.addparam('in-reply-to', exc.partid)
if exc.namespace is not None:
part.addparam('namespace', exc.namespace, mandatory=False)
if exc.key is not None:
part.addparam('key', exc.key, mandatory=False)
if exc.new is not None:
part.addparam('new', exc.new, mandatory=False)
if exc.old is not None:
part.addparam('old', exc.old, mandatory=False)
if exc.ret is not None:
part.addparam('ret', exc.ret, mandatory=False)
except error.BundleValueError as exc:
errpart = bundler.newpart('error:unsupportedcontent')
if exc.parttype is not None:
errpart.addparam('parttype', exc.parttype)
if exc.params:
errpart.addparam('params', '\0'.join(exc.params))
except error.Abort as exc:
manargs = [('message', str(exc))]
advargs = []
if exc.hint is not None:
advargs.append(('hint', exc.hint))
bundler.addpart(bundle2.bundlepart('error:abort',
manargs, advargs))
except error.PushRaced as exc:
bundler.newpart('error:pushraced', [('message', str(exc))])
return streamres(bundler.getchunks())