Mercurial > hg
view mercurial/wireproto.py @ 28501:66513f6ca038
commands: centralize code to update with extra care for non-file components
This patch centralizes similar code paths to update the working
directory with extra care for non-file components (e.g. bookmark) into
newly added function updatetotally().
'if True' at the beginning of updatetotally() is redundant at this
patch, but useful to reduce amount of changes in subsequent patch.
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
---|---|
date | Sat, 12 Mar 2016 04:35:42 +0900 |
parents | 48fd02dac1d4 |
children | fd2acc5046f6 |
line wrap: on
line source
# 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 itertools 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()) class remoteiterbatcher(peer.iterbatcher): def __init__(self, remote): super(remoteiterbatcher, self).__init__() self._remote = remote def __getattr__(self, name): if not getattr(self._remote, name, False): raise AttributeError( 'Attempted to iterbatch non-batchable call to %r' % name) return super(remoteiterbatcher, self).__getattr__(name) def submit(self): """Break the batch request into many patch calls and pipeline them. This is mostly valuable over http where request sizes can be limited, but can be used in other places as well. """ req, rsp = [], [] for name, args, opts, resref in self.calls: mtd = getattr(self._remote, name) batchable = mtd.batchable(mtd.im_self, *args, **opts) encargsorres, encresref = batchable.next() assert encresref req.append((name, encargsorres)) rsp.append((batchable, encresref)) if req: self._resultiter = self._remote._submitbatch(req) self._rsp = rsp def results(self): for (batchable, encresref), encres in itertools.izip( self._rsp, self._resultiter): encresref.set(encres) yield 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): """run batch request <req> on the server Returns an iterator of the raw responses from the server. """ 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._callstream("batch", cmds=';'.join(cmds)) # TODO this response parsing is probably suboptimal for large # batches with large responses. work = rsp.read(1024) chunk = work while chunk: while ';' in work: one, work = work.split(';', 1) yield unescapearg(one) chunk = rsp.read(1024) work += chunk yield unescapearg(work) def _submitone(self, op, args): return self._call(op, **args) def iterbatch(self): return remoteiterbatcher(self) @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. 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() # 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())