Mercurial > hg
view mercurial/wireproto.py @ 25023:405cb38448ad
revset: remove duplicated definition of choice() from addset._iterordered()
choice() is already defined before val1 = None. Perhaps there was merge or
rebase error.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Mon, 27 Apr 2015 23:03:20 +0900 |
parents | 0c4d5e01b31f |
children | 631766d1f57a |
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. import urllib, tempfile, os, sys from i18n import _ from node import bin, hex import changegroup as changegroupmod, bundle2, pushkey as pushkeymod import peer, error, encoding, util, store, exchange 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() # abstract batching support class future(object): '''placeholder for a value to be set later''' def set(self, value): if util.safehasattr(self, 'value'): raise error.RepoError("future is already set") self.value = value class batcher(object): '''base class for batches of commands submittable in a single request All methods invoked on instances of this class are simply queued and return a a future for the result. Once you call submit(), all the queued calls are performed and the results set in their respective futures. ''' def __init__(self): self.calls = [] def __getattr__(self, name): def call(*args, **opts): resref = future() self.calls.append((name, args, opts, resref,)) return resref return call def submit(self): pass class localbatch(batcher): '''performs the queued calls directly''' def __init__(self, local): batcher.__init__(self) self.local = local def submit(self): for name, args, opts, resref in self.calls: resref.set(getattr(self.local, name)(*args, **opts)) class remotebatch(batcher): '''batches the queued calls; uses as few roundtrips as possible''' def __init__(self, remote): '''remote must support _submitbatch(encbatch) and _submitone(op, encargs)''' 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()) def batchable(f): '''annotation for batchable methods Such methods must implement a coroutine as follows: @batchable def sample(self, one, two=None): # Handle locally computable results first: if not one: yield "a local result", None # Build list of encoded arguments suitable for your wire protocol: encargs = [('one', encode(one),), ('two', encode(two),)] # Create future for injection of encoded result: encresref = future() # Return encoded arguments and future: yield encargs, encresref # Assuming the future to be filled with the result from the batched # request now. Decode it: yield decode(encresref.value) The decorator returns a function which wraps this coroutine as a plain method, but adds the original method as an attribute called "batchable", which is used by remotebatch to split the call into separate encoding and decoding phases. ''' def plain(*args, **opts): batchable = f(*args, **opts) encargsorres, encresref = batchable.next() if not encresref: return encargsorres # a local result in this case self = args[0] encresref.set(self._submitone(f.func_name, encargsorres)) return batchable.next() setattr(plain, 'batchable', f) return plain # 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: print l raise # batched call argument encoding def escapearg(plain): return (plain .replace(':', '::') .replace(',', ':,') .replace(';', ':;') .replace('=', ':=')) def unescapearg(escaped): return (escaped .replace(':=', '=') .replace(':;', ';') .replace(':,', ',') .replace('::', ':')) # 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 # :plain: string with no transformation needed. gboptsmap = {'heads': 'nodes', 'common': 'nodes', 'obsmarkers': 'boolean', 'bundlecaps': 'csv', 'listkeys': 'csv', 'cg': 'boolean'} # client side class wirepeer(peer.peerrepository): def batch(self): return remotebatch(self) def _submitbatch(self, req): cmds = [] for op, argsdict in req: args = ','.join('%s=%s' % p for p in argsdict.iteritems()) cmds.append('%s %s' % (op, args)) rsp = self._call("batch", cmds=';'.join(cmds)) return 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 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 = {} 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 == 'csv': 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) bundlecaps = kwargs.get('bundlecaps') if bundlecaps is None: bundlecaps = () # kwargs could have it to None if util.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 # 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) 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 _allowstream(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(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=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] = set(v.split(',')) elif keytype == 'boolean': opts[k] = bool(v) elif keytype != 'plain': raise KeyError('unknown getbundle option type %s' % keytype) 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, 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 util.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) def _allowstream(ui): return ui.configbool('server', 'uncompressed', True, untrusted=True) def _walkstreamfiles(repo): # this is it's own function so extensions can override it return repo.store.walk() @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. The format is simple: the server writes out a line with the amount of files, then the total amount of bytes to be transferred (separated by a space). Then, for each file, the server first writes the filename and file size (separated by the null character), then the file contents. ''' if not _allowstream(repo.ui): return '1\n' entries = [] total_bytes = 0 try: # get consistent snapshot of repo, lock during scan lock = repo.lock() try: repo.ui.debug('scanning\n') for name, ename, size in _walkstreamfiles(repo): if size: entries.append((name, size)) total_bytes += size finally: lock.release() except error.LockError: return '2\n' # error: 2 def streamer(repo, entries, total): '''stream out all metadata files in repository.''' yield '0\n' # success repo.ui.debug('%d files, %d bytes to transfer\n' % (len(entries), total_bytes)) yield '%d %d\n' % (len(entries), total_bytes) sopener = repo.svfs oldaudit = sopener.mustaudit debugflag = repo.ui.debugflag sopener.mustaudit = False try: for name, size in entries: if debugflag: repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) # partially encode name over the wire for backwards compat yield '%s\0%d\n' % (store.encodedir(name), size) if size <= 65536: fp = sopener(name) try: data = fp.read(size) finally: fp.close() yield data else: for chunk in util.filechunkiter(sopener(name), limit=size): yield chunk # replace with "finally:" when support for python 2.4 has been dropped except Exception: sopener.mustaudit = oldaudit raise sopener.mustaudit = oldaudit return streamres(streamer(repo, entries, total_bytes)) @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) 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, util.Abort, error.PushRaced), exc: # handle non-bundle2 case first if not getattr(exc, 'duringunbundle2', False): try: raise except util.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: raise except error.BundleValueError, 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 util.Abort, 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, exc: bundler.newpart('error:pushraced', [('message', str(exc))]) return streamres(bundler.getchunks())