Mercurial > hg
view mercurial/wireproto.py @ 21022:52e9e63f1495
run-tests: test result shows when a failed test could not start a server
Failing to start a server happens regularly, at least on windows buildbot.
Such a failure often has nothing to do with the test, but with the environment.
But half the test output can change because some data is missing. Therefore this
is worth an extended error message.
Detect the server failure in the diff output because it is most reliable
there. Checking the output only does not show if the server failure was
expected.
Old failure message when server start failed:
Failed test-serve.t: output changed
New message:
Failed test-serve.t: serve failed and output changed
author | Simon Heimberg <simohe@besonet.ch> |
---|---|
date | Mon, 25 Nov 2013 22:00:46 +0100 |
parents | 7a679918ee2b |
children | 7731a2281cf0 |
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 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=' '): return sep.join(map(hex, l)) # batched call argument encoding def escapearg(plain): return (plain .replace(':', '::') .replace(',', ':,') .replace(';', ':;') .replace('=', ':=')) def unescapearg(escaped): return (escaped .replace(':=', '=') .replace(':;', ';') .replace(':,', ',') .replace('::', ':')) # 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(f)) for f 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 r = {} for l in d.splitlines(): k, v = l.split('\t') r[encoding.tolocal(k)] = encoding.tolocal(v) yield r 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.unbundle10(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.unbundle10(f, 'UN') def getbundle(self, source, heads=None, common=None, bundlecaps=None): self.requirecap('getbundle', _('look up remote changes')) opts = {} if heads is not None: opts['heads'] = encodelist(heads) if common is not None: opts['common'] = encodelist(common) if bundlecaps is not None: opts['bundlecaps'] = ','.join(bundlecaps) f = self._callcompressable("getbundle", **opts) return changegroupmod.unbundle10(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. Return an integer indicating the result of the push (see localrepository.addchangegroup()).''' if heads != ['force'] and self.capable('unbundlehash'): heads = encodelist(['hashed', util.sha1(''.join(sorted(heads))).digest()]) else: heads = encodelist(heads) 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) 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 implementaitons. 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 _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("abort: %s got unexpected arguments %s\n" % (cmd, ",".join(others))) return opts # list of commands commands = {} def wireprotocommand(name, args=''): """decorator for wireprotocol 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 effort. 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)) caps.append('unbundle=%s' % ','.join(changegroupmod.bundlepriority)) caps.append('httpheader=1024') return caps # If you are writting and 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) @wireprotocommand('getbundle', '*') def getbundle(repo, proto, others): opts = options('getbundle', ['heads', 'common', 'bundlecaps'], others) for k, v in opts.iteritems(): if k in ('heads', 'common'): opts[k] = decodelist(v) elif k == 'bundlecaps': opts[k] = set(v.split(',')) cg = changegroupmod.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() t = '\n'.join(['%s\t%s' % (encoding.fromlocal(k), encoding.fromlocal(v)) for k, v in d]) return t @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 filesize (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.sopener 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 = changegroupmod.readbundle(fp, None) r = exchange.unbundle(repo, gen, their_heads, 'serve', proto._client()) return pushres(r) finally: fp.close() os.unlink(tempname) except util.Abort, inst: # The old code we moved used sys.stderr directly. # We did not changed it to minise code change. # This need to be moved to something proper. # Feel free to do it. sys.stderr.write("abort: %s\n" % inst) return pushres(0) except exchange.PushRaced, exc: return pusherr(str(exc))