Mercurial > hg
view hgext/largefiles/proto.py @ 35507:95a9be56c3bb
largefiles: modernize how capabilities are added to the wire protocol
See 982f13bef503, which came well after this code was originally written.
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Tue, 26 Dec 2017 23:40:49 -0500 |
parents | 576ba8194fa8 |
children | a39a9df7ecca |
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# Copyright 2011 Fog Creek Software # # 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 re from mercurial.i18n import _ from mercurial import ( error, httppeer, util, wireproto, ) from . import ( lfutil, ) urlerr = util.urlerr urlreq = util.urlreq LARGEFILES_REQUIRED_MSG = ('\nThis repository uses the largefiles extension.' '\n\nPlease enable it in your Mercurial config ' 'file.\n') # these will all be replaced by largefiles.uisetup ssholdcallstream = None httpoldcallstream = None def putlfile(repo, proto, sha): '''Server command for putting a largefile into a repository's local store and into the user cache.''' proto.redirect() path = lfutil.storepath(repo, sha) util.makedirs(os.path.dirname(path)) tmpfp = util.atomictempfile(path, createmode=repo.store.createmode) try: proto.getfile(tmpfp) tmpfp._fp.seek(0) if sha != lfutil.hexsha1(tmpfp._fp): raise IOError(0, _('largefile contents do not match hash')) tmpfp.close() lfutil.linktousercache(repo, sha) except IOError as e: repo.ui.warn(_('largefiles: failed to put %s into store: %s\n') % (sha, e.strerror)) return wireproto.pushres(1) finally: tmpfp.discard() return wireproto.pushres(0) def getlfile(repo, proto, sha): '''Server command for retrieving a largefile from the repository-local cache or user cache.''' filename = lfutil.findfile(repo, sha) if not filename: raise error.Abort(_('requested largefile %s not present in cache') % sha) f = open(filename, 'rb') length = os.fstat(f.fileno())[6] # Since we can't set an HTTP content-length header here, and # Mercurial core provides no way to give the length of a streamres # (and reading the entire file into RAM would be ill-advised), we # just send the length on the first line of the response, like the # ssh proto does for string responses. def generator(): yield '%d\n' % length for chunk in util.filechunkiter(f): yield chunk return wireproto.streamres(gen=generator()) def statlfile(repo, proto, sha): '''Server command for checking if a largefile is present - returns '2\n' if the largefile is missing, '0\n' if it seems to be in good condition. The value 1 is reserved for mismatched checksum, but that is too expensive to be verified on every stat and must be caught be running 'hg verify' server side.''' filename = lfutil.findfile(repo, sha) if not filename: return '2\n' return '0\n' def wirereposetup(ui, repo): class lfileswirerepository(repo.__class__): def putlfile(self, sha, fd): # unfortunately, httprepository._callpush tries to convert its # input file-like into a bundle before sending it, so we can't use # it ... if issubclass(self.__class__, httppeer.httppeer): res = self._call('putlfile', data=fd, sha=sha, headers={'content-type':'application/mercurial-0.1'}) try: d, output = res.split('\n', 1) for l in output.splitlines(True): self.ui.warn(_('remote: '), l) # assume l ends with \n return int(d) except ValueError: self.ui.warn(_('unexpected putlfile response: %r\n') % res) return 1 # ... but we can't use sshrepository._call because the data= # argument won't get sent, and _callpush does exactly what we want # in this case: send the data straight through else: try: ret, output = self._callpush("putlfile", fd, sha=sha) if ret == "": raise error.ResponseError(_('putlfile failed:'), output) return int(ret) except IOError: return 1 except ValueError: raise error.ResponseError( _('putlfile failed (unexpected response):'), ret) def getlfile(self, sha): """returns an iterable with the chunks of the file with sha sha""" stream = self._callstream("getlfile", sha=sha) length = stream.readline() try: length = int(length) except ValueError: self._abort(error.ResponseError(_("unexpected response:"), length)) # SSH streams will block if reading more than length for chunk in util.filechunkiter(stream, limit=length): yield chunk # HTTP streams must hit the end to process the last empty # chunk of Chunked-Encoding so the connection can be reused. if issubclass(self.__class__, httppeer.httppeer): chunk = stream.read(1) if chunk: self._abort(error.ResponseError(_("unexpected response:"), chunk)) @wireproto.batchable def statlfile(self, sha): f = wireproto.future() result = {'sha': sha} yield result, f try: yield int(f.value) except (ValueError, urlerr.httperror): # If the server returns anything but an integer followed by a # newline, newline, it's not speaking our language; if we get # an HTTP error, we can't be sure the largefile is present; # either way, consider it missing. yield 2 repo.__class__ = lfileswirerepository # advertise the largefiles=serve capability def _capabilities(orig, repo, proto): '''announce largefile server capability''' caps = orig(repo, proto) caps.append('largefiles=serve') return caps def heads(repo, proto): '''Wrap server command - largefile capable clients will know to call lheads instead''' if lfutil.islfilesrepo(repo): return wireproto.ooberror(LARGEFILES_REQUIRED_MSG) return wireproto.heads(repo, proto) def sshrepocallstream(self, cmd, **args): if cmd == 'heads' and self.capable('largefiles'): cmd = 'lheads' if cmd == 'batch' and self.capable('largefiles'): args[r'cmds'] = args[r'cmds'].replace('heads ', 'lheads ') return ssholdcallstream(self, cmd, **args) headsre = re.compile(r'(^|;)heads\b') def httprepocallstream(self, cmd, **args): if cmd == 'heads' and self.capable('largefiles'): cmd = 'lheads' if cmd == 'batch' and self.capable('largefiles'): args[r'cmds'] = headsre.sub('lheads', args[r'cmds']) return httpoldcallstream(self, cmd, **args)