Mercurial > hg
view mercurial/hgweb/hgweb_mod.py @ 26755:bb0b955d050d
streamclone: support for producing and consuming stream clone bundles
Up to this point, stream clones only existed as a dynamically generated
data format produced and consumed during streaming clones. In order to
support this efficient cloning format with the clone bundles feature, we
need a more formal, on disk representation of the streaming clone data.
This patch introduces a new "bundle" type for streaming clones. Unlike
existing bundles, it does not contain changegroup data. It does,
however, share the same concepts like the 4 byte header which identifies
the type of data that follows and the 2 byte abbreviation for
compression types (of which only "UN" is currently supported).
The new bundle format is essentially the existing stream clone version 1
data format with some headers at the beginning.
Content negotiation at stream clone request time checked for repository
format/requirements compatibility before initiating a stream clone. We
can't do active content negotiation when using clone bundles. So, we put
this set of requirements inside the payload so consumers have a built-in
mechanism for checking compatibility before reading and applying lots of
data. Of course, we will also advertise this requirements set in clone
bundles. But that's for another patch.
We currently don't have a mechanism to produce and consume this new
bundle format. This will be implemented in upcoming patches.
It's worth noting that if a legacy client attempts to `hg unbundle` a
stream clone bundle (with the "HGS1" header), it will abort with:
"unknown bundle version S1," which seems appropriate.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sat, 17 Oct 2015 11:14:52 -0700 |
parents | 4b0fc75f9403 |
children | 7c1b4840c2cd |
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# hgweb/hgweb_mod.py - Web interface for a repository. # # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> # Copyright 2005-2007 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 contextlib import os from mercurial import ui, hg, hook, error, encoding, templater, util, repoview from mercurial.templatefilters import websub from common import ErrorResponse, permhooks, caching from common import HTTP_OK, HTTP_NOT_MODIFIED, HTTP_BAD_REQUEST from common import HTTP_NOT_FOUND, HTTP_SERVER_ERROR from request import wsgirequest import webcommands, protocol, webutil perms = { 'changegroup': 'pull', 'changegroupsubset': 'pull', 'getbundle': 'pull', 'stream_out': 'pull', 'listkeys': 'pull', 'unbundle': 'push', 'pushkey': 'push', } def makebreadcrumb(url, prefix=''): '''Return a 'URL breadcrumb' list A 'URL breadcrumb' is a list of URL-name pairs, corresponding to each of the path items on a URL. This can be used to create path navigation entries. ''' if url.endswith('/'): url = url[:-1] if prefix: url = '/' + prefix + url relpath = url if relpath.startswith('/'): relpath = relpath[1:] breadcrumb = [] urlel = url pathitems = [''] + relpath.split('/') for pathel in reversed(pathitems): if not pathel or not urlel: break breadcrumb.append({'url': urlel, 'name': pathel}) urlel = os.path.dirname(urlel) return reversed(breadcrumb) class requestcontext(object): """Holds state/context for an individual request. Servers can be multi-threaded. Holding state on the WSGI application is prone to race conditions. Instances of this class exist to hold mutable and race-free state for requests. """ def __init__(self, app, repo): self.repo = repo self.reponame = app.reponame self.archives = ('zip', 'gz', 'bz2') self.maxchanges = self.configint('web', 'maxchanges', 10) self.stripecount = self.configint('web', 'stripes', 1) self.maxshortchanges = self.configint('web', 'maxshortchanges', 60) self.maxfiles = self.configint('web', 'maxfiles', 10) self.allowpull = self.configbool('web', 'allowpull', True) # we use untrusted=False to prevent a repo owner from using # web.templates in .hg/hgrc to get access to any file readable # by the user running the CGI script self.templatepath = self.config('web', 'templates', untrusted=False) # This object is more expensive to build than simple config values. # It is shared across requests. The app will replace the object # if it is updated. Since this is a reference and nothing should # modify the underlying object, it should be constant for the lifetime # of the request. self.websubtable = app.websubtable # Trust the settings from the .hg/hgrc files by default. def config(self, section, name, default=None, untrusted=True): return self.repo.ui.config(section, name, default, untrusted=untrusted) def configbool(self, section, name, default=False, untrusted=True): return self.repo.ui.configbool(section, name, default, untrusted=untrusted) def configint(self, section, name, default=None, untrusted=True): return self.repo.ui.configint(section, name, default, untrusted=untrusted) def configlist(self, section, name, default=None, untrusted=True): return self.repo.ui.configlist(section, name, default, untrusted=untrusted) archivespecs = { 'bz2': ('application/x-bzip2', 'tbz2', '.tar.bz2', None), 'gz': ('application/x-gzip', 'tgz', '.tar.gz', None), 'zip': ('application/zip', 'zip', '.zip', None), } def archivelist(self, nodeid): allowed = self.configlist('web', 'allow_archive') for typ, spec in self.archivespecs.iteritems(): if typ in allowed or self.configbool('web', 'allow%s' % typ): yield {'type': typ, 'extension': spec[2], 'node': nodeid} def templater(self, req): # determine scheme, port and server name # this is needed to create absolute urls proto = req.env.get('wsgi.url_scheme') if proto == 'https': proto = 'https' default_port = '443' else: proto = 'http' default_port = '80' port = req.env['SERVER_PORT'] port = port != default_port and (':' + port) or '' urlbase = '%s://%s%s' % (proto, req.env['SERVER_NAME'], port) logourl = self.config('web', 'logourl', 'https://mercurial-scm.org/') logoimg = self.config('web', 'logoimg', 'hglogo.png') staticurl = self.config('web', 'staticurl') or req.url + 'static/' if not staticurl.endswith('/'): staticurl += '/' # some functions for the templater def motd(**map): yield self.config('web', 'motd', '') # figure out which style to use vars = {} styles = ( req.form.get('style', [None])[0], self.config('web', 'style'), 'paper', ) style, mapfile = templater.stylemap(styles, self.templatepath) if style == styles[0]: vars['style'] = style start = req.url[-1] == '?' and '&' or '?' sessionvars = webutil.sessionvars(vars, start) if not self.reponame: self.reponame = (self.config('web', 'name') or req.env.get('REPO_NAME') or req.url.strip('/') or self.repo.root) def websubfilter(text): return websub(text, self.websubtable) # create the templater tmpl = templater.templater(mapfile, filters={'websub': websubfilter}, defaults={'url': req.url, 'logourl': logourl, 'logoimg': logoimg, 'staticurl': staticurl, 'urlbase': urlbase, 'repo': self.reponame, 'encoding': encoding.encoding, 'motd': motd, 'sessionvars': sessionvars, 'pathdef': makebreadcrumb(req.url), 'style': style, }) return tmpl class hgweb(object): """HTTP server for individual repositories. Instances of this class serve HTTP responses for a particular repository. Instances are typically used as WSGI applications. Some servers are multi-threaded. On these servers, there may be multiple active threads inside __call__. """ def __init__(self, repo, name=None, baseui=None): if isinstance(repo, str): if baseui: u = baseui.copy() else: u = ui.ui() r = hg.repository(u, repo) else: # we trust caller to give us a private copy r = repo r.ui.setconfig('ui', 'report_untrusted', 'off', 'hgweb') r.baseui.setconfig('ui', 'report_untrusted', 'off', 'hgweb') r.ui.setconfig('ui', 'nontty', 'true', 'hgweb') r.baseui.setconfig('ui', 'nontty', 'true', 'hgweb') # resolve file patterns relative to repo root r.ui.setconfig('ui', 'forcecwd', r.root, 'hgweb') r.baseui.setconfig('ui', 'forcecwd', r.root, 'hgweb') # displaying bundling progress bar while serving feel wrong and may # break some wsgi implementation. r.ui.setconfig('progress', 'disable', 'true', 'hgweb') r.baseui.setconfig('progress', 'disable', 'true', 'hgweb') self._repos = [hg.cachedlocalrepo(self._webifyrepo(r))] self._lastrepo = self._repos[0] hook.redirect(True) self.reponame = name def _webifyrepo(self, repo): repo = getwebview(repo) self.websubtable = webutil.getwebsubs(repo) return repo @contextlib.contextmanager def _obtainrepo(self): """Obtain a repo unique to the caller. Internally we maintain a stack of cachedlocalrepo instances to be handed out. If one is available, we pop it and return it, ensuring it is up to date in the process. If one is not available, we clone the most recently used repo instance and return it. It is currently possible for the stack to grow without bounds if the server allows infinite threads. However, servers should have a thread limit, thus establishing our limit. """ if self._repos: cached = self._repos.pop() r, created = cached.fetch() else: cached = self._lastrepo.copy() r, created = cached.fetch() if created: r = self._webifyrepo(r) self._lastrepo = cached self.mtime = cached.mtime try: yield r finally: self._repos.append(cached) def run(self): """Start a server from CGI environment. Modern servers should be using WSGI and should avoid this method, if possible. """ if not os.environ.get('GATEWAY_INTERFACE', '').startswith("CGI/1."): raise RuntimeError("This function is only intended to be " "called while running as a CGI script.") import mercurial.hgweb.wsgicgi as wsgicgi wsgicgi.launch(self) def __call__(self, env, respond): """Run the WSGI application. This may be called by multiple threads. """ req = wsgirequest(env, respond) return self.run_wsgi(req) def run_wsgi(self, req): """Internal method to run the WSGI application. This is typically only called by Mercurial. External consumers should be using instances of this class as the WSGI application. """ with self._obtainrepo() as repo: for r in self._runwsgi(req, repo): yield r def _runwsgi(self, req, repo): rctx = requestcontext(self, repo) # This state is global across all threads. encoding.encoding = rctx.config('web', 'encoding', encoding.encoding) rctx.repo.ui.environ = req.env # work with CGI variables to create coherent structure # use SCRIPT_NAME, PATH_INFO and QUERY_STRING as well as our REPO_NAME req.url = req.env['SCRIPT_NAME'] if not req.url.endswith('/'): req.url += '/' if 'REPO_NAME' in req.env: req.url += req.env['REPO_NAME'] + '/' if 'PATH_INFO' in req.env: parts = req.env['PATH_INFO'].strip('/').split('/') repo_parts = req.env.get('REPO_NAME', '').split('/') if parts[:len(repo_parts)] == repo_parts: parts = parts[len(repo_parts):] query = '/'.join(parts) else: query = req.env['QUERY_STRING'].split('&', 1)[0] query = query.split(';', 1)[0] # process this if it's a protocol request # protocol bits don't need to create any URLs # and the clients always use the old URL structure cmd = req.form.get('cmd', [''])[0] if protocol.iscmd(cmd): try: if query: raise ErrorResponse(HTTP_NOT_FOUND) if cmd in perms: self.check_perm(rctx, req, perms[cmd]) return protocol.call(rctx.repo, req, cmd) except ErrorResponse as inst: # A client that sends unbundle without 100-continue will # break if we respond early. if (cmd == 'unbundle' and (req.env.get('HTTP_EXPECT', '').lower() != '100-continue') or req.env.get('X-HgHttp2', '')): req.drain() else: req.headers.append(('Connection', 'Close')) req.respond(inst, protocol.HGTYPE, body='0\n%s\n' % inst) return '' # translate user-visible url structure to internal structure args = query.split('/', 2) if 'cmd' not in req.form and args and args[0]: cmd = args.pop(0) style = cmd.rfind('-') if style != -1: req.form['style'] = [cmd[:style]] cmd = cmd[style + 1:] # avoid accepting e.g. style parameter as command if util.safehasattr(webcommands, cmd): req.form['cmd'] = [cmd] if cmd == 'static': req.form['file'] = ['/'.join(args)] else: if args and args[0]: node = args.pop(0).replace('%2F', '/') req.form['node'] = [node] if args: req.form['file'] = args ua = req.env.get('HTTP_USER_AGENT', '') if cmd == 'rev' and 'mercurial' in ua: req.form['style'] = ['raw'] if cmd == 'archive': fn = req.form['node'][0] for type_, spec in rctx.archivespecs.iteritems(): ext = spec[2] if fn.endswith(ext): req.form['node'] = [fn[:-len(ext)]] req.form['type'] = [type_] # process the web interface request try: tmpl = rctx.templater(req) ctype = tmpl('mimetype', encoding=encoding.encoding) ctype = templater.stringify(ctype) # check read permissions non-static content if cmd != 'static': self.check_perm(rctx, req, None) if cmd == '': req.form['cmd'] = [tmpl.cache['default']] cmd = req.form['cmd'][0] if rctx.configbool('web', 'cache', True): caching(self, req) # sets ETag header or raises NOT_MODIFIED if cmd not in webcommands.__all__: msg = 'no such method: %s' % cmd raise ErrorResponse(HTTP_BAD_REQUEST, msg) elif cmd == 'file' and 'raw' in req.form.get('style', []): rctx.ctype = ctype content = webcommands.rawfile(rctx, req, tmpl) else: content = getattr(webcommands, cmd)(rctx, req, tmpl) req.respond(HTTP_OK, ctype) return content except (error.LookupError, error.RepoLookupError) as err: req.respond(HTTP_NOT_FOUND, ctype) msg = str(err) if (util.safehasattr(err, 'name') and not isinstance(err, error.ManifestLookupError)): msg = 'revision not found: %s' % err.name return tmpl('error', error=msg) except (error.RepoError, error.RevlogError) as inst: req.respond(HTTP_SERVER_ERROR, ctype) return tmpl('error', error=str(inst)) except ErrorResponse as inst: req.respond(inst, ctype) if inst.code == HTTP_NOT_MODIFIED: # Not allowed to return a body on a 304 return [''] return tmpl('error', error=str(inst)) def check_perm(self, rctx, req, op): for permhook in permhooks: permhook(rctx, req, op) def getwebview(repo): """The 'web.view' config controls changeset filter to hgweb. Possible values are ``served``, ``visible`` and ``all``. Default is ``served``. The ``served`` filter only shows changesets that can be pulled from the hgweb instance. The``visible`` filter includes secret changesets but still excludes "hidden" one. See the repoview module for details. The option has been around undocumented since Mercurial 2.5, but no user ever asked about it. So we better keep it undocumented for now.""" viewconfig = repo.ui.config('web', 'view', 'served', untrusted=True) if viewconfig == 'all': return repo.unfiltered() elif viewconfig in repoview.filtertable: return repo.filtered(viewconfig) else: return repo.filtered('served')