mercurial/hgweb/hgwebdir_mod.py

ancestor: a new algorithm that is faster for nodes near tip

Instead of walking all the way to the root of the DAG, we generate
a set of candidate GCA revs, then figure out which ones will win
the race to the root (usually without needing to traverse all the
way to the root).

In the common case of nodes that are close to each other in both
revision number and topology, this is usually a big win: it makes
"hg --time debugancestors" up to 9 times faster than the more general
ancestor function when measured on heads of the linux-2.6 hg repo.

Victory is not assured, however. The older function can still win
by a large margin if one node is much closer to the root than the
other, or by a much smaller amount if one is an ancestor of the
other.

For now, we've also got a small paranoid harness function that calls
both ancestor functions on every input and ensures that they give
equivalent answers.

Even without the checker function, the old ancestor function needs
to stay alive for the time being, as its generality is used by
context.filectx.merge.

# hgweb/hgwebdir_mod.py - Web interface for a directory of repositories.
#
# Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
# Copyright 2005, 2006 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import os, re, time
from mercurial.i18n import _
from mercurial import ui, hg, scmutil, util, templater
from mercurial import error, encoding
from common import ErrorResponse, get_mtime, staticfile, paritygen, \
                   get_contact, HTTP_OK, HTTP_NOT_FOUND, HTTP_SERVER_ERROR
from hgweb_mod import hgweb, makebreadcrumb
from request import wsgirequest
import webutil

def cleannames(items):
    return [(util.pconvert(name).strip('/'), path) for name, path in items]

def findrepos(paths):
    repos = []
    for prefix, root in cleannames(paths):
        roothead, roottail = os.path.split(root)
        # "foo = /bar/*" or "foo = /bar/**" lets every repo /bar/N in or below
        # /bar/ be served as as foo/N .
        # '*' will not search inside dirs with .hg (except .hg/patches),
        # '**' will search inside dirs with .hg (and thus also find subrepos).
        try:
            recurse = {'*': False, '**': True}[roottail]
        except KeyError:
            repos.append((prefix, root))
            continue
        roothead = os.path.normpath(os.path.abspath(roothead))
        paths = scmutil.walkrepos(roothead, followsym=True, recurse=recurse)
        repos.extend(urlrepos(prefix, roothead, paths))
    return repos

def urlrepos(prefix, roothead, paths):
    """yield url paths and filesystem paths from a list of repo paths

    >>> conv = lambda seq: [(v, util.pconvert(p)) for v,p in seq]
    >>> conv(urlrepos('hg', '/opt', ['/opt/r', '/opt/r/r', '/opt']))
    [('hg/r', '/opt/r'), ('hg/r/r', '/opt/r/r'), ('hg', '/opt')]
    >>> conv(urlrepos('', '/opt', ['/opt/r', '/opt/r/r', '/opt']))
    [('r', '/opt/r'), ('r/r', '/opt/r/r'), ('', '/opt')]
    """
    for path in paths:
        path = os.path.normpath(path)
        yield (prefix + '/' +
               util.pconvert(path[len(roothead):]).lstrip('/')).strip('/'), path

def geturlcgivars(baseurl, port):
    """
    Extract CGI variables from baseurl

    >>> geturlcgivars("http://host.org/base", "80")
    ('host.org', '80', '/base')
    >>> geturlcgivars("http://host.org:8000/base", "80")
    ('host.org', '8000', '/base')
    >>> geturlcgivars('/base', 8000)
    ('', '8000', '/base')
    >>> geturlcgivars("base", '8000')
    ('', '8000', '/base')
    >>> geturlcgivars("http://host", '8000')
    ('host', '8000', '/')
    >>> geturlcgivars("http://host/", '8000')
    ('host', '8000', '/')
    """
    u = util.url(baseurl)
    name = u.host or ''
    if u.port:
        port = u.port
    path = u.path or ""
    if not path.startswith('/'):
        path = '/' + path

    return name, str(port), path

class hgwebdir(object):
    refreshinterval = 20

    def __init__(self, conf, baseui=None):
        self.conf = conf
        self.baseui = baseui
        self.lastrefresh = 0
        self.motd = None
        self.refresh()

    def refresh(self):
        if self.lastrefresh + self.refreshinterval > time.time():
            return

        if self.baseui:
            u = self.baseui.copy()
        else:
            u = ui.ui()
            u.setconfig('ui', 'report_untrusted', 'off')
            u.setconfig('ui', 'nontty', 'true')

        if not isinstance(self.conf, (dict, list, tuple)):
            map = {'paths': 'hgweb-paths'}
            if not os.path.exists(self.conf):
                raise util.Abort(_('config file %s not found!') % self.conf)
            u.readconfig(self.conf, remap=map, trust=True)
            paths = []
            for name, ignored in u.configitems('hgweb-paths'):
                for path in u.configlist('hgweb-paths', name):
                    paths.append((name, path))
        elif isinstance(self.conf, (list, tuple)):
            paths = self.conf
        elif isinstance(self.conf, dict):
            paths = self.conf.items()

        repos = findrepos(paths)
        for prefix, root in u.configitems('collections'):
            prefix = util.pconvert(prefix)
            for path in scmutil.walkrepos(root, followsym=True):
                repo = os.path.normpath(path)
                name = util.pconvert(repo)
                if name.startswith(prefix):
                    name = name[len(prefix):]
                repos.append((name.lstrip('/'), repo))

        self.repos = repos
        self.ui = u
        encoding.encoding = self.ui.config('web', 'encoding',
                                           encoding.encoding)
        self.style = self.ui.config('web', 'style', 'paper')
        self.templatepath = self.ui.config('web', 'templates', None)
        self.stripecount = self.ui.config('web', 'stripes', 1)
        if self.stripecount:
            self.stripecount = int(self.stripecount)
        self._baseurl = self.ui.config('web', 'baseurl')
        prefix = self.ui.config('web', 'prefix', '')
        if prefix.startswith('/'):
            prefix = prefix[1:]
        if prefix.endswith('/'):
            prefix = prefix[:-1]
        self.prefix = prefix
        self.lastrefresh = time.time()

    def run(self):
        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):
        req = wsgirequest(env, respond)
        return self.run_wsgi(req)

    def read_allowed(self, ui, req):
        """Check allow_read and deny_read config options of a repo's ui object
        to determine user permissions.  By default, with neither option set (or
        both empty), allow all users to read the repo.  There are two ways a
        user can be denied read access:  (1) deny_read is not empty, and the
        user is unauthenticated or deny_read contains user (or *), and (2)
        allow_read is not empty and the user is not in allow_read.  Return True
        if user is allowed to read the repo, else return False."""

        user = req.env.get('REMOTE_USER')

        deny_read = ui.configlist('web', 'deny_read', untrusted=True)
        if deny_read and (not user or deny_read == ['*'] or user in deny_read):
            return False

        allow_read = ui.configlist('web', 'allow_read', untrusted=True)
        # by default, allow reading if no allow_read option has been set
        if (not allow_read) or (allow_read == ['*']) or (user in allow_read):
            return True

        return False

    def run_wsgi(self, req):
        try:
            try:
                self.refresh()

                virtual = req.env.get("PATH_INFO", "").strip('/')
                tmpl = self.templater(req)
                ctype = tmpl('mimetype', encoding=encoding.encoding)
                ctype = templater.stringify(ctype)

                # a static file
                if virtual.startswith('static/') or 'static' in req.form:
                    if virtual.startswith('static/'):
                        fname = virtual[7:]
                    else:
                        fname = req.form['static'][0]
                    static = self.ui.config("web", "static", None,
                                            untrusted=False)
                    if not static:
                        tp = self.templatepath or templater.templatepath()
                        if isinstance(tp, str):
                            tp = [tp]
                        static = [os.path.join(p, 'static') for p in tp]
                    staticfile(static, fname, req)
                    return []

                # top-level index
                elif not virtual:
                    req.respond(HTTP_OK, ctype)
                    return self.makeindex(req, tmpl)

                # nested indexes and hgwebs

                repos = dict(self.repos)
                virtualrepo = virtual
                while virtualrepo:
                    real = repos.get(virtualrepo)
                    if real:
                        req.env['REPO_NAME'] = virtualrepo
                        try:
                            repo = hg.repository(self.ui, real)
                            return hgweb(repo).run_wsgi(req)
                        except IOError, inst:
                            msg = inst.strerror
                            raise ErrorResponse(HTTP_SERVER_ERROR, msg)
                        except error.RepoError, inst:
                            raise ErrorResponse(HTTP_SERVER_ERROR, str(inst))

                    up = virtualrepo.rfind('/')
                    if up < 0:
                        break
                    virtualrepo = virtualrepo[:up]

                # browse subdirectories
                subdir = virtual + '/'
                if [r for r in repos if r.startswith(subdir)]:
                    req.respond(HTTP_OK, ctype)
                    return self.makeindex(req, tmpl, subdir)

                # prefixes not found
                req.respond(HTTP_NOT_FOUND, ctype)
                return tmpl("notfound", repo=virtual)

            except ErrorResponse, err:
                req.respond(err, ctype)
                return tmpl('error', error=err.message or '')
        finally:
            tmpl = None

    def makeindex(self, req, tmpl, subdir=""):

        def archivelist(ui, nodeid, url):
            allowed = ui.configlist("web", "allow_archive", untrusted=True)
            archives = []
            for i in [('zip', '.zip'), ('gz', '.tar.gz'), ('bz2', '.tar.bz2')]:
                if i[0] in allowed or ui.configbool("web", "allow" + i[0],
                                                    untrusted=True):
                    archives.append({"type" : i[0], "extension": i[1],
                                     "node": nodeid, "url": url})
            return archives

        def rawentries(subdir="", **map):

            descend = self.ui.configbool('web', 'descend', True)
            collapse = self.ui.configbool('web', 'collapse', False)
            seenrepos = set()
            seendirs = set()
            for name, path in self.repos:

                if not name.startswith(subdir):
                    continue
                name = name[len(subdir):]
                directory = False

                if '/' in name:
                    if not descend:
                        continue

                    nameparts = name.split('/')
                    rootname = nameparts[0]

                    if not collapse:
                        pass
                    elif rootname in seendirs:
                        continue
                    elif rootname in seenrepos:
                        pass
                    else:
                        directory = True
                        name = rootname

                        # redefine the path to refer to the directory
                        discarded = '/'.join(nameparts[1:])

                        # remove name parts plus accompanying slash
                        path = path[:-len(discarded) - 1]

                parts = [name]
                if 'PATH_INFO' in req.env:
                    parts.insert(0, req.env['PATH_INFO'].rstrip('/'))
                if req.env['SCRIPT_NAME']:
                    parts.insert(0, req.env['SCRIPT_NAME'])
                url = re.sub(r'/+', '/', '/'.join(parts) + '/')

                # show either a directory entry or a repository
                if directory:
                    # get the directory's time information
                    try:
                        d = (get_mtime(path), util.makedate()[1])
                    except OSError:
                        continue

                    # add '/' to the name to make it obvious that
                    # the entry is a directory, not a regular repository
                    row = dict(contact="",
                               contact_sort="",
                               name=name + '/',
                               name_sort=name,
                               url=url,
                               description="",
                               description_sort="",
                               lastchange=d,
                               lastchange_sort=d[1]-d[0],
                               archives=[],
                               isdirectory=True)

                    seendirs.add(name)
                    yield row
                    continue

                u = self.ui.copy()
                try:
                    u.readconfig(os.path.join(path, '.hg', 'hgrc'))
                except Exception, e:
                    u.warn(_('error reading %s/.hg/hgrc: %s\n') % (path, e))
                    continue
                def get(section, name, default=None):
                    return u.config(section, name, default, untrusted=True)

                if u.configbool("web", "hidden", untrusted=True):
                    continue

                if not self.read_allowed(u, req):
                    continue

                # update time with local timezone
                try:
                    r = hg.repository(self.ui, path)
                except IOError:
                    u.warn(_('error accessing repository at %s\n') % path)
                    continue
                except error.RepoError:
                    u.warn(_('error accessing repository at %s\n') % path)
                    continue
                try:
                    d = (get_mtime(r.spath), util.makedate()[1])
                except OSError:
                    continue

                contact = get_contact(get)
                description = get("web", "description", "")
                name = get("web", "name", name)
                row = dict(contact=contact or "unknown",
                           contact_sort=contact.upper() or "unknown",
                           name=name,
                           name_sort=name,
                           url=url,
                           description=description or "unknown",
                           description_sort=description.upper() or "unknown",
                           lastchange=d,
                           lastchange_sort=d[1]-d[0],
                           archives=archivelist(u, "tip", url))

                seenrepos.add(name)
                yield row

        sortdefault = None, False
        def entries(sortcolumn="", descending=False, subdir="", **map):
            rows = rawentries(subdir=subdir, **map)

            if sortcolumn and sortdefault != (sortcolumn, descending):
                sortkey = '%s_sort' % sortcolumn
                rows = sorted(rows, key=lambda x: x[sortkey],
                              reverse=descending)
            for row, parity in zip(rows, paritygen(self.stripecount)):
                row['parity'] = parity
                yield row

        self.refresh()
        sortable = ["name", "description", "contact", "lastchange"]
        sortcolumn, descending = sortdefault
        if 'sort' in req.form:
            sortcolumn = req.form['sort'][0]
            descending = sortcolumn.startswith('-')
            if descending:
                sortcolumn = sortcolumn[1:]
            if sortcolumn not in sortable:
                sortcolumn = ""

        sort = [("sort_%s" % column,
                 "%s%s" % ((not descending and column == sortcolumn)
                            and "-" or "", column))
                for column in sortable]

        self.refresh()
        self.updatereqenv(req.env)

        return tmpl("index", entries=entries, subdir=subdir,
                    pathdef=makebreadcrumb('/' + subdir, self.prefix),
                    sortcolumn=sortcolumn, descending=descending,
                    **dict(sort))

    def templater(self, req):

        def header(**map):
            yield tmpl('header', encoding=encoding.encoding, **map)

        def footer(**map):
            yield tmpl("footer", **map)

        def motd(**map):
            if self.motd is not None:
                yield self.motd
            else:
                yield config('web', 'motd', '')

        def config(section, name, default=None, untrusted=True):
            return self.ui.config(section, name, default, untrusted)

        self.updatereqenv(req.env)

        url = req.env.get('SCRIPT_NAME', '')
        if not url.endswith('/'):
            url += '/'

        vars = {}
        styles = (
            req.form.get('style', [None])[0],
            config('web', 'style'),
            'paper'
        )
        style, mapfile = templater.stylemap(styles, self.templatepath)
        if style == styles[0]:
            vars['style'] = style

        start = url[-1] == '?' and '&' or '?'
        sessionvars = webutil.sessionvars(vars, start)
        logourl = config('web', 'logourl', 'http://mercurial.selenic.com/')
        logoimg = config('web', 'logoimg', 'hglogo.png')
        staticurl = config('web', 'staticurl') or url + 'static/'
        if not staticurl.endswith('/'):
            staticurl += '/'

        tmpl = templater.templater(mapfile,
                                   defaults={"header": header,
                                             "footer": footer,
                                             "motd": motd,
                                             "url": url,
                                             "logourl": logourl,
                                             "logoimg": logoimg,
                                             "staticurl": staticurl,
                                             "sessionvars": sessionvars})
        return tmpl

    def updatereqenv(self, env):
        if self._baseurl is not None:
            name, port, path = geturlcgivars(self._baseurl, env['SERVER_PORT'])
            env['SERVER_NAME'] = name
            env['SERVER_PORT'] = port
            env['SCRIPT_NAME'] = path