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loggerhead/apps/transport.py
 
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# Copyright (C) 2008, 2009 Canonical Ltd.
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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#
 
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"""Serve branches at urls that mimic a transport's file system layout."""
 
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import threading
 
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from bzrlib import branch, errors, lru_cache, urlutils
 
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from bzrlib.config import LocationConfig
 
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from bzrlib.transport import get_transport
 
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from bzrlib.transport.http import wsgi
 
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from paste.request import path_info_pop
 
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from paste import httpexceptions
 
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from paste import urlparser
 
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from loggerhead.apps.branch import BranchWSGIApp
 
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from loggerhead.apps import favicon_app, static_app
 
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from loggerhead.controllers.directory_ui import DirectoryUI
 
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_bools = {
 
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    'yes': True, 'no': False,
 
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    'on': True, 'off': False,
 
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    '1': True, '0': False,
 
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    'true': True, 'false': False,
 
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    }
 
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class BranchesFromTransportServer(object):
 
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    def __init__(self, transport, root, name=None):
 
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        self.transport = transport
 
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        self.root = root
 
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        self.name = name
 
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        self._config = root._config
 
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    def app_for_branch(self, branch):
 
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        if not self.name:
 
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            name = branch._get_nick(local=True)
 
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            is_root = True
 
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        else:
 
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            name = self.name
 
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            is_root = False
 
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        branch_app = BranchWSGIApp(
 
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            branch,
 
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            name,
 
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            {'cachepath': self._config.SQL_DIR},
 
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            self.root.graph_cache,
 
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            is_root=is_root,
 
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            use_cdn=self._config.get_option('use_cdn'),
 
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            )
 
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        return branch_app.app
 
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    def app_for_non_branch(self, environ):
 
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        segment = path_info_pop(environ)
 
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        if segment is None:
 
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            raise httpexceptions.HTTPMovedPermanently(
 
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                environ['SCRIPT_NAME'] + '/')
 
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        elif segment == '':
 
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            if self.name:
 
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                name = self.name
 
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            else:
 
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                name = '/'
 
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            return DirectoryUI(
 
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                environ['loggerhead.static.url'], self.transport, name)
 
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        else:
 
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            new_transport = self.transport.clone(segment)
 
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            if self.name:
 
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                new_name = urlutils.join(self.name, segment)
 
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            else:
 
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                new_name = '/' + segment
 
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            return BranchesFromTransportServer(new_transport, self.root, new_name)
 
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    def app_for_bazaar_data(self, relpath):
 
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        if relpath == '/.bzr/smart':
 
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            wsgi_app = wsgi.SmartWSGIApp(self.transport)
 
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            return wsgi.RelpathSetter(wsgi_app, '', 'PATH_INFO')
 
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        else:
 
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            # TODO: Use something here that uses the transport API
 
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            # rather than relying on the local filesystem API.
 
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            base = self.transport.base
 
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            readonly_prefix = 'readonly+'
 
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            if base.startswith(readonly_prefix):
 
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                base = base[len(readonly_prefix):]
 
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            try:
 
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                path = urlutils.local_path_from_url(base)
 
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            except errors.InvalidURL:
 
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                raise httpexceptions.HTTPNotFound()
 
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            else:
 
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                return urlparser.make_static(None, path)
 
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    def check_serveable(self, config):
 
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        value = config.get_user_option('http_serve')
 
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        if value is None:
 
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            return
 
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        elif not _bools.get(value.lower(), True):
 
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            raise httpexceptions.HTTPNotFound()
 
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    def __call__(self, environ, start_response):
 
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        path = environ['PATH_INFO']
 
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        try:
 
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            b = branch.Branch.open_from_transport(self.transport)
 
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        except errors.NotBranchError:
 
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            if path.startswith('/.bzr'):
 
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                self.check_serveable(LocationConfig(self.transport.base))
 
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                return self.app_for_bazaar_data(path)(environ, start_response)
 
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            if not self.transport.listable() or not self.transport.has('.'):
 
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                raise httpexceptions.HTTPNotFound()
 
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            return self.app_for_non_branch(environ)(environ, start_response)
 
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        else:
 
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            self.check_serveable(b.get_config())
 
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            if path.startswith('/.bzr'):
 
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                return self.app_for_bazaar_data(path)(environ, start_response)
 
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            else:
 
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                return self.app_for_branch(b)(environ, start_response)
 
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_transport_store = threading.local()
 
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def get_transport_for_thread(base):
 
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    """ """
 
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    thread_transports = getattr(_transport_store, 'transports', None)
 
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    if thread_transports is None:
 
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        thread_transports = _transport_store.transports = {}
 
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    if base in thread_transports:
 
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        return thread_transports[base]
 
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    transport = get_transport(base)
 
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    return transport
 
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class BranchesFromTransportRoot(object):
 
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    def __init__(self, base, config):
 
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        self.graph_cache = lru_cache.LRUCache(10)
 
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        self.base = base
 
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        self._config = config
 
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    def __call__(self, environ, start_response):
 
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        environ['loggerhead.static.url'] = environ['SCRIPT_NAME']
 
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        if environ['PATH_INFO'].startswith('/static/'):
 
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            segment = path_info_pop(environ)
 
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            assert segment == 'static'
 
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            return static_app(environ, start_response)
 
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        elif environ['PATH_INFO'] == '/favicon.ico':
 
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            return favicon_app(environ, start_response)
 
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        else:
 
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            transport = get_transport_for_thread(self.base)
 
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            return BranchesFromTransportServer(
 
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                transport, self)(environ, start_response)
 
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class UserBranchesFromTransportRoot(object):
 
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    def __init__(self, base, config):
 
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        self.graph_cache = lru_cache.LRUCache(10)
 
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        self.base = base
 
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        self._config = config
 
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        self.trunk_dir = config.get_option('trunk_dir')
 
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    def __call__(self, environ, start_response):
 
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        environ['loggerhead.static.url'] = environ['SCRIPT_NAME']
 
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        path_info = environ['PATH_INFO']
 
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        if path_info.startswith('/static/'):
 
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            segment = path_info_pop(environ)
 
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            assert segment == 'static'
 
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            return static_app(environ, start_response)
 
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        elif path_info == '/favicon.ico':
 
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            return favicon_app(environ, start_response)
 
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        else:
 
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            transport = get_transport_for_thread(self.base)
 
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            # segments starting with ~ are user branches
 
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            if path_info.startswith('/~'):
 
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                segment = path_info_pop(environ)
 
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                return BranchesFromTransportServer(
 
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                    transport.clone(segment[1:]), self, segment)(
 
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                    environ, start_response)
 
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            else:
 
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                return BranchesFromTransportServer(
 
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                    transport.clone(self.trunk_dir), self)(
 
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                    environ, start_response)