exception: store orginal tb and exc inside the new exception passed to rhodecode from vcsserver.

vcsserver/base.py

@@ -1,91 +1,94 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2019 RhodeCode GmbH
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software Foundation,
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 
 import sys
 import traceback
 import logging
 import urlparse
 
 from vcsserver.lib.rc_cache import region_meta
 log = logging.getLogger(__name__)
 
 
 class RepoFactory(object):
     """
     Utility to create instances of repository
 
     It provides internal caching of the `repo` object based on
     the :term:`call context`.
     """
     repo_type = None
 
     def __init__(self):
         self._cache_region = region_meta.dogpile_cache_regions['repo_object']
 
     def _create_config(self, path, config):
         config = {}
         return config
 
     def _create_repo(self, wire, create):
         raise NotImplementedError()
 
     def repo(self, wire, create=False):
         """
         Get a repository instance for the given path.
 
         Uses internally the low level beaker API since the decorators introduce
         significant overhead.
         """
         region = self._cache_region
         context = wire.get('context', None)
         repo_path = wire.get('path', '')
         context_uid = '{}'.format(context)
         cache = wire.get('cache', True)
         cache_on = context and cache
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def create_new_repo(_repo_type, _repo_path, _context_uid):
             return self._create_repo(wire, create)
 
         repo = create_new_repo(self.repo_type, repo_path, context_uid)
         return repo
 
 
 def obfuscate_qs(query_string):
     if query_string is None:
         return None
 
     parsed = []
     for k, v in urlparse.parse_qsl(query_string, keep_blank_values=True):
         if k in ['auth_token', 'api_key']:
             v = "*****"
         parsed.append((k, v))
 
     return '&'.join('{}{}'.format(
         k, '={}'.format(v) if v else '') for k, v in parsed)
 
 
 def raise_from_original(new_type):
     """
     Raise a new exception type with original args and traceback.
     """
     exc_type, exc_value, exc_traceback = sys.exc_info()
+    new_exc = new_type(*exc_value.args)
+    # store the original traceback into the new exc
+    new_exc._org_exc_tb = traceback.format_exc(exc_traceback)
 
     try:
-        raise new_type(*exc_value.args), None, exc_traceback
+        raise new_exc, None, exc_traceback
     finally:
         del exc_traceback

vcsserver/exceptions.py

@@ -1,116 +1,117 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2019 RhodeCode GmbH
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software Foundation,
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 
 """
 Special exception handling over the wire.
 
 Since we cannot assume that our client is able to import our exception classes,
 this module provides a "wrapping" mechanism to raise plain exceptions
 which contain an extra attribute `_vcs_kind` to allow a client to distinguish
 different error conditions.
 """
 
 from pyramid.httpexceptions import HTTPLocked, HTTPForbidden
 
 
 def _make_exception(kind, org_exc, *args):
     """
     Prepares a base `Exception` instance to be sent over the wire.
 
     To give our caller a hint what this is about, it will attach an attribute
     `_vcs_kind` to the exception.
     """
     exc = Exception(*args)
     exc._vcs_kind = kind
     exc._org_exc = org_exc
+    exc._org_exc_tb = ''
     return exc
 
 
 def AbortException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('abort', org_exc, *args)
     return _make_exception_wrapper
 
 
 def ArchiveException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('archive', org_exc, *args)
     return _make_exception_wrapper
 
 
 def LookupException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('lookup', org_exc, *args)
     return _make_exception_wrapper
 
 
 def VcsException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('error', org_exc, *args)
     return _make_exception_wrapper
 
 
 def RepositoryLockedException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('repo_locked', org_exc, *args)
     return _make_exception_wrapper
 
 
 def RepositoryBranchProtectedException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('repo_branch_protected', org_exc, *args)
     return _make_exception_wrapper
 
 
 def RequirementException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('requirement', org_exc, *args)
     return _make_exception_wrapper
 
 
 def UnhandledException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('unhandled', org_exc, *args)
     return _make_exception_wrapper
 
 
 def URLError(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('url_error', org_exc, *args)
     return _make_exception_wrapper
 
 
 def SubrepoMergeException(org_exc=None):
     def _make_exception_wrapper(*args):
         return _make_exception('subrepo_merge_error', org_exc, *args)
     return _make_exception_wrapper
 
 
 class HTTPRepoLocked(HTTPLocked):
     """
     Subclass of HTTPLocked response that allows to set the title and status
     code via constructor arguments.
     """
     def __init__(self, title, status_code=None, **kwargs):
         self.code = status_code or HTTPLocked.code
         self.title = title
         super(HTTPRepoLocked, self).__init__(**kwargs)
 
 
 class HTTPRepoBranchProtected(HTTPForbidden):
     def __init__(self, *args, **kwargs):
         super(HTTPForbidden, self).__init__(*args, **kwargs)

vcsserver/http_main.py

@@ -1,607 +1,610 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2019 RhodeCode GmbH
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software Foundation,
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 
 import os
 import sys
 import base64
 import locale
 import logging
 import uuid
 import wsgiref.util
 import traceback
 import tempfile
 from itertools import chain
 
 import simplejson as json
 import msgpack
 from pyramid.config import Configurator
 from pyramid.settings import asbool, aslist
 from pyramid.wsgi import wsgiapp
 from pyramid.compat import configparser
 
 
 log = logging.getLogger(__name__)
 
 # due to Mercurial/glibc2.27 problems we need to detect if locale settings are
 # causing problems and "fix" it in case they do and fallback to LC_ALL = C
 
 try:
     locale.setlocale(locale.LC_ALL, '')
 except locale.Error as e:
     log.error(
         'LOCALE ERROR: failed to set LC_ALL, fallback to LC_ALL=C, org error: %s', e)
     os.environ['LC_ALL'] = 'C'
 
 import vcsserver
 from vcsserver import remote_wsgi, scm_app, settings, hgpatches
 from vcsserver.git_lfs.app import GIT_LFS_CONTENT_TYPE, GIT_LFS_PROTO_PAT
 from vcsserver.echo_stub import remote_wsgi as remote_wsgi_stub
 from vcsserver.echo_stub.echo_app import EchoApp
 from vcsserver.exceptions import HTTPRepoLocked, HTTPRepoBranchProtected
 from vcsserver.lib.exc_tracking import store_exception
 from vcsserver.server import VcsServer
 
 try:
     from vcsserver.git import GitFactory, GitRemote
 except ImportError:
     GitFactory = None
     GitRemote = None
 
 try:
     from vcsserver.hg import MercurialFactory, HgRemote
 except ImportError:
     MercurialFactory = None
     HgRemote = None
 
 try:
     from vcsserver.svn import SubversionFactory, SvnRemote
 except ImportError:
     SubversionFactory = None
     SvnRemote = None
 
 
 def _is_request_chunked(environ):
     stream = environ.get('HTTP_TRANSFER_ENCODING', '') == 'chunked'
     return stream
 
 
 def _int_setting(settings, name, default):
     settings[name] = int(settings.get(name, default))
     return settings[name]
 
 
 def _bool_setting(settings, name, default):
     input_val = settings.get(name, default)
     if isinstance(input_val, unicode):
         input_val = input_val.encode('utf8')
     settings[name] = asbool(input_val)
     return settings[name]
 
 
 def _list_setting(settings, name, default):
     raw_value = settings.get(name, default)
 
     # Otherwise we assume it uses pyramids space/newline separation.
     settings[name] = aslist(raw_value)
     return settings[name]
 
 
 def _string_setting(settings, name, default, lower=True, default_when_empty=False):
     value = settings.get(name, default)
 
     if default_when_empty and not value:
         # use default value when value is empty
         value = default
 
     if lower:
         value = value.lower()
     settings[name] = value
     return settings[name]
 
 
 class VCS(object):
     def __init__(self, locale=None, cache_config=None):
         self.locale = locale
         self.cache_config = cache_config
         self._configure_locale()
 
         if GitFactory and GitRemote:
             git_factory = GitFactory()
             self._git_remote = GitRemote(git_factory)
         else:
             log.info("Git client import failed")
 
         if MercurialFactory and HgRemote:
             hg_factory = MercurialFactory()
             self._hg_remote = HgRemote(hg_factory)
         else:
             log.info("Mercurial client import failed")
 
         if SubversionFactory and SvnRemote:
             svn_factory = SubversionFactory()
 
             # hg factory is used for svn url validation
             hg_factory = MercurialFactory()
             self._svn_remote = SvnRemote(svn_factory, hg_factory=hg_factory)
         else:
             log.info("Subversion client import failed")
 
         self._vcsserver = VcsServer()
 
     def _configure_locale(self):
         if self.locale:
             log.info('Settings locale: `LC_ALL` to %s', self.locale)
         else:
             log.info(
                 'Configuring locale subsystem based on environment variables')
         try:
             # If self.locale is the empty string, then the locale
             # module will use the environment variables. See the
             # documentation of the package `locale`.
             locale.setlocale(locale.LC_ALL, self.locale)
 
             language_code, encoding = locale.getlocale()
             log.info(
                 'Locale set to language code "%s" with encoding "%s".',
                 language_code, encoding)
         except locale.Error:
             log.exception(
                 'Cannot set locale, not configuring the locale system')
 
 
 class WsgiProxy(object):
     def __init__(self, wsgi):
         self.wsgi = wsgi
 
     def __call__(self, environ, start_response):
         input_data = environ['wsgi.input'].read()
         input_data = msgpack.unpackb(input_data)
 
         error = None
         try:
             data, status, headers = self.wsgi.handle(
                 input_data['environment'], input_data['input_data'],
                 *input_data['args'], **input_data['kwargs'])
         except Exception as e:
             data, status, headers = [], None, None
             error = {
                 'message': str(e),
                 '_vcs_kind': getattr(e, '_vcs_kind', None)
             }
 
         start_response(200, {})
         return self._iterator(error, status, headers, data)
 
     def _iterator(self, error, status, headers, data):
         initial_data = [
             error,
             status,
             headers,
         ]
 
         for d in chain(initial_data, data):
             yield msgpack.packb(d)
 
 
 def not_found(request):
     return {'status': '404 NOT FOUND'}
 
 
 class VCSViewPredicate(object):
     def __init__(self, val, config):
         self.remotes = val
 
     def text(self):
         return 'vcs view method = %s' % (self.remotes.keys(),)
 
     phash = text
 
     def __call__(self, context, request):
         """
         View predicate that returns true if given backend is supported by
         defined remotes.
         """
         backend = request.matchdict.get('backend')
         return backend in self.remotes
 
 
 class HTTPApplication(object):
     ALLOWED_EXCEPTIONS = ('KeyError', 'URLError')
 
     remote_wsgi = remote_wsgi
     _use_echo_app = False
 
     def __init__(self, settings=None, global_config=None):
         self._sanitize_settings_and_apply_defaults(settings)
 
         self.config = Configurator(settings=settings)
         self.global_config = global_config
         self.config.include('vcsserver.lib.rc_cache')
 
         locale = settings.get('locale', '') or 'en_US.UTF-8'
         vcs = VCS(locale=locale, cache_config=settings)
         self._remotes = {
             'hg': vcs._hg_remote,
             'git': vcs._git_remote,
             'svn': vcs._svn_remote,
             'server': vcs._vcsserver,
         }
         if settings.get('dev.use_echo_app', 'false').lower() == 'true':
             self._use_echo_app = True
             log.warning("Using EchoApp for VCS operations.")
             self.remote_wsgi = remote_wsgi_stub
 
         self._configure_settings(global_config, settings)
         self._configure()
 
     def _configure_settings(self, global_config, app_settings):
         """
         Configure the settings module.
         """
         settings_merged = global_config.copy()
         settings_merged.update(app_settings)
 
         git_path = app_settings.get('git_path', None)
         if git_path:
             settings.GIT_EXECUTABLE = git_path
         binary_dir = app_settings.get('core.binary_dir', None)
         if binary_dir:
             settings.BINARY_DIR = binary_dir
 
         # Store the settings to make them available to other modules.
         vcsserver.PYRAMID_SETTINGS = settings_merged
         vcsserver.CONFIG = settings_merged
 
     def _sanitize_settings_and_apply_defaults(self, settings):
         temp_store = tempfile.gettempdir()
         default_cache_dir = os.path.join(temp_store, 'rc_cache')
 
         # save default, cache dir, and use it for all backends later.
         default_cache_dir = _string_setting(
             settings,
             'cache_dir',
             default_cache_dir, lower=False, default_when_empty=True)
 
         # ensure we have our dir created
         if not os.path.isdir(default_cache_dir):
             os.makedirs(default_cache_dir, mode=0o755)
 
         # exception store cache
         _string_setting(
             settings,
             'exception_tracker.store_path',
             temp_store, lower=False, default_when_empty=True)
 
         # repo_object cache
         _string_setting(
             settings,
             'rc_cache.repo_object.backend',
             'dogpile.cache.rc.memory_lru')
         _int_setting(
             settings,
             'rc_cache.repo_object.expiration_time',
             300)
         _int_setting(
             settings,
             'rc_cache.repo_object.max_size',
             1024)
 
     def _configure(self):
         self.config.add_renderer(name='msgpack', factory=self._msgpack_renderer_factory)
 
         self.config.add_route('service', '/_service')
         self.config.add_route('status', '/status')
         self.config.add_route('hg_proxy', '/proxy/hg')
         self.config.add_route('git_proxy', '/proxy/git')
         self.config.add_route('vcs', '/{backend}')
         self.config.add_route('stream_git', '/stream/git/*repo_name')
         self.config.add_route('stream_hg', '/stream/hg/*repo_name')
 
         self.config.add_view(self.status_view, route_name='status', renderer='json')
         self.config.add_view(self.service_view, route_name='service', renderer='msgpack')
 
         self.config.add_view(self.hg_proxy(), route_name='hg_proxy')
         self.config.add_view(self.git_proxy(), route_name='git_proxy')
         self.config.add_view(self.vcs_view, route_name='vcs', renderer='msgpack',
                              vcs_view=self._remotes)
 
         self.config.add_view(self.hg_stream(), route_name='stream_hg')
         self.config.add_view(self.git_stream(), route_name='stream_git')
 
         self.config.add_view_predicate('vcs_view', VCSViewPredicate)
 
         self.config.add_notfound_view(not_found, renderer='json')
 
         self.config.add_view(self.handle_vcs_exception, context=Exception)
 
         self.config.add_tween(
             'vcsserver.tweens.RequestWrapperTween',
         )
 
     def wsgi_app(self):
         return self.config.make_wsgi_app()
 
     def vcs_view(self, request):
         remote = self._remotes[request.matchdict['backend']]
         payload = msgpack.unpackb(request.body, use_list=True)
         method = payload.get('method')
         params = payload.get('params')
         wire = params.get('wire')
         args = params.get('args')
         kwargs = params.get('kwargs')
         context_uid = None
 
         if wire:
             try:
                 wire['context'] = context_uid = uuid.UUID(wire['context'])
             except KeyError:
                 pass
             args.insert(0, wire)
 
         log.debug('method called:%s with kwargs:%s context_uid: %s',
                   method, kwargs, context_uid)
         try:
             resp = getattr(remote, method)(*args, **kwargs)
         except Exception as e:
             exc_info = list(sys.exc_info())
             exc_type, exc_value, exc_traceback = exc_info
 
             org_exc = getattr(e, '_org_exc', None)
             org_exc_name = None
+            org_exc_tb = ''
             if org_exc:
                 org_exc_name = org_exc.__class__.__name__
+                org_exc_tb = getattr(e, '_org_exc_tb', '')
                 # replace our "faked" exception with our org
                 exc_info[0] = org_exc.__class__
                 exc_info[1] = org_exc
 
             store_exception(id(exc_info), exc_info)
 
             tb_info = ''.join(
                 traceback.format_exception(exc_type, exc_value, exc_traceback))
 
             type_ = e.__class__.__name__
             if type_ not in self.ALLOWED_EXCEPTIONS:
                 type_ = None
 
             resp = {
                 'id': payload.get('id'),
                 'error': {
                     'message': e.message,
                     'traceback': tb_info,
                     'org_exc': org_exc_name,
+                    'org_exc_tb': org_exc_tb,
                     'type': type_
                 }
             }
             try:
                 resp['error']['_vcs_kind'] = getattr(e, '_vcs_kind', None)
             except AttributeError:
                 pass
         else:
             resp = {
                 'id': payload.get('id'),
                 'result': resp
             }
 
         return resp
 
     def status_view(self, request):
         import vcsserver
         return {'status': 'OK', 'vcsserver_version': vcsserver.__version__,
                 'pid': os.getpid()}
 
     def service_view(self, request):
         import vcsserver
 
         payload = msgpack.unpackb(request.body, use_list=True)
 
         try:
             path = self.global_config['__file__']
             config = configparser.ConfigParser()
             config.read(path)
             parsed_ini = config
             if parsed_ini.has_section('server:main'):
                 parsed_ini = dict(parsed_ini.items('server:main'))
         except Exception:
             log.exception('Failed to read .ini file for display')
             parsed_ini = {}
 
         resp = {
             'id': payload.get('id'),
             'result': dict(
                 version=vcsserver.__version__,
                 config=parsed_ini,
                 payload=payload,
             )
         }
         return resp
 
     def _msgpack_renderer_factory(self, info):
         def _render(value, system):
             value = msgpack.packb(value)
             request = system.get('request')
             if request is not None:
                 response = request.response
                 ct = response.content_type
                 if ct == response.default_content_type:
                     response.content_type = 'application/x-msgpack'
             return value
         return _render
 
     def set_env_from_config(self, environ, config):
         dict_conf = {}
         try:
             for elem in config:
                 if elem[0] == 'rhodecode':
                     dict_conf = json.loads(elem[2])
                     break
         except Exception:
             log.exception('Failed to fetch SCM CONFIG')
             return
 
         username = dict_conf.get('username')
         if username:
             environ['REMOTE_USER'] = username
             # mercurial specific, some extension api rely on this
             environ['HGUSER'] = username
 
         ip = dict_conf.get('ip')
         if ip:
             environ['REMOTE_HOST'] = ip
 
         if _is_request_chunked(environ):
             # set the compatibility flag for webob
             environ['wsgi.input_terminated'] = True
 
     def hg_proxy(self):
         @wsgiapp
         def _hg_proxy(environ, start_response):
             app = WsgiProxy(self.remote_wsgi.HgRemoteWsgi())
             return app(environ, start_response)
         return _hg_proxy
 
     def git_proxy(self):
         @wsgiapp
         def _git_proxy(environ, start_response):
             app = WsgiProxy(self.remote_wsgi.GitRemoteWsgi())
             return app(environ, start_response)
         return _git_proxy
 
     def hg_stream(self):
         if self._use_echo_app:
             @wsgiapp
             def _hg_stream(environ, start_response):
                 app = EchoApp('fake_path', 'fake_name', None)
                 return app(environ, start_response)
             return _hg_stream
         else:
             @wsgiapp
             def _hg_stream(environ, start_response):
                 log.debug('http-app: handling hg stream')
                 repo_path = environ['HTTP_X_RC_REPO_PATH']
                 repo_name = environ['HTTP_X_RC_REPO_NAME']
                 packed_config = base64.b64decode(
                     environ['HTTP_X_RC_REPO_CONFIG'])
                 config = msgpack.unpackb(packed_config)
                 app = scm_app.create_hg_wsgi_app(
                     repo_path, repo_name, config)
 
                 # Consistent path information for hgweb
                 environ['PATH_INFO'] = environ['HTTP_X_RC_PATH_INFO']
                 environ['REPO_NAME'] = repo_name
                 self.set_env_from_config(environ, config)
 
                 log.debug('http-app: starting app handler '
                           'with %s and process request', app)
                 return app(environ, ResponseFilter(start_response))
             return _hg_stream
 
     def git_stream(self):
         if self._use_echo_app:
             @wsgiapp
             def _git_stream(environ, start_response):
                 app = EchoApp('fake_path', 'fake_name', None)
                 return app(environ, start_response)
             return _git_stream
         else:
             @wsgiapp
             def _git_stream(environ, start_response):
                 log.debug('http-app: handling git stream')
                 repo_path = environ['HTTP_X_RC_REPO_PATH']
                 repo_name = environ['HTTP_X_RC_REPO_NAME']
                 packed_config = base64.b64decode(
                     environ['HTTP_X_RC_REPO_CONFIG'])
                 config = msgpack.unpackb(packed_config)
 
                 environ['PATH_INFO'] = environ['HTTP_X_RC_PATH_INFO']
                 self.set_env_from_config(environ, config)
 
                 content_type = environ.get('CONTENT_TYPE', '')
 
                 path = environ['PATH_INFO']
                 is_lfs_request = GIT_LFS_CONTENT_TYPE in content_type
                 log.debug(
                     'LFS: Detecting if request `%s` is LFS server path based '
                     'on content type:`%s`, is_lfs:%s',
                     path, content_type, is_lfs_request)
 
                 if not is_lfs_request:
                     # fallback detection by path
                     if GIT_LFS_PROTO_PAT.match(path):
                         is_lfs_request = True
                     log.debug(
                         'LFS: fallback detection by path of: `%s`, is_lfs:%s',
                         path, is_lfs_request)
 
                 if is_lfs_request:
                     app = scm_app.create_git_lfs_wsgi_app(
                         repo_path, repo_name, config)
                 else:
                     app = scm_app.create_git_wsgi_app(
                         repo_path, repo_name, config)
 
                 log.debug('http-app: starting app handler '
                           'with %s and process request', app)
 
                 return app(environ, start_response)
 
             return _git_stream
 
     def handle_vcs_exception(self, exception, request):
         _vcs_kind = getattr(exception, '_vcs_kind', '')
         if _vcs_kind == 'repo_locked':
             # Get custom repo-locked status code if present.
             status_code = request.headers.get('X-RC-Locked-Status-Code')
             return HTTPRepoLocked(
                 title=exception.message, status_code=status_code)
 
         elif _vcs_kind == 'repo_branch_protected':
             # Get custom repo-branch-protected status code if present.
             return HTTPRepoBranchProtected(title=exception.message)
 
         exc_info = request.exc_info
         store_exception(id(exc_info), exc_info)
 
         traceback_info = 'unavailable'
         if request.exc_info:
             exc_type, exc_value, exc_tb = request.exc_info
             traceback_info = ''.join(traceback.format_exception(exc_type, exc_value, exc_tb))
 
         log.error(
             'error occurred handling this request for path: %s, \n tb: %s',
             request.path, traceback_info)
         raise exception
 
 
 class ResponseFilter(object):
 
     def __init__(self, start_response):
         self._start_response = start_response
 
     def __call__(self, status, response_headers, exc_info=None):
         headers = tuple(
             (h, v) for h, v in response_headers
             if not wsgiref.util.is_hop_by_hop(h))
         return self._start_response(status, headers, exc_info)
 
 
 def main(global_config, **settings):
     if MercurialFactory:
         hgpatches.patch_largefiles_capabilities()
         hgpatches.patch_subrepo_type_mapping()
 
     app = HTTPApplication(settings=settings, global_config=global_config)
     return app.wsgi_app()