exc-tracking: use more rich style tracebacks.

vcsserver/base.py

@@ -1,194 +1,193 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2023 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 tempfile
-import traceback
 import logging
 import urllib.parse
 
 from vcsserver.lib.rc_cache.archive_cache import get_archival_cache_store
 
 from vcsserver import exceptions
 from vcsserver.exceptions import NoContentException
 from vcsserver.hgcompat import archival
 from vcsserver.str_utils import safe_bytes
-
+from vcsserver.lib.exc_tracking import format_exc
 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):
         pass
 
     def _create_config(self, path, config):
         config = {}
         return config
 
     def _create_repo(self, wire, create):
         raise NotImplementedError()
 
     def repo(self, wire, create=False):
         raise NotImplementedError()
 
 
 def obfuscate_qs(query_string):
     if query_string is None:
         return None
 
     parsed = []
     for k, v in urllib.parse.parse_qsl(query_string, keep_blank_values=True):
         if k in ['auth_token', 'api_key']:
             v = "*****"
         parsed.append((k, v))
 
     return '&'.join('{}{}'.format(
         k, f'={v}' if v else '') for k, v in parsed)
 
 
 def raise_from_original(new_type, org_exc: Exception):
     """
     Raise a new exception type with original args and traceback.
     """
-
-    exc_type, exc_value, exc_traceback = sys.exc_info()
+    exc_info = sys.exc_info()
+    exc_type, exc_value, exc_traceback = exc_info
     new_exc = new_type(*exc_value.args)
 
     # store the original traceback into the new exc
-    new_exc._org_exc_tb = traceback.format_tb(exc_traceback)
+    new_exc._org_exc_tb = format_exc(exc_info)
 
     try:
         raise new_exc.with_traceback(exc_traceback)
     finally:
         del exc_traceback
 
 
 class ArchiveNode(object):
     def __init__(self, path, mode, is_link, raw_bytes):
         self.path = path
         self.mode = mode
         self.is_link = is_link
         self.raw_bytes = raw_bytes
 
 
 def store_archive_in_cache(node_walker, archive_key, kind, mtime, archive_at_path, archive_dir_name,
                            commit_id, write_metadata=True, extra_metadata=None, cache_config=None):
     """
     Function that would store generate archive and send it to a dedicated backend store
     In here we use diskcache
 
     :param node_walker: a generator returning nodes to add to archive
     :param archive_key: key used to store the path
     :param kind: archive kind
     :param mtime: time of creation
     :param archive_at_path: default '/' the path at archive was started.
         If this is not '/' it means it's a partial archive
     :param archive_dir_name: inside dir name when creating an archive
     :param commit_id: commit sha of revision archive was created at
     :param write_metadata:
     :param extra_metadata:
     :param cache_config:
 
     walker should be a file walker, for example,
         def node_walker():
             for file_info in files:
                 yield ArchiveNode(fn, mode, is_link, ctx[fn].data)
     """
     extra_metadata = extra_metadata or {}
 
     d_cache = get_archival_cache_store(config=cache_config)
 
     if archive_key in d_cache:
         with d_cache as d_cache_reader:
             reader, tag = d_cache_reader.get(archive_key, read=True, tag=True, retry=True)
             return reader.name
 
     archive_tmp_path = safe_bytes(tempfile.mkstemp()[1])
     log.debug('Creating new temp archive in %s', archive_tmp_path)
 
     if kind == "tgz":
         archiver = archival.tarit(archive_tmp_path, mtime, b"gz")
     elif kind == "tbz2":
         archiver = archival.tarit(archive_tmp_path, mtime, b"bz2")
     elif kind == 'zip':
         archiver = archival.zipit(archive_tmp_path, mtime)
     else:
         raise exceptions.ArchiveException()(
             f'Remote does not support: "{kind}" archive type.')
 
     for f in node_walker(commit_id, archive_at_path):
         f_path = os.path.join(safe_bytes(archive_dir_name), safe_bytes(f.path).lstrip(b'/'))
         try:
             archiver.addfile(f_path, f.mode, f.is_link, f.raw_bytes())
         except NoContentException:
             # NOTE(marcink): this is a special case for SVN so we can create "empty"
             # directories which are not supported by archiver
             archiver.addfile(os.path.join(f_path, b'.dir'), f.mode, f.is_link, b'')
 
     if write_metadata:
         metadata = dict([
             ('commit_id', commit_id),
             ('mtime', mtime),
         ])
         metadata.update(extra_metadata)
 
         meta = [safe_bytes(f"{f_name}:{value}") for f_name, value in metadata.items()]
         f_path = os.path.join(safe_bytes(archive_dir_name), b'.archival.txt')
         archiver.addfile(f_path, 0o644, False, b'\n'.join(meta))
 
     archiver.done()
 
     # ensure set & get are atomic
     with d_cache.transact():
 
         with open(archive_tmp_path, 'rb') as archive_file:
             add_result = d_cache.set(archive_key, archive_file, read=True, tag='db-name', retry=True)
             if not add_result:
                 log.error('Failed to store cache for key=%s', archive_key)
 
         os.remove(archive_tmp_path)
 
         reader, tag = d_cache.get(archive_key, read=True, tag=True, retry=True)
         if not reader:
             raise AssertionError(f'empty reader on key={archive_key} added={add_result}')
 
         return reader.name
 
 
 class BinaryEnvelope(object):
     def __init__(self, val):
         self.val = val
 
 
 class BytesEnvelope(bytes):
     def __new__(cls, content):
         if isinstance(content, bytes):
             return super().__new__(cls, content)
         else:
             raise TypeError('BytesEnvelope content= param must be bytes. Use BinaryEnvelope to wrap other types')
 
 
 class BinaryBytesEnvelope(BytesEnvelope):
     pass

vcsserver/http_main.py

@@ -1,777 +1,774 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2023 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 io
 import os
 import sys
 import locale
 import logging
 import uuid
 import time
 import wsgiref.util
-import traceback
 import tempfile
 import psutil
 
 from itertools import chain
 
 import msgpack
 import configparser
 
 from pyramid.config import Configurator
 from pyramid.wsgi import wsgiapp
 from pyramid.response import Response
 
 from vcsserver.base import BytesEnvelope, BinaryEnvelope
 from vcsserver.lib.rc_json import json
 from vcsserver.config.settings_maker import SettingsMaker
 from vcsserver.str_utils import safe_int
 from vcsserver.lib.statsd_client import StatsdClient
 from vcsserver.tweens.request_wrapper import get_call_context, get_headers_call_context
 
 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.lib.exc_tracking import store_exception, format_exc
 from vcsserver.server import VcsServer
 
 strict_vcs = True
 
 git_import_err = None
 try:
     from vcsserver.remote.git import GitFactory, GitRemote
 except ImportError as e:
     GitFactory = None
     GitRemote = None
     git_import_err = e
     if strict_vcs:
         raise
 
 
 hg_import_err = None
 try:
     from vcsserver.remote.hg import MercurialFactory, HgRemote
 except ImportError as e:
     MercurialFactory = None
     HgRemote = None
     hg_import_err = e
     if strict_vcs:
         raise
 
 
 svn_import_err = None
 try:
     from vcsserver.remote.svn import SubversionFactory, SvnRemote
 except ImportError as e:
     SubversionFactory = None
     SvnRemote = None
     svn_import_err = e
     if strict_vcs:
         raise
 
 
 def _is_request_chunked(environ):
     stream = environ.get('HTTP_TRANSFER_ENCODING', '') == 'chunked'
     return stream
 
 
 def log_max_fd():
     try:
         maxfd = psutil.Process().rlimit(psutil.RLIMIT_NOFILE)[1]
         log.info('Max file descriptors value: %s', maxfd)
     except Exception:
         pass
 
 
 class VCS(object):
     def __init__(self, locale_conf=None, cache_config=None):
         self.locale = locale_conf
         self.cache_config = cache_config
         self._configure_locale()
 
         log_max_fd()
 
         if GitFactory and GitRemote:
             git_factory = GitFactory()
             self._git_remote = GitRemote(git_factory)
         else:
             log.error("Git client import failed: %s", git_import_err)
 
         if MercurialFactory and HgRemote:
             hg_factory = MercurialFactory()
             self._hg_remote = HgRemote(hg_factory)
         else:
             log.error("Mercurial client import failed: %s", hg_import_err)
 
         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.error("Subversion client import failed: %s", svn_import_err)
 
         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 f'vcs view method = {list(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.config = Configurator(settings=settings)
         # Init our statsd at very start
         self.config.registry.statsd = StatsdClient.statsd
         self.config.registry.vcs_call_context = {}
 
         self.global_config = global_config
         self.config.include('vcsserver.lib.rc_cache')
         self.config.include('vcsserver.lib.rc_cache.archive_cache')
 
         settings_locale = settings.get('locale', '') or 'en_US.UTF-8'
         vcs = VCS(locale_conf=settings_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 _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')
 
         # rpc methods
         self.config.add_route('vcs', '/{backend}')
 
         # streaming rpc remote methods
         self.config.add_route('vcs_stream', '/{backend}/stream')
 
         # vcs operations clone/push as streaming
         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.vcs_stream_view, route_name='vcs_stream',
                              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.request_wrapper.RequestWrapperTween',
         )
         self.config.add_request_method(
             'vcsserver.lib.request_counter.get_request_counter',
             'request_count')
 
     def wsgi_app(self):
         return self.config.make_wsgi_app()
 
     def _vcs_view_params(self, request):
         remote = self._remotes[request.matchdict['backend']]
         payload = msgpack.unpackb(request.body, use_list=True)
 
         method = payload.get('method')
         params = payload['params']
         wire = params.get('wire')
         args = params.get('args')
         kwargs = params.get('kwargs')
         context_uid = None
 
         request.registry.vcs_call_context = {
             'method': method,
             'repo_name': payload.get('_repo_name'),
         }
 
         if wire:
             try:
                 wire['context'] = context_uid = uuid.UUID(wire['context'])
             except KeyError:
                 pass
             args.insert(0, wire)
         repo_state_uid = wire.get('repo_state_uid') if wire else None
 
         # NOTE(marcink): trading complexity for slight performance
         if log.isEnabledFor(logging.DEBUG):
             # also we SKIP printing out any of those methods args since they maybe excessive
             just_args_methods = {
                 'commitctx': ('content', 'removed', 'updated'),
                 'commit': ('content', 'removed', 'updated')
             }
             if method in just_args_methods:
                 skip_args = just_args_methods[method]
                 call_args = ''
                 call_kwargs = {}
                 for k in kwargs:
                     if k in skip_args:
                         # replace our skip key with dummy
                         call_kwargs[k] = f'RemovedParam({k})'
                     else:
                         call_kwargs[k] = kwargs[k]
             else:
                 call_args = args[1:]
                 call_kwargs = kwargs
 
             log.debug('Method requested:`%s` with args:%s kwargs:%s context_uid: %s, repo_state_uid:%s',
                       method, call_args, call_kwargs, context_uid, repo_state_uid)
 
         statsd = request.registry.statsd
         if statsd:
             statsd.incr(
                 'vcsserver_method_total', tags=[
                     f"method:{method}",
                 ])
         return payload, remote, method, args, kwargs
 
     def vcs_view(self, request):
 
         payload, remote, method, args, kwargs = self._vcs_view_params(request)
         payload_id = payload.get('id')
 
         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
 
             should_store_exc = True
             if org_exc:
                 def get_exc_fqn(_exc_obj):
                     module_name = getattr(org_exc.__class__, '__module__', 'UNKNOWN')
                     return module_name + '.' + org_exc_name
 
                 exc_fqn = get_exc_fqn(org_exc)
 
                 if exc_fqn in ['mercurial.error.RepoLookupError',
                                'vcsserver.exceptions.RefNotFoundException']:
                     should_store_exc = False
 
             if should_store_exc:
                 store_exception(id(exc_info), exc_info, request_path=request.path)
 
-            tb_info = ''.join(
-                traceback.format_exception(exc_type, exc_value, exc_traceback))
+            tb_info = format_exc(exc_info)
 
             type_ = e.__class__.__name__
             if type_ not in self.ALLOWED_EXCEPTIONS:
                 type_ = None
 
             resp = {
                 'id': payload_id,
                 'error': {
                     'message': str(e),
                     '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_id,
                 'result': resp
             }
         log.debug('Serving data for method %s', method)
         return resp
 
     def vcs_stream_view(self, request):
         payload, remote, method, args, kwargs = self._vcs_view_params(request)
         # this method has a stream: marker we remove it here
         method = method.split('stream:')[-1]
         chunk_size = safe_int(payload.get('chunk_size')) or 4096
 
         try:
             resp = getattr(remote, method)(*args, **kwargs)
         except Exception as e:
             raise
 
         def get_chunked_data(method_resp):
             stream = io.BytesIO(method_resp)
             while 1:
                 chunk = stream.read(chunk_size)
                 if not chunk:
                     break
                 yield chunk
 
         response = Response(app_iter=get_chunked_data(resp))
         response.content_type = 'application/octet-stream'
 
         return response
 
     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)
         server_config, app_config = {}, {}
 
         try:
             path = self.global_config['__file__']
             config = configparser.RawConfigParser()
 
             config.read(path)
 
             if config.has_section('server:main'):
                 server_config = dict(config.items('server:main'))
             if config.has_section('app:main'):
                 app_config = dict(config.items('app:main'))
 
         except Exception:
             log.exception('Failed to read .ini file for display')
 
         environ = list(os.environ.items())
 
         resp = {
             'id': payload.get('id'),
             'result': dict(
                 version=vcsserver.__version__,
                 config=server_config,
                 app_config=app_config,
                 environ=environ,
                 payload=payload,
             )
         }
         return resp
 
     def _msgpack_renderer_factory(self, info):
 
         def _render(value, system):
             bin_type = False
             res = value.get('result')
             if isinstance(res, BytesEnvelope):
                 log.debug('Result is wrapped in BytesEnvelope type')
                 bin_type = True
             elif isinstance(res, BinaryEnvelope):
                 log.debug('Result is wrapped in BinaryEnvelope type')
                 value['result'] = res.val
                 bin_type = True
 
             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'
                     if bin_type:
                         response.content_type = 'application/x-msgpack-bin'
 
             return msgpack.packb(value, use_bin_type=bin_type)
         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')
                 call_context = get_headers_call_context(environ)
 
                 repo_path = call_context['repo_path']
                 repo_name = call_context['repo_name']
                 config = call_context['repo_config']
 
                 app = scm_app.create_hg_wsgi_app(
                     repo_path, repo_name, config)
 
                 # Consistent path information for hgweb
                 environ['PATH_INFO'] = call_context['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')
 
                 call_context = get_headers_call_context(environ)
 
                 repo_path = call_context['repo_path']
                 repo_name = call_context['repo_name']
                 config = call_context['repo_config']
 
                 environ['PATH_INFO'] = call_context['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':
             headers_call_context = get_headers_call_context(request.environ)
             status_code = safe_int(headers_call_context['locked_status_code'])
 
             return HTTPRepoLocked(
                 title=str(exception), status_code=status_code, headers=[('X-Rc-Locked', '1')])
 
         elif _vcs_kind == 'repo_branch_protected':
             # Get custom repo-branch-protected status code if present.
             return HTTPRepoBranchProtected(
                 title=str(exception), headers=[('X-Rc-Branch-Protection', '1')])
 
         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))
+            traceback_info = format_exc(request.exc_info)
 
         log.error(
-            'error occurred handling this request for path: %s, \n tb: %s',
+            'error occurred handling this request for path: %s, \n%s',
             request.path, traceback_info)
 
         statsd = request.registry.statsd
         if statsd:
             exc_type = f"{exception.__class__.__module__}.{exception.__class__.__name__}"
             statsd.incr('vcsserver_exception_total',
                         tags=[f"type:{exc_type}"])
         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 sanitize_settings_and_apply_defaults(global_config, settings):
     global_settings_maker = SettingsMaker(global_config)
     settings_maker = SettingsMaker(settings)
 
     settings_maker.make_setting('logging.autoconfigure', False, parser='bool')
 
     logging_conf = os.path.join(os.path.dirname(global_config.get('__file__')), 'logging.ini')
     settings_maker.enable_logging(logging_conf)
 
     # Default includes, possible to change as a user
     pyramid_includes = settings_maker.make_setting('pyramid.includes', [], parser='list:newline')
     log.debug("Using the following pyramid.includes: %s", pyramid_includes)
 
     settings_maker.make_setting('__file__', global_config.get('__file__'))
 
     settings_maker.make_setting('pyramid.default_locale_name', 'en')
     settings_maker.make_setting('locale', 'en_US.UTF-8')
 
     settings_maker.make_setting('core.binary_dir', '')
 
     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 = settings_maker.make_setting(
         'cache_dir',
         default=default_cache_dir, default_when_empty=True,
         parser='dir:ensured')
 
     # exception store cache
     settings_maker.make_setting(
         'exception_tracker.store_path',
         default=os.path.join(default_cache_dir, 'exc_store'), default_when_empty=True,
         parser='dir:ensured'
     )
 
     # repo_object cache defaults
     settings_maker.make_setting(
         'rc_cache.repo_object.backend',
         default='dogpile.cache.rc.file_namespace',
         parser='string')
     settings_maker.make_setting(
         'rc_cache.repo_object.expiration_time',
         default=30 * 24 * 60 * 60,  # 30days
         parser='int')
     settings_maker.make_setting(
         'rc_cache.repo_object.arguments.filename',
         default=os.path.join(default_cache_dir, 'vcsserver_cache_repo_object.db'),
         parser='string')
 
     # statsd
     settings_maker.make_setting('statsd.enabled', False, parser='bool')
     settings_maker.make_setting('statsd.statsd_host', 'statsd-exporter', parser='string')
     settings_maker.make_setting('statsd.statsd_port', 9125, parser='int')
     settings_maker.make_setting('statsd.statsd_prefix', '')
     settings_maker.make_setting('statsd.statsd_ipv6', False, parser='bool')
 
     settings_maker.env_expand()
 
 
 def main(global_config, **settings):
     start_time = time.time()
     log.info('Pyramid app config starting')
 
     if MercurialFactory:
         hgpatches.patch_largefiles_capabilities()
         hgpatches.patch_subrepo_type_mapping()
 
     # Fill in and sanitize the defaults & do ENV expansion
     sanitize_settings_and_apply_defaults(global_config, settings)
 
     # init and bootstrap StatsdClient
     StatsdClient.setup(settings)
 
     pyramid_app = HTTPApplication(settings=settings, global_config=global_config).wsgi_app()
     total_time = time.time() - start_time
     log.info('Pyramid app created and configured in %.2fs', total_time)
     return pyramid_app
 
 

vcsserver/lib/exc_tracking.py

@@ -1,172 +1,267 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2023 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 time
+import sys
 import datetime
 import msgpack
 import logging
 import traceback
 import tempfile
+import glob
 
 log = logging.getLogger(__name__)
 
 # NOTE: Any changes should be synced with exc_tracking at rhodecode.lib.exc_tracking
 global_prefix = 'vcsserver'
 exc_store_dir_name = 'rc_exception_store_v1'
 
 
-def exc_serialize(exc_id, tb, exc_type):
+def exc_serialize(exc_id, tb, exc_type, extra_data=None):
 
     data = {
         'version': 'v1',
         'exc_id': exc_id,
         'exc_utc_date': datetime.datetime.utcnow().isoformat(),
         'exc_timestamp': repr(time.time()),
         'exc_message': tb,
         'exc_type': exc_type,
     }
+    if extra_data:
+        data.update(extra_data)
     return msgpack.packb(data), data
 
 
 def exc_unserialize(tb):
     return msgpack.unpackb(tb)
 
 
+_exc_store = None
+
+
 def get_exc_store():
     """
     Get and create exception store if it's not existing
     """
+    global _exc_store
+
+    if _exc_store is not None:
+        # quick global cache
+        return _exc_store
+
     import vcsserver as app
 
     exc_store_dir = app.CONFIG.get('exception_tracker.store_path', '') or tempfile.gettempdir()
     _exc_store_path = os.path.join(exc_store_dir, exc_store_dir_name)
 
     _exc_store_path = os.path.abspath(_exc_store_path)
     if not os.path.isdir(_exc_store_path):
         os.makedirs(_exc_store_path)
         log.debug('Initializing exceptions store at %s', _exc_store_path)
+        _exc_store = _exc_store_path
+
     return _exc_store_path
 
 
-def _store_exception(exc_id, exc_info, prefix, request_path=''):
-    exc_type, exc_value, exc_traceback = exc_info
+def get_detailed_tb(exc_info):
+    from io import StringIO
+
+    try:
+        from pip._vendor.rich import traceback as rich_tb, scope as rich_scope, console as rich_console
+    except ImportError:
+        try:
+            from rich import traceback as rich_tb, scope as rich_scope, console as rich_console
+        except ImportError:
+            return None
+
+    console = rich_console.Console(
+        width=160,
+        file=StringIO()
+    )
+
+    exc = rich_tb.Traceback.extract(*exc_info, show_locals=True)
+
+    tb_rich = rich_tb.Traceback(
+        trace=exc,
+        width=160,
+        extra_lines=3,
+        theme=None,
+        word_wrap=False,
+        show_locals=False,
+        max_frames=100
+    )
+
+    formatted_locals = ""
 
-    tb = ''.join(traceback.format_exception(
-        exc_type, exc_value, exc_traceback, None))
+    # last_stack = exc.stacks[-1]
+    # last_frame = last_stack.frames[-1]
+    # if last_frame and last_frame.locals:
+    #     console.print(
+    #         rich_scope.render_scope(
+    #             last_frame.locals,
+    #             title=f'{last_frame.filename}:{last_frame.lineno}'))
+
+    console.print(tb_rich)
+    formatted_locals = console.file.getvalue()
+
+    return formatted_locals
+
 
-    detailed_tb = getattr(exc_value, '_org_exc_tb', None)
+def get_request_metadata(request=None) -> dict:
+    request_metadata = {}
+    if not request:
+        from pyramid.threadlocal import get_current_request
+        request = get_current_request()
 
+    # NOTE(marcink): store request information into exc_data
+    if request:
+        request_metadata['client_address'] = getattr(request, 'client_addr', '')
+        request_metadata['user_agent'] = getattr(request, 'user_agent', '')
+        request_metadata['method'] = getattr(request, 'method', '')
+        request_metadata['url'] = getattr(request, 'url', '')
+    return request_metadata
+
+
+def format_exc(exc_info):
+    exc_type, exc_value, exc_traceback = exc_info
+    tb = "++ TRACEBACK ++\n\n"
+    tb += "".join(traceback.format_exception(exc_type, exc_value, exc_traceback, None))
+    
+    detailed_tb = getattr(exc_value, "_org_exc_tb", None)
+    
     if detailed_tb:
         remote_tb = detailed_tb
         if isinstance(detailed_tb, str):
             remote_tb = [detailed_tb]
-
+    
         tb += (
-            '\n+++ BEG SOURCE EXCEPTION +++\n\n'
-            '{}\n'
-            '+++ END SOURCE EXCEPTION +++\n'
-            ''.format('\n'.join(remote_tb))
+            "\n+++ BEG SOURCE EXCEPTION +++\n\n"
+            "{}\n"
+            "+++ END SOURCE EXCEPTION +++\n"
+            "".format("\n".join(remote_tb))
         )
-
+    
         # Avoid that remote_tb also appears in the frame
         del remote_tb
+    
+    locals_tb = get_detailed_tb(exc_info)
+    if locals_tb:
+        tb += f"\n+++ DETAILS +++\n\n{locals_tb}\n" ""
+    return tb
+
+
+def _store_exception(exc_id, exc_info, prefix, request_path=''):
+    """
+    Low level function to store exception in the exception tracker
+    """
+
+    extra_data = {}
+    extra_data.update(get_request_metadata())
+
+    exc_type, exc_value, exc_traceback = exc_info
+    tb = format_exc(exc_info)
 
     exc_type_name = exc_type.__name__
+    exc_data, org_data = exc_serialize(exc_id, tb, exc_type_name, extra_data=extra_data)
+
+    exc_pref_id = '{}_{}_{}'.format(exc_id, prefix, org_data['exc_timestamp'])
     exc_store_path = get_exc_store()
-    exc_data, org_data = exc_serialize(exc_id, tb, exc_type_name)
-    exc_pref_id = '{}_{}_{}'.format(exc_id, prefix, org_data['exc_timestamp'])
     if not os.path.isdir(exc_store_path):
         os.makedirs(exc_store_path)
     stored_exc_path = os.path.join(exc_store_path, exc_pref_id)
     with open(stored_exc_path, 'wb') as f:
         f.write(exc_data)
     log.debug('Stored generated exception %s as: %s', exc_id, stored_exc_path)
 
     log.error(
         'error occurred handling this request.\n'
-        'Path: `%s`, tb: %s',
+        'Path: `%s`, %s',
         request_path, tb)
 
 
 def store_exception(exc_id, exc_info, prefix=global_prefix, request_path=''):
     """
     Example usage::
 
         exc_info = sys.exc_info()
         store_exception(id(exc_info), exc_info)
     """
 
     try:
+        exc_type = exc_info[0]
+        exc_type_name = exc_type.__name__
+
         _store_exception(exc_id=exc_id, exc_info=exc_info, prefix=prefix,
                          request_path=request_path)
+        return exc_id, exc_type_name
     except Exception:
         log.exception('Failed to store exception `%s` information', exc_id)
         # there's no way this can fail, it will crash server badly if it does.
         pass
 
 
 def _find_exc_file(exc_id, prefix=global_prefix):
     exc_store_path = get_exc_store()
     if prefix:
         exc_id = f'{exc_id}_{prefix}'
     else:
         # search without a prefix
         exc_id = f'{exc_id}'
 
-    # we need to search the store for such start pattern as above
-    for fname in os.listdir(exc_store_path):
-        if fname.startswith(exc_id):
-            exc_id = os.path.join(exc_store_path, fname)
-            break
-        continue
-    else:
-        exc_id = None
+    found_exc_id = None
+    matches = glob.glob(os.path.join(exc_store_path, exc_id) + '*')
+    if matches:
+        found_exc_id = matches[0]
 
-    return exc_id
+    return found_exc_id
 
 
 def _read_exception(exc_id, prefix):
     exc_id_file_path = _find_exc_file(exc_id=exc_id, prefix=prefix)
     if exc_id_file_path:
         with open(exc_id_file_path, 'rb') as f:
             return exc_unserialize(f.read())
     else:
         log.debug('Exception File `%s` not found', exc_id_file_path)
     return None
 
 
 def read_exception(exc_id, prefix=global_prefix):
     try:
         return _read_exception(exc_id=exc_id, prefix=prefix)
     except Exception:
         log.exception('Failed to read exception `%s` information', exc_id)
         # there's no way this can fail, it will crash server badly if it does.
     return None
 
 
 def delete_exception(exc_id, prefix=global_prefix):
     try:
         exc_id_file_path = _find_exc_file(exc_id, prefix=prefix)
         if exc_id_file_path:
             os.remove(exc_id_file_path)
 
     except Exception:
         log.exception('Failed to remove exception `%s` information', exc_id)
         # there's no way this can fail, it will crash server badly if it does.
         pass
+
+
+def generate_id():
+    return id(object())

vcsserver/remote/hg.py

@@ -1,1164 +1,1199 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2023 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 binascii
 import io
 import logging
 import stat
+import sys
 import urllib.request
 import urllib.parse
-import traceback
 import hashlib
 
 from hgext import largefiles, rebase, purge
 
 from mercurial import commands
 from mercurial import unionrepo
 from mercurial import verify
 from mercurial import repair
 from mercurial.error import AmbiguousPrefixLookupError
 
 import vcsserver
 from vcsserver import exceptions
-from vcsserver.base import RepoFactory, obfuscate_qs, raise_from_original, store_archive_in_cache, ArchiveNode, BytesEnvelope, \
-    BinaryEnvelope
+from vcsserver.base import (
+    RepoFactory,
+    obfuscate_qs,
+    raise_from_original,
+    store_archive_in_cache,
+    ArchiveNode,
+    BytesEnvelope,
+    BinaryEnvelope,
+)
 from vcsserver.hgcompat import (
-    archival, bin, clone, config as hgconfig, diffopts, hex, get_ctx,
-    hg_url as url_parser, httpbasicauthhandler, httpdigestauthhandler,
-    makepeer, instance, match, memctx, exchange, memfilectx, nullrev, hg_merge,
-    patch, peer, revrange, ui, hg_tag, Abort, LookupError, RepoError,
-    RepoLookupError, InterventionRequired, RequirementError,
-    alwaysmatcher, patternmatcher, hgutil, hgext_strip)
+    archival,
+    bin,
+    clone,
+    config as hgconfig,
+    diffopts,
+    hex,
+    get_ctx,
+    hg_url as url_parser,
+    httpbasicauthhandler,
+    httpdigestauthhandler,
+    makepeer,
+    instance,
+    match,
+    memctx,
+    exchange,
+    memfilectx,
+    nullrev,
+    hg_merge,
+    patch,
+    peer,
+    revrange,
+    ui,
+    hg_tag,
+    Abort,
+    LookupError,
+    RepoError,
+    RepoLookupError,
+    InterventionRequired,
+    RequirementError,
+    alwaysmatcher,
+    patternmatcher,
+    hgutil,
+    hgext_strip,
+)
 from vcsserver.str_utils import ascii_bytes, ascii_str, safe_str, safe_bytes
 from vcsserver.vcs_base import RemoteBase
 from vcsserver.config import hooks as hooks_config
-
+from vcsserver.lib.exc_tracking import format_exc
 
 log = logging.getLogger(__name__)
 
 
 def make_ui_from_config(repo_config):
 
     class LoggingUI(ui.ui):
 
         def status(self, *msg, **opts):
             str_msg = map(safe_str, msg)
             log.info(' '.join(str_msg).rstrip('\n'))
             #super(LoggingUI, self).status(*msg, **opts)
 
         def warn(self, *msg, **opts):
             str_msg = map(safe_str, msg)
             log.warning('ui_logger:'+' '.join(str_msg).rstrip('\n'))
             #super(LoggingUI, self).warn(*msg, **opts)
 
         def error(self, *msg, **opts):
             str_msg = map(safe_str, msg)
             log.error('ui_logger:'+' '.join(str_msg).rstrip('\n'))
             #super(LoggingUI, self).error(*msg, **opts)
 
         def note(self, *msg, **opts):
             str_msg = map(safe_str, msg)
             log.info('ui_logger:'+' '.join(str_msg).rstrip('\n'))
             #super(LoggingUI, self).note(*msg, **opts)
 
         def debug(self, *msg, **opts):
             str_msg = map(safe_str, msg)
             log.debug('ui_logger:'+' '.join(str_msg).rstrip('\n'))
             #super(LoggingUI, self).debug(*msg, **opts)
 
     baseui = LoggingUI()
 
     # clean the baseui object
     baseui._ocfg = hgconfig.config()
     baseui._ucfg = hgconfig.config()
     baseui._tcfg = hgconfig.config()
 
     for section, option, value in repo_config:
         baseui.setconfig(ascii_bytes(section), ascii_bytes(option), ascii_bytes(value))
 
     # make our hgweb quiet so it doesn't print output
     baseui.setconfig(b'ui', b'quiet', b'true')
 
     baseui.setconfig(b'ui', b'paginate', b'never')
     # for better Error reporting of Mercurial
     baseui.setconfig(b'ui', b'message-output', b'stderr')
 
     # force mercurial to only use 1 thread, otherwise it may try to set a
     # signal in a non-main thread, thus generating a ValueError.
     baseui.setconfig(b'worker', b'numcpus', 1)
 
     # If there is no config for the largefiles extension, we explicitly disable
     # it here. This overrides settings from repositories hgrc file. Recent
     # mercurial versions enable largefiles in hgrc on clone from largefile
     # repo.
     if not baseui.hasconfig(b'extensions', b'largefiles'):
         log.debug('Explicitly disable largefiles extension for repo.')
         baseui.setconfig(b'extensions', b'largefiles', b'!')
 
     return baseui
 
 
 def reraise_safe_exceptions(func):
     """Decorator for converting mercurial exceptions to something neutral."""
 
     def wrapper(*args, **kwargs):
         try:
             return func(*args, **kwargs)
         except (Abort, InterventionRequired) as e:
             raise_from_original(exceptions.AbortException(e), e)
         except RepoLookupError as e:
             raise_from_original(exceptions.LookupException(e), e)
         except RequirementError as e:
             raise_from_original(exceptions.RequirementException(e), e)
         except RepoError as e:
             raise_from_original(exceptions.VcsException(e), e)
         except LookupError as e:
             raise_from_original(exceptions.LookupException(e), e)
         except Exception as e:
             if not hasattr(e, '_vcs_kind'):
                 log.exception("Unhandled exception in hg remote call")
                 raise_from_original(exceptions.UnhandledException(e), e)
 
             raise
     return wrapper
 
 
 class MercurialFactory(RepoFactory):
     repo_type = 'hg'
 
     def _create_config(self, config, hooks=True):
         if not hooks:
 
             hooks_to_clean = {
 
                 hooks_config.HOOK_REPO_SIZE,
                 hooks_config.HOOK_PRE_PULL,
                 hooks_config.HOOK_PULL,
 
                 hooks_config.HOOK_PRE_PUSH,
                 # TODO: what about PRETXT, this was disabled in pre 5.0.0
                 hooks_config.HOOK_PRETX_PUSH,
 
             }
             new_config = []
             for section, option, value in config:
                 if section == 'hooks' and option in hooks_to_clean:
                     continue
                 new_config.append((section, option, value))
             config = new_config
 
         baseui = make_ui_from_config(config)
         return baseui
 
     def _create_repo(self, wire, create):
         baseui = self._create_config(wire["config"])
         repo = instance(baseui, safe_bytes(wire["path"]), create)
         log.debug('repository created: got HG object: %s', repo)
         return repo
 
     def repo(self, wire, create=False):
         """
         Get a repository instance for the given path.
         """
         return self._create_repo(wire, create)
 
 
 def patch_ui_message_output(baseui):
     baseui.setconfig(b'ui', b'quiet', b'false')
     output = io.BytesIO()
 
     def write(data, **unused_kwargs):
         output.write(data)
 
     baseui.status = write
     baseui.write = write
     baseui.warn = write
     baseui.debug = write
 
     return baseui, output
 
 
 def get_obfuscated_url(url_obj):
     url_obj.passwd = b'*****' if url_obj.passwd else url_obj.passwd
     url_obj.query = obfuscate_qs(url_obj.query)
     obfuscated_uri = str(url_obj)
     return obfuscated_uri
 
 
 def normalize_url_for_hg(url: str):
     _proto = None
 
     if '+' in url[:url.find('://')]:
         _proto = url[0:url.find('+')]
         url = url[url.find('+') + 1:]
     return url, _proto
 
 
 class HgRemote(RemoteBase):
 
     def __init__(self, factory):
         self._factory = factory
         self._bulk_methods = {
             "affected_files": self.ctx_files,
             "author": self.ctx_user,
             "branch": self.ctx_branch,
             "children": self.ctx_children,
             "date": self.ctx_date,
             "message": self.ctx_description,
             "parents": self.ctx_parents,
             "status": self.ctx_status,
             "obsolete": self.ctx_obsolete,
             "phase": self.ctx_phase,
             "hidden": self.ctx_hidden,
             "_file_paths": self.ctx_list,
         }
         self._bulk_file_methods = {
             "size": self.fctx_size,
             "data": self.fctx_node_data,
             "flags": self.fctx_flags,
             "is_binary": self.is_binary,
             "md5": self.md5_hash,
         }
 
     def _get_ctx(self, repo, ref):
         return get_ctx(repo, ref)
 
     @reraise_safe_exceptions
     def discover_hg_version(self):
         from mercurial import util
         return safe_str(util.version())
 
     @reraise_safe_exceptions
     def is_empty(self, wire):
         repo = self._factory.repo(wire)
 
         try:
             return len(repo) == 0
         except Exception:
             log.exception("failed to read object_store")
             return False
 
     @reraise_safe_exceptions
     def bookmarks(self, wire):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _bookmarks(_context_uid, _repo_id):
             repo = self._factory.repo(wire)
             return {safe_str(name): ascii_str(hex(sha)) for name, sha in repo._bookmarks.items()}
 
         return _bookmarks(context_uid, repo_id)
 
     @reraise_safe_exceptions
     def branches(self, wire, normal, closed):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _branches(_context_uid, _repo_id, _normal, _closed):
             repo = self._factory.repo(wire)
             iter_branches = repo.branchmap().iterbranches()
             bt = {}
             for branch_name, _heads, tip_node, is_closed in iter_branches:
                 if normal and not is_closed:
                     bt[safe_str(branch_name)] = ascii_str(hex(tip_node))
                 if closed and is_closed:
                     bt[safe_str(branch_name)] = ascii_str(hex(tip_node))
 
             return bt
 
         return _branches(context_uid, repo_id, normal, closed)
 
     @reraise_safe_exceptions
     def bulk_request(self, wire, commit_id, pre_load):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _bulk_request(_repo_id, _commit_id, _pre_load):
             result = {}
             for attr in pre_load:
                 try:
                     method = self._bulk_methods[attr]
                     wire.update({'cache': False})  # disable cache for bulk calls so we don't double cache
                     result[attr] = method(wire, commit_id)
                 except KeyError as e:
                     raise exceptions.VcsException(e)(
                         'Unknown bulk attribute: "%s"' % attr)
             return result
 
         return _bulk_request(repo_id, commit_id, sorted(pre_load))
 
     @reraise_safe_exceptions
     def ctx_branch(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_branch(_repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             return ctx.branch()
         return _ctx_branch(repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_date(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_date(_repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             return ctx.date()
         return _ctx_date(repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_description(self, wire, revision):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         return ctx.description()
 
     @reraise_safe_exceptions
     def ctx_files(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_files(_repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             return ctx.files()
 
         return _ctx_files(repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_list(self, path, revision):
         repo = self._factory.repo(path)
         ctx = self._get_ctx(repo, revision)
         return list(ctx)
 
     @reraise_safe_exceptions
     def ctx_parents(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_parents(_repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             return [parent.hex() for parent in ctx.parents()
                     if not (parent.hidden() or parent.obsolete())]
 
         return _ctx_parents(repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_children(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_children(_repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             return [child.hex() for child in ctx.children()
                     if not (child.hidden() or child.obsolete())]
 
         return _ctx_children(repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_phase(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_phase(_context_uid, _repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             # public=0, draft=1, secret=3
             return ctx.phase()
         return _ctx_phase(context_uid, repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_obsolete(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_obsolete(_context_uid, _repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             return ctx.obsolete()
         return _ctx_obsolete(context_uid, repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_hidden(self, wire, commit_id):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _ctx_hidden(_context_uid, _repo_id, _commit_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             return ctx.hidden()
         return _ctx_hidden(context_uid, repo_id, commit_id)
 
     @reraise_safe_exceptions
     def ctx_substate(self, wire, revision):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         return ctx.substate
 
     @reraise_safe_exceptions
     def ctx_status(self, wire, revision):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         status = repo[ctx.p1().node()].status(other=ctx.node())
         # object of status (odd, custom named tuple in mercurial) is not
         # correctly serializable, we make it a list, as the underling
         # API expects this to be a list
         return list(status)
 
     @reraise_safe_exceptions
     def ctx_user(self, wire, revision):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         return ctx.user()
 
     @reraise_safe_exceptions
     def check_url(self, url, config):
         url, _proto = normalize_url_for_hg(url)
         url_obj = url_parser(safe_bytes(url))
 
         test_uri = safe_str(url_obj.authinfo()[0])
         authinfo = url_obj.authinfo()[1]
         obfuscated_uri = get_obfuscated_url(url_obj)
         log.info("Checking URL for remote cloning/import: %s", obfuscated_uri)
 
         handlers = []
         if authinfo:
             # create a password manager
             passmgr = urllib.request.HTTPPasswordMgrWithDefaultRealm()
             passmgr.add_password(*authinfo)
 
             handlers.extend((httpbasicauthhandler(passmgr),
                              httpdigestauthhandler(passmgr)))
 
         o = urllib.request.build_opener(*handlers)
         o.addheaders = [('Content-Type', 'application/mercurial-0.1'),
                         ('Accept', 'application/mercurial-0.1')]
 
         q = {"cmd": 'between'}
         q.update({'pairs': "{}-{}".format('0' * 40, '0' * 40)})
         qs = '?%s' % urllib.parse.urlencode(q)
         cu = f"{test_uri}{qs}"
         req = urllib.request.Request(cu, None, {})
 
         try:
             log.debug("Trying to open URL %s", obfuscated_uri)
             resp = o.open(req)
             if resp.code != 200:
                 raise exceptions.URLError()('Return Code is not 200')
         except Exception as e:
             log.warning("URL cannot be opened: %s", obfuscated_uri, exc_info=True)
             # means it cannot be cloned
             raise exceptions.URLError(e)(f"[{obfuscated_uri}] org_exc: {e}")
 
         # now check if it's a proper hg repo, but don't do it for svn
         try:
             if _proto == 'svn':
                 pass
             else:
                 # check for pure hg repos
                 log.debug(
                     "Verifying if URL is a Mercurial repository: %s", obfuscated_uri)
                 ui = make_ui_from_config(config)
                 peer_checker = makepeer(ui, safe_bytes(url))
                 peer_checker.lookup(b'tip')
         except Exception as e:
             log.warning("URL is not a valid Mercurial repository: %s",
                         obfuscated_uri)
             raise exceptions.URLError(e)(
                 "url [%s] does not look like an hg repo org_exc: %s"
                 % (obfuscated_uri, e))
 
         log.info("URL is a valid Mercurial repository: %s", obfuscated_uri)
         return True
 
     @reraise_safe_exceptions
     def diff(self, wire, commit_id_1, commit_id_2, file_filter, opt_git, opt_ignorews, context):
         repo = self._factory.repo(wire)
 
         if file_filter:
             # unpack the file-filter
             repo_path, node_path = file_filter
             match_filter = match(safe_bytes(repo_path), b'', [safe_bytes(node_path)])
         else:
             match_filter = file_filter
         opts = diffopts(git=opt_git, ignorews=opt_ignorews, context=context, showfunc=1)
 
         try:
             diff_iter = patch.diff(
                 repo, node1=commit_id_1, node2=commit_id_2, match=match_filter, opts=opts)
             return BytesEnvelope(b"".join(diff_iter))
         except RepoLookupError as e:
             raise exceptions.LookupException(e)()
 
     @reraise_safe_exceptions
     def node_history(self, wire, revision, path, limit):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _node_history(_context_uid, _repo_id, _revision, _path, _limit):
             repo = self._factory.repo(wire)
 
             ctx = self._get_ctx(repo, revision)
             fctx = ctx.filectx(safe_bytes(path))
 
             def history_iter():
                 limit_rev = fctx.rev()
                 for obj in reversed(list(fctx.filelog())):
                     obj = fctx.filectx(obj)
                     ctx = obj.changectx()
                     if ctx.hidden() or ctx.obsolete():
                         continue
 
                     if limit_rev >= obj.rev():
                         yield obj
 
             history = []
             for cnt, obj in enumerate(history_iter()):
                 if limit and cnt >= limit:
                     break
                 history.append(hex(obj.node()))
 
             return [x for x in history]
         return _node_history(context_uid, repo_id, revision, path, limit)
 
     @reraise_safe_exceptions
     def node_history_untill(self, wire, revision, path, limit):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _node_history_until(_context_uid, _repo_id):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, revision)
             fctx = ctx.filectx(safe_bytes(path))
 
             file_log = list(fctx.filelog())
             if limit:
                 # Limit to the last n items
                 file_log = file_log[-limit:]
 
             return [hex(fctx.filectx(cs).node()) for cs in reversed(file_log)]
         return _node_history_until(context_uid, repo_id, revision, path, limit)
 
     @reraise_safe_exceptions
     def bulk_file_request(self, wire, commit_id, path, pre_load):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _bulk_file_request(_repo_id, _commit_id, _path, _pre_load):
             result = {}
             for attr in pre_load:
                 try:
                     method = self._bulk_file_methods[attr]
                     wire.update({'cache': False})  # disable cache for bulk calls so we don't double cache
                     result[attr] = method(wire, _commit_id, _path)
                 except KeyError as e:
                     raise exceptions.VcsException(e)(f'Unknown bulk attribute: "{attr}"')
             return result
 
         return BinaryEnvelope(_bulk_file_request(repo_id, commit_id, path, sorted(pre_load)))
 
     @reraise_safe_exceptions
     def fctx_annotate(self, wire, revision, path):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         fctx = ctx.filectx(safe_bytes(path))
 
         result = []
         for i, annotate_obj in enumerate(fctx.annotate(), 1):
             ln_no = i
             sha = hex(annotate_obj.fctx.node())
             content = annotate_obj.text
             result.append((ln_no, ascii_str(sha), content))
         return BinaryEnvelope(result)
 
     @reraise_safe_exceptions
     def fctx_node_data(self, wire, revision, path):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         fctx = ctx.filectx(safe_bytes(path))
         return BytesEnvelope(fctx.data())
 
     @reraise_safe_exceptions
     def fctx_flags(self, wire, commit_id, path):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _fctx_flags(_repo_id, _commit_id, _path):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             fctx = ctx.filectx(safe_bytes(path))
             return fctx.flags()
 
         return _fctx_flags(repo_id, commit_id, path)
 
     @reraise_safe_exceptions
     def fctx_size(self, wire, commit_id, path):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _fctx_size(_repo_id, _revision, _path):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, commit_id)
             fctx = ctx.filectx(safe_bytes(path))
             return fctx.size()
         return _fctx_size(repo_id, commit_id, path)
 
     @reraise_safe_exceptions
     def get_all_commit_ids(self, wire, name):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _get_all_commit_ids(_context_uid, _repo_id, _name):
             repo = self._factory.repo(wire)
             revs = [ascii_str(repo[x].hex()) for x in repo.filtered(b'visible').changelog.revs()]
             return revs
         return _get_all_commit_ids(context_uid, repo_id, name)
 
     @reraise_safe_exceptions
     def get_config_value(self, wire, section, name, untrusted=False):
         repo = self._factory.repo(wire)
         return repo.ui.config(ascii_bytes(section), ascii_bytes(name), untrusted=untrusted)
 
     @reraise_safe_exceptions
     def is_large_file(self, wire, commit_id, path):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _is_large_file(_context_uid, _repo_id, _commit_id, _path):
             return largefiles.lfutil.isstandin(safe_bytes(path))
 
         return _is_large_file(context_uid, repo_id, commit_id, path)
 
     @reraise_safe_exceptions
     def is_binary(self, wire, revision, path):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _is_binary(_repo_id, _sha, _path):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, revision)
             fctx = ctx.filectx(safe_bytes(path))
             return fctx.isbinary()
 
         return _is_binary(repo_id, revision, path)
 
     @reraise_safe_exceptions
     def md5_hash(self, wire, revision, path):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _md5_hash(_repo_id, _sha, _path):
             repo = self._factory.repo(wire)
             ctx = self._get_ctx(repo, revision)
             fctx = ctx.filectx(safe_bytes(path))
             return hashlib.md5(fctx.data()).hexdigest()
 
         return _md5_hash(repo_id, revision, path)
 
     @reraise_safe_exceptions
     def in_largefiles_store(self, wire, sha):
         repo = self._factory.repo(wire)
         return largefiles.lfutil.instore(repo, sha)
 
     @reraise_safe_exceptions
     def in_user_cache(self, wire, sha):
         repo = self._factory.repo(wire)
         return largefiles.lfutil.inusercache(repo.ui, sha)
 
     @reraise_safe_exceptions
     def store_path(self, wire, sha):
         repo = self._factory.repo(wire)
         return largefiles.lfutil.storepath(repo, sha)
 
     @reraise_safe_exceptions
     def link(self, wire, sha, path):
         repo = self._factory.repo(wire)
         largefiles.lfutil.link(
             largefiles.lfutil.usercachepath(repo.ui, sha), path)
 
     @reraise_safe_exceptions
     def localrepository(self, wire, create=False):
         self._factory.repo(wire, create=create)
 
     @reraise_safe_exceptions
     def lookup(self, wire, revision, both):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _lookup(_context_uid, _repo_id, _revision, _both):
             repo = self._factory.repo(wire)
             rev = _revision
             if isinstance(rev, int):
                 # NOTE(marcink):
                 # since Mercurial doesn't support negative indexes properly
                 # we need to shift accordingly by one to get proper index, e.g
                 # repo[-1] => repo[-2]
                 # repo[0]  => repo[-1]
                 if rev <= 0:
                     rev = rev + -1
             try:
                 ctx = self._get_ctx(repo, rev)
-            except (AmbiguousPrefixLookupError) as e:
+            except AmbiguousPrefixLookupError:
                 e = RepoLookupError(rev)
-                e._org_exc_tb = traceback.format_exc()
+                e._org_exc_tb = format_exc(sys.exc_info())
                 raise exceptions.LookupException(e)(rev)
             except (TypeError, RepoLookupError, binascii.Error) as e:
-                e._org_exc_tb = traceback.format_exc()
+                e._org_exc_tb = format_exc(sys.exc_info())
                 raise exceptions.LookupException(e)(rev)
             except LookupError as e:
-                e._org_exc_tb = traceback.format_exc()
+                e._org_exc_tb = format_exc(sys.exc_info())
                 raise exceptions.LookupException(e)(e.name)
 
             if not both:
                 return ctx.hex()
 
             ctx = repo[ctx.hex()]
             return ctx.hex(), ctx.rev()
 
         return _lookup(context_uid, repo_id, revision, both)
 
     @reraise_safe_exceptions
     def sync_push(self, wire, url):
         if not self.check_url(url, wire['config']):
             return
 
         repo = self._factory.repo(wire)
 
         # Disable any prompts for this repo
         repo.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
 
         bookmarks = list(dict(repo._bookmarks).keys())
         remote = peer(repo, {}, safe_bytes(url))
         # Disable any prompts for this remote
         remote.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
 
         return exchange.push(
             repo, remote, newbranch=True, bookmarks=bookmarks).cgresult
 
     @reraise_safe_exceptions
     def revision(self, wire, rev):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, rev)
         return ctx.rev()
 
     @reraise_safe_exceptions
     def rev_range(self, wire, commit_filter):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _rev_range(_context_uid, _repo_id, _filter):
             repo = self._factory.repo(wire)
             revisions = [
                 ascii_str(repo[rev].hex())
                 for rev in revrange(repo, list(map(ascii_bytes, commit_filter)))
             ]
             return revisions
 
         return _rev_range(context_uid, repo_id, sorted(commit_filter))
 
     @reraise_safe_exceptions
     def rev_range_hash(self, wire, node):
         repo = self._factory.repo(wire)
 
         def get_revs(repo, rev_opt):
             if rev_opt:
                 revs = revrange(repo, rev_opt)
                 if len(revs) == 0:
                     return (nullrev, nullrev)
                 return max(revs), min(revs)
             else:
                 return len(repo) - 1, 0
 
         stop, start = get_revs(repo, [node + ':'])
         revs = [ascii_str(repo[r].hex()) for r in range(start, stop + 1)]
         return revs
 
     @reraise_safe_exceptions
     def revs_from_revspec(self, wire, rev_spec, *args, **kwargs):
         org_path = safe_bytes(wire["path"])
         other_path = safe_bytes(kwargs.pop('other_path', ''))
 
         # case when we want to compare two independent repositories
         if other_path and other_path != wire["path"]:
             baseui = self._factory._create_config(wire["config"])
             repo = unionrepo.makeunionrepository(baseui, other_path, org_path)
         else:
             repo = self._factory.repo(wire)
         return list(repo.revs(rev_spec, *args))
 
     @reraise_safe_exceptions
     def verify(self, wire,):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
 
         baseui, output = patch_ui_message_output(baseui)
 
         repo.ui = baseui
         verify.verify(repo)
         return output.getvalue()
 
     @reraise_safe_exceptions
     def hg_update_cache(self, wire,):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         baseui, output = patch_ui_message_output(baseui)
 
         repo.ui = baseui
         with repo.wlock(), repo.lock():
             repo.updatecaches(full=True)
 
         return output.getvalue()
 
     @reraise_safe_exceptions
     def hg_rebuild_fn_cache(self, wire,):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         baseui, output = patch_ui_message_output(baseui)
 
         repo.ui = baseui
 
         repair.rebuildfncache(baseui, repo)
 
         return output.getvalue()
 
     @reraise_safe_exceptions
     def tags(self, wire):
         cache_on, context_uid, repo_id = self._cache_on(wire)
         region = self._region(wire)
 
         @region.conditional_cache_on_arguments(condition=cache_on)
         def _tags(_context_uid, _repo_id):
             repo = self._factory.repo(wire)
             return {safe_str(name): ascii_str(hex(sha)) for name, sha in repo.tags().items()}
 
         return _tags(context_uid, repo_id)
 
     @reraise_safe_exceptions
     def update(self, wire, node='', clean=False):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         node = safe_bytes(node)
 
         commands.update(baseui, repo, node=node, clean=clean)
 
     @reraise_safe_exceptions
     def identify(self, wire):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         output = io.BytesIO()
         baseui.write = output.write
         # This is required to get a full node id
         baseui.debugflag = True
         commands.identify(baseui, repo, id=True)
 
         return output.getvalue()
 
     @reraise_safe_exceptions
     def heads(self, wire, branch=None):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         output = io.BytesIO()
 
         def write(data, **unused_kwargs):
             output.write(data)
 
         baseui.write = write
         if branch:
             args = [safe_bytes(branch)]
         else:
             args = []
         commands.heads(baseui, repo, template=b'{node} ', *args)
 
         return output.getvalue()
 
     @reraise_safe_exceptions
     def ancestor(self, wire, revision1, revision2):
         repo = self._factory.repo(wire)
         changelog = repo.changelog
         lookup = repo.lookup
         a = changelog.ancestor(lookup(safe_bytes(revision1)), lookup(safe_bytes(revision2)))
         return hex(a)
 
     @reraise_safe_exceptions
     def clone(self, wire, source, dest, update_after_clone=False, hooks=True):
         baseui = self._factory._create_config(wire["config"], hooks=hooks)
         clone(baseui, safe_bytes(source), safe_bytes(dest), noupdate=not update_after_clone)
 
     @reraise_safe_exceptions
     def commitctx(self, wire, message, parents, commit_time, commit_timezone, user, files, extra, removed, updated):
 
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         publishing = baseui.configbool(b'phases', b'publish')
 
         def _filectxfn(_repo, ctx, path: bytes):
             """
             Marks given path as added/changed/removed in a given _repo. This is
             for internal mercurial commit function.
             """
 
             # check if this path is removed
             if safe_str(path) in removed:
                 # returning None is a way to mark node for removal
                 return None
 
             # check if this path is added
             for node in updated:
                 if safe_bytes(node['path']) == path:
                     return memfilectx(
                         _repo,
                         changectx=ctx,
                         path=safe_bytes(node['path']),
                         data=safe_bytes(node['content']),
                         islink=False,
                         isexec=bool(node['mode'] & stat.S_IXUSR),
                         copysource=False)
             abort_exc = exceptions.AbortException()
             raise abort_exc(f"Given path haven't been marked as added, changed or removed ({path})")
 
         if publishing:
             new_commit_phase = b'public'
         else:
             new_commit_phase = b'draft'
         with repo.ui.configoverride({(b'phases', b'new-commit'): new_commit_phase}):
             kwargs = {safe_bytes(k): safe_bytes(v) for k, v in extra.items()}
             commit_ctx = memctx(
                 repo=repo,
                 parents=parents,
                 text=safe_bytes(message),
                 files=[safe_bytes(x) for x in files],
                 filectxfn=_filectxfn,
                 user=safe_bytes(user),
                 date=(commit_time, commit_timezone),
                 extra=kwargs)
 
             n = repo.commitctx(commit_ctx)
             new_id = hex(n)
 
             return new_id
 
     @reraise_safe_exceptions
     def pull(self, wire, url, commit_ids=None):
         repo = self._factory.repo(wire)
         # Disable any prompts for this repo
         repo.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
 
         remote = peer(repo, {}, safe_bytes(url))
         # Disable any prompts for this remote
         remote.ui.setconfig(b'ui', b'interactive', b'off', b'-y')
 
         if commit_ids:
             commit_ids = [bin(commit_id) for commit_id in commit_ids]
 
         return exchange.pull(
             repo, remote, heads=commit_ids, force=None).cgresult
 
     @reraise_safe_exceptions
     def pull_cmd(self, wire, source, bookmark='', branch='', revision='', hooks=True):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'], hooks=hooks)
 
         source = safe_bytes(source)
 
         # Mercurial internally has a lot of logic that checks ONLY if
         # option is defined, we just pass those if they are defined then
         opts = {}
 
         if bookmark:
             opts['bookmark'] = [safe_bytes(x) for x in bookmark] \
                 if isinstance(bookmark, list) else safe_bytes(bookmark)
 
         if branch:
             opts['branch'] = [safe_bytes(x) for x in branch] \
                 if isinstance(branch, list) else safe_bytes(branch)
 
         if revision:
             opts['rev'] = [safe_bytes(x) for x in revision] \
                 if isinstance(revision, list) else safe_bytes(revision)
 
         commands.pull(baseui, repo, source, **opts)
 
     @reraise_safe_exceptions
     def push(self, wire, revisions, dest_path, hooks: bool = True, push_branches: bool = False):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'], hooks=hooks)
 
         revisions = [safe_bytes(x) for x in revisions] \
             if isinstance(revisions, list) else safe_bytes(revisions)
 
         commands.push(baseui, repo, safe_bytes(dest_path),
                       rev=revisions,
                       new_branch=push_branches)
 
     @reraise_safe_exceptions
     def strip(self, wire, revision, update, backup):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         hgext_strip.strip(
             repo.baseui, repo, ctx.node(), update=update, backup=backup)
 
     @reraise_safe_exceptions
     def get_unresolved_files(self, wire):
         repo = self._factory.repo(wire)
 
         log.debug('Calculating unresolved files for repo: %s', repo)
         output = io.BytesIO()
 
         def write(data, **unused_kwargs):
             output.write(data)
 
         baseui = self._factory._create_config(wire['config'])
         baseui.write = write
 
         commands.resolve(baseui, repo, list=True)
         unresolved = output.getvalue().splitlines(0)
         return unresolved
 
     @reraise_safe_exceptions
     def merge(self, wire, revision):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         repo.ui.setconfig(b'ui', b'merge', b'internal:dump')
 
         # In case of sub repositories are used mercurial prompts the user in
         # case of merge conflicts or different sub repository sources. By
         # setting the interactive flag to `False` mercurial doesn't prompt the
         # used but instead uses a default value.
         repo.ui.setconfig(b'ui', b'interactive', False)
         commands.merge(baseui, repo, rev=safe_bytes(revision))
 
     @reraise_safe_exceptions
     def merge_state(self, wire):
         repo = self._factory.repo(wire)
         repo.ui.setconfig(b'ui', b'merge', b'internal:dump')
 
         # In case of sub repositories are used mercurial prompts the user in
         # case of merge conflicts or different sub repository sources. By
         # setting the interactive flag to `False` mercurial doesn't prompt the
         # used but instead uses a default value.
         repo.ui.setconfig(b'ui', b'interactive', False)
         ms = hg_merge.mergestate(repo)
         return [x for x in ms.unresolved()]
 
     @reraise_safe_exceptions
     def commit(self, wire, message, username, close_branch=False):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         repo.ui.setconfig(b'ui', b'username', safe_bytes(username))
         commands.commit(baseui, repo, message=safe_bytes(message), close_branch=close_branch)
 
     @reraise_safe_exceptions
     def rebase(self, wire, source='', dest='', abort=False):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         repo.ui.setconfig(b'ui', b'merge', b'internal:dump')
         # In case of sub repositories are used mercurial prompts the user in
         # case of merge conflicts or different sub repository sources. By
         # setting the interactive flag to `False` mercurial doesn't prompt the
         # used but instead uses a default value.
         repo.ui.setconfig(b'ui', b'interactive', False)
 
         rebase.rebase(baseui, repo, base=safe_bytes(source or ''), dest=safe_bytes(dest or ''),
                       abort=abort, keep=not abort)
 
     @reraise_safe_exceptions
     def tag(self, wire, name, revision, message, local, user, tag_time, tag_timezone):
         repo = self._factory.repo(wire)
         ctx = self._get_ctx(repo, revision)
         node = ctx.node()
 
         date = (tag_time, tag_timezone)
         try:
             hg_tag.tag(repo, safe_bytes(name), node, safe_bytes(message), local, safe_bytes(user), date)
         except Abort as e:
             log.exception("Tag operation aborted")
             # Exception can contain unicode which we convert
             raise exceptions.AbortException(e)(repr(e))
 
     @reraise_safe_exceptions
     def bookmark(self, wire, bookmark, revision=''):
         repo = self._factory.repo(wire)
         baseui = self._factory._create_config(wire['config'])
         revision = revision or ''
         commands.bookmark(baseui, repo, safe_bytes(bookmark), rev=safe_bytes(revision), force=True)
 
     @reraise_safe_exceptions
     def install_hooks(self, wire, force=False):
         # we don't need any special hooks for Mercurial
         pass
 
     @reraise_safe_exceptions
     def get_hooks_info(self, wire):
         return {
             'pre_version': vcsserver.__version__,
             'post_version': vcsserver.__version__,
         }
 
     @reraise_safe_exceptions
     def set_head_ref(self, wire, head_name):
         pass
 
     @reraise_safe_exceptions
     def archive_repo(self, wire, archive_name_key, kind, mtime, archive_at_path,
                      archive_dir_name, commit_id, cache_config):
 
         def file_walker(_commit_id, path):
             repo = self._factory.repo(wire)
             ctx = repo[_commit_id]
             is_root = path in ['', '/']
             if is_root:
                 matcher = alwaysmatcher(badfn=None)
             else:
                 matcher = patternmatcher('', [(b'glob', safe_bytes(path)+b'/**', b'')], badfn=None)
             file_iter = ctx.manifest().walk(matcher)
 
             for fn in file_iter:
                 file_path = fn
                 flags = ctx.flags(fn)
                 mode = b'x' in flags and 0o755 or 0o644
                 is_link = b'l' in flags
 
                 yield ArchiveNode(file_path, mode, is_link, ctx[fn].data)
 
         return store_archive_in_cache(
             file_walker, archive_name_key, kind, mtime, archive_at_path, archive_dir_name, commit_id, cache_config=cache_config)