fix(pycurl): report nicer error log on failed calls in pycurl

rhodecode/lib/vcs/__init__.py

@@ -1,189 +1,194 b''
 # 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 Affero General Public License, version 3
 # (only), as published by the Free Software Foundation.
 #
 # 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 Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # This program is dual-licensed. If you wish to learn more about the
 # RhodeCode Enterprise Edition, including its added features, Support services,
 # and proprietary license terms, please see https://rhodecode.com/licenses/
 
 """
 Various version Control System version lib (vcs) management abstraction layer
 for Python. Build with server client architecture.
 """
 import io
 import atexit
 import logging
 
 import rhodecode
 from rhodecode.lib.str_utils import safe_bytes
 from rhodecode.lib.vcs.conf import settings
 from rhodecode.lib.vcs.backends import get_vcs_instance, get_backend
 from rhodecode.lib.vcs.exceptions import (
     VCSError, RepositoryError, CommitError, VCSCommunicationError)
 
 __all__ = [
     'get_vcs_instance', 'get_backend',
     'VCSError', 'RepositoryError', 'CommitError', 'VCSCommunicationError',
     'CurlSession', 'CurlResponse'
 ]
 
 log = logging.getLogger(__name__)
 
 # The pycurl library directly accesses C API functions and is not patched by
 # gevent. This will potentially lead to deadlocks due to incompatibility to
 # gevent. Therefore we check if gevent is active and import a gevent compatible
 # wrapper in that case.
 try:
     from gevent import monkey
     if monkey.is_module_patched('__builtin__'):
         import geventcurl as pycurl
         log.debug('Using gevent comapatible pycurl: %s', pycurl)
     else:
         import pycurl
 except ImportError:
     import pycurl
 
 
 def connect_http(server_and_port):
     log.debug('Initialized VCSServer connections to %s.', server_and_port)
 
     from rhodecode.lib.vcs import connection, client_http
     from rhodecode.lib.middleware.utils import scm_app
 
     session_factory = client_http.ThreadlocalSessionFactory()
 
     connection.Git = client_http.RemoteVCSMaker(
         server_and_port, '/git', 'git', session_factory)
     connection.Hg = client_http.RemoteVCSMaker(
         server_and_port, '/hg', 'hg', session_factory)
     connection.Svn = client_http.RemoteVCSMaker(
         server_and_port, '/svn', 'svn', session_factory)
     connection.Service = client_http.ServiceConnection(
         server_and_port, '/_service', session_factory)
 
     scm_app.HG_REMOTE_WSGI = client_http.VcsHttpProxy(
         server_and_port, '/proxy/hg')
     scm_app.GIT_REMOTE_WSGI = client_http.VcsHttpProxy(
         server_and_port, '/proxy/git')
 
     @atexit.register
     def free_connection_resources():
         connection.Git = None
         connection.Hg = None
         connection.Svn = None
         connection.Service = None
 
 
 def connect_vcs(server_and_port, protocol):
     """
     Initializes the connection to the vcs server.
 
     :param server_and_port: str, e.g. "localhost:9900"
     :param protocol: str or "http"
     """
     if protocol == 'http':
         connect_http(server_and_port)
     else:
         raise Exception(f'Invalid vcs server protocol "{protocol}"')
 
 
 class CurlSession(object):
     """
     Modeled so that it provides a subset of the requests interface.
 
     This has been created so that it does only provide a minimal API for our
     needs. The parts which it provides are based on the API of the library
     `requests` which allows us to easily benchmark against it.
 
     Please have a look at the class :class:`requests.Session` when you extend
     it.
     """
     CURL_UA = f'RhodeCode HTTP {rhodecode.__version__}'
 
     def __init__(self):
         curl = pycurl.Curl()
         # TODO: johbo: I did test with 7.19 of libcurl. This version has
         # trouble with 100 - continue being set in the expect header. This
         # can lead to massive performance drops, switching it off here.
 
         curl.setopt(curl.TCP_NODELAY, True)
         curl.setopt(curl.PROTOCOLS, curl.PROTO_HTTP)
         curl.setopt(curl.USERAGENT, safe_bytes(self.CURL_UA))
         curl.setopt(curl.SSL_VERIFYPEER, 0)
         curl.setopt(curl.SSL_VERIFYHOST, 0)
         self._curl = curl
 
     def post(self, url, data, allow_redirects=False, headers=None):
         headers = headers or {}
         # format is ['header_name1: header_value1', 'header_name2: header_value2'])
         headers_list = [b"Expect:"] + [safe_bytes('{}: {}'.format(k, v)) for k, v in headers.items()]
         response_buffer = io.BytesIO()
 
         curl = self._curl
         curl.setopt(curl.URL, url)
         curl.setopt(curl.POST, True)
         curl.setopt(curl.POSTFIELDS, data)
         curl.setopt(curl.FOLLOWLOCATION, allow_redirects)
         curl.setopt(curl.WRITEDATA, response_buffer)
         curl.setopt(curl.HTTPHEADER, headers_list)
-        curl.perform()
+
+        try:
+            curl.perform()
+        except pycurl.error as exc:
+            log.error('Failed to call endpoint url: {} using pycurl'.format(url))
+            raise
 
         status_code = curl.getinfo(pycurl.HTTP_CODE)
         content_type = curl.getinfo(pycurl.CONTENT_TYPE)
         return CurlResponse(response_buffer, status_code, content_type)
 
 
 class CurlResponse(object):
     """
     The response of a request, modeled after the requests API.
 
     This class provides a subset of the response interface known from the
     library `requests`. It is intentionally kept similar, so that we can use
     `requests` as a drop in replacement for benchmarking purposes.
     """
 
     def __init__(self, response_buffer, status_code, content_type=''):
         self._response_buffer = response_buffer
         self._status_code = status_code
         self._content_type = content_type
 
     def __repr__(self):
         return f'CurlResponse(code={self._status_code}, content_type={self._content_type})'
 
     @property
     def content(self):
         try:
             return self._response_buffer.getvalue()
         finally:
             self._response_buffer.close()
 
     @property
     def status_code(self):
         return self._status_code
 
     @property
     def content_type(self):
         return self._content_type
 
     def iter_content(self, chunk_size):
         self._response_buffer.seek(0)
         while 1:
             chunk = self._response_buffer.read(chunk_size)
             if not chunk:
                 break
             yield chunk
 
 
 def _create_http_rpc_session():
     session = CurlSession()
     return session