request-wrapper: add gc.collect to every 25th request to clear up memory.

- we've indicated that general GC isn't so efficient. Manually triggering it would save lots of memory.

vcsserver/tweens/request_wrapper.py

@@ -1,65 +1,69 b''
 # RhodeCode VCSServer provides access to different vcs backends via network.
 # Copyright (C) 2014-2019 RhodeCode GmbH
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software Foundation,
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 
-
-
+import gc
 import time
 import logging
 
 
 from vcsserver.utils import safe_str
 
 
 log = logging.getLogger(__name__)
 
 
 def get_access_path(request):
     environ = request.environ
     return environ.get('PATH_INFO')
 
 
 def get_user_agent(environ):
     return environ.get('HTTP_USER_AGENT')
 
 
 class RequestWrapperTween(object):
     def __init__(self, handler, registry):
         self.handler = handler
         self.registry = registry
+        self.gc_max_requests = 25
 
         # one-time configuration code goes here
 
     def __call__(self, request):
         start = time.time()
         try:
             response = self.handler(request)
         finally:
             end = time.time()
             total = end - start
             count = request.request_count()
             log.info(
                 'Req[%4s] IP: %s %s Request to %s time: %.4fs [%s]',
                 count, '127.0.0.1', request.environ.get('REQUEST_METHOD'),
                 safe_str(get_access_path(request)), total, get_user_agent(request.environ))
 
+        if self.gc_max_requests and count % self.gc_max_requests == 0:
+            log.info('Performing gc.collect now')
+            gc.collect()
+
         return response
 
 
 def includeme(config):
     config.add_tween(
         'vcsserver.tweens.request_wrapper.RequestWrapperTween',
     )