Merge pull request #549 from guyou/feature-pool-fine-tuning

Use new settings to fine tune the connection pool

searx/poolrequests.py

                               block=self._pool_block, **self._conn_params)
 
 
+connect = settings['outgoing'].get('pool_connections', 100)  # Magic number kept from previous code
+maxsize = settings['outgoing'].get('pool_maxsize', requests.adapters.DEFAULT_POOLSIZE)  # Picked from constructor
 if settings['outgoing'].get('source_ips'):
-    http_adapters = cycle(HTTPAdapterWithConnParams(pool_connections=100, source_address=(source_ip, 0))
+    http_adapters = cycle(HTTPAdapterWithConnParams(pool_connections=connect, pool_maxsize=maxsize,
+                                                    source_address=(source_ip, 0))
                           for source_ip in settings['outgoing']['source_ips'])
-    https_adapters = cycle(HTTPAdapterWithConnParams(pool_connections=100, source_address=(source_ip, 0))
+    https_adapters = cycle(HTTPAdapterWithConnParams(pool_connections=connect, pool_maxsize=maxsize,
+                                                     source_address=(source_ip, 0))
                            for source_ip in settings['outgoing']['source_ips'])
 else:
-    http_adapters = cycle((HTTPAdapterWithConnParams(pool_connections=100), ))
-    https_adapters = cycle((HTTPAdapterWithConnParams(pool_connections=100), ))
+    http_adapters = cycle((HTTPAdapterWithConnParams(pool_connections=connect, pool_maxsize=maxsize), ))
+    https_adapters = cycle((HTTPAdapterWithConnParams(pool_connections=connect, pool_maxsize=maxsize), ))
 
 
 class SessionSinglePool(requests.Session):

searx/settings.yml

 outgoing: # communication with search engines
     request_timeout : 2.0 # seconds
     useragent_suffix : "" # suffix of searx_useragent, could contain informations like an email address to the administrator
+    pool_connections : 100 # Number of different hosts
+    pool_maxsize : 10 # Number of simultaneous requests by host
 # uncomment below section if you want to use a proxy
 # see http://docs.python-requests.org/en/latest/user/advanced/#proxies
 # SOCKS proxies are not supported : see https://github.com/kennethreitz/requests/pull/478