Only install the nginx hub if we're actually using nginx, because the import always works, so that wasn't a good test of whether to use it or not.

eventlet/api.py

@@ -186,14 +186,7 @@ def exc_after(seconds, exc):
     return call_after(seconds, switch, getcurrent(), None, exc)
 
 
-def get_default_hub():
-    ## TODO some sort of plugin system?
-    try:
-        import eventlet.hubs.nginx
-        return eventlet.hubs.nginx
-    except ImportError:
-        pass
-        
+def get_default_hub():        
     try:
         import eventlet.hubs.libevent
         return eventlet.hubs.libevent

eventlet/nginx_mod_wsgi_support.py

@@ -4,6 +4,8 @@ import sys
 from eventlet import api
 from eventlet import httpc
 
+from eventlet.hubs import nginx
+
 
 def real_application(env, start_response):
     #result = httpc.get('http://127.0.0.1:8081/')
@@ -23,6 +25,9 @@ def wrap_application(master, env, start_response):
 def application(env, start_response):
     hub = api.get_hub()
 
+    if not isinstance(hub, nginx.Hub):
+        api.use_hub(nginx)
+
     hub.poll_register = env['ngx.poll_register']
     hub.poll_unregister = env['ngx.poll_unregister']
     hub.sleep = env['ngx.sleep']