added some assertions

1 files changed, 4 insertions, 0 deletions

diff --git a/wsgitools/scgi/forkpool.py b/wsgitools/scgi/forkpool.py
index 1ff2bee..6476458 100644
--- a/wsgitools/scgi/forkpool.py
+++ b/wsgitools/scgi/forkpool.py
@@ -85,6 +85,7 @@ class SCGIServer:
         maxworkers is the maximum number of workers that can be spawned on demand
         maxrequests is the number of requests a worker processes before dying
         """
+        assert hasattr(error, "write")
         self.wsgiapp = wsgiapp
         self.port = port
         self.interface = interface
@@ -217,7 +218,10 @@ class SCGIServer:
             "wsgi.multithread": False,
             "wsgi.multiprocess": True,
             "wsgi.run_once": False})
+
         result = self.wsgiapp(environ, start_response)
+        assert hasattr(result, "__iter__")
+
         for data in result:
             con.send(data)
         if hasattr(result, "close"):