Make WSGI app names are now evaled in the module namespace.

This allows people to pass info from the command line to a WSGI
application. See examples/alt_spec.py for code that uses this
method. Example invocation:

    $ gunicorn 'alt_spec:load("my arg here")'

Notice the single quotes to avoid shell escape semantics.

Closes #56
Closes #40

examples/alt_spec.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -
+#
+# An example of how to pass information from the command line to
+# a WSGI app. Only applies to the native WSGI workers used by
+# Gunicorn sync (default) workers.
+#
+#   $ gunicorn 'alt_spec:load(arg)'
+#
+# Single quoting is generally necessary for shell escape semantics.
+#
+# This file is part of gunicorn released under the MIT license. 
+# See the NOTICE for more information.
+
+def load(arg):
+    def app(environ, start_response):
+        data = 'Hello, %s!\n' % arg
+        status = '200 OK'
+        response_headers = [
+            ('Content-type','text/plain'),
+            ('Content-Length', str(len(data)))
+        ]
+        start_response(status, response_headers)
+        return iter([data])
+    return app
+

gunicorn/util.py

@@ -10,6 +10,7 @@ import os
 import pkg_resources
 import resource
 import socket
+import sys
 import textwrap
 import time
 
@@ -174,13 +175,9 @@ def import_app(module):
         module, obj = module, "application"
     else:
         module, obj = parts[0], parts[1]
-    mod = __import__(module)
+    __import__(module)
-    parts = module.split(".")
+    mod = sys.modules[module]
-    for p in parts[1:]:
+    app = eval(obj, mod.__dict__)
-        mod = getattr(mod, p, None)
-        if mod is None:
-            raise ImportError("Failed to import: %s" % module)
-    app = getattr(mod, obj, None)
     if app is None:
         raise ImportError("Failed to find application object: %r" % obj)
     if not callable(app):
@@ -237,4 +234,4 @@ def daemonize():
         
         os.open(REDIRECT_TO, os.O_RDWR)
         os.dup2(0, 1)
-        os.dup2(0, 2)
+        os.dup2(0, 2)