Add wsgiapp decorator.

1 files changed, 44 insertions, 0 deletions

diff --git a/repoze/bfg/wsgi.py b/repoze/bfg/wsgi.py
new file mode 100644
index 000000000..4efe40afc
--- /dev/null
+++ b/repoze/bfg/wsgi.py
@@ -0,0 +1,44 @@
+from webob import Response
+
+def wsgiapp(wrapped):
+    """ Decorator to turn a WSGI application into a repoze.bfg view callable.
+
+    E.g.::
+
+      @wsgiapp
+      def hello_world(environ, start_response):
+          body = 'Hello world'
+          start_response('200 OK', [ ('Content-Type', 'text/plain'),
+                                     ('Content-Length', len(body)) ] )
+          return [body]
+
+    Allows the following view declaration to be made::
+
+       <bfg:view
+            view=".views.hello_world"
+            name="hello_world.txt"
+            context="*"
+            />
+
+    The wsgiapp decorator will convert the result of the WSGI
+    application to a Response and return it to repoze.bfg as if the
+    WSGI app were a repoze.bfg view.
+    """
+    def _curried(context, request):
+        caught = []
+        def catch_start_response(status, headers, exc_info=None):
+            caught[:] = (status, headers, exc_info)
+        environ = request.environ
+        body = wrapped(environ, catch_start_response)
+        if caught: 
+            status, headers, exc_info = caught
+            response = Response()
+            response.app_iter = body
+            response.status = status
+            response.headerlist = headers
+            return response
+        else:
+            raise RuntimeError('WSGI start_response not called')
+    _curried.__name__ = wrapped.__name__
+    return _curried
+