avoid _wsgioutputfile <-> _wsgirequest circular reference

We use the _wsgirequest object itself as the output file object.

To avoid a "self.out = self" which would create another circular
reference, we make the "out" attribute a trivial property.

mercurial/hgweb/request.py

@@ -17,20 +17,6 b' class wsgiapplication(object):'
     def __call__(self, wsgienv, start_response):
         return _wsgirequest(self.destmaker(), wsgienv, start_response)
 
-class _wsgioutputfile(object):
-    def __init__(self, request):
-        self.request = request
-
-    def write(self, data):
-        self.request.write(data)
-    def writelines(self, lines):
-        for line in lines:
-            self.write(line)
-    def flush(self):
-        return None
-    def close(self):
-        return None
-
 class _wsgirequest(object):
     def __init__(self, destination, wsgienv, start_response):
         version = wsgienv['wsgi.version']
@@ -38,7 +24,6 b' class _wsgirequest(object):'
             raise RuntimeError("Unknown and unsupported WSGI version %d.%d" \
                                % version)
         self.inp = wsgienv['wsgi.input']
-        self.out = _wsgioutputfile(self)
         self.server_write = None
         self.err = wsgienv['wsgi.errors']
         self.threaded = wsgienv['wsgi.multithread']
@@ -50,6 +35,8 b' class _wsgirequest(object):'
         self.headers = []
         destination.run_wsgi(self)
 
+    out = property(lambda self: self)
+
     def __iter__(self):
         return iter([])
 
@@ -76,6 +63,16 b' class _wsgirequest(object):'
                     if inst[0] != errno.ECONNRESET:
                         raise
 
+    def writelines(self, lines):
+        for line in lines:
+            self.write(line)
+
+    def flush(self):
+        return None
+
+    def close(self):
+        return None
+
     def header(self, headers=[('Content-type','text/html')]):
         self.headers.extend(headers)