Support for python config file option in paster

It is now possible to specify a file with "config" as an application
configuration key in a paste deploy configuration file. This allows
paster applications to use the full range of gunicorn settings even
when using paste/pserve rather than gunicorn_paster.

Fixes #540.

docs/source/run.rst

@@ -115,6 +115,8 @@ you can specify the Gunicorn server settings in your configuration file::
     use = egg:gunicorn#main
     host = 127.0.0.1
     port = 5000
+    # Uncomment the line below to use other advanced gunicorn settings
+    #config = %(here)/gunicorn.conf.py
 
 And then as per usual::
 

examples/frameworks/pylonstest/development.ini

@@ -14,6 +14,8 @@ error_email_from = paste@localhost
 use = egg:gunicorn#main
 host = 127.0.0.1
 port = 5000
+# Uncomment and replace with a file containing advanced gunicorn configuration
+#config = %(here)/gunicorn.conf.py
 
 [app:main]
 use = egg:pylonstest

gunicorn/app/pasterapp.py

@@ -16,7 +16,7 @@ from paste.deploy import loadapp, loadwsgi
 SERVER = loadwsgi.SERVER
 
 from gunicorn.app.base import Application
-from gunicorn.config import Config
+from gunicorn.config import Config, get_default_config_file
 from gunicorn import util
 
 
@@ -126,17 +126,12 @@ class PasterServerApplication(PasterBaseApplication):
             sys.stderr.flush()
             sys.exit(1)
 
-    def load_config(self):
-        if not hasattr(self, "cfgfname"):
-            return
-
-        cfg = self.app_config()
-        for k, v in cfg.items():
-            try:
-                self.cfg.set(k.lower(), v)
-            except:
-                sys.stderr.write("Invalid value for %s: %s\n\n" % (k, v))
-                raise
+        if cfg.get("config"):
+            self.load_config_from_file(cfg["config"])
+        else:
+            default_config = get_defalult_config_file()
+            if default_config is not None:
+                self.load_config_from_file(default_config)
 
     def load(self):
         if hasattr(self, "cfgfname"):