From 227a81b534c2f77f6cdb10a5936c6b1dfb8c3ec6 Mon Sep 17 00:00:00 2001
From: Christopher Allan Webber <cwebber@dustycloud.org>
Date: Thu, 9 Oct 2014 18:24:14 -0500
Subject: [PATCH] Add and use paste server selector.  Yeah!  Smart solutions!
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This commit sponsored by Tryggvi Björgvinsson.  Thank you!
---
 mediagoblin/app.py | 31 +++++++++++++++++++++++++++++++
 paste.py3.ini      |  2 +-
 setup.py           |  3 +++
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/mediagoblin/app.py b/mediagoblin/app.py
index b3e41835..9014bf47 100644
--- a/mediagoblin/app.py
+++ b/mediagoblin/app.py
@@ -290,3 +290,34 @@ def paste_app_factory(global_config, **app_config):
     mgoblin_app = hook_transform('wrap_wsgi', mgoblin_app)
 
     return mgoblin_app
+
+
+def paste_server_selector(wsgi_app, global_config=None, **app_config):
+    """
+    Select between gunicorn and paste depending on what ia available
+    """
+    # See if we can import the gunicorn server...
+    # otherwise we'll use the paste server
+    try:
+        import gunicorn
+    except ImportError:
+        gunicorn = None
+
+    if gunicorn is None:
+        # use paste
+        from paste.httpserver import server_runner
+
+        cleaned_app_config = dict(
+            [(key, app_config[key])
+             for key in app_config
+             if key in ["host", "port", "handler", "ssl_pem", "ssl_context",
+                        "server_version", "protocol_version", "start_loop",
+                        "daemon_threads", "socket_timeout", "use_threadpool",
+                        "threadpool_workers", "threadpool_options",
+                        "request_queue_size"]])
+
+        return server_runner(wsgi_app, global_config, **cleaned_app_config)
+    else:
+        # use gunicorn
+        from gunicorn.app.pasterapp import PasterServerApplication
+        return PasterServerApplication(wsgi_app, global_config, **app_config)
diff --git a/paste.py3.ini b/paste.py3.ini
index afd5982b..77364c09 100644
--- a/paste.py3.ini
+++ b/paste.py3.ini
@@ -52,7 +52,7 @@ debug = false
 # The server that is run by default.
 # By default, should only be accessable locally
 [server:main]
-use = egg:gunicorn
+use = egg:mediagoblin#paste_server_selector
 host = 127.0.0.1
 port = 6543
 # Gunicorn settings. See http://docs.gunicorn.org/en/19.0/settings.html
diff --git a/setup.py b/setup.py
index 562252e3..624aa409 100644
--- a/setup.py
+++ b/setup.py
@@ -123,6 +123,9 @@ try:
         [paste.app_factory]
         app = mediagoblin.app:paste_app_factory
 
+        [paste.server_runner]
+        paste_server_selector = mediagoblin.app:paste_server_selector
+
         [paste.filter_app_factory]
         errors = mediagoblin.errormiddleware:mgoblin_error_middleware