Add endpoints to list renderers and exporters

 * Add two new endpoints, `/renderers` and `/exporters`.  Each returns
   a JSON object mapping supported extensions to the renderer or
   exporter class that handles them.  All extensions are prefixed by a
   period.

 [SVCS-350]

Author: Johnetordoff

mfr/server/app.py

@@ -15,6 +15,8 @@
 from mfr.server.handlers.export import ExportHandler
 from mfr.server.handlers.render import RenderHandler
 from mfr.server.handlers.status import StatusHandler
+from mfr.server.handlers.exporters import ExportersHandler
+from mfr.server.handlers.renderers import RenderersHandler
 from mfr.server.handlers.core import ExtensionsStaticFileHandler
 
 logger = logging.getLogger(__name__)
@@ -37,7 +39,9 @@ def make_app(debug):
             (r'/static/(.*)', tornado.web.StaticFileHandler, {'path': server_settings.STATIC_PATH}),
             (r'/assets/(.*?)/(.*\..*)', ExtensionsStaticFileHandler),
             (r'/export', ExportHandler),
+            (r'/exporters', ExportersHandler),
             (r'/render', RenderHandler),
+            (r'/renderers', RenderersHandler),
             (r'/status', StatusHandler),
         ],
         debug=debug,

mfr/server/handlers/exporters.py

@@ -0,0 +1,16 @@
+import pkg_resources
+import tornado.web
+
+
+class ExportersHandler(tornado.web.RequestHandler):
+
+    def get(self):
+        """List available exporters"""
+
+        exporters = {}
+        for ep in pkg_resources.iter_entry_points(group='mfr.exporters'):
+            exporters.update({ep.name: ep.load().__name__})
+
+        self.write({
+            'exporters': exporters,
+        })

mfr/server/handlers/renderers.py

@@ -0,0 +1,16 @@
+import pkg_resources
+import tornado.web
+
+
+class RenderersHandler(tornado.web.RequestHandler):
+
+    def get(self):
+        """List available renderers"""
+
+        renderers = {}
+        for ep in pkg_resources.iter_entry_points(group='mfr.renderers'):
+            renderers.update({ep.name: ep.load().__name__})
+
+        self.write({
+            'renderers': renderers,
+        })

tests/server/handlers/test_exporters.py

@@ -0,0 +1,21 @@
+import json
+
+import pkg_resources
+from tornado import testing
+
+from tests import utils
+
+
+class TestExportersHandler(utils.HandlerTestCase):
+
+    @testing.gen_test
+    def test_get_status(self):
+        resp = yield self.http_client.fetch(self.get_url('/exporters'))
+
+        exporters = {}
+        for ep in pkg_resources.iter_entry_points(group='mfr.exporters'):
+            exporters.update({ep.name: ep.load().__name__})
+
+        data = json.loads(resp.body.decode('utf-8'))
+        assert resp.code == 200
+        assert data['exporters'] == exporters

tests/server/handlers/test_renderers.py

@@ -0,0 +1,21 @@
+import json
+
+import pkg_resources
+from tornado import testing
+
+from tests import utils
+
+
+class TestRenderersHandler(utils.HandlerTestCase):
+
+    @testing.gen_test
+    def test_get_status(self):
+        resp = yield self.http_client.fetch(self.get_url('/renderers'))
+
+        renderers = {}
+        for ep in pkg_resources.iter_entry_points(group='mfr.renderers'):
+            renderers.update({ep.name: ep.load().__name__})
+
+        data = json.loads(resp.body.decode('utf-8'))
+        assert resp.code == 200
+        assert data['renderers'] == renderers