begin adding port support, catch OSError from Flask

scripts/uncloud

@@ -34,6 +34,8 @@ if __name__ == '__main__':
     subparsers = arg_parser.add_subparsers(dest="command")
 
     api_parser = subparsers.add_parser("api", parents=[parent_parser])
+    api_parser.add_argument("--port", "-p")
+
     host_parser = subparsers.add_parser("host")
     host_parser.add_argument("--hostname", required=True)
 

uncloud/api/main.py

@@ -17,7 +17,7 @@ from uncloud.shared import shared
 
 from . import schemas
 from .helper import generate_mac, mac2ipv6
-
+from uncloud import UncloudException
 
 logger = logging.getLogger(__name__)
 
@@ -561,29 +561,42 @@ api.add_resource(ListHost, "/host/list")
 api.add_resource(CreateNetwork, "/network/create")
 
 
-def main(debug=False):
-    image_stores = list(
-        shared.etcd_client.get_prefix(
-            settings["etcd"]["image_store_prefix"], value_in_json=True
+def main(debug=False, port=None):
+    try:
+        image_stores = list(
+            shared.etcd_client.get_prefix(
+                settings["etcd"]["image_store_prefix"], value_in_json=True
+            )
         )
-    )
-    if not image_stores:
-        data = {
-            "is_public": True,
-            "type": "ceph",
-            "name": "images",
-            "description": "first ever public image-store",
-            "attributes": {"list": [], "key": [], "pool": "images"},
-        }
+    except KeyError:
+        image_stores = False
 
-        shared.etcd_client.put(
-            join_path(
-                settings["etcd"]["image_store_prefix"], uuid4().hex
-            ),
-            json.dumps(data),
-        )
+    # Do not inject default values that might be very wrong
+    # fail when required, not before
+    #
+    # if not image_stores:
+    #     data = {
+    #         "is_public": True,
+    #         "type": "ceph",
+    #         "name": "images",
+    #         "description": "first ever public image-store",
+    #         "attributes": {"list": [], "key": [], "pool": "images"},
+    #     }
 
-    app.run(host="::", debug=False)
+    #     shared.etcd_client.put(
+    #         join_path(
+    #             settings["etcd"]["image_store_prefix"], uuid4().hex
+    #         ),
+    #         json.dumps(data),
+    #     )
+
+    if port:
+        app_port = port
+
+    try:
+        app.run(host="::", debug=False)
+    except OSError as e:
+        raise UncloudException("Failed to start Flask: {}".format(e))
 
 
 if __name__ == "__main__":