Allow engine and metadata server start in any order

When the metadata server starts first, it will wait for the engine to come up
and only then registers it's hostname and port and becomes available.

Signed-off-by: Tomas Sedovic <tomas@sedovic.cz>

diff --git a/bin/heat-metadata b/bin/heat-metadata
index 985e0e32213c2edf0481111813c26d6762ef2fe6..c18ecadd92e45afd83f4df95f8bae7c5c1a06007 100755 (executable)
--- a/bin/heat-metadata
+++ b/bin/heat-metadata
@@ -45,9 +45,15 @@ LOG = logging.getLogger('heat.metadata')
 
 def send_address_to_engine(host, port):
     con = context.get_admin_context()
-    resp = rpc.call(con, 'engine',
-                    {'method': 'metadata_register_address',
-                     'args': {'url': 'http://%s:%s' % (host, port)}})
+    while True:
+        try:
+            resp = rpc.call(con, 'engine',
+                            {'method': 'metadata_register_address',
+                             'args': {'url': 'http://%s:%s' % (host, port)}})
+            LOG.info('registered the hostname and port with the engine.')
+            return
+        except rpc.common.Timeout:
+            LOG.info('Could not connect to the engine, retrying...')
 
 
 if __name__ == '__main__':