bitbake: hashserv: Add database column query API

Adds an API to retrieve the columns that can be queried on from the
database backend. This prevents front end applications from needing to
hardcode the query columns

(Bitbake rev: abfce2b68bdab02ea2e9a63fbb3b9e270428a0a6)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-hashclient

@@ -174,6 +174,10 @@ def main():
         total_rows = sum(t["rows"] for t in usage.values())
         print(f"Total rows: {total_rows}")
 
+    def handle_get_db_query_columns(args, client):
+        columns = client.get_db_query_columns()
+        print("\n".join(sorted(columns)))
+
     parser = argparse.ArgumentParser(description='Hash Equivalence Client')
     parser.add_argument('--address', default=DEFAULT_ADDRESS, help='Server address (default "%(default)s")')
     parser.add_argument('--log', default='WARNING', help='Set logging level')
@@ -239,6 +243,9 @@ def main():
     db_usage_parser = subparsers.add_parser('get-db-usage', help="Database Usage")
     db_usage_parser.set_defaults(func=handle_get_db_usage)
 
+    db_query_columns_parser = subparsers.add_parser('get-db-query-columns', help="Show columns that can be used in database queries")
+    db_query_columns_parser.set_defaults(func=handle_get_db_query_columns)
+
     args = parser.parse_args()
 
     logger = logging.getLogger('hashserv')