Add config for saving access creds between runs

piker/brokers/config.py

@@ -0,0 +1,30 @@
+"""
+Broker configuration mgmt.
+"""
+from os import path
+import configparser
+from ..log import get_logger
+
+log = get_logger('broker-config')
+
+_broker_conf_path = path.join(path.dirname(__file__), 'brokers.ini')
+
+
+def load() -> (configparser.ConfigParser, str):
+    """Load broker config.
+
+    Create a ``broker.ini`` file if one dne.
+    """
+    config = configparser.ConfigParser()
+    # mode = 'r' if path.exists(_broker_conf_path) else 'a'
+    read = config.read(_broker_conf_path)
+    log.debug(f"Read config file {_broker_conf_path}")
+    return config, _broker_conf_path
+
+
+def write(config: configparser.ConfigParser) -> None:
+    """Write broker config to disk.
+    """
+    log.debug(f"Writing config file {_broker_conf_path}")
+    with open(_broker_conf_path, 'w') as cf:
+        return config.write(cf)