Put back in old function and add deprecation warning

python/lsst/summit/utils/efdUtils.py

@@ -26,6 +26,7 @@
 import logging
 import pandas as pd
 import re
+from deprecated.sphinx import deprecated
 
 from .utils import getSite
 
@@ -47,6 +48,7 @@
     'getDayObsStartTime',
     'getDayObsEndTime',
     'getDayObsForTime',
+    'getSubTopics',  # deprecated, being remove in w_2023_50
     'getTopics',
 ]
 
@@ -531,6 +533,37 @@ def getDayObsForTime(time):
     return int((time + offset).utc.isot[:10].replace('-', ''))
 
 
+@deprecated(
+    reason="getSubTopics() has been replaced by getTopics() and using wildcards. "
+           "Will be removed after w_2023_50.",
+    version="w_2023_40",
+    category=FutureWarning,
+)
+def getSubTopics(client, topic):
+    """Get all the sub topics within a given topic.
+
+    Note that the topic need not be a complete one, for example, rather than
+    doing `getSubTopics(client, 'lsst.sal.ATMCS')` to get all the topics for
+    the AuxTel Mount Control System, you can do `getSubTopics(client,
+    'lsst.sal.AT')` to get all which relate to the AuxTel in general.
+
+    Parameters
+    ----------
+    client : `lsst_efd_client.efd_helper.EfdClient`
+        The EFD client to use.
+    topic : `str`
+        The topic to query.
+
+    Returns
+    -------
+    subTopics : `list` of `str`
+        The sub topics.
+    """
+    loop = asyncio.get_event_loop()
+    topics = loop.run_until_complete(client.get_topics())
+    return sorted([t for t in topics if t.startswith(topic)])
+
+
 def getTopics(client, toFind, caseSensitive=False):
     """Return all the strings in topics which match the topic query string.