dbhub: do not use as context manager, turn close exceptions into warnings, do not close devices early in worker

artiq/frontend/artiq_run.py

@@ -154,12 +154,15 @@ def run(with_file=False):
     pdb = FlatFileDB(args.pdb)
     pdb.hooks.append(SimpleParamLogger())
     rdb = ResultDB(lambda description: None, lambda mod: None)
+    dbh = DBHub(ddb, pdb, rdb)
 
-    with DBHub(ddb, pdb, rdb) as dbh:
+    try:
         exp_inst = _build_experiment(dbh, args)
         rdb.build()
         exp_inst.run()
         exp_inst.analyze()
+    finally:
+        dbh.close_devices()
 
     if args.hdf5 is not None:
         with h5py.File(args.hdf5, "w") as f:

artiq/master/worker_db.py

@@ -1,11 +1,15 @@
 from collections import OrderedDict
 import importlib
+import logging
 
 from artiq.protocols.sync_struct import Notifier
 from artiq.protocols.pc_rpc import Client, BestEffortClient
 from artiq.master.results import result_dict_to_hdf5
 
 
+logger = logging.get_logger(__name__)
+
+
 class ResultDB:
     def __init__(self, init_rt_results, update_rt_results):
         self.init_rt_results = init_rt_results
@@ -108,15 +112,11 @@ class DBHub:
         """Closes all active devices, in the opposite order as they were
         requested."""
         for dev in reversed(list(self.active_devices.values())):
+            try:
                 if isinstance(dev, (Client, BestEffortClient)):
                     dev.close_rpc()
                 elif hasattr(dev, "close"):
                     dev.close()
+            except Exception as e:
+                logger.warning("Exception %r when closing device %r", e, dev)
         self.active_devices.clear()
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        self.close_devices()
-        return False  # do not suppress exceptions within context

artiq/master/worker_impl.py

@@ -97,8 +97,9 @@ def main():
     exp_inst = None
 
     rdb = ResultDB(init_rt_results, update_rt_results)
+    dbh = DBHub(ParentDDB, ParentPDB, rdb)
 
-    with DBHub(ParentDDB, ParentPDB, rdb) as dbh:
+    try:
         while True:
             obj = get_object()
             action = obj["action"]
@@ -115,7 +116,6 @@ def main():
                 put_object({"action": "completed"})
             elif action == "run":
                 exp_inst.run()
-                dbh.close_devices()
                 put_object({"action": "completed"})
             elif action == "analyze":
                 exp_inst.analyze()
@@ -129,6 +129,8 @@ def main():
                 put_object({"action": "completed"})
             elif action == "terminate":
                 break
+    finally:
+        dbh.close_devices()
 
 if __name__ == "__main__":
     main()