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Protect against double subscription #77

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merged 3 commits into from
Feb 14, 2020
Merged

Protect against double subscription #77

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3e55d55
Protect against double subscription
danielballan Jan 21, 2020
2e37896
Stash sentinel in user_ns.
danielballan Jan 21, 2020
f2b597c
Fix typo
danielballan Jan 22, 2020
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7 changes: 7 additions & 0 deletions nslsii/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,10 @@ def configure_base(user_ns, broker_name, *,

>>>> configure_base(get_ipython().user_ns, 'chx');
"""
if configure_base.has_been_called:
raise RuntimeError(
"configure_base should only be called once per process.")
configure_base.has_been_called = True
ns = {} # We will update user_ns with this at the end.

# Set up a RunEngine and use metadata backed by a sqlite file.
Expand Down Expand Up @@ -206,6 +210,9 @@ def configure_base(user_ns, broker_name, *,
return list(ns)


configure_base.has_been_called = False


def configure_olog(user_ns, *, callback=None, subscribe=True):
"""
Setup a callback that publishes some metadata from the RunEngine to Olog.
Expand Down