import_csv was left with several synchronous idioms:
- search_record is a coroutine function, but was called without await.
The returned coroutine is always truthy, so the rescan on incomplete
discovery data never happened, and iterating the result raised
TypeError: 'coroutine' object is not iterable
- the node creation loop iterated an async generator with plain for
- the per-node discovery assignment was forked off with os.fork() while
the event loop was running, and the child then built a fresh session
on the inherited selector
Assign discovery entries with asyncio.gather instead of a forked child,
which keeps the assignments concurrent and lets their exit codes
propagate. The forked child always ended in sys.exit(0), so its
accumulated errorcode was discarded.
Markus Hilger
7ebc1dc616