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Move "desynced" logic into a predicate

vlm_plotz_backup
Tyler Goodlet 2021-10-05 08:27:03 -04:00
parent b3ed09249a
commit 9cd63ffc99
1 changed files with 17 additions and 23 deletions
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40
piker/fsp/_engine.py
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@ -270,21 +270,23 @@ async def cascade(
async for msg in stream:
# respawn the compute task if the source
# array has been updated such that we compute
# new history from the (prepended) source.
diff = src.index - dst.index
def desynced(src: ShmArray, dst: ShmArray) -> bool:
diff = src.index - dst.index
len_diff = abs(len(src.array) - len(dst.array))
return (
# the source is likely backfilling and we must
# sync history calculations
len_diff > 2 or
# new_len = len(src.array)
# we aren't step synced to the source and may be
# leading/lagging by a step
diff > 1 or
diff < 0
)
async def poll_and_sync_to_step(tracker):
diff = src.index - dst.index
while True:
if diff in (0, 1):
break
while desynced(src, dst):
tracker, index = await resync(tracker)
diff = src.index - dst.index
# log.info(
# '\n'.join((
# f'history index after sync: {index}',
@ -294,18 +296,10 @@ async def cascade(
return tracker, diff
# log.debug(f'diff {diff}')
if (
# the source is likely backfilling and we must
# sync history calculations
abs(len(src.array) - len(dst.array)) > 0 or
# we aren't step synced to the source and may be
# leading/lagging by a step
diff > 1 or
diff < 0
):
# respawn the compute task if the source
# array has been updated such that we compute
# new history from the (prepended) source.
if desynced(src, dst):
tracker, diff = await poll_and_sync_to_step(tracker)
# skip adding a last bar since we should be