Make hist shm token optional to allow for FSPs

epoch_index_backup
Tyler Goodlet 2022-11-24 13:29:37 -05:00
parent 13e86fbe30
commit d3be4caa6a
1 changed files with 14 additions and 6 deletions

View File

@ -74,9 +74,12 @@ class Flume(Struct):
'''
symbol: Symbol
first_quote: dict
_hist_shm_token: _Token
_rt_shm_token: _Token
# optional since some data flows won't have a "downsampled" history
# buffer/stream (eg. FSPs).
_hist_shm_token: _Token | None = None
# private shm refs loaded dynamically from tokens
_hist_shm: ShmArray | None = None
_rt_shm: ShmArray | None = None
@ -104,7 +107,14 @@ class Flume(Struct):
@property
def hist_shm(self) -> ShmArray:
if self._hist_shm is None:
if self._hist_shm_token is None:
raise RuntimeError(
'No shm token has been set for the history buffer?'
)
if (
self._hist_shm is None
):
self._hist_shm = attach_shm_array(
token=self._hist_shm_token,
readonly=True,
@ -288,16 +298,14 @@ class Flume(Struct):
# get far-side x-indices plot view
vr = plot.viewRect()
l = vr.left()
r = vr.right()
(
abs_slc,
buf_slc,
iv_arr,
) = self.slice_from_time(
start_t=l,
stop_t=r,
start_t=vr.left(),
stop_t=vr.right(),
timeframe_s=timeframe_s,
return_data=True,
)