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Poll for sampling info at startup, tolerate races 

Use the new `Feed.get_ds_info()` method in a poll loop to definitively
get the inter-chart sampling info and avoid races with shm buffer
backfilling.

Also, factor the history increment closure-task into
`graphics_update_loop()` which will make it clearer how to factor
all the "should we update" logic into some `DisplayState` API.
history_view
Tyler Goodlet 2022-09-01 16:25:54 -04:00
parent 2ef6460853
commit 31735f26d3
1 changed files with 78 additions and 74 deletions
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152
piker/ui/_display.py
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@ -26,14 +26,15 @@ from functools import partial
import time
from typing import Optional, Any, Callable
import numpy as np
import tractor
import trio
import pendulum
import pyqtgraph as pg
# from .. import brokers
from ..data.feed import open_feed
from ..data.feed import (
open_feed,
Feed,
)
from ._axes import YAxisLabel
from ._chart import (
ChartPlotWidget,
@ -153,11 +154,9 @@ class DisplayState:
async def graphics_update_loop(
linked: LinkedSplits,
stream: tractor.MsgStream,
ohlcv: np.ndarray,
hist_ohlcv: np.ndarray,
nurse: trio.Nursery,
godwidget: GodWidget,
feed: Feed,
wap_in_history: bool = False,
vlm_chart: Optional[ChartPlotWidget] = None,
@ -178,10 +177,14 @@ async def graphics_update_loop(
# of copying it from last bar's close
# - 1-5 sec bar lookback-autocorrection like tws does?
# (would require a background history checker task)
godwidget = linked.godwidget
linked: LinkedSplits = godwidget.rt_linked
display_rate = godwidget.window.current_screen().refreshRate()
chart = linked.chart
hist_chart = godwidget.hist_linked.chart
ohlcv = feed.rt_shm
hist_ohlcv = feed.hist_shm
# update last price sticky
last_price_sticky = chart._ysticks[chart.name]
@ -257,7 +260,44 @@ async def graphics_update_loop(
chart.default_view()
# TODO: probably factor this into some kinda `DisplayState`
# API that can be reused at least in terms of pulling view
# params (eg ``.bars_range()``).
async def increment_history_view():
i_last_append = i_last = hist_ohlcv.index
_, hist_step_size_s, _ = feed.get_ds_info()
async with feed.index_stream(
int(hist_step_size_s)
) as istream:
async for msg in istream:
# increment the view position by the sample offset.
uppx = hist_chart.view.x_uppx()
l, lbar, rbar, r = hist_chart.bars_range()
i_step = hist_ohlcv.index
i_diff = i_step - i_last
i_last = i_step
liv = r >= i_step
append_diff = i_step - i_last_append
do_append = (append_diff >= uppx)
if do_append:
i_last_append = i_step
if (
# i_diff > 0 # no new sample step
do_append
# and uppx < 4 # chart is zoomed out very far
and liv
):
hist_chart.increment_view(steps=i_diff)
nurse.start_soon(increment_history_view)
# main real-time quotes update loop
stream: tractor.MsgStream = feed.stream
async for quotes in stream:
ds.quotes = quotes
@ -736,27 +776,13 @@ async def display_symbol_data(
ohlcv: ShmArray = feed.rt_shm
hist_ohlcv: ShmArray = feed.hist_shm
times = hist_ohlcv.array['time']
end = pendulum.from_timestamp(times[-1])
start = pendulum.from_timestamp(times[times != times[-1]][-1])
hist_step_size_s = (end - start).seconds
times = ohlcv.array['time']
end = pendulum.from_timestamp(times[-1])
start = pendulum.from_timestamp(times[times != times[-1]][-1])
rt_step_size_s = (end - start).seconds
ratio = hist_step_size_s / rt_step_size_s
# this value needs to be pulled once and only once during
# startup
end_index = feed.startup_hist_index
# bars = ohlcv.array
symbol = feed.symbols[sym]
fqsn = symbol.front_fqsn()
step_size_s = 1
tf_key = tf_in_1s[step_size_s]
@ -767,8 +793,8 @@ async def display_symbol_data(
f'step:{tf_key} '
)
linked = godwidget.rt_linked
linked._symbol = symbol
rt_linked = godwidget.rt_linked
rt_linked._symbol = symbol
# generate order mode side-pane UI
# A ``FieldsForm`` form to configure order entry
@ -793,7 +819,7 @@ async def display_symbol_data(
)
# create main OHLC chart
chart = linked.plot_ohlc_main(
chart = rt_linked.plot_ohlc_main(
symbol,
ohlcv,
# in the case of history chart we explicitly set `False`
@ -801,7 +827,6 @@ async def display_symbol_data(
sidepane=pp_pane,
)
# chart.default_view()
chart._feeds[symbol.key] = feed
chart.setFocus()
@ -837,6 +862,18 @@ async def display_symbol_data(
# a weird placement of the region on the way-far-left..
# region.setClipItem(flow.graphics)
# poll for datums load and timestep detection
for _ in range(10):
try:
_, _, ratio = feed.get_ds_info()
break
except IndexError:
await trio.sleep(0.001)
continue
else:
raise RuntimeError(
'Failed to detect sampling periods from shm!?')
def update_pi_from_region():
region.setZValue(10)
mn, mx = region.getRegion()
@ -877,14 +914,14 @@ async def display_symbol_data(
# NOTE: we must immediately tell Qt to show the OHLC chart
# to avoid a race where the subplots get added/shown to
# the linked set *before* the main price chart!
linked.show()
linked.focus()
rt_linked.show()
rt_linked.focus()
await trio.sleep(0)
linked.splitter.insertWidget(0, hist_linked)
rt_linked.splitter.insertWidget(0, hist_linked)
# XXX: if we wanted it at the bottom?
# linked.splitter.addWidget(hist_linked)
linked.focus()
# rt_linked.splitter.addWidget(hist_linked)
rt_linked.focus()
vlm_chart: Optional[ChartPlotWidget] = None
async with trio.open_nursery() as ln:
@ -896,7 +933,7 @@ async def display_symbol_data(
):
vlm_chart = await ln.start(
open_vlm_displays,
linked,
rt_linked,
ohlcv,
)
@ -904,7 +941,7 @@ async def display_symbol_data(
# from an input config.
ln.start_soon(
start_fsp_displays,
linked,
rt_linked,
ohlcv,
loading_sym_key,
loglevel,
@ -913,46 +950,13 @@ async def display_symbol_data(
# start graphics update loop after receiving first live quote
ln.start_soon(
graphics_update_loop,
linked,
feed.stream,
ohlcv,
hist_ohlcv,
ln,
godwidget,
feed,
wap_in_history,
vlm_chart,
)
async def increment_history_view():
i_last_append = i_last = hist_ohlcv.index
async with feed.index_stream(
int(hist_step_size_s)
) as istream:
async for msg in istream:
# increment the view position by the sample offset.
uppx = hist_chart.view.x_uppx()
l, lbar, rbar, r = hist_chart.bars_range()
i_step = hist_ohlcv.index
i_diff = i_step - i_last
i_last = i_step
liv = r >= i_step
append_diff = i_step - i_last_append
do_append = (append_diff >= uppx)
if do_append:
i_last_append = i_step
if (
# i_diff > 0 # no new sample step
do_append
# and uppx < 4 # chart is zoomed out very far
and liv
):
hist_chart.increment_view(steps=i_diff)
ln.start_soon(increment_history_view)
await trio.sleep(0)
# size view to data prior to order mode init
@ -973,19 +977,19 @@ async def display_symbol_data(
# let Qt run to render all widgets and make sure the
# sidepanes line up vertically.
await trio.sleep(0)
linked.resize_sidepanes()
linked.set_split_sizes()
rt_linked.resize_sidepanes()
rt_linked.set_split_sizes()
# NOTE: we pop the volume chart from the subplots set so
# that it isn't double rendered in the display loop
# above since we do a maxmin calc on the volume data to
# determine if auto-range adjustements should be made.
# linked.subplots.pop('volume', None)
# rt_linked.subplots.pop('volume', None)
# TODO: make this not so shit XD
# close group status
sbar._status_groups[loading_sym_key][1]()
# let the app run.. bby
# linked.graphics_cycle()
# rt_linked.graphics_cycle()
await trio.sleep_forever()