129 lines
4.0 KiB
Python
129 lines
4.0 KiB
Python
'''
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Data feed layer APIs, performance, msg throttling.
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'''
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from collections import Counter
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from pprint import pprint
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import pytest
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# import tractor
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import trio
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from piker import (
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open_piker_runtime,
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open_feed,
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)
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from piker.data import ShmArray
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from piker.data._source import (
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unpack_fqsn,
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)
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@pytest.mark.parametrize(
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'fqsns',
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[
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# binance
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(100, {'btcusdt.binance', 'ethusdt.binance'}),
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# kraken
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(20, {'xbteur.kraken', 'xbtusd.kraken'}),
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# binance + kraken
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(200, {'btcusdt.binance', 'xbtusd.kraken'}),
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],
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ids=lambda param: f'quotes={param[0]}@fqsns={param[1]}',
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)
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def test_multi_fqsn_feed(
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fqsns: set[str],
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):
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'''
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Start a real-time data feed for provided fqsn and pull
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a few quotes then simply shut down.
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'''
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max_quotes, fqsns = fqsns
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brokers = set()
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for fqsn in fqsns:
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brokername, key, suffix = unpack_fqsn(fqsn)
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brokers.add(brokername)
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async def main():
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async with (
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open_piker_runtime(
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'test_basic_rt_feed',
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# XXX tractor BUG: this doesn't translate through to the
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# ``tractor._state._runtimevars``...
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# registry_addr=('127.0.0.1', 6666),
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debug_mode=True,
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),
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open_feed(
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fqsns,
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loglevel='info',
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# TODO: ensure throttle rate is applied
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# limit to at least display's FPS
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# avoiding needless Qt-in-guest-mode context switches
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# tick_throttle=_quote_throttle_rate,
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) as feed
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):
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# verify shm buffers exist
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for fqin in fqsns:
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flume = feed.flumes[fqin]
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ohlcv: ShmArray = flume.rt_shm
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hist_ohlcv: ShmArray = flume.hist_shm
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async with feed.open_multi_stream(brokers) as stream:
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# pull the first startup quotes, one for each fqsn, and
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# ensure they match each flume's startup quote value.
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fqsns_copy = fqsns.copy()
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with trio.fail_after(0.5):
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for _ in range(1):
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first_quotes = await stream.receive()
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for fqsn, quote in first_quotes.items():
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# XXX: TODO: WTF apparently this error will get
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# supressed and only show up in the teardown
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# excgroup if we don't have the fix from
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# <tractorbugurl>
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# assert 0
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fqsns_copy.remove(fqsn)
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flume = feed.flumes[fqsn]
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assert quote['last'] == flume.first_quote['last']
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cntr = Counter()
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with trio.fail_after(3):
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async for quotes in stream:
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for fqsn, quote in quotes.items():
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cntr[fqsn] += 1
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# await tractor.breakpoint()
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flume = feed.flumes[fqsn]
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ohlcv: ShmArray = flume.rt_shm
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hist_ohlcv: ShmArray = flume.hist_shm
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# print quote msg, rt and history
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# buffer values on console.
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rt_row = ohlcv.array[-1]
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hist_row = hist_ohlcv.array[-1]
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# last = quote['last']
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# assert last == rt_row['close']
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# assert last == hist_row['close']
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pprint(
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f'{fqsn}: {quote}\n'
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f'rt_ohlc: {rt_row}\n'
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f'hist_ohlc: {hist_row}\n'
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)
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if cntr.total() >= max_quotes:
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break
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assert set(cntr.keys()) == fqsns
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trio.run(main)
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