Drop `trimeter`-ized concurrent history querying
It doesn't seem to be any slower on our least throttled backend (binance) and it removes a bunch of hard to get correct frame re-ordering logic that i'm not sure really ever fully worked XD Commented some issues we still need to resolve as well.clears_table_events
Tyler Goodlet
parent
c939e75ef9
commit
d5c3124722
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@ -21,18 +21,19 @@ This module is enabled for ``brokerd`` daemons.
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"""
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from __future__ import annotations
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from dataclasses import dataclass, field
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from datetime import datetime
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from contextlib import asynccontextmanager
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from dataclasses import (
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dataclass,
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field,
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)
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from datetime import datetime
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from functools import partial
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from pprint import pformat
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from types import ModuleType
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from typing import (
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Any,
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AsyncIterator,
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Callable,
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Optional,
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Generator,
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Awaitable,
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TYPE_CHECKING,
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Union,
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@ -41,7 +42,6 @@ from typing import (
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import trio
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from trio.abc import ReceiveChannel
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from trio_typing import TaskStatus
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import trimeter
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import tractor
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from tractor.trionics import maybe_open_context
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import pendulum
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@ -300,6 +300,9 @@ async def start_backfill(
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log.info(f'Pushing {to_push.size} to shm!')
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shm.push(to_push)
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# TODO: *** THIS IS A BUG ***
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# we need to only broadcast to subscribers for this fqsn..
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# otherwise all fsps get reset on every chart..
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for delay_s in sampler.subscribers:
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await broadcast(delay_s)
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@ -337,79 +340,31 @@ async def start_backfill(
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last_tsdb_dt = start_dt.subtract(**kwargs)
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# configure async query throttling
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erlangs = config.get('erlangs', 1)
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rate = config.get('rate', 1)
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frames = {}
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# rate = config.get('rate', 1)
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# XXX: legacy from ``trimeter`` code but unsupported now.
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# erlangs = config.get('erlangs', 1)
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def iter_dts(start: datetime):
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# inline sequential loop where we simply pass the
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# last retrieved start dt to the next request as
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# it's end dt.
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starts: set[datetime] = set()
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while True:
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hist_period = pendulum.period(
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start,
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last_tsdb_dt,
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)
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dtrange = list(hist_period.range('seconds', frame_size_s))
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log.debug(f'New datetime index:\n{pformat(dtrange)}')
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for end_dt in dtrange:
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log.info(f'Yielding next frame start {end_dt}')
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start = yield end_dt
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# if caller sends a new start date, reset to that
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if start is not None:
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log.warning(f'Resetting date range: {start}')
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break
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else:
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# from while
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return
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# pull new history frames until we hit latest
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# already in the tsdb or a max count.
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count = 0
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# NOTE: when gaps are detected in the retreived history (by
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# comparisor of the end - start versus the expected "frame size"
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# in seconds) we need a way to alert the async request code not
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# to continue to query for data "within the gap". This var is
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# set in such cases such that further requests in that period
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# are discarded and further we reset the "datetimem query frame
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# index" in such cases to avoid needless noop requests.
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earliest_end_dt: Optional[datetime] = start_dt
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async def get_ohlc_frame(
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input_end_dt: datetime,
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iter_dts_gen: Generator[datetime],
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) -> np.ndarray:
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nonlocal count, frames, earliest_end_dt, frame_size_s
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count += 1
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if input_end_dt > earliest_end_dt:
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# if a request comes in for an inter-gap frame we
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# discard it since likely this request is still
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# lingering from before the reset of ``iter_dts()`` via
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# ``.send()`` below.
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log.info(f'Discarding request history ending @ {input_end_dt}')
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# signals to ``trimeter`` loop to discard and
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# ``continue`` in it's schedule loop.
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return None
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while start_dt > last_tsdb_dt:
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print(f"QUERY end_dt={start_dt}")
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try:
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log.info(
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f'Requesting {step_size_s}s frame ending in {input_end_dt}'
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f'Requesting {step_size_s}s frame ending in {start_dt}'
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)
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array, start_dt, end_dt = await hist(
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timeframe,
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end_dt=input_end_dt,
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end_dt=start_dt,
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)
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assert array['time'][0] == start_dt.timestamp()
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except NoData:
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log.warning(
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f'NO DATA for {frame_size_s}s frame @ {input_end_dt} ?!?'
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f'NO DATA for {frame_size_s}s frame @ {start_dt} ?!?'
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)
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return None # discard signal
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@ -433,41 +388,27 @@ async def start_backfill(
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# XXX: query result includes a start point prior to our
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# expected "frame size" and thus is likely some kind of
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# history gap (eg. market closed period, outage, etc.)
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# so indicate to the request loop that this gap is
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# expected by both,
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# - resetting the ``iter_dts()`` generator to start at
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# the new start point delivered in this result
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# - setting the non-locally scoped ``earliest_end_dt``
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# to this new value so that the request loop doesn't
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# get tripped up thinking there's an out of order
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# request-result condition.
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# so just report it to console for now.
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log.warning(
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f'History frame ending @ {end_dt} appears to have a gap:\n'
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f'{diff} ~= {frame_time_diff_s} seconds'
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)
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# reset dtrange gen to new start point
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try:
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next_end = iter_dts_gen.send(start_dt)
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log.info(
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f'Reset frame index to start at {start_dt}\n'
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f'Was at {next_end}'
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)
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array, _start_dt, end_dt = await hist(
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timeframe,
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end_dt=start_dt,
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)
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# NOTE: manually set "earliest end datetime" index-value
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# to avoid the request loop getting confused about
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# new frames that are earlier in history - i.e. this
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# **is not** the case of out-of-order frames from
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# an async batch request.
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earliest_end_dt = start_dt
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if (
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_start_dt in starts
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):
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print("SKIPPING DUPLICATE FRAME @ {_start_dt}")
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start_dt = min(starts)
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continue
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except StopIteration:
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# gen already terminated meaning we probably already
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# exhausted it via frame requests.
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log.info(
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"Datetime index already exhausted, can't reset.."
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)
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# only update new start point if new
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start_dt = _start_dt
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starts.add(start_dt)
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to_push = diff_history(
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array,
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@ -478,195 +419,53 @@ async def start_backfill(
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ln = len(to_push)
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if ln:
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log.info(f'{ln} bars for {start_dt} -> {end_dt}')
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frames[input_end_dt.timestamp()] = (to_push, start_dt, end_dt)
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return to_push, start_dt, end_dt
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else:
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log.warning(
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f'{ln} BARS TO PUSH after diff?!: {start_dt} -> {end_dt}'
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)
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return None
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# initial dt index starts at the start of the first query result
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idts = iter_dts(start_dt)
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# bail gracefully on shm allocation overrun/full condition
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try:
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shm.push(to_push, prepend=True)
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except ValueError:
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log.info(
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f'Shm buffer overrun on: {start_dt} -> {end_dt}?'
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)
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break
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async with trimeter.amap(
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partial(
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get_ohlc_frame,
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# we close in the ``iter_dt()`` gen in so we can send
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# reset signals as needed for gap dection in the
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# history.
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iter_dts_gen=idts,
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),
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idts,
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log.info(
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f'Shm pushed {ln} frame:\n'
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f'{start_dt} -> {end_dt}'
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)
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capture_outcome=True,
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include_value=True,
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if (
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storage is not None
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and write_tsdb
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):
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log.info(
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f'Writing {ln} frame to storage:\n'
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f'{start_dt} -> {end_dt}'
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)
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await storage.write_ohlcv(
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f'{bfqsn}.{mod.name}', # lul..
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to_push,
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timeframe,
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)
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# better technical names bruv...
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max_at_once=erlangs,
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max_per_second=rate,
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# TODO: can we only trigger this if the respective
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# history in "in view"?!?
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) as outcomes:
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# Then iterate over the return values, as they become available
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# (i.e., not necessarily in the original order)
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async for input_end_dt, outcome in outcomes:
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try:
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out = outcome.unwrap()
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if out is None:
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# skip signal
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continue
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elif isinstance(out, DataUnavailable):
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# no data available case signal.. so just kill
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# further requests and basically just stop
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# trying...
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break
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except Exception:
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log.exception('uhh trimeter bail')
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raise
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else:
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to_push, start_dt, end_dt = out
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if not len(to_push):
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# diff returned no new data (i.e. we probablyl hit
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# the ``last_tsdb_dt`` point).
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# TODO: raise instead?
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log.warning(f'No history for range {start_dt} -> {end_dt}')
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continue
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# pipeline-style pull frames until we need to wait for
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# the next in order to arrive.
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# i = end_dts.index(input_end_dt)
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# print(f'latest end_dt {end_dt} found at index {i}')
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epochs = list(reversed(sorted(frames)))
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for epoch in epochs:
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start = shm.array['time'][0]
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last_shm_prepend_dt = pendulum.from_timestamp(start)
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earliest_frame_queue_dt = pendulum.from_timestamp(epoch)
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diff = start - epoch
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if diff < 0:
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log.warning(
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'Discarding out of order frame:\n'
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f'{earliest_frame_queue_dt}'
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)
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frames.pop(epoch)
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continue
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if diff > step_size_s:
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if earliest_end_dt < earliest_frame_queue_dt:
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# XXX: an expected gap was encountered (see
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# logic in ``get_ohlc_frame()``, so allow
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# this frame through to the storage layer.
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log.warning(
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f'Expected history gap of {diff}s:\n'
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f'{earliest_frame_queue_dt} <- '
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f'{earliest_end_dt}'
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)
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elif (
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erlangs > 1
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):
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# we don't yet have the next frame to push
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# so break back to the async request loop
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# while we wait for more async frame-results
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# to arrive.
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if len(frames) >= erlangs:
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log.warning(
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'Frame count in async-queue is greater '
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'then erlangs?\n'
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'There seems to be a gap between:\n'
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f'{earliest_frame_queue_dt} <- '
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f'{last_shm_prepend_dt}\n'
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'Conducting manual call for frame ending: '
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f'{last_shm_prepend_dt}'
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)
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(
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to_push,
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start_dt,
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end_dt,
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) = await get_ohlc_frame(
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input_end_dt=last_shm_prepend_dt,
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iter_dts_gen=idts,
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)
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last_epoch = to_push['time'][-1]
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diff = start - last_epoch
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if diff > step_size_s:
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await tractor.breakpoint()
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raise DataUnavailable(
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'An awkward frame was found:\n'
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f'{start_dt} -> {end_dt}:\n{to_push}'
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)
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else:
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frames[last_epoch] = (
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to_push, start_dt, end_dt)
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break
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expect_end = pendulum.from_timestamp(start)
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expect_start = expect_end.subtract(
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seconds=frame_size_s)
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log.warning(
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'waiting on out-of-order history frame:\n'
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f'{expect_end - expect_start}'
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)
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break
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to_push, start_dt, end_dt = frames.pop(epoch)
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ln = len(to_push)
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# bail gracefully on shm allocation overrun/full condition
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try:
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shm.push(to_push, prepend=True)
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except ValueError:
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log.info(
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f'Shm buffer overrun on: {start_dt} -> {end_dt}?'
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)
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break
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log.info(
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f'Shm pushed {ln} frame:\n'
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f'{start_dt} -> {end_dt}'
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)
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# keep track of most recent "prepended" ``start_dt``
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# both for detecting gaps and ensuring async
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# frame-result order.
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earliest_end_dt = start_dt
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if (
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storage is not None
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and write_tsdb
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):
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log.info(
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f'Writing {ln} frame to storage:\n'
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f'{start_dt} -> {end_dt}'
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)
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await storage.write_ohlcv(
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f'{bfqsn}.{mod.name}', # lul..
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to_push,
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timeframe,
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)
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# TODO: can we only trigger this if the respective
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# history in "in view"?!?
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# XXX: extremely important, there can be no checkpoints
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# in the block above to avoid entering new ``frames``
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# values while we're pipelining the current ones to
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# memory...
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for delay_s in sampler.subscribers:
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await broadcast(delay_s)
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# XXX: extremely important, there can be no checkpoints
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# in the block above to avoid entering new ``frames``
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# values while we're pipelining the current ones to
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# memory...
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for delay_s in sampler.subscribers:
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await broadcast(delay_s)
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# short-circuit (for now)
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bf_done.set()
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return
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async def manage_history(
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@ -789,7 +588,6 @@ async def manage_history(
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else:
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dt_diff_s = 0
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# await trio.sleep_forever()
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# TODO: see if there's faster multi-field reads:
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# https://numpy.org/doc/stable/user/basics.rec.html#accessing-multiple-fields
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# re-index with a `time` and index field
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