Variety of IB backend improvements
- Move to new shared mem system only writing on the first (by process) entry to `stream_quotes()`. - Deliver bars before first quote arrives so that chart can populate and then wait for initial arrival. - Allow caching clients per actor. - Load bars using the same (cached) client that starts the quote stream thus speeding up initialization.bar_select
Tyler Goodlet
parent
b1093dc71d
commit
d93ce84a99
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@ -26,8 +26,10 @@ import tractor
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from ..log import get_logger, get_console_log
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from ..data import (
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maybe_spawn_brokerd, iterticks, attach_shared_array,
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incr_buffer,
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maybe_spawn_brokerd,
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iterticks,
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attach_shm_array,
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get_shm_token
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)
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from ..ui._source import from_df
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@ -145,7 +147,7 @@ class Client:
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# durationStr='1 D',
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# time length calcs
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durationStr='{count} S'.format(count=5000 * 5),
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durationStr='{count} S'.format(count=1000 * 5),
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barSizeSetting='5 secs',
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# always use extended hours
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@ -311,6 +313,8 @@ class Client:
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_tws_port: int = 7497
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_gw_port: int = 4002
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_try_ports = [_tws_port, _gw_port]
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_client_ids = itertools.count()
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_client_cache = {}
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@asynccontextmanager
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@ -321,17 +325,18 @@ async def _aio_get_client(
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) -> Client:
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"""Return an ``ib_insync.IB`` instance wrapped in our client API.
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"""
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# first check cache for existing client
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try:
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yield _client_cache[(host, port)]
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except KeyError:
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# TODO: in case the arbiter has no record
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# of existing brokerd we need to broadcast for one.
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if client_id is None:
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# if this is a persistent brokerd, try to allocate a new id for
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# each client
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try:
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ss = tractor.current_actor().statespace
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client_id = next(ss.setdefault('client_ids', itertools.count()))
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# TODO: in case the arbiter has no record
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# of existing brokerd we need to broadcase for one.
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except RuntimeError:
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# tractor likely isn't running
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client_id = 1
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client_id = next(_client_ids)
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ib = NonShittyIB()
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ports = _try_ports if port is None else [port]
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@ -347,7 +352,9 @@ async def _aio_get_client(
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raise ConnectionRefusedError(_err)
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try:
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yield Client(ib)
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client = Client(ib)
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_client_cache[(host, port)] = client
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yield client
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except BaseException:
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ib.disconnect()
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raise
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@ -489,7 +496,7 @@ def normalize(
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# @tractor.msg.pub
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async def stream_quotes(
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symbols: List[str],
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shared_array_token: Tuple[str, str],
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shm_token: Tuple[str, str, List[tuple]],
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loglevel: str = None,
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# compat for @tractor.msg.pub
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topics: Any = None,
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@ -506,16 +513,35 @@ async def stream_quotes(
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# TODO: support multiple subscriptions
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sym = symbols[0]
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stream = await tractor.to_asyncio.run_task(
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_trio_run_client_method,
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stream = await _trio_run_client_method(
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method='stream_ticker',
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symbol=sym,
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)
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async with get_client() as client:
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bars = await client.bars(symbol=sym)
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async with aclosing(stream):
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# maybe load historical ohlcv in to shared mem
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# check if shm has already been created by previous
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# feed initialization
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writer_exists = get_shm_token(shm_token['shm_name'])
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if not writer_exists:
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shm = attach_shm_array(
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token=shm_token,
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# we are writer
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readonly=False,
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)
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bars = await _trio_run_client_method(
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method='bars',
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symbol=sym,
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)
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shm.push(bars)
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shm_token = shm.token
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# pass back token, and bool, signalling if we're the writer
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yield shm_token, not writer_exists
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# first quote can be ignored as a 2nd with newer data is sent?
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first_ticker = await stream.__anext__()
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quote = normalize(first_ticker)
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@ -538,7 +564,7 @@ async def stream_quotes(
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else:
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log.debug("Received first real volume tick")
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# ugh, clear ticks since we've consumed them
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# (ahem, ib_insync is stateful trash)
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# (ahem, ib_insync is truly stateful trash)
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ticker.ticks = []
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# XXX: this works because we don't use
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@ -555,27 +581,8 @@ async def stream_quotes(
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topic = '.'.join((con['symbol'], con[suffix])).lower()
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first_quote = {topic: quote}
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ticker.ticks = []
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# load historical ohlcv in to shared mem
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ss = tractor.current_actor().statespace
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existing_shm = ss.get(f'ib_shm.{sym}')
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if not existing_shm:
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readonly = False
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else:
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readonly = True
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shm = existing_shm
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with attach_shared_array(
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token=shared_array_token,
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readonly=readonly
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) as shm:
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if not existing_shm:
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shm.push(bars)
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ss[f'ib_shm.{sym}'] = shm
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yield (first_quote, shm.token)
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else:
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yield (first_quote, None)
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# yield first quote asap
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yield first_quote
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async for ticker in stream:
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quote = normalize(
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@ -589,8 +596,9 @@ async def stream_quotes(
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# at the yield such that the array write isn't delayed
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# while another consumer is serviced..
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# if we are the lone tick writer
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if not existing_shm:
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# if we are the lone tick writer start writing
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# the buffer with appropriate trade data
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if not writer_exists:
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for tick in iterticks(quote, type='trade'):
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last = tick['price']
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# print(f'broker last: {tick}')
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