Port to the new `@tractor.msg.pub` decorator API
The pub-sub data feed system was factored into `tractor` as an experimental api / subsystem. Move to using that which greatly simplifies the data feed architecture.kivy_mainline_and_py3.8
Tyler Goodlet
parent
22670afe58
commit
2514843fc1
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@ -44,10 +44,38 @@ async def wait_for_network(net_func: Callable, sleep: int = 1) -> dict:
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await trio.sleep(sleep)
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# TODO: at this point probably just just make this a class and
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# a lot of these functions should be methods. It will definitely
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# make stateful UI apps easier to implement
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@dataclass
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class BrokerFeed:
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"""A per broker "client feed" container.
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A structure to keep track of components used by
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real-time data daemons. This is a backend "client" which pulls
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data from broker specific data lakes:
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``DataFeed`` <- tractor -> ``BrokerFeed`` <- broker IPC -> broker API
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"""
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mod: ModuleType
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client: object
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exit_stack: contextlib.AsyncExitStack
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quoter_keys: Tuple[str] = ('stock', 'option')
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locks: Dict[str, trio.StrictFIFOLock] = field(
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default_factory=lambda:
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{'stock': trio.StrictFIFOLock(), 'option': trio.StrictFIFOLock()}
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)
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quoters: Dict[str, typing.Coroutine] = field(default_factory=dict)
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subscriptions: Dict[str, Dict[str, set]] = field(
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default_factory=partial(dict, **{'option': {}, 'stock': {}})
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)
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@tractor.msg.pub(tasks=['stock', 'option'])
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async def stream_quotes(
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get_topics: typing.Callable,
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get_quotes: Coroutine,
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brokermod: ModuleType,
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feed: BrokerFeed,
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rate: int = 5, # delay between quote requests
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diff_cached: bool = True, # only deliver "new" quotes to the queue
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) -> None:
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@ -57,6 +85,11 @@ async def stream_quotes(
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A stock-broker client ``get_quotes()`` async context manager must be
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provided which returns an async quote retrieval function.
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"""
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broker_limit = getattr(feed.mod, '_rate_limit', float('inf'))
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if broker_limit < rate:
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rate = broker_limit
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log.warn(f"Limiting {feed.mod.__name__} query rate to {rate}/sec")
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sleeptime = round(1. / rate, 3)
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_cache = {} # ticker to quote caching
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@ -94,11 +127,11 @@ async def stream_quotes(
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log.info(
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f"New quote {quote['symbol']}:\n{new}")
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_cache[symbol] = quote
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new_quotes[symbol] = quote
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new_quotes[quote['key']] = quote
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else:
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log.info(f"Delivering quotes:\n{quotes}")
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for quote in quotes:
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newquotes[quote['symbol']] = quote
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new_quotes[quote['symbol']] = quote
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yield new_quotes
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@ -117,90 +150,6 @@ async def stream_quotes(
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await trio.sleep(delay)
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# TODO: at this point probably just just make this a class and
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# a lot of these functions should be methods. It will definitely
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# make stateful UI apps easier to implement
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@dataclass
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class BrokerFeed:
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"""A per broker "client feed" container.
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A structure to keep track of components used by
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real-time data daemons. This is a backend "client" which pulls
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data from broker specific data lakes:
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``DataFeed`` <- tractor -> ``BrokerFeed`` <- broker IPC -> broker API
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"""
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mod: ModuleType
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client: object
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exit_stack: contextlib.AsyncExitStack
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quoter_keys: Tuple[str] = ('stock', 'option')
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locks: Dict[str, trio.StrictFIFOLock] = field(
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default_factory=lambda:
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{'stock': trio.StrictFIFOLock(), 'option': trio.StrictFIFOLock()}
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)
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quoters: Dict[str, typing.Coroutine] = field(default_factory=dict)
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subscriptions: Dict[str, Dict[str, set]] = field(
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default_factory=partial(dict, **{'option': {}, 'stock': {}})
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)
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async def fan_out_to_ctxs(
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pub_gen: typing.AsyncGenerator,
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feed: BrokerFeed,
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get_quotes: Coroutine,
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topics2ctxs: Dict[str, tractor.Context],
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topic_key: str = 'key',
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packet_key: str = 'symbol',
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rate: int = 5, # delay between quote requests
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diff_cached: bool = True, # only deliver "new" quotes to the queue
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) -> None:
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"""Request and fan out quotes to each subscribed actor channel.
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"""
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broker_limit = getattr(feed.mod, '_rate_limit', float('inf'))
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if broker_limit < rate:
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rate = broker_limit
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log.warn(f"Limiting {feed.mod.__name__} query rate to {rate}/sec")
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def get_topics():
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return tuple(topics2ctxs.keys())
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async for published in pub_gen(
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get_topics,
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get_quotes,
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feed.mod,
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rate,
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diff_cached=diff_cached,
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):
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ctx_payloads = {}
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for packet_key, data in published.items():
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# grab each suscription topic using provided key for lookup
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topic = data[topic_key]
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# build a new dict packet for passing to multiple underlying channels
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packet = {packet_key: data}
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for ctx in topics2ctxs.get(topic, set()):
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ctx_payloads.setdefault(ctx, {}).update(packet),
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# deliver to each subscriber (fan out)
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if ctx_payloads:
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for ctx, payload in ctx_payloads.items():
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try:
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await ctx.send_yield(payload)
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except (
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# That's right, anything you can think of...
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trio.ClosedStreamError, ConnectionResetError,
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ConnectionRefusedError,
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):
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log.warn(f"{ctx.chan} went down?")
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for ctx_set in topics2ctxs.values():
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ctx_set.discard(ctx)
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if not any(topics2ctxs.values()):
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log.warn(f"No subs left for broker {feed.mod.name}, exiting task")
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break
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log.info(f"Terminating stream quoter task for {pub_gen.__name__}")
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async def symbol_data(broker: str, tickers: List[str]):
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"""Retrieve baseline symbol info from broker.
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"""
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@ -255,38 +204,6 @@ async def smoke_quote(get_quotes, tickers, broker):
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###########################################
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def modify_quote_stream(broker, feed_type, symbols, ctx):
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"""Absolute symbol subscription list for each quote stream.
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Effectively a symbol subscription api.
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"""
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log.info(f"{ctx.chan} changed symbol subscription to {symbols}")
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ss = tractor.current_actor().statespace
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feed = ss['feeds'].get(broker)
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if feed is None:
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raise RuntimeError(
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"`get_cached_feed()` must be called before modifying its stream"
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)
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symbols2ctxs = feed.subscriptions[feed_type]
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# update map from each symbol to requesting client's chan
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for ticker in symbols:
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symbols2ctxs.setdefault(ticker, set()).add(ctx)
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# remove any existing symbol subscriptions if symbol is not
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# found in ``symbols``
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# TODO: this can likely be factored out into the pub-sub api
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for ticker in filter(
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lambda ticker: ticker not in symbols, symbols2ctxs.copy()
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):
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ctx_set = symbols2ctxs.get(ticker)
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ctx_set.discard(ctx)
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if not ctx_set:
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# pop empty sets which will trigger bg quoter task termination
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symbols2ctxs.pop(ticker)
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async def get_cached_feed(
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brokername: str,
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) -> BrokerFeed:
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@ -317,11 +234,11 @@ async def get_cached_feed(
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async def start_quote_stream(
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ctx: tractor.Context, # marks this as a streaming func
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broker: str,
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symbols: List[Any],
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feed_type: str = 'stock',
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diff_cached: bool = True,
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ctx: tractor.Context = None,
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rate: int = 3,
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) -> None:
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"""Handle per-broker quote stream subscriptions using a "lazy" pub-sub
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@ -341,7 +258,7 @@ async def start_quote_stream(
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# another actor task may have already created it
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feed = await get_cached_feed(broker)
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symbols2ctxs = feed.subscriptions[feed_type]
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task_is_dead = None
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packetizer = None
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if feed_type == 'stock':
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get_quotes = feed.quoters.setdefault(
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@ -351,8 +268,7 @@ async def start_quote_stream(
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# do a smoke quote (note this mutates the input list and filters
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# out bad symbols for now)
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payload = await smoke_quote(get_quotes, symbols, broker)
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# push initial smoke quote response for client initialization
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await ctx.send_yield(payload)
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elif feed_type == 'option':
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# FIXME: yeah we need maybe a more general way to specify
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# the arg signature for the option feed beasides a symbol
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@ -361,46 +277,36 @@ async def start_quote_stream(
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'option',
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await feed.mod.option_quoter(feed.client, symbols)
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)
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# packetize
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payload = {
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quote['symbol']: quote
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for quote in await get_quotes(symbols)
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}
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def packetizer(topic, quote):
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return {quote['symbol']: quote}
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# push initial smoke quote response for client initialization
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await ctx.send_yield(payload)
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try:
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# update map from each symbol to requesting client's chan
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modify_quote_stream(broker, feed_type, symbols, ctx)
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# prevents more then one broker feed task from spawning
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lock = feed.locks.get(feed_type)
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# block and let existing feed task deliver
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# stream data until it is cancelled in which case
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# we'll take over and spawn it again
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async with lock:
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# no data feeder task yet; so start one
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respawn = True
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while respawn:
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respawn = False
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log.info(f"Spawning data feed task for {feed.mod.name}")
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try:
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# unblocks when no more symbols subscriptions exist and the
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# quote streamer task terminates
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await fan_out_to_ctxs(
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stream_quotes,
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feed,
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get_quotes,
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symbols2ctxs,
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await stream_quotes(
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# pub required kwargs
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task_name=feed_type,
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ctx=ctx,
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topics=symbols,
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packetizer=packetizer,
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# actual func args
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feed=feed,
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get_quotes=get_quotes,
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diff_cached=diff_cached,
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rate=rate,
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)
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except trio.BrokenResourceError:
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log.exception("Respawning failed data feed task")
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respawn = True
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log.info(
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f"Terminating stream quoter task for {feed.mod.name}")
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finally:
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# if we're cancelled externally unsubscribe our quote feed
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modify_quote_stream(broker, feed_type, [], ctx)
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# if there are truly no more subscriptions with this broker
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# drop from broker subs dict
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if not any(symbols2ctxs.values()):
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