79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
"""
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Actor discovery API.
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"""
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import typing
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from typing import Tuple, Optional, Union
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from async_generator import asynccontextmanager
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from ._ipc import _connect_chan, Channel
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from ._portal import (
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Portal,
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open_portal,
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LocalPortal,
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)
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from ._state import current_actor
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@asynccontextmanager
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async def get_arbiter(
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host: str,
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port: int,
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) -> typing.AsyncGenerator[Union[Portal, LocalPortal], None]:
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"""Return a portal instance connected to a local or remote
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arbiter.
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"""
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actor = current_actor()
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if not actor:
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raise RuntimeError("No actor instance has been defined yet?")
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if actor.is_arbiter:
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# we're already the arbiter
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# (likely a re-entrant call from the arbiter actor)
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yield LocalPortal(actor, Channel((host, port)))
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else:
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async with _connect_chan(host, port) as chan:
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async with open_portal(chan) as arb_portal:
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yield arb_portal
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@asynccontextmanager
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async def find_actor(
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name: str, arbiter_sockaddr: Tuple[str, int] = None
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) -> typing.AsyncGenerator[Optional[Portal], None]:
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"""Ask the arbiter to find actor(s) by name.
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Returns a connected portal to the last registered matching actor
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known to the arbiter.
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"""
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actor = current_actor()
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async with get_arbiter(*arbiter_sockaddr or actor._arb_addr) as arb_portal:
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sockaddr = await arb_portal.run('self', 'find_actor', name=name)
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# TODO: return portals to all available actors - for now just
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# the last one that registered
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if name == 'arbiter' and actor.is_arbiter:
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raise RuntimeError("The current actor is the arbiter")
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elif sockaddr:
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async with _connect_chan(*sockaddr) as chan:
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async with open_portal(chan) as portal:
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yield portal
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else:
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yield None
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@asynccontextmanager
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async def wait_for_actor(
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name: str,
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arbiter_sockaddr: Tuple[str, int] = None
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) -> typing.AsyncGenerator[Portal, None]:
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"""Wait on an actor to register with the arbiter.
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A portal to the first registered actor is returned.
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"""
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actor = current_actor()
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async with get_arbiter(*arbiter_sockaddr or actor._arb_addr) as arb_portal:
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sockaddrs = await arb_portal.run('self', 'wait_for_actor', name=name)
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sockaddr = sockaddrs[-1]
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async with _connect_chan(*sockaddr) as chan:
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async with open_portal(chan) as portal:
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yield portal
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