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tractor/tests/test_tractor.py

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"""
Actor model API testing
"""
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import time
from functools import partial
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import pytest
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import trio
from piker import tractor
@pytest.fixture
def us_symbols():
return ['TSLA', 'AAPL', 'CGC', 'CRON']
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@pytest.mark.trio
async def test_no_arbitter():
"""An arbitter must be established before any nurseries
can be created.
(In other words ``tractor.run`` must be used instead of ``trio.run`` as is
done by the ``pytest-trio`` plugin.)
"""
with pytest.raises(RuntimeError):
with tractor.open_nursery():
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pass
def test_local_actor_async_func():
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"""Verify a simple async function in-process.
"""
nums = []
async def print_loop():
# arbiter is started in-proc if dne
assert tractor.current_actor().is_arbiter
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for i in range(10):
nums.append(i)
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await trio.sleep(0.1)
start = time.time()
tractor.run(print_loop)
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# ensure the sleeps were actually awaited
assert time.time() - start >= 1
assert nums == list(range(10))
# NOTE: this func must be defined at module level in order for the
# interal pickling infra of the forkserver to work
async def spawn(is_arbiter):
statespace = {'doggy': 10, 'kitty': 4}
namespaces = ['piker.brokers.core']
await trio.sleep(0.1)
actor = tractor.current_actor()
assert actor.is_arbiter == is_arbiter
# arbiter should always have an empty statespace as it's redundant
assert actor.statespace == statespace
if actor.is_arbiter:
async with tractor.open_nursery() as nursery:
# forks here
portal = await nursery.start_actor(
'sub-actor',
main=partial(spawn, False),
statespace=statespace,
rpc_module_paths=namespaces,
)
assert len(nursery._children) == 1
assert portal.channel.uid in tractor.current_actor()._peers
else:
return 10
def test_local_arbiter_subactor_global_state():
statespace = {'doggy': 10, 'kitty': 4}
tractor.run(
spawn,
True,
name='arbiter',
statespace=statespace,
)
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async def rx_price_quotes_from_brokerd(us_symbols):
"""Verify we can spawn a daemon actor and retrieve streamed price data.
"""
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async with tractor.find_actor('brokerd') as portals:
if not portals:
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# only one per host address, spawns an actor if None
async with tractor.open_nursery() as nursery:
# no brokerd actor found
portal = await nursery.start_actor(
'brokerd',
rpc_module_paths=['piker.brokers.core'],
statespace={
'brokers2tickersubs': {},
'clients': {},
'dtasks': set()
},
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main=None, # don't start a main func - use rpc
)
# gotta expose in a broker agnostic way...
# retrieve initial symbol data
# sd = await portal.run(
# 'piker.brokers.core', 'symbol_data', symbols=us_symbols)
# assert list(sd.keys()) == us_symbols
gen = await portal.run(
'piker.brokers.core',
'_test_price_stream',
broker='robinhood',
symbols=us_symbols,
)
# it'd sure be nice to have an asyncitertools here...
async for quotes in gen:
assert quotes
for key in quotes:
assert key in us_symbols
break
# terminate far-end async-gen
# await gen.asend(None)
# break
# stop all spawned subactors
await nursery.cancel()
# arbitter is cancelled here due to `find_actors()` internals
# (which internally uses `get_arbiter` which kills its channel
# server scope on exit)
def test_rx_price_quotes_from_brokerd(us_symbols):
tractor.run(
rx_price_quotes_from_brokerd,
us_symbols,
name='arbiter',
)