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tractor/tests/test_tractor.py

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Python

"""
Actor model API testing
"""
import time
import pytest
import trio
from piker import tractor
@pytest.fixture
def us_symbols():
return ['TSLA', 'AAPL', 'CGC', 'CRON']
@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() as nursery:
pass
def test_local_actor_async_gen():
"""Verify a simple async function in-process.
"""
async def print_loop(actor):
for i in range(10):
await trio.sleep(0.1)
start = time.time()
tractor.run(print_loop)
# ensure the sleeps were actually awaited
assert time.time() - start >= 1
@pytest.mark.trio
async def test_rx_price_quotes_from_brokerd(us_symbols):
"""Verify we can spawn a daemon actor and retrieve streamed price data.
"""
async with tractor.find_actor('brokerd') as portals:
async with tractor.open_nursery() as nursery:
# only one per host address, spawns an actor if None
if not portals:
# no brokerd actor found
portal = await nursery.start_actor(
'brokerd',
['piker.brokers.core'],
statespace={
'brokers2tickersubs': {},
'clients': {},
'dtasks': set()
},
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
# arbitter is cancelled here due to `find_actors()` internals
# (which internally uses `get_arbiter` which kills the root
# nursery on __exit__)