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import asyncio
import sys
from flaky import flaky
import pytest
from streamz import Source
from streamz.utils_test import wait_for, await_for, gen_test
import socket
def test_periodic():
s = Source.from_periodic(lambda: True)
l = s.sink_to_list()
assert s.stopped
s.start()
wait_for(lambda: l, 0.3, period=0.01)
wait_for(lambda: len(l) > 1, 0.3, period=0.01)
assert all(l)
@pytest.mark.xfail(reason="Tries connecting to port")
@flaky(max_runs=3, min_passes=1)
def test_tcp():
port = 9876
s = Source.from_tcp(port)
out = s.sink_to_list()
s.start()
wait_for(lambda: s.server is not None, 2, period=0.02)
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(("localhost", port))
sock.send(b'data\n')
sock.close()
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(("localhost", port))
sock.send(b'data\n')
sock2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock2.connect(("localhost", port))
sock2.send(b'data2\n')
wait_for(lambda: out == [b'data\n', b'data\n', b'data2\n'], 2,
period=0.01)
finally:
s.stop()
sock.close()
sock2.close()
@pytest.mark.xfail(reason="Tries connecting to port")
@flaky(max_runs=3, min_passes=1)
@gen_test(timeout=60)
def test_tcp_async():
port = 9876
s = Source.from_tcp(port)
out = s.sink_to_list()
s.start()
yield await_for(lambda: s.server is not None, 2, period=0.02)
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(("localhost", port))
sock.send(b'data\n')
sock.close()
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(("localhost", port))
sock.send(b'data\n')
sock2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock2.connect(("localhost", port))
sock2.send(b'data2\n')
yield await_for(lambda: out == [b'data\n', b'data\n', b'data2\n'], 2,
period=0.01)
finally:
s.stop()
sock.close()
sock2.close()
@pytest.mark.xfail(reason="Tries connecting to port")
def test_http():
requests = pytest.importorskip('requests')
port = 9875
s = Source.from_http_server(port)
out = s.sink_to_list()
s.start()
wait_for(lambda: s.server is not None, 2, period=0.02)
r = requests.post('http://localhost:%i/' % port, data=b'data')
wait_for(lambda: out == [b'data'], 2, period=0.01)
assert r.ok
r = requests.post('http://localhost:%i/other' % port, data=b'data2')
wait_for(lambda: out == [b'data', b'data2'], 2, period=0.01)
assert r.ok
s.stop()
with pytest.raises(requests.exceptions.RequestException):
requests.post('http://localhost:%i/other' % port, data=b'data2')
@pytest.mark.xfail(reason="Tries connecting to port")
@gen_test(timeout=60)
def test_process():
cmd = ["python", "-c", "for i in range(4): print(i, end='')"]
s = Source.from_process(cmd, with_end=True)
if sys.platform != "win32":
# don't know why - something with pytest and new processes
policy = asyncio.get_event_loop_policy()
watcher = asyncio.SafeChildWatcher()
policy.set_child_watcher(watcher)
watcher.attach_loop(s.loop.asyncio_loop)
out = s.sink_to_list()
s.start()
yield await_for(lambda: out == [b'0123'], timeout=5)
s.stop()
@pytest.mark.xfail(reason="Tries connecting to port")
@gen_test(timeout=60)
def test_process_str():
cmd = 'python -c "for i in range(4): print(i)"'
s = Source.from_process(cmd)
if sys.platform != "win32":
# don't know why - something with pytest and new processes
policy = asyncio.get_event_loop_policy()
watcher = asyncio.SafeChildWatcher()
policy.set_child_watcher(watcher)
watcher.attach_loop(s.loop.asyncio_loop)
out = s.sink_to_list()
s.start()
yield await_for(lambda: out == [b'0\n', b'1\n', b'2\n', b'3\n'], timeout=5)
s.stop()
def test_from_iterable():
source = Source.from_iterable(range(3))
L = source.sink_to_list()
source.start()
wait_for(lambda: L == [0, 1, 2], 0.1)
def test_from_iterable_backpressure():
it = iter(range(5))
source = Source.from_iterable(it)
L = source.rate_limit(0.1).sink_to_list()
source.start()
wait_for(lambda: L == [0], 1, period=0.01)
assert next(it) == 2 # 1 is in blocked _emit
def test_from_iterable_stop():
from _pytest.outcomes import Failed
source = Source.from_iterable(range(5))
L = source.rate_limit(0.01).sink_to_list()
source.start()
wait_for(lambda: L == [0], 1)
source.stop()
assert source.stopped
with pytest.raises(Failed):
wait_for(lambda: L == [0, 1, 2], 0.1)
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