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import asyncio
import async_timeout
import pytest
from channels.exceptions import ChannelFull
from channels.layers import InMemoryChannelLayer
@pytest.fixture()
async def channel_layer():
"""
Channel layer fixture that flushes automatically.
"""
channel_layer = InMemoryChannelLayer(capacity=3)
yield channel_layer
await channel_layer.flush()
await channel_layer.close()
@pytest.mark.asyncio
async def test_send_receive(channel_layer):
"""
Makes sure we can send a message to a normal channel then receive it.
"""
await channel_layer.send(
"test-channel-1", {"type": "test.message", "text": "Ahoy-hoy!"}
)
await channel_layer.send(
"test-channel-1", {"type": "test.message", "text": "Ahoy-hoy!"}
)
message = await channel_layer.receive("test-channel-1")
assert message["type"] == "test.message"
assert message["text"] == "Ahoy-hoy!"
# not removed because not empty
assert "test-channel-1" in channel_layer.channels
message = await channel_layer.receive("test-channel-1")
assert message["type"] == "test.message"
assert message["text"] == "Ahoy-hoy!"
# removed because empty
assert "test-channel-1" not in channel_layer.channels
@pytest.mark.asyncio
async def test_race_empty(channel_layer):
"""
Makes sure the race is handled gracefully.
"""
receive_task = asyncio.create_task(channel_layer.receive("test-channel-1"))
await asyncio.sleep(0.1)
await channel_layer.send(
"test-channel-1", {"type": "test.message", "text": "Ahoy-hoy!"}
)
del channel_layer.channels["test-channel-1"]
await asyncio.sleep(0.1)
message = await receive_task
assert message["type"] == "test.message"
assert message["text"] == "Ahoy-hoy!"
@pytest.mark.asyncio
async def test_send_capacity(channel_layer):
"""
Makes sure we get ChannelFull when we hit the send capacity
"""
await channel_layer.send("test-channel-1", {"type": "test.message"})
await channel_layer.send("test-channel-1", {"type": "test.message"})
await channel_layer.send("test-channel-1", {"type": "test.message"})
with pytest.raises(ChannelFull):
await channel_layer.send("test-channel-1", {"type": "test.message"})
@pytest.mark.asyncio
async def test_process_local_send_receive(channel_layer):
"""
Makes sure we can send a message to a process-local channel then receive it.
"""
channel_name = await channel_layer.new_channel()
await channel_layer.send(
channel_name, {"type": "test.message", "text": "Local only please"}
)
message = await channel_layer.receive(channel_name)
assert message["type"] == "test.message"
assert message["text"] == "Local only please"
@pytest.mark.asyncio
async def test_multi_send_receive(channel_layer):
"""
Tests overlapping sends and receives, and ordering.
"""
await channel_layer.send("test-channel-3", {"type": "message.1"})
await channel_layer.send("test-channel-3", {"type": "message.2"})
await channel_layer.send("test-channel-3", {"type": "message.3"})
assert (await channel_layer.receive("test-channel-3"))["type"] == "message.1"
assert (await channel_layer.receive("test-channel-3"))["type"] == "message.2"
assert (await channel_layer.receive("test-channel-3"))["type"] == "message.3"
@pytest.mark.asyncio
async def test_groups_basic(channel_layer):
"""
Tests basic group operation.
"""
await channel_layer.group_add("test-group", "test-gr-chan-1")
await channel_layer.group_add("test-group", "test-gr-chan-2")
await channel_layer.group_add("test-group", "test-gr-chan-3")
await channel_layer.group_discard("test-group", "test-gr-chan-2")
await channel_layer.group_send("test-group", {"type": "message.1"})
# Make sure we get the message on the two channels that were in
async with async_timeout.timeout(1):
assert (await channel_layer.receive("test-gr-chan-1"))["type"] == "message.1"
assert (await channel_layer.receive("test-gr-chan-3"))["type"] == "message.1"
# Make sure the removed channel did not get the message
with pytest.raises(asyncio.TimeoutError):
async with async_timeout.timeout(1):
await channel_layer.receive("test-gr-chan-2")
@pytest.mark.asyncio
async def test_groups_channel_full(channel_layer):
"""
Tests that group_send ignores ChannelFull
"""
await channel_layer.group_add("test-group", "test-gr-chan-1")
await channel_layer.group_send("test-group", {"type": "message.1"})
await channel_layer.group_send("test-group", {"type": "message.1"})
await channel_layer.group_send("test-group", {"type": "message.1"})
await channel_layer.group_send("test-group", {"type": "message.1"})
await channel_layer.group_send("test-group", {"type": "message.1"})
@pytest.mark.asyncio
async def test_expiry_single():
"""
Tests that a message can expire.
"""
channel_layer = InMemoryChannelLayer(expiry=0.1)
await channel_layer.send("test-channel-1", {"type": "message.1"})
assert len(channel_layer.channels) == 1
await asyncio.sleep(0.1)
# Message should have expired and been dropped.
with pytest.raises(asyncio.TimeoutError):
async with async_timeout.timeout(0.5):
await channel_layer.receive("test-channel-1")
# Channel should be cleaned up.
assert len(channel_layer.channels) == 0
@pytest.mark.asyncio
async def test_expiry_unread():
"""
Tests that a message on a channel can expire and be cleaned up even if
the channel is not read from again.
"""
channel_layer = InMemoryChannelLayer(expiry=0.1)
await channel_layer.send("test-channel-1", {"type": "message.1"})
await asyncio.sleep(0.1)
await channel_layer.send("test-channel-2", {"type": "message.2"})
assert len(channel_layer.channels) == 2
assert (await channel_layer.receive("test-channel-2"))["type"] == "message.2"
# Both channels should be cleaned up.
assert len(channel_layer.channels) == 0
@pytest.mark.asyncio
async def test_expiry_multi():
"""
Tests that multiple messages can expire.
"""
channel_layer = InMemoryChannelLayer(expiry=0.1)
await channel_layer.send("test-channel-1", {"type": "message.1"})
await channel_layer.send("test-channel-1", {"type": "message.2"})
await channel_layer.send("test-channel-1", {"type": "message.3"})
assert (await channel_layer.receive("test-channel-1"))["type"] == "message.1"
await asyncio.sleep(0.1)
await channel_layer.send("test-channel-1", {"type": "message.4"})
assert (await channel_layer.receive("test-channel-1"))["type"] == "message.4"
# The second and third message should have expired and been dropped.
with pytest.raises(asyncio.TimeoutError):
async with async_timeout.timeout(0.5):
await channel_layer.receive("test-channel-1")
# Channel should be cleaned up.
assert len(channel_layer.channels) == 0
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