stroblme
f52d9c3077
_serve_once treated a cancelled call future as finished, so an event loop cancelling all tasks at once (shutdown) never sent the worker a cancel and the call's thread kept asyncio.run waiting for SILENCE_S. The cameras audio test now removes its voice flow and device, the unpaired-frame test waits for its first frame before the unpair, and test_connector no longer inherits the controller an app test bound to demand.
337 lines
10 KiB
Python
337 lines
10 KiB
Python
"""The connector contract: polling, deduplication, health and discovery."""
|
|
|
|
import asyncio
|
|
from collections.abc import Callable
|
|
from types import SimpleNamespace
|
|
from typing import Any
|
|
|
|
import pytest
|
|
|
|
from fluksio.flow.artifacts import ArtifactStore
|
|
from fluksio.flow.connector import CONTRACT_VERSION, ConnectorNode
|
|
from fluksio.flow.controller import NODE_TYPES
|
|
from fluksio.flow.messages import DType, MessageSpec
|
|
from fluksio.flow.nodes import Node
|
|
from fluksio.flow.pipeline import Pipeline
|
|
from fluksio.flow.plugins import load_plugins
|
|
from fluksio.flow.supervision import Supervisor
|
|
|
|
|
|
class Sensor(ConnectorNode):
|
|
contract = CONTRACT_VERSION
|
|
title = "Test sensor"
|
|
description = "Reads whatever it is told to."
|
|
|
|
class Params(ConnectorNode.Params):
|
|
secret_token: str | None = None
|
|
|
|
def __init__(self, readings: list[Any] | None = None, **kwargs: Any) -> None:
|
|
super().__init__(**kwargs)
|
|
self._readings = list(readings or [])
|
|
self.polls = 0
|
|
|
|
async def poll(self) -> dict[str, Any] | None:
|
|
self.polls += 1
|
|
if not self._readings:
|
|
return None
|
|
value = self._readings.pop(0)
|
|
if isinstance(value, Exception):
|
|
raise value
|
|
return {"reading": value}
|
|
|
|
|
|
def a_sensor(readings: list[Any], **params: Any) -> Sensor:
|
|
node = Sensor(
|
|
readings=readings,
|
|
provides=[MessageSpec(name="reading", dtype=DType.FLOAT)],
|
|
params={"poll_interval": 0.01, **params},
|
|
)
|
|
node.assign_flow("demo", "sensor")
|
|
return node
|
|
|
|
|
|
def run_briefly(
|
|
node: ConnectorNode,
|
|
seconds: float = 0.12,
|
|
app: Any = None,
|
|
until: Callable[[], bool] | None = None,
|
|
) -> None:
|
|
"""Start the poll loop, let it tick a few times, stop it.
|
|
|
|
With ``until``, stop once that holds instead, giving up after 5 s: a fixed
|
|
pause is too short when the machine is busy. The caller's asserts then say
|
|
what never happened.
|
|
"""
|
|
|
|
async def cycle() -> None:
|
|
await node.start(app)
|
|
if until is None:
|
|
await asyncio.sleep(seconds)
|
|
else:
|
|
for _ in range(500):
|
|
if until():
|
|
break
|
|
await asyncio.sleep(0.01)
|
|
await node.stop()
|
|
|
|
asyncio.run(cycle())
|
|
|
|
|
|
def test_polling_publishes_what_it_reads():
|
|
node = a_sensor([21.5])
|
|
pipeline = Pipeline(nodes=[node])
|
|
|
|
run_briefly(node)
|
|
|
|
assert pipeline.state["demo.reading"] == 21.5
|
|
|
|
|
|
def test_an_unchanged_reading_is_not_republished():
|
|
node = a_sensor([21.5, 21.5, 21.5])
|
|
consumer_ran: list[float] = []
|
|
|
|
def consume(reading, params):
|
|
consumer_ran.append(reading)
|
|
return None
|
|
|
|
consumer = Node(
|
|
f=consume,
|
|
requires=[MessageSpec(name="reading", dtype=DType.FLOAT)],
|
|
name="consumer",
|
|
)
|
|
consumer.assign_flow("demo", "consumer")
|
|
Pipeline(nodes=[node, consumer])
|
|
|
|
run_briefly(node)
|
|
|
|
# Polled repeatedly, but the value never changed, so downstream ran once.
|
|
assert node.polls > 1
|
|
assert consumer_ran == [21.5]
|
|
|
|
|
|
def test_a_failing_poll_reports_down_and_keeps_going():
|
|
health: list[tuple[str, str | None]] = []
|
|
node = a_sensor([RuntimeError("device unplugged"), 21.5])
|
|
node._on_health = lambda _node, status, detail: health.append((status, detail))
|
|
Pipeline(nodes=[node])
|
|
|
|
# The first poll fails, so an "ok" after it is the recovery.
|
|
run_briefly(node, until=lambda: len(health) > 1 and health[-1][0] == "ok")
|
|
|
|
assert ("down", "RuntimeError: device unplugged") in health
|
|
# It recovered rather than giving up.
|
|
assert health[-1][0] == "ok"
|
|
|
|
|
|
def test_an_undeclared_port_keeps_failing_until_the_node_declares_it():
|
|
"""A publication that raised is retried, not remembered as published.
|
|
|
|
The loop remembers what it published. If it remembered what it read, a
|
|
value the node cannot publish would be skipped on the next poll, the poll
|
|
would succeed, and the node would go back to reporting itself healthy with
|
|
its port still dark.
|
|
"""
|
|
|
|
class Chatty(Sensor):
|
|
"""Reads a port it never declared."""
|
|
|
|
async def poll(self) -> dict[str, Any]:
|
|
self.polls += 1
|
|
return {"reading": 21.5, "lat": 48.1}
|
|
|
|
health: list[tuple[str, str | None]] = []
|
|
node = Chatty(
|
|
provides=[MessageSpec(name="reading", dtype=DType.FLOAT)],
|
|
params={"poll_interval": 0.01},
|
|
)
|
|
node.assign_flow("demo", "sensor")
|
|
node._on_health = lambda _node, status, detail: health.append((status, detail))
|
|
pipeline = Pipeline(nodes=[node])
|
|
|
|
run_briefly(node)
|
|
|
|
assert pipeline.state.get("demo.reading") is None
|
|
assert health[-1][0] == "down"
|
|
assert "NodeOutputError" in (health[-1][1] or "")
|
|
# Still failing on the last poll, not just the first.
|
|
assert len([entry for entry in health if entry[0] == "down"]) > 1
|
|
|
|
|
|
def test_a_push_session_that_fails_before_it_listens_reports_down():
|
|
"""A crashed loop is node health, not only a crash event."""
|
|
|
|
class Push(Sensor):
|
|
async def start(self, app: Any = None) -> None:
|
|
self._run_supervised("push", self._session)
|
|
|
|
async def _session(self) -> None:
|
|
raise ConnectionError("bridge unreachable")
|
|
|
|
health: list[tuple[str, str | None]] = []
|
|
node = Push(provides=[MessageSpec(name="reading", dtype=DType.FLOAT)])
|
|
node.assign_flow("demo", "push")
|
|
node._on_health = lambda _node, status, detail: health.append((status, detail))
|
|
|
|
async def scenario() -> None:
|
|
node.supervisor = Supervisor()
|
|
await node.start()
|
|
for _ in range(500):
|
|
if health:
|
|
break
|
|
await asyncio.sleep(0.01)
|
|
await node.supervisor.cancel_all()
|
|
|
|
asyncio.run(scenario())
|
|
|
|
assert health == [("down", "ConnectionError: bridge unreachable")]
|
|
|
|
|
|
class Actuator(ConnectorNode):
|
|
"""A connector that commands something instead of reading it."""
|
|
|
|
contract = CONTRACT_VERSION
|
|
title = "Test actuator"
|
|
|
|
def __init__(self, **kwargs: Any) -> None:
|
|
super().__init__(**kwargs)
|
|
self.commands: list[dict[str, Any]] = []
|
|
|
|
def write(self, **ports: Any) -> None:
|
|
self.commands.append(ports)
|
|
return None
|
|
|
|
|
|
def test_an_incoming_message_reaches_a_connector_that_writes():
|
|
node = Actuator(requires=[MessageSpec(name="level", dtype=DType.INT)])
|
|
node.assign_flow("demo", "actuator")
|
|
|
|
assert node.execute({"demo.level": 255}) is None
|
|
assert node.commands == [{"level": 255}]
|
|
|
|
|
|
def test_a_read_only_connector_ignores_what_reaches_it():
|
|
node = a_sensor([])
|
|
assert node.execute({}) is None
|
|
|
|
|
|
def test_a_credential_param_is_marked_for_the_editor():
|
|
schema = Sensor.Params.model_json_schema()
|
|
assert schema["properties"]["poll_interval"]["default"] == 0
|
|
assert "secret_token" in schema["properties"]
|
|
|
|
|
|
def test_a_connector_is_discovered_from_its_entry_point(monkeypatch):
|
|
class FakeDist:
|
|
name = "fluksio-connector-test"
|
|
version = "0.1.0"
|
|
|
|
class FakeEntry:
|
|
name = "test_sensor"
|
|
dist = FakeDist()
|
|
|
|
def load(self):
|
|
return Sensor
|
|
|
|
monkeypatch.setattr(
|
|
"fluksio.flow.plugins.entry_points", lambda group: [FakeEntry()]
|
|
)
|
|
try:
|
|
assert load_plugins() == ["test_sensor"]
|
|
assert NODE_TYPES["test_sensor"].plugin == "fluksio-connector-test 0.1.0"
|
|
assert NODE_TYPES["test_sensor"].title == "Test sensor"
|
|
finally:
|
|
NODE_TYPES.pop("test_sensor", None)
|
|
|
|
|
|
def test_a_connector_written_for_another_contract_is_refused(monkeypatch):
|
|
class Outdated(ConnectorNode):
|
|
contract = CONTRACT_VERSION + 1
|
|
|
|
class FakeEntry:
|
|
name = "outdated"
|
|
dist = None
|
|
|
|
def load(self):
|
|
return Outdated
|
|
|
|
monkeypatch.setattr(
|
|
"fluksio.flow.plugins.entry_points", lambda group: [FakeEntry()]
|
|
)
|
|
assert load_plugins() == []
|
|
assert "outdated" not in NODE_TYPES
|
|
|
|
|
|
def test_a_connector_may_not_take_over_a_built_in_type(monkeypatch):
|
|
class FakeEntry:
|
|
name = "mqtt"
|
|
dist = None
|
|
|
|
def load(self): # pragma: no cover - never reached
|
|
raise AssertionError("should not be loaded")
|
|
|
|
monkeypatch.setattr(
|
|
"fluksio.flow.plugins.entry_points", lambda group: [FakeEntry()]
|
|
)
|
|
assert load_plugins() == []
|
|
assert NODE_TYPES["mqtt"].plugin is None
|
|
|
|
|
|
def test_a_connector_publishes_bytes_as_a_media_reference(tmp_path):
|
|
"""A camera's reading is bytes, and bytes never travel as a message."""
|
|
|
|
class Camera(ConnectorNode):
|
|
contract = CONTRACT_VERSION
|
|
|
|
async def poll(self) -> dict[str, Any] | None:
|
|
return {"frame": self.save_artifact(b"\x89PNG...", "f.png", "image/png")}
|
|
|
|
node = Camera(
|
|
provides=[MessageSpec(name="frame", dtype=DType.IMAGE)],
|
|
params={"poll_interval": 0.01},
|
|
)
|
|
node.assign_flow("demo", "camera")
|
|
pipeline = Pipeline(nodes=[node])
|
|
|
|
# Before it starts there is no store to write to, and saying so beats an
|
|
# AttributeError from inside somebody's connector.
|
|
with pytest.raises(RuntimeError, match="artifact store"):
|
|
node.save_artifact(b"x")
|
|
|
|
store = ArtifactStore(tmp_path / "artifacts")
|
|
app = SimpleNamespace(state=SimpleNamespace(artifact_store=store))
|
|
run_briefly(node, app=app)
|
|
|
|
reference = pipeline.state["demo.frame"]
|
|
# It typechecks against the port it was published on, which is the whole
|
|
# point of a media dtype.
|
|
MessageSpec(name="demo.frame", dtype=DType.IMAGE).check(reference)
|
|
assert store.path(reference["digest"]).read_bytes() == b"\x89PNG..."
|
|
|
|
|
|
def test_a_port_is_wanted_while_watched_or_read(monkeypatch):
|
|
"""A camera fetches frames only while a screen shows them or a flow reads them."""
|
|
from fluksio.flow.demand import demand
|
|
|
|
node = a_sensor([])
|
|
# A worker process binds no controller and cannot see who watches. The
|
|
# one an app test bound stays on the process-wide `demand` after its stop.
|
|
monkeypatch.setattr(demand, "_controller", None)
|
|
assert node.wanted("reading")
|
|
|
|
reads: set[str] = set()
|
|
monkeypatch.setattr(
|
|
demand, "_controller", SimpleNamespace(consumed_messages=lambda: reads)
|
|
)
|
|
assert not node.wanted("reading")
|
|
|
|
reads.add("demo.reading")
|
|
assert node.wanted("reading")
|
|
|
|
reads.clear()
|
|
demand.want("a viewer", {"demo.reading"})
|
|
try:
|
|
assert node.wanted("reading")
|
|
finally:
|
|
demand.drop("a viewer")
|
|
assert not node.wanted("reading")
|