anti
fbf289ff63
Land the `decnet bus` worker and `get_bus()` factory. Transport is a host-local UNIX-domain socket (0660, group=decnet); authz is the file mode. Wire framing is a tiny verb-line + 4-byte-BE length + orjson body. NATS-style wildcard topics (`*`, `>`). At-most-once, fire-and-forget — DB stays the source of truth. `FakeBus` / `NullBus` for tests and the disabled path. Cross-host federation is deferred to a future `--bridge-tcp` mode; DEBT-030 is master-only and unblocked.
53 lines
1.9 KiB
Python
53 lines
1.9 KiB
Python
"""Tests for :func:`decnet.bus.factory.get_bus` dispatch."""
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from __future__ import annotations
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import pathlib
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import pytest
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from decnet.bus.factory import _default_socket_path, get_bus
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from decnet.bus.fake import FakeBus, NullBus
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from decnet.bus.unix_client import UnixSocketBus
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def test_disabled_returns_null_bus(monkeypatch: pytest.MonkeyPatch) -> None:
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monkeypatch.setenv("DECNET_BUS_ENABLED", "false")
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monkeypatch.setenv("DECNET_BUS_TYPE", "unix") # ignored when disabled
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bus = get_bus()
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assert isinstance(bus, NullBus)
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def test_fake_dispatch(monkeypatch: pytest.MonkeyPatch) -> None:
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monkeypatch.setenv("DECNET_BUS_ENABLED", "true")
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monkeypatch.setenv("DECNET_BUS_TYPE", "fake")
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bus = get_bus()
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assert isinstance(bus, FakeBus)
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def test_unix_dispatch(monkeypatch: pytest.MonkeyPatch, tmp_path: pathlib.Path) -> None:
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monkeypatch.setenv("DECNET_BUS_ENABLED", "true")
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monkeypatch.setenv("DECNET_BUS_TYPE", "unix")
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monkeypatch.setenv("DECNET_BUS_SOCKET", str(tmp_path / "b.sock"))
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bus = get_bus()
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assert isinstance(bus, UnixSocketBus)
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def test_unknown_type_raises(monkeypatch: pytest.MonkeyPatch) -> None:
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monkeypatch.setenv("DECNET_BUS_ENABLED", "true")
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monkeypatch.setenv("DECNET_BUS_TYPE", "mqtt")
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with pytest.raises(ValueError, match="Unsupported bus type"):
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get_bus()
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def test_default_socket_path_honors_env(monkeypatch: pytest.MonkeyPatch) -> None:
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monkeypatch.setenv("DECNET_BUS_SOCKET", "/tmp/explicit.sock")
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assert _default_socket_path() == "/tmp/explicit.sock"
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def test_default_socket_path_falls_back_to_home(monkeypatch: pytest.MonkeyPatch) -> None:
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monkeypatch.delenv("DECNET_BUS_SOCKET", raising=False)
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# Force /run/decnet to look unusable.
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monkeypatch.setattr("os.path.isdir", lambda p: False)
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path = _default_socket_path()
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assert path.endswith(".decnet/bus.sock")
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