anti
f2b3393669
Replaces LICENSE (GPLv3 -> AGPLv3) and prepends `SPDX-License-Identifier: AGPL-3.0-or-later` to every source file across decnet/, decnet_web/, tests/, scripts/, and tools/. Rationale: closes the GPLv3 ASP loophole so any party operating a modified DECNET as a network service must offer their modified source. Personal copyright (Samuel Paschuan) + inbound=outbound contributions make a future unilateral relicense infeasible. - LICENSE: full AGPL-3.0 text (gnu.org/licenses/agpl-3.0.txt) - COPYRIGHT: project copyright notice - tools/add_spdx_headers.py: idempotent header injector (shebang- and PEP 263-aware) Touches 1565 source files (.py, .ts, .tsx, .js, .jsx, .css, .sh). No behavior change; comments only.
87 lines
3.1 KiB
Python
87 lines
3.1 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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"""Bus factory — selects a :class:`~decnet.bus.base.BaseBus` implementation.
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Dispatch key: the ``DECNET_BUS_TYPE`` environment variable.
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* ``unix`` (default) → :class:`~decnet.bus.unix_client.UnixSocketBus`
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* ``fake`` → :class:`~decnet.bus.fake.FakeBus` (in-process)
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If ``DECNET_BUS_ENABLED`` is ``"false"`` the factory short-circuits to
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:class:`~decnet.bus.fake.NullBus` regardless of ``DECNET_BUS_TYPE`` — a
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cheap way for dev environments to run workers without a bus daemon.
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Mirrors :mod:`decnet.web.db.factory` (lazy imports inside each branch,
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env-driven dispatch, optional telemetry wrapping). Callers MUST use
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:func:`get_bus` rather than instantiating transports directly.
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"""
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from __future__ import annotations
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import os
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from typing import Any
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from decnet.bus.base import BaseBus
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def get_bus(**kwargs: Any) -> BaseBus:
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"""Instantiate the bus implementation selected by environment.
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Keyword arguments are forwarded to the concrete transport:
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* ``UnixSocketBus`` accepts ``socket_path`` (overrides
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``DECNET_BUS_SOCKET``) and ``client_name``.
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* ``FakeBus`` accepts ``queue_size``.
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"""
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if os.environ.get("DECNET_BUS_ENABLED", "true").lower() == "false":
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from decnet.bus.fake import NullBus
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return NullBus()
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bus_type = os.environ.get("DECNET_BUS_TYPE", "unix").lower()
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if bus_type == "unix":
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from decnet.bus.unix_client import UnixSocketBus
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socket_path = kwargs.pop("socket_path", None) or _default_socket_path()
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bus: BaseBus = UnixSocketBus(socket_path=socket_path, **kwargs)
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elif bus_type == "fake":
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from decnet.bus.fake import FakeBus
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bus = FakeBus(**kwargs)
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else:
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raise ValueError(f"Unsupported bus type: {bus_type}")
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return _maybe_wrap_telemetry(bus)
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def _default_socket_path() -> str:
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"""Return the bus socket path honoring ``DECNET_BUS_SOCKET`` and falling
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back to ``/run/decnet/bus.sock`` → ``~/.decnet/bus.sock``.
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The runtime path (``/run/decnet``) is preferred because systemd
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``RuntimeDirectory=decnet`` sets it up with the right perms; the home
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fallback keeps dev boxes usable without systemd.
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"""
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explicit = os.environ.get("DECNET_BUS_SOCKET")
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if explicit:
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return explicit
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runtime_dir = "/run/decnet"
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if os.path.isdir(runtime_dir) and os.access(runtime_dir, os.W_OK):
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return f"{runtime_dir}/bus.sock"
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return os.path.expanduser("~/.decnet/bus.sock")
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def _maybe_wrap_telemetry(bus: BaseBus) -> BaseBus:
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"""Wrap *bus* in a tracing proxy if OTEL is enabled, else return as-is.
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Uses :func:`decnet.telemetry.wrap_repository` as the underlying proxy —
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its implementation is generic (wraps any async method in a span), so we
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reuse it with a bus-appropriate tracer name. If telemetry isn't wired
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up at all we no-op.
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"""
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try:
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from decnet.telemetry import wrap_repository
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except ImportError:
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return bus
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try:
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return wrap_repository(bus)
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except Exception: # pragma: no cover - defensive
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return bus
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