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kevinveenbirkenbachandClaude Opus 5
4d79f7c19f
`ruff`'s B905 wants every `zip()` to say whether it tolerates operands of different length. Here it never sees one: both operands are the `packed` form of an address from the same network, so both are four bytes for IPv4 and sixteen for IPv6. `strict=True` states that, and turns a silently truncated - and therefore too permissive - regex into an error should the invariant ever break. The three other files carry `ruff format` reflows the same run produced. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
68 lines
2.2 KiB
Python
68 lines
2.2 KiB
Python
"""Lookup `subnet_address_regex`: match any address in the role's local subnet.
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Single SPOT for turning `networks.local.subnet` into an address matcher. A swarm
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task carries an address on every network it joins, all of them site-local, so a
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service that must bind to one of them needs this rather than a generic
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"site-local" selector.
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Example:
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{{ lookup('subnet_address_regex') }} # 192\\.168\\.24\\.\\d+
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Raises when the subnet is missing or its prefix is not octet-aligned, so a
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topology this cannot express fails at render time instead of binding silently
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to the wrong network.
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"""
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from __future__ import annotations
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import contextlib
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from typing import Any
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from ansible.errors import AnsibleError
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from ansible.plugins.loader import lookup_loader
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from ansible.plugins.lookup import LookupBase
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from utils.networks.address import subnet_address_regex
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def _resolve_var(templar: Any, value: Any) -> Any:
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if templar is not None and value is not None:
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with contextlib.suppress(Exception):
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return templar.template(value)
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return value
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class LookupModule(LookupBase):
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def run(
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self,
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terms: list[Any] | None,
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variables: dict[str, Any] | None = None,
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**kwargs: Any,
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) -> list[str]:
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if terms:
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raise AnsibleError("subnet_address_regex lookup takes no positional terms")
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vars_ = variables or getattr(self._templar, "available_variables", {}) or {}
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templar = getattr(self, "_templar", None)
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application_id = _resolve_var(templar, vars_.get("application_id"))
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if not application_id:
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raise AnsibleError(
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"subnet_address_regex lookup: application_id is required in variables"
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)
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config_lookup = lookup_loader.get(
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"config", loader=self._loader, templar=templar
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)
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subnet = config_lookup.run(
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[str(application_id), "networks.local.subnet"], variables=vars_
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)[0]
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try:
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return [subnet_address_regex(str(subnet))]
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except ValueError as exc:
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raise AnsibleError(
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f"subnet_address_regex lookup for '{application_id}': {exc}"
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) from exc
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