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kevinveenbirkenbachandClaude Opus 5
cf82841be8
The template carried a three-way conditional across three {% set %} lines,
which was already at the edge of readability. Move the decision into
lookup('smtp_host') as plain control flow and pin all six cases in tests.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
from __future__ import annotations
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from typing import Any
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from ansible.errors import AnsibleError
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from ansible.module_utils.parsing.convert_bool import boolean as _to_bool
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from ansible.plugins.lookup import LookupBase
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LOOPBACK = "127.0.0.1"
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NODE_GROUP = "svc-swarm-node"
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MANAGER_GROUP = "svc-swarm-manager"
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def resolve_smtp_host(variables: dict[str, Any], email: dict[str, Any]) -> Any:
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"""Return the SMTP endpoint msmtp relays through.
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Args:
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variables: the play's variable namespace.
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email: the resolved ``lookup('email')`` mapping.
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Returns:
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The configured relay host, the loopback address, or a swarm manager.
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Outside the containerised test rig the configured relay is used unchanged.
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Inside it that relay domain has neither DNS nor a route: a host carrying the
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stack itself reaches mail on loopback, while a bare infra node has nothing
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listening there and has to enter through the manager's routing mesh.
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"""
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relay = email.get("host")
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in_rig = _to_bool(email.get("external"), strict=False) and _to_bool(
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variables.get("DOCKER_IN_CONTAINER"), strict=False
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)
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if not in_rig:
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return relay
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if variables.get("DEPLOYMENT_MODE") == "compose" or NODE_GROUP in (
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variables.get("group_names") or []
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):
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return LOOPBACK
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managers = (variables.get("groups") or {}).get(MANAGER_GROUP) or []
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return managers[0] if managers else relay
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class LookupModule(LookupBase):
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"""
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Usage:
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{{ lookup('smtp_host', email) }}
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SMTP endpoint for the msmtp relay config. Takes the resolved email mapping.
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"""
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def run(self, terms, variables: dict[str, Any] | None = None, **kwargs):
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if len(terms or []) != 1:
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raise AnsibleError(
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"smtp_host: expected exactly 1 term: lookup('smtp_host', email)"
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)
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email = terms[0]
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if not isinstance(email, dict):
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raise AnsibleError("smtp_host: the term must be the email mapping.")
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variables = variables or getattr(self._templar, "available_variables", {}) or {}
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return [resolve_smtp_host(variables, email)]
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