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kevinveenbirkenbachandClaude Opus 4.8
337a0b2add
Floor-to-1 now applies only to the topology default (no override term). An explicit service_replicas=0 emits 'replicas: 0' (service created but unscheduled, to be scaled up by a later task) instead of being bumped to 1. Empty/missing inventory group on the default path still floors to 1. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
"""Lookup `compose_replicas`: emit `replicas: <N>` only in swarm mode.
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Single SPOT for swarm replica calculation across the repo.
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Default value: `len(groups[application_id])` - one task per host in the
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application's inventory group. Single-host inventories yield 1; multi-
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host swarm inventories yield N matching the topology.
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Override: pass an explicit value as the first term.
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Examples:
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{{ lookup('compose_replicas') }} # topology default
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{{ lookup('compose_replicas', 1) }} # force replicas: 1
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{{ lookup('compose_replicas', N) }} # force replicas: N
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In compose mode the lookup returns the empty string because
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docker-compose ignores `deploy.replicas`. Wrapping the emit in the
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`deploy:` block remains the caller's responsibility - typically
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`roles/sys-svc-container/templates/deploy.yml.j2`.
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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.lookup import LookupBase
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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 and len(terms) > 1:
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raise AnsibleError(
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"compose_replicas lookup accepts at most one term: an explicit replicas override"
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)
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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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raw_mode = vars_.get("DEPLOYMENT_MODE", "compose")
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if templar is not None:
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with contextlib.suppress(Exception):
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raw_mode = templar.template(raw_mode)
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if str(raw_mode).strip() != "swarm":
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return [""]
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if terms:
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replicas = terms[0]
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else:
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app_id = vars_.get("application_id")
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if templar is not None and app_id is not None:
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with contextlib.suppress(Exception):
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app_id = templar.template(app_id)
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groups = vars_.get("groups", {}) or {}
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hosts = groups.get(app_id, []) if app_id else []
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replicas = len(hosts or [])
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try:
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n = int(replicas)
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except (TypeError, ValueError) as exc:
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raise AnsibleError(
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f"compose_replicas: cannot coerce '{replicas}' to int: {exc}"
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) from exc
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if not terms and n < 1:
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n = 1
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return [f"replicas: {n}"]
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