55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
"""Shared base class for host-side egress apply across backends.
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Each backend subclasses EgressApplicator and overrides _signal_bundle_reload
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with the backend-specific kill command.
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"""
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from __future__ import annotations
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from abc import ABC, abstractmethod
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from pathlib import Path
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from ..bottle_state import egress_state_dir
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from ..egress import EGRESS_ROUTES_FILENAME
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from ..egress_addon_core import LOG_OFF, load_config
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class EgressApplyError(RuntimeError):
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pass
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class EgressApplicator(ABC):
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def apply_routes_change(self, slug: str, content: str) -> tuple[str, str]:
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"""Persist `content` to the live routes file and reload egress."""
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self.validate_routes_content(content)
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routes_path = self._routes_path(slug)
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routes_path.parent.mkdir(parents=True, exist_ok=True)
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before = routes_path.read_text(encoding="utf-8") if routes_path.exists() else ""
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routes_path.write_text(content, encoding="utf-8")
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routes_path.chmod(0o600)
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self._signal_bundle_reload(slug)
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return before, content
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@staticmethod
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def validate_routes_content(content: str) -> None:
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try:
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config = load_config(content)
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except ValueError as e:
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raise EgressApplyError(
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f"proposed routes.yaml is not valid: {e}"
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) from e
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if config.log != LOG_OFF:
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raise EgressApplyError(
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"proposed routes.yaml must not change egress logging"
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)
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@staticmethod
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def _routes_path(slug: str) -> Path:
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return egress_state_dir(slug) / EGRESS_ROUTES_FILENAME
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@abstractmethod
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def _signal_bundle_reload(self, slug: str) -> None: ...
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__all__ = ["EgressApplicator", "EgressApplyError"]
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