mteehan
200e078bc5
- Add daemon/ module with aiohttp server, sync client, and handler registry - Add daemon/handlers/ for privileged operations (acme, dnsmasq, firewall, logs, nginx, wireguard) - Add system/acme-deploy.py, vacuum-walld sudoers and systemd service - Update API routes to use daemon client instead of lib/ directly - Update lib/, tests/, and webui/ for new architecture - Update docs and deployment scripts
322 lines
9.1 KiB
Python
322 lines
9.1 KiB
Python
"""aiohttp server for vacuum-walld.
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Listens on a Unix socket, serves the daemon API to the web UI.
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Handles routing, caching, batching, and request/response lifecycle.
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"""
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import asyncio
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import json
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import logging
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import os
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import signal
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from collections.abc import Callable
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from pathlib import Path
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from typing import Any
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from aiohttp import web
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logger = logging.getLogger(__name__)
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PROJECT_DIR = Path(__file__).resolve().parent.parent
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SOCKET_PATH = PROJECT_DIR / "data" / "daemon.sock"
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class Cache:
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"""Tag-based cache. Entries persist until invalidated by write operations.
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External changes to system state (e.g., manual firewall-cmd, config edits on
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disk) bypass cache invalidation and will result in stale data until the cache
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is cleared or affected tags are invalidated.
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"""
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def __init__(self) -> None:
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self._store: dict[str, Any] = {}
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self._tags: dict[str, set[str]] = {}
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def get(self, key: str) -> Any | None:
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return self._store.get(key)
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def set(self, key: str, value: Any, tags: set[str]) -> None:
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self._store[key] = value
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self._tags[key] = tags
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def invalidate(self, *tags: str) -> None:
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for tag in tags:
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keys = [k for k, ts in self._tags.items() if tag in ts]
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for k in keys:
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self._store.pop(k, None)
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self._tags.pop(k, None)
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def clear(self) -> None:
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self._store.clear()
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self._tags.clear()
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cache = Cache()
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class Handler:
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"""Wrapper for a daemon handler function."""
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def __init__(
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self,
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method: str,
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path: str,
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cache_tags: set[str] | None = None,
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invalidate: set[str] | None = None,
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) -> None:
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self.method = method.upper()
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self.path = path
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self.cache_tags = cache_tags or set()
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self.invalidate = invalidate or set()
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class Registry:
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"""Route registry for daemon handlers."""
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def __init__(self) -> None:
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self._routes: dict[tuple[str, str], Callable] = {}
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def register(
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self,
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method: str,
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path: str,
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cache_tags: set[str] | None = None,
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invalidate: set[str] | None = None,
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):
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def decorator(fn: Callable) -> Callable:
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self._routes[(method.upper(), path)] = fn
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fn._handler = Handler(method, path, cache_tags, invalidate) # type: ignore[attr-defined]
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return fn
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return decorator
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def get(self, method: str, path: str) -> Callable | None:
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return self._routes.get((method.upper(), path))
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registry = Registry()
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class NotFoundError(Exception):
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"""Raised when a requested resource is not found."""
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pass
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def ok(data: Any = None) -> web.Response:
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return web.json_response({"ok": True, "data": data})
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def error(msg: str, code: int = 400) -> web.Response:
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return web.json_response({"ok": False, "error": msg}, status=code)
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async def _handle_request(request: web.Request) -> web.Response:
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"""Dispatch a request to the appropriate handler."""
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handler_fn = registry.get(request.method, request.path)
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if handler_fn is None:
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return error(f"Method {request.method} not allowed for {request.path}", 404)
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h = getattr(handler_fn, "_handler", None)
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# Build body from JSON and merge query params. GET requests send params
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# as URL query string, so they need to be treated as body for handlers.
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body: dict[str, Any] | None = None
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if request.content_type == "application/json":
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try:
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body = await request.json()
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except json.JSONDecodeError:
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return error("Invalid JSON body", 400)
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query_dict = dict(request.query)
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if query_dict:
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query_body = {k: v[0] if len(v) == 1 else v for k, v in query_dict.items()}
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if body is not None:
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merged = {**query_body, **body}
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body = merged
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else:
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body = query_body
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cache_key = json.dumps(
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{
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"method": request.method,
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"path": request.path,
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"query": query_dict,
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"body": body,
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},
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sort_keys=True,
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)
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# Cache hit for read operations
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if h and h.cache_tags:
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cached = cache.get(cache_key)
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if cached is not None:
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return ok(cached)
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try:
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if body is not None:
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result = handler_fn(request, body)
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if asyncio.iscoroutine(result):
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result = await result
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else:
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result = handler_fn(request, None)
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if asyncio.iscoroutine(result):
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result = await result
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except NotFoundError as exc:
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return error(str(exc), 404)
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except ValueError as exc:
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return error(str(exc), 400)
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except RuntimeError as exc:
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logger.error("Handler error: %s", exc)
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return error(str(exc), 500)
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except Exception as exc:
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logger.exception(
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"Unexpected handler error in %s %s", request.method, request.path
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)
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return error(f"Internal error: {exc}", 500)
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# Cache write for read operations
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if h and h.cache_tags and isinstance(result, dict) and result.get("ok"):
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cache.set(cache_key, result.get("data"), h.cache_tags)
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# Invalidate on write operations
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if h and h.invalidate:
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cache.invalidate(*h.invalidate)
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# Convert result to response if not already
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if isinstance(result, web.Response):
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return result
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if isinstance(result, dict) and result.get("ok") is False:
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return error(result["error"], result.get("code", 400))
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return ok(result)
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async def _handle_batch(request: web.Request) -> web.Response:
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"""Handle batch requests: execute operations in order, return keyed results."""
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try:
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body = await request.json()
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except json.JSONDecodeError:
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return error("Invalid JSON body", 400)
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ops = body.get("ops", [])
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if not isinstance(ops, list):
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return error("'ops' must be a list", 400)
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results: dict[str, Any] = {}
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for op in ops:
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op_id = op.get("id")
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method = op.get("method", "GET").upper()
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path = op.get("path", "")
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if not op_id or not path:
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results[op_id] = {"ok": False, "error": "'id' and 'path' are required"}
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continue
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handler_fn = registry.get(method, path)
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if handler_fn is None:
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results[op_id] = {
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"ok": False,
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"error": f"Endpoint not found: {method} {path}",
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}
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continue
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op_body = op.get("body")
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h = getattr(handler_fn, "_handler", None)
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try:
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result = handler_fn(None, op_body)
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if asyncio.iscoroutine(result):
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result = await result
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except Exception as exc:
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logger.error("Batch handler error for %s: %s", op_id, exc)
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results[op_id] = {"ok": False, "error": str(exc)}
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continue
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# Strip ok/data wrapper for batch results
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if isinstance(result, dict) and result.get("ok") is not None:
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results[op_id] = result
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else:
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results[op_id] = {"ok": True, "data": result}
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# Invalidate on write
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if h and h.invalidate:
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cache.invalidate(*h.invalidate)
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return ok(results)
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def create_app() -> web.Application:
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app = web.Application()
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app.router.add_route("GET", "/health", _health)
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app.router.add_route("POST", "/batch", _handle_batch)
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app.router.add_route("{tail:.*}", _catch_all)
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return app
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async def _health(_request: web.Request) -> web.Response:
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return ok({"pid": os.getpid(), "socket": str(SOCKET_PATH)})
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async def _catch_all(request: web.Request) -> web.Response:
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"""Catch-all for registered routes."""
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return await _handle_request(request)
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def _register_routes() -> None:
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"""Import all handler modules to register routes."""
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from daemon.handlers import (
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acme, # noqa: F401
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dnsmasq, # noqa: F401
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firewall, # noqa: F401
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logs, # noqa: F401
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nginx, # noqa: F401
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wireguard, # noqa: F401
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)
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def main() -> None:
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"""Entry point for vacuum-walld."""
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from lib.logging import setup_logging
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setup_logging()
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_register_routes()
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app = create_app()
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socket_path = os.environ.get("VACUUM_WALLD_SOCKET", str(SOCKET_PATH))
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socket_dir = Path(socket_path).parent
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socket_dir.mkdir(parents=True, exist_ok=True)
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if Path(socket_path).exists():
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os.unlink(socket_path)
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loop = asyncio.new_event_loop()
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def _on_shutdown(_sig: int) -> None:
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logger.info("Shutting down daemon...")
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loop.stop()
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for sig in (signal.SIGTERM, signal.SIGINT):
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loop.add_signal_handler(sig, _on_shutdown, sig)
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runner = web.AppRunner(app)
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loop.run_until_complete(runner.setup())
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site = web.UnixSite(runner, socket_path)
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loop.run_until_complete(site.start())
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os.chmod(socket_path, 0o660)
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logger.info("vacuum-walld listening on %s", socket_path)
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try:
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loop.run_forever()
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finally:
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loop.run_until_complete(runner.cleanup())
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if Path(socket_path).exists():
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os.unlink(socket_path)
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logger.info("vacuum-walld stopped")
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if __name__ == "__main__":
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main()
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