refactor: overhaul daemon server, client, and handlers

daemon/handlers/logs.py

@@ -6,7 +6,14 @@ Reads system logs and journal entries.
 import logging
 from pathlib import Path
 
-from daemon.server import registry
+from daemon.iface import (
+    GET_LOGS_APP,
+    GET_LOGS_DNSMASQ,
+    GET_LOGS_JOURNAL,
+    GET_LOGS_NGINX_ACCESS,
+    GET_LOGS_NGINX_ERROR,
+)
+from daemon.server import NotFoundError, registry
 from lib.common import run_proc
 
 logger = logging.getLogger(__name__)
@@ -36,9 +43,9 @@ def _tail_file(path: str, n: int = _MAX_LINES, sudo: bool = False) -> str:
                 lines = f.readlines()
         return "".join(lines[-n:])
     except FileNotFoundError:
-        return "(log file not found)\n"
+        raise NotFoundError("log file not found") from None
     except PermissionError:
-        return "(permission denied)\n"
+        raise RuntimeError("permission denied") from None
 
 
 def _sudo_journalctl(unit: str, n: int = _MAX_LINES) -> str:
@@ -61,34 +68,34 @@ def _sudo_journalctl(unit: str, n: int = _MAX_LINES) -> str:
         output = result.stdout.strip()
         return output if output else f"(no journal entries for {unit})\n"
     except Exception as exc:
-        return f"(error reading journal: {exc})\n"
+        raise RuntimeError(f"error reading journal: {exc}") from exc
 
 
-@registry.register("GET", "/logs/journal")
+@registry.register(GET_LOGS_JOURNAL)
 def journal(_request, _body) -> str:
     """GET /logs/journal — return vacuum-wall daemon journal entries."""
     return _sudo_journalctl("vacuum-wall")
 
 
-@registry.register("GET", "/logs/nginx/access")
+@registry.register(GET_LOGS_NGINX_ACCESS)
 def nginx_access(_request, _body) -> str:
     """GET /logs/nginx/access — return recent nginx access log lines."""
     return _tail_file("/var/log/nginx/access.log", sudo=True)
 
 
-@registry.register("GET", "/logs/nginx/error")
+@registry.register(GET_LOGS_NGINX_ERROR)
 def nginx_error(_request, _body) -> str:
     """GET /logs/nginx/error — return recent nginx error log lines."""
     return _tail_file("/var/log/nginx/error.log", sudo=True)
 
 
-@registry.register("GET", "/logs/dnsmasq")
+@registry.register(GET_LOGS_DNSMASQ)
 def dnsmasq_log(_request, _body) -> str:
     """GET /logs/dnsmasq — return recent dnsmasq journal entries."""
     return _sudo_journalctl("dnsmasq")
 
 
-@registry.register("GET", "/logs/app")
+@registry.register(GET_LOGS_APP)
 def app_log(_request, _body) -> str:
     """GET /logs/app — return recent application log lines."""
     return _tail_file(str(_APP_LOG_FILE))