fix(syslog_bridge): rewrite both templates with from __future__ annotations, fp socket imports, and start_fp_socket_reader

decnet/templates/https/syslog_bridge.py

@@ -16,7 +16,11 @@ from __future__ import annotations
 
 import base64
 import binascii
+import json as _json
+import os as _os
 import re
+import socket as _socket
+import threading as _threading
 from datetime import datetime, timezone
 from typing import Any, Optional
 
@@ -66,7 +70,7 @@ def syslog_line(
     Return a single RFC 5424-compliant syslog line (no trailing newline).
 
     Args:
-        service:    APP-NAME (e.g. "http", "mysql")
+        service:    APP-NAME (e.g. "http", "ssh")
         hostname:   HOSTNAME (node name)
         event_type: MSGID    (e.g. "request", "login_attempt")
         severity:   Syslog severity integer (default: INFO=6)
@@ -223,16 +227,12 @@ def extract_form_credentials(
         if "=" not in pair:
             continue
         k, _, v = pair.partition("=")
-        # urllib decode without importing urllib at module scope (the
-        # template emitters are import-cost-sensitive). Inline the
-        # tiny percent-decode + plus-decode.
         try:
             from urllib.parse import unquote_plus
             key = unquote_plus(k).lower()
             val = unquote_plus(v)
         except Exception:
             continue
-        # First-wins so duplicate-key forms don't get clobbered.
         fields.setdefault(key, val)
 
     principal: Optional[str] = None
@@ -262,3 +262,56 @@ def write_syslog_file(line: str) -> None:
 def forward_syslog(line: str, log_target: str) -> None:
     """No-op stub. TCP forwarding is handled by rsyslog, not by service containers."""
     pass
+
+
+# ─── Caddy fingerprint socket reader ─────────────────────────────────────────
+
+_FP_BUF = 65536
+
+
+def _fp_socket_reader(node_name: str, service_name: str, log_target: str) -> None:
+    sock_path = _os.environ.get("DECNET_FP_SOCK", "/run/decnet/fp.sock")
+    try:
+        sock = _socket.socket(_socket.AF_UNIX, _socket.SOCK_DGRAM)
+        sock.bind(sock_path)
+    except OSError:
+        return
+    while True:
+        try:
+            data = sock.recv(_FP_BUF)
+            record = _json.loads(data)
+        except (OSError, ValueError):
+            continue
+        kind = record.get("kind", "")
+        remote = record.get("remote_addr", "-")
+        if kind == "h2_settings":
+            ln = syslog_line(
+                service_name, node_name, "http2_settings", SEVERITY_INFO,
+                remote_addr=remote,
+                settings=_json.dumps(record.get("settings", {})),
+                frame_order=_json.dumps(record.get("frame_order", [])),
+            )
+            write_syslog_file(ln)
+            if log_target:
+                forward_syslog(ln, log_target)
+        elif kind == "http_request":
+            ln = syslog_line(
+                service_name, node_name, "http_request_fingerprint", SEVERITY_INFO,
+                remote_addr=remote,
+                proto=record.get("proto_tag", "-"),
+                headers_ordered=_json.dumps(record.get("headers_ordered", [])),
+                cookie=record.get("cookie", ""),
+                accept_language=record.get("accept_language", ""),
+            )
+            write_syslog_file(ln)
+            if log_target:
+                forward_syslog(ln, log_target)
+
+
+def start_fp_socket_reader(node_name: str, service_name: str, log_target: str) -> None:
+    t = _threading.Thread(
+        target=_fp_socket_reader,
+        args=(node_name, service_name, log_target),
+        daemon=True,
+    )
+    t.start()