Fix all ruff lint errors across decnet/, templates/, and tests/

templates/snmp/server.py

@@ -7,11 +7,8 @@ Logs all requests as JSON.
 """
 
 import asyncio
-import json
 import os
-import socket
 import struct
-from datetime import datetime, timezone
 from decnet_logging import syslog_line, write_syslog_file, forward_syslog
 
 NODE_NAME = os.environ.get("NODE_NAME", "switch")
@@ -94,35 +91,46 @@ def _ber_tlv(tag: int, value: bytes) -> bytes:
 def _parse_snmp(data: bytes):
     """Return (version, community, request_id, oids) or raise."""
     pos = 0
-    assert data[pos] == 0x30; pos += 1
+    assert data[pos] == 0x30
+    pos += 1
     _, pos = _read_ber_length(data, pos)
     # version
-    assert data[pos] == 0x02; pos += 1
+    assert data[pos] == 0x02
+    pos += 1
     v_len, pos = _read_ber_length(data, pos)
-    version = int.from_bytes(data[pos:pos + v_len], "big"); pos += v_len
+    version = int.from_bytes(data[pos:pos + v_len], "big")
+    pos += v_len
     # community
-    assert data[pos] == 0x04; pos += 1
+    assert data[pos] == 0x04
+    pos += 1
     c_len, pos = _read_ber_length(data, pos)
-    community = data[pos:pos + c_len].decode(errors="replace"); pos += c_len
+    community = data[pos:pos + c_len].decode(errors="replace")
+    pos += c_len
     # PDU type (0xa0 = GetRequest, 0xa1 = GetNextRequest)
-    pdu_type = data[pos]; pos += 1
+    pos += 1
     _, pos = _read_ber_length(data, pos)
     # request-id
-    assert data[pos] == 0x02; pos += 1
+    assert data[pos] == 0x02
+    pos += 1
     r_len, pos = _read_ber_length(data, pos)
-    request_id = int.from_bytes(data[pos:pos + r_len], "big"); pos += r_len
+    request_id = int.from_bytes(data[pos:pos + r_len], "big")
+    pos += r_len
     pos += 4  # skip error-status and error-index
     # varbind list
-    assert data[pos] == 0x30; pos += 1
+    assert data[pos] == 0x30
+    pos += 1
     vbl_len, pos = _read_ber_length(data, pos)
     end = pos + vbl_len
     oids = []
     while pos < end:
-        assert data[pos] == 0x30; pos += 1
+        assert data[pos] == 0x30
+        pos += 1
         vb_len, pos = _read_ber_length(data, pos)
-        assert data[pos] == 0x06; pos += 1
+        assert data[pos] == 0x06
+        pos += 1
         oid_len, pos = _read_ber_length(data, pos)
-        oid = _decode_oid(data[pos:pos + oid_len]); pos += oid_len
+        oid = _decode_oid(data[pos:pos + oid_len])
+        pos += oid_len
         oids.append(oid)
         pos += vb_len - oid_len - 2  # skip value
     return version, community, request_id, oids