chore(nft): Readability

firewall.py

@@ -209,16 +209,16 @@ def resolve_zones(yaml_zones: dict[ZoneName, ZoneEntry]) -> Zones:
 
 def split_v4_v6(
     addrs: Generator[IPvAnyNetwork, None, None]
-) -> tuple[set[IPv4Network], set[IPv6Network]]:
+) -> tuple[set[nft.Immediate[IPv4Network]], set[nft.Immediate[IPv6Network]]]:
     v4, v6 = set(), set()
 
     for addr in addrs:
         match addr:
             case IPv4Network():
-                v4.add(addr)
+                v4.add(nft.Immediate(addr))
 
             case IPv6Network():
-                v6.add(addr)
+                v6.add(nft.Immediate(addr))
 
     return v4, v6
 
@@ -335,11 +335,11 @@ def main() -> int:
         print(f"Zone resolution failed: {e}")
         return 1
 
-    # try:
+    try:
         json = parse_firewall(firewall, zones)
-    # except Exception as e:
-    #    print(f"Firewall translation failed: {e}")
-    #    return 1
+    except Exception as e:
+        print(f"Firewall translation failed: {e}")
+        return 1
 
     return send_to_nftables(json.to_nft())
 

nft.py

@@ -1,7 +1,7 @@
 from dataclasses import dataclass, field
 from itertools import chain
-from pydantic import IPvAnyNetwork
-from typing import Any, TypeVar
+from ipaddress import IPv4Network, IPv6Network
+from typing import Any, Generic, TypeVar
 
 T = TypeVar("T")
 JsonNftables = dict[str, Any]
@@ -11,38 +11,20 @@ def flatten(l: list[list[T]]) -> list[T]:
     return list(chain.from_iterable(l))
 
 
-def ip_to_nft(ip: IPvAnyNetwork) -> JsonNftables:
+def ip_to_nft(ip: IPv4Network | IPv6Network) -> JsonNftables:
     return {"prefix": {"addr": str(ip.network_address), "len": ip.prefixlen}}
 
 
-@dataclass
-class Set:
-    name: str
-    flags: list[str]
-    type: str | list[str]
+@dataclass(eq=True, frozen=True)
+class Immediate(Generic[T]):
+    value: T
 
-    elements: list[IPvAnyNetwork] = field(default_factory=list)
+    def to_nft(self) -> Any:
+        if isinstance(self.value, IPv4Network) or isinstance(
+            self.value, IPv6Network
+        ):
+            return ip_to_nft(self.value)
 
-    def to_nft(self, family: str, table: str) -> JsonNftables:
-        set: JsonNftables = {
-            "name": self.name,
-            "family": family,
-            "table": table,
-            "flags": self.flags,
-            "type": self.type,
-        }
-
-        if self.elements:
-            set["elem"] = [ip_to_nft(ip) for ip in self.elements]
-
-        return {"add": {"set": set}}
-
-
-@dataclass
-class Immediate:
-    value: str
-
-    def to_nft(self) -> str:
         return self.value
 
 
@@ -75,33 +57,54 @@ class Match:
     right: Expression
 
     def to_nft(self) -> JsonNftables:
-        return {
-            "match": {
+        match = {
             "op": self.op,
             "left": self.left.to_nft(),
             "right": self.right.to_nft(),
         }
-        }
+
+        return {"match": match}
 
 
 Statement = Verdict | Match
 
 
+@dataclass
+class Set:
+    name: str
+    flags: list[str]
+    type: str | list[str]
+
+    elements: list[Immediate] = field(default_factory=list)
+
+    def to_nft(self, family: str, table: str) -> JsonNftables:
+        set: JsonNftables = {
+            "name": self.name,
+            "family": family,
+            "table": table,
+            "flags": self.flags,
+            "type": self.type,
+        }
+
+        if self.elements:
+            set["elem"] = [element.to_nft() for element in self.elements]
+
+        return {"add": {"set": set}}
+
+
 @dataclass
 class Rule:
     stmts: list[Statement]
 
     def to_nft(self, family: str, table: str, chain: str) -> JsonNftables:
-        return {
-            "add": {
-                "rule": {
+        rule = {
             "family": family,
             "table": table,
             "chain": chain,
             "expr": [stmt.to_nft() for stmt in self.stmts],
         }
-            }
-        }
+
+        return {"add": {"rule": rule}}
 
 
 @dataclass
@@ -151,7 +154,9 @@ class Table:
     sets: list[Set] = field(default_factory=list)
 
     def to_nft(self) -> list[JsonNftables]:
-        commands = [{"add": {"table": {"family": self.family, "name": self.name}}}]
+        commands = [
+            {"add": {"table": {"family": self.family, "name": self.name}}}
+        ]
 
         for set in self.sets:
             commands.append(set.to_nft(self.family, self.name))