[XCM] Make NetworkId and Junction versioned (#7376)

* [XCM] Make NetworkId and Junction versioned

* Fixes

---------

Co-authored-by: parity-processbot <>

polkadot/xcm/src/lib.rs

@@ -242,6 +242,26 @@ versioned_type! {
 	}
 }
 
+versioned_type! {
+	/// A single `NetworkId` value, together with its version code.
+	pub enum VersionedNetworkId {
+		#[codec(index = 2)]
+		V2(v2::NetworkId),
+		#[codec(index = 3)]
+		V3(v3::NetworkId),
+	}
+}
+
+versioned_type! {
+	/// A single `Junction` value, together with its version code.
+	pub enum VersionedJunction {
+		#[codec(index = 2)]
+		V2(v2::Junction),
+		#[codec(index = 3)]
+		V3(v3::Junction),
+	}
+}
+
 versioned_type! {
 	/// A single `MultiLocation` value, together with its version code.
 	#[derive(Ord, PartialOrd)]

polkadot/xcm/src/v2/mod.rs

@@ -117,16 +117,25 @@ pub enum NetworkId {
 	Kusama,
 }
 
-impl TryInto<NetworkId> for Option<NewNetworkId> {
+impl TryFrom<Option<NewNetworkId>> for NetworkId {
 	type Error = ();
-	fn try_into(self) -> result::Result<NetworkId, ()> {
+	fn try_from(new: Option<NewNetworkId>) -> result::Result<NetworkId, ()> {
+		match new {
+			None => Ok(NetworkId::Any),
+			Some(id) => Self::try_from(id),
+		}
+	}
+}
+
+impl TryFrom<NewNetworkId> for NetworkId {
+	type Error = ();
+	fn try_from(new: NewNetworkId) -> result::Result<NetworkId, ()> {
 		use NewNetworkId::*;
-		Ok(match self {
-			None => NetworkId::Any,
-			Some(Polkadot) => NetworkId::Polkadot,
-			Some(Kusama) => NetworkId::Kusama,
-			_ => return Err(()),
-		})
+		match new {
+			Polkadot => Ok(NetworkId::Polkadot),
+			Kusama => Ok(NetworkId::Kusama),
+			_ => Err(()),
+		}
 	}
 }
 

polkadot/xcm/src/v3/junction.rs

@@ -88,6 +88,18 @@ impl From<OldNetworkId> for Option<NetworkId> {
 	}
 }
 
+impl TryFrom<OldNetworkId> for NetworkId {
+	type Error = ();
+	fn try_from(old: OldNetworkId) -> Result<Self, Self::Error> {
+		use OldNetworkId::*;
+		match old {
+			Any | Named(_) => Err(()),
+			Polkadot => Ok(NetworkId::Polkadot),
+			Kusama => Ok(NetworkId::Kusama),
+		}
+	}
+}
+
 /// An identifier of a pluralistic body.
 #[derive(
 	Copy,