Add support for IpAddr (#1822)

sqlx-core/src/postgres/types/ipaddr.rs

@@ -0,0 +1,62 @@
+use std::net::IpAddr;
+
+use ipnetwork::IpNetwork;
+
+use crate::decode::Decode;
+use crate::encode::{Encode, IsNull};
+use crate::error::BoxDynError;
+use crate::postgres::{PgArgumentBuffer, PgHasArrayType, PgTypeInfo, PgValueRef, Postgres};
+use crate::types::Type;
+
+impl Type<Postgres> for IpAddr
+where
+    IpNetwork: Type<Postgres>,
+{
+    fn type_info() -> PgTypeInfo {
+        IpNetwork::type_info()
+    }
+
+    fn compatible(ty: &PgTypeInfo) -> bool {
+        IpNetwork::compatible(ty)
+    }
+}
+
+impl PgHasArrayType for IpAddr {
+    fn array_type_info() -> PgTypeInfo {
+        <IpNetwork as PgHasArrayType>::array_type_info()
+    }
+
+    fn array_compatible(ty: &PgTypeInfo) -> bool {
+        <IpNetwork as PgHasArrayType>::array_compatible(ty)
+    }
+}
+
+impl<'db> Encode<'db, Postgres> for IpAddr
+where
+    IpNetwork: Encode<'db, Postgres>,
+{
+    fn encode_by_ref(&self, buf: &mut PgArgumentBuffer) -> IsNull {
+        IpNetwork::from(*self).encode_by_ref(buf)
+    }
+
+    fn size_hint(&self) -> usize {
+        IpNetwork::from(*self).size_hint()
+    }
+}
+
+impl<'db> Decode<'db, Postgres> for IpAddr
+where
+    IpNetwork: Decode<'db, Postgres>,
+{
+    fn decode(value: PgValueRef<'db>) -> Result<Self, BoxDynError> {
+        let ipnetwork = IpNetwork::decode(value)?;
+
+        if ipnetwork.is_ipv4() && ipnetwork.prefix() != 32
+            || ipnetwork.is_ipv6() && ipnetwork.prefix() != 128
+        {
+            Err("lossy decode from inet/cidr")?
+        }
+
+        Ok(ipnetwork.ip())
+    }
+}

sqlx-core/src/postgres/types/mod.rs

@@ -205,6 +205,9 @@ mod json;
 #[cfg(feature = "ipnetwork")]
 mod ipnetwork;
 
+#[cfg(feature = "ipnetwork")]
+mod ipaddr;
+
 #[cfg(feature = "mac_address")]
 mod mac_address;