Atproto, add sqlx support

atproto/src/lib.rs

@@ -1,3 +1,5 @@
 pub mod lexicons;
 pub mod types;
 pub mod error;
+#[cfg(feature = "sqlx-support")]
+pub mod sqlx;

atproto/src/sqlx.rs

@@ -0,0 +1,38 @@
+use crate::types::{
+  Did,
+  Cid,
+  Uri,
+  Handle,
+  Datetime,
+};
+
+macro_rules! implement_sqlx_for_string_type {
+  ($name:ident) => {
+    impl sqlx::Type<sqlx::Postgres> for $name {
+      fn type_info() -> sqlx::postgres::PgTypeInfo {
+        <String as sqlx::Type<sqlx::Postgres>>::type_info()
+      }
+    }
+    impl<'q> sqlx::Encode<'q, sqlx::Postgres> for $name {
+      fn encode_by_ref(
+        &self, buf: &mut sqlx::postgres::PgArgumentBuffer
+      ) -> Result<sqlx::encode::IsNull, sqlx::error::BoxDynError> {
+        <String as sqlx::Encode<sqlx::Postgres>>::encode_by_ref(&self.to_string(), buf)
+      }
+    }
+    impl<'r> sqlx::Decode<'r, sqlx::Postgres> for $name {
+      fn decode(
+        value: sqlx::postgres::PgValueRef<'r>
+      ) -> Result<Self, sqlx::error::BoxDynError> {
+        let s = <String as sqlx::Decode<sqlx::Postgres>>::decode(value)?;
+        s.parse::<$name>().map_err(|e| Box::new(e) as sqlx::error::BoxDynError)
+      }
+    }
+  }
+}
+
+implement_sqlx_for_string_type!(Did);
+implement_sqlx_for_string_type!(Cid);
+implement_sqlx_for_string_type!(Uri);
+implement_sqlx_for_string_type!(Handle);
+implement_sqlx_for_string_type!(Datetime);