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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,244 @@ | ||
| use crate::{AssetId, PalletIndex}; | ||
| use std::marker::PhantomData; | ||
| use subxt::ext::{ | ||
| codec::{Encode, Output}, | ||
| scale_decode::{ | ||
| self, | ||
| error::ErrorKind, | ||
| visitor::{ | ||
| types::{Composite, Tuple}, | ||
| TypeIdFor, | ||
| }, | ||
| DecodeAsType, IntoVisitor, TypeResolver, Visitor, | ||
| }, | ||
| scale_encode::{self, EncodeAsType}, | ||
| }; | ||
|
|
||
| #[derive(Clone, Debug)] | ||
| pub enum Asset { | ||
| Id(AssetId), | ||
| MultiLocation(PalletIndex, AssetId), | ||
| } | ||
|
|
||
| impl Asset { | ||
| const ID: &'static str = "Id"; | ||
| const MULTI_LOCATION: &'static str = "MultiLocation"; | ||
| } | ||
|
|
||
| pub struct AssetVisitor<R>(PhantomData<R>); | ||
|
|
||
| fn try_into_asset_id( | ||
| number: impl TryInto<AssetId> + ToString + Copy, | ||
| ) -> Result<AssetId, scale_decode::Error> { | ||
| number.try_into().map_err(|_| { | ||
| scale_decode::Error::new(ErrorKind::NumberOutOfRange { | ||
| value: number.to_string(), | ||
| }) | ||
| }) | ||
| } | ||
|
|
||
| macro_rules! visit_number { | ||
| ($visit:ident, $number:ty) => { | ||
| fn $visit<'scale, 'resolver>( | ||
| self, | ||
| number: $number, | ||
| type_id: &TypeIdFor<Self>, | ||
| ) -> Result<Self::Value<'scale, 'resolver>, Self::Error> { | ||
| self.visit_u32(try_into_asset_id(number)?, type_id) | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| macro_rules! visit_composite_or_tuple { | ||
| ($visit:ident, $composite_or_tuple:ident) => { | ||
| fn $visit<'scale, 'resolver>( | ||
| self, | ||
| composite_or_tuple: &mut $composite_or_tuple<'scale, 'resolver, Self::TypeResolver>, | ||
| type_id: &TypeIdFor<Self>, | ||
| ) -> Result<Self::Value<'scale, 'resolver>, Self::Error> { | ||
| if composite_or_tuple.remaining() == 1 { | ||
| // Shouldn't panic. We've just checked remaining items above. | ||
| return composite_or_tuple | ||
| .decode_item(self) | ||
| .unwrap() | ||
| .map_err(|error| error.at_variant(Self::Value::ID)); | ||
| } | ||
|
|
||
| let (pallet_index, asset_id) = (|| { | ||
| let MultiLocation { | ||
| interior: Junctions::X2(first, second), | ||
| .. | ||
| } = MultiLocation::into_visitor().$visit(composite_or_tuple, type_id)?; | ||
|
|
||
| let Junction::PalletInstance(pallet_index) = first else { | ||
| return Err(scale_decode::Error::new(ErrorKind::CannotFindVariant { | ||
| got: first.name().into(), | ||
| expected: vec![Junction::PALLET_INSTANCE], | ||
| }) | ||
| .at_idx(0)); | ||
| }; | ||
|
|
||
| let asset_id = (|| { | ||
| let Junction::GeneralIndex(general_index) = second else { | ||
| return Err(scale_decode::Error::new(ErrorKind::CannotFindVariant { | ||
| got: first.name().into(), | ||
| expected: vec![Junction::GENERAL_INDEX], | ||
| })); | ||
| }; | ||
|
|
||
| let asset_id = general_index.try_into().map_err(|_| { | ||
| scale_decode::Error::new(ErrorKind::NumberOutOfRange { | ||
| value: general_index.to_string(), | ||
| }) | ||
| })?; | ||
|
|
||
| Ok(asset_id) | ||
| })() | ||
| .map_err(|error| error.at_idx(1))?; | ||
|
|
||
| Ok((pallet_index, asset_id)) | ||
| })() | ||
| .map_err(|error| error.at_variant(Self::Value::MULTI_LOCATION))?; | ||
|
|
||
| Ok(Self::Value::MultiLocation(pallet_index, asset_id)) | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| impl<R: TypeResolver> Visitor for AssetVisitor<R> { | ||
| type Value<'scale, 'resolver> = Asset; | ||
| type Error = scale_decode::Error; | ||
| type TypeResolver = R; | ||
|
|
||
| fn visit_u32<'scale, 'resolver>( | ||
| self, | ||
| value: u32, | ||
| _: &TypeIdFor<Self>, | ||
| ) -> Result<Self::Value<'scale, 'resolver>, Self::Error> { | ||
| Ok(Self::Value::Id(value)) | ||
| } | ||
|
|
||
| fn visit_u8<'scale, 'resolver>( | ||
| self, | ||
| value: u8, | ||
| type_id: &TypeIdFor<Self>, | ||
| ) -> Result<Self::Value<'scale, 'resolver>, Self::Error> { | ||
| self.visit_u32(value.into(), type_id) | ||
| } | ||
|
|
||
| fn visit_u16<'scale, 'resolver>( | ||
| self, | ||
| value: u16, | ||
| type_id: &TypeIdFor<Self>, | ||
| ) -> Result<Self::Value<'scale, 'resolver>, Self::Error> { | ||
| self.visit_u32(value.into(), type_id) | ||
| } | ||
|
|
||
| visit_number!(visit_i8, i8); | ||
| visit_number!(visit_i16, i16); | ||
| visit_number!(visit_i32, i32); | ||
| visit_number!(visit_u64, u64); | ||
| visit_number!(visit_i64, i64); | ||
| visit_number!(visit_i128, i128); | ||
| visit_number!(visit_u128, u128); | ||
|
|
||
| visit_composite_or_tuple!(visit_tuple, Tuple); | ||
| visit_composite_or_tuple!(visit_composite, Composite); | ||
| } | ||
|
|
||
| impl IntoVisitor for Asset { | ||
| type AnyVisitor<R: TypeResolver> = AssetVisitor<R>; | ||
|
|
||
| fn into_visitor<R: TypeResolver>() -> Self::AnyVisitor<R> { | ||
| AssetVisitor(PhantomData) | ||
| } | ||
| } | ||
|
|
||
| impl EncodeAsType for Asset { | ||
| fn encode_as_type_to<R: TypeResolver>( | ||
| &self, | ||
| type_id: &R::TypeId, | ||
| types: &R, | ||
| out: &mut Vec<u8>, | ||
| ) -> Result<(), scale_encode::Error> { | ||
| match self { | ||
| Self::Id(id) => id.encode_as_type_to(type_id, types, out), | ||
| Self::MultiLocation(assets_pallet, asset_id) => { | ||
| MultiLocation::new(*assets_pallet, *asset_id).encode_as_type_to(type_id, types, out) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Encode for Asset { | ||
| fn size_hint(&self) -> usize { | ||
| match self { | ||
| Self::Id(id) => id.size_hint(), | ||
| Self::MultiLocation(assets_pallet, asset_id) => { | ||
| MultiLocation::new(*assets_pallet, *asset_id).size_hint() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn encode_to<T: Output + ?Sized>(&self, dest: &mut T) { | ||
| match self { | ||
| Self::Id(id) => id.encode_to(dest), | ||
| Self::MultiLocation(assets_pallet, asset_id) => { | ||
| MultiLocation::new(*assets_pallet, *asset_id).encode_to(dest); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[derive(EncodeAsType, DecodeAsType, Encode)] | ||
| #[encode_as_type(crate_path = "subxt::ext::scale_encode")] | ||
| #[decode_as_type(crate_path = "subxt::ext::scale_decode")] | ||
| #[codec(crate = subxt::ext::codec)] | ||
| struct MultiLocation { | ||
| parents: u8, | ||
| interior: Junctions, | ||
| } | ||
|
|
||
| impl MultiLocation { | ||
| fn new(assets_pallet: PalletIndex, asset_id: AssetId) -> Self { | ||
| Self { | ||
| parents: 0, | ||
| interior: Junctions::X2( | ||
| Junction::PalletInstance(assets_pallet), | ||
| Junction::GeneralIndex(asset_id.into()), | ||
| ), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[derive(EncodeAsType, DecodeAsType, Encode)] | ||
| #[encode_as_type(crate_path = "subxt::ext::scale_encode")] | ||
| #[decode_as_type(crate_path = "subxt::ext::scale_decode")] | ||
| #[codec(crate = subxt::ext::codec)] | ||
| enum Junctions { | ||
| #[codec(index = 2)] | ||
| X2(Junction, Junction), | ||
| } | ||
|
|
||
| #[derive(EncodeAsType, DecodeAsType, Encode)] | ||
| #[encode_as_type(crate_path = "subxt::ext::scale_encode")] | ||
| #[decode_as_type(crate_path = "subxt::ext::scale_decode")] | ||
| #[codec(crate = subxt::ext::codec)] | ||
| enum Junction { | ||
| #[codec(index = 4)] | ||
| PalletInstance(PalletIndex), | ||
| #[codec(index = 5)] | ||
| GeneralIndex(u128), | ||
| } | ||
|
|
||
| impl Junction { | ||
| const PALLET_INSTANCE: &'static str = "PalletInstance"; | ||
| const GENERAL_INDEX: &'static str = "GeneralIndex"; | ||
|
|
||
| fn name(&self) -> &str { | ||
| match self { | ||
| Self::PalletInstance(_) => Self::PALLET_INSTANCE, | ||
| Self::GeneralIndex(_) => Self::GENERAL_INDEX, | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1 @@ | ||
|
|
||
| pub const MODULE: &str = module_path!(); |
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