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Francisco Gamundi
committed
TypeInfo,
MaxEncodedLen,
serde::Serialize,
serde::Deserialize,
)]
#[cfg_attr(feature = "json-schema", derive(schemars::JsonSchema))]
#[scale_info(replace_segment("staging_xcm", "xcm"))]
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pub enum MultiAssetFilter {
/// Specify the filter as being everything contained by the given `MultiAssets` inner.
Definite(MultiAssets),
/// Specify the filter as the given `WildMultiAsset` wildcard.
Wild(WildMultiAsset),
}
impl<T: Into<WildMultiAsset>> From<T> for MultiAssetFilter {
fn from(x: T) -> Self {
Self::Wild(x.into())
}
}
impl From<MultiAsset> for MultiAssetFilter {
fn from(x: MultiAsset) -> Self {
Self::Definite(vec![x].into())
}
}
impl From<Vec<MultiAsset>> for MultiAssetFilter {
fn from(x: Vec<MultiAsset>) -> Self {
Self::Definite(x.into())
}
}
impl From<MultiAssets> for MultiAssetFilter {
fn from(x: MultiAssets) -> Self {
Self::Definite(x)
}
}
impl MultiAssetFilter {
/// Returns true if `inner` would be matched by `self`.
///
/// Note that for `Counted` variants of wildcards, then it will disregard the count except for
/// always returning `false` when equal to 0.
pub fn matches(&self, inner: &MultiAsset) -> bool {
match self {
MultiAssetFilter::Definite(ref assets) => assets.contains(inner),
MultiAssetFilter::Wild(ref wild) => wild.contains(inner),
}
}
/// Mutate the location of the asset identifier if concrete, giving it the same location
/// relative to a `target` context. The local context is provided as `context`.
pub fn reanchor(
&mut self,
target: &MultiLocation,
context: InteriorMultiLocation,
) -> Result<(), ()> {
match self {
MultiAssetFilter::Definite(ref mut assets) => assets.reanchor(target, context),
MultiAssetFilter::Wild(ref mut wild) => wild.reanchor(target, context),
}
}
/// Maximum count of assets it is possible to match, if known.
pub fn count(&self) -> Option<u32> {
use MultiAssetFilter::*;
match self {
Definite(x) => Some(x.len() as u32),
Wild(x) => x.count(),
}
}
/// Explicit limit placed on the number of items, if any.
pub fn limit(&self) -> Option<u32> {
use MultiAssetFilter::*;
match self {
Definite(_) => None,
Wild(x) => x.limit(),
}
}
}
impl TryFrom<OldMultiAssetFilter> for MultiAssetFilter {
type Error = ();
fn try_from(old: OldMultiAssetFilter) -> Result<MultiAssetFilter, ()> {
Ok(match old {
OldMultiAssetFilter::Definite(x) => Self::Definite(x.try_into()?),
OldMultiAssetFilter::Wild(x) => Self::Wild(x.try_into()?),
})
}
}
impl TryFrom<NewMultiAssetFilter> for MultiAssetFilter {
type Error = ();
fn try_from(new: NewMultiAssetFilter) -> Result<MultiAssetFilter, Self::Error> {
use NewMultiAssetFilter::*;
Ok(match new {
Definite(x) => Self::Definite(x.try_into()?),
Wild(x) => Self::Wild(x.try_into()?),
})
}
}
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impl TryFrom<(OldMultiAssetFilter, u32)> for MultiAssetFilter {
type Error = ();
fn try_from(old: (OldMultiAssetFilter, u32)) -> Result<MultiAssetFilter, ()> {
let count = old.1;
Ok(match old.0 {
OldMultiAssetFilter::Definite(x) if count >= x.len() as u32 =>
Self::Definite(x.try_into()?),
OldMultiAssetFilter::Wild(x) => Self::Wild((x, count).try_into()?),
_ => return Err(()),
})
}
}
#[cfg(test)]
mod tests {
use super::super::prelude::*;
#[test]
fn conversion_works() {
let _: MultiAssets = (Here, 1u128).into();
}
#[test]
fn from_sorted_and_deduplicated_works() {
use super::*;
use alloc::vec;
let empty = vec![];
let r = MultiAssets::from_sorted_and_deduplicated(empty);
assert_eq!(r, Ok(MultiAssets(vec![])));
let dup_fun = vec![(Here, 100).into(), (Here, 10).into()];
let r = MultiAssets::from_sorted_and_deduplicated(dup_fun);
assert!(r.is_err());
let dup_nft = vec![(Here, *b"notgood!").into(), (Here, *b"notgood!").into()];
let r = MultiAssets::from_sorted_and_deduplicated(dup_nft);
assert!(r.is_err());
let good_fun = vec![(Here, 10).into(), (Parent, 10).into()];
let r = MultiAssets::from_sorted_and_deduplicated(good_fun.clone());
assert_eq!(r, Ok(MultiAssets(good_fun)));
let bad_fun = vec![(Parent, 10).into(), (Here, 10).into()];
let r = MultiAssets::from_sorted_and_deduplicated(bad_fun);
assert!(r.is_err());
let good_abstract_fun = vec![(Here, 100).into(), ([0u8; 32], 10).into()];
let r = MultiAssets::from_sorted_and_deduplicated(good_abstract_fun.clone());
assert_eq!(r, Ok(MultiAssets(good_abstract_fun)));
let bad_abstract_fun = vec![([0u8; 32], 10).into(), (Here, 10).into()];
let r = MultiAssets::from_sorted_and_deduplicated(bad_abstract_fun);
assert!(r.is_err());
let good_nft = vec![(Here, ()).into(), (Here, *b"good").into()];
let r = MultiAssets::from_sorted_and_deduplicated(good_nft.clone());
assert_eq!(r, Ok(MultiAssets(good_nft)));
let bad_nft = vec![(Here, *b"bad!").into(), (Here, ()).into()];
let r = MultiAssets::from_sorted_and_deduplicated(bad_nft);
assert!(r.is_err());
let good_abstract_nft = vec![(Here, ()).into(), ([0u8; 32], ()).into()];
let r = MultiAssets::from_sorted_and_deduplicated(good_abstract_nft.clone());
assert_eq!(r, Ok(MultiAssets(good_abstract_nft)));
let bad_abstract_nft = vec![([0u8; 32], ()).into(), (Here, ()).into()];
let r = MultiAssets::from_sorted_and_deduplicated(bad_abstract_nft);
assert!(r.is_err());
let mixed_good = vec![(Here, 10).into(), (Here, *b"good").into()];
let r = MultiAssets::from_sorted_and_deduplicated(mixed_good.clone());
assert_eq!(r, Ok(MultiAssets(mixed_good)));
let mixed_bad = vec![(Here, *b"bad!").into(), (Here, 10).into()];
let r = MultiAssets::from_sorted_and_deduplicated(mixed_bad);
assert!(r.is_err());
}
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#[test]
fn reanchor_preserves_sorting() {
use super::*;
use alloc::vec;
let reanchor_context = X1(Parachain(2000));
let dest = MultiLocation::new(1, Here);
let asset_1: MultiAsset =
(MultiLocation::new(0, X2(PalletInstance(50), GeneralIndex(1))), 10).into();
let mut asset_1_reanchored = asset_1.clone();
assert!(asset_1_reanchored.reanchor(&dest, reanchor_context).is_ok());
assert_eq!(
asset_1_reanchored,
(MultiLocation::new(0, X3(Parachain(2000), PalletInstance(50), GeneralIndex(1))), 10)
.into()
);
let asset_2: MultiAsset = (MultiLocation::new(1, Here), 10).into();
let mut asset_2_reanchored = asset_2.clone();
assert!(asset_2_reanchored.reanchor(&dest, reanchor_context).is_ok());
assert_eq!(asset_2_reanchored, (MultiLocation::new(0, Here), 10).into());
let asset_3: MultiAsset = (MultiLocation::new(1, X1(Parachain(1000))), 10).into();
let mut asset_3_reanchored = asset_3.clone();
assert!(asset_3_reanchored.reanchor(&dest, reanchor_context).is_ok());
assert_eq!(asset_3_reanchored, (MultiLocation::new(0, X1(Parachain(1000))), 10).into());
let mut assets: MultiAssets =
vec![asset_1.clone(), asset_2.clone(), asset_3.clone()].into();
assert_eq!(assets.clone(), vec![asset_1.clone(), asset_2.clone(), asset_3.clone()].into());
assert!(assets.reanchor(&dest, reanchor_context).is_ok());
assert_eq!(assets, vec![asset_2_reanchored, asset_3_reanchored, asset_1_reanchored].into());
}
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#[test]
fn decoding_respects_limit() {
use super::*;
// Having lots of one asset will work since they are deduplicated
let lots_of_one_asset: MultiAssets =
vec![(GeneralIndex(1), 1u128).into(); MAX_ITEMS_IN_MULTIASSETS + 1].into();
let encoded = lots_of_one_asset.encode();
assert!(MultiAssets::decode(&mut &encoded[..]).is_ok());
// Fewer assets than the limit works
let mut few_assets: MultiAssets = Vec::new().into();
for i in 0..MAX_ITEMS_IN_MULTIASSETS {
few_assets.push((GeneralIndex(i as u128), 1u128).into());
}
let encoded = few_assets.encode();
assert!(MultiAssets::decode(&mut &encoded[..]).is_ok());
// Having lots of different assets will not work
let mut too_many_different_assets: MultiAssets = Vec::new().into();
for i in 0..MAX_ITEMS_IN_MULTIASSETS + 1 {
too_many_different_assets.push((GeneralIndex(i as u128), 1u128).into());
}
let encoded = too_many_different_assets.encode();
assert!(MultiAssets::decode(&mut &encoded[..]).is_err());
}