mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-26 20:27:58 +00:00
Francisco Aguirre
c130ea9939
The XCM builder pattern lets you build xcms like so:
```rust
let xcm = Xcm::builder()
.withdraw_asset((Parent, 100u128).into())
.buy_execution((Parent, 1u128).into())
.deposit_asset(All.into(), AccountId32 { id: [0u8; 32], network: None }.into())
.build();
```
All the `.into()` become quite annoying to have to write.
I accepted `impl Into<T>` instead of `T` in the generated methods from
the macro.
Now the previous example can be simplified as follows:
```rust
let xcm = Xcm::builder()
.withdraw_asset((Parent, 100u128))
.buy_execution((Parent, 1u128))
.deposit_asset(All, [0u8; 32])
.build();
```
---------
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: command-bot <>
Co-authored-by: Adrian Catangiu <adrian@parity.io>
82 lines
2.8 KiB
Rust
82 lines
2.8 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Polkadot is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! Test the methods generated by the Builder derive macro.
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//! Tests directly on the actual Xcm struct and Instruction enum.
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use xcm::latest::prelude::*;
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#[test]
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fn builder_pattern_works() {
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let asset: Asset = (Here, 100u128).into();
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let beneficiary: Location = [0u8; 32].into();
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let message: Xcm<()> = Xcm::builder()
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.receive_teleported_asset(asset.clone())
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.buy_execution(asset.clone(), Unlimited)
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.deposit_asset(asset.clone(), beneficiary.clone())
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.build();
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assert_eq!(
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message,
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Xcm(vec![
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ReceiveTeleportedAsset(asset.clone().into()),
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BuyExecution { fees: asset.clone(), weight_limit: Unlimited },
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DepositAsset { assets: asset.into(), beneficiary },
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])
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);
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}
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#[test]
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fn default_builder_requires_buy_execution() {
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let asset: Asset = (Here, 100u128).into();
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let beneficiary: Location = AccountId32 { id: [0u8; 32], network: None }.into();
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// This is invalid, since it doesn't pay for fees.
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// This is enforced by the runtime, because the build() method doesn't exist
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// on the resulting type.
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// let message: Xcm<()> = Xcm::builder()
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// .withdraw_asset(asset.clone().into())
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// .deposit_asset(asset.into(), beneficiary)
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// .build();
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// To be able to do that, we need to use the explicitly unpaid variant
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let message: Xcm<()> = Xcm::builder_unpaid()
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.unpaid_execution(Unlimited, None)
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.withdraw_asset(asset.clone())
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.deposit_asset(asset.clone(), beneficiary.clone())
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.build(); // This works
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assert_eq!(
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message,
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Xcm(vec![
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UnpaidExecution { weight_limit: Unlimited, check_origin: None },
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WithdrawAsset(asset.clone().into()),
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DepositAsset { assets: asset.clone().into(), beneficiary: beneficiary.clone() },
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])
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);
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// The other option doesn't have any limits whatsoever, so it should
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// only be used when you really know what you're doing.
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let message: Xcm<()> = Xcm::builder_unsafe()
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.withdraw_asset(asset.clone())
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.deposit_asset(asset.clone(), beneficiary.clone())
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.build();
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assert_eq!(
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message,
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Xcm(vec![
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WithdrawAsset(asset.clone().into()),
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DepositAsset { assets: asset.clone().into(), beneficiary },
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])
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);
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}
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