mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Kian Paimani
8a8b4f99c3
* Rename and move sp-phragmen * More renames for equalise * Update main module doc * Fix line width * Line width
100 lines
2.7 KiB
Rust
100 lines
2.7 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2020 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Helper methods for npos-elections.
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use crate::{Assignment, ExtendedBalance, VoteWeight, IdentifierT, StakedAssignment, WithApprovalOf};
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use sp_arithmetic::PerThing;
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use sp_std::prelude::*;
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/// Converts a vector of ratio assignments into ones with absolute budget value.
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pub fn assignment_ratio_to_staked<A: IdentifierT, T: PerThing, FS>(
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ratio: Vec<Assignment<A, T>>,
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stake_of: FS,
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) -> Vec<StakedAssignment<A>>
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where
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for<'r> FS: Fn(&'r A) -> VoteWeight,
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T: sp_std::ops::Mul<ExtendedBalance, Output = ExtendedBalance>,
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ExtendedBalance: From<<T as PerThing>::Inner>,
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{
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ratio
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.into_iter()
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.map(|a| {
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let stake = stake_of(&a.who);
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a.into_staked(stake.into(), true)
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})
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.collect()
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}
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/// Converts a vector of staked assignments into ones with ratio values.
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pub fn assignment_staked_to_ratio<A: IdentifierT, T: PerThing>(
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staked: Vec<StakedAssignment<A>>,
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) -> Vec<Assignment<A, T>>
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where
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ExtendedBalance: From<<T as PerThing>::Inner>,
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{
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staked.into_iter().map(|a| a.into_assignment(true)).collect()
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}
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/// consumes a vector of winners with backing stake to just winners.
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pub fn to_without_backing<A: IdentifierT>(winners: Vec<WithApprovalOf<A>>) -> Vec<A> {
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winners.into_iter().map(|(who, _)| who).collect::<Vec<A>>()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use sp_arithmetic::Perbill;
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#[test]
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fn into_staked_works() {
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let assignments = vec![
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Assignment {
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who: 1u32,
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distribution: vec![
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(10u32, Perbill::from_fraction(0.5)),
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(20, Perbill::from_fraction(0.5)),
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],
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},
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Assignment {
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who: 2u32,
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distribution: vec![
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(10, Perbill::from_fraction(0.33)),
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(20, Perbill::from_fraction(0.67)),
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],
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},
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];
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let stake_of = |_: &u32| -> VoteWeight { 100 };
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let staked = assignment_ratio_to_staked(assignments, stake_of);
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assert_eq!(
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staked,
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vec![
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StakedAssignment {
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who: 1u32,
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distribution: vec![(10u32, 50), (20, 50),]
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},
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StakedAssignment {
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who: 2u32,
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distribution: vec![(10u32, 33), (20, 67),]
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}
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]
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);
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}
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}
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