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Make staking inflation curve configurable. (#3644)

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* Draft for new design of NPoS rewards

* finish code

* fix test

* add tests

* improve log test

* version bump

* Update srml/staking/reward-curve/Cargo.toml

Co-Authored-By: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* u128 -> u64

* make conversion to smaller type safe

* Update core/sr-primitives/src/curve.rs

Co-Authored-By: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
This commit is contained in:
thiolliere
2019-09-21 06:47:10 +02:00
committed by Gavin Wood
parent 68cda2fe79
commit c25d7386cf
15 changed files with 833 additions and 378 deletions
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substrate/srml/staking/src/mock.rs
+14
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@@ -18,6 +18,7 @@
use std::{collections::HashSet, cell::RefCell};
use sr_primitives::Perbill;
use sr_primitives::curve::PiecewiseLinear;
use sr_primitives::traits::{IdentityLookup, Convert, OpaqueKeys, OnInitialize, SaturatedConversion};
use sr_primitives::testing::{Header, UintAuthorityId};
use sr_staking_primitives::SessionIndex;
@@ -182,9 +183,20 @@ impl timestamp::Trait for Test {
type OnTimestampSet = ();
type MinimumPeriod = MinimumPeriod;
}
srml_staking_reward_curve::build! {
const I_NPOS: PiecewiseLinear<'static> = curve!(
min_inflation: 0_025_000,
max_inflation: 0_100_000,
ideal_stake: 0_500_000,
falloff: 0_050_000,
max_piece_count: 40,
test_precision: 0_005_000,
);
}
parameter_types! {
pub const SessionsPerEra: SessionIndex = 3;
pub const BondingDuration: EraIndex = 3;
pub const RewardCurve: &'static PiecewiseLinear<'static> = &I_NPOS;
}
impl Trait for Test {
type Currency = balances::Module<Self>;
@@ -197,6 +209,7 @@ impl Trait for Test {
type SessionsPerEra = SessionsPerEra;
type BondingDuration = BondingDuration;
type SessionInterface = Self;
type RewardCurve = RewardCurve;
}
pub struct ExtBuilder {
@@ -430,6 +443,7 @@ pub fn start_era(era_index: EraIndex) {
pub fn current_total_payout_for_duration(duration: u64) -> u64 {
let res = inflation::compute_total_payout(
<Test as Trait>::RewardCurve::get(),
<Module<Test>>::slot_stake() * 2,
Balances::total_issuance(),
duration,