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more clear randomness API for BABE (#8180)

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* more clear randomness API for BABE

* babe: move randomness utilities to its own file

* node: use babe::RandomnessFromOneEpochAgo in random_seed implementation

* frame-support: annotate randomness trait with block number

* pallet-randomness-collective-flip: fix for new randomness trait

* pallet-society: fix randomness usage

* pallet-lottery: fix randomness usage

* pallet-contracts: fix randomness usage

* pallet-babe: fix randomness usage

we need to track when the current and previous epoch started so that we
know the block number by each existing on-chain was known

* node: fix random_seed

* node-template: fix random_seed

* frame-support: extend docs

* babe: add test for epoch starting block number tracking

* babe: fix epoch randomness docs

* frame: add todos for dealing with randomness api changes

Co-authored-by: André Silva <andrerfosilva@gmail.com>
This commit is contained in:
Robert Habermeier
2021-03-10 10:31:49 -06:00
committed by GitHub
parent f3d4355a20
commit e2960c383e
18 changed files with 286 additions and 78 deletions
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substrate/frame/society/src/lib.rs
+7 -3
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@@ -283,7 +283,7 @@ pub trait Config<I=DefaultInstance>: system::Config {
type Currency: ReservableCurrency<Self::AccountId>;
/// Something that provides randomness in the runtime.
type Randomness: Randomness<Self::Hash>;
type Randomness: Randomness<Self::Hash, Self::BlockNumber>;
/// The minimum amount of a deposit required for a bid to be made.
type CandidateDeposit: Get<BalanceOf<Self, I>>;
@@ -1309,7 +1309,9 @@ impl<T: Config<I>, I: Instance> Module<T, I> {
let mut pot = <Pot<T, I>>::get();
// we'll need a random seed here.
let seed = T::Randomness::random(phrase);
// TODO: deal with randomness freshness
// https://github.com/paritytech/substrate/issues/8312
let (seed, _) = T::Randomness::random(phrase);
// seed needs to be guaranteed to be 32 bytes.
let seed = <[u8; 32]>::decode(&mut TrailingZeroInput::new(seed.as_ref()))
.expect("input is padded with zeroes; qed");
@@ -1565,7 +1567,9 @@ impl<T: Config<I>, I: Instance> Module<T, I> {
// Start a new defender rotation
let phrase = b"society_challenge";
// we'll need a random seed here.
let seed = T::Randomness::random(phrase);
// TODO: deal with randomness freshness
// https://github.com/paritytech/substrate/issues/8312
let (seed, _) = T::Randomness::random(phrase);
// seed needs to be guaranteed to be 32 bytes.
let seed = <[u8; 32]>::decode(&mut TrailingZeroInput::new(seed.as_ref()))
.expect("input is padded with zeroes; qed");