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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/lottery/src/lib.rs
+4 -2
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@@ -85,7 +85,7 @@ pub trait Config: frame_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 overarching event type.
type Event: From<Event<Self>> + Into<<Self as frame_system::Config>::Event>;
@@ -443,8 +443,10 @@ impl<T: Config> Module<T> {
// Note that there is potential bias introduced by using modulus operator.
// You should call this function with different seed values until the random
// number lies within `u32::MAX - u32::MAX % n`.
// TODO: deal with randomness freshness
// https://github.com/paritytech/substrate/issues/8311
fn generate_random_number(seed: u32) -> u32 {
let random_seed = T::Randomness::random(&(T::ModuleId::get(), seed).encode());
let (random_seed, _) = T::Randomness::random(&(T::ModuleId::get(), seed).encode());
let random_number = <u32>::decode(&mut random_seed.as_ref())
.expect("secure hashes should always be bigger than u32; qed");
random_number