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Robert Habermeier
e2960c383e
* 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>
Randomness Module
The Randomness Collective Flip module provides a random
function that generates low-influence random values based on the block hashes from the previous
81 blocks. Low-influence randomness can be useful when defending against relatively weak
adversaries. Using this pallet as a randomness source is advisable primarily in low-security
situations like testing.
Public Functions
See the Module struct for details of publicly available functions.
Usage
Prerequisites
Import the Randomness Collective Flip module and derive your module's configuration trait from the system trait.
Example - Get random seed for the current block
use frame_support::{decl_module, dispatch, traits::Randomness};
pub trait Config: frame_system::Config {}
decl_module! {
pub struct Module<T: Config> for enum Call where origin: T::Origin {
#[weight = 0]
pub fn random_module_example(origin) -> dispatch::DispatchResult {
let _random_value = <pallet_randomness_collective_flip::Module<T>>::random(&b"my context"[..]);
Ok(())
}
}
}
License: Apache-2.0