pallet-randomness-collective-flip

Crates.iopallet-randomness-collective-flip
lib.rspallet-randomness-collective-flip
version15.0.0
sourcesrc
created_at2020-02-27 09:38:06.833098
updated_at2023-02-05 12:50:49.416597
descriptionFRAME randomness collective flip pallet
homepagehttps://substrate.io
repositoryhttps://github.com/paritytech/substrate/
max_upload_size
id213032
size13,996
Parity Crate Owner (parity-crate-owner)

documentation

README

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::traits::Randomness;

#[frame_support::pallet]
pub mod pallet {
    use super::*;
    use frame_support::pallet_prelude::*;
    use frame_system::pallet_prelude::*;

    #[pallet::pallet]
    pub struct Pallet<T>(_);

    #[pallet::config]
    pub trait Config: frame_system::Config + pallet_randomness_collective_flip::Config {}

    #[pallet::call]
    impl<T: Config> Pallet<T> {
        #[pallet::weight(0)]
        pub fn random_module_example(origin: OriginFor<T>) -> DispatchResult {
            let _random_value = <pallet_randomness_collective_flip::Pallet<T>>::random(&b"my context"[..]);
            Ok(())
        }
    }
}

License: Apache-2.0

Commit count: 8235

cargo fmt