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Shaun Wang
2e5522444a
* Use 'Pallet' struct in construct_runtime. * Fix genesis and metadata macro. * Fix 'Pallet' type alias. * Replace 'Module' with 'Pallet' for all construct_runtime use cases. * Replace more deprecated 'Module' struct. * Bring back AllModules and AllPalletsWithSystem type, but deprecate them. * Replace deprecated 'Module' struct from merge master. * Minor fix. * Fix UI tests. * Revert UI override in derive_no_bound. * Fix more deprecated 'Module' use from master branch. * Fix more deprecated 'Module' use from master branch.
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