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https://github.com/pezkuwichain/pezkuwi-subxt.git
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Bastian Köcher
ce97b6e5c4
* Make it possible to calculate the storage as often as you want So, until now each Substrate based blockchain has calculated the storage root once, at the end of the block. Now there is Frontier that wants to calculate some intermediate storage root. However this failed on block import. The problem with that was the extrinsics root. When building the block we stored `Default::default()` as extrinsics root, because yeah, we don't know the extrinsics root before finishing the block. At the end this extrinsics root was then calculated. But on block import we passed the already known extrinsics root. This was no problem, as we removed this value at the end of the block. However when you all the storage root in between, that changes the storage root between block building and block import. This pr changes this behavior. It removes the `ExtrinsicsRoot` storage entry and also doesn't pass it anymore to `System::initialize`. By doing it, we remove the difference in the storage and fix the storage root mismatch. * Fix bug with incorrectly calculating the extrinscs root * Review feedback
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