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#![cfg_attr(not(feature = "std"), no_std)]
use codec::{Decode, Encode};
use frame_support::{decl_error, decl_event, decl_module, decl_storage, ensure, storage, traits::Get};
use frame_system::{self as system, ensure_root};
use sp_runtime::{traits::SaturatedConversion, RuntimeDebug};
use sp_std::prelude::Vec;
mod mock;
mod tests;
type StorageKey = Vec<u8>;
type StorageValue = Vec<u8>;
#[derive(Encode, Decode, Clone, Eq, PartialEq, RuntimeDebug)]
pub struct GraduallyUpdate {
key: StorageKey,
target_value: StorageValue,
per_block: StorageValue,
}
pub trait Trait: frame_system::Trait {
type Event: From<Event<Self>> + Into<<Self as frame_system::Trait>::Event>;
type UpdateFrequency: Get<Self::BlockNumber>;
}
decl_storage! {
trait Store for Module<T: Trait> as GraduallyUpdate {
pub GraduallyUpdates get(fn gradually_updates): Vec<GraduallyUpdate>;
pub GraduallyUpdateBlockNumber get(fn gradually_update_block_number): T::BlockNumber;
}
}
decl_event!(
/// Event for gradually-update module.
pub enum Event<T> where
<T as frame_system::Trait>::BlockNumber,
{
/// Add gradually_update success (key, per_block, target_value)
GraduallyUpdate(StorageKey, StorageValue, StorageValue),
/// Cancel gradually_update success (key)
CancelGraduallyUpdate(StorageKey),
/// Update gradually_update success (blocknum, key, target_value)
GraduallyUpdateBlockNumber(BlockNumber, StorageKey, StorageValue),
}
);
decl_error! {
/// Error for gradually-update module.
pub enum Error for Module<T: Trait> {
InvalidPerBlockOrTargetValue,
InvalidTargetValue,
GraduallyUpdateHasExisted,
CancelGradullyUpdateNotExisted,
}
}
decl_module! {
pub struct Module<T: Trait> for enum Call where origin: T::Origin {
type Error = Error<T>;
fn deposit_event() = default;
const UpdateFrequency: T::BlockNumber = T::UpdateFrequency::get();
/// Add gradually_update to adjust numeric parameter. This is a root call.
pub fn gradually_update(origin, update: GraduallyUpdate) {
ensure_root(origin)?;
// Support max value is u128, ensure per_block and target_value <= 16 bytes.
ensure!(update.per_block.len() == update.target_value.len() && update.per_block.len() <= 16, Error::<T>::InvalidPerBlockOrTargetValue);
if storage::unhashed::exists(&update.key) {
let current_value = storage::unhashed::get::<StorageValue>(&update.key).unwrap();
ensure!(current_value.len() == update.target_value.len(), Error::<T>::InvalidTargetValue);
}
let mut gradually_updates = GraduallyUpdates::get();
ensure!(!gradually_updates.contains(&update), Error::<T>::GraduallyUpdateHasExisted);
gradually_updates.push(update.clone());
GraduallyUpdates::put(gradually_updates);
Self::deposit_event(RawEvent::GraduallyUpdate(update.key, update.per_block, update.target_value));
}
/// Cancel gradually_update to adjust numeric parameter. This is a root call.
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pub fn cancel_gradually_update(origin, key: StorageKey) {
ensure_root(origin)?;
let gradually_updates: Vec<GraduallyUpdate> = GraduallyUpdates::get()
.into_iter()
.filter(|item| item.key != key)
.collect();
ensure!(GraduallyUpdates::decode_len().unwrap_or_default() - gradually_updates.len() == 1, Error::<T>::CancelGradullyUpdateNotExisted);
GraduallyUpdates::put(gradually_updates);
Self::deposit_event(RawEvent::CancelGraduallyUpdate(key));
}
/// Update gradually_update to adjust numeric parameter.
fn on_finalize(now: T::BlockNumber) {
Self::_on_finalize(now);
}
}
}
impl<T: Trait> Module<T> {
fn _on_finalize(now: T::BlockNumber) {
if now < GraduallyUpdateBlockNumber::<T>::get() + T::UpdateFrequency::get() {
return;
}
let mut gradually_updates = GraduallyUpdates::get();
for (i, update) in gradually_updates.clone().iter().enumerate() {
let current_value = storage::unhashed::get::<StorageValue>(&update.key).unwrap_or_default();
let current_value_u128 = u128::from_le_bytes(Self::convert_vec_to_u8(¤t_value));
let frequency_u128: u128 = T::UpdateFrequency::get().saturated_into();
let step = u128::from_le_bytes(Self::convert_vec_to_u8(&update.per_block));
let step_u128 = step.checked_mul(frequency_u128).unwrap();
let target_u128 = u128::from_le_bytes(Self::convert_vec_to_u8(&update.target_value));
let new_value_u128: u128;
if current_value_u128 > target_u128 {
new_value_u128 = (current_value_u128.checked_sub(step_u128).unwrap()).max(target_u128);
} else {
new_value_u128 = (current_value_u128.checked_add(step_u128).unwrap()).min(target_u128);
}
// current_value equal target_value, remove gradually_update
if new_value_u128 == target_u128 {
gradually_updates.remove(i);
}
let mut value = new_value_u128.encode();
value.truncate(update.target_value.len());
storage::unhashed::put(&update.key, &value);
Self::deposit_event(RawEvent::GraduallyUpdateBlockNumber(now, update.key.clone(), value));
}
// gradually_update has finished. Remove it from GraduallyUpdates.
if gradually_updates.len() < GraduallyUpdates::decode_len().unwrap_or_default() {
GraduallyUpdates::put(gradually_updates);
}
GraduallyUpdateBlockNumber::<T>::put(now);
}
fn convert_vec_to_u8(input: &StorageValue) -> [u8; 16] {
let mut array: [u8; 16] = [0; 16];
for (i, v) in input.iter().enumerate() {
array[i] = v.clone();
}
array
}
}