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Median by Position (#533)

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* use median price instead of the highest sustained

* add test for lexicographically reversing a byte slice

* fix pr comments

* fix CI fail

* fix dex tests

* Use a fuzz-tested list of prices

* Working median algorithm based on position + lints

---------

Co-authored-by: akildemir <aeg_asd@hotmail.com>
This commit is contained in:
Luke Parker
2024-02-19 20:50:04 -05:00
committed by GitHub
parent 34b93b882c
commit 6f5d794f10
12 changed files with 334 additions and 92 deletions
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14
substrate/validator-sets/pallet/src/lib.rs
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@@ -216,23 +216,13 @@ pub mod pallet {
type SortedAllocations<T: Config> =
StorageMap<_, Identity, (NetworkId, [u8; 8], [u8; 16], Public), (), OptionQuery>;
impl<T: Config> Pallet<T> {
/// A function which takes an amount and generates a byte array with a lexicographic order from
/// high amount to low amount.
#[inline]
fn lexicographic_amount(amount: Amount) -> [u8; 8] {
let mut bytes = amount.0.to_be_bytes();
for byte in &mut bytes {
*byte = !*byte;
}
bytes
}
#[inline]
fn sorted_allocation_key(
network: NetworkId,
key: Public,
amount: Amount,
) -> (NetworkId, [u8; 8], [u8; 16], Public) {
let amount = Self::lexicographic_amount(amount);
let amount = reverse_lexicographic_order(amount.0.to_be_bytes());
let hash = sp_io::hashing::blake2_128(&(network, amount, key).encode());
(network, amount, hash, key)
}
@@ -769,7 +759,7 @@ pub mod pallet {
use dex_pallet::HigherPrecisionBalance;
// This is inclusive to an increase in accuracy
let sri_per_coin = Dex::<T>::oracle_value(balance.coin).unwrap_or(Amount(0));
let sri_per_coin = Dex::<T>::security_oracle_value(balance.coin).unwrap_or(Amount(0));
// See dex-pallet for the reasoning on these
let coin_decimals = balance.coin.decimals().max(5);