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Enable fixed point u128 (#6214)

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* Add fixed u128.

* remove move

* Change sat_from_integer impl.

* checked_pow is always positive

* Revert.

* rename fixed file

* Rename to FixedI

* rename fixed file

* Add newline.

* Use Multiplier in impls.

* Renames negate() to saturating_negate().

* Uncomment test.

* Add Signed to macro.

* Add some tests for Saturating trait.
This commit is contained in:
Marcio Diaz
2020-06-06 13:04:39 +02:00
committed by GitHub
parent 0761a8e0c3
commit 7c051caa42
11 changed files with 424 additions and 342 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/bin/node/runtime/src/impls.rs
+35 -34
View File
@@ -19,8 +19,9 @@
use node_primitives::Balance;
use sp_runtime::traits::{Convert, Saturating};
use sp_runtime::{FixedPointNumber, Fixed128, Perquintill};
use sp_runtime::{FixedPointNumber, Perquintill};
use frame_support::traits::{OnUnbalanced, Currency, Get};
use pallet_transaction_payment::Multiplier;
use crate::{Balances, System, Authorship, MaximumBlockWeight, NegativeImbalance};
pub struct Author;
@@ -56,8 +57,8 @@ impl Convert<u128, Balance> for CurrencyToVoteHandler {
/// https://research.web3.foundation/en/latest/polkadot/Token%20Economics/#relay-chain-transaction-fees
pub struct TargetedFeeAdjustment<T>(sp_std::marker::PhantomData<T>);
impl<T: Get<Perquintill>> Convert<Fixed128, Fixed128> for TargetedFeeAdjustment<T> {
fn convert(multiplier: Fixed128) -> Fixed128 {
impl<T: Get<Perquintill>> Convert<Multiplier, Multiplier> for TargetedFeeAdjustment<T> {
fn convert(multiplier: Multiplier) -> Multiplier {
let max_weight = MaximumBlockWeight::get();
let block_weight = System::block_weight().total().min(max_weight);
let target_weight = (T::get() * max_weight) as u128;
@@ -67,13 +68,13 @@ impl<T: Get<Perquintill>> Convert<Fixed128, Fixed128> for TargetedFeeAdjustment<
let positive = block_weight >= target_weight;
let diff_abs = block_weight.max(target_weight) - block_weight.min(target_weight);
// safe, diff_abs cannot exceed u64.
let diff = Fixed128::saturating_from_rational(diff_abs, max_weight.max(1));
let diff = Multiplier::saturating_from_rational(diff_abs, max_weight.max(1));
let diff_squared = diff.saturating_mul(diff);
// 0.00004 = 4/100_000 = 40_000/10^9
let v = Fixed128::saturating_from_rational(4, 100_000);
let v = Multiplier::saturating_from_rational(4, 100_000);
// 0.00004^2 = 16/10^10 Taking the future /2 into account... 8/10^10
let v_squared_2 = Fixed128::saturating_from_rational(8, 10_000_000_000u64);
let v_squared_2 = Multiplier::saturating_from_rational(8, 10_000_000_000u64);
let first_term = v.saturating_mul(diff);
let second_term = v_squared_2.saturating_mul(diff_squared);
@@ -92,7 +93,7 @@ impl<T: Get<Perquintill>> Convert<Fixed128, Fixed128> for TargetedFeeAdjustment<
// multiplier. While at -1, it means that the network is so un-congested that all
// transactions have no weight fee. We stop here and only increase if the network
// became more busy.
.max(Fixed128::saturating_from_integer(-1))
.max(Multiplier::saturating_from_integer(-1))
}
}
}
@@ -114,7 +115,7 @@ mod tests {
}
// poc reference implementation.
fn fee_multiplier_update(block_weight: Weight, previous: Fixed128) -> Fixed128 {
fn fee_multiplier_update(block_weight: Weight, previous: Multiplier) -> Multiplier {
// maximum tx weight
let m = max() as f64;
// block weight always truncated to max weight
@@ -127,7 +128,7 @@ mod tests {
let s = block_weight;
let fm = v * (s/m - ss/m) + v.powi(2) * (s/m - ss/m).powi(2) / 2.0;
let addition_fm = Fixed128::from_inner((fm * Fixed128::accuracy() as f64).round() as i128);
let addition_fm = Multiplier::from_inner((fm * Multiplier::accuracy() as f64).round() as i128);
previous.saturating_add(addition_fm)
}
@@ -142,7 +143,7 @@ mod tests {
#[test]
fn fee_multiplier_update_poc_works() {
let fm = Fixed128::saturating_from_rational(0, 1);
let fm = Multiplier::saturating_from_rational(0, 1);
let test_set = vec![
(0, fm.clone()),
(100, fm.clone()),
@@ -156,7 +157,7 @@ mod tests {
fee_multiplier_update(w, fm),
TargetedFeeAdjustment::<TargetBlockFullness>::convert(fm),
// Error is only 1 in 10^18
Fixed128::from_inner(1),
Multiplier::from_inner(1),
);
})
})
@@ -167,12 +168,12 @@ mod tests {
// just a few txs per_block.
let block_weight = 0;
run_with_system_weight(block_weight, || {
let mut fm = Fixed128::default();
let mut fm = Multiplier::default();
let mut iterations: u64 = 0;
loop {
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(fm);
fm = next;
if fm == Fixed128::saturating_from_integer(-1) { break; }
if fm == Multiplier::saturating_from_integer(-1) { break; }
iterations += 1;
}
println!("iteration {}, new fm = {:?}. Weight fee is now zero", iterations, fm);
@@ -200,7 +201,7 @@ mod tests {
run_with_system_weight(block_weight, || {
// initial value configured on module
let mut fm = Fixed128::default();
let mut fm = Multiplier::default();
assert_eq!(fm, TransactionPayment::next_fee_multiplier());
let mut iterations: u64 = 0;
@@ -233,49 +234,49 @@ mod tests {
// and light blocks will have a weight multiplier less than 0.
run_with_system_weight(target() / 4, || {
// `fee_multiplier_update` is enough as it is the absolute truth value.
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Fixed128::default());
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Multiplier::default());
assert_eq!(
next,
fee_multiplier_update(target() / 4 ,Fixed128::default())
fee_multiplier_update(target() / 4 ,Multiplier::default())
);
// Light block. Fee is reduced a little.
assert!(next < Fixed128::zero())
assert!(next < Multiplier::zero())
});
run_with_system_weight(target() / 2, || {
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Fixed128::default());
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Multiplier::default());
assert_eq!(
next,
fee_multiplier_update(target() / 2 ,Fixed128::default())
fee_multiplier_update(target() / 2 ,Multiplier::default())
);
// Light block. Fee is reduced a little.
assert!(next < Fixed128::zero())
assert!(next < Multiplier::zero())
});
run_with_system_weight(target(), || {
// ideal. Original fee. No changes.
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Fixed128::default());
assert_eq!(next, Fixed128::zero())
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Multiplier::default());
assert_eq!(next, Multiplier::zero())
});
run_with_system_weight(target() * 2, || {
// More than ideal. Fee is increased.
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Fixed128::default());
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Multiplier::default());
assert_eq!(
next,
fee_multiplier_update(target() * 2 ,Fixed128::default())
fee_multiplier_update(target() * 2 ,Multiplier::default())
);
// Heavy block. Fee is increased a little.
assert!(next > Fixed128::zero())
assert!(next > Multiplier::zero())
});
}
#[test]
fn stateful_weight_mul_grow_to_infinity() {
run_with_system_weight(target() * 2, || {
let mut original = Fixed128::default();
let mut next = Fixed128::default();
let mut original = Multiplier::default();
let mut next = Multiplier::default();
(0..1_000).for_each(|_| {
next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(original);
@@ -293,7 +294,7 @@ mod tests {
#[test]
fn stateful_weight_mil_collapse_to_minus_one() {
run_with_system_weight(0, || {
let mut original = Fixed128::default(); // 0
let mut original = Multiplier::default(); // 0
let mut next;
// decreases
@@ -315,8 +316,8 @@ mod tests {
// ... stops going down at -1
assert_eq!(
TargetedFeeAdjustment::<TargetBlockFullness>::convert(Fixed128::saturating_from_integer(-1)),
Fixed128::saturating_from_integer(-1)
TargetedFeeAdjustment::<TargetBlockFullness>::convert(Multiplier::saturating_from_integer(-1)),
Multiplier::saturating_from_integer(-1)
);
})
}
@@ -325,7 +326,7 @@ mod tests {
fn weight_to_fee_should_not_overflow_on_large_weights() {
let kb = 1024 as Weight;
let mb = kb * kb;
let max_fm = Fixed128::saturating_from_integer(i128::max_value());
let max_fm = Multiplier::saturating_from_integer(i128::max_value());
// check that for all values it can compute, correctly.
vec![
@@ -346,9 +347,9 @@ mod tests {
Weight::max_value(),
].into_iter().for_each(|i| {
run_with_system_weight(i, || {
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Fixed128::default());
let truth = fee_multiplier_update(i, Fixed128::default());
assert_eq_error_rate!(truth, next, Fixed128::from_inner(50_000_000));
let next = TargetedFeeAdjustment::<TargetBlockFullness>::convert(Multiplier::default());
let truth = fee_multiplier_update(i, Multiplier::default());
assert_eq_error_rate!(truth, next, Multiplier::from_inner(50_000_000));
});
});