mirror of
https://github.com/luxfi/dex.git
synced 2026-10-30 14:45:46 +00:00
zeekay
222b212697
- CrossChainRouter with BFS path discovery across chain graph - 4 bridge venues: Warp (AWM), Teleport, CCTP, LuxBridge - Triangular + cross-chain arbitrage scanner - HTTP handlers: cross-chain quote, bridges list, arb scan - Gateway: venue router, order management, LP, multihop, Uniswap compat - V4 LXRouter calldata builder with encode/decode - All test tokens use generic LUSD (no white-label refs) - 72 trading tests + gateway tests passing
42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
// Copyright (C) 2025, Lux Industries Inc. All rights reserved.
|
|
// See the file LICENSE for licensing terms.
|
|
|
|
package lx
|
|
|
|
import (
|
|
"errors"
|
|
"math/big"
|
|
)
|
|
|
|
// uint128Max is 2^128 - 1.
|
|
var uint128Max = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 128), big.NewInt(1))
|
|
|
|
// ErrLiquidityUnderflow is returned when removing more liquidity than available.
|
|
var ErrLiquidityUnderflow = errors.New("liquidity underflow")
|
|
|
|
// ErrLiquidityOverflow is returned when the result exceeds uint128.
|
|
var ErrLiquidityOverflow = errors.New("liquidity overflow")
|
|
|
|
// AddDelta adds a signed liquidity delta to unsigned liquidity.
|
|
// x is uint128 (current liquidity, non-negative).
|
|
// y is int128 (delta, can be negative for removal).
|
|
//
|
|
// Matches Uniswap V4 LiquidityMath.addDelta:
|
|
// - if y < 0: result = x - |y|, must not underflow (result < 0)
|
|
// - if y >= 0: result = x + y, must not overflow uint128
|
|
func AddDelta(x, y *big.Int) (*big.Int, error) {
|
|
result := new(big.Int).Add(x, y)
|
|
if y.Sign() < 0 {
|
|
// Removal: result must be non-negative.
|
|
if result.Sign() < 0 {
|
|
return nil, ErrLiquidityUnderflow
|
|
}
|
|
} else {
|
|
// Addition: result must fit in uint128.
|
|
if result.Cmp(uint128Max) > 0 {
|
|
return nil, ErrLiquidityOverflow
|
|
}
|
|
}
|
|
return result, nil
|
|
}
|