mirror of
https://github.com/luxfi/dex.git
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zeekay
0f6a1b3b86
- 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.
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// See the file LICENSE for licensing terms.
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package lx
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import (
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"errors"
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"math/big"
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)
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// uint128Max is 2^128 - 1.
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var uint128Max = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 128), big.NewInt(1))
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// ErrLiquidityUnderflow is returned when removing more liquidity than available.
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var ErrLiquidityUnderflow = errors.New("liquidity underflow")
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// ErrLiquidityOverflow is returned when the result exceeds uint128.
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var ErrLiquidityOverflow = errors.New("liquidity overflow")
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// AddDelta adds a signed liquidity delta to unsigned liquidity.
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// x is uint128 (current liquidity, non-negative).
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// y is int128 (delta, can be negative for removal).
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//
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// Matches Uniswap V4 LiquidityMath.addDelta:
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// - if y < 0: result = x - |y|, must not underflow (result < 0)
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// - if y >= 0: result = x + y, must not overflow uint128
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func AddDelta(x, y *big.Int) (*big.Int, error) {
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result := new(big.Int).Add(x, y)
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if y.Sign() < 0 {
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// Removal: result must be non-negative.
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if result.Sign() < 0 {
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return nil, ErrLiquidityUnderflow
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}
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} else {
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// Addition: result must fit in uint128.
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if result.Cmp(uint128Max) > 0 {
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return nil, ErrLiquidityOverflow
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}
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}
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return result, nil
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}
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