mirror of
https://github.com/luxfi/dex.git
synced 2026-09-24 00:26:31 +00:00
zeekay
7a0fcb06ee
- pkg/lx/signed_order{,_cpu,_gpu,_nogpu}.go: SignedOrder with SigningHash
and BatchVerifyOrders cgo bridge
- pkg/lx/signed_order_metal_anchor_darwin.{c,go}: keep linker from
dropping libsecp256k1_metal.a from the static archive
- pkg/lx/amm{,_gpu,_nogpu}.go: ReservePair, ConstantProductOut,
BatchEvalConstantProduct via Metal kernel
- pkg/lx/{signed_order,amm_gpu}_test.go: tests
- pkg/lx/orderbook.go, test/benchmark/orderbook_bench_test.go: misc
End-to-end through cgo (Apple M1 Max):
BatchVerifyOrders CPU: 27.91 verifies/sec
BatchVerifyOrders Metal: 87,229 verifies/sec
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Copyright (C) 2025-2026, 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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"encoding/binary"
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"errors"
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"math"
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"github.com/luxfi/crypto"
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"github.com/luxfi/geth/common"
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)
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// SignedOrder is an Order plus an attached secp256k1 signature and the
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// caller-claimed sender address. The signature covers SigningHash(); the
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// expected verification is "ecrecover(SigningHash, Sig) == Sender".
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//
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// Sig is the standard Ethereum (r||s||v) layout where v ∈ {0, 1}.
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type SignedOrder struct {
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Order
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Sig [65]byte
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Sender common.Address
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}
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// SigningHash is a deterministic 32-byte digest of the order fields that the
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// signature covers. The fields are packed in a fixed order with fixed widths
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// so the digest is identical on every host. We deliberately keep the encoding
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// minimal — IDs, symbol, side/type, price (PriceInt), size (uint64 ticks),
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// sender, and the user-provided ClientID — anything beyond that is not part
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// of the auth surface for the GPU-batched ingestion path.
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//
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// The encoding is:
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//
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// uint64 ID
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// uint16 len(Symbol) || Symbol
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// uint8 Side
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// uint8 Type
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// int64 PriceInt(Price) // overflow → returns error
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// uint64 SizeTicks(Size) // size * PriceMultiplier (overflow → err)
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// uint16 len(ClientID) || ClientID
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// 20 Sender
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func (o *SignedOrder) SigningHash() ([32]byte, error) {
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priceInt, err := safePriceToInt(o.Price)
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if err != nil {
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return [32]byte{}, err
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}
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if o.Size < 0 || o.Size > MaxSafePrice {
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return [32]byte{}, errors.New("size out of range for SigningHash")
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}
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sizeTicks := uint64(math.Round(o.Size * PriceMultiplier))
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buf := make([]byte, 0, 8+2+len(o.Symbol)+1+1+8+8+2+len(o.ClientID)+20)
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var u8 [8]byte
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binary.BigEndian.PutUint64(u8[:], o.ID)
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buf = append(buf, u8[:]...)
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binary.BigEndian.PutUint16(u8[:2], uint16(len(o.Symbol)))
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buf = append(buf, u8[:2]...)
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buf = append(buf, o.Symbol...)
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buf = append(buf, byte(o.Side))
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buf = append(buf, byte(o.Type))
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binary.BigEndian.PutUint64(u8[:], uint64(priceInt))
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buf = append(buf, u8[:]...)
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binary.BigEndian.PutUint64(u8[:], sizeTicks)
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buf = append(buf, u8[:]...)
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binary.BigEndian.PutUint16(u8[:2], uint16(len(o.ClientID)))
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buf = append(buf, u8[:2]...)
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buf = append(buf, o.ClientID...)
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buf = append(buf, o.Sender[:]...)
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var out [32]byte
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copy(out[:], crypto.Keccak256(buf))
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return out, nil
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}
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