diff --git a/go/utils/README.md b/go/utils/README.md new file mode 100644 index 000000000000..ae7a13688a6f --- /dev/null +++ b/go/utils/README.md @@ -0,0 +1,29 @@ +# utils + +This package is meant to hold utilities used by +[Optimistic Ethereum](https://github.com/ethereum-optimism/optimism) written in +Golang. + +## Packages + +### Fees + +Package fees includes helpers for dealing with fees on Optimistic Ethereum + +#### `EncodeTxGasLimit(data []byte, l1GasPrice, l2GasLimit, l2GasPrice *big.Int) *big.Int` + +Encodes `tx.gasLimit` based on the variables that are used to determine it. + +`data` - Calldata of the transaction being sent. This data should *not* include the full signed RLP transaction. + +`l1GasPrice` - gas price on L1 in wei + +`l2GasLimit` - amount of gas provided for execution in L2. Notably, accounts are charged for execution based on this gasLimit, even if the gasUsed ends up being less. + +`l2GasPrice` - gas price on L2 in wei + +#### `DecodeL2GasLimit(gasLimit *big.Int) *big.Int` + +Accepts the return value of `eth_estimateGas` and decodes the L2 gas limit that +is encoded in the return value. This is the gas limit that is passed to the user +contract within the OVM. diff --git a/go/utils/fees/rollup_fee.go b/go/utils/fees/rollup_fee.go new file mode 100644 index 000000000000..13feafbbdef7 --- /dev/null +++ b/go/utils/fees/rollup_fee.go @@ -0,0 +1,113 @@ +package fees + +import ( + "math/big" + + "github.com/ethereum/go-ethereum/common" + "github.com/ethereum/go-ethereum/params" +) + +// overhead represents the fixed cost of batch submission of a single +// transaction in gas. +const overhead uint64 = 4200 + 200*params.TxDataNonZeroGasEIP2028 + +// feeScalar is used to scale the calculations in EncodeL2GasLimit +// to prevent them from being too large +const feeScalar uint64 = 10_000_000 + +// TxGasPrice is a constant that determines the result of `eth_gasPrice` +// It is scaled upwards by 50% +// tx.gasPrice is hard coded to 1500 * wei and all transactions must set that +// gas price. +const TxGasPrice uint64 = feeScalar + (feeScalar / 2) + +// BigTxGasPrice is the L2GasPrice as type big.Int +var BigTxGasPrice = new(big.Int).SetUint64(TxGasPrice) +var bigFeeScalar = new(big.Int).SetUint64(feeScalar) + +const tenThousand = 10000 + +var BigTenThousand = new(big.Int).SetUint64(tenThousand) + +// EncodeTxGasLimit computes the `tx.gasLimit` based on the L1/L2 gas prices and +// the L2 gas limit. The L2 gas limit is encoded inside of the lower order bits +// of the number like so: [ | l2GasLimit ] +// [ tx.gaslimit ] +// The lower order bits must be large enough to fit the L2 gas limit, so 10**8 +// is chosen. If higher order bits collide with any bits from the L2 gas limit, +// the L2 gas limit will not be able to be decoded. +// An explicit design goal of this scheme was to make the L2 gas limit be human +// readable. The entire number is interpreted as the gas limit when computing +// the fee, so increasing the L2 Gas limit will increase the fee paid. +// The calculation is: +// l1GasLimit = zero_count(data) * 4 + non_zero_count(data) * 16 + overhead +// roundedL2GasLimit = ceilmod(l2GasLimit, 10_000) +// l1Fee = l1GasPrice * l1GasLimit +// l2Fee = l2GasPrice * roundedL2GasLimit +// sum = l1Fee + l2Fee +// scaled = sum / scalar +// rounded = ceilmod(scaled, tenThousand) +// roundedScaledL2GasLimit = roundedL2GasLimit / tenThousand +// result = rounded + roundedScaledL2GasLimit +// Note that for simplicity purposes, only the calldata is passed into this +// function when in reality the RLP encoded transaction should be. The +// additional cost is added to the overhead constant to prevent the need to RLP +// encode transactions during calls to `eth_estimateGas` +func EncodeTxGasLimit(data []byte, l1GasPrice, l2GasLimit, l2GasPrice *big.Int) *big.Int { + l1GasLimit := calculateL1GasLimit(data, overhead) + roundedL2GasLimit := Ceilmod(l2GasLimit, BigTenThousand) + l1Fee := new(big.Int).Mul(l1GasPrice, l1GasLimit) + l2Fee := new(big.Int).Mul(l2GasPrice, roundedL2GasLimit) + sum := new(big.Int).Add(l1Fee, l2Fee) + scaled := new(big.Int).Div(sum, bigFeeScalar) + rounded := Ceilmod(scaled, BigTenThousand) + roundedScaledL2GasLimit := new(big.Int).Div(roundedL2GasLimit, BigTenThousand) + result := new(big.Int).Add(rounded, roundedScaledL2GasLimit) + return result +} + +func Ceilmod(a, b *big.Int) *big.Int { + remainder := new(big.Int).Mod(a, b) + if remainder.Cmp(common.Big0) == 0 { + return a + } + sum := new(big.Int).Add(a, b) + rounded := new(big.Int).Sub(sum, remainder) + return rounded +} + +// DecodeL2GasLimit decodes the L2 gas limit from an encoded L2 gas limit +func DecodeL2GasLimit(gasLimit *big.Int) *big.Int { + scaled := new(big.Int).Mod(gasLimit, BigTenThousand) + return new(big.Int).Mul(scaled, BigTenThousand) +} + +func DecodeL2GasLimitU64(gasLimit uint64) uint64 { + scaled := gasLimit % tenThousand + return scaled * tenThousand +} + +// calculateL1GasLimit computes the L1 gasLimit based on the calldata and +// constant sized overhead. The overhead can be decreased as the cost of the +// batch submission goes down via contract optimizations. This will not overflow +// under standard network conditions. +func calculateL1GasLimit(data []byte, overhead uint64) *big.Int { + zeroes, ones := zeroesAndOnes(data) + zeroesCost := zeroes * params.TxDataZeroGas + onesCost := ones * params.TxDataNonZeroGasEIP2028 + gasLimit := zeroesCost + onesCost + overhead + return new(big.Int).SetUint64(gasLimit) +} + +func zeroesAndOnes(data []byte) (uint64, uint64) { + var zeroes uint64 + var ones uint64 + for _, byt := range data { + if byt == 0 { + zeroes++ + } else { + ones++ + } + } + return zeroes, ones +} diff --git a/go/utils/fees/rollup_fee_test.go b/go/utils/fees/rollup_fee_test.go new file mode 100644 index 000000000000..254d418ad8fa --- /dev/null +++ b/go/utils/fees/rollup_fee_test.go @@ -0,0 +1,104 @@ +package fees + +import ( + "math/big" + "testing" + + "github.com/ethereum/go-ethereum/params" +) + +var l1GasLimitTests = map[string]struct { + data []byte + overhead uint64 + expect *big.Int +}{ + "simple": {[]byte{}, 0, big.NewInt(0)}, + "simple-overhead": {[]byte{}, 10, big.NewInt(10)}, + "zeros": {[]byte{0x00, 0x00, 0x00, 0x00}, 10, big.NewInt(26)}, + "ones": {[]byte{0x01, 0x02, 0x03, 0x04}, 200, big.NewInt(16*4 + 200)}, +} + +func TestL1GasLimit(t *testing.T) { + for name, tt := range l1GasLimitTests { + t.Run(name, func(t *testing.T) { + got := calculateL1GasLimit(tt.data, tt.overhead) + if got.Cmp(tt.expect) != 0 { + t.Fatal("Calculated gas limit does not match") + } + }) + } +} + +var feeTests = map[string]struct { + dataLen int + l1GasPrice uint64 + l2GasLimit uint64 + l2GasPrice uint64 +}{ + "simple": { + dataLen: 10, + l1GasPrice: params.GWei, + l2GasLimit: 437118, + l2GasPrice: params.GWei, + }, + "zero-l2-gasprice": { + dataLen: 10, + l1GasPrice: params.GWei, + l2GasLimit: 196205, + l2GasPrice: 0, + }, + "one-l2-gasprice": { + dataLen: 10, + l1GasPrice: params.GWei, + l2GasLimit: 196205, + l2GasPrice: 1, + }, + "zero-l1-gasprice": { + dataLen: 10, + l1GasPrice: 0, + l2GasLimit: 196205, + l2GasPrice: params.GWei, + }, + "one-l1-gasprice": { + dataLen: 10, + l1GasPrice: 1, + l2GasLimit: 23255, + l2GasPrice: params.GWei, + }, + "zero-gasprices": { + dataLen: 10, + l1GasPrice: 0, + l2GasLimit: 23255, + l2GasPrice: 0, + }, + "max-gaslimit": { + dataLen: 10, + l1GasPrice: params.GWei, + l2GasLimit: 99_970_000, + l2GasPrice: params.GWei, + }, + "larger-divisor": { + dataLen: 10, + l1GasPrice: 0, + l2GasLimit: 10, + l2GasPrice: 0, + }, +} + +func TestCalculateRollupFee(t *testing.T) { + for name, tt := range feeTests { + t.Run(name, func(t *testing.T) { + data := make([]byte, tt.dataLen) + l1GasPrice := new(big.Int).SetUint64(tt.l1GasPrice) + l2GasLimit := new(big.Int).SetUint64(tt.l2GasLimit) + l2GasPrice := new(big.Int).SetUint64(tt.l2GasPrice) + + fee := EncodeTxGasLimit(data, l1GasPrice, l2GasLimit, l2GasPrice) + decodedGasLimit := DecodeL2GasLimit(fee) + roundedL2GasLimit := Ceilmod(l2GasLimit, BigTenThousand) + if roundedL2GasLimit.Cmp(decodedGasLimit) != 0 { + t.Errorf("rollup fee check failed: expected %d, got %d", l2GasLimit.Uint64(), decodedGasLimit) + } + }) + } +} diff --git a/go/utils/go.mod b/go/utils/go.mod new file mode 100644 index 000000000000..61d776bf5106 --- /dev/null +++ b/go/utils/go.mod @@ -0,0 +1,5 @@ +module github.com/ethereum-optimism/optimism/go/utils + +go 1.15 + +require github.com/ethereum/go-ethereum v1.9.10 diff --git a/go/utils/go.sum b/go/utils/go.sum new file mode 100644 index 000000000000..82868be88225 --- /dev/null +++ b/go/utils/go.sum @@ -0,0 +1,140 @@ +github.com/Azure/azure-pipeline-go v0.2.1/go.mod h1:UGSo8XybXnIGZ3epmeBw7Jdz+HiUVpqIlpz/HKHylF4= +github.com/Azure/azure-pipeline-go v0.2.2/go.mod h1:4rQ/NZncSvGqNkkOsNpOU1tgoNuIlp9AfUH5G1tvCHc= +github.com/Azure/azure-storage-blob-go v0.7.0/go.mod h1:f9YQKtsG1nMisotuTPpO0tjNuEjKRYAcJU8/ydDI++4= +github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI= +github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod 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