304 lines
11 KiB
Go
304 lines
11 KiB
Go
package simulation
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import (
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"encoding/json"
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"fmt"
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"math/big"
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"math/rand"
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"time"
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"cosmossdk.io/math"
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"github.com/cosmos/cosmos-sdk/baseapp"
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"github.com/cosmos/cosmos-sdk/client"
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"github.com/cosmos/cosmos-sdk/codec"
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codectypes "github.com/cosmos/cosmos-sdk/codec/types"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdktx "github.com/cosmos/cosmos-sdk/types/tx"
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"github.com/cosmos/cosmos-sdk/types/module"
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simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
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"github.com/cosmos/cosmos-sdk/x/auth/signing"
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"github.com/cosmos/cosmos-sdk/x/auth/tx"
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"github.com/cosmos/cosmos-sdk/x/simulation"
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"github.com/ethereum/go-ethereum/common/hexutil"
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ethtypes "github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
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"github.com/tharsis/ethermint/encoding"
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"github.com/tharsis/ethermint/server/config"
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"github.com/tharsis/ethermint/tests"
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"github.com/tharsis/ethermint/x/evm/keeper"
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"github.com/tharsis/ethermint/x/evm/types"
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)
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const (
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/* #nosec */
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OpWeightMsgEthSimpleTransfer = "op_weight_msg_eth_simple_transfer"
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/* #nosec */
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OpWeightMsgEthCreateContract = "op_weight_msg_eth_create_contract"
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/* #nosec */
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OpWeightMsgEthCallContract = "op_weight_msg_eth_call_contract"
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)
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const (
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WeightMsgEthSimpleTransfer = 50
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WeightMsgEthCreateContract = 50
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)
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var ErrNoEnoughBalance = fmt.Errorf("no enough balance")
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var maxWaitSeconds = 10
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type simulateContext struct {
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context sdk.Context
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bapp *baseapp.BaseApp
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rand *rand.Rand
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keeper *keeper.Keeper
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}
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// WeightedOperations generate Two kinds of operations: SimulateEthSimpleTransfer, SimulateEthCreateContract.
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// Contract call operations work as the future operations of SimulateEthCreateContract.
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func WeightedOperations(
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appParams simtypes.AppParams, cdc codec.JSONCodec, ak types.AccountKeeper, k *keeper.Keeper,
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) simulation.WeightedOperations {
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var (
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weightMsgEthSimpleTransfer int
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weightMsgEthCreateContract int
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)
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appParams.GetOrGenerate(cdc, OpWeightMsgEthSimpleTransfer, &weightMsgEthSimpleTransfer, nil,
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func(_ *rand.Rand) {
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weightMsgEthSimpleTransfer = WeightMsgEthSimpleTransfer
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},
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)
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appParams.GetOrGenerate(cdc, OpWeightMsgEthCreateContract, &weightMsgEthCreateContract, nil,
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func(_ *rand.Rand) {
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weightMsgEthCreateContract = WeightMsgEthCreateContract
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},
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)
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return simulation.WeightedOperations{
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simulation.NewWeightedOperation(
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weightMsgEthSimpleTransfer,
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SimulateEthSimpleTransfer(ak, k),
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),
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simulation.NewWeightedOperation(
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weightMsgEthCreateContract,
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SimulateEthCreateContract(ak, k),
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),
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}
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}
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// SimulateEthSimpleTransfer simulate simple eth account transferring gas token.
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// It randomly choose sender, recipient and transferable amount.
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// Other tx details like nonce, gasprice, gaslimit are calculated to get valid value.
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func SimulateEthSimpleTransfer(ak types.AccountKeeper, k *keeper.Keeper) simtypes.Operation {
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return func(
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r *rand.Rand, bapp *baseapp.BaseApp, ctx sdk.Context, accs []simtypes.Account, chainID string,
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) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
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simAccount, _ := simtypes.RandomAcc(r, accs)
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var recipient simtypes.Account
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if r.Intn(2) == 1 {
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recipient, _ = simtypes.RandomAcc(r, accs)
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} else {
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recipient = simtypes.RandomAccounts(r, 1)[0]
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}
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from := common.BytesToAddress(simAccount.Address)
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to := common.BytesToAddress(recipient.Address)
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simulateContext := &simulateContext{ctx, bapp, r, k}
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return SimulateEthTx(simulateContext, &from, &to, nil, (*hexutil.Bytes)(&[]byte{}), simAccount.PrivKey, nil)
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}
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}
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// SimulateEthCreateContract simulate create an ERC20 contract.
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// It makes operationSimulateEthCallContract the future operations of SimulateEthCreateContract to ensure valid contract call.
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func SimulateEthCreateContract(ak types.AccountKeeper, k *keeper.Keeper) simtypes.Operation {
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return func(
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r *rand.Rand, bapp *baseapp.BaseApp, ctx sdk.Context, accs []simtypes.Account, chainID string,
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) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
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simAccount, _ := simtypes.RandomAcc(r, accs)
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from := common.BytesToAddress(simAccount.Address)
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nonce := k.GetNonce(ctx, from)
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ctorArgs, err := types.ERC20Contract.ABI.Pack("", from, math.NewIntWithDecimal(1000, 18).BigInt())
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if err != nil {
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return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgEthereumTx, "can not pack owner and supply"), nil, err
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}
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data := types.ERC20Contract.Bin
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data = append(data, ctorArgs...)
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simulateContext := &simulateContext{ctx, bapp, r, k}
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fops := make([]simtypes.FutureOperation, 1)
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whenCall := ctx.BlockHeader().Time.Add(time.Duration(r.Intn(maxWaitSeconds)+1) * time.Second)
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contractAddr := crypto.CreateAddress(from, nonce)
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var tokenReceipient simtypes.Account
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if r.Intn(2) == 1 {
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tokenReceipient, _ = simtypes.RandomAcc(r, accs)
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} else {
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tokenReceipient = simtypes.RandomAccounts(r, 1)[0]
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}
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receipientAddr := common.BytesToAddress(tokenReceipient.Address)
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fops[0] = simtypes.FutureOperation{
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BlockTime: whenCall,
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Op: operationSimulateEthCallContract(k, &contractAddr, &receipientAddr, nil),
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}
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return SimulateEthTx(simulateContext, &from, nil, nil, (*hexutil.Bytes)(&data), simAccount.PrivKey, fops)
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}
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}
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// operationSimulateEthCallContract simulate calling an contract.
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// It is always calling an ERC20 contract.
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func operationSimulateEthCallContract(k *keeper.Keeper, contractAddr, to *common.Address, amount *big.Int) simtypes.Operation {
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return func(
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r *rand.Rand, bapp *baseapp.BaseApp, ctx sdk.Context, accs []simtypes.Account, chainID string,
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) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
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simAccount, _ := simtypes.RandomAcc(r, accs)
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from := common.BytesToAddress(simAccount.Address)
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ctorArgs, err := types.ERC20Contract.ABI.Pack("transfer", to, amount)
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if err != nil {
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return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgEthereumTx, "can not pack method and args"), nil, err
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}
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data := types.ERC20Contract.Bin
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data = append(data, ctorArgs...)
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simulateContext := &simulateContext{ctx, bapp, r, k}
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return SimulateEthTx(simulateContext, &from, contractAddr, nil, (*hexutil.Bytes)(&data), simAccount.PrivKey, nil)
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}
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}
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// SimulateEthTx creates valid ethereum tx and pack it as cosmos tx, and deliver it.
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func SimulateEthTx(
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ctx *simulateContext, from, to *common.Address, amount *big.Int, data *hexutil.Bytes, prv cryptotypes.PrivKey, fops []simtypes.FutureOperation,
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) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
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ethTx, err := CreateRandomValidEthTx(ctx, from, nil, nil, data)
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if err == ErrNoEnoughBalance {
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return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgEthereumTx, "no enough balance"), nil, nil
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}
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if err != nil {
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return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgEthereumTx, "can not create valid eth tx"), nil, err
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}
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txConfig := encoding.MakeConfig(module.NewBasicManager()).TxConfig
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txBuilder := txConfig.NewTxBuilder()
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signedTx, err := GetSignedTx(ctx, txBuilder, ethTx, prv)
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if err != nil {
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return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgEthereumTx, "can not sign ethereum tx"), nil, err
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}
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_, _, err = ctx.bapp.SimDeliver(txConfig.TxEncoder(), signedTx)
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if err != nil {
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return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgEthereumTx, "failed to deliver tx"), nil, err
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}
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return simtypes.OperationMsg{}, fops, nil
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}
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// CreateRandomValidEthTx create the ethereum tx with valid random values
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func CreateRandomValidEthTx(ctx *simulateContext, from, to *common.Address, amount *big.Int, data *hexutil.Bytes) (ethTx *types.MsgEthereumTx, err error) {
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estimateGas, err := EstimateGas(ctx, from, to, data)
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if err != nil {
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return nil, err
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}
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gasLimit := estimateGas + uint64(ctx.rand.Intn(int(sdktx.MaxGasWanted-estimateGas)))
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ethChainID := ctx.keeper.ChainID()
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chainConfig := ctx.keeper.GetParams(ctx.context).ChainConfig.EthereumConfig(ethChainID)
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gasPrice := ctx.keeper.BaseFee(ctx.context, chainConfig)
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gasFeeCap := new(big.Int).Add(gasPrice, big.NewInt(int64(ctx.rand.Int())))
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gasTipCap := big.NewInt(int64(ctx.rand.Int()))
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nonce := ctx.keeper.GetNonce(ctx.context, *from)
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if amount == nil {
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amount, err = RandomTransferableAmount(ctx, *from, gasLimit, gasFeeCap)
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if err != nil {
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return nil, err
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}
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}
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ethTx = types.NewTx(ethChainID, nonce, to, amount, gasLimit, gasPrice, gasFeeCap, gasTipCap, *data, nil)
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ethTx.From = from.String()
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return ethTx, nil
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}
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// GetSignedTx sign the ethereum tx and packs it as a signing.Tx .
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func GetSignedTx(ctx *simulateContext, txBuilder client.TxBuilder, msg *types.MsgEthereumTx, prv cryptotypes.PrivKey) (signedTx signing.Tx, err error) {
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builder, ok := txBuilder.(tx.ExtensionOptionsTxBuilder)
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if !ok {
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return nil, fmt.Errorf("can not initiate ExtensionOptionsTxBuilder")
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}
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option, err := codectypes.NewAnyWithValue(&types.ExtensionOptionsEthereumTx{})
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if err != nil {
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return nil, err
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}
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builder.SetExtensionOptions(option)
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if err := msg.Sign(ethtypes.LatestSignerForChainID(ctx.keeper.ChainID()), tests.NewSigner(prv)); err != nil {
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return nil, err
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}
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if err = builder.SetMsgs(msg); err != nil {
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return nil, err
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}
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txData, err := types.UnpackTxData(msg.Data)
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if err != nil {
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return nil, err
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}
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fees := sdk.NewCoins(sdk.NewCoin(ctx.keeper.GetParams(ctx.context).EvmDenom, sdk.NewIntFromBigInt(txData.Fee())))
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builder.SetFeeAmount(fees)
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builder.SetGasLimit(msg.GetGas())
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signedTx = builder.GetTx()
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return signedTx, nil
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}
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// RandomTransferableAmount generates a random valid transferable amount.
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// Transferable amount is between the range [0, spendable), spendable = balance - gasFeeCap * GasLimit.
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func RandomTransferableAmount(ctx *simulateContext, address common.Address, gasLimit uint64, gasFeeCap *big.Int) (amount *big.Int, err error) {
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balance := ctx.keeper.GetBalance(ctx.context, address)
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feeLimit := new(big.Int).Mul(gasFeeCap, big.NewInt(int64(gasLimit)))
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if (feeLimit.Cmp(balance)) > 0 {
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return nil, ErrNoEnoughBalance
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}
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spendable := new(big.Int).Sub(balance, feeLimit)
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if spendable.Cmp(big.NewInt(0)) == 0 {
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amount = new(big.Int).Set(spendable)
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return amount, nil
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}
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simAmount, err := simtypes.RandPositiveInt(ctx.rand, sdk.NewIntFromBigInt(spendable))
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if err != nil {
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return nil, err
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}
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amount = simAmount.BigInt()
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return amount, nil
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}
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// EstimateGas estimates the gas used by quering the keeper.
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func EstimateGas(ctx *simulateContext, from, to *common.Address, data *hexutil.Bytes) (gas uint64, err error) {
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args, err := json.Marshal(&types.TransactionArgs{To: to, From: from, Data: data})
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if err != nil {
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return 0, err
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}
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res, err := ctx.keeper.EstimateGas(sdk.WrapSDKContext(ctx.context), &types.EthCallRequest{
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Args: args,
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GasCap: config.DefaultGasCap,
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})
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if err != nil {
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return 0, err
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}
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return res.Gas, nil
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}
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