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eth_estimateGas (#128)

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* Draft eth_estimateGas
* implemented eth_estimateGas
* refactored doCall to be used for both eth_call and eth_estiamteGas

* updated to reflect requested changes

* moved GenerateFromArgs func

* removed todo

* revert comment

* fixes dereference issue

* gofmted
This commit is contained in:
Dustin Brickwood
2019-10-30 13:30:24 -05:00
committed by GitHub
parent 741dfeb461
commit 69e0873dd9
6 changed files with 115 additions and 103 deletions
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rpc/eth_api.go
+89 -17
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@@ -9,8 +9,9 @@ import (
emintcrypto "github.com/cosmos/ethermint/crypto"
emintkeys "github.com/cosmos/ethermint/keys"
"github.com/cosmos/ethermint/rpc/args"
params "github.com/cosmos/ethermint/rpc/args"
emint "github.com/cosmos/ethermint/types"
etypes "github.com/cosmos/ethermint/types"
"github.com/cosmos/ethermint/utils"
"github.com/cosmos/ethermint/version"
"github.com/cosmos/ethermint/x/evm"
@@ -23,7 +24,6 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
ethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
@@ -32,7 +32,6 @@ import (
sdk "github.com/cosmos/cosmos-sdk/types"
authutils "github.com/cosmos/cosmos-sdk/x/auth/client/utils"
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
"github.com/spf13/viper"
)
@@ -249,7 +248,7 @@ func (e *PublicEthAPI) Sign(address common.Address, data hexutil.Bytes) (hexutil
}
// SendTransaction sends an Ethereum transaction.
func (e *PublicEthAPI) SendTransaction(args args.SendTxArgs) (common.Hash, error) {
func (e *PublicEthAPI) SendTransaction(args params.SendTxArgs) (common.Hash, error) {
// TODO: Change this functionality to find an unlocked account by address
if e.key == nil || !bytes.Equal(e.key.PubKey().Address().Bytes(), args.From.Bytes()) {
return common.Hash{}, keystore.ErrLocked
@@ -262,7 +261,7 @@ func (e *PublicEthAPI) SendTransaction(args args.SendTxArgs) (common.Hash, error
}
// Assemble transaction from fields
tx, err := types.GenerateFromArgs(args, e.cliCtx)
tx, err := e.GenerateFromArgs(args)
if err != nil {
return common.Hash{}, err
}
@@ -341,8 +340,14 @@ type CallArgs struct {
// Call performs a raw contract call.
func (e *PublicEthAPI) Call(args CallArgs, blockNr rpc.BlockNumber, overrides *map[common.Address]account) (hexutil.Bytes, error) {
result, err := e.doCall(args, blockNr, vm.Config{}, big.NewInt(emint.DefaultRPCGasLimit))
return (hexutil.Bytes)(result), err
result, err := e.doCall(args, blockNr, big.NewInt(emint.DefaultRPCGasLimit))
if err != nil {
return []byte{}, err
}
_, _, ret, err := types.DecodeReturnData(result.Data)
return (hexutil.Bytes)(ret), err
}
// account indicates the overriding fields of account during the execution of
@@ -360,7 +365,7 @@ type account struct {
}
// DoCall performs a simulated call operation through the evm
func (e *PublicEthAPI) doCall(args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config, globalGasCap *big.Int) ([]byte, error) {
func (e *PublicEthAPI) doCall(args CallArgs, blockNr rpc.BlockNumber, globalGasCap *big.Int) (sdk.Result, error) {
// Set height for historical queries
ctx := e.cliCtx.WithHeight(blockNr.Int64())
@@ -421,28 +426,31 @@ func (e *PublicEthAPI) doCall(args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.C
txEncoder := authutils.GetTxEncoder(ctx.Codec)
txBytes, err := txEncoder(tx)
if err != nil {
return []byte{}, err
return sdk.Result{}, err
}
// Transaction simulation through query
res, _, err := ctx.QueryWithData("app/simulate", txBytes)
if err != nil {
return []byte{}, err
return sdk.Result{}, err
}
var simResult sdk.Result
if err = ctx.Codec.UnmarshalBinaryLengthPrefixed(res, &simResult); err != nil {
return nil, err
if err = e.cliCtx.Codec.UnmarshalBinaryLengthPrefixed(res, &simResult); err != nil {
return sdk.Result{}, err
}
_, _, ret, err := types.DecodeReturnData(simResult.Data)
return ret, err
return simResult, nil
}
// EstimateGas estimates gas usage for the given smart contract call.
func (e *PublicEthAPI) EstimateGas(args CallArgs, blockNum BlockNumber) hexutil.Uint64 {
return 0
func (e *PublicEthAPI) EstimateGas(args CallArgs, blockNr rpc.BlockNumber) (hexutil.Uint64, error) {
result, err := e.doCall(args, blockNr, big.NewInt(emint.DefaultRPCGasLimit))
if err != nil {
return 0, err
}
return hexutil.Uint64(result.GasUsed), nil
}
// GetBlockByHash returns the block identified by hash.
@@ -844,3 +852,67 @@ func (e *PublicEthAPI) getGasLimit() (int64, error) {
e.gasLimit = &gasLimit
return gasLimit, nil
}
// GenerateFromArgs populates tx message with args (used in RPC API)
func (e *PublicEthAPI) GenerateFromArgs(args params.SendTxArgs) (msg *types.EthereumTxMsg, err error) {
var nonce uint64
var gasLimit uint64
amount := (*big.Int)(args.Value)
gasPrice := (*big.Int)(args.GasPrice)
if args.GasPrice == nil {
// Set default gas price
// TODO: Change to min gas price from context once available through server/daemon
gasPrice = big.NewInt(etypes.DefaultGasPrice)
}
if args.Nonce == nil {
// Get nonce (sequence) from account
from := sdk.AccAddress(args.From.Bytes())
_, nonce, err = authtypes.NewAccountRetriever(e.cliCtx).GetAccountNumberSequence(from)
if err != nil {
return nil, err
}
} else {
nonce = (uint64)(*args.Nonce)
}
if args.Data != nil && args.Input != nil && !bytes.Equal(*args.Data, *args.Input) {
return nil, fmt.Errorf(`both "data" and "input" are set and not equal. Please use "input" to pass transaction call data`)
}
// Sets input to either Input or Data, if both are set and not equal error above returns
var input []byte
if args.Input != nil {
input = *args.Input
} else if args.Data != nil {
input = *args.Data
}
if args.To == nil {
// Contract creation
if len(input) == 0 {
return nil, fmt.Errorf("contract creation without any data provided")
}
}
if args.Gas == nil {
callArgs := CallArgs{
From: &args.From,
To: args.To,
Gas: args.Gas,
GasPrice: args.GasPrice,
Value: args.Value,
Data: args.Data,
}
g, _ := e.EstimateGas(callArgs, rpc.BlockNumber(e.cliCtx.Height))
gasLimit = uint64(g)
} else {
gasLimit = (uint64)(*args.Gas)
}
return types.NewEthereumTxMsg(nonce, args.To, amount, gasLimit, gasPrice, input), nil
}