erigon-pulse/cmd/rpcdaemon/commands/eth_call.go

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package commands
import (
"context"
"errors"
"fmt"
"math/big"
"github.com/ledgerwatch/turbo-geth/common"
"github.com/ledgerwatch/turbo-geth/common/hexutil"
"github.com/ledgerwatch/turbo-geth/core"
"github.com/ledgerwatch/turbo-geth/core/rawdb"
"github.com/ledgerwatch/turbo-geth/core/state"
"github.com/ledgerwatch/turbo-geth/core/vm"
"github.com/ledgerwatch/turbo-geth/ethdb"
"github.com/ledgerwatch/turbo-geth/internal/ethapi"
"github.com/ledgerwatch/turbo-geth/log"
"github.com/ledgerwatch/turbo-geth/params"
"github.com/ledgerwatch/turbo-geth/rpc"
"github.com/ledgerwatch/turbo-geth/turbo/rpchelper"
"github.com/ledgerwatch/turbo-geth/turbo/transactions"
)
// Call implements eth_call. Executes a new message call immediately without creating a transaction on the block chain.
func (api *APIImpl) Call(ctx context.Context, args ethapi.CallArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides *map[common.Address]ethapi.Account) (hexutil.Bytes, error) {
dbtx, err := api.dbReader.Begin(ctx, ethdb.RO)
if err != nil {
return nil, err
}
defer dbtx.Rollback()
tx := dbtx.(ethdb.HasTx).Tx()
chainConfig, err := getChainConfig(dbtx)
if err != nil {
return nil, err
}
result, err := transactions.DoCall(ctx, args, tx, api.dbReader, blockNrOrHash, overrides, api.GasCap, chainConfig)
if err != nil {
return nil, err
}
// If the result contains a revert reason, try to unpack and return it.
if len(result.Revert()) > 0 {
return nil, ethapi.NewRevertError(result)
}
return result.Return(), result.Err
}
// EstimateGas implements eth_estimateGas. Returns an estimate of how much gas is necessary to allow the transaction to complete. The transaction will not be added to the blockchain.
func (api *APIImpl) EstimateGas(ctx context.Context, args ethapi.CallArgs) (hexutil.Uint64, error) {
// TODO: fixme: blockNrOrHash := rpc.BlockNumberOrHashWithNumber(rpc.PendingBlockNumber)
hash := rawdb.ReadHeadBlockHash(api.dbReader)
return api.DoEstimateGas(ctx, args, rpc.BlockNumberOrHash{BlockHash: &hash}, big.NewInt(0).SetUint64(api.GasCap))
}
func (api *APIImpl) DoEstimateGas(ctx context.Context, args ethapi.CallArgs, blockNrOrHash rpc.BlockNumberOrHash, gasCap *big.Int) (hexutil.Uint64, error) {
dbtx, err := api.dbReader.Begin(ctx, ethdb.RO)
if err != nil {
return 0, err
}
defer dbtx.Rollback()
tx := dbtx.(ethdb.HasTx).Tx()
// Binary search the gas requirement, as it may be higher than the amount used
var (
lo uint64 = params.TxGas - 1
hi uint64
cap uint64
)
// Use zero address if sender unspecified.
if args.From == nil {
args.From = new(common.Address)
}
blockNumber, hash, err := rpchelper.GetBlockNumber(blockNrOrHash, api.dbReader)
if err != nil {
return 0, err
}
chainConfig, err := getChainConfig(dbtx)
if err != nil {
return 0, err
}
// Determine the highest gas limit can be used during the estimation.
if args.Gas != nil && uint64(*args.Gas) >= params.TxGas {
hi = uint64(*args.Gas)
} else {
// Retrieve the block to act as the gas ceiling
header := rawdb.ReadHeader(api.dbReader, hash, blockNumber)
hi = header.GasLimit
}
// Recap the highest gas limit with account's available balance.
if args.GasPrice != nil && args.GasPrice.ToInt().Uint64() != 0 {
ds := state.NewPlainDBState(tx, blockNumber)
state := state.New(ds)
if state == nil {
return 0, fmt.Errorf("can't get the state for %d", blockNumber)
}
balance := state.GetBalance(*args.From) // from can't be nil
available := balance.ToBig()
if args.Value != nil {
if args.Value.ToInt().Cmp(available) >= 0 {
return 0, errors.New("insufficient funds for transfer")
}
available.Sub(available, args.Value.ToInt())
}
allowance := new(big.Int).Div(available, args.GasPrice.ToInt())
if hi > allowance.Uint64() {
transfer := args.Value
if transfer == nil {
transfer = new(hexutil.Big)
}
log.Warn("Gas estimation capped by limited funds", "original", hi, "balance", balance,
"sent", transfer.ToInt(), "gasprice", args.GasPrice.ToInt(), "fundable", allowance)
hi = allowance.Uint64()
}
}
// Recap the highest gas allowance with specified gascap.
if gasCap != nil && gasCap.Sign() > 0 && hi > gasCap.Uint64() {
log.Warn("Caller gas above allowance, capping", "requested", hi, "cap", gasCap)
hi = gasCap.Uint64()
}
cap = hi
// Create a helper to check if a gas allowance results in an executable transaction
executable := func(gas uint64) (bool, *core.ExecutionResult, error) {
args.Gas = (*hexutil.Uint64)(&gas)
result, err := transactions.DoCall(ctx, args, tx, api.dbReader, blockNrOrHash, nil, api.GasCap, chainConfig)
if err != nil {
if errors.Is(err, core.ErrIntrinsicGas) {
// Special case, raise gas limit
return true, nil, nil
}
// Bail out
return true, nil, err
}
return result.Failed(), result, nil
}
// Execute the binary search and hone in on an executable gas limit
for lo+1 < hi {
mid := (hi + lo) / 2
failed, _, err := executable(mid)
// If the error is not nil(consensus error), it means the provided message
// call or transaction will never be accepted no matter how much gas it is
// assigened. Return the error directly, don't struggle any more.
if err != nil {
return 0, err
}
if failed {
lo = mid
} else {
hi = mid
}
}
// Reject the transaction as invalid if it still fails at the highest allowance
if hi == cap {
failed, result, err := executable(hi)
if err != nil {
return 0, err
}
if failed {
if result != nil && !errors.Is(result.Err, vm.ErrOutOfGas) {
if len(result.Revert()) > 0 {
return 0, ethapi.NewRevertError(result)
}
return 0, result.Err
}
// Otherwise, the specified gas cap is too low
return 0, fmt.Errorf("gas required exceeds allowance (%d)", cap)
}
}
return hexutil.Uint64(hi), nil
}