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internal/ethapi: use same state for each invocation within EstimateGas (#27505)

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EstimateGas repeatedly executes a transaction, performing a binary search with multiple gas prices to determine proper pricing. Each call retrieves a new copy of the state (https://github.com/ethereum/go-ethereum/blob/master/internal/ethapi/api.go#L1017) . Because the pending/latest state can change during the execution of EstimateGas, this can potentially cause strange behavior (as noted here: https://github.com/ethereum/go-ethereum/pull/27502#issue-1761957009).

This PR modifies EstimateGas to retrieve the state once and use a copy of it for every call invocation it does.
This commit is contained in:
jwasinger 2023-06-20 14:40:18 +02:00 committed by GitHub
parent 1affc1c08d
commit 8c288b528d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 21 additions and 11 deletions
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32
internal/ethapi/api.go
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@ -1011,13 +1011,7 @@ func (context *ChainContext) GetHeader(hash common.Hash, number uint64) *types.H
return header
}
func DoCall(ctx context.Context, b Backend, args TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides *StateOverride, blockOverrides *BlockOverrides, timeout time.Duration, globalGasCap uint64) (*core.ExecutionResult, error) {
defer func(start time.Time) { log.Debug("Executing EVM call finished", "runtime", time.Since(start)) }(time.Now())
state, header, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if state == nil || err != nil {
return nil, err
}
func doCall(ctx context.Context, b Backend, args TransactionArgs, state *state.StateDB, header *types.Header, overrides *StateOverride, blockOverrides *BlockOverrides, timeout time.Duration, globalGasCap uint64) (*core.ExecutionResult, error) {
if err := overrides.Apply(state); err != nil {
return nil, err
}
@ -1068,6 +1062,17 @@ func DoCall(ctx context.Context, b Backend, args TransactionArgs, blockNrOrHash
return result, nil
}
func DoCall(ctx context.Context, b Backend, args TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides *StateOverride, blockOverrides *BlockOverrides, timeout time.Duration, globalGasCap uint64) (*core.ExecutionResult, error) {
defer func(start time.Time) { log.Debug("Executing EVM call finished", "runtime", time.Since(start)) }(time.Now())
state, header, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if state == nil || err != nil {
return nil, err
}
return doCall(ctx, b, args, state, header, overrides, blockOverrides, timeout, globalGasCap)
}
func newRevertError(result *core.ExecutionResult) *revertError {
reason, errUnpack := abi.UnpackRevert(result.Revert())
err := errors.New("execution reverted")
@ -1187,10 +1192,10 @@ func DoEstimateGas(ctx context.Context, b Backend, args TransactionArgs, blockNr
cap = hi
// Create a helper to check if a gas allowance results in an executable transaction
executable := func(gas uint64) (bool, *core.ExecutionResult, error) {
executable := func(gas uint64, state *state.StateDB, header *types.Header) (bool, *core.ExecutionResult, error) {
args.Gas = (*hexutil.Uint64)(&gas)
result, err := DoCall(ctx, b, args, blockNrOrHash, nil, nil, 0, gasCap)
result, err := doCall(ctx, b, args, state, header, nil, nil, 0, gasCap)
if err != nil {
if errors.Is(err, core.ErrIntrinsicGas) {
return true, nil, nil // Special case, raise gas limit
@ -1199,10 +1204,15 @@ func DoEstimateGas(ctx context.Context, b Backend, args TransactionArgs, blockNr
}
return result.Failed(), result, nil
}
state, header, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
if state == nil || err != nil {
return 0, err
}
// Execute the binary search and hone in on an executable gas limit
for lo+1 < hi {
s := state.Copy()
mid := (hi + lo) / 2
failed, _, err := executable(mid)
failed, _, err := executable(mid, s, header)
// 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
@ -1218,7 +1228,7 @@ func DoEstimateGas(ctx context.Context, b Backend, args TransactionArgs, blockNr
}
// Reject the transaction as invalid if it still fails at the highest allowance
if hi == cap {
failed, result, err := executable(hi)
failed, result, err := executable(hi, state, header)
if err != nil {
return 0, err
}