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internal, accounts, eth: utilize vm failed flag to help gas estimation

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rjl493456442 2017-08-24 11:18:21 +08:00 committed by Péter Szilágyi
parent f86c4177d5
commit 94903d572b
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GPG Key ID: E9AE538CEDF8293D
3 changed files with 33 additions and 28 deletions
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24
accounts/abi/bind/backends/simulated.go
View File

@ -168,7 +168,7 @@ func (b *SimulatedBackend) CallContract(ctx context.Context, call ethereum.CallM
if err != nil {
return nil, err
}
rval, _, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state)
rval, _, _, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state)
return rval, err
}
@ -178,7 +178,7 @@ func (b *SimulatedBackend) PendingCallContract(ctx context.Context, call ethereu
defer b.mu.Unlock()
defer b.pendingState.RevertToSnapshot(b.pendingState.Snapshot())
rval, _, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
rval, _, _, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
return rval, err
}
@ -204,8 +204,11 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
defer b.mu.Unlock()
// Binary search the gas requirement, as it may be higher than the amount used
var lo, hi uint64
if call.Gas != nil {
var (
lo uint64 = params.TxGas - 1
hi uint64
)
if call.Gas != nil && call.Gas.Uint64() >= params.TxGas {
hi = call.Gas.Uint64()
} else {
hi = b.pendingBlock.GasLimit().Uint64()
@ -216,11 +219,11 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
call.Gas = new(big.Int).SetUint64(mid)
snapshot := b.pendingState.Snapshot()
_, gas, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
_, _, failed, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
b.pendingState.RevertToSnapshot(snapshot)
// If the transaction became invalid or used all the gas (failed), raise the gas limit
if err != nil || gas.Cmp(call.Gas) == 0 {
// If the transaction became invalid or execution failed, raise the gas limit
if err != nil || failed {
lo = mid
continue
}
@ -232,7 +235,7 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
// callContract implemens common code between normal and pending contract calls.
// state is modified during execution, make sure to copy it if necessary.
func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) ([]byte, *big.Int, error) {
func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) ([]byte, *big.Int, bool, error) {
// Ensure message is initialized properly.
if call.GasPrice == nil {
call.GasPrice = big.NewInt(1)
@ -254,9 +257,8 @@ func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallM
// about the transaction and calling mechanisms.
vmenv := vm.NewEVM(evmContext, statedb, b.config, vm.Config{})
gaspool := new(core.GasPool).AddGas(math.MaxBig256)
// TODO utilize returned failed flag to help gas estimation.
ret, gasUsed, _, _, err := core.NewStateTransition(vmenv, msg, gaspool).TransitionDb()
return ret, gasUsed, err
ret, gasUsed, _, failed, err := core.NewStateTransition(vmenv, msg, gaspool).TransitionDb()
return ret, gasUsed, failed, err
}
// SendTransaction updates the pending block to include the given transaction.

4
eth/api.go
View File

@ -523,8 +523,7 @@ func (api *PrivateDebugAPI) TraceTransaction(ctx context.Context, txHash common.
// Run the transaction with tracing enabled.
vmenv := vm.NewEVM(context, statedb, api.config, vm.Config{Debug: true, Tracer: tracer})
// TODO utilize failed flag
ret, gas, _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas()))
ret, gas, failed, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas()))
if err != nil {
return nil, fmt.Errorf("tracing failed: %v", err)
}
@ -532,6 +531,7 @@ func (api *PrivateDebugAPI) TraceTransaction(ctx context.Context, txHash common.
case *vm.StructLogger:
return &ethapi.ExecutionResult{
Gas: gas,
Failed: failed,
ReturnValue: fmt.Sprintf("%x", ret),
StructLogs: ethapi.FormatLogs(tracer.StructLogs()),
}, nil

33
internal/ethapi/api.go
View File

@ -580,12 +580,12 @@ type CallArgs struct {
Data hexutil.Bytes `json:"data"`
}
func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config) ([]byte, *big.Int, error) {
func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config) ([]byte, *big.Int, bool, error) {
defer func(start time.Time) { log.Debug("Executing EVM call finished", "runtime", time.Since(start)) }(time.Now())
state, header, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
if state == nil || err != nil {
return nil, common.Big0, err
return nil, common.Big0, false, err
}
// Set sender address or use a default if none specified
addr := args.From
@ -623,7 +623,7 @@ func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr
// Get a new instance of the EVM.
evm, vmError, err := s.b.GetEVM(ctx, msg, state, header, vmCfg)
if err != nil {
return nil, common.Big0, err
return nil, common.Big0, false, err
}
// Wait for the context to be done and cancel the evm. Even if the
// EVM has finished, cancelling may be done (repeatedly)
@ -635,26 +635,28 @@ func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr
// Setup the gas pool (also for unmetered requests)
// and apply the message.
gp := new(core.GasPool).AddGas(math.MaxBig256)
// TODO utilize failed flag to help gas estimation
res, gas, _, err := core.ApplyMessage(evm, msg, gp)
res, gas, failed, err := core.ApplyMessage(evm, msg, gp)
if err := vmError(); err != nil {
return nil, common.Big0, err
return nil, common.Big0, false, err
}
return res, gas, err
return res, gas, failed, err
}
// Call executes the given transaction on the state for the given block number.
// It doesn't make and changes in the state/blockchain and is useful to execute and retrieve values.
func (s *PublicBlockChainAPI) Call(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber) (hexutil.Bytes, error) {
result, _, err := s.doCall(ctx, args, blockNr, vm.Config{DisableGasMetering: true})
result, _, _, err := s.doCall(ctx, args, blockNr, vm.Config{DisableGasMetering: true})
return (hexutil.Bytes)(result), err
}
// EstimateGas returns an estimate of the amount of gas needed to execute the given transaction.
func (s *PublicBlockChainAPI) EstimateGas(ctx context.Context, args CallArgs) (*hexutil.Big, error) {
// Binary search the gas requirement, as it may be higher than the amount used
var lo, hi uint64
if (*big.Int)(&args.Gas).Sign() != 0 {
var (
lo uint64 = params.TxGas - 1
hi uint64
)
if (*big.Int)(&args.Gas).Uint64() >= params.TxGas {
hi = (*big.Int)(&args.Gas).Uint64()
} else {
// Retrieve the current pending block to act as the gas ceiling
@ -669,10 +671,10 @@ func (s *PublicBlockChainAPI) EstimateGas(ctx context.Context, args CallArgs) (*
mid := (hi + lo) / 2
(*big.Int)(&args.Gas).SetUint64(mid)
_, gas, err := s.doCall(ctx, args, rpc.PendingBlockNumber, vm.Config{})
_, _, failed, err := s.doCall(ctx, args, rpc.PendingBlockNumber, vm.Config{})
// If the transaction became invalid or used all the gas (failed), raise the gas limit
if err != nil || gas.Cmp((*big.Int)(&args.Gas)) == 0 {
// If the transaction became invalid or execution failed, raise the gas limit
if err != nil || failed {
lo = mid
continue
}
@ -683,10 +685,11 @@ func (s *PublicBlockChainAPI) EstimateGas(ctx context.Context, args CallArgs) (*
}
// ExecutionResult groups all structured logs emitted by the EVM
// while replaying a transaction in debug mode as well as the amount of
// gas used and the return value
// while replaying a transaction in debug mode as well as transaction
// execution status, the amount of gas used and the return value
type ExecutionResult struct {
Gas *big.Int `json:"gas"`
Failed bool `json:"failed"`
ReturnValue string `json:"returnValue"`
StructLogs []StructLogRes `json:"structLogs"`
}