From 94903d572b4ee72c7ea62ce9856f51def85fdd2a Mon Sep 17 00:00:00 2001 From: rjl493456442 Date: Thu, 24 Aug 2017 11:18:21 +0800 Subject: [PATCH] internal, accounts, eth: utilize vm failed flag to help gas estimation --- accounts/abi/bind/backends/simulated.go | 24 +++++++++--------- eth/api.go | 4 +-- internal/ethapi/api.go | 33 ++++++++++++++----------- 3 files changed, 33 insertions(+), 28 deletions(-) diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go index d6d16eb3f..0621e81c2 100644 --- a/accounts/abi/bind/backends/simulated.go +++ b/accounts/abi/bind/backends/simulated.go @@ -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. diff --git a/eth/api.go b/eth/api.go index d64e4e6c7..e91f51bb9 100644 --- a/eth/api.go +++ b/eth/api.go @@ -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 ðapi.ExecutionResult{ Gas: gas, + Failed: failed, ReturnValue: fmt.Sprintf("%x", ret), StructLogs: ethapi.FormatLogs(tracer.StructLogs()), }, nil diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go index ab8478929..1ffb5a180 100644 --- a/internal/ethapi/api.go +++ b/internal/ethapi/api.go @@ -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"` }