graphql, ethapi: place gas cap in DoCall

graphql/graphql.go

@@ -856,7 +856,7 @@ func (b *Block) Call(ctx context.Context, args struct {
 		}
 	}
 
-	result, gas, failed, err := ethapi.DoCall(ctx, b.backend, args.Data, *b.num, vm.Config{}, 5*time.Second)
+	result, gas, failed, err := ethapi.DoCall(ctx, b.backend, args.Data, *b.num, vm.Config{}, 5*time.Second, b.backend.RPCGasCap())
 	status := hexutil.Uint64(1)
 	if failed {
 		status = 0
@@ -883,7 +883,7 @@ func (b *Block) EstimateGas(ctx context.Context, args struct {
 		}
 	}
 
-	gas, err := ethapi.DoEstimateGas(ctx, b.backend, args.Data, *b.num)
+	gas, err := ethapi.DoEstimateGas(ctx, b.backend, args.Data, *b.num, b.backend.RPCGasCap())
 	return gas, err
 }
 
@@ -927,7 +927,7 @@ func (p *Pending) Account(ctx context.Context, args struct {
 func (p *Pending) Call(ctx context.Context, args struct {
 	Data ethapi.CallArgs
 }) (*CallResult, error) {
-	result, gas, failed, err := ethapi.DoCall(ctx, p.backend, args.Data, rpc.PendingBlockNumber, vm.Config{}, 5*time.Second)
+	result, gas, failed, err := ethapi.DoCall(ctx, p.backend, args.Data, rpc.PendingBlockNumber, vm.Config{}, 5*time.Second, p.backend.RPCGasCap())
 	status := hexutil.Uint64(1)
 	if failed {
 		status = 0
@@ -942,7 +942,7 @@ func (p *Pending) Call(ctx context.Context, args struct {
 func (p *Pending) EstimateGas(ctx context.Context, args struct {
 	Data ethapi.CallArgs
 }) (hexutil.Uint64, error) {
-	return ethapi.DoEstimateGas(ctx, p.backend, args.Data, rpc.PendingBlockNumber)
+	return ethapi.DoEstimateGas(ctx, p.backend, args.Data, rpc.PendingBlockNumber, p.backend.RPCGasCap())
 }
 
 // Resolver is the top-level object in the GraphQL hierarchy.

internal/ethapi/api.go

@@ -674,7 +674,7 @@ type CallArgs struct {
 	Data     *hexutil.Bytes  `json:"data"`
 }
 
-func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config, timeout time.Duration) ([]byte, uint64, bool, error) {
+func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config, timeout time.Duration, globalGasCap *big.Int) ([]byte, uint64, bool, error) {
 	defer func(start time.Time) { log.Debug("Executing EVM call finished", "runtime", time.Since(start)) }(time.Now())
 
 	state, header, err := b.StateAndHeaderByNumber(ctx, blockNr)
@@ -697,6 +697,10 @@ func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumb
 	if args.Gas != nil {
 		gas = uint64(*args.Gas)
 	}
+	if globalGasCap != nil && globalGasCap.Uint64() < gas {
+		log.Warn("Applying cap on gas, caller requested amount above limit", "cap", globalGasCap, "attempted", gas)
+		gas = globalGasCap.Uint64()
+	}
 	gasPrice := new(big.Int).SetUint64(defaultGasPrice)
 	if args.GasPrice != nil {
 		gasPrice = args.GasPrice.ToInt()
@@ -752,25 +756,11 @@ func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumb
 // 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) {
-	if gasCap := s.b.RPCGasCap(); gasCap != nil {
+	result, _, _, err := DoCall(ctx, s.b, args, blockNr, vm.Config{}, 5*time.Second, s.b.RPCGasCap())
-		if new(big.Int).SetUint64(uint64(*args.Gas)).Cmp(gasCap) > 0 {
-			log.Warn("Applying cap on gas, caller requested amount above limit", "cap", gasCap, "requested", args.Gas)
-			newGas := hexutil.Uint64(gasCap.Uint64())
-			*args.Gas = newGas
-		}
-		result, _, _, err := DoCall(ctx, s.b, args, blockNr, vm.Config{}, 5*time.Second)
-		if err != nil {
-			err = fmt.Errorf("%v (gas capped at: %d)", err, *args.Gas)
-		}
-		return (hexutil.Bytes)(result), err
-	} else {
-		result, _, _, err := DoCall(ctx, s.b, args, blockNr, vm.Config{}, 5*time.Second)
 	return (hexutil.Bytes)(result), err
 }
 
-}
+func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber, gasCap *big.Int) (hexutil.Uint64, error) {
-
-func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber) (hexutil.Uint64, error) {
 	// Binary search the gas requirement, as it may be higher than the amount used
 	var (
 		lo  uint64 = params.TxGas - 1
@@ -787,13 +777,17 @@ func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.Bl
 		}
 		hi = block.GasLimit()
 	}
+	if gasCap != nil && hi > gasCap.Uint64() {
+		log.Warn("Applying cap on gas, caller requested amount above limit", "cap", gasCap, "attempted", hi)
+		hi = gasCap.Uint64()
+	}
 	cap = hi
 
 	// Create a helper to check if a gas allowance results in an executable transaction
 	executable := func(gas uint64) bool {
 		args.Gas = (*hexutil.Uint64)(&gas)
 
-		_, _, failed, err := DoCall(ctx, b, args, rpc.PendingBlockNumber, vm.Config{}, 0)
+		_, _, failed, err := DoCall(ctx, b, args, rpc.PendingBlockNumber, vm.Config{}, 0, gasCap)
 		if err != nil || failed {
 			return false
 		}
@@ -820,14 +814,7 @@ func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.Bl
 // EstimateGas returns an estimate of the amount of gas needed to execute the
 // given transaction against the current pending block.
 func (s *PublicBlockChainAPI) EstimateGas(ctx context.Context, args CallArgs) (hexutil.Uint64, error) {
-	if gasCap := s.b.RPCGasCap(); gasCap != nil {
+	return DoEstimateGas(ctx, s.b, args, rpc.PendingBlockNumber, s.b.RPCGasCap())
-		if new(big.Int).SetUint64(uint64(*args.Gas)).Cmp(gasCap) > 0 {
-			log.Warn("Applying cap on gas, caller requested amount above limit", "cap", gasCap, "requested", args.Gas)
-			newGas := hexutil.Uint64(gasCap.Uint64())
-			*args.Gas = newGas
-		}
-	}
-	return DoEstimateGas(ctx, s.b, args, rpc.PendingBlockNumber)
 }
 
 // ExecutionResult groups all structured logs emitted by the EVM