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-rw-r--r--internal/ethapi/api.go62
1 files changed, 42 insertions, 20 deletions
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index cf82cc866..6b11cbc97 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -48,6 +48,8 @@ import (
const defaultGas = 90000
+var emptyHex = "0x"
+
// PublicEthereumAPI provides an API to access Ethereum related information.
// It offers only methods that operate on public data that is freely available to anyone.
type PublicEthereumAPI struct {
@@ -574,12 +576,12 @@ type CallArgs struct {
Data hexutil.Bytes `json:"data"`
}
-func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber) (string, *big.Int, error) {
+func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config) ([]byte, *big.Int, error) {
defer func(start time.Time) { glog.V(logger.Debug).Infof("call took %v", time.Since(start)) }(time.Now())
state, header, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
if state == nil || err != nil {
- return "0x", common.Big0, err
+ return nil, common.Big0, err
}
// Set sender address or use a default if none specified
addr := args.From
@@ -589,40 +591,60 @@ func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr
addr = accounts[0].Address
}
}
- } else {
- addr = args.From
}
// Set default gas & gas price if none were set
gas, gasPrice := args.Gas.ToInt(), args.GasPrice.ToInt()
- if gas.Cmp(common.Big0) == 0 {
+ if gas.BitLen() == 0 {
gas = big.NewInt(50000000)
}
- if gasPrice.Cmp(common.Big0) == 0 {
+ if gasPrice.BitLen() == 0 {
gasPrice = new(big.Int).Mul(big.NewInt(50), common.Shannon)
}
+
+ // Create new call message
msg := types.NewMessage(addr, args.To, 0, args.Value.ToInt(), gas, gasPrice, args.Data, false)
- // Execute the call and return
- vmenv, vmError, err := s.b.GetVMEnv(ctx, msg, state, header)
- if err != nil {
- return "0x", common.Big0, err
+ // Setup context so it may be cancelled the call has completed
+ // or, in case of unmetered gas, setup a context with a timeout.
+ var cancel context.CancelFunc
+ if vmCfg.DisableGasMetering {
+ ctx, cancel = context.WithTimeout(ctx, time.Second*5)
+ } else {
+ ctx, cancel = context.WithCancel(ctx)
}
+ // Make sure the context is cancelled when the call has completed
+ // this makes sure resources are cleaned up.
+ defer func() { cancel() }()
+
+ // 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
+ }
+ // Wait for the context to be done and cancel the evm. Even if the
+ // EVM has finished, cancelling may be done (repeatedly)
+ go func() {
+ select {
+ case <-ctx.Done():
+ evm.Cancel()
+ }
+ }()
+
+ // Setup the gas pool (also for unmetered requests)
+ // and apply the message.
gp := new(core.GasPool).AddGas(common.MaxBig)
- res, gas, err := core.ApplyMessage(vmenv, msg, gp)
+ res, gas, err := core.ApplyMessage(evm, msg, gp)
if err := vmError(); err != nil {
- return "0x", common.Big0, err
- }
- if len(res) == 0 { // backwards compatibility
- return "0x", gas, err
+ return nil, common.Big0, err
}
- return common.ToHex(res), gas, err
+ return res, gas, 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) (string, error) {
- result, _, err := s.doCall(ctx, args, blockNr)
- return result, err
+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})
+ return (hexutil.Bytes)(result), err
}
// EstimateGas returns an estimate of the amount of gas needed to execute the given transaction.
@@ -644,7 +666,7 @@ 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)
+ _, gas, 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 {