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eth: return state error via GetEVM #25876

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merged 4 commits into from
Sep 27, 2022
Merged

eth: return state error via GetEVM #25876

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51401fe
make vmError more useful
zhiqiangxu Sep 27, 2022
c02930b
fix for review
zhiqiangxu Sep 27, 2022
9551635
Update api.go
rjl493456442 Sep 27, 2022
6dcdd9d
revert calling site
zhiqiangxu Sep 27, 2022
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3 changes: 1 addition & 2 deletions eth/api_backend.go
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Original file line number Diff line number Diff line change
Expand Up @@ -214,13 +214,12 @@ func (b *EthAPIBackend) GetTd(ctx context.Context, hash common.Hash) *big.Int {
}

func (b *EthAPIBackend) GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header, vmConfig *vm.Config) (*vm.EVM, func() error, error) {
vmError := func() error { return nil }
if vmConfig == nil {
vmConfig = b.eth.blockchain.GetVMConfig()
}
txContext := core.NewEVMTxContext(msg)
context := core.NewEVMBlockContext(header, b.eth.BlockChain(), nil)
return vm.NewEVM(context, txContext, state, b.eth.blockchain.Config(), *vmConfig), vmError, nil
return vm.NewEVM(context, txContext, state, b.eth.blockchain.Config(), *vmConfig), state.Error, nil
}

func (b *EthAPIBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
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7 changes: 3 additions & 4 deletions internal/ethapi/api.go
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Expand Up @@ -987,17 +987,16 @@ func DoCall(ctx context.Context, b Backend, args TransactionArgs, blockNrOrHash
// Execute the message.
gp := new(core.GasPool).AddGas(math.MaxUint64)
result, err := core.ApplyMessage(evm, msg, gp)
if err != nil {
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return result, fmt.Errorf("err: %w (supplied gas %d)", err, msg.Gas())
}
if err := vmError(); err != nil {
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I think there was nothing wrong with this, the way it was. Se https://go.dev/play/p/w3zIAvKsWbV

The err := vmError is scoped, and does not overwrite the outer-scoped err.

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However, I agree that it makes sense to check the returned err first, like this PR does. So I still approve

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Actually, I'm not so sure. So the vmErr will (now) potentially return an underlying error, e.g if a part of the trie could not be loaded.
In a lot of cases, this will also trigger a secondary error during precheck -- typically something will be zero which shouldn't have been.

In this case, the vmErr() is the more interesting error, since it shows the underlying cause ("missing trie node") instead of the effect ("insufficient funds for transfer").

So now I'm leaning towards reverting this change

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Make sense, reverted the calling site.

return nil, err
}

// If the timer caused an abort, return an appropriate error message
if evm.Cancelled() {
return nil, fmt.Errorf("execution aborted (timeout = %v)", timeout)
}
if err != nil {
return result, fmt.Errorf("err: %w (supplied gas %d)", err, msg.Gas())
}
return result, nil
}

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