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WIP: Implement RemoteCadenceArch type for fetching precompiled calls …
…in contract calls
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| package requester | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "math/big" | ||
| "strings" | ||
|
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| "github.com/onflow/cadence" | ||
| errs "github.com/onflow/flow-evm-gateway/models/errors" | ||
| evmImpl "github.com/onflow/flow-go/fvm/evm/impl" | ||
| evmTypes "github.com/onflow/flow-go/fvm/evm/types" | ||
| "github.com/onflow/flow-go/fvm/systemcontracts" | ||
| flowGo "github.com/onflow/flow-go/model/flow" | ||
| gethCommon "github.com/onflow/go-ethereum/common" | ||
| "github.com/onflow/go-ethereum/core/types" | ||
| "github.com/onflow/go-ethereum/crypto" | ||
| ) | ||
|
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| var cadenceArchAddress = gethCommon.HexToAddress("0x0000000000000000000000010000000000000001") | ||
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| type RemoteCadenceArch struct { | ||
| blockHeight uint64 | ||
| client *CrossSporkClient | ||
| chainID flowGo.ChainID | ||
| cachedCalls map[string]evmTypes.Data | ||
| } | ||
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| var _ evmTypes.PrecompiledContract = (*RemoteCadenceArch)(nil) | ||
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| func NewRemoteCadenceArch( | ||
| blockHeight uint64, | ||
| client *CrossSporkClient, | ||
| chainID flowGo.ChainID, | ||
| ) *RemoteCadenceArch { | ||
| return &RemoteCadenceArch{ | ||
| blockHeight: blockHeight, | ||
| client: client, | ||
| chainID: chainID, | ||
| cachedCalls: map[string]evmTypes.Data{}, | ||
| } | ||
| } | ||
|
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| func (rca *RemoteCadenceArch) Address() evmTypes.Address { | ||
| return evmTypes.NewAddress(cadenceArchAddress) | ||
| } | ||
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| func (rca *RemoteCadenceArch) RequiredGas(input []byte) uint64 { | ||
| evmResult, err := rca.runCall(input) | ||
| if err != nil { | ||
| return 0 | ||
| } | ||
|
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| key := hex.EncodeToString(crypto.Keccak256(input)) | ||
| rca.cachedCalls[key] = evmResult.ReturnedData | ||
|
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| return evmResult.GasConsumed | ||
| } | ||
|
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| func (rca *RemoteCadenceArch) Run(input []byte) ([]byte, error) { | ||
| key := hex.EncodeToString(crypto.Keccak256(input)) | ||
| result, ok := rca.cachedCalls[key] | ||
|
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| if !ok { | ||
| evmResult, err := rca.runCall(input) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return evmResult.ReturnedData, nil | ||
| } | ||
|
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| return result, nil | ||
| } | ||
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| func (rca *RemoteCadenceArch) replaceAddresses(script []byte) []byte { | ||
| // make the list of all contracts we should replace address for | ||
| sc := systemcontracts.SystemContractsForChain(rca.chainID) | ||
| contracts := []systemcontracts.SystemContract{sc.EVMContract, sc.FungibleToken, sc.FlowToken} | ||
|
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| s := string(script) | ||
| // iterate over all the import name and address pairs and replace them in script | ||
| for _, contract := range contracts { | ||
| s = strings.ReplaceAll(s, | ||
| fmt.Sprintf("import %s", contract.Name), | ||
| fmt.Sprintf("import %s from %s", contract.Name, contract.Address.HexWithPrefix()), | ||
| ) | ||
| } | ||
|
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| return []byte(s) | ||
| } | ||
|
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| func (rca *RemoteCadenceArch) runCall(input []byte) (*evmTypes.ResultSummary, error) { | ||
| tx := types.NewTx( | ||
| &types.LegacyTx{ | ||
| Nonce: 0, | ||
| To: &cadenceArchAddress, | ||
| Value: big.NewInt(0), | ||
| Gas: 55_000, | ||
| GasPrice: big.NewInt(0), | ||
| Data: input, | ||
| }, | ||
| ) | ||
| encodedTx, err := tx.MarshalBinary() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| hexEncodedTx, err := cadence.NewString(hex.EncodeToString(encodedTx)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| hexEncodedAddress, err := addressToCadenceString(evmTypes.CoinbaseAddress.ToCommon()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| scriptResult, err := rca.client.ExecuteScriptAtBlockHeight( | ||
| context.Background(), | ||
| rca.blockHeight, | ||
| rca.replaceAddresses(dryRunScript), | ||
| []cadence.Value{hexEncodedTx, hexEncodedAddress}, | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| evmResult, err := parseResult(scriptResult) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return evmResult, nil | ||
| } | ||
|
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| func addressToCadenceString(address gethCommon.Address) (cadence.String, error) { | ||
| return cadence.NewString(strings.TrimPrefix(address.Hex(), "0x")) | ||
| } | ||
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| func parseResult(res cadence.Value) (*evmTypes.ResultSummary, error) { | ||
| result, err := evmImpl.ResultSummaryFromEVMResultValue(res) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode EVM result of type: %s, with: %w", res.Type().ID(), err) | ||
| } | ||
|
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| if result.ErrorCode != 0 { | ||
| if result.ErrorCode == evmTypes.ExecutionErrCodeExecutionReverted { | ||
| return nil, errs.NewRevertError(result.ReturnedData) | ||
| } | ||
| return nil, errs.NewFailedTransactionError(result.ErrorMessage) | ||
| } | ||
|
|
||
| return result, err | ||
| } |
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