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🚧 Add initial implementation to interact with contracts on chain
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package chain | ||
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| import ( | ||
| "math/big" | ||
|
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| "github.com/LiskHQ/op-fault-detector/pkg/log" | ||
| "github.com/ethereum/go-ethereum/accounts/abi/bind" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/ethclient" | ||
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| "github.com/ethereum-optimism/optimism/op-bindings/bindings" | ||
| ) | ||
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| func GetOracleAddress(l2ChainID int) string { | ||
| ContractAddresses := getContractAddresses() | ||
| address := ContractAddresses[l2ChainID]["l1"].L2OutputOracle | ||
| return address | ||
| } | ||
|
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| // TODO: Create oracle Struct with required functions | ||
| func OracleContractInstance(client *ethclient.Client, l2ChainID int, log log.Logger) (*bindings.L2OutputOracle, error) { | ||
| oracleContractAddress := GetOracleAddress(l2ChainID) | ||
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| contract, err := bindings.NewL2OutputOracle(common.HexToAddress(oracleContractAddress), client) | ||
|
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| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return contract, nil | ||
| } | ||
|
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| // TODO: Use EthClientInterface | ||
| func CreateContractInstance(url string, l2ChainID int) *bindings.L2OutputOracle { | ||
| logger, err := log.NewDefaultProductionLogger() | ||
| if err != nil { | ||
| logger.Errorf("Error occurred %w", err) | ||
| } | ||
|
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| client, err := ethclient.Dial(url) | ||
|
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| if err != nil { | ||
| logger.Errorf("Error occurred while connecting %w", err) | ||
| } | ||
|
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| contract, err := OracleContractInstance(client, l2ChainID, logger) | ||
|
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| if err != nil { | ||
| logger.Errorf("Error occurred while creating contract instance %w", err) | ||
| } | ||
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| return contract | ||
| } | ||
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| func GetNextOutputIndex(contractInstance *bindings.L2OutputOracle, log log.Logger) *big.Int { | ||
| nextOutputIndex, err := contractInstance.NextOutputIndex(&bind.CallOpts{}) | ||
|
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| if err != nil { | ||
| log.Errorf("Error occurred while retrieving next output index %w", err) | ||
| } | ||
|
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| return nextOutputIndex | ||
| } | ||
|
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| func GetL2Output(contractInstance *bindings.L2OutputOracle, index *big.Int, log log.Logger) bindings.TypesOutputProposal { | ||
| l2Output, err := contractInstance.GetL2Output(&bind.CallOpts{}, index) | ||
|
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| if err != nil { | ||
| log.Errorf("Error occurred while retrieving L2 outout %w", err) | ||
| } | ||
|
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| return l2Output | ||
| } |