dione/rpcclient/ethereum.go

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package rpcclient
import (
"context"
"math/big"
"github.com/Secured-Finance/dione/contracts/aggregator"
"github.com/Secured-Finance/dione/contracts/oracleemitter"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/event"
)
type EthereumClient struct {
client *ethclient.Client
authTransactor *bind.TransactOpts
oracleEmitter *oracleemitter.SmartcontractsSession
aggregator *aggregator.SmartcontractsSession
}
type OracleEvent struct {
RequestType string
CallbackAddress common.Address
CallbackMethodID [4]byte
RequestID *big.Int
}
type Ethereum interface {
Initialize(ctx context.Context, url, connectionType, privateKey, oracleEmitterContractAddress, aggregatorContractAddress string) error
Balance(context.Context, string) (*big.Int, error)
SubscribeOnSmartContractEvents(context.Context, string)
SubmitRequestAnswer(reqID *big.Int, data string, callbackAddress common.Address, callbackMethodID [4]byte) error
}
func NewEthereumClient() *EthereumClient {
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ethereumClient := &EthereumClient{}
return ethereumClient
}
func (c *EthereumClient) Initialize(ctx context.Context, url, privateKey, oracleEmitterContractAddress, aggregatorContractAddress string) error {
client, err := ethclient.Dial(url)
if err != nil {
return err
}
c.client = client
ecdsaKey, err := crypto.HexToECDSA(privateKey)
if err != nil {
return err
}
authTransactor := bind.NewKeyedTransactor(ecdsaKey)
c.authTransactor = authTransactor
oracleEmitter, err := oracleemitter.NewSmartcontracts(common.HexToAddress(oracleEmitterContractAddress), client)
if err != nil {
return err
}
aggregatorPlainSC, err := aggregator.NewSmartcontracts(common.HexToAddress(aggregatorContractAddress), client)
if err != nil {
return err
}
c.oracleEmitter = &oracleemitter.SmartcontractsSession{
Contract: oracleEmitter,
CallOpts: bind.CallOpts{
Pending: true,
From: authTransactor.From,
Context: context.Background(),
},
TransactOpts: bind.TransactOpts{
From: authTransactor.From,
Signer: authTransactor.Signer,
GasLimit: 0, // 0 automatically estimates gas limit
GasPrice: nil, // nil automatically suggests gas price
Context: context.Background(),
},
}
c.aggregator = &aggregator.SmartcontractsSession{
Contract: aggregatorPlainSC,
CallOpts: bind.CallOpts{
Pending: true,
From: authTransactor.From,
Context: context.Background(),
},
TransactOpts: bind.TransactOpts{
From: authTransactor.From,
Signer: authTransactor.Signer,
GasLimit: 0, // 0 automatically estimates gas limit
GasPrice: nil, // nil automatically suggests gas price
Context: context.Background(),
},
}
return nil
}
// // Balance returns the balance of the given ethereum address.
// func (c *EthereumClient) Balance(ctx context.Context, address string) (*big.Int, error) {
// ethereumAddress := common.HexToAddress(address)
// value, err := c.HttpClient.BalanceAt(ctx, ethereumAddress, nil)
// if err != nil {
// return nil, err
// }
// return value, nil
// }
// func (c *EthereumClient) SendTransaction(ctx context.Context, private_key, to string, amount int64) string {
// privateKey, err := crypto.HexToECDSA(private_key)
// if err != nil {
// c.Logger.Fatal("Failed to parse private key", err)
// }
// publicKey := privateKey.Public()
// publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
// if !ok {
// c.Logger.Fatal("Cannot assert type: publicKey is not of type *ecdsa.PublicKey", err)
// }
// fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
// nonce, err := c.HttpClient.PendingNonceAt(ctx, fromAddress)
// if err != nil {
// c.Logger.Fatal("Failed to generate wallet nonce value", err)
// }
// value := big.NewInt(amount)
// gasLimit := uint64(21000) // in units
// gasPrice, err := c.HttpClient.SuggestGasPrice(ctx)
// if err != nil {
// c.Logger.Fatal("Failed to suggest new gas price", err)
// }
// toAddress := common.HexToAddress(to)
// var data []byte
// tx := types.NewTransaction(nonce, toAddress, value, gasLimit, gasPrice, data)
// chainID, err := c.HttpClient.NetworkID(ctx)
// if err != nil {
// c.Logger.Fatal("Failed to get network ID", err)
// }
// signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), privateKey)
// if err != nil {
// c.Logger.Fatal("Failed to sign transaction", err)
// }
// err = c.HttpClient.SendTransaction(ctx, signedTx)
// if err != nil {
// c.Logger.Fatal("Failed to send signed transaction", err)
// }
// TxHash := signedTx.Hash().Hex()
// c.Logger.Info("Transaction sent: %s", TxHash)
// return TxHash
// }
// func (c *EthereumClient) GenerateAddressFromPrivateKey(private_key string) string {
// privateKey, err := crypto.HexToECDSA(private_key)
// if err != nil {
// c.Logger.Fatal("Failed to generate private key", err)
// }
// publicKey := privateKey.Public()
// publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
// if !ok {
// c.Logger.Fatal("cannot assert type: publicKey is not of type *ecdsa.PublicKey")
// }
// publicKeyBytes := crypto.FromECDSAPub(publicKeyECDSA)
// c.Logger.Info(hexutil.Encode(publicKeyBytes)[4:])
// address := crypto.PubkeyToAddress(*publicKeyECDSA).Hex()
// return address
// }
func (c *EthereumClient) SubscribeOnOracleEvents(incomingEventsChan chan *oracleemitter.SmartcontractsNewOracleRequest) (event.Subscription, error) {
requestsFilter := c.oracleEmitter.Contract.SmartcontractsFilterer
subscription, err := requestsFilter.WatchNewOracleRequest(&bind.WatchOpts{
Start: nil, //last block
Context: nil,
}, incomingEventsChan)
if err != nil {
return nil, err
}
return subscription, err
}
func (c *EthereumClient) SubmitRequestAnswer(reqID *big.Int, data string, callbackAddress common.Address, callbackMethodID [4]byte) error {
// privateKey, err := crypto.HexToECDSA(private_key)
// if err != nil {
// c.Logger.Fatal("Failed to generate private key", err)
// }
// publicKey := privateKey.Public()
// publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
// if !ok {
// c.Logger.Fatal("cannot assert type: publicKey is not of type *ecdsa.PublicKey")
// }
// publicKeyBytes := crypto.FromECDSAPub(publicKeyECDSA)
// c.Logger.Info(hexutil.Encode(publicKeyBytes)[4:])
// fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
// nonce, err := c.HttpClient.PendingNonceAt(ctx, fromAddress)
// if err != nil {
// c.Logger.Fatal(err)
// }
// gasPrice, err := c.HttpClient.SuggestGasPrice(ctx)
// if err != nil {
// c.Logger.Fatal(err)
// }
_, err := c.aggregator.CollectData(reqID, data, callbackAddress, callbackMethodID)
if err != nil {
return err
}
return nil
}