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operator.go
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/
operator.go
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package operator
import (
"bytes"
"context"
"crypto/ecdsa"
"encoding/hex"
"fmt"
"log"
"time"
"github.com/Layr-Labs/eigensdk-go/crypto/bls"
"github.com/Layr-Labs/eigensdk-go/logging"
eigentypes "github.com/Layr-Labs/eigensdk-go/types"
"github.com/consensys/gnark-crypto/ecc"
"github.com/consensys/gnark/backend/plonk"
"github.com/consensys/gnark/backend/witness"
ethcommon "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/event"
"github.com/yetanotherco/aligned_layer/common"
servicemanager "github.com/yetanotherco/aligned_layer/contracts/bindings/AlignedLayerServiceManager"
"github.com/yetanotherco/aligned_layer/core/chainio"
"github.com/yetanotherco/aligned_layer/core/types"
"github.com/yetanotherco/aligned_layer/core/utils"
"golang.org/x/crypto/sha3"
"github.com/yetanotherco/aligned_layer/core/config"
)
type Operator struct {
Config config.OperatorConfig
Address ethcommon.Address
Socket string
Timeout time.Duration
PrivKey *ecdsa.PrivateKey
KeyPair *bls.KeyPair
OperatorId eigentypes.OperatorId
avsSubscriber chainio.AvsSubscriber
NewTaskCreatedChan chan *servicemanager.ContractAlignedLayerServiceManagerNewTaskCreated
Logger logging.Logger
aggRpcClient AggregatorRpcClient
//Socket string
//Timeout time.Duration
}
func NewOperatorFromConfig(configuration config.OperatorConfig) (*Operator, error) {
logger := configuration.BaseConfig.Logger
avsReader, err := chainio.NewAvsReaderFromConfig(configuration.BaseConfig, configuration.EcdsaConfig)
if err != nil {
log.Fatalf("Could not create AVS reader")
}
registered, err := avsReader.IsOperatorRegistered(configuration.Operator.Address)
if err != nil {
log.Fatalf("Could not check if operator is registered")
}
if !registered {
log.Fatalf("Operator is not registered with AlignedLayer AVS")
}
avsSubscriber, err := chainio.NewAvsSubscriberFromConfig(configuration.BaseConfig)
if err != nil {
log.Fatalf("Could not create AVS subscriber")
}
newTaskCreatedChan := make(chan *servicemanager.ContractAlignedLayerServiceManagerNewTaskCreated)
rpcClient, err := NewAggregatorRpcClient(configuration.Operator.AggregatorServerIpPortAddress, logger)
if err != nil {
return nil, fmt.Errorf("Could not create RPC client: %s. Is aggregator running?", err)
}
operatorId := eigentypes.OperatorIdFromKeyPair(configuration.BlsConfig.KeyPair)
address := configuration.Operator.Address
operator := &Operator{
Config: configuration,
Logger: logger,
avsSubscriber: *avsSubscriber,
Address: address,
NewTaskCreatedChan: newTaskCreatedChan,
aggRpcClient: *rpcClient,
OperatorId: operatorId,
// Timeout
// Socket
}
return operator, nil
}
func (o *Operator) SubscribeToNewTasks() event.Subscription {
sub := o.avsSubscriber.SubscribeToNewTasks(o.NewTaskCreatedChan)
return sub
}
func (o *Operator) Start(ctx context.Context) error {
sub := o.SubscribeToNewTasks()
for {
select {
case <-context.Background().Done():
o.Logger.Info("Operator shutting down...")
return nil
case err := <-sub.Err():
o.Logger.Infof("Error in websocket subscription", "err", err)
sub.Unsubscribe()
sub = o.SubscribeToNewTasks()
case newTaskCreatedLog := <-o.NewTaskCreatedChan:
o.Logger.Infof("Received task with index: %d\n", newTaskCreatedLog.TaskIndex)
taskResponse := o.ProcessNewTaskCreatedLog(newTaskCreatedLog)
responseSignature, err := o.SignTaskResponse(taskResponse)
if err != nil {
o.Logger.Errorf("Could not sign task response", "err", err)
}
signedTaskResponse := types.SignedTaskResponse{
TaskResponse: *taskResponse,
BlsSignature: *responseSignature,
OperatorId: o.OperatorId,
}
o.Logger.Infof("Signed hash: %+v", *responseSignature)
go o.aggRpcClient.SendSignedTaskResponseToAggregator(&signedTaskResponse)
}
}
}
// Takes a NewTaskCreatedLog struct as input and returns a TaskResponseHeader struct.
// The TaskResponseHeader struct is the struct that is signed and sent to the contract as a task response.
func (o *Operator) ProcessNewTaskCreatedLog(newTaskCreatedLog *servicemanager.ContractAlignedLayerServiceManagerNewTaskCreated) *servicemanager.AlignedLayerServiceManagerTaskResponse {
proof := newTaskCreatedLog.Task.Proof
proofLen := (uint)(len(proof))
pubInput := newTaskCreatedLog.Task.PubInput
// pubInputLen := (uint)(len(pubInput))
provingSystemId := newTaskCreatedLog.Task.ProvingSystemId
o.Logger.Info("Received new task with proof to verify",
"proof length", proofLen,
"proof first bytes", "0x"+hex.EncodeToString(proof[0:8]),
"proof last bytes", "0x"+hex.EncodeToString(proof[proofLen-8:proofLen]),
"task index", newTaskCreatedLog.TaskIndex,
"task created block", newTaskCreatedLog.Task.TaskCreatedBlock,
)
switch provingSystemId {
case uint16(common.GnarkPlonkBls12_381):
verificationKey := newTaskCreatedLog.Task.VerificationKey
verificationResult := o.verifyPlonkProofBLS12_381(proof, pubInput, verificationKey)
o.Logger.Infof("PLONK BLS12_381 proof verification result: %t", verificationResult)
taskResponse := &servicemanager.AlignedLayerServiceManagerTaskResponse{
TaskIndex: newTaskCreatedLog.TaskIndex,
ProofIsCorrect: verificationResult,
}
return taskResponse
case uint16(common.GnarkPlonkBn254):
verificationKey := newTaskCreatedLog.Task.VerificationKey
verificationResult := o.verifyPlonkProofBN254(proof, pubInput, verificationKey)
o.Logger.Infof("PLONK BN254 proof verification result: %t", verificationResult)
taskResponse := &servicemanager.AlignedLayerServiceManagerTaskResponse{
TaskIndex: newTaskCreatedLog.TaskIndex,
ProofIsCorrect: verificationResult,
}
return taskResponse
default:
o.Logger.Error("Unrecognized proving system ID")
return nil
}
}
// VerifyPlonkProofBLS12_381 verifies a PLONK proof using BLS12-381 curve.
func (o *Operator) verifyPlonkProofBLS12_381(proofBytes []byte, pubInputBytes []byte, verificationKeyBytes []byte) bool {
return o.verifyPlonkProof(proofBytes, pubInputBytes, verificationKeyBytes, ecc.BLS12_381)
}
// VerifyPlonkProofBN254 verifies a PLONK proof using BN254 curve.
func (o *Operator) verifyPlonkProofBN254(proofBytes []byte, pubInputBytes []byte, verificationKeyBytes []byte) bool {
return o.verifyPlonkProof(proofBytes, pubInputBytes, verificationKeyBytes, ecc.BN254)
}
// verifyPlonkProof contains the common proof verification logic.
func (o *Operator) verifyPlonkProof(proofBytes []byte, pubInputBytes []byte, verificationKeyBytes []byte, curve ecc.ID) bool {
proofReader := bytes.NewReader(proofBytes)
proof := plonk.NewProof(curve)
if _, err := proof.ReadFrom(proofReader); err != nil {
o.Logger.Errorf("Could not deserialize proof: %v", err)
return false
}
pubInputReader := bytes.NewReader(pubInputBytes)
pubInput, err := witness.New(curve.ScalarField())
if err != nil {
o.Logger.Errorf("Error instantiating witness: %v", err)
return false
}
if _, err = pubInput.ReadFrom(pubInputReader); err != nil {
o.Logger.Errorf("Could not read PLONK public input: %v", err)
return false
}
verificationKeyReader := bytes.NewReader(verificationKeyBytes)
verificationKey := plonk.NewVerifyingKey(curve)
if _, err = verificationKey.ReadFrom(verificationKeyReader); err != nil {
o.Logger.Errorf("Could not read PLONK verifying key from bytes: %v", err)
return false
}
err = plonk.Verify(proof, verificationKey, pubInput)
return err == nil
}
func (o *Operator) SignTaskResponse(taskResponse *servicemanager.AlignedLayerServiceManagerTaskResponse) (*bls.Signature, error) {
encodedResponseBytes, err := utils.AbiEncodeTaskResponse(*taskResponse)
if err != nil {
return nil, err
}
var taskResponseDigest [32]byte
hasher := sha3.NewLegacyKeccak256()
hasher.Write(encodedResponseBytes)
copy(taskResponseDigest[:], hasher.Sum(nil)[:32])
responseSignature := *o.Config.BlsConfig.KeyPair.SignMessage(taskResponseDigest)
return &responseSignature, nil
}