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task.vrfv2.go
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task.vrfv2.go
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package pipeline
import (
"bytes"
"context"
"encoding/hex"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/pkg/errors"
"go.uber.org/multierr"
evmtypes "github.com/smartcontractkit/chainlink/v2/core/chains/evm/types"
"github.com/smartcontractkit/chainlink/v2/core/gethwrappers/generated/vrf_coordinator_v2"
"github.com/smartcontractkit/chainlink/v2/core/logger"
"github.com/smartcontractkit/chainlink/v2/core/services/signatures/secp256k1"
"github.com/smartcontractkit/chainlink/v2/core/services/vrf/proof"
)
var (
vrfCoordinatorV2ABI = evmtypes.MustGetABI(vrf_coordinator_v2.VRFCoordinatorV2ABI)
)
type VRFTaskV2 struct {
BaseTask `mapstructure:",squash"`
PublicKey string `json:"publicKey"`
RequestBlockHash string `json:"requestBlockHash"`
RequestBlockNumber string `json:"requestBlockNumber"`
Topics string `json:"topics"`
keyStore VRFKeyStore
}
var _ Task = (*VRFTaskV2)(nil)
func (t *VRFTaskV2) Type() TaskType {
return TaskTypeVRFV2
}
func (t *VRFTaskV2) Run(_ context.Context, _ logger.Logger, vars Vars, inputs []Result) (result Result, runInfo RunInfo) {
if len(inputs) != 1 {
return Result{Error: ErrWrongInputCardinality}, runInfo
}
if inputs[0].Error != nil {
return Result{Error: ErrInputTaskErrored}, runInfo
}
logValues, ok := inputs[0].Value.(map[string]interface{})
if !ok {
return Result{Error: errors.Wrap(ErrBadInput, "expected map input")}, runInfo
}
var (
pubKey BytesParam
requestBlockHash BytesParam
requestBlockNumber Uint64Param
topics HashSliceParam
)
err := multierr.Combine(
errors.Wrap(ResolveParam(&pubKey, From(VarExpr(t.PublicKey, vars))), "publicKey"),
errors.Wrap(ResolveParam(&requestBlockHash, From(VarExpr(t.RequestBlockHash, vars))), "requestBlockHash"),
errors.Wrap(ResolveParam(&requestBlockNumber, From(VarExpr(t.RequestBlockNumber, vars))), "requestBlockNumber"),
errors.Wrap(ResolveParam(&topics, From(VarExpr(t.Topics, vars))), "topics"),
)
if err != nil {
return Result{Error: err}, runInfo
}
requestKeyHash, ok := logValues["keyHash"].([32]byte)
if !ok {
return Result{Error: errors.Wrapf(ErrBadInput, "invalid keyHash")}, runInfo
}
requestPreSeed, ok := logValues["preSeed"].(*big.Int)
if !ok {
return Result{Error: errors.Wrapf(ErrBadInput, "invalid preSeed")}, runInfo
}
requestId, ok := logValues["requestId"].(*big.Int)
if !ok {
return Result{Error: errors.Wrapf(ErrBadInput, "invalid requestId")}, runInfo
}
subID, ok := logValues["subId"].(uint64)
if !ok {
return Result{Error: errors.Wrapf(ErrBadInput, "invalid subId")}, runInfo
}
callbackGasLimit, ok := logValues["callbackGasLimit"].(uint32)
if !ok {
return Result{Error: errors.Wrapf(ErrBadInput, "invalid callbackGasLimit")}, runInfo
}
numWords, ok := logValues["numWords"].(uint32)
if !ok {
return Result{Error: errors.Wrapf(ErrBadInput, "invalid numWords")}, runInfo
}
sender, ok := logValues["sender"].(common.Address)
if !ok {
return Result{Error: errors.Wrapf(ErrBadInput, "invalid sender")}, runInfo
}
pk, err := secp256k1.NewPublicKeyFromBytes(pubKey)
if err != nil {
return Result{Error: fmt.Errorf("failed to create PublicKey from bytes %v", err)}, runInfo
}
pkh := pk.MustHash()
// Validate the key against the spec
if !bytes.Equal(requestKeyHash[:], pkh[:]) {
return Result{Error: fmt.Errorf("invalid key hash %v expected %v", hex.EncodeToString(requestKeyHash[:]), hex.EncodeToString(pkh[:]))}, runInfo
}
preSeed, err := proof.BigToSeed(requestPreSeed)
if err != nil {
return Result{Error: fmt.Errorf("unable to parse preseed %v", preSeed)}, runInfo
}
if len(requestBlockHash) != common.HashLength {
return Result{Error: fmt.Errorf("invalid BlockHash length %d expected %d", len(requestBlockHash), common.HashLength)}, runInfo
}
preSeedData := proof.PreSeedDataV2{
PreSeed: preSeed,
BlockHash: common.BytesToHash(requestBlockHash),
BlockNum: uint64(requestBlockNumber),
SubId: subID,
CallbackGasLimit: callbackGasLimit,
NumWords: numWords,
Sender: sender,
}
finalSeed := proof.FinalSeedV2(preSeedData)
id := hexutil.Encode(pk[:])
p, err := t.keyStore.GenerateProof(id, finalSeed)
if err != nil {
return Result{Error: err}, retryableRunInfo()
}
onChainProof, rc, err := proof.GenerateProofResponseFromProofV2(p, preSeedData)
if err != nil {
return Result{Error: err}, retryableRunInfo()
}
b, err := vrfCoordinatorV2ABI.Pack("fulfillRandomWords", onChainProof, rc)
if err != nil {
return Result{Error: err}, runInfo
}
results := make(map[string]interface{})
results["output"] = hexutil.Encode(b)
// RequestID needs to be a [32]byte for EvmTxMeta.
results["requestID"] = hexutil.Encode(requestId.Bytes())
// store vrf proof and request commitment separately so they can be used in a batch fashion
results["proof"] = onChainProof
results["requestCommitment"] = rc
return Result{Value: results}, runInfo
}