/
contract_transmitter.go
209 lines (184 loc) · 7.14 KB
/
contract_transmitter.go
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package evm
import (
"context"
"database/sql"
"encoding/hex"
"math/big"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
gethcommon "github.com/ethereum/go-ethereum/common"
"github.com/pkg/errors"
"github.com/smartcontractkit/libocr/offchainreporting2plus/chains/evmutil"
ocrtypes "github.com/smartcontractkit/libocr/offchainreporting2plus/types"
"github.com/smartcontractkit/chainlink/v2/core/chains/evm/logpoller"
"github.com/smartcontractkit/chainlink/v2/core/chains/evm/txmgr"
"github.com/smartcontractkit/chainlink/v2/core/chains/evm/utils"
"github.com/smartcontractkit/chainlink/v2/core/logger"
"github.com/smartcontractkit/chainlink/v2/core/services"
"github.com/smartcontractkit/chainlink/v2/core/services/pg"
)
type ContractTransmitter interface {
services.ServiceCtx
ocrtypes.ContractTransmitter
}
var _ ContractTransmitter = &contractTransmitter{}
type Transmitter interface {
CreateEthTransaction(ctx context.Context, toAddress gethcommon.Address, payload []byte, txMeta *txmgr.TxMeta) error
FromAddress() gethcommon.Address
}
type ReportToEthMetadata func([]byte) (*txmgr.TxMeta, error)
func reportToEvmTxMetaNoop([]byte) (*txmgr.TxMeta, error) {
return nil, nil
}
type contractTransmitter struct {
contractAddress gethcommon.Address
contractABI abi.ABI
transmitter Transmitter
transmittedEventSig common.Hash
contractReader contractReader
lp logpoller.LogPoller
lggr logger.Logger
reportToEvmTxMeta ReportToEthMetadata
}
func transmitterFilterName(addr common.Address) string {
return logpoller.FilterName("OCR ContractTransmitter", addr.String())
}
func NewOCRContractTransmitter(
address gethcommon.Address,
caller contractReader,
contractABI abi.ABI,
transmitter Transmitter,
lp logpoller.LogPoller,
lggr logger.Logger,
reportToEvmTxMeta ReportToEthMetadata,
) (*contractTransmitter, error) {
transmitted, ok := contractABI.Events["Transmitted"]
if !ok {
return nil, errors.New("invalid ABI, missing transmitted")
}
err := lp.RegisterFilter(logpoller.Filter{Name: transmitterFilterName(address), EventSigs: []common.Hash{transmitted.ID}, Addresses: []common.Address{address}})
if err != nil {
return nil, err
}
if reportToEvmTxMeta == nil {
reportToEvmTxMeta = reportToEvmTxMetaNoop
}
return &contractTransmitter{
contractAddress: address,
contractABI: contractABI,
transmitter: transmitter,
transmittedEventSig: transmitted.ID,
lp: lp,
contractReader: caller,
lggr: lggr.Named("OCRContractTransmitter"),
reportToEvmTxMeta: reportToEvmTxMeta,
}, nil
}
// Transmit sends the report to the on-chain smart contract's Transmit method.
func (oc *contractTransmitter) Transmit(ctx context.Context, reportCtx ocrtypes.ReportContext, report ocrtypes.Report, signatures []ocrtypes.AttributedOnchainSignature) error {
var rs [][32]byte
var ss [][32]byte
var vs [32]byte
if len(signatures) > 32 {
return errors.New("too many signatures, maximum is 32")
}
for i, as := range signatures {
r, s, v, err := evmutil.SplitSignature(as.Signature)
if err != nil {
panic("eventTransmit(ev): error in SplitSignature")
}
rs = append(rs, r)
ss = append(ss, s)
vs[i] = v
}
rawReportCtx := evmutil.RawReportContext(reportCtx)
txMeta, err := oc.reportToEvmTxMeta(report)
if err != nil {
oc.lggr.Warnw("failed to generate tx metadata for report", "err", err)
}
oc.lggr.Debugw("Transmitting report", "report", hex.EncodeToString(report), "rawReportCtx", rawReportCtx, "contractAddress", oc.contractAddress, "txMeta", txMeta)
payload, err := oc.contractABI.Pack("transmit", rawReportCtx, []byte(report), rs, ss, vs)
if err != nil {
return errors.Wrap(err, "abi.Pack failed")
}
return errors.Wrap(oc.transmitter.CreateEthTransaction(ctx, oc.contractAddress, payload, txMeta), "failed to send Eth transaction")
}
type contractReader interface {
CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error)
}
func parseTransmitted(log []byte) ([32]byte, uint32, error) {
var args abi.Arguments = []abi.Argument{
{
Name: "configDigest",
Type: utils.MustAbiType("bytes32", nil),
},
{
Name: "epoch",
Type: utils.MustAbiType("uint32", nil),
},
}
transmitted, err := args.Unpack(log)
if err != nil {
return [32]byte{}, 0, err
}
if len(transmitted) < 2 {
return [32]byte{}, 0, errors.New("transmitted event log has too few arguments")
}
configDigest := *abi.ConvertType(transmitted[0], new([32]byte)).(*[32]byte)
epoch := *abi.ConvertType(transmitted[1], new(uint32)).(*uint32)
return configDigest, epoch, err
}
func callContract(ctx context.Context, addr common.Address, contractABI abi.ABI, method string, args []interface{}, caller contractReader) ([]interface{}, error) {
input, err := contractABI.Pack(method, args...)
if err != nil {
return nil, err
}
output, err := caller.CallContract(ctx, ethereum.CallMsg{To: &addr, Data: input}, nil)
if err != nil {
return nil, err
}
return contractABI.Unpack(method, output)
}
// LatestConfigDigestAndEpoch retrieves the latest config digest and epoch from the OCR2 contract.
// It is plugin independent, in particular avoids use of the plugin specific generated evm wrappers
// by using the evm client Call directly for functions/events that are part of OCR2Abstract.
func (oc *contractTransmitter) LatestConfigDigestAndEpoch(ctx context.Context) (ocrtypes.ConfigDigest, uint32, error) {
latestConfigDigestAndEpoch, err := callContract(ctx, oc.contractAddress, oc.contractABI, "latestConfigDigestAndEpoch", nil, oc.contractReader)
if err != nil {
return ocrtypes.ConfigDigest{}, 0, err
}
// Panic on these conversions erroring, would mean a broken contract.
scanLogs := *abi.ConvertType(latestConfigDigestAndEpoch[0], new(bool)).(*bool)
configDigest := *abi.ConvertType(latestConfigDigestAndEpoch[1], new([32]byte)).(*[32]byte)
epoch := *abi.ConvertType(latestConfigDigestAndEpoch[2], new(uint32)).(*uint32)
if !scanLogs {
return configDigest, epoch, nil
}
// Otherwise, we have to scan for the logs.
if err != nil {
return ocrtypes.ConfigDigest{}, 0, err
}
latest, err := oc.lp.LatestLogByEventSigWithConfs(
oc.transmittedEventSig, oc.contractAddress, 1, pg.WithParentCtx(ctx))
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
// No transmissions yet
return configDigest, 0, nil
}
return ocrtypes.ConfigDigest{}, 0, err
}
return parseTransmitted(latest.Data)
}
// FromAccount returns the account from which the transmitter invokes the contract
func (oc *contractTransmitter) FromAccount() (ocrtypes.Account, error) {
return ocrtypes.Account(oc.transmitter.FromAddress().String()), nil
}
func (oc *contractTransmitter) Start(ctx context.Context) error { return nil }
func (oc *contractTransmitter) Close() error { return nil }
// Has no state/lifecycle so it's always healthy and ready
func (oc *contractTransmitter) Ready() error { return nil }
func (oc *contractTransmitter) HealthReport() map[string]error {
return map[string]error{oc.Name(): nil}
}
func (oc *contractTransmitter) Name() string { return oc.lggr.Name() }