619 lines
21 KiB
Go
619 lines
21 KiB
Go
package ethereum
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import (
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"context"
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"fmt"
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"github.com/certusone/wormhole/node/pkg/p2p"
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gossipv1 "github.com/certusone/wormhole/node/pkg/proto/gossip/v1"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"sync"
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"sync/atomic"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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eth_common "github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"go.uber.org/zap"
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"github.com/certusone/wormhole/node/pkg/celo"
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"github.com/certusone/wormhole/node/pkg/common"
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"github.com/certusone/wormhole/node/pkg/ethereum/abi"
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"github.com/certusone/wormhole/node/pkg/readiness"
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"github.com/certusone/wormhole/node/pkg/supervisor"
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"github.com/certusone/wormhole/node/pkg/vaa"
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)
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var (
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ethConnectionErrors = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "wormhole_eth_connection_errors_total",
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Help: "Total number of Ethereum connection errors (either during initial connection or while watching)",
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}, []string{"eth_network", "reason"})
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ethMessagesObserved = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "wormhole_eth_messages_observed_total",
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Help: "Total number of Eth messages observed (pre-confirmation)",
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}, []string{"eth_network"})
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ethMessagesOrphaned = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "wormhole_eth_messages_orphaned_total",
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Help: "Total number of Eth messages dropped (orphaned)",
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}, []string{"eth_network", "reason"})
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ethMessagesConfirmed = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "wormhole_eth_messages_confirmed_total",
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Help: "Total number of Eth messages verified (post-confirmation)",
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}, []string{"eth_network"})
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currentEthHeight = promauto.NewGaugeVec(
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prometheus.GaugeOpts{
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Name: "wormhole_eth_current_height",
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Help: "Current Ethereum block height",
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}, []string{"eth_network"})
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queryLatency = promauto.NewHistogramVec(
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prometheus.HistogramOpts{
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Name: "wormhole_eth_query_latency",
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Help: "Latency histogram for Ethereum calls (note that most interactions are streaming queries, NOT calls, and we cannot measure latency for those",
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}, []string{"eth_network", "operation"})
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)
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type (
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Watcher struct {
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// Ethereum RPC url
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url string
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// Address of the Eth contract contract
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contract eth_common.Address
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// Human-readable name of the Eth network, for logging and monitoring.
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networkName string
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// Readiness component
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readiness readiness.Component
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// VAA ChainID of the network we're connecting to.
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chainID vaa.ChainID
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// Channel to send new messages to.
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msgChan chan *common.MessagePublication
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// Channel to send guardian set changes to.
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// setChan can be set to nil if no guardian set changes are needed.
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//
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// We currently only fetch the guardian set from one primary chain, which should
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// have this flag set to true, and false on all others.
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//
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// The current primary chain is Ethereum (a mostly arbitrary decision because it
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// has the best API - we might want to switch the primary chain to Solana once
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// the governance mechanism lives there),
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setChan chan *common.GuardianSet
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// Incoming re-observation requests from the network. Pre-filtered to only
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// include requests for our chainID.
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obsvReqC chan *gossipv1.ObservationRequest
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pending map[pendingKey]*pendingMessage
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pendingMu sync.Mutex
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// 0 is a valid guardian set, so we need a nil value here
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currentGuardianSet *uint32
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// Minimum number of confirmations to accept, regardless of what the contract specifies.
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minConfirmations uint64
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// Interface to the chain specific ethereum library.
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ethIntf common.Ethish
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}
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pendingKey struct {
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TxHash eth_common.Hash
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BlockHash eth_common.Hash
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EmitterAddress vaa.Address
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Sequence uint64
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}
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pendingMessage struct {
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message *common.MessagePublication
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height uint64
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}
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)
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func NewEthWatcher(
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url string,
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contract eth_common.Address,
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networkName string,
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readiness readiness.Component,
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chainID vaa.ChainID,
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messageEvents chan *common.MessagePublication,
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setEvents chan *common.GuardianSet,
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minConfirmations uint64,
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obsvReqC chan *gossipv1.ObservationRequest,
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unsafeDevMode bool) *Watcher {
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var ethIntf common.Ethish
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if chainID == vaa.ChainIDCelo && ! unsafeDevMode {
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// When we are running in mainnet or testnet, we need to use the Celo ethereum library rather than go-ethereum.
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// However, in devnet, we currently run the standard ETH node for Celo, so we need to use the standard go-ethereum.
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ethIntf = &celo.CeloImpl{NetworkName: networkName}
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} else {
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ethIntf = &EthImpl{NetworkName: networkName}
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}
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return &Watcher{
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url: url,
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contract: contract,
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networkName: networkName,
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readiness: readiness,
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minConfirmations: minConfirmations,
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chainID: chainID,
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msgChan: messageEvents,
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setChan: setEvents,
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obsvReqC: obsvReqC,
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pending: map[pendingKey]*pendingMessage{},
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ethIntf: ethIntf}
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}
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func (e *Watcher) Run(ctx context.Context) error {
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logger := supervisor.Logger(ctx)
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e.ethIntf.SetLogger(logger)
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if err := e.checkForSafeMode(ctx); err != nil {
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return err
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}
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// Initialize gossip metrics (we want to broadcast the address even if we're not yet syncing)
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p2p.DefaultRegistry.SetNetworkStats(e.chainID, &gossipv1.Heartbeat_Network{
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ContractAddress: e.contract.Hex(),
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})
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timeout, cancel := context.WithTimeout(ctx, 15*time.Second)
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defer cancel()
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err := e.ethIntf.DialContext(timeout, e.url)
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if err != nil {
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ethConnectionErrors.WithLabelValues(e.networkName, "dial_error").Inc()
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p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
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return fmt.Errorf("dialing eth client failed: %w", err)
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}
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err = e.ethIntf.NewAbiFilterer(e.contract)
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if err != nil {
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return fmt.Errorf("could not create wormhole contract filter: %w", err)
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}
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err = e.ethIntf.NewAbiCaller(e.contract)
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if err != nil {
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panic(err)
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}
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// Timeout for initializing subscriptions
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timeout, cancel = context.WithTimeout(ctx, 15*time.Second)
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defer cancel()
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// Subscribe to new message publications
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messageC := make(chan *abi.AbiLogMessagePublished, 2)
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messageSub, err := e.ethIntf.WatchLogMessagePublished(ctx, timeout, messageC)
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if err != nil {
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ethConnectionErrors.WithLabelValues(e.networkName, "subscribe_error").Inc()
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p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
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return fmt.Errorf("failed to subscribe to message publication events: %w", err)
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}
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// Fetch initial guardian set
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if err := e.fetchAndUpdateGuardianSet(logger, ctx, e.ethIntf); err != nil {
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return fmt.Errorf("failed to request guardian set: %v", err)
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}
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errC := make(chan error)
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// Poll for guardian set.
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go func() {
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t := time.NewTicker(15 * time.Second)
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defer t.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-t.C:
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if err := e.fetchAndUpdateGuardianSet(logger, ctx, e.ethIntf); err != nil {
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errC <- fmt.Errorf("failed to request guardian set: %v", err)
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return
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}
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}
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}
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}()
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// Track the current block number so we can compare it to the block number of
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// the message publication for observation requests.
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var currentBlockNumber uint64
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go func() {
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for {
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select {
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case <-ctx.Done():
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return
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case r := <-e.obsvReqC:
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// This can't happen unless there is a programming error - the caller
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// is expected to send us only requests for our chainID.
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if vaa.ChainID(r.ChainId) != e.chainID {
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panic("invalid chain ID")
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}
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tx := eth_common.BytesToHash(r.TxHash)
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logger.Info("received observation request",
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zap.String("eth_network", e.networkName),
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zap.String("tx_hash", tx.Hex()))
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// SECURITY: Load the block number before requesting the transaction to avoid a
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// race condition where requesting the tx succeeds and is then dropped due to a fork,
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// but blockNumberU had already advanced beyond the required threshold.
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//
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// In the primary watcher flow, this is of no concern since we assume the node
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// always sends the head before it sends the logs (implicit synchronization
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// by relying on the same websocket connection).
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blockNumberU := atomic.LoadUint64(¤tBlockNumber)
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if blockNumberU == 0 {
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logger.Error("no block number available, ignoring observation request",
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zap.String("eth_network", e.networkName))
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continue
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}
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timeout, cancel := context.WithTimeout(ctx, 5*time.Second)
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blockNumber, msgs, err := MessageEventsForTransaction(timeout, e.ethIntf, e.contract, e.chainID, tx)
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cancel()
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if err != nil {
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logger.Error("failed to process observation request",
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zap.Error(err), zap.String("eth_network", e.networkName))
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continue
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}
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for _, msg := range msgs {
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expectedConfirmations := uint64(msg.ConsistencyLevel)
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if expectedConfirmations < e.minConfirmations {
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expectedConfirmations = e.minConfirmations
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}
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// SECURITY: In the recovery flow, we already know which transaction to
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// observe, and we can assume that it has reached the expected finality
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// level a long time ago. Therefore, the logic is much simpler than the
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// primary watcher, which has to wait for finality.
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//
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// Instead, we can simply check if the transaction's block number is in
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// the past by more than the expected confirmation number.
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//
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// Ensure that the current block number is at least expectedConfirmations
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// larger than the message observation's block number.
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if blockNumber+expectedConfirmations <= blockNumberU {
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logger.Info("re-observed message publication transaction",
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zap.Stringer("tx", msg.TxHash),
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zap.Stringer("emitter_address", msg.EmitterAddress),
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zap.Uint64("sequence", msg.Sequence),
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zap.Uint64("current_block", blockNumberU),
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zap.Uint64("observed_block", blockNumber),
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zap.String("eth_network", e.networkName),
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)
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e.msgChan <- msg
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} else {
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logger.Info("ignoring re-observed message publication transaction",
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zap.Stringer("tx", msg.TxHash),
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zap.Stringer("emitter_address", msg.EmitterAddress),
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zap.Uint64("sequence", msg.Sequence),
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zap.Uint64("current_block", blockNumberU),
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zap.Uint64("observed_block", blockNumber),
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zap.Uint64("expected_confirmations", expectedConfirmations),
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zap.String("eth_network", e.networkName),
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)
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}
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}
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}
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}
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}()
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go func() {
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for {
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select {
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case <-ctx.Done():
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return
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case err := <-messageSub.Err():
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ethConnectionErrors.WithLabelValues(e.networkName, "subscription_error").Inc()
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errC <- fmt.Errorf("error while processing message publication subscription: %w", err)
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p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
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return
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case ev := <-messageC:
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// Request timestamp for block
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msm := time.Now()
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timeout, cancel := context.WithTimeout(ctx, 15*time.Second)
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blockTime, err := e.ethIntf.TimeOfBlockByHash(timeout, ev.Raw.BlockHash)
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cancel()
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queryLatency.WithLabelValues(e.networkName, "block_by_number").Observe(time.Since(msm).Seconds())
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if err != nil {
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ethConnectionErrors.WithLabelValues(e.networkName, "block_by_number_error").Inc()
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p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
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errC <- fmt.Errorf("failed to request timestamp for block %d: %w", ev.Raw.BlockNumber, err)
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return
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}
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|
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message := &common.MessagePublication{
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TxHash: ev.Raw.TxHash,
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Timestamp: time.Unix(int64(blockTime), 0),
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Nonce: ev.Nonce,
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Sequence: ev.Sequence,
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EmitterChain: e.chainID,
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EmitterAddress: PadAddress(ev.Sender),
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Payload: ev.Payload,
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ConsistencyLevel: ev.ConsistencyLevel,
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}
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logger.Info("found new message publication transaction",
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zap.Stringer("tx", ev.Raw.TxHash),
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zap.Uint64("block", ev.Raw.BlockNumber),
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zap.Stringer("blockhash", ev.Raw.BlockHash),
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zap.String("eth_network", e.networkName))
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|
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ethMessagesObserved.WithLabelValues(e.networkName).Inc()
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key := pendingKey{
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TxHash: message.TxHash,
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BlockHash: ev.Raw.BlockHash,
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EmitterAddress: message.EmitterAddress,
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Sequence: message.Sequence,
|
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}
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e.pendingMu.Lock()
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e.pending[key] = &pendingMessage{
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message: message,
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height: ev.Raw.BlockNumber,
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}
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e.pendingMu.Unlock()
|
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}
|
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}
|
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}()
|
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|
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// Watch headers
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headSink := make(chan *types.Header, 2)
|
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headerSubscription, err := e.ethIntf.SubscribeNewHead(ctx, headSink)
|
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if err != nil {
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ethConnectionErrors.WithLabelValues(e.networkName, "header_subscribe_error").Inc()
|
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p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
|
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return fmt.Errorf("failed to subscribe to header events: %w", err)
|
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}
|
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|
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go func() {
|
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for {
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select {
|
|
case <-ctx.Done():
|
|
return
|
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case err := <-headerSubscription.Err():
|
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ethConnectionErrors.WithLabelValues(e.networkName, "header_subscription_error").Inc()
|
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errC <- fmt.Errorf("error while processing header subscription: %w", err)
|
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p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
|
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return
|
|
case ev := <-headSink:
|
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if ev == nil {
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logger.Error("new header event is nil", zap.String("eth_network", e.networkName))
|
|
continue
|
|
}
|
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|
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start := time.Now()
|
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currentHash := ev.Hash()
|
|
logger.Info("processing new header",
|
|
zap.Stringer("current_block", ev.Number),
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zap.Stringer("current_blockhash", currentHash),
|
|
zap.String("eth_network", e.networkName))
|
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currentEthHeight.WithLabelValues(e.networkName).Set(float64(ev.Number.Int64()))
|
|
readiness.SetReady(e.readiness)
|
|
p2p.DefaultRegistry.SetNetworkStats(e.chainID, &gossipv1.Heartbeat_Network{
|
|
Height: ev.Number.Int64(),
|
|
ContractAddress: e.contract.Hex(),
|
|
})
|
|
|
|
e.pendingMu.Lock()
|
|
|
|
blockNumberU := ev.Number.Uint64()
|
|
atomic.StoreUint64(¤tBlockNumber, blockNumberU)
|
|
|
|
for key, pLock := range e.pending {
|
|
expectedConfirmations := uint64(pLock.message.ConsistencyLevel)
|
|
if expectedConfirmations < e.minConfirmations {
|
|
expectedConfirmations = e.minConfirmations
|
|
}
|
|
|
|
// Transaction was dropped and never picked up again
|
|
if pLock.height+4*uint64(expectedConfirmations) <= blockNumberU {
|
|
logger.Info("observation timed out",
|
|
zap.Stringer("tx", pLock.message.TxHash),
|
|
zap.Stringer("blockhash", key.BlockHash),
|
|
zap.Stringer("emitter_address", key.EmitterAddress),
|
|
zap.Uint64("sequence", key.Sequence),
|
|
zap.Stringer("current_block", ev.Number),
|
|
zap.Stringer("current_blockhash", currentHash),
|
|
zap.String("eth_network", e.networkName),
|
|
)
|
|
ethMessagesOrphaned.WithLabelValues(e.networkName, "timeout").Inc()
|
|
delete(e.pending, key)
|
|
continue
|
|
}
|
|
|
|
// Transaction is now ready
|
|
if pLock.height+uint64(expectedConfirmations) <= blockNumberU {
|
|
timeout, cancel := context.WithTimeout(ctx, 5*time.Second)
|
|
tx, err := e.ethIntf.TransactionReceipt(timeout, pLock.message.TxHash)
|
|
cancel()
|
|
|
|
// This should never happen - if we got this far, it means that logs were emitted,
|
|
// which is only possible if the transaction succeeded. We check it anyway just
|
|
// in case the EVM implementation is buggy.
|
|
if tx.Status != 1 {
|
|
logger.Error("transaction receipt with non-success status",
|
|
zap.Stringer("tx", pLock.message.TxHash),
|
|
zap.Stringer("blockhash", key.BlockHash),
|
|
zap.Stringer("emitter_address", key.EmitterAddress),
|
|
zap.Uint64("sequence", key.Sequence),
|
|
zap.Stringer("current_block", ev.Number),
|
|
zap.Stringer("current_blockhash", currentHash),
|
|
zap.String("eth_network", e.networkName),
|
|
zap.Error(err))
|
|
delete(e.pending, key)
|
|
ethMessagesOrphaned.WithLabelValues(e.networkName, "tx_failed").Inc()
|
|
continue
|
|
}
|
|
|
|
// If the node returns an error after waiting expectedConfirmation blocks,
|
|
// it means the chain reorged and the transaction was orphaned. The
|
|
// TransactionReceipt call is using the same websocket connection than the
|
|
// head notifications, so it's guaranteed to be atomic.
|
|
//
|
|
// Check multiple possible error cases - the node seems to return a
|
|
// "not found" error most of the time, but it could conceivably also
|
|
// return a nil tx or rpc.ErrNoResult.
|
|
if tx == nil || err == rpc.ErrNoResult || (err != nil && err.Error() == "not found") {
|
|
logger.Warn("tx was orphaned",
|
|
zap.Stringer("tx", pLock.message.TxHash),
|
|
zap.Stringer("blockhash", key.BlockHash),
|
|
zap.Stringer("emitter_address", key.EmitterAddress),
|
|
zap.Uint64("sequence", key.Sequence),
|
|
zap.Stringer("current_block", ev.Number),
|
|
zap.Stringer("current_blockhash", currentHash),
|
|
zap.String("eth_network", e.networkName),
|
|
zap.Error(err))
|
|
delete(e.pending, key)
|
|
ethMessagesOrphaned.WithLabelValues(e.networkName, "not_found").Inc()
|
|
continue
|
|
}
|
|
|
|
// Any error other than "not found" is likely transient - we retry next block.
|
|
if err != nil {
|
|
logger.Warn("transaction could not be fetched",
|
|
zap.Stringer("tx", pLock.message.TxHash),
|
|
zap.Stringer("blockhash", key.BlockHash),
|
|
zap.Stringer("emitter_address", key.EmitterAddress),
|
|
zap.Uint64("sequence", key.Sequence),
|
|
zap.Stringer("current_block", ev.Number),
|
|
zap.Stringer("current_blockhash", currentHash),
|
|
zap.String("eth_network", e.networkName),
|
|
zap.Error(err))
|
|
continue
|
|
}
|
|
|
|
// It's possible for a transaction to be orphaned and then included in a different block
|
|
// but with the same tx hash. Drop the observation (it will be re-observed and needs to
|
|
// wait for the full confirmation time again).
|
|
if tx.BlockHash != key.BlockHash {
|
|
logger.Info("tx got dropped and mined in a different block; the message should have been reobserved",
|
|
zap.Stringer("tx", pLock.message.TxHash),
|
|
zap.Stringer("blockhash", key.BlockHash),
|
|
zap.Stringer("emitter_address", key.EmitterAddress),
|
|
zap.Uint64("sequence", key.Sequence),
|
|
zap.Stringer("current_block", ev.Number),
|
|
zap.Stringer("current_blockhash", currentHash),
|
|
zap.String("eth_network", e.networkName))
|
|
delete(e.pending, key)
|
|
ethMessagesOrphaned.WithLabelValues(e.networkName, "blockhash_mismatch").Inc()
|
|
continue
|
|
}
|
|
|
|
logger.Info("observation confirmed",
|
|
zap.Stringer("tx", pLock.message.TxHash),
|
|
zap.Stringer("blockhash", key.BlockHash),
|
|
zap.Stringer("emitter_address", key.EmitterAddress),
|
|
zap.Uint64("sequence", key.Sequence),
|
|
zap.Stringer("current_block", ev.Number),
|
|
zap.Stringer("current_blockhash", currentHash),
|
|
zap.String("eth_network", e.networkName))
|
|
delete(e.pending, key)
|
|
e.msgChan <- pLock.message
|
|
ethMessagesConfirmed.WithLabelValues(e.networkName).Inc()
|
|
}
|
|
}
|
|
|
|
e.pendingMu.Unlock()
|
|
logger.Info("processed new header",
|
|
zap.Stringer("current_block", ev.Number),
|
|
zap.Stringer("current_blockhash", currentHash),
|
|
zap.Duration("took", time.Since(start)),
|
|
zap.String("eth_network", e.networkName))
|
|
}
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
case err := <-errC:
|
|
return err
|
|
}
|
|
}
|
|
|
|
func (e *Watcher) fetchAndUpdateGuardianSet(
|
|
logger *zap.Logger,
|
|
ctx context.Context,
|
|
ethIntf common.Ethish,
|
|
) error {
|
|
msm := time.Now()
|
|
logger.Info("fetching guardian set")
|
|
timeout, cancel := context.WithTimeout(ctx, 15*time.Second)
|
|
defer cancel()
|
|
idx, gs, err := fetchCurrentGuardianSet(timeout, ethIntf)
|
|
if err != nil {
|
|
ethConnectionErrors.WithLabelValues(e.networkName, "guardian_set_fetch_error").Inc()
|
|
p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
|
|
return err
|
|
}
|
|
|
|
queryLatency.WithLabelValues(e.networkName, "get_guardian_set").Observe(time.Since(msm).Seconds())
|
|
|
|
if e.currentGuardianSet != nil && *(e.currentGuardianSet) == idx {
|
|
return nil
|
|
}
|
|
|
|
logger.Info("updated guardian set found",
|
|
zap.Any("value", gs), zap.Uint32("index", idx),
|
|
zap.String("eth_network", e.networkName))
|
|
|
|
e.currentGuardianSet = &idx
|
|
|
|
if e.setChan != nil {
|
|
e.setChan <- &common.GuardianSet{
|
|
Keys: gs.Keys,
|
|
Index: idx,
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Fetch the current guardian set ID and guardian set from the chain.
|
|
func fetchCurrentGuardianSet(ctx context.Context, ethIntf common.Ethish) (uint32, *abi.StructsGuardianSet, error) {
|
|
currentIndex, err := ethIntf.GetCurrentGuardianSetIndex(ctx)
|
|
if err != nil {
|
|
return 0, nil, fmt.Errorf("error requesting current guardian set index: %w", err)
|
|
}
|
|
|
|
gs, err := ethIntf.GetGuardianSet(ctx, currentIndex)
|
|
if err != nil {
|
|
return 0, nil, fmt.Errorf("error requesting current guardian set value: %w", err)
|
|
}
|
|
|
|
return currentIndex, &gs, nil
|
|
}
|
|
|
|
func (e *Watcher) checkForSafeMode(ctx context.Context) error {
|
|
if e.chainID == vaa.ChainIDKarura || e.chainID == vaa.ChainIDAcala {
|
|
c, err := rpc.DialContext(ctx, e.url)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to connect to url %s to check for safe mode: %w", e.url, err)
|
|
}
|
|
|
|
var safe bool
|
|
err = c.CallContext(ctx, &safe, "net_isSafeMode")
|
|
if err != nil {
|
|
return fmt.Errorf("check for safe mode for url %s failed: %w", e.url, err)
|
|
}
|
|
|
|
if !safe {
|
|
return fmt.Errorf("url %s is not using safe mode", e.url)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|