78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
package guardiand
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import (
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"context"
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"encoding/hex"
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"time"
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"github.com/benbjohnson/clock"
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gossipv1 "github.com/certusone/wormhole/node/pkg/proto/gossip/v1"
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"github.com/wormhole-foundation/wormhole/sdk/vaa"
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"go.uber.org/zap"
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)
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// Multiplex observation requests to the appropriate chain
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func handleReobservationRequests(
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ctx context.Context,
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clock clock.Clock,
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logger *zap.Logger,
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obsvReqC <-chan *gossipv1.ObservationRequest,
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chainObsvReqC map[vaa.ChainID]chan *gossipv1.ObservationRequest,
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) {
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// Due to the automatic re-observation requests sent out by the processor we may end
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// up getting multiple requests to re-observe the same tx. Keep a cache of the
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// requests received in the last 11 minutes so that we don't end up repeatedly
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// re-observing the same transactions.
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type cachedRequest struct {
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chainId vaa.ChainID
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txHash string
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}
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cache := make(map[cachedRequest]time.Time)
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ticker := clock.Ticker(7 * time.Minute)
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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 <-ticker.C:
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now := clock.Now()
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for r, t := range cache {
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if now.Sub(t) > 11*time.Minute {
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delete(cache, r)
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}
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}
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case req := <-obsvReqC:
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r := cachedRequest{
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chainId: vaa.ChainID(req.ChainId),
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txHash: hex.EncodeToString(req.TxHash),
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}
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if _, ok := cache[r]; ok {
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// We've recently seen a re-observation request for this tx
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// so skip this one.
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logger.Info("skipping duplicate re-observation request",
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zap.Stringer("chain", r.chainId),
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zap.String("tx_hash", r.txHash),
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)
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continue
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}
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if channel, ok := chainObsvReqC[r.chainId]; ok {
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select {
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case channel <- req:
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cache[r] = clock.Now()
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default:
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logger.Warn("failed to send reobservation request to watcher",
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zap.Stringer("chain_id", r.chainId),
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zap.String("tx_hash", r.txHash))
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}
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} else {
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logger.Error("unknown chain ID for reobservation request",
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zap.Uint16("chain_id", uint16(r.chainId)),
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zap.String("tx_hash", r.txHash))
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}
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}
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}
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}
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