mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
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86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
package dht
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import (
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"context"
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"fmt"
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"time"
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"github.com/libp2p/go-libp2p-kad-dht/internal"
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"github.com/libp2p/go-libp2p-kad-dht/metrics"
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"github.com/libp2p/go-libp2p-kad-dht/qpeerset"
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kb "github.com/libp2p/go-libp2p-kbucket"
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"github.com/libp2p/go-libp2p/core/peer"
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"github.com/libp2p/go-libp2p/core/routing"
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"go.opentelemetry.io/otel/trace"
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)
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// GetClosestPeers is a Kademlia 'node lookup' operation. Returns a channel of
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// the K closest peers to the given key.
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//
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// If the context is canceled, this function will return the context error along
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// with the closest K peers it has found so far.
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func (dht *IpfsDHT) GetClosestPeers(ctx context.Context, key string) ([]peer.ID, error) {
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ctx, span := internal.StartSpan(ctx, "IpfsDHT.GetClosestPeers", trace.WithAttributes(internal.KeyAsAttribute("Key", key)))
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defer span.End()
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if key == "" {
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return nil, fmt.Errorf("can't lookup empty key")
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}
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//TODO: I can break the interface! return []peer.ID
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lookupRes, err := dht.runLookupWithFollowup(ctx, key, dht.pmGetClosestPeers(key), func(*qpeerset.QueryPeerset) bool { return false })
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if err != nil {
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return nil, err
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}
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if err := ctx.Err(); err != nil || !lookupRes.completed {
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return lookupRes.peers, err
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}
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// tracking lookup results for network size estimator
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if err = dht.nsEstimator.Track(key, lookupRes.closest); err != nil {
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logger.Warnf("network size estimator track peers: %s", err)
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}
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if ns, err := dht.nsEstimator.NetworkSize(); err == nil {
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metrics.NetworkSize.M(int64(ns))
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}
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// refresh the cpl for this key as the query was successful
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dht.routingTable.ResetCplRefreshedAtForID(kb.ConvertKey(key), time.Now())
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return lookupRes.peers, nil
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}
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// pmGetClosestPeers is the protocol messenger version of the GetClosestPeer queryFn.
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func (dht *IpfsDHT) pmGetClosestPeers(key string) queryFn {
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return func(ctx context.Context, p peer.ID) ([]*peer.AddrInfo, error) {
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// For DHT query command
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routing.PublishQueryEvent(ctx, &routing.QueryEvent{
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Type: routing.SendingQuery,
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ID: p,
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})
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peers, err := dht.protoMessenger.GetClosestPeers(ctx, p, peer.ID(key))
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if err != nil {
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logger.Debugf("error getting closer peers: %s", err)
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routing.PublishQueryEvent(ctx, &routing.QueryEvent{
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Type: routing.QueryError,
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ID: p,
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Extra: err.Error(),
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})
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return nil, err
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}
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// For DHT query command
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routing.PublishQueryEvent(ctx, &routing.QueryEvent{
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Type: routing.PeerResponse,
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ID: p,
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Responses: peers,
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})
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return peers, err
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}
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}
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