mirror of https://github.com/status-im/go-waku.git
45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
package utils
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import (
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"errors"
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logging "github.com/ipfs/go-log"
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"github.com/libp2p/go-libp2p-core/host"
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"github.com/libp2p/go-libp2p-core/peer"
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)
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var log = logging.Logger("utils")
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// SelectPeer is used to return a peer that supports a given protocol.
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// It currently selects the first peer returned by the peerstore
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func SelectPeer(host host.Host, protocolId string) (*peer.ID, error) {
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// @TODO We need to be more strategic about which peers we dial. Right now we just set one on the service.
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// Ideally depending on the query and our set of peers we take a subset of ideal peers.
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// This will require us to check for various factors such as:
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// - which topics they track
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// - latency?
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// - default store peer?
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// Selects the best peer for a given protocol
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var peers peer.IDSlice
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for _, peer := range host.Peerstore().Peers() {
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protocols, err := host.Peerstore().SupportsProtocols(peer, protocolId)
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if err != nil {
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log.Error("error obtaining the protocols supported by peers", err)
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return nil, err
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}
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if len(protocols) > 0 {
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peers = append(peers, peer)
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}
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}
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if len(peers) >= 1 {
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// TODO: proper heuristic here that compares peer scores and selects "best" one. For now the first peer for the given protocol is returned
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return &peers[0], nil
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}
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return nil, errors.New("no suitable peers found")
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}
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