mirror of https://github.com/status-im/go-waku.git
80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
package dnsdisc
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import (
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"context"
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"github.com/ethereum/go-ethereum/p2p/dnsdisc"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/enr"
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"github.com/libp2p/go-libp2p/core/peer"
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"github.com/waku-org/go-waku/waku/v2/utils"
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ma "github.com/multiformats/go-multiaddr"
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)
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type dnsDiscoveryParameters struct {
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nameserver string
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}
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type DnsDiscoveryOption func(*dnsDiscoveryParameters)
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// WithNameserver is a DnsDiscoveryOption that configures the nameserver to use
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func WithNameserver(nameserver string) DnsDiscoveryOption {
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return func(params *dnsDiscoveryParameters) {
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params.nameserver = nameserver
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}
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}
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type DiscoveredNode struct {
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PeerID peer.ID
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Addresses []ma.Multiaddr
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ENR *enode.Node
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}
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// RetrieveNodes returns a list of multiaddress given a url to a DNS discoverable ENR tree
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func RetrieveNodes(ctx context.Context, url string, opts ...DnsDiscoveryOption) ([]DiscoveredNode, error) {
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var discoveredNodes []DiscoveredNode
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params := new(dnsDiscoveryParameters)
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for _, opt := range opts {
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opt(params)
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}
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client := dnsdisc.NewClient(dnsdisc.Config{
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Resolver: GetResolver(ctx, params.nameserver),
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})
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tree, err := client.SyncTree(url)
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if err != nil {
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return nil, err
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}
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for _, node := range tree.Nodes() {
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peerID, m, err := utils.Multiaddress(node)
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if err != nil {
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return nil, err
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}
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d := DiscoveredNode{
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PeerID: peerID,
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Addresses: m,
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}
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if hasUDP(node) {
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d.ENR = node
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}
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discoveredNodes = append(discoveredNodes, d)
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}
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return discoveredNodes, nil
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}
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func hasUDP(node *enode.Node) bool {
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enrUDP := new(enr.UDP)
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if err := node.Record().Load(enr.WithEntry(enrUDP.ENRKey(), enrUDP)); err != nil {
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return false
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}
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return true
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}
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