mirror of https://github.com/status-im/go-waku.git
66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
package discovery
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import (
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"context"
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"fmt"
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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/libp2p/go-libp2p-core/peer"
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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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// WithMultiaddress is a WakuNodeOption that configures libp2p to listen on a list of multiaddresses
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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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// RetrieveNodes returns a list of multiaddress given a url to a DNS discoverable
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// ENR tree
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func RetrieveNodes(ctx context.Context, url string, opts ...DnsDiscoveryOption) ([]ma.Multiaddr, error) {
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var multiAddrs []ma.Multiaddr
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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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m, err := EnodeToMultiAddr(node)
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if err != nil {
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return nil, err
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}
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multiAddrs = append(multiAddrs, m)
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}
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return multiAddrs, nil
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}
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func EnodeToMultiAddr(node *enode.Node) (ma.Multiaddr, error) {
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peerID, err := peer.IDFromPublicKey(&ECDSAPublicKey{node.Pubkey()})
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if err != nil {
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return nil, err
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}
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return ma.NewMultiaddr(fmt.Sprintf("/ip4/%s/tcp/%d/p2p/%s", node.IP(), node.TCP(), peerID))
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}
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