mirror of https://github.com/status-im/go-waku.git
44 lines
896 B
Go
44 lines
896 B
Go
package discovery
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import (
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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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)
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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(url string) ([]string, error) {
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var multiAddrs []string
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client := dnsdisc.NewClient(dnsdisc.Config{})
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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) (string, error) {
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peerID, err := peer.IDFromPublicKey(&ECDSAPublicKey{node.Pubkey()})
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("/ip4/%s/tcp/%d/p2p/%s", node.IP(), node.TCP(), peerID), nil
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}
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