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multiaddr.go
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/
multiaddr.go
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package p2putil
import (
"context"
"errors"
"github.com/aergoio/aergo/v2/types"
"github.com/multiformats/go-multiaddr"
"github.com/multiformats/go-multiaddr-dns"
"math/rand"
)
// ResolveMultiAddress resolve address of dns name to ip address,
// It is needed to connect tcp stream since tcp protocol requires ip4 or ip6 after 2021
func ResolveMultiAddress(peerAddr types.Multiaddr) ([]multiaddr.Multiaddr, error) {
resolver, err2 := madns.NewResolver()
if err2 != nil {
return nil, errors.New("Failed to get dns resolver: " + err2.Error())
}
resolved, err2 := resolver.Resolve(context.Background(), peerAddr)
if err2 != nil {
return nil, errors.New("Failed to resolve peer address: " + err2.Error())
}
return resolved, nil
}
// ResolveToBestIp4Address resolve multi address and then choose one with ip4
func ResolveToBestIp4Address(peerAddr types.Multiaddr) (multiaddr.Multiaddr, error) {
addrs, err := ResolveMultiAddress(peerAddr)
if err != nil {
return nil, err
}
if len(addrs) == 0 {
return nil, errors.New("no valid ip addresses")
}
return addrs[rand.Intn(len(addrs))], nil
}