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listener.go
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/
listener.go
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package main
import (
"context"
"fmt"
"flag"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
ma "github.com/multiformats/go-multiaddr"
)
// create peer addr info
func p2pAddrInfo(addrStr string) (*peer.AddrInfo, error) {
addr, err := ma.NewMultiaddr(addrStr)
if err != nil {
panic(err)
}
return peer.AddrInfoFromP2pAddr(addr)
}
func main() {
relayHost := flag.String("relay", "", "Relay Host URL")
flag.Parse()
// Zero out the listen addresses for the host, so it can only communicate
// via p2p-circuit for our example
node, err := libp2p.New(
context.Background(),
libp2p.ListenAddrs(),
libp2p.EnableRelay(),
)
if err != nil {
panic(err)
}
// Creates relay peer.AddrInfo
relayAddrInfo, err := p2pAddrInfo(*relayHost)
if err != nil {
panic(err)
}
if err := node.Connect(context.Background(), *relayAddrInfo); err != nil {
panic(err)
}
// Now, to test things, let's set up a protocol handler on node
node.SetStreamHandler("/cats", func(s network.Stream) {
fmt.Println("Meow! It worked!")
s.Close()
})
fmt.Println("Bob Relay ID:", node.ID().Pretty());
for _, addr := range node.Addrs() {
fmt.Printf("Bob Relay Addr: %s\n", addr.String())
}
select {}
}