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dialer.go
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dialer.go
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package main
import (
"context"
"fmt"
"flag"
"os"
"log"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p-core/peer"
circuit "github.com/libp2p/go-libp2p-circuit"
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")
recipient := flag.String("recipient", "", "Recipient Peer ID")
flag.Parse()
if *relayHost == "" {
log.Fatal("Please provide relay host with --relay option")
os.Exit(0)
}
if *recipient == "" {
log.Fatal("Please provide recipient with --recipient option")
os.Exit(0)
}
// Tell the host to discover peer through relay.
node, err := libp2p.New(context.Background(), libp2p.EnableRelay(circuit.OptDiscovery))
if err != nil {
panic(err)
}
// Creates relay peer.AddrInfo
relayAddrInfo, err := p2pAddrInfo(*relayHost)
if err != nil {
panic(err)
}
// Connect node to relay
if err := node.Connect(context.Background(), *relayAddrInfo); err != nil {
fmt.Println("fail connect to relay!")
panic(err)
}
recipientPeerid, err := peer.IDB58Decode(*recipient)
if err != nil {
panic(err)
}
// SwapToP2pMultiaddrs is a function to make the transition from /ipfs/... multiaddrs to /p2p/... multiaddrs easier The first stage of the rollout is to ship this package to all users so that all users of multiaddr can parse both /ipfs/ and /p2p/ multiaddrs as the same code (P_P2P).
ma.SwapToP2pMultiaddrs()
relayaddr, err := ma.NewMultiaddr(*relayHost + "/p2p-circuit/p2p/" + recipientPeerid.Pretty())
if err != nil {
panic(err)
}
recipientRelayInfo := peer.AddrInfo{
ID: recipientPeerid,
Addrs: []ma.Multiaddr{relayaddr},
}
// Connect node to recipient using relay
if err := node.Connect(context.Background(), recipientRelayInfo); err != nil {
fmt.Println("fail connect to recipient")
panic(err)
}
// Woohoo! we're connected!
s, err := node.NewStream(context.Background(), recipientPeerid, "/cats")
if err != nil {
fmt.Println("huh, this should have worked: ", err)
return
}
s.Read(make([]byte, 1)) // block until the handler closes the stream
fmt.Println("end")
}