/
addr.go
67 lines (55 loc) · 2.1 KB
/
addr.go
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// Copyright (c) 2018 ContentBox Authors.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package p2p
import (
"fmt"
host "github.com/libp2p/go-libp2p-host"
peer "github.com/libp2p/go-libp2p-peer"
ma "github.com/multiformats/go-multiaddr"
)
// init function
func init() {
ma.SwapToP2pMultiaddrs() // change ma.P_P2P from 'ipfs' to 'p2p'
}
// PeerMultiAddr returns the full p2p multiaddr of specified host.
// e.g. /ip4/192.168.10.34/tcp/19199/p2p/12D3KooWLornEge5BiVbL92o8wdFivY4c7GV3QdfmjkFk7Vm48Uk
func PeerMultiAddr(h host.Host) (ma.Multiaddr, error) {
// Build host multiaddress
hostAddr, err := ma.NewMultiaddr(fmt.Sprintf("/%s/%s", ma.ProtocolWithCode(ma.P_P2P).Name, h.ID().Pretty()))
if err != nil {
return nil, err
}
// full multiaddress to reach this host
return h.Addrs()[0].Encapsulate(hostAddr), nil
}
// DecapsulatePeerMultiAddr decapsulates a p2p multiaddr into host multiaddr and peer id
// e.g. /ip4/192.168.10.34/tcp/19199/p2p/12D3KooWLornEge5BiVbL92o8wdFivY4c7GV3QdfmjkFk7Vm48Uk
// decapsuated to /ip4/192.168.10.34/tcp/19199, 12D3KooWLornEge5BiVbL92o8wdFivY4c7GV3QdfmjkFk7Vm48Uk
func DecapsulatePeerMultiAddr(addr ma.Multiaddr) (ma.Multiaddr, peer.ID, error) {
pid, err := addr.ValueForProtocol(ma.P_P2P)
if err != nil {
return nil, "", err
}
peerid, err := peer.IDB58Decode(pid)
if err != nil {
return nil, "", err
}
pma, _ := ma.NewMultiaddr(
fmt.Sprintf("/%s/%s", ma.ProtocolWithCode(ma.P_P2P).Name, pid),
)
lma := addr.Decapsulate(pma)
return lma, peerid, nil
}
// EncapsulatePeerMultiAddr encapsulates a host multiaddr and peer id into p2p multiaddr
// e.g. /ip4/192.168.10.34/tcp/19199 and 12D3KooWLornEge5BiVbL92o8wdFivY4c7GV3QdfmjkFk7Vm48Uk
// encapsuated to /ip4/192.168.10.34/tcp/19199/p2p/12D3KooWLornEge5BiVbL92o8wdFivY4c7GV3QdfmjkFk7Vm48Uk
func EncapsulatePeerMultiAddr(addr ma.Multiaddr, peerid peer.ID) (ma.Multiaddr, error) {
pma, err := ma.NewMultiaddr(
fmt.Sprintf("/%s/%s", ma.ProtocolWithCode(ma.P_P2P).Name, peer.IDB58Encode(peerid)),
)
if err != nil {
return nil, err
}
return addr.Encapsulate(pma), nil
}