dendrite/cmd/dendrite-demo-libp2p/mdnslistener.go

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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"fmt"
"math"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/matrix-org/gomatrixserverlib"
)
type mDNSListener struct {
keydb gomatrixserverlib.KeyDatabase
host host.Host
}
func (n *mDNSListener) HandlePeerFound(p peer.AddrInfo) {
if err := n.host.Connect(context.Background(), p); err != nil {
fmt.Println("Error adding peer", p.ID.String(), "via mDNS:", err)
}
if pubkey, err := p.ID.ExtractPublicKey(); err == nil {
raw, _ := pubkey.Raw()
if err := n.keydb.StoreKeys(
context.Background(),
map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult{
{
ServerName: gomatrixserverlib.ServerName(p.ID.String()),
KeyID: "ed25519:p2pdemo",
}: {
VerifyKey: gomatrixserverlib.VerifyKey{
Key: gomatrixserverlib.Base64Bytes(raw),
},
ValidUntilTS: math.MaxUint64 >> 1,
ExpiredTS: gomatrixserverlib.PublicKeyNotExpired,
},
},
); err != nil {
fmt.Println("Failed to store keys:", err)
}
}
fmt.Println("Discovered", len(n.host.Peerstore().Peers())-1, "other libp2p peer(s):")
for _, peer := range n.host.Peerstore().Peers() {
if peer != n.host.ID() {
fmt.Println("-", peer)
}
}
}