github.com/snowblossomcoin/go-ethereum@v1.9.25/les/enr_entry.go (about) 1 // Copyright 2019 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 package les 18 19 import ( 20 "github.com/ethereum/go-ethereum/p2p" 21 "github.com/ethereum/go-ethereum/p2p/dnsdisc" 22 "github.com/ethereum/go-ethereum/p2p/enode" 23 "github.com/ethereum/go-ethereum/rlp" 24 ) 25 26 // lesEntry is the "les" ENR entry. This is set for LES servers only. 27 type lesEntry struct { 28 // Ignore additional fields (for forward compatibility). 29 Rest []rlp.RawValue `rlp:"tail"` 30 } 31 32 // ENRKey implements enr.Entry. 33 func (e lesEntry) ENRKey() string { 34 return "les" 35 } 36 37 // setupDiscovery creates the node discovery source for the eth protocol. 38 func (eth *LightEthereum) setupDiscovery(cfg *p2p.Config) (enode.Iterator, error) { 39 if cfg.NoDiscovery || len(eth.config.DiscoveryURLs) == 0 { 40 return nil, nil 41 } 42 client := dnsdisc.NewClient(dnsdisc.Config{}) 43 return client.NewIterator(eth.config.DiscoveryURLs...) 44 }