github.com/core-coin/go-core/v2@v2.1.9/les/enr_entry.go (about)

     1  // Copyright 2019 by the Authors
     2  // This file is part of the go-core library.
     3  //
     4  // The go-core 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-core 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-core library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package les
    18  
    19  import (
    20  	"github.com/core-coin/go-core/v2/p2p/dnsdisc"
    21  	"github.com/core-coin/go-core/v2/p2p/enode"
    22  	"github.com/core-coin/go-core/v2/rlp"
    23  )
    24  
    25  // lesEntry is the "les" ENR entry. This is set for LES servers only.
    26  type lesEntry struct {
    27  	// Ignore additional fields (for forward compatibility).
    28  	Rest []rlp.RawValue `rlp:"tail"`
    29  }
    30  
    31  // ENRKey implements enr.Entry.
    32  func (e lesEntry) ENRKey() string {
    33  	return "les"
    34  }
    35  
    36  // setupDiscovery creates the node discovery source for the xcb protocol.
    37  func (xcb *LightCore) setupDiscovery() (enode.Iterator, error) {
    38  	if len(xcb.config.DiscoveryURLs) == 0 {
    39  		return nil, nil
    40  	}
    41  	client := dnsdisc.NewClient(dnsdisc.Config{})
    42  	return client.NewIterator(xcb.config.DiscoveryURLs...)
    43  }