mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-22 19:40:36 +00:00
d96870428f
This PR implements the first one of the "lespay" UDP queries which is already useful in itself: the capacity query. The server pool is making use of this query by doing a cheap UDP query to determine whether it is worth starting the more expensive TCP connection process.
74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
// Copyright 2019 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package les
|
|
|
|
import (
|
|
"github.com/ethereum/go-ethereum/core/forkid"
|
|
"github.com/ethereum/go-ethereum/p2p"
|
|
"github.com/ethereum/go-ethereum/p2p/dnsdisc"
|
|
"github.com/ethereum/go-ethereum/p2p/enode"
|
|
"github.com/ethereum/go-ethereum/rlp"
|
|
)
|
|
|
|
// lesEntry is the "les" ENR entry. This is set for LES servers only.
|
|
type lesEntry struct {
|
|
// Ignore additional fields (for forward compatibility).
|
|
VfxVersion uint
|
|
Rest []rlp.RawValue `rlp:"tail"`
|
|
}
|
|
|
|
func (lesEntry) ENRKey() string { return "les" }
|
|
|
|
// ethEntry is the "eth" ENR entry. This is redeclared here to avoid depending on package eth.
|
|
type ethEntry struct {
|
|
ForkID forkid.ID
|
|
_ []rlp.RawValue `rlp:"tail"`
|
|
}
|
|
|
|
func (ethEntry) ENRKey() string { return "eth" }
|
|
|
|
// setupDiscovery creates the node discovery source for the eth protocol.
|
|
func (eth *LightEthereum) setupDiscovery(cfg *p2p.Config) (enode.Iterator, error) {
|
|
it := enode.NewFairMix(0)
|
|
|
|
// Enable DNS discovery.
|
|
if len(eth.config.EthDiscoveryURLs) != 0 {
|
|
client := dnsdisc.NewClient(dnsdisc.Config{})
|
|
dns, err := client.NewIterator(eth.config.EthDiscoveryURLs...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
it.AddSource(dns)
|
|
}
|
|
|
|
// Enable DHT.
|
|
if cfg.DiscoveryV5 && eth.p2pServer.DiscV5 != nil {
|
|
it.AddSource(eth.p2pServer.DiscV5.RandomNodes())
|
|
}
|
|
|
|
forkFilter := forkid.NewFilter(eth.blockchain)
|
|
iterator := enode.Filter(it, func(n *enode.Node) bool { return nodeIsServer(forkFilter, n) })
|
|
return iterator, nil
|
|
}
|
|
|
|
// nodeIsServer checks whether n is an LES server node.
|
|
func nodeIsServer(forkFilter forkid.Filter, n *enode.Node) bool {
|
|
var les lesEntry
|
|
var eth ethEntry
|
|
return n.Load(&les) == nil && n.Load(ð) == nil && forkFilter(eth.ForkID) == nil
|
|
}
|