/
discovery.go
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/
discovery.go
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// Copyright 2019 The go-binacoin Authors
// This file is part of the go-binacoin library.
//
// The go-binacoin 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-binacoin 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-binacoin library. If not, see <http://www.gnu.org/licenses/>.
package bna
import (
"github.com/binacoin-official/go-binacoin/core"
"github.com/binacoin-official/go-binacoin/core/forkid"
"github.com/binacoin-official/go-binacoin/p2p/enode"
"github.com/binacoin-official/go-binacoin/rlp"
)
// bnaEntry is the "bna" ENR entry which advertises bna protocol
// on the discovery network.
type bnaEntry struct {
ForkID forkid.ID // Fork identifier per EIP-2124
// Ignore additional fields (for forward compatibility).
Rest []rlp.RawValue `rlp:"tail"`
}
// ENRKey implements enr.Entry.
func (e bnaEntry) ENRKey() string {
return "bna"
}
// startBnaEntryUpdate starts the ENR updater loop.
func (bna *Binacoin) startBnaEntryUpdate(ln *enode.LocalNode) {
var newHead = make(chan core.ChainHeadEvent, 10)
sub := bna.blockchain.SubscribeChainHeadEvent(newHead)
go func() {
defer sub.Unsubscribe()
for {
select {
case <-newHead:
ln.Set(bna.currentBnaEntry())
case <-sub.Err():
// Would be nice to sync with bna.Stop, but there is no
// good way to do that.
return
}
}
}()
}
func (bna *Binacoin) currentBnaEntry() *bnaEntry {
return &bnaEntry{ForkID: forkid.NewID(bna.blockchain.Config(), bna.blockchain.Genesis().Hash(),
bna.blockchain.CurrentHeader().Number.Uint64())}
}