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// Copyright 2016 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 discv5
import (
"encoding/binary"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/mclock"
)
func TestTopicRadius(t *testing.T) {
now := mclock.Now()
topic := Topic("qwerty")
rad := newTopicRadius(topic)
targetRad := (^uint64(0)) / 100
waitFn := func(addr common.Hash) time.Duration {
prefix := binary.BigEndian.Uint64(addr[0:8])
dist := prefix ^ rad.topicHashPrefix
relDist := float64(dist) / float64(targetRad)
relTime := (1 - relDist/2) * 2
if relTime < 0 {
relTime = 0
}
return time.Duration(float64(targetWaitTime) * relTime)
}
bcnt := 0
cnt := 0
var sum float64
for cnt < 100 {
addr := rad.nextTarget(false).target
wait := waitFn(addr)
ticket := &ticket{
topics: []Topic{topic},
regTime: []mclock.AbsTime{mclock.AbsTime(wait)},
node: &Node{nodeNetGuts: nodeNetGuts{sha: addr}},
}
rad.adjustWithTicket(now, addr, ticketRef{ticket, 0})
if rad.radius != maxRadius {
cnt++
sum += float64(rad.radius)
} else {
bcnt++
if bcnt > 500 {
t.Errorf("Radius did not converge in 500 iterations")
}
}
}
avgRel := sum / float64(cnt) / float64(targetRad)
if avgRel > 1.05 || avgRel < 0.95 {
t.Errorf("Average/target ratio is too far from 1 (%v)", avgRel)
}
}
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