72 lines
2.0 KiB
Go
72 lines
2.0 KiB
Go
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// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package discv5
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import (
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"encoding/binary"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/mclock"
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)
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func TestTopicRadius(t *testing.T) {
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now := mclock.Now()
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topic := Topic("qwerty")
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rad := newTopicRadius(topic)
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targetRad := (^uint64(0)) / 100
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waitFn := func(addr common.Hash) time.Duration {
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prefix := binary.BigEndian.Uint64(addr[0:8])
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dist := prefix ^ rad.topicHashPrefix
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relDist := float64(dist) / float64(targetRad)
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relTime := (1 - relDist/2) * 2
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if relTime < 0 {
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relTime = 0
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}
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return time.Duration(float64(targetWaitTime) * relTime)
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}
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bcnt := 0
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cnt := 0
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var sum float64
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for cnt < 100 {
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addr := rad.nextTarget(false).target
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wait := waitFn(addr)
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ticket := &ticket{
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topics: []Topic{topic},
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regTime: []mclock.AbsTime{mclock.AbsTime(wait)},
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node: &Node{nodeNetGuts: nodeNetGuts{sha: addr}},
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}
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rad.adjustWithTicket(now, addr, ticketRef{ticket, 0})
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if rad.radius != maxRadius {
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cnt++
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sum += float64(rad.radius)
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} else {
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bcnt++
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if bcnt > 500 {
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t.Errorf("Radius did not converge in 500 iterations")
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}
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}
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}
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avgRel := sum / float64(cnt) / float64(targetRad)
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if avgRel > 1.05 || avgRel < 0.95 {
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t.Errorf("Average/target ratio is too far from 1 (%v)", avgRel)
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}
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}
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