github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/p2p/discv5/topic_test.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package discv5
    19  
    20  import (
    21  	"encoding/binary"
    22  	"testing"
    23  	"time"
    24  
    25  	"github.com/AigarNetwork/aigar/common"
    26  	"github.com/AigarNetwork/aigar/common/mclock"
    27  )
    28  
    29  func TestTopicRadius(t *testing.T) {
    30  	now := mclock.Now()
    31  	topic := Topic("qwerty")
    32  	rad := newTopicRadius(topic)
    33  	targetRad := (^uint64(0)) / 100
    34  
    35  	waitFn := func(addr common.Hash) time.Duration {
    36  		prefix := binary.BigEndian.Uint64(addr[0:8])
    37  		dist := prefix ^ rad.topicHashPrefix
    38  		relDist := float64(dist) / float64(targetRad)
    39  		relTime := (1 - relDist/2) * 2
    40  		if relTime < 0 {
    41  			relTime = 0
    42  		}
    43  		return time.Duration(float64(targetWaitTime) * relTime)
    44  	}
    45  
    46  	bcnt := 0
    47  	cnt := 0
    48  	var sum float64
    49  	for cnt < 100 {
    50  		addr := rad.nextTarget(false).target
    51  		wait := waitFn(addr)
    52  		ticket := &ticket{
    53  			topics:  []Topic{topic},
    54  			regTime: []mclock.AbsTime{mclock.AbsTime(wait)},
    55  			node:    &Node{nodeNetGuts: nodeNetGuts{sha: addr}},
    56  		}
    57  		rad.adjustWithTicket(now, addr, ticketRef{ticket, 0})
    58  		if rad.radius != maxRadius {
    59  			cnt++
    60  			sum += float64(rad.radius)
    61  		} else {
    62  			bcnt++
    63  			if bcnt > 500 {
    64  				t.Errorf("Radius did not converge in 500 iterations")
    65  			}
    66  		}
    67  	}
    68  	avgRel := sum / float64(cnt) / float64(targetRad)
    69  	if avgRel > 1.05 || avgRel < 0.95 {
    70  		t.Errorf("Average/target ratio is too far from 1 (%v)", avgRel)
    71  	}
    72  }