467 lines
13 KiB
Go
467 lines
13 KiB
Go
// Copyright 2018 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 network
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import (
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"fmt"
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"os"
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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/log"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/protocols"
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"github.com/ethereum/go-ethereum/swarm/pot"
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)
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func init() {
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h := log.LvlFilterHandler(log.LvlWarn, log.StreamHandler(os.Stderr, log.TerminalFormat(true)))
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log.Root().SetHandler(h)
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}
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func testKadPeerAddr(s string) *BzzAddr {
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a := pot.NewAddressFromString(s)
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return &BzzAddr{OAddr: a, UAddr: a}
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}
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func newTestKademliaParams() *KadParams {
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params := NewKadParams()
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params.MinBinSize = 2
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params.NeighbourhoodSize = 2
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return params
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}
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type testKademlia struct {
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*Kademlia
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t *testing.T
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}
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func newTestKademlia(t *testing.T, b string) *testKademlia {
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base := pot.NewAddressFromString(b)
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return &testKademlia{
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Kademlia: NewKademlia(base, newTestKademliaParams()),
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t: t,
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}
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}
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func (tk *testKademlia) newTestKadPeer(s string, lightNode bool) *Peer {
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return NewPeer(&BzzPeer{BzzAddr: testKadPeerAddr(s), LightNode: lightNode}, tk.Kademlia)
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}
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func (tk *testKademlia) On(ons ...string) {
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for _, s := range ons {
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tk.Kademlia.On(tk.newTestKadPeer(s, false))
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}
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}
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func (tk *testKademlia) Off(offs ...string) {
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for _, s := range offs {
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tk.Kademlia.Off(tk.newTestKadPeer(s, false))
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}
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}
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func (tk *testKademlia) Register(regs ...string) {
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var as []*BzzAddr
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for _, s := range regs {
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as = append(as, testKadPeerAddr(s))
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}
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err := tk.Kademlia.Register(as...)
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if err != nil {
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panic(err.Error())
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}
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}
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// tests the validity of neighborhood depth calculations
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//
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// in particular, it tests that if there are one or more consecutive
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// empty bins above the farthest "nearest neighbor-peer" then
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// the depth should be set at the farthest of those empty bins
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//
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// TODO: Make test adapt to change in NeighbourhoodSize
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func TestNeighbourhoodDepth(t *testing.T) {
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baseAddressBytes := RandomAddr().OAddr
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kad := NewKademlia(baseAddressBytes, NewKadParams())
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baseAddress := pot.NewAddressFromBytes(baseAddressBytes)
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// generate the peers
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var peers []*Peer
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for i := 0; i < 7; i++ {
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addr := pot.RandomAddressAt(baseAddress, i)
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peers = append(peers, newTestDiscoveryPeer(addr, kad))
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}
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var sevenPeers []*Peer
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for i := 0; i < 2; i++ {
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addr := pot.RandomAddressAt(baseAddress, 7)
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sevenPeers = append(sevenPeers, newTestDiscoveryPeer(addr, kad))
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}
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testNum := 0
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// first try with empty kademlia
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depth := kad.NeighbourhoodDepth()
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if depth != 0 {
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t.Fatalf("%d expected depth 0, was %d", testNum, depth)
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}
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testNum++
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// add one peer on 7
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kad.On(sevenPeers[0])
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depth = kad.NeighbourhoodDepth()
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if depth != 0 {
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t.Fatalf("%d expected depth 0, was %d", testNum, depth)
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}
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testNum++
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// add a second on 7
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kad.On(sevenPeers[1])
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depth = kad.NeighbourhoodDepth()
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if depth != 0 {
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t.Fatalf("%d expected depth 0, was %d", testNum, depth)
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}
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testNum++
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// add from 0 to 6
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for i, p := range peers {
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kad.On(p)
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depth = kad.NeighbourhoodDepth()
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if depth != i+1 {
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t.Fatalf("%d.%d expected depth %d, was %d", i+1, testNum, i, depth)
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}
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}
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testNum++
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kad.Off(sevenPeers[1])
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depth = kad.NeighbourhoodDepth()
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if depth != 6 {
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t.Fatalf("%d expected depth 6, was %d", testNum, depth)
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}
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testNum++
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kad.Off(peers[4])
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depth = kad.NeighbourhoodDepth()
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if depth != 4 {
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t.Fatalf("%d expected depth 4, was %d", testNum, depth)
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}
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testNum++
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kad.Off(peers[3])
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depth = kad.NeighbourhoodDepth()
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if depth != 3 {
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t.Fatalf("%d expected depth 3, was %d", testNum, depth)
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}
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testNum++
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}
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// TestHealthStrict tests the simplest definition of health
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// Which means whether we are connected to all neighbors we know of
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func TestHealthStrict(t *testing.T) {
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// base address is all zeros
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// no peers
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// unhealthy (and lonely)
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tk := newTestKademlia(t, "11111111")
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tk.checkHealth(false, false)
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// know one peer but not connected
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// unhealthy
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tk.Register("11100000")
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tk.checkHealth(false, false)
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// know one peer and connected
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// healthy
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tk.On("11100000")
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tk.checkHealth(true, false)
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// know two peers, only one connected
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// unhealthy
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tk.Register("11111100")
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tk.checkHealth(false, false)
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// know two peers and connected to both
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// healthy
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tk.On("11111100")
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tk.checkHealth(true, false)
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// know three peers, connected to the two deepest
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// healthy
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tk.Register("00000000")
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tk.checkHealth(true, false)
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// know three peers, connected to all three
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// healthy
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tk.On("00000000")
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tk.checkHealth(true, false)
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// add fourth peer deeper than current depth
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// unhealthy
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tk.Register("11110000")
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tk.checkHealth(false, false)
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// connected to three deepest peers
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// healthy
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tk.On("11110000")
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tk.checkHealth(true, false)
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// add additional peer in same bin as deepest peer
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// unhealthy
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tk.Register("11111101")
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tk.checkHealth(false, false)
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// four deepest of five peers connected
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// healthy
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tk.On("11111101")
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tk.checkHealth(true, false)
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}
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func (tk *testKademlia) checkHealth(expectHealthy bool, expectSaturation bool) {
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tk.t.Helper()
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kid := common.Bytes2Hex(tk.BaseAddr())
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addrs := [][]byte{tk.BaseAddr()}
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tk.EachAddr(nil, 255, func(addr *BzzAddr, po int) bool {
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addrs = append(addrs, addr.Address())
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return true
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})
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pp := NewPeerPotMap(tk.NeighbourhoodSize, addrs)
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healthParams := tk.Healthy(pp[kid])
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// definition of health, all conditions but be true:
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// - we at least know one peer
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// - we know all neighbors
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// - we are connected to all known neighbors
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health := healthParams.KnowNN && healthParams.ConnectNN && healthParams.CountKnowNN > 0
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if expectHealthy != health {
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tk.t.Fatalf("expected kademlia health %v, is %v\n%v", expectHealthy, health, tk.String())
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}
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}
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func (tk *testKademlia) checkSuggestPeer(expAddr string, expDepth int, expChanged bool) {
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tk.t.Helper()
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addr, depth, changed := tk.SuggestPeer()
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log.Trace("suggestPeer return", "addr", addr, "depth", depth, "changed", changed)
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if binStr(addr) != expAddr {
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tk.t.Fatalf("incorrect peer address suggested. expected %v, got %v", expAddr, binStr(addr))
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}
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if depth != expDepth {
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tk.t.Fatalf("incorrect saturation depth suggested. expected %v, got %v", expDepth, depth)
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}
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if changed != expChanged {
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tk.t.Fatalf("expected depth change = %v, got %v", expChanged, changed)
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}
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}
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func binStr(a *BzzAddr) string {
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if a == nil {
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return "<nil>"
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}
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return pot.ToBin(a.Address())[:8]
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}
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func TestSuggestPeerFindPeers(t *testing.T) {
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tk := newTestKademlia(t, "00000000")
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tk.On("00100000")
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.On("00010000")
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.On("10000000", "10000001")
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.On("01000000")
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tk.Off("10000001")
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tk.checkSuggestPeer("10000001", 0, true)
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tk.On("00100001")
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tk.Off("01000000")
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tk.checkSuggestPeer("01000000", 0, false)
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// second time disconnected peer not callable
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// with reasonably set Interval
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tk.checkSuggestPeer("<nil>", 0, false)
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// on and off again, peer callable again
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tk.On("01000000")
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tk.Off("01000000")
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tk.checkSuggestPeer("01000000", 0, false)
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tk.On("01000000", "10000001")
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.Register("00010001")
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tk.checkSuggestPeer("00010001", 0, false)
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tk.On("00010001")
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tk.Off("01000000")
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tk.checkSuggestPeer("01000000", 0, false)
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tk.On("01000000")
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.Register("01000001")
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tk.checkSuggestPeer("01000001", 0, false)
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tk.On("01000001")
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.Register("10000010", "01000010", "00100010")
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.Register("00010010")
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tk.checkSuggestPeer("00010010", 0, false)
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tk.Off("00100001")
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tk.checkSuggestPeer("00100010", 2, true)
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tk.Off("01000001")
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tk.checkSuggestPeer("01000010", 1, true)
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tk.checkSuggestPeer("01000001", 0, false)
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tk.checkSuggestPeer("00100001", 0, false)
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tk.checkSuggestPeer("<nil>", 0, false)
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tk.On("01000001", "00100001")
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tk.Register("10000100", "01000100", "00100100")
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tk.Register("00000100", "00000101", "00000110")
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tk.Register("00000010", "00000011", "00000001")
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tk.checkSuggestPeer("00000110", 0, false)
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tk.checkSuggestPeer("00000101", 0, false)
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tk.checkSuggestPeer("00000100", 0, false)
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tk.checkSuggestPeer("00000011", 0, false)
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tk.checkSuggestPeer("00000010", 0, false)
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tk.checkSuggestPeer("00000001", 0, false)
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tk.checkSuggestPeer("<nil>", 0, false)
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}
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// a node should stay in the address book if it's removed from the kademlia
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func TestOffEffectingAddressBookNormalNode(t *testing.T) {
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tk := newTestKademlia(t, "00000000")
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// peer added to kademlia
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tk.On("01000000")
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// peer should be in the address book
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if tk.addrs.Size() != 1 {
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t.Fatal("known peer addresses should contain 1 entry")
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}
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// peer should be among live connections
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if tk.conns.Size() != 1 {
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t.Fatal("live peers should contain 1 entry")
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}
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// remove peer from kademlia
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tk.Off("01000000")
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// peer should be in the address book
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if tk.addrs.Size() != 1 {
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t.Fatal("known peer addresses should contain 1 entry")
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}
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// peer should not be among live connections
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if tk.conns.Size() != 0 {
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t.Fatal("live peers should contain 0 entry")
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}
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}
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// a light node should not be in the address book
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func TestOffEffectingAddressBookLightNode(t *testing.T) {
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tk := newTestKademlia(t, "00000000")
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// light node peer added to kademlia
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tk.Kademlia.On(tk.newTestKadPeer("01000000", true))
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// peer should not be in the address book
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if tk.addrs.Size() != 0 {
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t.Fatal("known peer addresses should contain 0 entry")
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}
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// peer should be among live connections
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if tk.conns.Size() != 1 {
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t.Fatal("live peers should contain 1 entry")
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}
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// remove peer from kademlia
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tk.Kademlia.Off(tk.newTestKadPeer("01000000", true))
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// peer should not be in the address book
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if tk.addrs.Size() != 0 {
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t.Fatal("known peer addresses should contain 0 entry")
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}
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// peer should not be among live connections
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if tk.conns.Size() != 0 {
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t.Fatal("live peers should contain 0 entry")
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}
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}
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func TestSuggestPeerRetries(t *testing.T) {
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tk := newTestKademlia(t, "00000000")
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tk.RetryInterval = int64(300 * time.Millisecond) // cycle
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tk.MaxRetries = 50
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tk.RetryExponent = 2
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sleep := func(n int) {
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ts := tk.RetryInterval
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for i := 1; i < n; i++ {
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ts *= int64(tk.RetryExponent)
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}
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time.Sleep(time.Duration(ts))
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}
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tk.Register("01000000")
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tk.On("00000001", "00000010")
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tk.checkSuggestPeer("01000000", 0, false)
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tk.checkSuggestPeer("<nil>", 0, false)
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sleep(1)
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tk.checkSuggestPeer("01000000", 0, false)
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tk.checkSuggestPeer("<nil>", 0, false)
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sleep(1)
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tk.checkSuggestPeer("01000000", 0, false)
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tk.checkSuggestPeer("<nil>", 0, false)
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sleep(2)
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tk.checkSuggestPeer("01000000", 0, false)
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tk.checkSuggestPeer("<nil>", 0, false)
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sleep(2)
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tk.checkSuggestPeer("<nil>", 0, false)
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}
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func TestKademliaHiveString(t *testing.T) {
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tk := newTestKademlia(t, "00000000")
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tk.On("01000000", "00100000")
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tk.Register("10000000", "10000001")
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tk.MaxProxDisplay = 8
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h := tk.String()
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expH := "\n=========================================================================\nMon Feb 27 12:10:28 UTC 2017 KΛÐΞMLIΛ hive: queen's address: 000000\npopulation: 2 (4), NeighbourhoodSize: 2, MinBinSize: 2, MaxBinSize: 4\n============ DEPTH: 0 ==========================================\n000 0 | 2 8100 (0) 8000 (0)\n001 1 4000 | 1 4000 (0)\n002 1 2000 | 1 2000 (0)\n003 0 | 0\n004 0 | 0\n005 0 | 0\n006 0 | 0\n007 0 | 0\n========================================================================="
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if expH[104:] != h[104:] {
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t.Fatalf("incorrect hive output. expected %v, got %v", expH, h)
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}
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}
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func newTestDiscoveryPeer(addr pot.Address, kad *Kademlia) *Peer {
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rw := &p2p.MsgPipeRW{}
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p := p2p.NewPeer(enode.ID{}, "foo", []p2p.Cap{})
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pp := protocols.NewPeer(p, rw, &protocols.Spec{})
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bp := &BzzPeer{
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Peer: pp,
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BzzAddr: &BzzAddr{
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OAddr: addr.Bytes(),
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UAddr: []byte(fmt.Sprintf("%x", addr[:])),
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},
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}
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return NewPeer(bp, kad)
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}
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