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350 lines
9.3 KiB
350 lines
9.3 KiB
// Copyright 2020 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 les
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import (
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"math/rand"
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"sync/atomic"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/ethdb/memorydb"
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vfc "github.com/ethereum/go-ethereum/les/vflux/client"
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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/enr"
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)
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const (
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spTestNodes = 1000
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spTestTarget = 5
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spTestLength = 10000
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spMinTotal = 40000
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spMaxTotal = 50000
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)
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func testNodeID(i int) enode.ID {
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return enode.ID{42, byte(i % 256), byte(i / 256)}
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}
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func testNodeIndex(id enode.ID) int {
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if id[0] != 42 {
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return -1
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}
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return int(id[1]) + int(id[2])*256
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}
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type serverPoolTest struct {
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db ethdb.KeyValueStore
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clock *mclock.Simulated
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quit chan struct{}
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preNeg, preNegFail bool
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vt *vfc.ValueTracker
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sp *serverPool
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input enode.Iterator
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testNodes []spTestNode
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trusted []string
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waitCount, waitEnded int32
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cycle, conn, servedConn int
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serviceCycles, dialCount int
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disconnect map[int][]int
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}
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type spTestNode struct {
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connectCycles, waitCycles int
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nextConnCycle, totalConn int
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connected, service bool
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peer *serverPeer
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}
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func newServerPoolTest(preNeg, preNegFail bool) *serverPoolTest {
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nodes := make([]*enode.Node, spTestNodes)
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for i := range nodes {
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nodes[i] = enode.SignNull(&enr.Record{}, testNodeID(i))
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}
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return &serverPoolTest{
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clock: &mclock.Simulated{},
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db: memorydb.New(),
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input: enode.CycleNodes(nodes),
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testNodes: make([]spTestNode, spTestNodes),
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preNeg: preNeg,
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preNegFail: preNegFail,
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}
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}
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func (s *serverPoolTest) beginWait() {
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// ensure that dialIterator and the maximal number of pre-neg queries are not all stuck in a waiting state
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for atomic.AddInt32(&s.waitCount, 1) > preNegLimit {
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atomic.AddInt32(&s.waitCount, -1)
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s.clock.Run(time.Second)
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}
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}
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func (s *serverPoolTest) endWait() {
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atomic.AddInt32(&s.waitCount, -1)
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atomic.AddInt32(&s.waitEnded, 1)
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}
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func (s *serverPoolTest) addTrusted(i int) {
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s.trusted = append(s.trusted, enode.SignNull(&enr.Record{}, testNodeID(i)).String())
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}
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func (s *serverPoolTest) start() {
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var testQuery queryFunc
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if s.preNeg {
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testQuery = func(node *enode.Node) int {
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idx := testNodeIndex(node.ID())
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n := &s.testNodes[idx]
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canConnect := !n.connected && n.connectCycles != 0 && s.cycle >= n.nextConnCycle
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if s.preNegFail {
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// simulate a scenario where UDP queries never work
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s.beginWait()
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s.clock.Sleep(time.Second * 5)
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s.endWait()
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return -1
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}
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switch idx % 3 {
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case 0:
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// pre-neg returns true only if connection is possible
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if canConnect {
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return 1
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}
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return 0
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case 1:
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// pre-neg returns true but connection might still fail
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return 1
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case 2:
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// pre-neg returns true if connection is possible, otherwise timeout (node unresponsive)
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if canConnect {
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return 1
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}
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s.beginWait()
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s.clock.Sleep(time.Second * 5)
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s.endWait()
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return -1
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}
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return -1
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}
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}
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s.vt = vfc.NewValueTracker(s.db, s.clock, requestList, time.Minute, 1/float64(time.Hour), 1/float64(time.Hour*100), 1/float64(time.Hour*1000))
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s.sp = newServerPool(s.db, []byte("serverpool:"), s.vt, 0, testQuery, s.clock, s.trusted)
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s.sp.addSource(s.input)
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s.sp.validSchemes = enode.ValidSchemesForTesting
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s.sp.unixTime = func() int64 { return int64(s.clock.Now()) / int64(time.Second) }
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s.disconnect = make(map[int][]int)
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s.sp.start()
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s.quit = make(chan struct{})
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go func() {
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last := int32(-1)
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for {
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select {
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case <-time.After(time.Millisecond * 100):
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c := atomic.LoadInt32(&s.waitEnded)
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if c == last {
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// advance clock if test is stuck (might happen in rare cases)
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s.clock.Run(time.Second)
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}
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last = c
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case <-s.quit:
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return
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}
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}
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}()
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}
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func (s *serverPoolTest) stop() {
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close(s.quit)
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s.sp.stop()
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s.vt.Stop()
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for i := range s.testNodes {
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n := &s.testNodes[i]
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if n.connected {
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n.totalConn += s.cycle
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}
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n.connected = false
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n.peer = nil
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n.nextConnCycle = 0
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}
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s.conn, s.servedConn = 0, 0
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}
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func (s *serverPoolTest) run() {
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for count := spTestLength; count > 0; count-- {
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if dcList := s.disconnect[s.cycle]; dcList != nil {
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for _, idx := range dcList {
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n := &s.testNodes[idx]
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s.sp.unregisterPeer(n.peer)
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n.totalConn += s.cycle
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n.connected = false
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n.peer = nil
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s.conn--
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if n.service {
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s.servedConn--
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}
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n.nextConnCycle = s.cycle + n.waitCycles
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}
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delete(s.disconnect, s.cycle)
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}
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if s.conn < spTestTarget {
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s.dialCount++
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s.beginWait()
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s.sp.dialIterator.Next()
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s.endWait()
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dial := s.sp.dialIterator.Node()
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id := dial.ID()
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idx := testNodeIndex(id)
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n := &s.testNodes[idx]
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if !n.connected && n.connectCycles != 0 && s.cycle >= n.nextConnCycle {
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s.conn++
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if n.service {
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s.servedConn++
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}
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n.totalConn -= s.cycle
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n.connected = true
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dc := s.cycle + n.connectCycles
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s.disconnect[dc] = append(s.disconnect[dc], idx)
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n.peer = &serverPeer{peerCommons: peerCommons{Peer: p2p.NewPeer(id, "", nil)}}
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s.sp.registerPeer(n.peer)
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if n.service {
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s.vt.Served(s.vt.GetNode(id), []vfc.ServedRequest{{ReqType: 0, Amount: 100}}, 0)
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}
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}
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}
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s.serviceCycles += s.servedConn
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s.clock.Run(time.Second)
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s.cycle++
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}
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}
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func (s *serverPoolTest) setNodes(count, conn, wait int, service, trusted bool) (res []int) {
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for ; count > 0; count-- {
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idx := rand.Intn(spTestNodes)
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for s.testNodes[idx].connectCycles != 0 || s.testNodes[idx].connected {
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idx = rand.Intn(spTestNodes)
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}
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res = append(res, idx)
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s.testNodes[idx] = spTestNode{
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connectCycles: conn,
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waitCycles: wait,
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service: service,
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}
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if trusted {
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s.addTrusted(idx)
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}
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}
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return
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}
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func (s *serverPoolTest) resetNodes() {
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for i, n := range s.testNodes {
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if n.connected {
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n.totalConn += s.cycle
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s.sp.unregisterPeer(n.peer)
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}
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s.testNodes[i] = spTestNode{totalConn: n.totalConn}
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}
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s.conn, s.servedConn = 0, 0
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s.disconnect = make(map[int][]int)
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s.trusted = nil
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}
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func (s *serverPoolTest) checkNodes(t *testing.T, nodes []int) {
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var sum int
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for _, idx := range nodes {
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n := &s.testNodes[idx]
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if n.connected {
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n.totalConn += s.cycle
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}
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sum += n.totalConn
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n.totalConn = 0
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if n.connected {
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n.totalConn -= s.cycle
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}
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}
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if sum < spMinTotal || sum > spMaxTotal {
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t.Errorf("Total connection amount %d outside expected range %d to %d", sum, spMinTotal, spMaxTotal)
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}
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}
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func TestServerPool(t *testing.T) { testServerPool(t, false, false) }
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func TestServerPoolWithPreNeg(t *testing.T) { testServerPool(t, true, false) }
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func TestServerPoolWithPreNegFail(t *testing.T) { testServerPool(t, true, true) }
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func testServerPool(t *testing.T, preNeg, fail bool) {
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s := newServerPoolTest(preNeg, fail)
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nodes := s.setNodes(100, 200, 200, true, false)
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s.setNodes(100, 20, 20, false, false)
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s.start()
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s.run()
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s.stop()
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s.checkNodes(t, nodes)
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}
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func TestServerPoolChangedNodes(t *testing.T) { testServerPoolChangedNodes(t, false) }
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func TestServerPoolChangedNodesWithPreNeg(t *testing.T) { testServerPoolChangedNodes(t, true) }
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func testServerPoolChangedNodes(t *testing.T, preNeg bool) {
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s := newServerPoolTest(preNeg, false)
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nodes := s.setNodes(100, 200, 200, true, false)
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s.setNodes(100, 20, 20, false, false)
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s.start()
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s.run()
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s.checkNodes(t, nodes)
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for i := 0; i < 3; i++ {
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s.resetNodes()
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nodes := s.setNodes(100, 200, 200, true, false)
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s.setNodes(100, 20, 20, false, false)
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s.run()
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s.checkNodes(t, nodes)
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}
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s.stop()
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}
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func TestServerPoolRestartNoDiscovery(t *testing.T) { testServerPoolRestartNoDiscovery(t, false) }
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func TestServerPoolRestartNoDiscoveryWithPreNeg(t *testing.T) {
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testServerPoolRestartNoDiscovery(t, true)
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}
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func testServerPoolRestartNoDiscovery(t *testing.T, preNeg bool) {
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s := newServerPoolTest(preNeg, false)
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nodes := s.setNodes(100, 200, 200, true, false)
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s.setNodes(100, 20, 20, false, false)
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s.start()
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s.run()
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s.stop()
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s.checkNodes(t, nodes)
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s.input = nil
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s.start()
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s.run()
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s.stop()
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s.checkNodes(t, nodes)
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}
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func TestServerPoolTrustedNoDiscovery(t *testing.T) { testServerPoolTrustedNoDiscovery(t, false) }
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func TestServerPoolTrustedNoDiscoveryWithPreNeg(t *testing.T) {
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testServerPoolTrustedNoDiscovery(t, true)
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}
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func testServerPoolTrustedNoDiscovery(t *testing.T, preNeg bool) {
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s := newServerPoolTest(preNeg, false)
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trusted := s.setNodes(200, 200, 200, true, true)
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s.input = nil
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s.start()
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s.run()
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s.stop()
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s.checkNodes(t, trusted)
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}
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