d96870428f
This PR implements the first one of the "lespay" UDP queries which is already useful in itself: the capacity query. The server pool is making use of this query by doing a cheap UDP query to determine whether it is worth starting the more expensive TCP connection process.
125 lines
2.8 KiB
Go
125 lines
2.8 KiB
Go
// Copyright 2019 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 prque
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import (
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"math/rand"
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"sync"
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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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)
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const (
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testItems = 1000
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testPriorityStep = 100
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testSteps = 1000000
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testStepPeriod = time.Millisecond
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testQueueRefresh = time.Second
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testAvgRate = float64(testPriorityStep) / float64(testItems) / float64(testStepPeriod)
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)
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type lazyItem struct {
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p, maxp int64
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last mclock.AbsTime
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index int
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}
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func testPriority(a interface{}) int64 {
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return a.(*lazyItem).p
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}
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func testMaxPriority(a interface{}, until mclock.AbsTime) int64 {
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i := a.(*lazyItem)
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dt := until - i.last
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i.maxp = i.p + int64(float64(dt)*testAvgRate)
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return i.maxp
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}
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func testSetIndex(a interface{}, i int) {
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a.(*lazyItem).index = i
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}
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func TestLazyQueue(t *testing.T) {
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rand.Seed(time.Now().UnixNano())
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clock := &mclock.Simulated{}
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q := NewLazyQueue(testSetIndex, testPriority, testMaxPriority, clock, testQueueRefresh)
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var (
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items [testItems]lazyItem
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maxPri int64
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)
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for i := range items[:] {
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items[i].p = rand.Int63n(testPriorityStep * 10)
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if items[i].p > maxPri {
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maxPri = items[i].p
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}
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items[i].index = -1
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q.Push(&items[i])
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}
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var (
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lock sync.Mutex
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wg sync.WaitGroup
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stopCh = make(chan chan struct{})
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)
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defer wg.Wait()
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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select {
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case <-clock.After(testQueueRefresh):
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lock.Lock()
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q.Refresh()
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lock.Unlock()
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case <-stopCh:
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return
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}
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}
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}()
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for c := 0; c < testSteps; c++ {
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i := rand.Intn(testItems)
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lock.Lock()
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items[i].p += rand.Int63n(testPriorityStep*2-1) + 1
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if items[i].p > maxPri {
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maxPri = items[i].p
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}
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items[i].last = clock.Now()
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if items[i].p > items[i].maxp {
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q.Update(items[i].index)
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}
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if rand.Intn(100) == 0 {
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p := q.PopItem().(*lazyItem)
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if p.p != maxPri {
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lock.Unlock()
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close(stopCh)
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t.Fatalf("incorrect item (best known priority %d, popped %d)", maxPri, p.p)
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}
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q.Push(p)
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}
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lock.Unlock()
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clock.Run(testStepPeriod)
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clock.WaitForTimers(1)
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}
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close(stopCh)
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}
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