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// Copyright (C) 2019 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package protocol
import (
"sync"
"testing"
"time"
"github.com/syncthing/syncthing/lib/rand"
)
func TestGetBucketNumbers(t *testing.T) {
cases := []struct {
size int
bkt int
panics bool
}{
{size: 1024, bkt: 0},
{size: MinBlockSize, bkt: 0},
{size: MinBlockSize + 1, bkt: 1},
{size: 2*MinBlockSize - 1, bkt: 1},
{size: 2 * MinBlockSize, bkt: 1},
{size: 2*MinBlockSize + 1, bkt: 2},
{size: MaxBlockSize, bkt: len(BlockSizes) - 1},
{size: MaxBlockSize + 1, panics: true},
}
for _, tc := range cases {
if tc.panics {
shouldPanic(t, func() { getBucketForLen(tc.size) })
} else {
res := getBucketForLen(tc.size)
if res != tc.bkt {
t.Errorf("block of size %d should get from bucket %d, not %d", tc.size, tc.bkt, res)
}
}
}
}
func TestPutBucketNumbers(t *testing.T) {
cases := []struct {
size int
bkt int
panics bool
}{
{size: 1024, panics: true},
{size: MinBlockSize, bkt: 0},
{size: MinBlockSize + 1, panics: true},
{size: 2 * MinBlockSize, bkt: 1},
{size: MaxBlockSize, bkt: len(BlockSizes) - 1},
{size: MaxBlockSize + 1, panics: true},
}
for _, tc := range cases {
if tc.panics {
shouldPanic(t, func() { putBucketForCap(tc.size) })
} else {
res := putBucketForCap(tc.size)
if res != tc.bkt {
t.Errorf("block of size %d should put into bucket %d, not %d", tc.size, tc.bkt, res)
}
}
}
}
func TestStressBufferPool(t *testing.T) {
if testing.Short() {
t.Skip()
}
const routines = 10
const runtime = 2 * time.Second
bp := newBufferPool()
t0 := time.Now()
var wg sync.WaitGroup
fail := make(chan struct{}, routines)
for i := 0; i < routines; i++ {
wg.Add(1)
go func() {
defer wg.Done()
for time.Since(t0) < runtime {
blocks := make([][]byte, 10)
for i := range blocks {
// Request a block of random size with the range
// covering smaller-than-min to larger-than-max and
// everything in between.
want := rand.Intn(1.5 * MaxBlockSize)
blocks[i] = bp.Get(want)
if len(blocks[i]) != want {
fail <- struct{}{}
return
}
}
for i := range blocks {
bp.Put(blocks[i])
}
}
}()
}
wg.Wait()
select {
case <-fail:
t.Fatal("a block was bad size")
default:
}
t.Log(bp.puts.Load(), bp.skips.Load(), bp.misses.Load(), bp.hits)
if bp.puts.Load() == 0 || bp.skips.Load() == 0 || bp.misses.Load() == 0 {
t.Error("didn't exercise some paths")
}
var hits int64
for i := range bp.hits {
hits += bp.hits[i].Load()
}
if hits == 0 {
t.Error("didn't exercise some paths")
}
}
func shouldPanic(t *testing.T, fn func()) {
defer func() {
if r := recover(); r == nil {
t.Errorf("did not panic")
}
}()
fn()
}
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