mirror of https://github.com/jech/galene.git
488 lines
9.5 KiB
Go
488 lines
9.5 KiB
Go
package packetcache
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import (
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"bytes"
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"math/rand"
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"reflect"
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"sync"
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"testing"
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"github.com/pion/rtcp"
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)
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func randomBuf() []byte {
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length := rand.Int31n(BufSize-1) + 1
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buf := make([]byte, length)
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rand.Read(buf)
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return buf
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}
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func TestCache(t *testing.T) {
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buf1 := randomBuf()
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buf2 := randomBuf()
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cache := New(16)
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_, found := cache.Last()
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if found {
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t.Errorf("Found in empty cache")
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}
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_, i1 := cache.Store(13, 42, false, false, buf1)
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_, i2 := cache.Store(17, 42, false, false, buf2)
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seqno, found := cache.Last()
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if !found {
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t.Errorf("Not found")
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}
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if seqno != 17 {
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t.Errorf("Expected %v, got %v", 17, seqno)
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}
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buf := make([]byte, BufSize)
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l := cache.Get(13, buf)
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if !bytes.Equal(buf[:l], buf1) {
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t.Errorf("Couldn't get 13")
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}
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l = cache.Get(13, nil)
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if l != uint16(len(buf1)) {
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t.Errorf("Couldn't retrieve length")
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}
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l = cache.GetAt(13, i1, buf)
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if !bytes.Equal(buf[:l], buf1) {
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t.Errorf("Couldn't get 13 at %v", i1)
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}
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l = cache.Get(17, buf)
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if !bytes.Equal(buf[:l], buf2) {
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t.Errorf("Couldn't get 17")
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}
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l = cache.GetAt(17, i2, buf)
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if !bytes.Equal(buf[:l], buf2) {
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t.Errorf("Couldn't get 17 at %v", i2)
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}
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l = cache.Get(42, buf)
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if l != 0 {
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t.Errorf("Creation ex nihilo")
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}
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l = cache.GetAt(17, i1, buf)
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if l != 0 {
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t.Errorf("Got 17 at %v", i1)
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}
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l = cache.GetAt(42, i2, buf)
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if l != 0 {
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t.Errorf("Got 42 at %v", i2)
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}
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}
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func TestCacheOverflow(t *testing.T) {
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cache := New(16)
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for i := 0; i < 32; i++ {
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cache.Store(uint16(i), 0, false, false, []byte{uint8(i)})
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}
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for i := 0; i < 32; i++ {
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buf := make([]byte, BufSize)
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l := cache.Get(uint16(i), buf)
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if i < 16 {
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if l > 0 {
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t.Errorf("Creation ex nihilo: %v", i)
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}
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} else {
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if l != 1 || buf[0] != uint8(i) {
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t.Errorf("Expected [%v], got %v", i, buf[:l])
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}
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}
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}
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}
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func TestCacheGrow(t *testing.T) {
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cache := New(16)
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for i := 0; i < 24; i++ {
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cache.Store(uint16(i), 0, false, false, []byte{uint8(i)})
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}
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cache.Resize(32)
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for i := 0; i < 32; i++ {
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expected := uint16(0)
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if i < 8 {
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expected = uint16(i + 16)
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}
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if i >= 24 {
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expected = uint16(i - 16)
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}
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if cache.entries[i].seqno != expected {
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t.Errorf("At %v, got %v, expected %v",
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i, cache.entries[i].seqno, expected)
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}
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}
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}
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func TestCacheShrink(t *testing.T) {
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cache := New(16)
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for i := 0; i < 24; i++ {
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cache.Store(uint16(i), 0, false, false, []byte{uint8(i)})
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}
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cache.Resize(12)
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for i := 0; i < 12; i++ {
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expected := uint16(i + 16)
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if i >= 8 {
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expected = uint16(i + 4)
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}
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if cache.entries[i].seqno != expected {
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t.Errorf("At %v, got %v, expected %v",
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i, cache.entries[i].seqno, expected)
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}
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}
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}
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func TestCacheGrowCond(t *testing.T) {
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cache := New(16)
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if len(cache.entries) != 16 {
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t.Errorf("Expected 16, got %v", len(cache.entries))
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}
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done := cache.ResizeCond(17)
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if done || len(cache.entries) != 16 {
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t.Errorf("Grew cache by 1")
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}
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done = cache.ResizeCond(15)
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if done || len(cache.entries) != 16 {
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t.Errorf("Shrunk cache by 1")
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}
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done = cache.ResizeCond(32)
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if !done || len(cache.entries) != 32 {
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t.Errorf("Didn't grow cache")
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}
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done = cache.ResizeCond(16)
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if !done || len(cache.entries) != 16 {
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t.Errorf("Didn't shrink cache")
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}
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}
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func TestBitmap(t *testing.T) {
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value := uint64(0xcdd58f1e035379c0)
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packet := make([]byte, 1)
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cache := New(16)
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var first uint16
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for i := 0; i < 64; i++ {
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if (value & (1 << i)) != 0 {
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first, _ = cache.Store(uint16(42+i), 0, false, false, packet)
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}
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}
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value >>= uint16(first - 42)
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if uint32(value) != cache.bitmap.bitmap {
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t.Errorf("Got %b, expected %b", cache.bitmap.bitmap, value)
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}
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}
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func TestBitmapWrap(t *testing.T) {
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value := uint64(0xcdd58f1e035379c0)
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packet := make([]byte, 1)
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cache := New(16)
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cache.Store(0x7000, 0, false, false, packet)
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cache.Store(0xA000, 0, false, false, packet)
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var first uint16
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for i := 0; i < 64; i++ {
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if (value & (1 << i)) != 0 {
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first, _ = cache.Store(uint16(42+i), 0, false, false, packet)
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}
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}
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value >>= uint16(first - 42)
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if uint32(value) != cache.bitmap.bitmap {
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t.Errorf("Got %b, expected %b", cache.bitmap.bitmap, value)
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}
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}
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func TestBitmapGet(t *testing.T) {
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value := uint64(0xcdd58f1e035379c0)
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packet := make([]byte, 1)
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cache := New(16)
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for i := 0; i < 64; i++ {
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if (value & (1 << i)) != 0 {
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cache.Store(uint16(42+i), 0, false, false, packet)
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}
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}
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pos := uint16(42)
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for cache.bitmap.bitmap != 0 {
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found, first, bitmap := cache.BitmapGet(42 + 65)
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if first < pos || first >= pos+64 {
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t.Errorf("First is %v, pos is %v", first, pos)
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}
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if !found {
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t.Fatalf("Didn't find any 0 bits")
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}
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value >>= (first - pos)
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pos = first
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if (value & 1) != 0 {
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t.Errorf("Value is odd")
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}
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value >>= 1
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pos += 1
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for bitmap != 0 {
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if uint8(bitmap&1) == uint8(value&1) {
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t.Errorf("Bitmap mismatch")
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}
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bitmap >>= 1
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value >>= 1
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pos += 1
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}
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}
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if value != 0 {
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t.Errorf("Value is %v", value)
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}
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}
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func TestBitmapPacket(t *testing.T) {
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value := uint64(0xcdd58f1e035379c0)
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packet := make([]byte, 1)
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cache := New(16)
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for i := 0; i < 64; i++ {
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if (value & (1 << i)) != 0 {
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cache.Store(uint16(42+i), 0, false, false, packet)
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}
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}
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found, first, bitmap := cache.BitmapGet(42 + 65)
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if !found {
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t.Fatalf("Didn't find any 0 bits")
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}
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p := rtcp.NackPair{first, rtcp.PacketBitmap(bitmap)}
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p.Range(func(s uint16) bool {
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if s < 42 || s >= 42+64 {
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if (value & (1 << (s - 42))) != 0 {
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t.Errorf("Bit %v unexpectedly set", s-42)
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}
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}
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return true
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})
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}
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func BenchmarkCachePutGet(b *testing.B) {
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n := 10
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chans := make([]chan uint16, n)
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for i := range chans {
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chans[i] = make(chan uint16, 8)
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}
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cache := New(96)
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var wg sync.WaitGroup
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wg.Add(len(chans))
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for i := range chans {
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go func(ch <-chan uint16) {
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defer wg.Done()
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buf := make([]byte, BufSize)
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for {
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seqno, ok := <-ch
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if !ok {
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return
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}
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l := cache.Get(seqno, buf)
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if l == 0 {
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b.Errorf("Couldn't get %v", seqno)
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}
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}
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}(chans[i])
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}
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buf := make([]byte, 1200)
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b.SetBytes(1200)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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seqno := uint16(i)
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cache.Store(seqno, 0, false, false, buf)
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for _, ch := range chans {
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ch <- seqno
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}
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}
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for _, ch := range chans {
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close(ch)
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}
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wg.Wait()
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}
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type is struct {
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index, seqno uint16
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}
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func BenchmarkCachePutGetAt(b *testing.B) {
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n := 10
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chans := make([]chan is, n)
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for i := range chans {
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chans[i] = make(chan is, 8)
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}
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cache := New(96)
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var wg sync.WaitGroup
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wg.Add(len(chans))
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for i := range chans {
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go func(ch <-chan is) {
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defer wg.Done()
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buf := make([]byte, BufSize)
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for {
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is, ok := <-ch
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if !ok {
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return
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}
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l := cache.GetAt(is.seqno, is.index, buf)
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if l == 0 {
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b.Errorf("Couldn't get %v", is)
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}
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}
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}(chans[i])
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}
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buf := make([]byte, 1200)
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b.SetBytes(1200)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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seqno := uint16(i)
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_, index := cache.Store(seqno, 0, false, false, buf)
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for _, ch := range chans {
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ch <- is{index, seqno}
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}
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}
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for _, ch := range chans {
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close(ch)
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}
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wg.Wait()
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}
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func TestToBitmap(t *testing.T) {
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l := []uint16{18, 19, 32, 38}
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bb := uint16(1 | 1<<(32-18-1))
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f, b, r := ToBitmap(l)
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if f != 18 || b != bb {
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t.Errorf("Expected %v %v, Got %v %v", 18, bb, f, b)
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}
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if len(r) != 1 || r[0] != 38 {
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t.Errorf("Expected [38], got %v", r)
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}
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f2, b2, r2 := ToBitmap(r)
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if f2 != 38 || b2 != 0 || len(r2) != 0 {
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t.Errorf("Expected 38 0, got %v %v %v", f2, b2, r2)
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}
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}
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func TestToBitmapNack(t *testing.T) {
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l := []uint16{18, 19, 32, 38}
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var nacks []rtcp.NackPair
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m := l
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for len(m) > 0 {
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var f, b uint16
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f, b, m = ToBitmap(m)
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nacks = append(nacks, rtcp.NackPair{f, rtcp.PacketBitmap(b)})
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}
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var n []uint16
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for len(nacks) > 0 {
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n = append(n, nacks[0].PacketList()...)
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nacks = nacks[1:]
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}
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if !reflect.DeepEqual(l, n) {
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t.Errorf("Expected %v, got %v", l, n)
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}
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}
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func TestCacheStatsFull(t *testing.T) {
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cache := New(16)
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for i := 0; i < 32; i++ {
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cache.Store(uint16(i), 0, false, false, []byte{uint8(i)})
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}
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stats := cache.GetStats(false)
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if stats.Received != 32 ||
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stats.TotalReceived != 32 ||
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stats.Expected != 32 ||
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stats.TotalExpected != 32 ||
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stats.ESeqno != 31 {
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t.Errorf("Expected 32, 32, 32, 32, 31, got %v", stats)
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}
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}
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func TestCacheStatsDrop(t *testing.T) {
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cache := New(16)
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for i := 0; i < 32; i++ {
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if i != 8 && i != 10 {
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cache.Store(uint16(i), 0, false, false, []byte{uint8(i)})
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}
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}
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stats := cache.GetStats(false)
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if stats.Received != 30 ||
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stats.TotalReceived != 30 ||
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stats.Expected != 32 ||
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stats.TotalExpected != 32 ||
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stats.ESeqno != 31 {
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t.Errorf("Expected 30, 30, 32, 32, 31, got %v", stats)
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}
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}
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func TestCacheStatsUnordered(t *testing.T) {
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cache := New(16)
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for i := 0; i < 32; i++ {
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if i != 8 && i != 10 {
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cache.Store(uint16(i), 0, false, false, []byte{uint8(i)})
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}
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}
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cache.Store(uint16(8), 0, false, false, []byte{8})
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cache.Store(uint16(10), 0, false, false, []byte{10})
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stats := cache.GetStats(false)
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if stats.Received != 32 ||
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stats.TotalReceived != 32 ||
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stats.Expected != 32 ||
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stats.TotalExpected != 32 ||
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stats.ESeqno != 31 {
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t.Errorf("Expected 32, 32, 32, 32, 31, got %v", stats)
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}
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}
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func TestCacheStatsNack(t *testing.T) {
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cache := New(16)
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for i := 0; i < 32; i++ {
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if i != 8 && i != 10 {
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cache.Store(uint16(i), 0, false, false, []byte{uint8(i)})
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}
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}
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cache.Expect(2)
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cache.Store(uint16(8), 0, false, false, []byte{8})
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cache.Store(uint16(10), 0, false, false, []byte{10})
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stats := cache.GetStats(false)
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if stats.Received != 32 ||
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stats.TotalReceived != 32 ||
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stats.Expected != 34 ||
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stats.TotalExpected != 34 ||
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stats.ESeqno != 31 {
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t.Errorf("Expected 32, 32, 34, 34, 31, got %v", stats)
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}
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}
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