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package cache
import (
"context"
"fmt"
"github.com/alistanis/cache/list"
"github.com/stretchr/testify/assert"
"log"
"math/rand"
"os"
"runtime"
"testing"
"time"
"unsafe"
)
// Example_singleCache is a simple example that is shown with a concurrency of 1 in order to illustrate how the smaller LRU
// caches work.
func Example_singleCache() {
ctx, cancel := context.WithCancel(context.Background())
capacityPerPartition := 5
// this determines how many LRU backing
// caches are used and how many caches can be accessed concurrently
numberOfCaches := 1
c := New[int, int](ctx, capacityPerPartition, numberOfCaches)
defer c.Wait()
c.Put(42, 42)
c.Put(1, 1)
c.Get(42)
c.Put(0, 0)
c.Put(2, 2)
c.Put(3, 3)
c.Get(42)
// evict 1
c.Put(4, 4)
c.Each(func(key int, val int) {
fmt.Println(key)
})
cancel()
// Output:
// 4
// 42
// 3
// 2
// 0
}
// Example serves as a general example for using the Cache object. Since elements are spread across many partitions,
// order can not be guaranteed, and items will not be evicted in pure LRU terms; it is possible that some partitions
// may see more traffic than others and may be more eviction heavy, but generally, access patterns amortize evenly.
func Example() {
ctx, cancel := context.WithCancel(context.Background())
concurrency := 10 // runtime.NumCPU() instead of 10 for actual use
c := New[int, int](ctx, 6, concurrency)
defer c.Wait()
fmt.Println(c.Meta().Len())
fmt.Println(c.Meta().Cap())
finished := make(chan struct{})
go func() {
for i := 0; i < 4*concurrency; i++ {
c.Put(i, i)
}
finished <- struct{}{}
}()
go func() {
for i := 8 * concurrency; i > 3*concurrency; i-- {
c.Put(i, i)
}
finished <- struct{}{}
}()
<-finished
<-finished
for i := 0; i < 8*concurrency; i++ {
v, found := c.Get(i)
if !found {
// get value from backing store
// res := db.Query(...)
// v = getValFromRes(res)
v = 0
} else {
if i != v {
panic("uh oh")
}
}
}
// we've put enough values into the lruCache that 10 partitions are filled with 6 elements each
fmt.Println(c.Meta().Len())
fmt.Println(c.Meta().Cap())
// Output:
// 0
// 60
// 60
// 60
cancel()
}
func Test_lruCache(t *testing.T) {
Assert := assert.New(t)
c := newLruCache[int, string](4)
c.Put(42, "42")
Assert.EqualValues(c.Size(), 1)
s, ok := c.Get(42)
Assert.True(ok)
Assert.EqualValues("42", s)
s, ok = c.Get(0)
Assert.False(ok)
// replace existing value
c.Put(42, "24")
s, ok = c.Get(42)
Assert.True(ok)
Assert.EqualValues("24", s)
c.Resize(1)
c.Put(24, "42")
Assert.EqualValues(1, c.Size())
s, ok = c.Get(24)
Assert.True(ok)
Assert.EqualValues("42", s)
c.Resize(2)
// resizing does not crash
Assert.NotPanics(func() { c.Resize(2) })
c.Put(42, "24")
Assert.EqualValues(2, c.Size())
s, ok = c.Get(42)
Assert.True(ok)
Assert.EqualValues("24", s)
c.Put(1, "2")
Assert.EqualValues(2, c.Size())
s, ok = c.Get(42)
Assert.True(ok)
Assert.EqualValues("24", s)
_, ok = c.Get(24)
Assert.False(ok)
n := c.list.Front()
Assert.EqualValues("24", n.Value.Val)
c.Resize(4)
Assert.EqualValues(4, c.Capacity())
Assert.EqualValues(2, c.Size())
c.Put(2, "3")
c.Put(3, "4")
Assert.EqualValues(4, c.Size())
c.Put(4, "5")
Assert.EqualValues(4, c.Size())
c.Resize(1)
Assert.EqualValues(1, c.Size())
s, ok = c.Get(4)
Assert.True(ok)
Assert.EqualValues("5", s)
c.evict()
c.evict()
c.evict()
c.evict()
Assert.NotPanics(func() { c.evict() })
}
type sPair struct {
s1 string
s2 string
}
func Test_cache_Serve(t *testing.T) {
Assert := assert.New(t)
ca := newLruCache[string, string](5)
ctx, cancel := context.WithCancel(context.Background())
c := ca.serve(ctx)
defer c.Wait()
pairs := []sPair{
{"Hello", "Goodbye"},
{"1", "2"},
{"4", "5"},
{"24", "42"},
{"3.14", "6.28"},
}
for _, p := range pairs {
c.Put(p.s1, p.s2)
}
r := c.Get("24")
Assert.True(r.Found)
Assert.EqualValues("42", r.Val)
r = c.Get("nil")
Assert.False(r.Found)
c.Each(func(s1 string, s2 string) {
fmt.Println(s1 + " " + s2)
})
cancel()
}
func TestCache(t *testing.T) {
Assert := assert.New(t)
ctx, cancel := context.WithCancel(context.Background())
capacity := 1000
c := New[int, int](ctx, capacity, runtime.NumCPU())
defer c.Wait()
for i := 0; i < capacity*10*runtime.NumCPU(); i++ {
c.Put(i, i)
}
met := c.Meta()
Assert.EqualValues(capacity*runtime.NumCPU(), met.Cap())
Assert.EqualValues(capacity*runtime.NumCPU(), met.Len())
c.Put(1, 1)
found := c.Remove(1)
Assert.True(found)
found = c.Remove(1)
Assert.False(found)
c.Put(1, 1)
v, found := c.Get(1)
Assert.EqualValues(1, v)
Assert.True(found)
i := make([]int, 0, capacity*runtime.NumCPU())
c.Each(func(k, v int) {
i = append(i, v)
})
Assert.EqualValues(capacity*runtime.NumCPU(), len(i))
cancel()
}
func TestCache_String(t *testing.T) {
Assert := assert.New(t)
ctx, cancel := context.WithCancel(context.Background())
capacity := 1000
c := New[string, string](ctx, capacity, runtime.NumCPU())
defer c.Wait()
r := rand.New(rand.NewSource(time.Now().UnixNano()))
b := make([]byte, 8)
for i := 0; i < capacity*10*runtime.NumCPU(); i++ {
read, err := r.Read(b)
Assert.EqualValues(8, read)
Assert.Nil(err)
c.Put(string(b), string(b))
}
met := c.Meta()
Assert.EqualValues(capacity*runtime.NumCPU(), met.Cap())
Assert.EqualValues(capacity*runtime.NumCPU(), met.Len())
v, found := c.Get(string(b))
Assert.True(found)
Assert.EqualValues(string(b), v)
cancel()
}
func TestCache_Concurrently(t *testing.T) {
Assert := assert.New(t)
ctx, cancel1 := context.WithCancel(context.Background())
capacity := 100
c := New[int, int](ctx, capacity, runtime.NumCPU())
defer c.Wait()
for i := 0; c.Meta().Len() != capacity*runtime.NumCPU(); i++ {
c.Put(i, i)
}
is := make([]int, 0, runtime.NumCPU()*capacity)
c.Each(func(k, v int) {
is = append(is, v)
})
firstPartitionValues := make([]int, 0, capacity)
for i := 0; i < capacity; i++ {
index := i % len(is)
if index != 0 {
continue
}
firstPartitionValues = append(firstPartitionValues, is[index])
}
getWait := make(chan struct{})
putWait := make(chan struct{})
c2, cancel2 := context.WithCancel(context.Background())
go func(ct context.Context) {
for {
select {
case <-ct.Done():
getWait <- struct{}{}
return
default:
for _, i := range firstPartitionValues {
v, found := c.Get(i)
Assert.True(found)
Assert.EqualValues(i, v)
}
}
}
}(c2)
go func() {
for i := 0; i < capacity; i++ {
index := i % len(is)
if index != 0 {
continue
}
c.Put(i, i)
}
putWait <- struct{}{}
}()
<-putWait
cancel2()
<-getWait
Assert.EqualValues(capacity*runtime.NumCPU(), c.Meta().Len())
cancel1()
}
func TestCache_EvictionFunction(t *testing.T) {
Assert := assert.New(t)
ctx, cancel := context.WithCancel(context.Background())
errC := make(chan error)
c := WithEvictionFunction(ctx, 1, 1, func(s string, f *os.File) {
_, err := f.Stat()
if err != nil {
errC <- err
return
}
log.Printf("Closing file at path %s, fd: %d", s, f.Fd())
errC <- f.Close()
})
defer c.Wait()
defer cancel()
d, err := os.MkdirTemp("", "")
Assert.Nil(err)
defer func(path string) {
err := os.RemoveAll(path)
Assert.Nil(err)
}(d)
exit := make(chan struct{})
go func() {
for e := range errC {
if e != nil {
t.Error(e)
}
}
exit <- struct{}{}
}()
f, err := os.CreateTemp(d, "")
if err != nil {
t.Error(err)
}
c.Put(f.Name(), f)
f2, err := os.CreateTemp(d, "")
if err != nil {
t.Error(err)
}
// evict f and cause the eviction function to fire, closing the file
c.Put(f2.Name(), f2)
// now evict f2
evicted := c.Evict()
Assert.EqualValues(1, evicted)
Assert.Zero(c.Evict())
f, err = os.CreateTemp(d, "")
if err != nil {
t.Error(err)
}
c.Put(f.Name(), f)
Assert.EqualValues(1, c.Resize(0))
close(errC)
<-exit
}
func TestCache_Client(t *testing.T) {
Assert := assert.New(t)
ctx, cancel := context.WithCancel(context.Background())
capacity := 5
concurrency := 1
ca := New[int, int](ctx, capacity, concurrency)
defer ca.Wait()
defer cancel()
c := ca.Client(0)
Assert.EqualValues(5, c.Meta().Cap)
c.Put(1, 1)
c.Put(2, 2)
c.Put(42, 42)
c.Put(3, 3)
c.Get(42)
c.Put(314, 314)
vals := []int{314, 42, 3, 2, 1}
Assert.EqualValues(5, c.Meta().Len)
i := 0
c.Each(func(k, v int) {
Assert.EqualValues(vals[i], v)
i++
})
evicted := c.EvictTo(0)
Assert.EqualValues(5, evicted)
Assert.EqualValues(0, c.Meta().Len)
Assert.EqualValues(5, c.Meta().Cap)
c.Put(1, 1)
c.Put(2, 2)
c.Put(42, 42)
c.Put(3, 3)
c.Get(42)
c.Put(314, 314)
evicted = c.Resize(2)
Assert.EqualValues(3, evicted)
Assert.EqualValues(2, c.Meta().Len)
Assert.EqualValues(2, c.Meta().Cap)
vals = []int{314, 42}
i = 0
c.Each(func(k, v int) {
Assert.EqualValues(vals[i], v)
i++
})
}
func TestCache_Memory(t *testing.T) {
Assert := assert.New(t)
ctx, cancel := context.WithCancel(context.Background())
capacity := 5
concurrency := 1
c := New[int, int](ctx, capacity, concurrency)
defer c.Wait()
defer cancel()
c.Put(1, 1)
c.Put(42, 42)
c.Put(314159, 314159)
iSize := int(unsafe.Sizeof(0))
s := iSize * 3 * 2
s += iSize * 3
s += int(unsafe.Sizeof(&list.Node[int]{})) * 3
s += int(unsafe.Sizeof(KVPair[int, int]{0, 0})) * 3
Assert.EqualValues(s, c.Memory())
}
type TestStruct struct {
I int
S string
T *TestStruct
}
func TestCache_Memory_Struct(t *testing.T) {
Assert := assert.New(t)
ctx, cancel := context.WithCancel(context.Background())
capacity := 5
concurrency := 1
c := New[int, TestStruct](ctx, capacity, concurrency)
defer c.Wait()
defer cancel()
c.Put(1, TestStruct{1, "", &TestStruct{2, "", nil}})
c.Put(42, TestStruct{1, "", nil})
c.Put(314159, TestStruct{1, "hello", nil})
iSize := int(unsafe.Sizeof(0))
s := iSize * 3 * 2
s += int(unsafe.Sizeof(TestStruct{})) * 3
s += int(unsafe.Sizeof(&list.Node[TestStruct]{})) * 3
s += int(unsafe.Sizeof(KVPair[int, TestStruct]{0, TestStruct{}})) * 3
Assert.EqualValues(s, c.Memory())
}