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cache_test.go
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cache_test.go
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package cache
import (
"bytes"
"io/ioutil"
"runtime"
"strconv"
"sync"
"testing"
"time"
)
type TestStruct struct {
Num int
Children []*TestStruct
}
func TestCache(t *testing.T) {
tc := New(0, 0)
a, found := tc.Get("a")
if found || a != nil {
t.Error("Getting A found value that shouldn't exist:", a)
}
b, found := tc.Get("b")
if found || b != nil {
t.Error("Getting B found value that shouldn't exist:", b)
}
c, found := tc.Get("c")
if found || c != nil {
t.Error("Getting C found value that shouldn't exist:", c)
}
tc.Set("a", 1, 0)
tc.Set("b", "b", 0)
tc.Set("c", 3.5, 0)
x, found := tc.Get("a")
if !found {
t.Error("a was not found while getting a2")
}
if x == nil {
t.Error("x for a is nil")
} else if a2 := x.(int); a2+2 != 3 {
t.Error("a2 (which should be 1) plus 2 does not equal 3; value:", a2)
}
x, found = tc.Get("b")
if !found {
t.Error("b was not found while getting b2")
}
if x == nil {
t.Error("x for b is nil")
} else if b2 := x.(string); b2+"B" != "bB" {
t.Error("b2 (which should be b) plus B does not equal bB; value:", b2)
}
x, found = tc.Get("c")
if !found {
t.Error("c was not found while getting c2")
}
if x == nil {
t.Error("x for c is nil")
} else if c2 := x.(float64); c2+1.2 != 4.7 {
t.Error("c2 (which should be 3.5) plus 1.2 does not equal 4.7; value:", c2)
}
}
func TestCacheTimes(t *testing.T) {
var found bool
tc := New(50*time.Millisecond, 1*time.Millisecond)
tc.Set("a", 1, 0)
tc.Set("b", 2, -1)
tc.Set("c", 3, 20*time.Millisecond)
tc.Set("d", 4, 70*time.Millisecond)
<-time.After(25 * time.Millisecond)
_, found = tc.Get("c")
if found {
t.Error("Found c when it should have been automatically deleted")
}
<-time.After(30 * time.Millisecond)
_, found = tc.Get("a")
if found {
t.Error("Found a when it should have been automatically deleted")
}
_, found = tc.Get("b")
if !found {
t.Error("Did not find b even though it was set to never expire")
}
_, found = tc.Get("d")
if !found {
t.Error("Did not find d even though it was set to expire later than the default")
}
<-time.After(20 * time.Millisecond)
_, found = tc.Get("d")
if found {
t.Error("Found d when it should have been automatically deleted (later than the default)")
}
}
func TestStorePointerToStruct(t *testing.T) {
tc := New(0, 0)
tc.Set("foo", &TestStruct{Num: 1}, 0)
x, found := tc.Get("foo")
if !found {
t.Fatal("*TestStruct was not found for foo")
}
foo := x.(*TestStruct)
foo.Num++
y, found := tc.Get("foo")
if !found {
t.Fatal("*TestStruct was not found for foo (second time)")
}
bar := y.(*TestStruct)
if bar.Num != 2 {
t.Fatal("TestStruct.Num is not 2")
}
}
func TestIncrementUint(t *testing.T) {
tc := New(0, 0)
tc.Set("tuint", uint(1), 0)
_, err := tc.Increment("tuint", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tuint")
if !found {
t.Error("tuint was not found")
}
if x.(uint) != 3 {
t.Error("tuint is not 3:", x)
}
}
func TestIncrementUintptr(t *testing.T) {
tc := New(0, 0)
tc.Set("tuintptr", uintptr(1), 0)
_, err := tc.Increment("tuintptr", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tuintptr")
if !found {
t.Error("tuintptr was not found")
}
if x.(uintptr) != 3 {
t.Error("tuintptr is not 3:", x)
}
}
func TestIncrementUint8(t *testing.T) {
tc := New(0, 0)
tc.Set("tuint8", uint8(1), 0)
_, err := tc.Increment("tuint8", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tuint8")
if !found {
t.Error("tuint8 was not found")
}
if x.(uint8) != 3 {
t.Error("tuint8 is not 3:", x)
}
}
func TestIncrementUint16(t *testing.T) {
tc := New(0, 0)
tc.Set("tuint16", uint16(1), 0)
_, err := tc.Increment("tuint16", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tuint16")
if !found {
t.Error("tuint16 was not found")
}
if x.(uint16) != 3 {
t.Error("tuint16 is not 3:", x)
}
}
func TestIncrementUint32(t *testing.T) {
tc := New(0, 0)
tc.Set("tuint32", uint32(1), 0)
_, err := tc.Increment("tuint32", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tuint32")
if !found {
t.Error("tuint32 was not found")
}
if x.(uint32) != 3 {
t.Error("tuint32 is not 3:", x)
}
}
func TestIncrementUint64(t *testing.T) {
tc := New(0, 0)
tc.Set("tuint64", uint64(1), 0)
_, err := tc.Increment("tuint64", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tuint64")
if !found {
t.Error("tuint64 was not found")
}
if x.(uint64) != 3 {
t.Error("tuint64 is not 3:", x)
}
}
func TestIncrementInt(t *testing.T) {
tc := New(0, 0)
tc.Set("tint", 1, 0)
_, err := tc.Increment("tint", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tint")
if !found {
t.Error("tint was not found")
}
if x.(int) != 3 {
t.Error("tint is not 3:", x)
}
}
func TestIncrementInt8(t *testing.T) {
tc := New(0, 0)
tc.Set("tint8", int8(1), 0)
_, err := tc.Increment("tint8", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tint8")
if !found {
t.Error("tint8 was not found")
}
if x.(int8) != 3 {
t.Error("tint8 is not 3:", x)
}
}
func TestIncrementInt16(t *testing.T) {
tc := New(0, 0)
tc.Set("tint16", int16(1), 0)
_, err := tc.Increment("tint16", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tint16")
if !found {
t.Error("tint16 was not found")
}
if x.(int16) != 3 {
t.Error("tint16 is not 3:", x)
}
}
func TestIncrementInt32(t *testing.T) {
tc := New(0, 0)
tc.Set("tint32", int32(1), 0)
_, err := tc.Increment("tint32", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tint32")
if !found {
t.Error("tint32 was not found")
}
if x.(int32) != 3 {
t.Error("tint32 is not 3:", x)
}
}
func TestIncrementInt64(t *testing.T) {
tc := New(0, 0)
tc.Set("tint64", int64(1), 0)
_, err := tc.Increment("tint64", 2)
if err != nil {
t.Error("Error incrementing:", err)
}
x, found := tc.Get("tint64")
if !found {
t.Error("tint64 was not found")
}
if x.(int64) != 3 {
t.Error("tint64 is not 3:", x)
}
}
func TestDecrementInt64(t *testing.T) {
tc := New(0, 0)
tc.Set("int64", int64(5), 0)
_, err := tc.Decrement("int64", 2)
if err != nil {
t.Error("Error decrementing:", err)
}
x, found := tc.Get("int64")
if !found {
t.Error("int64 was not found")
}
if x.(int64) != 3 {
t.Error("int64 is not 3:", x)
}
}
func TestAdd(t *testing.T) {
tc := New(0, 0)
err := tc.Add("foo", "bar", 0)
if err != nil {
t.Error("Couldn't add foo even though it shouldn't exist")
}
err = tc.Add("foo", "baz", 0)
if err == nil {
t.Error("Successfully added another foo when it should have returned an error")
}
}
func TestReplace(t *testing.T) {
tc := New(0, 0)
err := tc.Replace("foo", "bar", 0)
if err == nil {
t.Error("Replaced foo when it shouldn't exist")
}
tc.Set("foo", "bar", 0)
err = tc.Replace("foo", "bar", 0)
if err != nil {
t.Error("Couldn't replace existing key foo")
}
}
func TestDelete(t *testing.T) {
tc := New(0, 0)
tc.Set("foo", "bar", 0)
tc.Delete("foo")
x, found := tc.Get("foo")
if found {
t.Error("foo was found, but it should have been deleted")
}
if x != nil {
t.Error("x is not nil:", x)
}
}
func TestFlush(t *testing.T) {
tc := New(0, 0)
tc.Set("foo", "bar", 0)
tc.Set("baz", "yes", 0)
tc.Flush()
x, found := tc.Get("foo")
if found {
t.Error("foo was found, but it should have been deleted")
}
if x != nil {
t.Error("x is not nil:", x)
}
x, found = tc.Get("baz")
if found {
t.Error("baz was found, but it should have been deleted")
}
if x != nil {
t.Error("x is not nil:", x)
}
}
func TestIncrementOverflowInt(t *testing.T) {
tc := New(0, 0)
tc.Set("int8", int8(127), 0)
_, err := tc.Increment("int8", 1)
if err != nil {
t.Error("Error incrementing int8:", err)
}
x, _ := tc.Get("int8")
int8 := x.(int8)
if int8 != -128 {
t.Error("int8 did not overflow as expected; value:", int8)
}
}
func TestIncrementOverflowUint(t *testing.T) {
tc := New(0, 0)
tc.Set("uint8", uint8(255), 0)
_, err := tc.Increment("uint8", 1)
if err != nil {
t.Error("Error incrementing int8:", err)
}
x, _ := tc.Get("uint8")
uint8 := x.(uint8)
if uint8 != 0 {
t.Error("uint8 did not overflow as expected; value:", uint8)
}
}
func TestDecrementUnderflowUint(t *testing.T) {
tc := New(0, 0)
tc.Set("uint8", uint8(0), 0)
_, err := tc.Decrement("uint8", 1)
if err != nil {
t.Error("Error decrementing int8:", err)
}
x, _ := tc.Get("uint8")
uint8 := x.(uint8)
if uint8 != 0 {
t.Error("uint8 was not capped at 0; value:", uint8)
}
}
func TestCacheSerialization(t *testing.T) {
tc := New(0, 0)
testFillAndSerialize(t, tc)
// Check if gob.Register behaves properly even after multiple gob.Register
// on c.Items (many of which will be the same type)
testFillAndSerialize(t, tc)
}
func testFillAndSerialize(t *testing.T, tc *Cache) {
tc.Set("a", "a", 0)
tc.Set("b", "b", 0)
tc.Set("c", "c", 0)
tc.Set("expired", "foo", 1*time.Millisecond)
tc.Set("*struct", &TestStruct{Num: 1}, 0)
tc.Set("[]struct", []TestStruct{
{Num: 2},
{Num: 3},
}, 0)
tc.Set("[]*struct", []*TestStruct{
&TestStruct{Num: 4},
&TestStruct{Num: 5},
}, 0)
tc.Set("structception", &TestStruct{
Num: 42,
Children: []*TestStruct{
&TestStruct{Num: 6174},
&TestStruct{Num: 4716},
},
}, 0)
fp := &bytes.Buffer{}
err := tc.Save(fp)
if err != nil {
t.Fatal("Couldn't save cache to fp:", err)
}
oc := New(0, 0)
err = oc.Load(fp)
if err != nil {
t.Fatal("Couldn't load cache from fp:", err)
}
a, found := oc.Get("a")
if !found {
t.Error("a was not found")
}
if a.(string) != "a" {
t.Error("a is not a")
}
b, found := oc.Get("b")
if !found {
t.Error("b was not found")
}
if b.(string) != "b" {
t.Error("b is not b")
}
c, found := oc.Get("c")
if !found {
t.Error("c was not found")
}
if c.(string) != "c" {
t.Error("c is not c")
}
<-time.After(5 * time.Millisecond)
_, found = oc.Get("expired")
if found {
t.Error("expired was found")
}
s1, found := oc.Get("*struct")
if !found {
t.Error("*struct was not found")
}
if s1.(*TestStruct).Num != 1 {
t.Error("*struct.Num is not 1")
}
s2, found := oc.Get("[]struct")
if !found {
t.Error("[]struct was not found")
}
s2r := s2.([]TestStruct)
if len(s2r) != 2 {
t.Error("Length of s2r is not 2")
}
if s2r[0].Num != 2 {
t.Error("s2r[0].Num is not 2")
}
if s2r[1].Num != 3 {
t.Error("s2r[1].Num is not 3")
}
s3, found := oc.get("[]*struct")
if !found {
t.Error("[]*struct was not found")
}
s3r := s3.([]*TestStruct)
if len(s3r) != 2 {
t.Error("Length of s3r is not 2")
}
if s3r[0].Num != 4 {
t.Error("s3r[0].Num is not 4")
}
if s3r[1].Num != 5 {
t.Error("s3r[1].Num is not 5")
}
s4, found := oc.get("structception")
if !found {
t.Error("structception was not found")
}
s4r := s4.(*TestStruct)
if len(s4r.Children) != 2 {
t.Error("Length of s4r.Children is not 2")
}
if s4r.Children[0].Num != 6174 {
t.Error("s4r.Children[0].Num is not 6174")
}
if s4r.Children[1].Num != 4716 {
t.Error("s4r.Children[1].Num is not 4716")
}
}
func TestFileSerialization(t *testing.T) {
tc := New(0, 0)
tc.Add("a", "a", 0)
tc.Add("b", "b", 0)
f, err := ioutil.TempFile("", "go-cache-cache.dat")
if err != nil {
t.Fatal("Couldn't create cache file:", err)
}
fname := f.Name()
f.Close()
tc.SaveFile(fname)
oc := New(0, 0)
oc.Add("a", "aa", 0) // this should not be overwritten
err = oc.LoadFile(fname)
if err != nil {
t.Error(err)
}
a, found := oc.Get("a")
if !found {
t.Error("a was not found")
}
astr := a.(string)
if astr != "aa" {
if astr == "a" {
t.Error("a was overwritten")
} else {
t.Error("a is not aa")
}
}
b, found := oc.Get("b")
if !found {
t.Error("b was not found")
}
if b.(string) != "b" {
t.Error("b is not b")
}
}
func TestSerializeUnserializable(t *testing.T) {
tc := New(0, 0)
ch := make(chan bool, 1)
ch <- true
tc.Set("chan", ch, 0)
fp := &bytes.Buffer{}
err := tc.Save(fp) // this should fail gracefully
if err.Error() != "gob NewTypeObject can't handle type: chan bool" {
t.Error("Error from Save was not gob NewTypeObject can't handle type chan bool:", err)
}
}
func BenchmarkCacheGet(b *testing.B) {
b.StopTimer()
tc := New(0, 0)
tc.Set("foo", "bar", 0)
b.StartTimer()
for i := 0; i < b.N; i++ {
tc.Get("foo")
}
}
func BenchmarkMutexMapGet(b *testing.B) {
b.StopTimer()
m := map[string]string{
"foo": "bar",
}
mu := sync.Mutex{}
b.StartTimer()
for i := 0; i < b.N; i++ {
mu.Lock()
_, _ = m["foo"]
mu.Unlock()
}
}
func BenchmarkCacheGetConcurrent(b *testing.B) {
b.StopTimer()
tc := New(0, 0)
tc.Set("foo", "bar", 0)
wg := new(sync.WaitGroup)
workers := runtime.NumCPU()
each := b.N / workers
wg.Add(workers)
b.StartTimer()
for i := 0; i < workers; i++ {
go func() {
for j := 0; j < each; j++ {
tc.Get("foo")
}
wg.Done()
}()
}
wg.Wait()
}
func BenchmarkMutexMapGetConcurrent(b *testing.B) {
b.StopTimer()
m := map[string]string{
"foo": "bar",
}
mu := sync.Mutex{}
wg := new(sync.WaitGroup)
workers := runtime.NumCPU()
each := b.N / workers
wg.Add(workers)
b.StartTimer()
for i := 0; i < workers; i++ {
go func() {
for j := 0; j < each; j++ {
mu.Lock()
_, _ = m["foo"]
mu.Unlock()
}
wg.Done()
}()
}
wg.Wait()
}
func BenchmarkCacheGetManyConcurrent(b *testing.B) {
// This is the same as BenchmarkCacheGetConcurrent, but its result
// can be compared against BenchmarkShardedCacheGetManyConcurrent.
b.StopTimer()
n := 10000
tc := New(0, 0)
keys := make([]string, n)
for i := 0; i < n; i++ {
k := "foo" + strconv.Itoa(n)
keys[i] = k
tc.Set(k, "bar", 0)
}
each := b.N / n
wg := new(sync.WaitGroup)
wg.Add(n)
for _, v := range keys {
go func() {
for j := 0; j < each; j++ {
tc.Get(v)
}
wg.Done()
}()
}
b.StartTimer()
wg.Wait()
}
func BenchmarkShardedCacheGetManyConcurrent(b *testing.B) {
b.StopTimer()
n := 10000
tsc := unexportedNewSharded(20, 0, 0)
keys := make([]string, n)
for i := 0; i < n; i++ {
k := "foo" + strconv.Itoa(n)
keys[i] = k
tsc.Set(k, "bar", 0)
}
each := b.N / n
wg := new(sync.WaitGroup)
wg.Add(n)
for _, v := range keys {
go func() {
for j := 0; j < each; j++ {
tsc.Get(v)
}
wg.Done()
}()
}
b.StartTimer()
wg.Wait()
}
func BenchmarkCacheSet(b *testing.B) {
b.StopTimer()
tc := New(0, 0)
b.StartTimer()
for i := 0; i < b.N; i++ {
tc.Set("foo", "bar", 0)
}
}
func BenchmarkMutexMapSet(b *testing.B) {
b.StopTimer()
m := map[string]string{}
mu := sync.Mutex{}
b.StartTimer()
for i := 0; i < b.N; i++ {
mu.Lock()
m["foo"] = "bar"
mu.Unlock()
}
}
func BenchmarkCacheSetDelete(b *testing.B) {
b.StopTimer()
tc := New(0, 0)
b.StartTimer()
for i := 0; i < b.N; i++ {
tc.Set("foo", "bar", 0)
tc.Delete("foo")
}
}
func BenchmarkMutexMapSetDelete(b *testing.B) {
b.StopTimer()
m := map[string]string{}
mu := sync.Mutex{}
b.StartTimer()
for i := 0; i < b.N; i++ {
mu.Lock()
m["foo"] = "bar"
mu.Unlock()
mu.Lock()
delete(m, "foo")
mu.Unlock()
}
}
func BenchmarkCacheSetDeleteSingleLock(b *testing.B) {
b.StopTimer()
tc := New(0, 0)
b.StartTimer()
for i := 0; i < b.N; i++ {
tc.Lock()
tc.set("foo", "bar", 0)
tc.delete("foo")
tc.Unlock()
}
}
func BenchmarkMutexMapSetDeleteSingleLock(b *testing.B) {
b.StopTimer()
m := map[string]string{}
mu := sync.Mutex{}
b.StartTimer()
for i := 0; i < b.N; i++ {
mu.Lock()
m["foo"] = "bar"
delete(m, "foo")
mu.Unlock()
}
}