micro/store/cache/cache_test.go
2020-04-11 12:10:19 +01:00

97 lines
3.3 KiB
Go

package cache
import (
"sort"
"testing"
"github.com/micro/go-micro/v2/store"
"github.com/micro/go-micro/v2/store/memory"
"github.com/stretchr/testify/assert"
)
func TestCache(t *testing.T) {
l0, l1, l2 := memory.NewStore(store.Database("l0")), memory.NewStore(store.Table("l1")), memory.NewStore()
_, _, _ = l0.Init(), l1.Init(), l2.Init()
assert := assert.New(t)
nonCache := NewCache(nil)
assert.Equal(len(nonCache.(*cache).stores), 1, "Expected a cache initialised with just 1 store to fail")
// Basic functionality
cachedStore := NewCache(l0, l1, l2)
assert.Equal(cachedStore.Options(), l0.Options(), "Options on store/cache are nonsensical")
expectedString := "cache [memory memory memory]"
assert.Equal(cachedStore.String(), expectedString, "Cache couldn't describe itself as expected")
// Read/Write tests
_, err := cachedStore.Read("test")
assert.Equal(store.ErrNotFound, err, "Read non existant key")
r1 := &store.Record{
Key: "aaa",
Value: []byte("bbb"),
}
r2 := &store.Record{
Key: "aaaa",
Value: []byte("bbbb"),
}
r3 := &store.Record{
Key: "aaaaa",
Value: []byte("bbbbb"),
}
// Write 3 records directly to l2
l2.Write(r1)
l2.Write(r2)
l2.Write(r3)
// Ensure it's not in l0
assert.Equal(store.ErrNotFound, func() error { _, err := l0.Read(r1.Key); return err }())
// Read from cache, ensure it's in all 3 stores
results, err := cachedStore.Read(r1.Key)
assert.Nil(err, "cachedStore.Read() returned error")
assert.Len(results, 1, "cachedStore.Read() should only return 1 result")
assert.Equal(r1, results[0], "Cached read didn't return the record that was put in")
results, err = l0.Read(r1.Key)
assert.Nil(err)
assert.Equal(r1, results[0], "l0 not coherent")
results, err = l1.Read(r1.Key)
assert.Nil(err)
assert.Equal(r1, results[0], "l1 not coherent")
results, err = l2.Read(r1.Key)
assert.Nil(err)
assert.Equal(r1, results[0], "l2 not coherent")
// Multiple read
results, err = cachedStore.Read("aa", store.ReadPrefix())
assert.Nil(err, "Cachedstore multiple read errored")
assert.Len(results, 3, "ReadPrefix should have read all records")
// l1 should now have all 3 records
l1results, err := l1.Read("aa", store.ReadPrefix())
assert.Nil(err, "l1.Read failed")
assert.Len(l1results, 3, "l1 didn't contain a full cache")
sort.Slice(results, func(i, j int) bool { return results[i].Key < results[j].Key })
sort.Slice(l1results, func(i, j int) bool { return l1results[i].Key < l1results[j].Key })
assert.Equal(results[0], l1results[0], "l1 cache not coherent")
assert.Equal(results[1], l1results[1], "l1 cache not coherent")
assert.Equal(results[2], l1results[2], "l1 cache not coherent")
// Test List and Delete
keys, err := cachedStore.List(store.ListPrefix("a"))
assert.Nil(err, "List should not error")
assert.Len(keys, 3, "List should return 3 keys")
for _, k := range keys {
err := cachedStore.Delete(k)
assert.Nil(err, "Delete should not error")
_, err = cachedStore.Read(k)
// N.B. - this may not pass on stores that are eventually consistent
assert.Equal(store.ErrNotFound, err, "record should be gone")
}
// Test Write
err = cachedStore.Write(r1)
assert.Nil(err, "Write shouldn't fail")
l2result, err := l2.Read(r1.Key)
assert.Nil(err)
assert.Len(l2result, 1)
assert.Equal(r1, l2result[0], "Write didn't make it all the way through to l2")
}