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kvs.go
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kvs.go
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// Copyright (c) 2023 The Go-Enjin Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kvs
import (
"bytes"
"encoding/gob"
"github.com/go-corelibs/maths"
"github.com/go-enjin/be/pkg/feature"
)
type typedNil struct {
IS string
}
var (
gNilValue = typedNil{IS: "nil"}
gNilBytes = "\x1c\x7f\x03\x01\x01\btypedNil\x01\xff\x80\x00\x01\x01\x01\x02IS\x01\f\x00\x00\x00\b\xff\x80\x01\x03nil\x00"
)
type Variables interface {
maths.Number | byte | string
}
func IsSet(store feature.KeyValueStore, key string) (present bool) {
if v, err := store.Get(key); err == nil {
present = len(v) > 0 && string(v) != gNilBytes
}
return
}
func Marshal(value interface{}) (data []byte, err error) {
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
if err = enc.Encode(value); err != nil {
return
}
data = buf.Bytes()
return
}
func SetMarshal(store feature.KeyValueStore, key string, value interface{}) (err error) {
var data []byte
if data, err = Marshal(value); err != nil {
return
}
err = store.Set(key, data)
return
}
func Unmarshal[T interface{}](data []byte, value *T) (err error) {
dec := gob.NewDecoder(bytes.NewBuffer(data))
err = dec.Decode(value)
return
}
func GetUnmarshal[T interface{}](store feature.KeyValueStore, key string, value *T) (err error) {
var data []byte
if data, err = store.Get(key); err != nil {
return
}
err = Unmarshal(data, value)
return
}
func GetValue[T interface{}](store feature.KeyValueStore, key string) (value T) {
_ = GetUnmarshal(store, key, &value)
return
}
func AddToNumber[T maths.Number](store feature.KeyValueStore, key string, increment T) (updated T, err error) {
var current T
_ = GetUnmarshal(store, key, ¤t)
err = SetMarshal(store, key, current+increment)
return
}
func GetIsNil(store feature.KeyValueStore, key string) (isNil bool) {
var tnv typedNil
if e := GetUnmarshal(store, key, &tnv); e == nil {
isNil = tnv == gNilValue
}
return
}