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// Copyright (c) 2012-2016 The Revel Framework Authors, All rights reserved.
// Revel Framework source code and usage is governed by a MIT style
// license that can be found in the LICENSE file.
package cache
import (
"bytes"
"encoding/gob"
"reflect"
"strconv"
)
// Serialize transforms the given value into bytes following these rules:
// - If value is a byte array, it is returned as-is.
// - If value is an int or uint type, it is returned as the ASCII representation
// - Else, encoding/gob is used to serialize
func Serialize(value interface{}) ([]byte, error) {
if data, ok := value.([]byte); ok {
return data, nil
}
switch v := reflect.ValueOf(value); v.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return []byte(strconv.FormatInt(v.Int(), 10)), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return []byte(strconv.FormatUint(v.Uint(), 10)), nil
}
var b bytes.Buffer
encoder := gob.NewEncoder(&b)
if err := encoder.Encode(value); err != nil {
cacheLog.Error("Serialize: gob encoding failed", "value", value, "error", err)
return nil, err
}
return b.Bytes(), nil
}
// Deserialize transforms bytes produced by Serialize back into a Go object,
// storing it into "ptr", which must be a pointer to the value type.
func Deserialize(byt []byte, ptr interface{}) (err error) {
if data, ok := ptr.(*[]byte); ok {
*data = byt
return
}
if v := reflect.ValueOf(ptr); v.Kind() == reflect.Ptr {
switch p := v.Elem(); p.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
var i int64
i, err = strconv.ParseInt(string(byt), 10, 64)
if err != nil {
cacheLog.Error("Deserialize: failed to parse int", "value", string(byt), "error", err)
} else {
p.SetInt(i)
}
return
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
var i uint64
i, err = strconv.ParseUint(string(byt), 10, 64)
if err != nil {
cacheLog.Error("Deserialize: failed to parse uint", "value", string(byt), "error", err)
} else {
p.SetUint(i)
}
return
}
}
b := bytes.NewBuffer(byt)
decoder := gob.NewDecoder(b)
if err = decoder.Decode(ptr); err != nil {
cacheLog.Error("Deserialize: glob decoding failed", "error", err)
return
}
return
}
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