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encoder.go
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/
encoder.go
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package hacache
import (
"github.com/vmihailenco/msgpack/v5"
"google.golang.org/protobuf/proto"
)
// Encoder encoder of ha-cache
type Encoder interface {
Encode(v interface{}) ([]byte, error)
Decode(b []byte) (interface{}, error)
NewValue() interface{}
}
// HaEncoder default encoder of ha-cache
// 对于 protobuf message 使用 protobuf 序列化,其他 struct 使用 msgpack
type HaEncoder struct {
// 函数返回缓存中存的值类型,空值指针
// 用于将缓存中的值进行反序列化
NewValueFn func() interface{}
}
// NewEncoder return new ha-encoder
func NewEncoder(n func() interface{}) *HaEncoder {
return &HaEncoder{
NewValueFn: n,
}
}
// Encode encode v to bytes
func (enc *HaEncoder) Encode(v interface{}) ([]byte, error) {
switch msg := v.(type) {
case proto.Message:
return proto.Marshal(msg)
default:
return msgpack.Marshal(v)
}
}
// Decode decode bytes to interface
func (enc *HaEncoder) Decode(b []byte) (interface{}, error) {
v := enc.NewValue()
switch msg := v.(type) {
case proto.Message:
err := proto.Unmarshal(b, msg)
return msg, err
case int64:
err := msgpack.Unmarshal(b, &msg)
return msg, err
default:
err := msgpack.Unmarshal(b, &msg)
return msg, err
}
}
// NewValue return new empty encoder value
func (enc *HaEncoder) NewValue() interface{} {
return enc.NewValueFn()
}