go-micro codec 编码

　　codec 用于各种信息的加解密，具体接口如下：

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// Codec encodes/decodes various types of messages used within go-micro. // ReadHeader and ReadBody are called in pairs to read requests/responses // from the connection. Close is called when finished with the // connection. ReadBody may be called with a nil argument to force the // body to be read and discarded. type Codec interface {     ReadHeader(*Message, MessageType) error     ReadBody(interface{}) error     Write(*Message, interface{}) error     Close() error     String() string }   // Message represents detailed information about // the communication, likely followed by the body. // In the case of an error, body may be nil. type Message struct {     Id     uint64     Type   MessageType     Target string     Method string     Error  string     Header map[string]string }

　　

　　读写接口处理；

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// WriteNetString writes data to a big-endian netstring on a Writer. // Size is always a 32-bit unsigned int. func WriteNetString(w io.Writer, data []byte) (written int, err error) {     size := make([]byte, 4)     binary.BigEndian.PutUint32(size, uint32(len(data)))     if written, err = w.Write(size); err != nil {         return     }     return w.Write(data) }   // ReadNetString reads data from a big-endian netstring. func ReadNetString(r io.Reader) (data []byte, err error) {     sizeBuf := make([]byte, 4)     _, err = r.Read(sizeBuf)     if err != nil {         return nil, err     }     size := binary.BigEndian.Uint32(sizeBuf)     if size == 0 {         return nil, nil     }     data = make([]byte, size)     _, err = r.Read(data)     if err != nil {         return nil, err     }     return }