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node_proto.go
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node_proto.go
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package proto
/**
* Proto for node
*/
import (
"encoding/binary"
"errors"
"io"
)
var (
ELENGTH_TO_LONG = errors.New("Request's Length is Bigger than Read Buffer!")
)
type NodeProto struct {
Proto
Magic uint8
Version uint8
CMD uint16
Seq uint32
AgentID uint32
Length uint32
headBuf [16]byte
readBuf []byte
}
func (np *NodeProto) Body() []byte {
return np.readBuf[:np.Length]
}
func (np *NodeProto) Init(buf []byte) {
np.readBuf = buf
np.Magic = MN_MAGIC
np.Version = MN_VERSION
}
func (np *NodeProto) RecvAndUnpack(rw io.ReadWriter) (err error) {
if rw == nil {
// TODO : add log here
//fmt.Println("rw is null")
}
len, err := io.ReadFull(rw, np.headBuf[:])
if err == io.EOF && len == 16 {
err = nil
}
if err != nil {
return
}
if len != cap(np.headBuf) {
return
}
np.Magic = np.headBuf[0]
np.Version = np.headBuf[1]
np.CMD = binary.BigEndian.Uint16(np.headBuf[2:4])
np.Seq = binary.BigEndian.Uint32(np.headBuf[4:8])
np.AgentID = binary.BigEndian.Uint32(np.headBuf[8:12])
np.Length = binary.BigEndian.Uint32(np.headBuf[12:16])
if np.Length > uint32(cap(np.readBuf)) {
err = ELENGTH_TO_LONG
return
}
//fmt.Println("Node:request cmd is %d, and body length %d", np.CMD, np.Length)
len, err = io.ReadFull(rw, np.readBuf[:np.Length])
if err == io.EOF && len == int(np.Length) {
err = nil
}
if err != nil {
return
}
return
}
func (np *NodeProto) PackAndSend(rw io.ReadWriter) (err error) {
np.headBuf[0] = np.Magic
np.headBuf[1] = np.Version
binary.BigEndian.PutUint16(np.headBuf[2:4], np.CMD)
binary.BigEndian.PutUint32(np.headBuf[4:8], np.Seq)
binary.BigEndian.PutUint32(np.headBuf[8:12], np.AgentID)
binary.BigEndian.PutUint32(np.headBuf[12:16], np.Length)
//print("response with rsp:", np.CMD)
rw.Write(np.headBuf[:])
rw.Write(np.Body())
return nil
}