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add comment for frame operation #3

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10 changes: 6 additions & 4 deletions column/timegeek/go-first-course/37/tcp-server-demo1/frame/frame.go
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Original file line number Diff line number Diff line change
Expand Up @@ -36,13 +36,15 @@ func NewMyFrameCodec() StreamFrameCodec {

func (p *myFrameCodec) Encode(w io.Writer, framePayload FramePayload) error {
var f = framePayload
var totalLen int32 = int32(len(framePayload)) + 4
var totalLen int32 = int32(len(framePayload)) + 4 // 4对应Frame中totalLength的4个字节。总长度 = payload字节长度+totalLength的字节长度

// 先在frame中写上totalLength
err := binary.Write(w, binary.BigEndian, &totalLen)
if err != nil {
return err
}

// 再在frame中写上payload
n, err := w.Write([]byte(f)) // write the frame payload to outbound stream
if err != nil {
return err
Expand All @@ -55,13 +57,13 @@ func (p *myFrameCodec) Encode(w io.Writer, framePayload FramePayload) error {
}

func (p *myFrameCodec) Decode(r io.Reader) (FramePayload, error) {
var totalLen int32
err := binary.Read(r, binary.BigEndian, &totalLen)
var totalLen int32 // int32为4个字节，对应了frame中totalLength的4个字节
err := binary.Read(r, binary.BigEndian, &totalLen) // 先从frame中读出前面的4个字节，该4个字节为frame中的totalLength
if err != nil {
return nil, err
}

buf := make([]byte, totalLen-4)
buf := make([]byte, totalLen-4) // 再从frame中读出totalLength以后的剩下的字节，这些剩下的字节为payload
n, err := io.ReadFull(r, buf)
if err != nil {
return nil, err
Expand Down