add http body for handler recorder

internal/net/http/http.go

@@ -1,6 +1,8 @@
 package http
 
 import (
+	"bytes"
+	"io"
 	"net"
 	"net/http"
 	"strings"
@@ -24,3 +26,47 @@ func GetClientIP(req *http.Request) net.IP {
 
 	return net.ParseIP(sip)
 }
+
+type Body struct {
+	r          io.ReadCloser
+	buf        bytes.Buffer
+	length     int64
+	recordSize int
+}
+
+func NewBody(r io.ReadCloser, maxRecordSize int) *Body {
+	p := &Body{
+		r:          r,
+		recordSize: maxRecordSize,
+	}
+
+	return p
+}
+
+func (p *Body) Read(b []byte) (n int, err error) {
+	n, err = p.r.Read(b)
+	p.length += int64(n)
+
+	if p.recordSize > 0 {
+		b = b[:n]
+		if n > p.recordSize {
+			b = b[:p.recordSize]
+		}
+		p.buf.Write(b)
+		p.recordSize -= n
+	}
+
+	return
+}
+
+func (p *Body) Close() error {
+	return p.r.Close()
+}
+
+func (p *Body) Content() []byte {
+	return p.buf.Bytes()
+}
+
+func (p *Body) Length() int64 {
+	return p.length
+}