update: limit logBrief http body size (#3498)

Co-authored-by: 常公征 <changgz@yealink.com>

core/iox/read.go

@@ -28,6 +28,16 @@ func DupReadCloser(reader io.ReadCloser) (io.ReadCloser, io.ReadCloser) {
 	return io.NopCloser(tee), io.NopCloser(&buf)
 }
 
+// LimitDupReadCloser returns two io.ReadCloser that read from the first will be written to the second.
+// But the second io.ReadCloser is limited to up to n bytes.
+// The first returned reader needs to be read first, because the content
+// read from it will be written to the underlying buffer of the second reader.
+func LimitDupReadCloser(reader io.ReadCloser, n int64) (io.ReadCloser, io.ReadCloser) {
+	var buf bytes.Buffer
+	tee := LimitTeeReader(reader, &buf, n)
+	return io.NopCloser(tee), io.NopCloser(&buf)
+}
+
 // KeepSpace customizes the reading functions to keep leading and tailing spaces.
 func KeepSpace() TextReadOption {
 	return func(o *textReadOptions) {