add concept of framing to net.tcp

internals/framing/framer.go

@@ -0,0 +1,6 @@
+package framing
+
+type Framer interface {
+	Frame([]byte) [][]byte
+	Clear()
+}

internals/framing/separator.go

@@ -0,0 +1,33 @@
+package framing
+
+import (
+	"bytes"
+)
+
+type ByteSeparatorFramer struct {
+	buffer    []byte
+	separator []byte
+}
+
+func NewByteSeparatorFramer(separator []byte) *ByteSeparatorFramer {
+	return &ByteSeparatorFramer{separator: separator, buffer: []byte{}}
+}
+
+func (bsf *ByteSeparatorFramer) Frame(data []byte) [][]byte {
+	messages := [][]byte{}
+
+	bsf.buffer = append(bsf.buffer, data...)
+
+	parts := bytes.Split(bsf.buffer, bsf.separator)
+
+	if len(parts) > 0 {
+		bsf.buffer = parts[len(parts)-1]
+		messages = parts[:len(parts)-1]
+	}
+
+	return messages
+}
+
+func (bsf *ByteSeparatorFramer) Clear() {
+	bsf.buffer = []byte{}
+}