stream/mts/meta.go: completed Meta.Encode() function

stream/mts/meta.go

@@ -32,6 +32,13 @@ import (
 	"sync"
 )
 
+const headSize = 4
+
+const (
+	majVer = 1
+	minVer = 0
+)
+
 var (
 	errKeyAbsent = errors.New("Key does not exist in map")
 )
@@ -39,10 +46,19 @@ var (
 type Meta struct {
 	mu   sync.RWMutex
 	data map[string]string
+	enc  []byte
 }
 
 func NewMeta() *Meta {
-	return &Meta{data: make(map[string]string)}
+	return &Meta{
+		data: make(map[string]string),
+		enc: []byte{
+			0x00,                   // Reserved byte
+			(majVer << 4) | minVer, // MS and LS versions
+			0x00,                   // Data len byte1
+			0x00,                   // Data len byte2
+		},
+	}
 }
 
 // Add adds metadata with key and val, if already exists return error
@@ -87,6 +103,12 @@ func (m *Meta) Delete(key string) error {
 }
 
 func (m *Meta) Encode() []byte {
-	// TODO: complete this
-	return []byte("someData")
+	m.enc = m.enc[:headSize]
+	for k, v := range m.data {
+		entry := k + "=" + v + "\t"
+		m.enc = append(m.enc, []byte(entry)...)
+	}
+	// Remove final tab
+	m.enc = m.enc[:len(m.enc)-1]
+	return m.enc
 }