Supporting reconnecting to /exec socket (#434)

internal/execstream/frame.go

@@ -10,18 +10,24 @@ import (
 type FrameType string
 
 const (
-	FrameTypeStdin  FrameType = "stdin"
-	FrameTypeStdout FrameType = "stdout"
-	FrameTypeStderr FrameType = "stderr"
-	FrameTypeExit   FrameType = "exit"
-	FrameTypeError  FrameType = "error"
+	FrameTypeStdin         FrameType = "stdin"
+	FrameTypeStdout        FrameType = "stdout"
+	FrameTypeStderr        FrameType = "stderr"
+	FrameTypeExit          FrameType = "exit"
+	FrameTypeError         FrameType = "error"
+	FrameTypeHistory       FrameType = "history"
+	FrameTypeNoMoreHistory FrameType = "no_more_history"
+	FrameTypeAck           FrameType = "ack"
+	FrameTypeDetach        FrameType = "detach"
+	FrameTypeClose         FrameType = "close"
 )
 
 type Frame struct {
-	Type  FrameType `json:"type"`
-	Data  []byte    `json:"data,omitempty"`
-	Exit  *Exit     `json:"exit,omitempty"`
-	Error string    `json:"error,omitempty"`
+	Type      FrameType `json:"type"`
+	Data      []byte    `json:"data,omitempty"`
+	Exit      *Exit     `json:"exit,omitempty"`
+	Error     string    `json:"error,omitempty"`
+	Watermark uint64    `json:"watermark,omitempty"`
 }
 
 type Exit struct {

internal/execstream/frame_test.go

@@ -0,0 +1,23 @@
+package execstream
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFrameRoundTripsWatermark(t *testing.T) {
+	frame := Frame{
+		Type:      FrameTypeHistory,
+		Watermark: 42,
+	}
+
+	payload, err := json.Marshal(frame)
+	require.NoError(t, err)
+
+	var decoded Frame
+	err = json.Unmarshal(payload, &decoded)
+	require.NoError(t, err)
+	require.Equal(t, frame, decoded)
+}