pkg: add grpcutil package (#1032)

pkg/grpcutil/grpcutil_test.go

@@ -0,0 +1,29 @@
+package grpcutil
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc/metadata"
+)
+
+func TestWithOutgoingSessionID(t *testing.T) {
+	ctx := context.Background()
+	ctx = WithOutgoingSessionID(ctx, "EXAMPLE")
+	md, ok := metadata.FromOutgoingContext(ctx)
+	if !assert.True(t, ok) {
+		return
+	}
+	assert.Equal(t, []string{"EXAMPLE"}, md.Get("sessionid"))
+}
+
+func TestSessionIDFromGRPCRequest(t *testing.T) {
+	ctx := context.Background()
+	ctx = metadata.NewIncomingContext(ctx, metadata.MD{
+		"sessionid": {"EXAMPLE"},
+	})
+	sessionID, ok := SessionIDFromGRPCRequest(ctx)
+	assert.True(t, ok)
+	assert.Equal(t, "EXAMPLE", sessionID)
+}