no message

cli/cmd/fetch.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"github.com/spf13/cobra"
+	"github.com/up9inc/mizu/cli/mizu"
 )
 
 type MizuFetchOptions struct {
@@ -17,6 +18,9 @@ var fetchCmd = &cobra.Command{
 	Use:   "fetch",
 	Short: "Download recorded traffic to files",
 	RunE: func(cmd *cobra.Command, args []string) error {
+		if !mizu.CheckVersionCompatibility(mizuFetchOptions.MizuPort) {
+			return nil
+		}
 		RunMizuFetch(&mizuFetchOptions)
 		return nil
 	},

cli/cmd/view.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"github.com/spf13/cobra"
+	"github.com/up9inc/mizu/cli/mizu"
 )
 
 type MizuViewOptions struct {
@@ -14,9 +15,14 @@ var viewCmd = &cobra.Command{
 	Use:   "view",
 	Short: "Open GUI in browser",
 	RunE: func(cmd *cobra.Command, args []string) error {
+
+		if !mizu.CheckVersionCompatibility(mizuFetchOptions.MizuPort) {
+			return nil
+		}
 		runMizuView(mizuViewOptions)
 		return nil
 	},
+
 }
 
 func init() {

cli/mizu/versionCheck.go

@@ -0,0 +1,40 @@
+package mizu
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/up9inc/mizu/shared"
+	"net/http"
+	"net/url"
+)
+
+
+func getApiVersion(port uint16) (string, error) {
+	versionUrl, _ := url.Parse(fmt.Sprintf("http://localhost:%d/mizu/metadata/version", port))
+	req := &http.Request{
+		Method: http.MethodGet,
+		URL:    versionUrl,
+	}
+	statusResp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer statusResp.Body.Close()
+
+	versionResponse := &shared.VersionResponse{}
+	_ = json.NewDecoder(statusResp.Body).Decode(&versionResponse)
+
+	return versionResponse.SemVer, nil
+}
+
+func CheckVersionCompatibility(port uint16) bool {
+	apiSemVer, err := getApiVersion(port)
+	if err != nil {
+		return true
+	}
+	if apiSemVer == SemVer {
+		return true
+	}
+	fmt.Printf(Red, fmt.Sprintf("cli version (%s) is not compatible with api version (%s)\n", SemVer, apiSemVer))
+	return false
+}