feat: Add migrate (#1419)

* Add migrate

* Remove unused module

* refactor filename

* rename refactor to migrate

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/migrate/version.go

@@ -0,0 +1,47 @@
+package migrate
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/tal-tech/go-zero/tools/goctl/util/console"
+)
+
+var client = http.Client{
+	Timeout: 5 * time.Second,
+}
+
+func getLatest(repo string, verbose bool) ([]string, error) {
+	proxies := goProxy()
+	for _, proxy := range proxies {
+		if verbose {
+			console.Info("use go proxy %q", proxy)
+		}
+		log := func(err error) {
+			console.Warning("get latest versions failed from proxy %q, error: %+v", proxy, err)
+		}
+		resp, err := client.Get(fmt.Sprintf("%s/%s/@v/list", proxy, repo))
+		if err != nil {
+			log(err)
+			continue
+		}
+
+		if resp.StatusCode != http.StatusOK {
+			log(fmt.Errorf("%s", resp.Status))
+			continue
+		}
+		defer resp.Body.Close()
+		data, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			log(err)
+			continue
+		}
+		versionStr := string(data)
+		versions := strings.Fields(versionStr)
+		return versions, nil
+	}
+	return []string{}, nil
+}