nats migration

ver/lib.go

@@ -0,0 +1,26 @@
+package ver
+
+import (
+	"golang.org/x/mod/semver"
+	"log"
+	"os"
+)
+
+func EnsureVer(v string) {
+	build := os.Getenv("BUILD_VER")
+	if build == "" {
+		log.Printf("No BUILD_VER found - skipping verification")
+		return
+	}
+	if semver.Compare(build, v) < 0 {
+		log.Printf("Replay version is %s, lower than required. Should be minimum %s - aborting", build, v)
+		os.Exit(0)
+	}
+	if semver.Major(build) != semver.Major(v) {
+		log.Printf("Replay major version is %s, different from feature requirement:  %s - aborting", build, v)
+	}
+}
+func Get() string {
+	build := os.Getenv("BUILD_VER")
+	return build
+}