#191: Handle memory issue caused by migration from Service to Endpoint

storage/store/memory/memory.go

@@ -2,7 +2,11 @@ package memory
 
 import (
 	"encoding/gob"
+	"io/fs"
+	"io/ioutil"
+	"log"
 	"sort"
+	"strings"
 	"sync"
 	"time"
 
@@ -40,6 +44,20 @@ func NewStore(file string) (*Store, error) {
 	if len(file) > 0 {
 		_, err := store.cache.ReadFromFile(file)
 		if err != nil {
+			// XXX: Remove the block below in v4.0.0
+			if data, err2 := ioutil.ReadFile(file); err2 == nil {
+				isFromOldVersion := strings.Contains(string(data), "*core.ServiceStatus")
+				if isFromOldVersion {
+					log.Println("WARNING: Couldn't read file due to recent change in v3.3.0, see https://github.com/TwiN/gatus/issues/191")
+					log.Println("WARNING: Will automatically rename old file to " + file + ".old and overwrite the current file")
+					if err = ioutil.WriteFile(file+".old", data, fs.ModePerm); err != nil {
+						log.Println("WARNING: Tried my best to keep the old file, but it wasn't enough. Sorry, your file will be overwritten :(")
+					}
+					// Return the store regardless of whether there was an error or not
+					return store, nil
+				}
+			}
+			// XXX: Remove the block above in v4.0.0
 			return nil, err
 		}
 	}