judge: 记录测试数据的最后使用时间

packages/hydrojudge/src/hosts/hydro.ts

@@ -226,6 +226,7 @@ export default class Hydro {
             fs.writeFileSync(path.join(filePath, 'etags'), JSON.stringify(version));
             await this.processData(filePath).catch(noop);
         }
+        fs.writeFileSync(path.join(filePath, 'lastUsage'), new Date().getTime().toString());
         return filePath;
     }
 

packages/hydrojudge/src/hosts/vj4.ts

@@ -387,12 +387,16 @@ export default class VJ4 {
             try {
                 ver = fs.readFileSync(path.join(filePath, 'version')).toString();
             } catch (e) { /* ignore */ }
-            if (version === ver) return filePath;
+            if (version === ver) {
+                fs.writeFileSync(path.join(filePath, 'lastUsage'), new Date().getTime().toString());
+                return filePath;
+            }
             fs.removeSync(filePath);
         }
         fs.ensureDirSync(domainDir);
         await this.problemData(domainId, pid, filePath, 3, next);
         fs.writeFileSync(path.join(filePath, 'version'), version);
+        fs.writeFileSync(path.join(filePath, 'lastUsage'), new Date().getTime().toString());
         return filePath;
     }
 

packages/hydrojudge/src/service.ts

@@ -86,6 +86,7 @@ async function postInit() {
             }
         }
         fs.writeFileSync(path.join(filePath, 'etags'), JSON.stringify(version));
+        fs.writeFileSync(path.join(filePath, 'lastUsage'), new Date().getTime().toString());
         await processData(filePath).catch(noop);
         return filePath;
     }