Never cancel the sync scheduler while worker's run()

Currently, worker can stop due to various errors. But, there are not only HTTP
connection errors but also many errors that worker can retry it later, such as
DB connection error or timeout, etc.

Author: joojis

src/worker/index.ts

@@ -40,19 +40,24 @@ export default class Worker {
     }
 
     public run = async () => {
+        let lastError: Error | null = null;
         this.watchJob = scheduleJob(this.config.watchSchedule, async () => {
             try {
                 if (this.lock.isBusy(ASYNC_LOCK_KEY) === false) {
                     await this.sync();
                 }
+                lastError = null;
             } catch (err) {
-                const error = err as Error;
-                if (error.message.search(/ECONNRESET|ECONNREFUSED/) >= 0) {
-                    console.error("RPC Error");
-                } else {
-                    console.error(error);
-                    this.watchJob.cancel(false);
+                if (
+                    lastError &&
+                    err &&
+                    lastError.name === err.name &&
+                    lastError.message === err.message
+                ) {
+                    return;
                 }
+                lastError = err;
+                console.error("sync error: ", err);
             }
         });
         this.watchJob.invoke();