refactor: streamline email sending process and improve logging in EmailService

backend/src/entities/cron-jobs/cron-jobs.service.ts

@@ -72,9 +72,8 @@ export class CronJobsService {
           Constants.EXCEPTIONS_CHANNELS,
         );
       } else {
-        // const mailingResultToString = this.sentEmailsToSimpleString(mailingResults);
-        await slackPostMessage(JSON.stringify(mailingResults), Constants.EXCEPTIONS_CHANNELS);
-        // await this.sendEmailResultsToSlack(mailingResults);
+        // await slackPostMessage(JSON.stringify(mailingResults), Constants.EXCEPTIONS_CHANNELS);
+        await this.sendEmailResultsToSlack(mailingResults);
         await slackPostMessage(
           `morning cron finished at ${Constants.CURRENT_TIME_FORMATTED()}`,
           Constants.EXCEPTIONS_CHANNELS,
@@ -133,15 +132,10 @@ export class CronJobsService {
     for (let i = 0; i < results.length; i += chunkSize) {
       const chunk = results.slice(i, i + chunkSize);
       const message = this.emailCronResultToSlackString(chunk);
+      if (!message) {
+        continue;
+      }
       await slackPostMessage(message, Constants.EXCEPTIONS_CHANNELS);
     }
   }
-
-  private sentEmailsToSimpleString(results: Array<ICronMessagingResults>): string | null {
-    const emailsSent = results.map((result) => {
-      return result.accepted && result.accepted.length > 0 ? result.accepted.join(', ') : '-';
-    });
-    const emailsSentString = emailsSent.join(', \n');
-    return emailsSentString;
-  }
 }

backend/src/entities/email/email/email.service.ts

@@ -81,11 +81,9 @@ export class EmailService {
   public async sendRemindersToUsers(userEmails: Array<string>): Promise<Array<ICronMessagingResults>> {
     const queue = new PQueue({ concurrency: 8 });
     const mailingResults: Array<SMTPTransport.SentMessageInfo | void> = await Promise.all(
-      userEmails.map(async (email: string, index) => {
+      userEmails.map(async (email: string) => {
         return await queue.add(async () => {
-          const result = await this.sendReminderToUser(email);
-          console.info(`${index} email sending result ${JSON.stringify(result)}`);
-          return result;
+          return await this.sendReminderToUser(email);
         });
       }),
     );
@@ -275,16 +273,18 @@ export class EmailService {
   }
 
   private buildMailingResults(results: Array<SMTPTransport.SentMessageInfo | void>): Array<ICronMessagingResults> {
-    return results.map((result) => {
-      if (!result) {
-        return;
-      }
-      const { messageId, accepted, rejected } = result;
-      return {
-        messageId: messageId ? messageId : undefined,
-        accepted: accepted ? accepted : undefined,
-        rejected: rejected ? rejected : undefined,
-      };
-    });
+    return results
+      .map((result) => {
+        if (!result) {
+          return;
+        }
+        const { messageId, accepted, rejected } = result;
+        return {
+          messageId: messageId ? messageId : undefined,
+          accepted: accepted ? accepted : undefined,
+          rejected: rejected ? rejected : undefined,
+        };
+      })
+      .filter((result) => !!result);
   }
 }