fix: 사서회의 메세지는 예약전송으로 변경

src/constants/events.js

@@ -1,4 +1,7 @@
 export const ATTENDED = 'attended';
 export const MEETING = '정기사서회의';
+export const MEETING_MESSAGE_DELAY = 5;
+export const MEETING_FALLBACK_MESSAGE =
+  '이 메세지를 보신다면 @sujikim DM 부탁드려요';
 export const SHIFT = '사서근무';
 export const SHIFT_WEEKEND = '주말사서근무';

src/services/meeting.js

@@ -1,7 +1,11 @@
-import { MEETING } from '../constants/events.js';
+import {
+  MEETING,
+  MEETING_FALLBACK_MESSAGE,
+  MEETING_MESSAGE_DELAY,
+} from '../constants/events.js';
 import { SLACK_ID_RANGE } from '../constants/sheet.js';
 import { confirmMessage } from '../messages/confirmMessage.js';
-import { sendBlocks } from '../utils/slackChat.js';
+import { scheduleBlocks } from '../utils/slackChat.js';
 import { httpClientForSheet } from '../utils/httpClient.js';
 
 export const sendMeetingConfirmation = async () => {
@@ -10,7 +14,14 @@ export const sendMeetingConfirmation = async () => {
   const librarians = await getLibrariansFromSheet();
 
   await Promise.all(
-    librarians.map((librarian) => sendBlocks(librarian, message))
+    librarians.map((librarian) =>
+      scheduleBlocks(
+        librarian,
+        message,
+        MEETING_FALLBACK_MESSAGE,
+        MEETING_MESSAGE_DELAY
+      )
+    )
   );
   console.log('meeting', librarians);
 };

src/utils/slackChat.js

@@ -1,4 +1,5 @@
 import { WebClient } from '@slack/web-api';
+import { getFutureUnixTimestamp } from './unixTimeStamp.js';
 
 const token = process.env.SLACK_TOKEN;
 const web = new WebClient(token);
@@ -18,3 +19,13 @@ export const sendBlocks = async (to, blocks) => {
     blocks,
   });
 };
+
+export const scheduleBlocks = async (to, blocks, fallbackMessage, minutes) => {
+  await web.chat.scheduleMessage({
+    token,
+    channel: to,
+    blocks,
+    text: fallbackMessage,
+    post_at: getFutureUnixTimestamp(minutes),
+  });
+};

src/utils/unixTimeStamp.js

@@ -0,0 +1,6 @@
+export const getFutureUnixTimestamp = (minutes) => {
+  const seconds = typeof minutes !== 'number' ? 0 : minutes * 60;
+  const currentTimestamp = Math.floor(Date.now().getTime() / 1000); // 초 단위로 변환
+
+  return currentTimestamp + seconds * 60;
+};