Improve RCP communication by sending out reminders (#3070)

* Improve RCP communication

* Only run this on the adobecom repo

* Wording

* Prettify the file

.github/workflows/helpers.js

@@ -149,4 +149,5 @@ module.exports = {
   slackNotification,
   pulls: { addLabels, addFiles, getChecks, getReviews },
   isWithinRCP,
+  RCPDates,
 };

.github/workflows/merge-to-stage.js

@@ -230,7 +230,7 @@ const main = async (params) => {
   github = params.github;
   owner = params.context.repo.owner;
   repo = params.context.repo.repo;
-  if (isWithinRCP(2)) return console.log('Stopped, within RCP period.');
+  if (isWithinRCP(process.env.STAGE_RCP_OFFSET_DAYS || 2)) return console.log('Stopped, within RCP period.');
 
   try {
     const stageToMainPR = await getStageToMainPR();

.github/workflows/merge-to-stage.yaml

@@ -13,6 +13,7 @@ env:
   SLACK_HIGH_IMPACT_PR_WEBHOOK: ${{ secrets.SLACK_HIGH_IMPACT_PR_WEBHOOK }}
   MILO_STAGE_SLACK_WH: ${{secrets.MILO_STAGE_SLACK_WH}}
   MAX_PRS_PER_BATCH: ${{secrets.MAX_PRS_PER_BATCH}}
+  STAGE_RCP_OFFSET_DAYS: ${{secrets.STAGE_RCP_OFFSET_DAYS}}
 
 jobs:
   merge-to-stage:

.github/workflows/rcp-notifier.js

@@ -0,0 +1,46 @@
+const {
+  slackNotification,
+  getLocalConfigs,
+  RCPDates,
+} = require('./helpers.js');
+
+const isWithin24Hours = (targetDate) =>
+  Math.abs(new Date() - targetDate) <= 24 * 60 * 60 * 1000;
+
+const calculateDateOffset = (date, offset) => {
+  const newDate = new Date(date);
+  newDate.setDate(newDate.getDate() - offset);
+  return newDate;
+};
+
+// Run from the root of the project for local testing: node --env-file=.env .github/workflows/rcp-notifier.js
+const main = async () => {
+  console.log('Action: RCP Notifier started');
+  for (const rcp of RCPDates) {
+    const start = new Date(rcp.start);
+    const end = new Date(rcp.end);
+    const tenDaysBefore = calculateDateOffset(start, 10);
+    const fourDaysBefore = calculateDateOffset(start, 4);
+    const stageOffset = Number(process.env.STAGE_RCP_OFFSET_DAYS) || 2;
+    const slackText = (days) =>
+      `Reminder RCP starts in ${days} days: from ${start.toUTCString()} to ${end.toUTCString()}. Merges to stage will be disabled beginning ${calculateDateOffset(start, stageOffset).toUTCString()}.`;
+    if (isWithin24Hours(tenDaysBefore)) {
+      console.log('Is within 24 hours of 10 days before RCP');
+      await slackNotification(slackText(10), process.env.MILO_DEV_HOOK);
+    }
+
+    if (isWithin24Hours(fourDaysBefore)) {
+      console.log('Is within 24 hours of 4 days before RCP');
+      await slackNotification(slackText(4), process.env.MILO_DEV_HOOK);
+    }
+  }
+
+  console.log('Action: RCP Notifier completed');
+};
+
+if (process.env.LOCAL_RUN) {
+  const { context } = getLocalConfigs();
+  main({ context });
+}
+
+module.exports = main;

.github/workflows/rcp-notifier.yml

@@ -0,0 +1,24 @@
+name: RCP Notifier
+
+on:
+  schedule:
+    - cron: '43 9 * * *' # 9.43am UTC
+
+env:
+  STAGE_RCP_OFFSET_DAYS: ${{ secrets.STAGE_RCP_OFFSET_DAYS }}
+  MILO_DEV_HOOK: ${{ secrets.MILO_DEV_HOOK }}
+
+jobs:
+  rcp-notification:
+    if: github.repository_owner == 'adobecom'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Create RCP Notification
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const main = require('./.github/workflows/rcp-notifier.js')
+            main({ github, context })