From 201ec093b7ab676d5d7a84972c5d9e64664af7e0 Mon Sep 17 00:00:00 2001
From: Karl-Philipp Wulfert <krlwlfrt@gmail.com>
Date: Tue, 5 Feb 2019 15:52:08 +0100
Subject: [PATCH] feat: add new task to remind about open merge requests

---
 src/tasks/remind.ts | 105 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/tasks/remind.ts

diff --git a/src/tasks/remind.ts b/src/tasks/remind.ts
new file mode 100644
index 00000000..33eb7add
--- /dev/null
+++ b/src/tasks/remind.ts
@@ -0,0 +1,105 @@
+import {Api} from '@openstapps/gitlab-api';
+import {
+  AccessLevel,
+  MembershipScope,
+  MergeRequestMergeStatus,
+  MergeRequestState,
+  Scope,
+  User,
+} from '@openstapps/gitlab-api/lib/types';
+import {WebClient} from '@slack/client';
+import {asyncPool} from 'async-pool-native/dist/async-pool';
+import {logger} from '../common';
+import {GROUPS} from '../configuration';
+
+export async function remind(api: Api): Promise<void> {
+  // get list of open merge requests
+  const mergeRequests = await api.getMergeRequests(MembershipScope.GROUPS, GROUPS[0], MergeRequestState.OPENED);
+
+  logger.info(`Found ${mergeRequests.length} open merge requests.`);
+
+  // instantiate slack client
+  const client = new WebClient(process.env.SLACK_API_TOKEN);
+
+  // get members of main group
+  const members = await api.getMembers(MembershipScope.GROUPS, GROUPS[0]);
+
+  // filter members with at least maintainer status
+  const maintainers = members.filter((member) => member.access_level >= AccessLevel.Maintainer);
+
+  // extract maintainer's usernames
+  const maintainerUsernames = maintainers.map((maintainer) => maintainer.username);
+
+  // sort maintainer's usernames alphabetically
+  maintainerUsernames.sort((a, b) => {
+    return a.localeCompare(b);
+  });
+
+  logger.info(`Found ${maintainers.length} maintainer(s).`);
+
+  await asyncPool(2, mergeRequests, async (mergeRequest) => {
+    // check if merge request is WIP
+    if (mergeRequest.work_in_progress) {
+      logger.info(`Merge request '${mergeRequest.title}' is WIP.`);
+      return;
+    }
+
+    // get merge request approval
+    const approval = await api.getMergeRequestApproval(mergeRequest.project_id, mergeRequest.iid);
+
+    if (approval.merge_status === MergeRequestMergeStatus.CAN_BE_MERGED) {
+      if (approval.approvals_left > 0) {
+        logger.warn(`Merge request '${mergeRequest.title}' needs more approvals!`);
+
+        // get possible appropers, prefixed with '@' and joined with commas
+        const possibleApprovers = maintainerUsernames
+          .filter((username) => {
+            if (approval.approved_by.length === 0) {
+              return true;
+            }
+
+            return approval.approved_by.find((approver: { user: User }) => {
+              return approver.user.username !== username;
+            });
+          })
+          .map((username) => '@' + username)
+          .join(', ');
+
+        // send message to slack
+        await client.chat.postMessage({
+          channel: 'C762UG76Z',
+          text: `Merge request '${mergeRequest.title}' needs more approvals! See ${mergeRequest.web_url}!`,
+        });
+
+        // create note in merge request
+        await api.createNote(
+          mergeRequest.project_id,
+          Scope.MERGE_REQUESTS,
+          mergeRequest.iid,
+          `Please review, ${possibleApprovers}!`,
+        );
+      } else {
+        logger.log(`Merge request '${mergeRequest.title}' is ready to be merged!`);
+
+        // send message to slack
+        await client.chat.postMessage({
+          channel: 'C762UG76Z',
+          text: `Merge request '${mergeRequest.title}' is ready to be merged! See ${mergeRequest.web_url}!`,
+        });
+
+        // prefix maintainers with '@' and join with commas
+        const possibleMergers = maintainerUsernames
+          .map((username) => '@' + username)
+          .join(', ');
+
+        // create note in merge request
+        await api.createNote(
+          mergeRequest.project_id,
+          Scope.MERGE_REQUESTS,
+          mergeRequest.iid,
+          `Merge request is ready to be merged, ${possibleMergers}!`,
+        );
+      }
+    }
+  });
+}