feat: Document subscriptions (#3834)

Co-authored-by: Tom Moor <tom.moor@gmail.com>

server/scripts/20220722000000-backfill-subscriptions.ts

@@ -0,0 +1,51 @@
+import "./bootstrap";
+import { Subscription, Document } from "@server/models";
+
+const limit = 100;
+let page = parseInt(process.argv[2], 10);
+page = Number.isNaN(page) ? 0 : page;
+
+export default async function main(exit = false) {
+  const work = async (page: number) => {
+    console.log(`Backfill subscription… page ${page}`);
+
+    // Retrieve all documents within set limit.
+    const documents = await Document.findAll({
+      attributes: ["collaboratorIds", "id"],
+      limit,
+      offset: page * limit,
+      order: [["createdAt", "ASC"]],
+    });
+
+    for (const document of documents) {
+      try {
+        await Promise.all(
+          document.collaboratorIds.map((collaboratorId) =>
+            Subscription.findOrCreate({
+              where: {
+                userId: collaboratorId,
+                documentId: document.id,
+                event: "documents.update",
+              },
+            })
+          )
+        );
+      } catch (err) {
+        console.error(`Failed at ${document.id}:`, err);
+
+        continue;
+      }
+    }
+  };
+
+  await work(page);
+
+  if (exit) {
+    console.log("Backfill complete");
+    process.exit(0);
+  }
+}
+
+if (process.env.NODE_ENV !== "test") {
+  main(true);
+}