add support heartbeat to couchdb-changes-stream

services/message-delivery-method-web-push/src/server.ts

@@ -1,21 +1,27 @@
 import webpush from "web-push";
 
-import { CouchDBChangesStream } from "couchdb-changes-stream";
+import { CouchDBChangesStream } from "@hereconnect/couchdb-changes-stream";
 import { qrDb, messagesDbUrl, webPushSubscriptionsDb } from "./dbs";
 import { setupVapidDetails } from "./setupVapidDetails";
 import type { MessageDocument } from "@hereconnect/types";
 import { ServiceSeqTracker } from "./serviceSeqTracker";
+import { startHealthServer } from "./health-server";
 
-const serviceSeqTracker = new ServiceSeqTracker();
+const abortController = new AbortController();
+
+startHealthServer(abortController);
 
 const start = async () => {
   await setupVapidDetails();
-  const since = await serviceSeqTracker.getSince();
+  const serviceSeqTracker = await ServiceSeqTracker.Init(
+    "_local/service:message-delivery-method-web-push",
+  );
 
   const changesStream = new CouchDBChangesStream<MessageDocument>(
     messagesDbUrl,
     {
-      since,
+      abortController,
+      since: serviceSeqTracker.lastSeq,
       feed: "continuous",
       include_docs: true,
       heartbeat: 1000,
@@ -28,12 +34,12 @@ const start = async () => {
 
   // Gracefully handle SIGINT
   process.on("SIGINT", async () => {
-    changesStream.stop();
+    changesStream?.stop();
     process.stdout.write("\n");
     process.exit(2);
   });
 
-  console.info("Service started from sequence", since);
+  console.info("Service started from sequence", serviceSeqTracker.lastSeq);
 
   for await (const change of changesStream) {
     const { seq, doc: msgDoc } = change;
@@ -68,7 +74,7 @@ const start = async () => {
 
         for (const row of rows) {
           try {
-            const subscription = row.doc.subscription;
+            const subscription = row.doc!.subscription;
             const topic = `chat-${msgDoc.qr_code_uri}-${msgDoc.chat}`;
             const tag = `${topic}-${(new Date(msgDoc.created_at).getTime() - new Date(qrDoc.created_at).getTime()).toString(36)}`;