feat: Write latest post block height to Grafana

indexer-js-queue-handler/latest-post-metrics-writer.js

@@ -0,0 +1,24 @@
+import fetch from "node-fetch";
+import AWS from "aws-sdk";
+
+import Metrics from "./metrics";
+
+export const handler = async () => {
+    const metrics = new Metrics("QueryAPI");
+
+    const response = await this.deps.fetch("https://api.near.social/index", {
+        method: "POST",
+        body: JSON.stringify({
+            action: "post",
+            key: "main",
+            options: {
+                limit: 1,
+                order: "desc",
+            },
+        }),
+    });
+
+    const [{ blockHeight }] = await response.json();
+
+    await metrics.putBlockHeight("social.near", "posts", blockHeight);
+};

indexer-js-queue-handler/serverless.yml

@@ -39,6 +39,10 @@ constructs:
       timeout: 15 # 1.5 minutes as lift multiplies this value by 6 (https://github.com/getlift/lift/blob/master/docs/queue.md#retry-delay)
 
 functions:
+  latestPostMetricsWriter:
+    handler: latest-post-metrics-writer.handler
+    events:
+      - schedule: rate(1 minute)
 
 plugins:
   - serverless-lift