chore: setup Sentry middleware in indexer

.changeset/large-schools-grow.md

@@ -0,0 +1,5 @@
+---
+"@latticexyz/store-indexer": patch
+---
+
+Added a Sentry middleware and `SENTRY_DNS` environment variable to the postgres indexer.

packages/store-indexer/bin/postgres-frontend.ts

@@ -11,6 +11,7 @@ import postgres from "postgres";
 import { frontendEnvSchema, parseEnv } from "./parseEnv";
 import { createQueryAdapter } from "../src/postgres/deprecated/createQueryAdapter";
 import { apiRoutes } from "../src/postgres/apiRoutes";
+import { registerSentryMiddlewares } from "../src/sentry";
 
 const env = parseEnv(
   z.intersection(
@@ -24,6 +25,11 @@ const env = parseEnv(
 const database = postgres(env.DATABASE_URL);
 
 const server = new Koa();
+
+if (process.env.SENTRY_DSN) {
+  registerSentryMiddlewares(server);
+}
+
 server.use(cors());
 server.use(apiRoutes(database));
 

packages/store-indexer/package.json

@@ -42,6 +42,9 @@
     "@latticexyz/protocol-parser": "workspace:*",
     "@latticexyz/store": "workspace:*",
     "@latticexyz/store-sync": "workspace:*",
+    "@sentry/node": "^7.86.0",
+    "@sentry/profiling-node": "^1.2.6",
+    "@sentry/utils": "^7.86.0",
     "@trpc/client": "10.34.0",
     "@trpc/server": "10.34.0",
     "accepts": "^1.3.8",

packages/store-indexer/src/sentry.ts

@@ -0,0 +1,105 @@
+import * as Sentry from "@sentry/node";
+import { ProfilingIntegration } from "@sentry/profiling-node";
+import { stripUrlQueryAndFragment } from "@sentry/utils";
+import { debug } from "./debug";
+import Koa from "koa";
+
+Sentry.init({
+  dsn: process.env.SENTRY_DSN,
+  integrations: [
+    // Automatically instrument Node.js libraries and frameworks
+    ...Sentry.autoDiscoverNodePerformanceMonitoringIntegrations(),
+    new ProfilingIntegration(),
+  ],
+  // Performance Monitoring
+  tracesSampleRate: 1.0,
+  // Set sampling rate for profiling - this is relative to tracesSampleRate
+  profilesSampleRate: 1.0,
+});
+
+const requestHandler: Koa.Middleware = (ctx, next) => {
+  return new Promise<void>((resolve, reject) => {
+    Sentry.runWithAsyncContext(async () => {
+      const hub = Sentry.getCurrentHub();
+      hub.configureScope((scope) =>
+        scope.addEventProcessor((event) =>
+          Sentry.addRequestDataToEvent(event, ctx.request, {
+            include: {
+              user: false,
+            },
+          })
+        )
+      );
+
+      try {
+        await next();
+      } catch (err) {
+        reject(err);
+      }
+      resolve();
+    });
+  });
+};
+
+// This tracing middleware creates a transaction per request
+const tracingMiddleWare: Koa.Middleware = async (ctx, next) => {
+  const reqMethod = (ctx.method || "").toUpperCase();
+  const reqUrl = ctx.url && stripUrlQueryAndFragment(ctx.url);
+
+  // Connect to trace of upstream app
+  let traceparentData;
+  if (ctx.request.get("sentry-trace")) {
+    traceparentData = Sentry.extractTraceparentData(ctx.request.get("sentry-trace"));
+  }
+
+  const transaction = Sentry.startTransaction({
+    name: `${reqMethod} ${reqUrl}`,
+    op: "http.server",
+    ...traceparentData,
+  });
+
+  ctx.__sentry_transaction = transaction;
+
+  // We put the transaction on the scope so users can attach children to it
+  Sentry.getCurrentHub().configureScope((scope) => {
+    scope.setSpan(transaction);
+  });
+
+  ctx.res.on("finish", () => {
+    // Push `transaction.finish` to the next event loop so open spans have a chance to finish before the transaction closes
+    setImmediate(() => {
+      // If you're using koa router, set the matched route as transaction name
+      if (ctx._matchedRoute) {
+        const mountPath = ctx.mountPath || "";
+        transaction.setName(`${reqMethod} ${mountPath}${ctx._matchedRoute}`);
+      }
+
+      transaction.setHttpStatus(ctx.status);
+      transaction.finish();
+    });
+  });
+
+  await next();
+};
+
+const errorHandler: Koa.Middleware = async (ctx, next) => {
+  try {
+    await next();
+  } catch (err) {
+    Sentry.withScope((scope) => {
+      scope.addEventProcessor((event) => {
+        return Sentry.addRequestDataToEvent(event, ctx.request);
+      });
+      Sentry.captureException(err);
+    });
+    throw err;
+  }
+};
+
+export const registerSentryMiddlewares = (server: Koa): void => {
+  debug("Registering Sentry middlewares");
+
+  server.use(errorHandler);
+  server.use(requestHandler);
+  server.use(tracingMiddleWare);
+};