Change DSN in Lambda Layer to point to relay running in Lambda Extension. (#5126)

If the serverless SDK is running in an AWS Lambda Function it should not send data directly to sentry.io but to the relay that is running in the AWS Lambda Extension (which is running on localhost:3000)

This PR parses the DSN and changes the host and port to point to localhost:3000.

Author: antonpirker

packages/serverless/src/awslambda.ts

@@ -11,7 +11,7 @@ import {
 } from '@sentry/node';
 import { extractTraceparentData } from '@sentry/tracing';
 import { Integration } from '@sentry/types';
-import { isString, logger } from '@sentry/utils';
+import { extensionRelayDSN, isString, logger } from '@sentry/utils';
 // NOTE: I have no idea how to fix this right now, and don't want to waste more time, as it builds just fine — Kamil
 // eslint-disable-next-line import/no-unresolved
 import { Context, Handler } from 'aws-lambda';
@@ -79,6 +79,8 @@ export function init(options: Sentry.NodeOptions = {}): void {
     version: Sentry.SDK_VERSION,
   };
 
+  options.dsn = extensionRelayDSN(options.dsn)
+
   Sentry.init(options);
   Sentry.addGlobalEventProcessor(serverlessEventProcessor);
 }

packages/utils/src/dsn.ts

@@ -27,6 +27,12 @@ export function dsnToString(dsn: DsnComponents, withPassword: boolean = false):
   );
 }
 
+/**
+ * Parses a Dsn from a given string.
+ *
+ * @param str A Dsn as string
+ * @returns Dsn as DsnComponents
+ */
 function dsnFromString(str: string): DsnComponents {
   const match = DSN_REGEX.exec(str);
 
@@ -101,3 +107,25 @@ export function makeDsn(from: DsnLike): DsnComponents {
   validateDsn(components);
   return components;
 }
+
+
+/**
+ * Changes a Dsn to point to the `relay` server running in the Lambda Extension.
+ *
+ * This is only used by the serverless integration for AWS Lambda.
+ *
+ * @param originalDsn The original Dsn of the customer.
+ * @returns Dsn pointing to Lambda extension.
+ */
+export function extensionRelayDSN(originalDsn: string | undefined): string | undefined {
+  if (originalDsn === undefined) {
+    return undefined;
+  }
+
+  const dsn = dsnFromString(originalDsn);
+  dsn.host = 'localhost';
+  dsn.port = '3000';
+  dsn.protocol = 'http';
+
+  return dsnToString(dsn);
+}