fix: Enhance LocalStack region detection and logging in IoT service connection

Author: ServerlessLife

src/extension/interceptor.ts

@@ -48,6 +48,13 @@ async function regularMode(context: any, event: any) {
     });
   }, 5 * 1000);
 
+  let region: string | undefined;
+  if (process.env.NODE_TLS_REJECT_UNAUTHORIZED === '0') {
+    // it is localstack
+    region = process.env.AWS_REGION;
+    Logger.verbose(`Region is set to ${region} due to LocalStack detection`);
+  }
+
   const ioTService = await IoTService.connect({
     onMessage: async (message: IoTMessage) => {
       if (Logger.isVerbose()) {
@@ -83,6 +90,7 @@ async function regularMode(context: any, event: any) {
       }
     },
     topic,
+    region,
   });
 
   const payload: IoTMessage = {

src/ioTService.ts

@@ -122,19 +122,12 @@ async function connect(props?: {
     credentials,
   });
 
-  let region = props?.region;
-
-  if (!region && process.env.NODE_TLS_REJECT_UNAUTHORIZED === '0') {
-    // it is localstack
-    region = process.env.AWS_REGION ?? 'us-east-1';
-  }
-
   device = new iot.device({
     protocol: 'wss',
     host: endpoint,
     reconnectPeriod: 1,
     keepalive: 60,
-    region,
+    region: props?.region,
     accessKeyId: credentials?.accessKeyId,
     secretKey: credentials?.secretAccessKey,
     sessionToken: credentials?.sessionToken,

src/lambdaConnection.ts

@@ -13,6 +13,15 @@ const lambdasProcessingObservableMode = new Set<string>();
  */
 async function connect() {
   topic = `${Configuration.config.debuggerId}/events`;
+
+  let region = Configuration.config.region;
+  if (!region && Configuration.config.localStack) {
+    region = process.env.AWS_REGION || 'us-east-1';
+    Logger.verbose(
+      `Empty region detected with LocalStack, defaulting to ${region}`,
+    );
+  }
+
   ioTServiceConnection = await IoTService.connect({
     onMessage: onMessageFromLambda,
     topic,