Add support for taking heap dumps

This change adds a SIGUSR2 handler to write v8 heap dumps to the /tmp/
directory, in an effort to collect data to investigate #20.

package.json

@@ -1,7 +1,7 @@
 {
   "displayName": "Lutron Caseta LEAP",
   "name": "homebridge-lutron-caseta-leap",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "description": "Support for the Lutron Caseta Smart Bridge 2 (non-pro)",
   "license": "Apache-2.0",
   "repository": {

src/platform.ts

@@ -10,6 +10,10 @@ import { SerenaTiltOnlyWoodBlinds } from './SerenaTiltOnlyWoodBlinds';
 import { PicoRemote } from './PicoRemote';
 import { BridgeManager } from './BridgeManager';
 
+import fs from 'fs';
+import v8 from 'v8';
+import process from 'process';
+
 interface PlatformEvents {
     unsolicited: (response: Response) => void;
 }
@@ -64,6 +68,15 @@ export class LutronCasetaLeap
             });
         });
 
+        process.on('SIGUSR2', () => {
+            const fileName = `/tmp/lutron.${Date.now()}.heapsnapshot`;
+            this.log.warn(`Got request to dump heap. Dumping to ${fileName}`);
+            const snapshotStream = v8.getHeapSnapshot();
+            const fileStream = fs.createWriteStream(fileName);
+            snapshotStream.pipe(fileStream);
+            this.log.info(`Heap dump to ${fileName} finished.`);
+        });
+
         log.info('LutronCasetaLeap plugin finished early initialization');
     }