From 04e99b912eb43b0e6a2a08094baeb83c3de1fa17 Mon Sep 17 00:00:00 2001
From: Dermot Duffy <dermot.duffy@gmail.com>
Date: Tue, 28 Mar 2023 20:23:20 -0700
Subject: [PATCH] Increase load performance by dynamically loading engines.

---
 src/camera-manager/engine-factory.ts | 10 ++++++----
 src/camera-manager/manager.ts        |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/camera-manager/engine-factory.ts b/src/camera-manager/engine-factory.ts
index 42069466..afb8cbbe 100644
--- a/src/camera-manager/engine-factory.ts
+++ b/src/camera-manager/engine-factory.ts
@@ -9,9 +9,6 @@ import { ResolvedMediaCache } from '../utils/ha/resolved-media';
 import { MemoryRequestCache, RecordingSegmentsCache, RequestCache } from './cache';
 import { CameraManagerEngine } from './engine';
 import { CameraInitializationError } from './error';
-import { FrigateCameraManagerEngine } from './frigate/engine-frigate';
-import { GenericCameraManagerEngine } from './generic/engine-generic';
-import { MotionEyeCameraManagerEngine } from './motioneye/engine-motioneye';
 import { Engine } from './types';
 
 export class CameraManagerEngineFactory {
@@ -29,13 +26,15 @@ export class CameraManagerEngineFactory {
     this._resolvedMediaCache = resolvedMediaCache;
   }
 
-  public createEngine(engine: Engine): CameraManagerEngine | null {
+  public async createEngine(engine: Engine): Promise<CameraManagerEngine | null> {
     let cameraManagerEngine: CameraManagerEngine | null = null;
     switch (engine) {
       case Engine.Generic:
+        const { GenericCameraManagerEngine } = await import('./generic/engine-generic');
         cameraManagerEngine = new GenericCameraManagerEngine();
         break;
       case Engine.Frigate:
+        const { FrigateCameraManagerEngine } = await import('./frigate/engine-frigate');
         cameraManagerEngine = new FrigateCameraManagerEngine(
           this._cardWideConfig,
           new RecordingSegmentsCache(),
@@ -43,6 +42,9 @@ export class CameraManagerEngineFactory {
         );
         break;
       case Engine.MotionEye:
+        const { MotionEyeCameraManagerEngine } = await import(
+          './motioneye/engine-motioneye'
+        );
         cameraManagerEngine = new MotionEyeCameraManagerEngine(
           new BrowseMediaManager(new MemoryRequestCache<string, BrowseMedia>()),
           this._resolvedMediaCache,
diff --git a/src/camera-manager/manager.ts b/src/camera-manager/manager.ts
index e128e400..e5f26294 100644
--- a/src/camera-manager/manager.ts
+++ b/src/camera-manager/manager.ts
@@ -142,7 +142,7 @@ export class CameraManager {
     for (const [index, cameraConfig] of camerasConfig.entries()) {
       const engineType = engineTypes[index];
       const engine = engineType
-        ? engines.get(engineType) ?? this._engineFactory.createEngine(engineType)
+        ? engines.get(engineType) ?? await this._engineFactory.createEngine(engineType)
         : null;
       if (!engine || !engineType) {
         throw new CameraInitializationError(