extensions-api -- in-progress

Signed-off-by: Roman <ixrock@gmail.com>

src/extensions/example-extension/README.md

@@ -0,0 +1,3 @@
+# Lens Example Extension
+
+*TODO*: add more info

src/extensions/example-extension/example-extension.ts

@@ -1,6 +1,6 @@
 import { LensExtension } from "@lens"; // todo: handle runtime import
 
-export class ExampleExtension extends LensExtension {
+export default class ExampleExtension extends LensExtension {
   async init(): Promise<any> {
     console.log('Example extension: init')
     return super.init();

src/extensions/extension-store.ts

@@ -1,11 +1,10 @@
 import path from "path";
-import { action, observable, toJS } from "mobx";
+import fs from "fs-extra";
+import { action, comparer, observable, toJS } from "mobx";
 import { BaseStore } from "../common/base-store";
-import { LensExtension } from "./extension";
+import { ExtensionId, ExtensionVersion, LensExtension } from "./extension";
 import { isDevelopment } from "../common/vars";
-
-export type ExtensionId = string;
-export type ExtensionVersion = string | number;
+import logger from "../main/logger";
 
 export interface ExtensionStoreModel {
   version: ExtensionVersion;
@@ -16,6 +15,7 @@ export interface ExtensionModel {
   id: ExtensionId;
   version: ExtensionVersion;
   name: string;
+  manifestPath: string;
   description?: string;
   enabled?: boolean;
   updateUrl?: string;
@@ -31,6 +31,21 @@ export class ExtensionStore extends BaseStore<ExtensionStoreModel> {
   @observable version: ExtensionVersion = "0.0.0";
   @observable extensions = observable.map<ExtensionId, LensExtension>();
   @observable removed = observable.map<ExtensionId, LensExtension>();
+  @observable installed = observable.set<LensExtension>([], { equals: comparer.shallow });
+
+  async load() {
+    await this.loadExtensions();
+    return super.load();
+  }
+
+  async loadExtensions() {
+    const localExtensions = await fs.readdir(this.builtInExtensionsPath);
+    logger.info(`[EXTENSIONS]: scanning installed extensions`, { paths: localExtensions });
+    this.installed.replace(localExtensions as any[]);
+    // return localExtensions
+    // .filter(path => ![".", ".."].includes(path))
+    // .map(path => import(`${path}/package.json`));
+  }
 
   get builtInExtensionsPath(): string {
     if (isDevelopment) {

src/extensions/extension.ts

@@ -1,5 +1,8 @@
-import { observable } from "mobx";
+import { readJsonSync } from "fs-extra";
+import { action, observable, when } from "mobx";
 import { ExtensionModel } from "./extension-store";
+import extensionManifest from "./example-extension/package.json"
+import logger from "../main/logger";
 
 // TODO: extensions api
 // * Lazy load/unload extension (js/ts?) (from sources: local folder, npm_modules/@lens/some_plugin, etc.)
@@ -9,27 +12,41 @@ import { ExtensionModel } from "./extension-store";
 
 export type ExtensionId = string;
 export type ExtensionVersion = string | number;
+export type ExtensionManifest = typeof extensionManifest;
 
 export class LensExtension implements ExtensionModel {
   public id: ExtensionId;
-  public version: string | number;
   public updateUrl: string;
 
   @observable name = "";
   @observable description = "";
+  @observable version: ExtensionVersion = "0.0.0";
+  @observable manifest: ExtensionManifest;
+  @observable manifestPath: string;
+  @observable isReady = false;
   @observable isEnabled = false;
-  @observable isInstalled = false;
+
+  whenReady = when(() => this.isReady);
 
   constructor(model: ExtensionModel) {
     this.importModel(model);
   }
 
-  importModel({ enabled, ...model }: ExtensionModel) {
-    Object.assign(this, model);
-    this.isEnabled = enabled;
+  @action
+  async importModel({ enabled, manifestPath, ...model }: ExtensionModel) {
+    try {
+      this.manifest = await readJsonSync(manifestPath, { throws: true })
+      this.manifestPath = manifestPath;
+      this.isEnabled = enabled;
+      Object.assign(this, model);
+      this.isReady = true;
+    } catch (err) {
+      logger.error(`[EXTENSION]: cannot read manifest at ${manifestPath}`, { ...model, err: String(err) })
+      this.disable();
+    }
   }
 
-  async init(){
+  async init() {
     // todo?
   }
 
@@ -46,10 +63,24 @@ export class LensExtension implements ExtensionModel {
   }
 
   async enable() {
+    this.isEnabled = true;
     // todo
   }
 
   async disable() {
+    this.isEnabled = false;
     // todo
   }
+
+  toJSON(): ExtensionModel {
+    return {
+      id: this.id,
+      name: this.name,
+      version: this.version,
+      description: this.description,
+      manifestPath: this.manifestPath,
+      enabled: this.isEnabled,
+      updateUrl: this.updateUrl,
+    }
+  }
 }