Restructure

src-electron/ipc/SettingsHandler.ipc.ts

@@ -0,0 +1,94 @@
+import * as fs from 'fs'
+import { promisify } from 'util'
+
+import { IPCEmitHandler, IPCInvokeHandler } from '../shared/IPCHandler'
+import { dataPath, settingsPath, tempPath, themesPath } from '../shared/Paths'
+import { defaultSettings, Settings } from '../shared/Settings'
+
+const exists = promisify(fs.exists)
+const mkdir = promisify(fs.mkdir)
+const readFile = promisify(fs.readFile)
+const writeFile = promisify(fs.writeFile)
+
+let settings: Settings
+
+/**
+ * Handles the 'set-settings' event.
+ */
+class SetSettingsHandler implements IPCEmitHandler<'set-settings'> {
+	event = 'set-settings' as const
+
+	/**
+	 * Updates Bridge's settings object to `newSettings` and saves them to Bridge's data directories.
+	 */
+	handler(newSettings: Settings) {
+		settings = newSettings
+		SetSettingsHandler.saveSettings(settings)
+	}
+
+	/**
+	 * Saves `settings` to Bridge's data directories.
+	 */
+	static async saveSettings(settings: Settings) {
+		const settingsJSON = JSON.stringify(settings, undefined, 2)
+		await writeFile(settingsPath, settingsJSON, 'utf8')
+	}
+}
+
+/**
+ * Handles the 'get-settings' event.
+ */
+class GetSettingsHandler implements IPCInvokeHandler<'get-settings'> {
+	event = 'get-settings' as const
+
+	/**
+	 * @returns the current settings oject, or default settings if they couldn't be loaded.
+	 */
+	handler() {
+		return this.getSettings()
+	}
+
+	/**
+	 * @returns the current settings oject, or default settings if they couldn't be loaded.
+	 */
+	getSettings() {
+		if (settings == undefined) {
+			return defaultSettings
+		} else {
+			return settings
+		}
+	}
+
+	/**
+	 * If data directories don't exist, creates them and saves the default settings.
+	 * Otherwise, loads user settings from data directories.
+	 * If this process fails, default settings are used.
+	 */
+	async initSettings() {
+		try {
+			// Create data directories if they don't exists
+			for (const path of [dataPath, tempPath, themesPath]) {
+				if (!await exists(path)) {
+					await mkdir(path)
+				}
+			}
+
+			// Read/create settings
+			if (await exists(settingsPath)) {
+				settings = JSON.parse(await readFile(settingsPath, 'utf8'))
+				settings = Object.assign(JSON.parse(JSON.stringify(defaultSettings)), settings)
+			} else {
+				await SetSettingsHandler.saveSettings(defaultSettings)
+				settings = defaultSettings
+			}
+		} catch (e) {
+			console.error('Failed to initialize settings! Default settings will be used.')
+			console.error(e)
+			settings = defaultSettings
+		}
+	}
+}
+
+export const getSettingsHandler = new GetSettingsHandler()
+export const setSettingsHandler = new SetSettingsHandler()
+export function getSettings() { return getSettingsHandler.getSettings() }