Various refactoring

src/electron/ipc/SettingsHandler.ipc.ts

@@ -0,0 +1,88 @@
+import { exists as _exists, mkdir as _mkdir, readFile as _readFile, writeFile as _writeFile } from 'fs'
+import { dataPath, tempPath, themesPath, settingsPath } from '../shared/Paths'
+import { promisify } from 'util'
+import { IPCInvokeHandler, IPCEmitHandler } from '../shared/IPCHandler'
+import { defaultSettings, Settings } from '../shared/Settings'
+
+const exists = promisify(_exists)
+const mkdir = promisify(_mkdir)
+const readFile = promisify(_readFile)
+const writeFile = promisify(_writeFile)
+
+let settings: Settings
+
+/**
+ * Handles the 'get-settings' event.
+ */
+export class GetSettingsHandler implements IPCInvokeHandler<'get-settings'> {
+  event: 'get-settings' = 'get-settings'
+
+  /**
+   * @returns the current settings oject, or default settings if they couldn't be loaded.
+   */
+  handler() {
+    return GetSettingsHandler.getSettings()
+  }
+
+  /**
+   * @returns the current settings oject, or default settings if they couldn't be loaded.
+   */
+  static 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.
+   */
+  static 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'))
+      } 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
+    }
+  }
+}
+
+/**
+ * Handles the 'set-settings' event.
+ */
+export class SetSettingsHandler implements IPCEmitHandler<'set-settings'> {
+  event: 'set-settings' = 'set-settings'
+
+  /**
+   * 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')
+  }
+}