Persist auth data across restarts

src/node/persistence.js

@@ -0,0 +1,31 @@
+import { app } from 'electron'
+import { promises as fsPromises, stat } from 'fs'
+import path from 'path'
+import throttle from 'lodash/throttle'
+
+const stateFilePath = path.join(app.getPath('userData'), 'streamwall.json')
+
+let lastState = {}
+
+async function _save(partialState) {
+  const state = { ...lastState, ...partialState }
+  lastState = state
+  const data = JSON.stringify(state)
+  await fsPromises.writeFile(stateFilePath, data)
+}
+
+export const save = throttle(_save, 501)
+
+export async function load() {
+  try {
+    const data = await fsPromises.readFile(stateFilePath)
+    return JSON.parse(data)
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      // Ignore missing file.
+    } else {
+      console.warn('error reading persisted state:', err)
+    }
+    return {}
+  }
+}