init dataApi method test

browser/main/lib/dataApi/init.js

@@ -0,0 +1,77 @@
+'use strict'
+const _ = require('lodash')
+const sander = require('sander')
+const path = require('path')
+
+function init () {
+  let fetchStorages = function () {
+    let rawStorages
+    try {
+      rawStorages = JSON.parse(window.localStorage.getItem('storages'))
+      if (!_.isArray(rawStorages)) throw new Error('Cached data is not valid.')
+    } catch (e) {
+      console.error(e)
+      rawStorages = []
+      window.localStorage.setItem('storages', JSON.stringify(rawStorages))
+    }
+    return Promise.all(rawStorages
+      .map(function assignFoldersToStorage (rawStorage) {
+        let data
+        let boostnoteJSONPath = path.join(rawStorage.path, 'boostnote.json')
+        try {
+          data = JSON.parse(sander.readFileSync(boostnoteJSONPath))
+          if (!_.isArray(data.folders)) throw new Error('folders should be an array.')
+          rawStorage.folders = data.folders
+        } catch (err) {
+          if (err.code === 'ENOENT') {
+            console.warn('boostnote.json file doesn\'t exist the given path')
+          } else {
+            console.error(err)
+          }
+          rawStorage.folders = []
+        }
+        return Promise.resolve(rawStorage)
+      }))
+  }
+
+  let fetchNotes = function (storages) {
+    let notes = []
+
+    storages
+      .forEach((storage) => {
+        storage.folders.forEach((folder) => {
+          let dataPath = path.join(storage.path, folder.key, 'data.json')
+          let data
+          try {
+            data = JSON.parse(sander.readFileSync(dataPath))
+            if (!_.isArray(data.notes)) throw new Error('notes should be an array.')
+          } catch (e) {
+            // Remove folder if fetching failed.
+            console.error('Failed to load data: %s', dataPath)
+            storage.folders = storage.folders.filter((_folder) => _folder.key !== folder.key)
+            data = {notes: []}
+          }
+          data.notes.forEach((note) => {
+            note.storage = storage.key
+            note.folder = folder.key
+            notes.push(note)
+          })
+        })
+      })
+    return Promise.resolve({
+      storages,
+      notes
+    })
+  }
+
+  return Promise.resolve(fetchStorages())
+    .then((storages) => {
+      storages = storages.filter((storage) => {
+        if (!_.isObject(storage)) return false
+        return true
+      })
+      return storages
+    })
+    .then(fetchNotes)
+}
+module.exports = init