feat: utils for properly getting Datastore and its options

Author: AuHau

src/migration-templates.js

@@ -3,11 +3,12 @@
 module.exports = {
   indexJs: `'use strict'
 
-const Datastore = require('datastore-fs')
-const log = require('debug')('jsipfs-repo-migrations:migration-{{version}}')
+const utils = require('../../src/utils')
+const log = require('debug')('repo-migrations:migration-{{version}}')
 
 async function migrate(repoPath, options, isBrowser) {
-  const store = new Datastore(repoPath, {extension: '', createIfMissing: false})
+  const { StorageBackend, storageOptions } = utils.getDatastoreAndOptions(options, 'root')
+  const store = new StorageBackend(repoPath, storageOptions)
   store.open()
 
   try {
@@ -18,7 +19,8 @@ async function migrate(repoPath, options, isBrowser) {
 }
 
 async function revert(repoPath, options, isBrowser) {
-  const store = new Datastore(repoPath, {extension: '', createIfMissing: false})
+  const { StorageBackend, storageOptions } = utils.getDatastoreAndOptions(options, 'root')
+  const store = new StorageBackend(repoPath, storageOptions)
   store.open()
 
   try {

src/utils.js

@@ -0,0 +1,29 @@
+'use strict'
+
+const Datastore = require('datastore-fs')
+
+exports.getDatastoreAndOptions = function getDatastoreAndOptions(options, key, defaultDatastore = Datastore) {
+  let StorageBackend, storageBackendOptions
+  if (options !== undefined
+    && options['storageBackends'] !== undefined
+    && options['storageBackends'][key] !== undefined
+  ) {
+    StorageBackend = options['storageBackends'][key]
+  } else {
+    StorageBackend = defaultDatastore
+  }
+
+  if (options !== undefined
+    && options['storageBackendOptions'] !== undefined
+    && options['storageBackendOptions'][key] !== undefined
+  ) {
+    storageBackendOptions = options['storageBackendOptions'][key]
+  } else {
+    storageBackendOptions = {}
+  }
+
+  return {
+    StorageBackend: StorageBackend,
+    storageOptions: storageBackendOptions
+  }
+}