Improve child performances (#1314)

api/utils.js

@@ -0,0 +1,58 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+'use strict'
+
+const result = { body: null, statusCode: null, headers: null, warnings: null }
+const kConfigurationError = Symbol('configuration error')
+
+function handleError (err, callback) {
+  if (callback) {
+    process.nextTick(callback, err, result)
+    return { then: noop, catch: noop, abort: noop }
+  }
+  return Promise.reject(err)
+}
+
+function snakeCaseKeys (acceptedQuerystring, snakeCase, querystring) {
+  var target = {}
+  var keys = Object.keys(querystring)
+  for (var i = 0, len = keys.length; i < len; i++) {
+    var key = keys[i]
+    target[snakeCase[key] || key] = querystring[key]
+  }
+  return target
+}
+
+function normalizeArguments (params, options, callback) {
+  if (typeof options === 'function') {
+    callback = options
+    options = {}
+  }
+  if (typeof params === 'function' || params == null) {
+    callback = params
+    params = {}
+    options = {}
+  }
+  return [params, options, callback]
+}
+
+function noop () {}
+
+module.exports = { handleError, snakeCaseKeys, normalizeArguments, noop, kConfigurationError }