зеркало из https://github.com/mozilla/gecko-dev.git
2642 строки
102 KiB
JavaScript
2642 строки
102 KiB
JavaScript
/*
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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"use strict";
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/*
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* This file is generated from kinto.js - do not modify directly.
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*/
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// This is required because with Babel compiles ES2015 modules into a
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// require() form that tries to keep its modules on "this", but
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// doesn't specify "this", leaving it to default to the global
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// object. However, in strict mode, "this" no longer defaults to the
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// global object, so expose the global object explicitly. Babel's
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// compiled output will use a variable called "global" if one is
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// present.
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//
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// See https://bugzilla.mozilla.org/show_bug.cgi?id=1394556#c3 for
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// more details.
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const global = this;
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var EXPORTED_SYMBOLS = ["Kinto"];
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/*
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* Version 13.0.0 - 7fbf95d
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*/
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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typeof define === 'function' && define.amd ? define(factory) :
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(global = global || self, global.Kinto = factory());
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}(this, (function () { 'use strict';
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/**
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* Base db adapter.
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*
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* @abstract
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*/
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class BaseAdapter {
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/**
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* Deletes every records present in the database.
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*
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* @abstract
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* @return {Promise}
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*/
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clear() {
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throw new Error("Not Implemented.");
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}
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/**
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* Executes a batch of operations within a single transaction.
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*
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* @abstract
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* @param {Function} callback The operation callback.
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* @param {Object} options The options object.
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* @return {Promise}
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*/
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execute(callback, options = { preload: [] }) {
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throw new Error("Not Implemented.");
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}
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/**
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* Retrieve a record by its primary key from the database.
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*
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* @abstract
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* @param {String} id The record id.
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* @return {Promise}
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*/
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get(id) {
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throw new Error("Not Implemented.");
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}
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/**
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* Lists all records from the database.
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*
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* @abstract
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* @param {Object} params The filters and order to apply to the results.
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* @return {Promise}
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*/
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list(params = { filters: {}, order: "" }) {
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throw new Error("Not Implemented.");
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}
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/**
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* Store the lastModified value.
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*
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* @abstract
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* @param {Number} lastModified
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* @return {Promise}
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*/
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saveLastModified(lastModified) {
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throw new Error("Not Implemented.");
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}
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/**
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* Retrieve saved lastModified value.
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*
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* @abstract
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* @return {Promise}
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*/
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getLastModified() {
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throw new Error("Not Implemented.");
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}
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/**
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* Load records in bulk that were exported from a server.
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*
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* @abstract
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* @param {Array} records The records to load.
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* @return {Promise}
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*/
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importBulk(records) {
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throw new Error("Not Implemented.");
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}
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/**
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* Load a dump of records exported from a server.
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*
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* @deprecated Use {@link importBulk} instead.
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* @abstract
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* @param {Array} records The records to load.
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* @return {Promise}
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*/
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loadDump(records) {
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throw new Error("Not Implemented.");
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}
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saveMetadata(metadata) {
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throw new Error("Not Implemented.");
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}
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getMetadata() {
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throw new Error("Not Implemented.");
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}
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}
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const RE_RECORD_ID = /^[a-zA-Z0-9][a-zA-Z0-9_-]*$/;
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/**
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* Checks if a value is undefined.
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* @param {Any} value
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* @return {Boolean}
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*/
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function _isUndefined(value) {
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return typeof value === "undefined";
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}
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/**
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* Sorts records in a list according to a given ordering.
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*
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* @param {String} order The ordering, eg. `-last_modified`.
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* @param {Array} list The collection to order.
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* @return {Array}
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*/
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function sortObjects(order, list) {
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const hasDash = order[0] === "-";
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const field = hasDash ? order.slice(1) : order;
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const direction = hasDash ? -1 : 1;
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return list.slice().sort((a, b) => {
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if (a[field] && _isUndefined(b[field])) {
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return direction;
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}
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if (b[field] && _isUndefined(a[field])) {
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return -direction;
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}
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if (_isUndefined(a[field]) && _isUndefined(b[field])) {
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return 0;
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}
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return a[field] > b[field] ? direction : -direction;
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});
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}
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/**
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* Test if a single object matches all given filters.
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*
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* @param {Object} filters The filters object.
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* @param {Object} entry The object to filter.
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* @return {Boolean}
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*/
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function filterObject(filters, entry) {
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return Object.keys(filters).every(filter => {
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const value = filters[filter];
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if (Array.isArray(value)) {
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return value.some(candidate => candidate === entry[filter]);
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}
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else if (typeof value === "object") {
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return filterObject(value, entry[filter]);
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}
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else if (!Object.prototype.hasOwnProperty.call(entry, filter)) {
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console.error(`The property ${filter} does not exist`);
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return false;
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}
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return entry[filter] === value;
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});
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}
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/**
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* Resolves a list of functions sequentially, which can be sync or async; in
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* case of async, functions must return a promise.
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*
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* @param {Array} fns The list of functions.
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* @param {Any} init The initial value.
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* @return {Promise}
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*/
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function waterfall(fns, init) {
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if (!fns.length) {
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return Promise.resolve(init);
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}
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return fns.reduce((promise, nextFn) => {
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return promise.then(nextFn);
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}, Promise.resolve(init));
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}
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/**
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* Simple deep object comparison function. This only supports comparison of
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* serializable JavaScript objects.
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*
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* @param {Object} a The source object.
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* @param {Object} b The compared object.
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* @return {Boolean}
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*/
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function deepEqual(a, b) {
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if (a === b) {
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return true;
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}
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if (typeof a !== typeof b) {
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return false;
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}
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if (!(a && typeof a == "object") || !(b && typeof b == "object")) {
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return false;
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}
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if (Object.keys(a).length !== Object.keys(b).length) {
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return false;
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}
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for (const k in a) {
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if (!deepEqual(a[k], b[k])) {
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return false;
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}
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}
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return true;
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}
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/**
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* Return an object without the specified keys.
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*
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* @param {Object} obj The original object.
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* @param {Array} keys The list of keys to exclude.
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* @return {Object} A copy without the specified keys.
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*/
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function omitKeys(obj, keys = []) {
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const result = Object.assign({}, obj);
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for (const key of keys) {
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delete result[key];
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}
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return result;
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}
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function arrayEqual(a, b) {
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if (a.length !== b.length) {
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return false;
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}
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for (let i = a.length; i--;) {
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if (a[i] !== b[i]) {
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return false;
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}
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}
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return true;
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}
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function makeNestedObjectFromArr(arr, val, nestedFiltersObj) {
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const last = arr.length - 1;
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return arr.reduce((acc, cv, i) => {
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if (i === last) {
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return (acc[cv] = val);
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}
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else if (Object.prototype.hasOwnProperty.call(acc, cv)) {
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return acc[cv];
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}
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else {
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return (acc[cv] = {});
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}
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}, nestedFiltersObj);
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}
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function transformSubObjectFilters(filtersObj) {
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const transformedFilters = {};
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for (const key in filtersObj) {
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const keysArr = key.split(".");
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const val = filtersObj[key];
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makeNestedObjectFromArr(keysArr, val, transformedFilters);
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}
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return transformedFilters;
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}
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const INDEXED_FIELDS = ["id", "_status", "last_modified"];
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/**
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* Small helper that wraps the opening of an IndexedDB into a Promise.
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*
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* @param dbname {String} The database name.
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* @param version {Integer} Schema version
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* @param onupgradeneeded {Function} The callback to execute if schema is
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* missing or different.
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* @return {Promise<IDBDatabase>}
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*/
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async function open(dbname, { version, onupgradeneeded }) {
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return new Promise((resolve, reject) => {
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const request = indexedDB.open(dbname, version);
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request.onupgradeneeded = event => {
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const db = event.target.result;
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db.onerror = event => reject(event.target.error);
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// When an upgrade is needed, a transaction is started.
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const transaction = event.target.transaction;
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transaction.onabort = event => {
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const error = event.target.error ||
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transaction.error ||
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new DOMException("The operation has been aborted", "AbortError");
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reject(error);
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};
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// Callback for store creation etc.
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return onupgradeneeded(event);
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};
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request.onerror = event => {
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reject(event.target.error);
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};
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request.onsuccess = event => {
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const db = event.target.result;
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resolve(db);
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};
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});
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}
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/**
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* Helper to run the specified callback in a single transaction on the
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* specified store.
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* The helper focuses on transaction wrapping into a promise.
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*
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* @param db {IDBDatabase} The database instance.
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* @param name {String} The store name.
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* @param callback {Function} The piece of code to execute in the transaction.
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* @param options {Object} Options.
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* @param options.mode {String} Transaction mode (default: read).
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* @return {Promise} any value returned by the callback.
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*/
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async function execute(db, name, callback, options = {}) {
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const { mode } = options;
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return new Promise((resolve, reject) => {
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// On Safari, calling IDBDatabase.transaction with mode == undefined raises
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// a TypeError.
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const transaction = mode
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? db.transaction([name], mode)
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: db.transaction([name]);
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const store = transaction.objectStore(name);
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// Let the callback abort this transaction.
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const abort = e => {
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transaction.abort();
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reject(e);
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};
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// Execute the specified callback **synchronously**.
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let result;
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try {
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result = callback(store, abort);
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}
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catch (e) {
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abort(e);
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}
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transaction.onerror = event => reject(event.target.error);
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transaction.oncomplete = event => resolve(result);
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transaction.onabort = event => {
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const error = event.target.error ||
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transaction.error ||
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new DOMException("The operation has been aborted", "AbortError");
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reject(error);
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};
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});
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}
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/**
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* Helper to wrap the deletion of an IndexedDB database into a promise.
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*
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* @param dbName {String} the database to delete
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* @return {Promise}
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*/
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async function deleteDatabase(dbName) {
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return new Promise((resolve, reject) => {
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const request = indexedDB.deleteDatabase(dbName);
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request.onsuccess = event => resolve(event.target);
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request.onerror = event => reject(event.target.error);
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});
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}
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/**
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* IDB cursor handlers.
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* @type {Object}
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*/
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const cursorHandlers = {
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all(filters, done) {
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const results = [];
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return event => {
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const cursor = event.target.result;
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if (cursor) {
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const { value } = cursor;
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if (filterObject(filters, value)) {
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results.push(value);
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}
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cursor.continue();
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}
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else {
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done(results);
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}
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};
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},
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in(values, filters, done) {
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const results = [];
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let i = 0;
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return function (event) {
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const cursor = event.target.result;
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if (!cursor) {
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done(results);
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return;
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}
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const { key, value } = cursor;
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// `key` can be an array of two values (see `keyPath` in indices definitions).
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// `values` can be an array of arrays if we filter using an index whose key path
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// is an array (eg. `cursorHandlers.in([["bid/cid", 42], ["bid/cid", 43]], ...)`)
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while (key > values[i]) {
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// The cursor has passed beyond this key. Check next.
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++i;
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if (i === values.length) {
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done(results); // There is no next. Stop searching.
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return;
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}
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}
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const isEqual = Array.isArray(key)
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? arrayEqual(key, values[i])
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: key === values[i];
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if (isEqual) {
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if (filterObject(filters, value)) {
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results.push(value);
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}
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cursor.continue();
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}
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else {
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cursor.continue(values[i]);
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}
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};
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},
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};
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/**
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* Creates an IDB request and attach it the appropriate cursor event handler to
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* perform a list query.
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*
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* Multiple matching values are handled by passing an array.
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*
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* @param {String} cid The collection id (ie. `{bid}/{cid}`)
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* @param {IDBStore} store The IDB store.
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* @param {Object} filters Filter the records by field.
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* @param {Function} done The operation completion handler.
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* @return {IDBRequest}
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*/
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function createListRequest(cid, store, filters, done) {
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const filterFields = Object.keys(filters);
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// If no filters, get all results in one bulk.
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if (filterFields.length == 0) {
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const request = store.index("cid").getAll(IDBKeyRange.only(cid));
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request.onsuccess = event => done(event.target.result);
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return request;
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}
|
||
// Introspect filters and check if they leverage an indexed field.
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const indexField = filterFields.find(field => {
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return INDEXED_FIELDS.includes(field);
|
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});
|
||
if (!indexField) {
|
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// Iterate on all records for this collection (ie. cid)
|
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const isSubQuery = Object.keys(filters).some(key => key.includes(".")); // (ie. filters: {"article.title": "hello"})
|
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if (isSubQuery) {
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const newFilter = transformSubObjectFilters(filters);
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const request = store.index("cid").openCursor(IDBKeyRange.only(cid));
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request.onsuccess = cursorHandlers.all(newFilter, done);
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return request;
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||
}
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const request = store.index("cid").openCursor(IDBKeyRange.only(cid));
|
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request.onsuccess = cursorHandlers.all(filters, done);
|
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return request;
|
||
}
|
||
// If `indexField` was used already, don't filter again.
|
||
const remainingFilters = omitKeys(filters, [indexField]);
|
||
// value specified in the filter (eg. `filters: { _status: ["created", "updated"] }`)
|
||
const value = filters[indexField];
|
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// For the "id" field, use the primary key.
|
||
const indexStore = indexField == "id" ? store : store.index(indexField);
|
||
// WHERE IN equivalent clause
|
||
if (Array.isArray(value)) {
|
||
if (value.length === 0) {
|
||
return done([]);
|
||
}
|
||
const values = value.map(i => [cid, i]).sort();
|
||
const range = IDBKeyRange.bound(values[0], values[values.length - 1]);
|
||
const request = indexStore.openCursor(range);
|
||
request.onsuccess = cursorHandlers.in(values, remainingFilters, done);
|
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return request;
|
||
}
|
||
// If no filters on custom attribute, get all results in one bulk.
|
||
if (remainingFilters.length == 0) {
|
||
const request = indexStore.getAll(IDBKeyRange.only([cid, value]));
|
||
request.onsuccess = event => done(event.target.result);
|
||
return request;
|
||
}
|
||
// WHERE field = value clause
|
||
const request = indexStore.openCursor(IDBKeyRange.only([cid, value]));
|
||
request.onsuccess = cursorHandlers.all(remainingFilters, done);
|
||
return request;
|
||
}
|
||
class IDBError extends Error {
|
||
constructor(method, err) {
|
||
super(`IndexedDB ${method}() ${err.message}`);
|
||
this.name = err.name;
|
||
this.stack = err.stack;
|
||
}
|
||
}
|
||
/**
|
||
* IndexedDB adapter.
|
||
*
|
||
* This adapter doesn't support any options.
|
||
*/
|
||
class IDB extends BaseAdapter {
|
||
/* Expose the IDBError class publicly */
|
||
static get IDBError() {
|
||
return IDBError;
|
||
}
|
||
/**
|
||
* Constructor.
|
||
*
|
||
* @param {String} cid The key base for this collection (eg. `bid/cid`)
|
||
* @param {Object} options
|
||
* @param {String} options.dbName The IndexedDB name (default: `"KintoDB"`)
|
||
* @param {String} options.migrateOldData Whether old database data should be migrated (default: `false`)
|
||
*/
|
||
constructor(cid, options = {}) {
|
||
super();
|
||
this.cid = cid;
|
||
this.dbName = options.dbName || "KintoDB";
|
||
this._options = options;
|
||
this._db = null;
|
||
}
|
||
_handleError(method, err) {
|
||
throw new IDBError(method, err);
|
||
}
|
||
/**
|
||
* Ensures a connection to the IndexedDB database has been opened.
|
||
*
|
||
* @override
|
||
* @return {Promise}
|
||
*/
|
||
async open() {
|
||
if (this._db) {
|
||
return this;
|
||
}
|
||
// In previous versions, we used to have a database with name `${bid}/${cid}`.
|
||
// Check if it exists, and migrate data once new schema is in place.
|
||
// Note: the built-in migrations from IndexedDB can only be used if the
|
||
// database name does not change.
|
||
const dataToMigrate = this._options.migrateOldData
|
||
? await migrationRequired(this.cid)
|
||
: null;
|
||
this._db = await open(this.dbName, {
|
||
version: 2,
|
||
onupgradeneeded: event => {
|
||
const db = event.target.result;
|
||
if (event.oldVersion < 1) {
|
||
// Records store
|
||
const recordsStore = db.createObjectStore("records", {
|
||
keyPath: ["_cid", "id"],
|
||
});
|
||
// An index to obtain all the records in a collection.
|
||
recordsStore.createIndex("cid", "_cid");
|
||
// Here we create indices for every known field in records by collection.
|
||
// Local record status ("synced", "created", "updated", "deleted")
|
||
recordsStore.createIndex("_status", ["_cid", "_status"]);
|
||
// Last modified field
|
||
recordsStore.createIndex("last_modified", ["_cid", "last_modified"]);
|
||
// Timestamps store
|
||
db.createObjectStore("timestamps", {
|
||
keyPath: "cid",
|
||
});
|
||
}
|
||
if (event.oldVersion < 2) {
|
||
// Collections store
|
||
db.createObjectStore("collections", {
|
||
keyPath: "cid",
|
||
});
|
||
}
|
||
},
|
||
});
|
||
if (dataToMigrate) {
|
||
const { records, timestamp } = dataToMigrate;
|
||
await this.importBulk(records);
|
||
await this.saveLastModified(timestamp);
|
||
console.log(`${this.cid}: data was migrated successfully.`);
|
||
// Delete the old database.
|
||
await deleteDatabase(this.cid);
|
||
console.warn(`${this.cid}: old database was deleted.`);
|
||
}
|
||
return this;
|
||
}
|
||
/**
|
||
* Closes current connection to the database.
|
||
*
|
||
* @override
|
||
* @return {Promise}
|
||
*/
|
||
close() {
|
||
if (this._db) {
|
||
this._db.close(); // indexedDB.close is synchronous
|
||
this._db = null;
|
||
}
|
||
return Promise.resolve();
|
||
}
|
||
/**
|
||
* Returns a transaction and an object store for a store name.
|
||
*
|
||
* To determine if a transaction has completed successfully, we should rather
|
||
* listen to the transaction’s complete event rather than the IDBObjectStore
|
||
* request’s success event, because the transaction may still fail after the
|
||
* success event fires.
|
||
*
|
||
* @param {String} name Store name
|
||
* @param {Function} callback to execute
|
||
* @param {Object} options Options
|
||
* @param {String} options.mode Transaction mode ("readwrite" or undefined)
|
||
* @return {Object}
|
||
*/
|
||
async prepare(name, callback, options) {
|
||
await this.open();
|
||
await execute(this._db, name, callback, options);
|
||
}
|
||
/**
|
||
* Deletes every records in the current collection.
|
||
*
|
||
* @override
|
||
* @return {Promise}
|
||
*/
|
||
async clear() {
|
||
try {
|
||
await this.prepare("records", store => {
|
||
const range = IDBKeyRange.only(this.cid);
|
||
const request = store.index("cid").openKeyCursor(range);
|
||
request.onsuccess = event => {
|
||
const cursor = event.target.result;
|
||
if (cursor) {
|
||
store.delete(cursor.primaryKey);
|
||
cursor.continue();
|
||
}
|
||
};
|
||
return request;
|
||
}, { mode: "readwrite" });
|
||
}
|
||
catch (e) {
|
||
this._handleError("clear", e);
|
||
}
|
||
}
|
||
/**
|
||
* Executes the set of synchronous CRUD operations described in the provided
|
||
* callback within an IndexedDB transaction, for current db store.
|
||
*
|
||
* The callback will be provided an object exposing the following synchronous
|
||
* CRUD operation methods: get, create, update, delete.
|
||
*
|
||
* Important note: because limitations in IndexedDB implementations, no
|
||
* asynchronous code should be performed within the provided callback; the
|
||
* promise will therefore be rejected if the callback returns a Promise.
|
||
*
|
||
* Options:
|
||
* - {Array} preload: The list of record IDs to fetch and make available to
|
||
* the transaction object get() method (default: [])
|
||
*
|
||
* @example
|
||
* const db = new IDB("example");
|
||
* const result = await db.execute(transaction => {
|
||
* transaction.create({id: 1, title: "foo"});
|
||
* transaction.update({id: 2, title: "bar"});
|
||
* transaction.delete(3);
|
||
* return "foo";
|
||
* });
|
||
*
|
||
* @override
|
||
* @param {Function} callback The operation description callback.
|
||
* @param {Object} options The options object.
|
||
* @return {Promise}
|
||
*/
|
||
async execute(callback, options = { preload: [] }) {
|
||
// Transactions in IndexedDB are autocommited when a callback does not
|
||
// perform any additional operation.
|
||
// The way Promises are implemented in Firefox (see https://bugzilla.mozilla.org/show_bug.cgi?id=1193394)
|
||
// prevents using within an opened transaction.
|
||
// To avoid managing asynchronocity in the specified `callback`, we preload
|
||
// a list of record in order to execute the `callback` synchronously.
|
||
// See also:
|
||
// - http://stackoverflow.com/a/28388805/330911
|
||
// - http://stackoverflow.com/a/10405196
|
||
// - https://jakearchibald.com/2015/tasks-microtasks-queues-and-schedules/
|
||
let result;
|
||
await this.prepare("records", (store, abort) => {
|
||
const runCallback = (preloaded = []) => {
|
||
// Expose a consistent API for every adapter instead of raw store methods.
|
||
const proxy = transactionProxy(this, store, preloaded);
|
||
// The callback is executed synchronously within the same transaction.
|
||
try {
|
||
const returned = callback(proxy);
|
||
if (returned instanceof Promise) {
|
||
// XXX: investigate how to provide documentation details in error.
|
||
throw new Error("execute() callback should not return a Promise.");
|
||
}
|
||
// Bring to scope that will be returned (once promise awaited).
|
||
result = returned;
|
||
}
|
||
catch (e) {
|
||
// The callback has thrown an error explicitly. Abort transaction cleanly.
|
||
abort(e);
|
||
}
|
||
};
|
||
// No option to preload records, go straight to `callback`.
|
||
if (!options.preload.length) {
|
||
return runCallback();
|
||
}
|
||
// Preload specified records using a list request.
|
||
const filters = { id: options.preload };
|
||
createListRequest(this.cid, store, filters, records => {
|
||
// Store obtained records by id.
|
||
const preloaded = {};
|
||
for (const record of records) {
|
||
delete record["_cid"];
|
||
preloaded[record.id] = record;
|
||
}
|
||
runCallback(preloaded);
|
||
});
|
||
}, { mode: "readwrite" });
|
||
return result;
|
||
}
|
||
/**
|
||
* Retrieve a record by its primary key from the IndexedDB database.
|
||
*
|
||
* @override
|
||
* @param {String} id The record id.
|
||
* @return {Promise}
|
||
*/
|
||
async get(id) {
|
||
try {
|
||
let record;
|
||
await this.prepare("records", store => {
|
||
store.get([this.cid, id]).onsuccess = e => (record = e.target.result);
|
||
});
|
||
return record;
|
||
}
|
||
catch (e) {
|
||
this._handleError("get", e);
|
||
}
|
||
}
|
||
/**
|
||
* Lists all records from the IndexedDB database.
|
||
*
|
||
* @override
|
||
* @param {Object} params The filters and order to apply to the results.
|
||
* @return {Promise}
|
||
*/
|
||
async list(params = { filters: {} }) {
|
||
const { filters } = params;
|
||
try {
|
||
let results = [];
|
||
await this.prepare("records", store => {
|
||
createListRequest(this.cid, store, filters, _results => {
|
||
// we have received all requested records that match the filters,
|
||
// we now park them within current scope and hide the `_cid` attribute.
|
||
for (const result of _results) {
|
||
delete result["_cid"];
|
||
}
|
||
results = _results;
|
||
});
|
||
});
|
||
// The resulting list of records is sorted.
|
||
// XXX: with some efforts, this could be fully implemented using IDB API.
|
||
return params.order ? sortObjects(params.order, results) : results;
|
||
}
|
||
catch (e) {
|
||
this._handleError("list", e);
|
||
}
|
||
}
|
||
/**
|
||
* Store the lastModified value into metadata store.
|
||
*
|
||
* @override
|
||
* @param {Number} lastModified
|
||
* @return {Promise}
|
||
*/
|
||
async saveLastModified(lastModified) {
|
||
const value = parseInt(lastModified, 10) || null;
|
||
try {
|
||
await this.prepare("timestamps", store => {
|
||
if (value === null) {
|
||
store.delete(this.cid);
|
||
}
|
||
else {
|
||
store.put({ cid: this.cid, value });
|
||
}
|
||
}, { mode: "readwrite" });
|
||
return value;
|
||
}
|
||
catch (e) {
|
||
this._handleError("saveLastModified", e);
|
||
}
|
||
}
|
||
/**
|
||
* Retrieve saved lastModified value.
|
||
*
|
||
* @override
|
||
* @return {Promise}
|
||
*/
|
||
async getLastModified() {
|
||
try {
|
||
let entry = null;
|
||
await this.prepare("timestamps", store => {
|
||
store.get(this.cid).onsuccess = e => (entry = e.target.result);
|
||
});
|
||
return entry ? entry.value : null;
|
||
}
|
||
catch (e) {
|
||
this._handleError("getLastModified", e);
|
||
}
|
||
}
|
||
/**
|
||
* Load a dump of records exported from a server.
|
||
*
|
||
* @deprecated Use {@link importBulk} instead.
|
||
* @abstract
|
||
* @param {Array} records The records to load.
|
||
* @return {Promise}
|
||
*/
|
||
async loadDump(records) {
|
||
return this.importBulk(records);
|
||
}
|
||
/**
|
||
* Load records in bulk that were exported from a server.
|
||
*
|
||
* @abstract
|
||
* @param {Array} records The records to load.
|
||
* @return {Promise}
|
||
*/
|
||
async importBulk(records) {
|
||
try {
|
||
await this.execute(transaction => {
|
||
// Since the put operations are asynchronous, we chain
|
||
// them together. The last one will be waited for the
|
||
// `transaction.oncomplete` callback. (see #execute())
|
||
let i = 0;
|
||
putNext();
|
||
function putNext() {
|
||
if (i == records.length) {
|
||
return;
|
||
}
|
||
// On error, `transaction.onerror` is called.
|
||
transaction.update(records[i]).onsuccess = putNext;
|
||
++i;
|
||
}
|
||
});
|
||
const previousLastModified = await this.getLastModified();
|
||
const lastModified = Math.max(...records.map(record => record.last_modified));
|
||
if (lastModified > previousLastModified) {
|
||
await this.saveLastModified(lastModified);
|
||
}
|
||
return records;
|
||
}
|
||
catch (e) {
|
||
this._handleError("importBulk", e);
|
||
}
|
||
}
|
||
async saveMetadata(metadata) {
|
||
try {
|
||
await this.prepare("collections", store => store.put({ cid: this.cid, metadata }), { mode: "readwrite" });
|
||
return metadata;
|
||
}
|
||
catch (e) {
|
||
this._handleError("saveMetadata", e);
|
||
}
|
||
}
|
||
async getMetadata() {
|
||
try {
|
||
let entry = null;
|
||
await this.prepare("collections", store => {
|
||
store.get(this.cid).onsuccess = e => (entry = e.target.result);
|
||
});
|
||
return entry ? entry.metadata : null;
|
||
}
|
||
catch (e) {
|
||
this._handleError("getMetadata", e);
|
||
}
|
||
}
|
||
}
|
||
/**
|
||
* IDB transaction proxy.
|
||
*
|
||
* @param {IDB} adapter The call IDB adapter
|
||
* @param {IDBStore} store The IndexedDB database store.
|
||
* @param {Array} preloaded The list of records to make available to
|
||
* get() (default: []).
|
||
* @return {Object}
|
||
*/
|
||
function transactionProxy(adapter, store, preloaded = []) {
|
||
const _cid = adapter.cid;
|
||
return {
|
||
create(record) {
|
||
store.add(Object.assign(Object.assign({}, record), { _cid }));
|
||
},
|
||
update(record) {
|
||
return store.put(Object.assign(Object.assign({}, record), { _cid }));
|
||
},
|
||
delete(id) {
|
||
store.delete([_cid, id]);
|
||
},
|
||
get(id) {
|
||
return preloaded[id];
|
||
},
|
||
};
|
||
}
|
||
/**
|
||
* Up to version 10.X of kinto.js, each collection had its own collection.
|
||
* The database name was `${bid}/${cid}` (eg. `"blocklists/certificates"`)
|
||
* and contained only one store with the same name.
|
||
*/
|
||
async function migrationRequired(dbName) {
|
||
let exists = true;
|
||
const db = await open(dbName, {
|
||
version: 1,
|
||
onupgradeneeded: event => {
|
||
exists = false;
|
||
},
|
||
});
|
||
// Check that the DB we're looking at is really a legacy one,
|
||
// and not some remainder of the open() operation above.
|
||
exists &=
|
||
db.objectStoreNames.contains("__meta__") &&
|
||
db.objectStoreNames.contains(dbName);
|
||
if (!exists) {
|
||
db.close();
|
||
// Testing the existence creates it, so delete it :)
|
||
await deleteDatabase(dbName);
|
||
return null;
|
||
}
|
||
console.warn(`${dbName}: old IndexedDB database found.`);
|
||
try {
|
||
// Scan all records.
|
||
let records;
|
||
await execute(db, dbName, store => {
|
||
store.openCursor().onsuccess = cursorHandlers.all({}, res => (records = res));
|
||
});
|
||
console.log(`${dbName}: found ${records.length} records.`);
|
||
// Check if there's a entry for this.
|
||
let timestamp = null;
|
||
await execute(db, "__meta__", store => {
|
||
store.get(`${dbName}-lastModified`).onsuccess = e => {
|
||
timestamp = e.target.result ? e.target.result.value : null;
|
||
};
|
||
});
|
||
// Some previous versions, also used to store the timestamps without prefix.
|
||
if (!timestamp) {
|
||
await execute(db, "__meta__", store => {
|
||
store.get("lastModified").onsuccess = e => {
|
||
timestamp = e.target.result ? e.target.result.value : null;
|
||
};
|
||
});
|
||
}
|
||
console.log(`${dbName}: ${timestamp ? "found" : "no"} timestamp.`);
|
||
// Those will be inserted in the new database/schema.
|
||
return { records, timestamp };
|
||
}
|
||
catch (e) {
|
||
console.error("Error occured during migration", e);
|
||
return null;
|
||
}
|
||
finally {
|
||
db.close();
|
||
}
|
||
}
|
||
|
||
var uuid4 = {};
|
||
|
||
const RECORD_FIELDS_TO_CLEAN = ["_status"];
|
||
const AVAILABLE_HOOKS = ["incoming-changes"];
|
||
const IMPORT_CHUNK_SIZE = 200;
|
||
/**
|
||
* Compare two records omitting local fields and synchronization
|
||
* attributes (like _status and last_modified)
|
||
* @param {Object} a A record to compare.
|
||
* @param {Object} b A record to compare.
|
||
* @param {Array} localFields Additional fields to ignore during the comparison
|
||
* @return {boolean}
|
||
*/
|
||
function recordsEqual(a, b, localFields = []) {
|
||
const fieldsToClean = RECORD_FIELDS_TO_CLEAN.concat(["last_modified"]).concat(localFields);
|
||
const cleanLocal = r => omitKeys(r, fieldsToClean);
|
||
return deepEqual(cleanLocal(a), cleanLocal(b));
|
||
}
|
||
/**
|
||
* Synchronization result object.
|
||
*/
|
||
class SyncResultObject {
|
||
/**
|
||
* Public constructor.
|
||
*/
|
||
constructor() {
|
||
/**
|
||
* Current synchronization result status; becomes `false` when conflicts or
|
||
* errors are registered.
|
||
* @type {Boolean}
|
||
*/
|
||
this.lastModified = null;
|
||
this._lists = {};
|
||
[
|
||
"errors",
|
||
"created",
|
||
"updated",
|
||
"deleted",
|
||
"published",
|
||
"conflicts",
|
||
"skipped",
|
||
"resolved",
|
||
"void",
|
||
].forEach(l => (this._lists[l] = []));
|
||
this._cached = {};
|
||
}
|
||
/**
|
||
* Adds entries for a given result type.
|
||
*
|
||
* @param {String} type The result type.
|
||
* @param {Array} entries The result entries.
|
||
* @return {SyncResultObject}
|
||
*/
|
||
add(type, entries) {
|
||
if (!Array.isArray(this._lists[type])) {
|
||
console.warn(`Unknown type "${type}"`);
|
||
return;
|
||
}
|
||
if (!Array.isArray(entries)) {
|
||
entries = [entries];
|
||
}
|
||
this._lists[type] = this._lists[type].concat(entries);
|
||
delete this._cached[type];
|
||
return this;
|
||
}
|
||
get ok() {
|
||
return this.errors.length + this.conflicts.length === 0;
|
||
}
|
||
get errors() {
|
||
return this._lists["errors"];
|
||
}
|
||
get conflicts() {
|
||
return this._lists["conflicts"];
|
||
}
|
||
get skipped() {
|
||
return this._deduplicate("skipped");
|
||
}
|
||
get resolved() {
|
||
return this._deduplicate("resolved");
|
||
}
|
||
get created() {
|
||
return this._deduplicate("created");
|
||
}
|
||
get updated() {
|
||
return this._deduplicate("updated");
|
||
}
|
||
get deleted() {
|
||
return this._deduplicate("deleted");
|
||
}
|
||
get published() {
|
||
return this._deduplicate("published");
|
||
}
|
||
_deduplicate(list) {
|
||
if (!(list in this._cached)) {
|
||
// Deduplicate entries by id. If the values don't have `id` attribute, just
|
||
// keep all.
|
||
const recordsWithoutId = new Set();
|
||
const recordsById = new Map();
|
||
this._lists[list].forEach(record => {
|
||
if (!record.id) {
|
||
recordsWithoutId.add(record);
|
||
}
|
||
else {
|
||
recordsById.set(record.id, record);
|
||
}
|
||
});
|
||
this._cached[list] = Array.from(recordsById.values()).concat(Array.from(recordsWithoutId));
|
||
}
|
||
return this._cached[list];
|
||
}
|
||
/**
|
||
* Reinitializes result entries for a given result type.
|
||
*
|
||
* @param {String} type The result type.
|
||
* @return {SyncResultObject}
|
||
*/
|
||
reset(type) {
|
||
this._lists[type] = [];
|
||
delete this._cached[type];
|
||
return this;
|
||
}
|
||
toObject() {
|
||
// Only used in tests.
|
||
return {
|
||
ok: this.ok,
|
||
lastModified: this.lastModified,
|
||
errors: this.errors,
|
||
created: this.created,
|
||
updated: this.updated,
|
||
deleted: this.deleted,
|
||
skipped: this.skipped,
|
||
published: this.published,
|
||
conflicts: this.conflicts,
|
||
resolved: this.resolved,
|
||
};
|
||
}
|
||
}
|
||
class ServerWasFlushedError extends Error {
|
||
constructor(clientTimestamp, serverTimestamp, message) {
|
||
super(message);
|
||
if (Error.captureStackTrace) {
|
||
Error.captureStackTrace(this, ServerWasFlushedError);
|
||
}
|
||
this.clientTimestamp = clientTimestamp;
|
||
this.serverTimestamp = serverTimestamp;
|
||
}
|
||
}
|
||
function createUUIDSchema() {
|
||
return {
|
||
generate() {
|
||
return uuid4();
|
||
},
|
||
validate(id) {
|
||
return typeof id == "string" && RE_RECORD_ID.test(id);
|
||
},
|
||
};
|
||
}
|
||
function markStatus(record, status) {
|
||
return Object.assign(Object.assign({}, record), { _status: status });
|
||
}
|
||
function markDeleted(record) {
|
||
return markStatus(record, "deleted");
|
||
}
|
||
function markSynced(record) {
|
||
return markStatus(record, "synced");
|
||
}
|
||
/**
|
||
* Import a remote change into the local database.
|
||
*
|
||
* @param {IDBTransactionProxy} transaction The transaction handler.
|
||
* @param {Object} remote The remote change object to import.
|
||
* @param {Array<String>} localFields The list of fields that remain local.
|
||
* @param {String} strategy The {@link Collection.strategy}.
|
||
* @return {Object}
|
||
*/
|
||
function importChange(transaction, remote, localFields, strategy) {
|
||
const local = transaction.get(remote.id);
|
||
if (!local) {
|
||
// Not found locally but remote change is marked as deleted; skip to
|
||
// avoid recreation.
|
||
if (remote.deleted) {
|
||
return { type: "skipped", data: remote };
|
||
}
|
||
const synced = markSynced(remote);
|
||
transaction.create(synced);
|
||
return { type: "created", data: synced };
|
||
}
|
||
// Apply remote changes on local record.
|
||
const synced = Object.assign(Object.assign({}, local), markSynced(remote));
|
||
// With pull only, we don't need to compare records since we override them.
|
||
if (strategy === Collection.strategy.PULL_ONLY) {
|
||
if (remote.deleted) {
|
||
transaction.delete(remote.id);
|
||
return { type: "deleted", data: local };
|
||
}
|
||
transaction.update(synced);
|
||
return { type: "updated", data: { old: local, new: synced } };
|
||
}
|
||
// With other sync strategies, we detect conflicts,
|
||
// by comparing local and remote, ignoring local fields.
|
||
const isIdentical = recordsEqual(local, remote, localFields);
|
||
// Detect or ignore conflicts if record has also been modified locally.
|
||
if (local._status !== "synced") {
|
||
// Locally deleted, unsynced: scheduled for remote deletion.
|
||
if (local._status === "deleted") {
|
||
return { type: "skipped", data: local };
|
||
}
|
||
if (isIdentical) {
|
||
// If records are identical, import anyway, so we bump the
|
||
// local last_modified value from the server and set record
|
||
// status to "synced".
|
||
transaction.update(synced);
|
||
return { type: "updated", data: { old: local, new: synced } };
|
||
}
|
||
if (local.last_modified !== undefined &&
|
||
local.last_modified === remote.last_modified) {
|
||
// If our local version has the same last_modified as the remote
|
||
// one, this represents an object that corresponds to a resolved
|
||
// conflict. Our local version represents the final output, so
|
||
// we keep that one. (No transaction operation to do.)
|
||
// But if our last_modified is undefined,
|
||
// that means we've created the same object locally as one on
|
||
// the server, which *must* be a conflict.
|
||
return { type: "void" };
|
||
}
|
||
return {
|
||
type: "conflicts",
|
||
data: { type: "incoming", local: local, remote: remote },
|
||
};
|
||
}
|
||
// Local record was synced.
|
||
if (remote.deleted) {
|
||
transaction.delete(remote.id);
|
||
return { type: "deleted", data: local };
|
||
}
|
||
// Import locally.
|
||
transaction.update(synced);
|
||
// if identical, simply exclude it from all SyncResultObject lists
|
||
const type = isIdentical ? "void" : "updated";
|
||
return { type, data: { old: local, new: synced } };
|
||
}
|
||
/**
|
||
* Abstracts a collection of records stored in the local database, providing
|
||
* CRUD operations and synchronization helpers.
|
||
*/
|
||
class Collection {
|
||
/**
|
||
* Constructor.
|
||
*
|
||
* Options:
|
||
* - `{BaseAdapter} adapter` The DB adapter (default: `IDB`)
|
||
*
|
||
* @param {String} bucket The bucket identifier.
|
||
* @param {String} name The collection name.
|
||
* @param {KintoBase} kinto The Kinto instance.
|
||
* @param {Object} options The options object.
|
||
*/
|
||
constructor(bucket, name, kinto, options = {}) {
|
||
this._bucket = bucket;
|
||
this._name = name;
|
||
this._lastModified = null;
|
||
const DBAdapter = options.adapter || IDB;
|
||
if (!DBAdapter) {
|
||
throw new Error("No adapter provided");
|
||
}
|
||
const db = new DBAdapter(`${bucket}/${name}`, options.adapterOptions);
|
||
if (!(db instanceof BaseAdapter)) {
|
||
throw new Error("Unsupported adapter.");
|
||
}
|
||
// public properties
|
||
/**
|
||
* The db adapter instance
|
||
* @type {BaseAdapter}
|
||
*/
|
||
this.db = db;
|
||
/**
|
||
* The KintoBase instance.
|
||
* @type {KintoBase}
|
||
*/
|
||
this.kinto = kinto;
|
||
/**
|
||
* The event emitter instance.
|
||
* @type {EventEmitter}
|
||
*/
|
||
this.events = options.events;
|
||
/**
|
||
* The IdSchema instance.
|
||
* @type {Object}
|
||
*/
|
||
this.idSchema = this._validateIdSchema(options.idSchema);
|
||
/**
|
||
* The list of remote transformers.
|
||
* @type {Array}
|
||
*/
|
||
this.remoteTransformers = this._validateRemoteTransformers(options.remoteTransformers);
|
||
/**
|
||
* The list of hooks.
|
||
* @type {Object}
|
||
*/
|
||
this.hooks = this._validateHooks(options.hooks);
|
||
/**
|
||
* The list of fields names that will remain local.
|
||
* @type {Array}
|
||
*/
|
||
this.localFields = options.localFields || [];
|
||
}
|
||
/**
|
||
* The HTTP client.
|
||
* @type {KintoClient}
|
||
*/
|
||
get api() {
|
||
return this.kinto.api;
|
||
}
|
||
/**
|
||
* The collection name.
|
||
* @type {String}
|
||
*/
|
||
get name() {
|
||
return this._name;
|
||
}
|
||
/**
|
||
* The bucket name.
|
||
* @type {String}
|
||
*/
|
||
get bucket() {
|
||
return this._bucket;
|
||
}
|
||
/**
|
||
* The last modified timestamp.
|
||
* @type {Number}
|
||
*/
|
||
get lastModified() {
|
||
return this._lastModified;
|
||
}
|
||
/**
|
||
* Synchronization strategies. Available strategies are:
|
||
*
|
||
* - `MANUAL`: Conflicts will be reported in a dedicated array.
|
||
* - `SERVER_WINS`: Conflicts are resolved using remote data.
|
||
* - `CLIENT_WINS`: Conflicts are resolved using local data.
|
||
*
|
||
* @type {Object}
|
||
*/
|
||
static get strategy() {
|
||
return {
|
||
CLIENT_WINS: "client_wins",
|
||
SERVER_WINS: "server_wins",
|
||
PULL_ONLY: "pull_only",
|
||
MANUAL: "manual",
|
||
};
|
||
}
|
||
/**
|
||
* Validates an idSchema.
|
||
*
|
||
* @param {Object|undefined} idSchema
|
||
* @return {Object}
|
||
*/
|
||
_validateIdSchema(idSchema) {
|
||
if (typeof idSchema === "undefined") {
|
||
return createUUIDSchema();
|
||
}
|
||
if (typeof idSchema !== "object") {
|
||
throw new Error("idSchema must be an object.");
|
||
}
|
||
else if (typeof idSchema.generate !== "function") {
|
||
throw new Error("idSchema must provide a generate function.");
|
||
}
|
||
else if (typeof idSchema.validate !== "function") {
|
||
throw new Error("idSchema must provide a validate function.");
|
||
}
|
||
return idSchema;
|
||
}
|
||
/**
|
||
* Validates a list of remote transformers.
|
||
*
|
||
* @param {Array|undefined} remoteTransformers
|
||
* @return {Array}
|
||
*/
|
||
_validateRemoteTransformers(remoteTransformers) {
|
||
if (typeof remoteTransformers === "undefined") {
|
||
return [];
|
||
}
|
||
if (!Array.isArray(remoteTransformers)) {
|
||
throw new Error("remoteTransformers should be an array.");
|
||
}
|
||
return remoteTransformers.map(transformer => {
|
||
if (typeof transformer !== "object") {
|
||
throw new Error("A transformer must be an object.");
|
||
}
|
||
else if (typeof transformer.encode !== "function") {
|
||
throw new Error("A transformer must provide an encode function.");
|
||
}
|
||
else if (typeof transformer.decode !== "function") {
|
||
throw new Error("A transformer must provide a decode function.");
|
||
}
|
||
return transformer;
|
||
});
|
||
}
|
||
/**
|
||
* Validate the passed hook is correct.
|
||
*
|
||
* @param {Array|undefined} hook.
|
||
* @return {Array}
|
||
**/
|
||
_validateHook(hook) {
|
||
if (!Array.isArray(hook)) {
|
||
throw new Error("A hook definition should be an array of functions.");
|
||
}
|
||
return hook.map(fn => {
|
||
if (typeof fn !== "function") {
|
||
throw new Error("A hook definition should be an array of functions.");
|
||
}
|
||
return fn;
|
||
});
|
||
}
|
||
/**
|
||
* Validates a list of hooks.
|
||
*
|
||
* @param {Object|undefined} hooks
|
||
* @return {Object}
|
||
*/
|
||
_validateHooks(hooks) {
|
||
if (typeof hooks === "undefined") {
|
||
return {};
|
||
}
|
||
if (Array.isArray(hooks)) {
|
||
throw new Error("hooks should be an object, not an array.");
|
||
}
|
||
if (typeof hooks !== "object") {
|
||
throw new Error("hooks should be an object.");
|
||
}
|
||
const validatedHooks = {};
|
||
for (const hook in hooks) {
|
||
if (!AVAILABLE_HOOKS.includes(hook)) {
|
||
throw new Error("The hook should be one of " + AVAILABLE_HOOKS.join(", "));
|
||
}
|
||
validatedHooks[hook] = this._validateHook(hooks[hook]);
|
||
}
|
||
return validatedHooks;
|
||
}
|
||
/**
|
||
* Deletes every records in the current collection and marks the collection as
|
||
* never synced.
|
||
*
|
||
* @return {Promise}
|
||
*/
|
||
async clear() {
|
||
await this.db.clear();
|
||
await this.db.saveMetadata(null);
|
||
await this.db.saveLastModified(null);
|
||
return { data: [], permissions: {} };
|
||
}
|
||
/**
|
||
* Encodes a record.
|
||
*
|
||
* @param {String} type Either "remote" or "local".
|
||
* @param {Object} record The record object to encode.
|
||
* @return {Promise}
|
||
*/
|
||
_encodeRecord(type, record) {
|
||
if (!this[`${type}Transformers`].length) {
|
||
return Promise.resolve(record);
|
||
}
|
||
return waterfall(this[`${type}Transformers`].map(transformer => {
|
||
return record => transformer.encode(record);
|
||
}), record);
|
||
}
|
||
/**
|
||
* Decodes a record.
|
||
*
|
||
* @param {String} type Either "remote" or "local".
|
||
* @param {Object} record The record object to decode.
|
||
* @return {Promise}
|
||
*/
|
||
_decodeRecord(type, record) {
|
||
if (!this[`${type}Transformers`].length) {
|
||
return Promise.resolve(record);
|
||
}
|
||
return waterfall(this[`${type}Transformers`].reverse().map(transformer => {
|
||
return record => transformer.decode(record);
|
||
}), record);
|
||
}
|
||
/**
|
||
* Adds a record to the local database, asserting that none
|
||
* already exist with this ID.
|
||
*
|
||
* Note: If either the `useRecordId` or `synced` options are true, then the
|
||
* record object must contain the id field to be validated. If none of these
|
||
* options are true, an id is generated using the current IdSchema; in this
|
||
* case, the record passed must not have an id.
|
||
*
|
||
* Options:
|
||
* - {Boolean} synced Sets record status to "synced" (default: `false`).
|
||
* - {Boolean} useRecordId Forces the `id` field from the record to be used,
|
||
* instead of one that is generated automatically
|
||
* (default: `false`).
|
||
*
|
||
* @param {Object} record
|
||
* @param {Object} options
|
||
* @return {Promise}
|
||
*/
|
||
create(record, options = { useRecordId: false, synced: false }) {
|
||
// Validate the record and its ID (if any), even though this
|
||
// validation is also done in the CollectionTransaction method,
|
||
// because we need to pass the ID to preloadIds.
|
||
const reject = msg => Promise.reject(new Error(msg));
|
||
if (typeof record !== "object") {
|
||
return reject("Record is not an object.");
|
||
}
|
||
if ((options.synced || options.useRecordId) &&
|
||
!Object.prototype.hasOwnProperty.call(record, "id")) {
|
||
return reject("Missing required Id; synced and useRecordId options require one");
|
||
}
|
||
if (!options.synced &&
|
||
!options.useRecordId &&
|
||
Object.prototype.hasOwnProperty.call(record, "id")) {
|
||
return reject("Extraneous Id; can't create a record having one set.");
|
||
}
|
||
const newRecord = Object.assign(Object.assign({}, record), { id: options.synced || options.useRecordId
|
||
? record.id
|
||
: this.idSchema.generate(record), _status: options.synced ? "synced" : "created" });
|
||
if (!this.idSchema.validate(newRecord.id)) {
|
||
return reject(`Invalid Id: ${newRecord.id}`);
|
||
}
|
||
return this.execute(txn => txn.create(newRecord), {
|
||
preloadIds: [newRecord.id],
|
||
}).catch(err => {
|
||
if (options.useRecordId) {
|
||
throw new Error("Couldn't create record. It may have been virtually deleted.");
|
||
}
|
||
throw err;
|
||
});
|
||
}
|
||
/**
|
||
* Like {@link CollectionTransaction#update}, but wrapped in its own transaction.
|
||
*
|
||
* Options:
|
||
* - {Boolean} synced: Sets record status to "synced" (default: false)
|
||
* - {Boolean} patch: Extends the existing record instead of overwriting it
|
||
* (default: false)
|
||
*
|
||
* @param {Object} record
|
||
* @param {Object} options
|
||
* @return {Promise}
|
||
*/
|
||
update(record, options = { synced: false, patch: false }) {
|
||
// Validate the record and its ID, even though this validation is
|
||
// also done in the CollectionTransaction method, because we need
|
||
// to pass the ID to preloadIds.
|
||
if (typeof record !== "object") {
|
||
return Promise.reject(new Error("Record is not an object."));
|
||
}
|
||
if (!Object.prototype.hasOwnProperty.call(record, "id")) {
|
||
return Promise.reject(new Error("Cannot update a record missing id."));
|
||
}
|
||
if (!this.idSchema.validate(record.id)) {
|
||
return Promise.reject(new Error(`Invalid Id: ${record.id}`));
|
||
}
|
||
return this.execute(txn => txn.update(record, options), {
|
||
preloadIds: [record.id],
|
||
});
|
||
}
|
||
/**
|
||
* Like {@link CollectionTransaction#upsert}, but wrapped in its own transaction.
|
||
*
|
||
* @param {Object} record
|
||
* @return {Promise}
|
||
*/
|
||
upsert(record) {
|
||
// Validate the record and its ID, even though this validation is
|
||
// also done in the CollectionTransaction method, because we need
|
||
// to pass the ID to preloadIds.
|
||
if (typeof record !== "object") {
|
||
return Promise.reject(new Error("Record is not an object."));
|
||
}
|
||
if (!Object.prototype.hasOwnProperty.call(record, "id")) {
|
||
return Promise.reject(new Error("Cannot update a record missing id."));
|
||
}
|
||
if (!this.idSchema.validate(record.id)) {
|
||
return Promise.reject(new Error(`Invalid Id: ${record.id}`));
|
||
}
|
||
return this.execute(txn => txn.upsert(record), { preloadIds: [record.id] });
|
||
}
|
||
/**
|
||
* Like {@link CollectionTransaction#get}, but wrapped in its own transaction.
|
||
*
|
||
* Options:
|
||
* - {Boolean} includeDeleted: Include virtually deleted records.
|
||
*
|
||
* @param {String} id
|
||
* @param {Object} options
|
||
* @return {Promise}
|
||
*/
|
||
get(id, options = { includeDeleted: false }) {
|
||
return this.execute(txn => txn.get(id, options), { preloadIds: [id] });
|
||
}
|
||
/**
|
||
* Like {@link CollectionTransaction#getAny}, but wrapped in its own transaction.
|
||
*
|
||
* @param {String} id
|
||
* @return {Promise}
|
||
*/
|
||
getAny(id) {
|
||
return this.execute(txn => txn.getAny(id), { preloadIds: [id] });
|
||
}
|
||
/**
|
||
* Same as {@link Collection#delete}, but wrapped in its own transaction.
|
||
*
|
||
* Options:
|
||
* - {Boolean} virtual: When set to `true`, doesn't actually delete the record,
|
||
* update its `_status` attribute to `deleted` instead (default: true)
|
||
*
|
||
* @param {String} id The record's Id.
|
||
* @param {Object} options The options object.
|
||
* @return {Promise}
|
||
*/
|
||
delete(id, options = { virtual: true }) {
|
||
return this.execute(transaction => {
|
||
return transaction.delete(id, options);
|
||
}, { preloadIds: [id] });
|
||
}
|
||
/**
|
||
* Same as {@link Collection#deleteAll}, but wrapped in its own transaction, execulding the parameter.
|
||
*
|
||
* @return {Promise}
|
||
*/
|
||
async deleteAll() {
|
||
const { data } = await this.list({}, { includeDeleted: false });
|
||
const recordIds = data.map(record => record.id);
|
||
return this.execute(transaction => {
|
||
return transaction.deleteAll(recordIds);
|
||
}, { preloadIds: recordIds });
|
||
}
|
||
/**
|
||
* The same as {@link CollectionTransaction#deleteAny}, but wrapped
|
||
* in its own transaction.
|
||
*
|
||
* @param {String} id The record's Id.
|
||
* @return {Promise}
|
||
*/
|
||
deleteAny(id) {
|
||
return this.execute(txn => txn.deleteAny(id), { preloadIds: [id] });
|
||
}
|
||
/**
|
||
* Lists records from the local database.
|
||
*
|
||
* Params:
|
||
* - {Object} filters Filter the results (default: `{}`).
|
||
* - {String} order The order to apply (default: `-last_modified`).
|
||
*
|
||
* Options:
|
||
* - {Boolean} includeDeleted: Include virtually deleted records.
|
||
*
|
||
* @param {Object} params The filters and order to apply to the results.
|
||
* @param {Object} options The options object.
|
||
* @return {Promise}
|
||
*/
|
||
async list(params = {}, options = { includeDeleted: false }) {
|
||
params = Object.assign({ order: "-last_modified", filters: {} }, params);
|
||
const results = await this.db.list(params);
|
||
let data = results;
|
||
if (!options.includeDeleted) {
|
||
data = results.filter(record => record._status !== "deleted");
|
||
}
|
||
return { data, permissions: {} };
|
||
}
|
||
/**
|
||
* Imports remote changes into the local database.
|
||
* This method is in charge of detecting the conflicts, and resolve them
|
||
* according to the specified strategy.
|
||
* @param {SyncResultObject} syncResultObject The sync result object.
|
||
* @param {Array} decodedChanges The list of changes to import in the local database.
|
||
* @param {String} strategy The {@link Collection.strategy} (default: MANUAL)
|
||
* @return {Promise}
|
||
*/
|
||
async importChanges(syncResultObject, decodedChanges, strategy = Collection.strategy.MANUAL) {
|
||
// Retrieve records matching change ids.
|
||
try {
|
||
for (let i = 0; i < decodedChanges.length; i += IMPORT_CHUNK_SIZE) {
|
||
const slice = decodedChanges.slice(i, i + IMPORT_CHUNK_SIZE);
|
||
const { imports, resolved } = await this.db.execute(transaction => {
|
||
const imports = slice.map(remote => {
|
||
// Store remote change into local database.
|
||
return importChange(transaction, remote, this.localFields, strategy);
|
||
});
|
||
const conflicts = imports
|
||
.filter(i => i.type === "conflicts")
|
||
.map(i => i.data);
|
||
const resolved = this._handleConflicts(transaction, conflicts, strategy);
|
||
return { imports, resolved };
|
||
}, { preload: slice.map(record => record.id) });
|
||
// Lists of created/updated/deleted records
|
||
imports.forEach(({ type, data }) => syncResultObject.add(type, data));
|
||
// Automatically resolved conflicts (if not manual)
|
||
if (resolved.length > 0) {
|
||
syncResultObject.reset("conflicts").add("resolved", resolved);
|
||
}
|
||
}
|
||
}
|
||
catch (err) {
|
||
const data = {
|
||
type: "incoming",
|
||
message: err.message,
|
||
stack: err.stack,
|
||
};
|
||
// XXX one error of the whole transaction instead of per atomic op
|
||
syncResultObject.add("errors", data);
|
||
}
|
||
return syncResultObject;
|
||
}
|
||
/**
|
||
* Imports the responses of pushed changes into the local database.
|
||
* Basically it stores the timestamp assigned by the server into the local
|
||
* database.
|
||
* @param {SyncResultObject} syncResultObject The sync result object.
|
||
* @param {Array} toApplyLocally The list of changes to import in the local database.
|
||
* @param {Array} conflicts The list of conflicts that have to be resolved.
|
||
* @param {String} strategy The {@link Collection.strategy}.
|
||
* @return {Promise}
|
||
*/
|
||
async _applyPushedResults(syncResultObject, toApplyLocally, conflicts, strategy = Collection.strategy.MANUAL) {
|
||
const toDeleteLocally = toApplyLocally.filter(r => r.deleted);
|
||
const toUpdateLocally = toApplyLocally.filter(r => !r.deleted);
|
||
const { published, resolved } = await this.db.execute(transaction => {
|
||
const updated = toUpdateLocally.map(record => {
|
||
const synced = markSynced(record);
|
||
transaction.update(synced);
|
||
return synced;
|
||
});
|
||
const deleted = toDeleteLocally.map(record => {
|
||
transaction.delete(record.id);
|
||
// Amend result data with the deleted attribute set
|
||
return { id: record.id, deleted: true };
|
||
});
|
||
const published = updated.concat(deleted);
|
||
// Handle conflicts, if any
|
||
const resolved = this._handleConflicts(transaction, conflicts, strategy);
|
||
return { published, resolved };
|
||
});
|
||
syncResultObject.add("published", published);
|
||
if (resolved.length > 0) {
|
||
syncResultObject
|
||
.reset("conflicts")
|
||
.reset("resolved")
|
||
.add("resolved", resolved);
|
||
}
|
||
return syncResultObject;
|
||
}
|
||
/**
|
||
* Handles synchronization conflicts according to specified strategy.
|
||
*
|
||
* @param {SyncResultObject} result The sync result object.
|
||
* @param {String} strategy The {@link Collection.strategy}.
|
||
* @return {Promise<Array<Object>>} The resolved conflicts, as an
|
||
* array of {accepted, rejected} objects
|
||
*/
|
||
_handleConflicts(transaction, conflicts, strategy) {
|
||
if (strategy === Collection.strategy.MANUAL) {
|
||
return [];
|
||
}
|
||
return conflicts.map(conflict => {
|
||
const resolution = strategy === Collection.strategy.CLIENT_WINS
|
||
? conflict.local
|
||
: conflict.remote;
|
||
const rejected = strategy === Collection.strategy.CLIENT_WINS
|
||
? conflict.remote
|
||
: conflict.local;
|
||
let accepted, status, id;
|
||
if (resolution === null) {
|
||
// We "resolved" with the server-side deletion. Delete locally.
|
||
// This only happens during SERVER_WINS because the local
|
||
// version of a record can never be null.
|
||
// We can get "null" from the remote side if we got a conflict
|
||
// and there is no remote version available; see kinto-http.js
|
||
// batch.js:aggregate.
|
||
transaction.delete(conflict.local.id);
|
||
accepted = null;
|
||
// The record was deleted, but that status is "synced" with
|
||
// the server, so we don't need to push the change.
|
||
status = "synced";
|
||
id = conflict.local.id;
|
||
}
|
||
else {
|
||
const updated = this._resolveRaw(conflict, resolution);
|
||
transaction.update(updated);
|
||
accepted = updated;
|
||
status = updated._status;
|
||
id = updated.id;
|
||
}
|
||
return { rejected, accepted, id, _status: status };
|
||
});
|
||
}
|
||
/**
|
||
* Execute a bunch of operations in a transaction.
|
||
*
|
||
* This transaction should be atomic -- either all of its operations
|
||
* will succeed, or none will.
|
||
*
|
||
* The argument to this function is itself a function which will be
|
||
* called with a {@link CollectionTransaction}. Collection methods
|
||
* are available on this transaction, but instead of returning
|
||
* promises, they are synchronous. execute() returns a Promise whose
|
||
* value will be the return value of the provided function.
|
||
*
|
||
* Most operations will require access to the record itself, which
|
||
* must be preloaded by passing its ID in the preloadIds option.
|
||
*
|
||
* Options:
|
||
* - {Array} preloadIds: list of IDs to fetch at the beginning of
|
||
* the transaction
|
||
*
|
||
* @return {Promise} Resolves with the result of the given function
|
||
* when the transaction commits.
|
||
*/
|
||
execute(doOperations, { preloadIds = [] } = {}) {
|
||
for (const id of preloadIds) {
|
||
if (!this.idSchema.validate(id)) {
|
||
return Promise.reject(Error(`Invalid Id: ${id}`));
|
||
}
|
||
}
|
||
return this.db.execute(transaction => {
|
||
const txn = new CollectionTransaction(this, transaction);
|
||
const result = doOperations(txn);
|
||
txn.emitEvents();
|
||
return result;
|
||
}, { preload: preloadIds });
|
||
}
|
||
/**
|
||
* Resets the local records as if they were never synced; existing records are
|
||
* marked as newly created, deleted records are dropped.
|
||
*
|
||
* A next call to {@link Collection.sync} will thus republish the whole
|
||
* content of the local collection to the server.
|
||
*
|
||
* @return {Promise} Resolves with the number of processed records.
|
||
*/
|
||
async resetSyncStatus() {
|
||
const unsynced = await this.list({ filters: { _status: ["deleted", "synced"] }, order: "" }, { includeDeleted: true });
|
||
await this.db.execute(transaction => {
|
||
unsynced.data.forEach(record => {
|
||
if (record._status === "deleted") {
|
||
// Garbage collect deleted records.
|
||
transaction.delete(record.id);
|
||
}
|
||
else {
|
||
// Records that were synced become «created».
|
||
transaction.update(Object.assign(Object.assign({}, record), { last_modified: undefined, _status: "created" }));
|
||
}
|
||
});
|
||
});
|
||
this._lastModified = null;
|
||
await this.db.saveLastModified(null);
|
||
return unsynced.data.length;
|
||
}
|
||
/**
|
||
* Returns an object containing two lists:
|
||
*
|
||
* - `toDelete`: unsynced deleted records we can safely delete;
|
||
* - `toSync`: local updates to send to the server.
|
||
*
|
||
* @return {Promise}
|
||
*/
|
||
async gatherLocalChanges() {
|
||
const unsynced = await this.list({
|
||
filters: { _status: ["created", "updated"] },
|
||
order: "",
|
||
});
|
||
const deleted = await this.list({ filters: { _status: "deleted" }, order: "" }, { includeDeleted: true });
|
||
return await Promise.all(unsynced.data
|
||
.concat(deleted.data)
|
||
.map(this._encodeRecord.bind(this, "remote")));
|
||
}
|
||
/**
|
||
* Fetch remote changes, import them to the local database, and handle
|
||
* conflicts according to `options.strategy`. Then, updates the passed
|
||
* {@link SyncResultObject} with import results.
|
||
*
|
||
* Options:
|
||
* - {String} strategy: The selected sync strategy.
|
||
* - {String} expectedTimestamp: A timestamp to use as a "cache busting" query parameter.
|
||
* - {Array<String>} exclude: A list of record ids to exclude from pull.
|
||
* - {Object} headers: The HTTP headers to use in the request.
|
||
* - {int} retry: The number of retries to do if the HTTP request fails.
|
||
* - {int} lastModified: The timestamp to use in `?_since` query.
|
||
*
|
||
* @param {KintoClient.Collection} client Kinto client Collection instance.
|
||
* @param {SyncResultObject} syncResultObject The sync result object.
|
||
* @param {Object} options The options object.
|
||
* @return {Promise}
|
||
*/
|
||
async pullChanges(client, syncResultObject, options = {}) {
|
||
if (!syncResultObject.ok) {
|
||
return syncResultObject;
|
||
}
|
||
const since = this.lastModified
|
||
? this.lastModified
|
||
: await this.db.getLastModified();
|
||
options = Object.assign({ strategy: Collection.strategy.MANUAL, lastModified: since, headers: {} }, options);
|
||
// Optionally ignore some records when pulling for changes.
|
||
// (avoid redownloading our own changes on last step of #sync())
|
||
let filters;
|
||
if (options.exclude) {
|
||
// Limit the list of excluded records to the first 50 records in order
|
||
// to remain under de-facto URL size limit (~2000 chars).
|
||
// http://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers/417184#417184
|
||
const exclude_id = options.exclude
|
||
.slice(0, 50)
|
||
.map(r => r.id)
|
||
.join(",");
|
||
filters = { exclude_id };
|
||
}
|
||
if (options.expectedTimestamp) {
|
||
filters = Object.assign(Object.assign({}, filters), { _expected: options.expectedTimestamp });
|
||
}
|
||
// First fetch remote changes from the server
|
||
const { data, last_modified } = await client.listRecords({
|
||
// Since should be ETag (see https://github.com/Kinto/kinto.js/issues/356)
|
||
since: options.lastModified ? `${options.lastModified}` : undefined,
|
||
headers: options.headers,
|
||
retry: options.retry,
|
||
// Fetch every page by default (FIXME: option to limit pages, see #277)
|
||
pages: Infinity,
|
||
filters,
|
||
});
|
||
// last_modified is the ETag header value (string).
|
||
// For retro-compatibility with first kinto.js versions
|
||
// parse it to integer.
|
||
const unquoted = last_modified ? parseInt(last_modified, 10) : undefined;
|
||
// Check if server was flushed.
|
||
// This is relevant for the Kinto demo server
|
||
// (and thus for many new comers).
|
||
const localSynced = options.lastModified;
|
||
const serverChanged = unquoted > options.lastModified;
|
||
const emptyCollection = data.length === 0;
|
||
if (!options.exclude && localSynced && serverChanged && emptyCollection) {
|
||
const e = new ServerWasFlushedError(localSynced, unquoted, "Server has been flushed. Client Side Timestamp: " +
|
||
localSynced +
|
||
" Server Side Timestamp: " +
|
||
unquoted);
|
||
throw e;
|
||
}
|
||
// Atomic updates are not sensible here because unquoted is not
|
||
// computed as a function of syncResultObject.lastModified.
|
||
// eslint-disable-next-line require-atomic-updates
|
||
syncResultObject.lastModified = unquoted;
|
||
// Decode incoming changes.
|
||
const decodedChanges = await Promise.all(data.map(change => {
|
||
return this._decodeRecord("remote", change);
|
||
}));
|
||
// Hook receives decoded records.
|
||
const payload = { lastModified: unquoted, changes: decodedChanges };
|
||
const afterHooks = await this.applyHook("incoming-changes", payload);
|
||
// No change, nothing to import.
|
||
if (afterHooks.changes.length > 0) {
|
||
// Reflect these changes locally
|
||
await this.importChanges(syncResultObject, afterHooks.changes, options.strategy);
|
||
}
|
||
return syncResultObject;
|
||
}
|
||
applyHook(hookName, payload) {
|
||
if (typeof this.hooks[hookName] == "undefined") {
|
||
return Promise.resolve(payload);
|
||
}
|
||
return waterfall(this.hooks[hookName].map(hook => {
|
||
return record => {
|
||
const result = hook(payload, this);
|
||
const resultThenable = result && typeof result.then === "function";
|
||
const resultChanges = result && Object.prototype.hasOwnProperty.call(result, "changes");
|
||
if (!(resultThenable || resultChanges)) {
|
||
throw new Error(`Invalid return value for hook: ${JSON.stringify(result)} has no 'then()' or 'changes' properties`);
|
||
}
|
||
return result;
|
||
};
|
||
}), payload);
|
||
}
|
||
/**
|
||
* Publish local changes to the remote server and updates the passed
|
||
* {@link SyncResultObject} with publication results.
|
||
*
|
||
* Options:
|
||
* - {String} strategy: The selected sync strategy.
|
||
* - {Object} headers: The HTTP headers to use in the request.
|
||
* - {int} retry: The number of retries to do if the HTTP request fails.
|
||
*
|
||
* @param {KintoClient.Collection} client Kinto client Collection instance.
|
||
* @param {SyncResultObject} syncResultObject The sync result object.
|
||
* @param {Object} changes The change object.
|
||
* @param {Array} changes.toDelete The list of records to delete.
|
||
* @param {Array} changes.toSync The list of records to create/update.
|
||
* @param {Object} options The options object.
|
||
* @return {Promise}
|
||
*/
|
||
async pushChanges(client, changes, syncResultObject, options = {}) {
|
||
if (!syncResultObject.ok) {
|
||
return syncResultObject;
|
||
}
|
||
const safe = !options.strategy || options.strategy !== Collection.CLIENT_WINS;
|
||
const toDelete = changes.filter(r => r._status == "deleted");
|
||
const toSync = changes.filter(r => r._status != "deleted");
|
||
// Perform a batch request with every changes.
|
||
const synced = await client.batch(batch => {
|
||
toDelete.forEach(r => {
|
||
// never published locally deleted records should not be pusblished
|
||
if (r.last_modified) {
|
||
batch.deleteRecord(r);
|
||
}
|
||
});
|
||
toSync.forEach(r => {
|
||
// Clean local fields (like _status) before sending to server.
|
||
const published = this.cleanLocalFields(r);
|
||
if (r._status === "created") {
|
||
batch.createRecord(published);
|
||
}
|
||
else {
|
||
batch.updateRecord(published);
|
||
}
|
||
});
|
||
}, {
|
||
headers: options.headers,
|
||
retry: options.retry,
|
||
safe,
|
||
aggregate: true,
|
||
});
|
||
// Store outgoing errors into sync result object
|
||
syncResultObject.add("errors", synced.errors.map(e => (Object.assign(Object.assign({}, e), { type: "outgoing" }))));
|
||
// Store outgoing conflicts into sync result object
|
||
const conflicts = [];
|
||
for (const { type, local, remote } of synced.conflicts) {
|
||
// Note: we ensure that local data are actually available, as they may
|
||
// be missing in the case of a published deletion.
|
||
const safeLocal = (local && local.data) || { id: remote.id };
|
||
const realLocal = await this._decodeRecord("remote", safeLocal);
|
||
// We can get "null" from the remote side if we got a conflict
|
||
// and there is no remote version available; see kinto-http.js
|
||
// batch.js:aggregate.
|
||
const realRemote = remote && (await this._decodeRecord("remote", remote));
|
||
const conflict = { type, local: realLocal, remote: realRemote };
|
||
conflicts.push(conflict);
|
||
}
|
||
syncResultObject.add("conflicts", conflicts);
|
||
// Records that must be deleted are either deletions that were pushed
|
||
// to server (published) or deleted records that were never pushed (skipped).
|
||
const missingRemotely = synced.skipped.map(r => (Object.assign(Object.assign({}, r), { deleted: true })));
|
||
// For created and updated records, the last_modified coming from server
|
||
// will be stored locally.
|
||
// Reflect publication results locally using the response from
|
||
// the batch request.
|
||
const published = synced.published.map(c => c.data);
|
||
const toApplyLocally = published.concat(missingRemotely);
|
||
// Apply the decode transformers, if any
|
||
const decoded = await Promise.all(toApplyLocally.map(record => {
|
||
return this._decodeRecord("remote", record);
|
||
}));
|
||
// We have to update the local records with the responses of the server
|
||
// (eg. last_modified values etc.).
|
||
if (decoded.length > 0 || conflicts.length > 0) {
|
||
await this._applyPushedResults(syncResultObject, decoded, conflicts, options.strategy);
|
||
}
|
||
return syncResultObject;
|
||
}
|
||
/**
|
||
* Return a copy of the specified record without the local fields.
|
||
*
|
||
* @param {Object} record A record with potential local fields.
|
||
* @return {Object}
|
||
*/
|
||
cleanLocalFields(record) {
|
||
const localKeys = RECORD_FIELDS_TO_CLEAN.concat(this.localFields);
|
||
return omitKeys(record, localKeys);
|
||
}
|
||
/**
|
||
* Resolves a conflict, updating local record according to proposed
|
||
* resolution — keeping remote record `last_modified` value as a reference for
|
||
* further batch sending.
|
||
*
|
||
* @param {Object} conflict The conflict object.
|
||
* @param {Object} resolution The proposed record.
|
||
* @return {Promise}
|
||
*/
|
||
resolve(conflict, resolution) {
|
||
return this.db.execute(transaction => {
|
||
const updated = this._resolveRaw(conflict, resolution);
|
||
transaction.update(updated);
|
||
return { data: updated, permissions: {} };
|
||
});
|
||
}
|
||
/**
|
||
* @private
|
||
*/
|
||
_resolveRaw(conflict, resolution) {
|
||
const resolved = Object.assign(Object.assign({}, resolution), {
|
||
// Ensure local record has the latest authoritative timestamp
|
||
last_modified: conflict.remote && conflict.remote.last_modified });
|
||
// If the resolution object is strictly equal to the
|
||
// remote record, then we can mark it as synced locally.
|
||
// Otherwise, mark it as updated (so that the resolution is pushed).
|
||
const synced = deepEqual(resolved, conflict.remote);
|
||
return markStatus(resolved, synced ? "synced" : "updated");
|
||
}
|
||
/**
|
||
* Synchronize remote and local data. The promise will resolve with a
|
||
* {@link SyncResultObject}, though will reject:
|
||
*
|
||
* - if the server is currently backed off;
|
||
* - if the server has been detected flushed.
|
||
*
|
||
* Options:
|
||
* - {Object} headers: HTTP headers to attach to outgoing requests.
|
||
* - {String} expectedTimestamp: A timestamp to use as a "cache busting" query parameter.
|
||
* - {Number} retry: Number of retries when server fails to process the request (default: 1).
|
||
* - {Collection.strategy} strategy: See {@link Collection.strategy}.
|
||
* - {Boolean} ignoreBackoff: Force synchronization even if server is currently
|
||
* backed off.
|
||
* - {String} bucket: The remove bucket id to use (default: null)
|
||
* - {String} collection: The remove collection id to use (default: null)
|
||
* - {String} remote The remote Kinto server endpoint to use (default: null).
|
||
*
|
||
* @param {Object} options Options.
|
||
* @return {Promise}
|
||
* @throws {Error} If an invalid remote option is passed.
|
||
*/
|
||
async sync(options = {
|
||
strategy: Collection.strategy.MANUAL,
|
||
headers: {},
|
||
retry: 1,
|
||
ignoreBackoff: false,
|
||
bucket: null,
|
||
collection: null,
|
||
remote: null,
|
||
expectedTimestamp: null,
|
||
}) {
|
||
options = Object.assign(Object.assign({}, options), { bucket: options.bucket || this.bucket, collection: options.collection || this.name });
|
||
const previousRemote = this.api.remote;
|
||
if (options.remote) {
|
||
// Note: setting the remote ensures it's valid, throws when invalid.
|
||
this.api.remote = options.remote;
|
||
}
|
||
if (!options.ignoreBackoff && this.api.backoff > 0) {
|
||
const seconds = Math.ceil(this.api.backoff / 1000);
|
||
return Promise.reject(new Error(`Server is asking clients to back off; retry in ${seconds}s or use the ignoreBackoff option.`));
|
||
}
|
||
const client = this.api
|
||
.bucket(options.bucket)
|
||
.collection(options.collection);
|
||
const result = new SyncResultObject();
|
||
try {
|
||
// Fetch collection metadata.
|
||
await this.pullMetadata(client, options);
|
||
// Fetch last changes from the server.
|
||
await this.pullChanges(client, result, options);
|
||
const { lastModified } = result;
|
||
if (options.strategy != Collection.strategy.PULL_ONLY) {
|
||
// Fetch local changes
|
||
const toSync = await this.gatherLocalChanges();
|
||
// Publish local changes and pull local resolutions
|
||
await this.pushChanges(client, toSync, result, options);
|
||
// Publish local resolution of push conflicts to server (on CLIENT_WINS)
|
||
const resolvedUnsynced = result.resolved.filter(r => r._status !== "synced");
|
||
if (resolvedUnsynced.length > 0) {
|
||
const resolvedEncoded = await Promise.all(resolvedUnsynced.map(resolution => {
|
||
let record = resolution.accepted;
|
||
if (record === null) {
|
||
record = { id: resolution.id, _status: resolution._status };
|
||
}
|
||
return this._encodeRecord("remote", record);
|
||
}));
|
||
await this.pushChanges(client, resolvedEncoded, result, options);
|
||
}
|
||
// Perform a last pull to catch changes that occured after the last pull,
|
||
// while local changes were pushed. Do not do it nothing was pushed.
|
||
if (result.published.length > 0) {
|
||
// Avoid redownloading our own changes during the last pull.
|
||
const pullOpts = Object.assign(Object.assign({}, options), { lastModified, exclude: result.published });
|
||
await this.pullChanges(client, result, pullOpts);
|
||
}
|
||
}
|
||
// Don't persist lastModified value if any conflict or error occured
|
||
if (result.ok) {
|
||
// No conflict occured, persist collection's lastModified value
|
||
this._lastModified = await this.db.saveLastModified(result.lastModified);
|
||
}
|
||
}
|
||
catch (e) {
|
||
this.events.emit("sync:error", Object.assign(Object.assign({}, options), { error: e }));
|
||
throw e;
|
||
}
|
||
finally {
|
||
// Ensure API default remote is reverted if a custom one's been used
|
||
this.api.remote = previousRemote;
|
||
}
|
||
this.events.emit("sync:success", Object.assign(Object.assign({}, options), { result }));
|
||
return result;
|
||
}
|
||
/**
|
||
* Load a list of records already synced with the remote server.
|
||
*
|
||
* The local records which are unsynced or whose timestamp is either missing
|
||
* or superior to those being loaded will be ignored.
|
||
*
|
||
* @deprecated Use {@link importBulk} instead.
|
||
* @param {Array} records The previously exported list of records to load.
|
||
* @return {Promise} with the effectively imported records.
|
||
*/
|
||
async loadDump(records) {
|
||
return this.importBulk(records);
|
||
}
|
||
/**
|
||
* Load a list of records already synced with the remote server.
|
||
*
|
||
* The local records which are unsynced or whose timestamp is either missing
|
||
* or superior to those being loaded will be ignored.
|
||
*
|
||
* @param {Array} records The previously exported list of records to load.
|
||
* @return {Promise} with the effectively imported records.
|
||
*/
|
||
async importBulk(records) {
|
||
if (!Array.isArray(records)) {
|
||
throw new Error("Records is not an array.");
|
||
}
|
||
for (const record of records) {
|
||
if (!Object.prototype.hasOwnProperty.call(record, "id") ||
|
||
!this.idSchema.validate(record.id)) {
|
||
throw new Error("Record has invalid ID: " + JSON.stringify(record));
|
||
}
|
||
if (!record.last_modified) {
|
||
throw new Error("Record has no last_modified value: " + JSON.stringify(record));
|
||
}
|
||
}
|
||
// Fetch all existing records from local database,
|
||
// and skip those who are newer or not marked as synced.
|
||
// XXX filter by status / ids in records
|
||
const { data } = await this.list({}, { includeDeleted: true });
|
||
const existingById = data.reduce((acc, record) => {
|
||
acc[record.id] = record;
|
||
return acc;
|
||
}, {});
|
||
const newRecords = records.filter(record => {
|
||
const localRecord = existingById[record.id];
|
||
const shouldKeep =
|
||
// No local record with this id.
|
||
localRecord === undefined ||
|
||
// Or local record is synced
|
||
(localRecord._status === "synced" &&
|
||
// And was synced from server
|
||
localRecord.last_modified !== undefined &&
|
||
// And is older than imported one.
|
||
record.last_modified > localRecord.last_modified);
|
||
return shouldKeep;
|
||
});
|
||
return await this.db.importBulk(newRecords.map(markSynced));
|
||
}
|
||
async pullMetadata(client, options = {}) {
|
||
const { expectedTimestamp, headers } = options;
|
||
const query = expectedTimestamp
|
||
? { query: { _expected: expectedTimestamp } }
|
||
: undefined;
|
||
const metadata = await client.getData(Object.assign(Object.assign({}, query), { headers }));
|
||
return this.db.saveMetadata(metadata);
|
||
}
|
||
async metadata() {
|
||
return this.db.getMetadata();
|
||
}
|
||
}
|
||
/**
|
||
* A Collection-oriented wrapper for an adapter's transaction.
|
||
*
|
||
* This defines the high-level functions available on a collection.
|
||
* The collection itself offers functions of the same name. These will
|
||
* perform just one operation in its own transaction.
|
||
*/
|
||
class CollectionTransaction {
|
||
constructor(collection, adapterTransaction) {
|
||
this.collection = collection;
|
||
this.adapterTransaction = adapterTransaction;
|
||
this._events = [];
|
||
}
|
||
_queueEvent(action, payload) {
|
||
this._events.push({ action, payload });
|
||
}
|
||
/**
|
||
* Emit queued events, to be called once every transaction operations have
|
||
* been executed successfully.
|
||
*/
|
||
emitEvents() {
|
||
for (const { action, payload } of this._events) {
|
||
this.collection.events.emit(action, payload);
|
||
}
|
||
if (this._events.length > 0) {
|
||
const targets = this._events.map(({ action, payload }) => (Object.assign({ action }, payload)));
|
||
this.collection.events.emit("change", { targets });
|
||
}
|
||
this._events = [];
|
||
}
|
||
/**
|
||
* Retrieve a record by its id from the local database, or
|
||
* undefined if none exists.
|
||
*
|
||
* This will also return virtually deleted records.
|
||
*
|
||
* @param {String} id
|
||
* @return {Object}
|
||
*/
|
||
getAny(id) {
|
||
const record = this.adapterTransaction.get(id);
|
||
return { data: record, permissions: {} };
|
||
}
|
||
/**
|
||
* Retrieve a record by its id from the local database.
|
||
*
|
||
* Options:
|
||
* - {Boolean} includeDeleted: Include virtually deleted records.
|
||
*
|
||
* @param {String} id
|
||
* @param {Object} options
|
||
* @return {Object}
|
||
*/
|
||
get(id, options = { includeDeleted: false }) {
|
||
const res = this.getAny(id);
|
||
if (!res.data ||
|
||
(!options.includeDeleted && res.data._status === "deleted")) {
|
||
throw new Error(`Record with id=${id} not found.`);
|
||
}
|
||
return res;
|
||
}
|
||
/**
|
||
* Deletes a record from the local database.
|
||
*
|
||
* Options:
|
||
* - {Boolean} virtual: When set to `true`, doesn't actually delete the record,
|
||
* update its `_status` attribute to `deleted` instead (default: true)
|
||
*
|
||
* @param {String} id The record's Id.
|
||
* @param {Object} options The options object.
|
||
* @return {Object}
|
||
*/
|
||
delete(id, options = { virtual: true }) {
|
||
// Ensure the record actually exists.
|
||
const existing = this.adapterTransaction.get(id);
|
||
const alreadyDeleted = existing && existing._status == "deleted";
|
||
if (!existing || (alreadyDeleted && options.virtual)) {
|
||
throw new Error(`Record with id=${id} not found.`);
|
||
}
|
||
// Virtual updates status.
|
||
if (options.virtual) {
|
||
this.adapterTransaction.update(markDeleted(existing));
|
||
}
|
||
else {
|
||
// Delete for real.
|
||
this.adapterTransaction.delete(id);
|
||
}
|
||
this._queueEvent("delete", { data: existing });
|
||
return { data: existing, permissions: {} };
|
||
}
|
||
/**
|
||
* Soft delete all records from the local database.
|
||
*
|
||
* @param {Array} ids Array of non-deleted Record Ids.
|
||
* @return {Object}
|
||
*/
|
||
deleteAll(ids) {
|
||
const existingRecords = [];
|
||
ids.forEach(id => {
|
||
existingRecords.push(this.adapterTransaction.get(id));
|
||
this.delete(id);
|
||
});
|
||
this._queueEvent("deleteAll", { data: existingRecords });
|
||
return { data: existingRecords, permissions: {} };
|
||
}
|
||
/**
|
||
* Deletes a record from the local database, if any exists.
|
||
* Otherwise, do nothing.
|
||
*
|
||
* @param {String} id The record's Id.
|
||
* @return {Object}
|
||
*/
|
||
deleteAny(id) {
|
||
const existing = this.adapterTransaction.get(id);
|
||
if (existing) {
|
||
this.adapterTransaction.update(markDeleted(existing));
|
||
this._queueEvent("delete", { data: existing });
|
||
}
|
||
return { data: Object.assign({ id }, existing), deleted: !!existing, permissions: {} };
|
||
}
|
||
/**
|
||
* Adds a record to the local database, asserting that none
|
||
* already exist with this ID.
|
||
*
|
||
* @param {Object} record, which must contain an ID
|
||
* @return {Object}
|
||
*/
|
||
create(record) {
|
||
if (typeof record !== "object") {
|
||
throw new Error("Record is not an object.");
|
||
}
|
||
if (!Object.prototype.hasOwnProperty.call(record, "id")) {
|
||
throw new Error("Cannot create a record missing id");
|
||
}
|
||
if (!this.collection.idSchema.validate(record.id)) {
|
||
throw new Error(`Invalid Id: ${record.id}`);
|
||
}
|
||
this.adapterTransaction.create(record);
|
||
this._queueEvent("create", { data: record });
|
||
return { data: record, permissions: {} };
|
||
}
|
||
/**
|
||
* Updates a record from the local database.
|
||
*
|
||
* Options:
|
||
* - {Boolean} synced: Sets record status to "synced" (default: false)
|
||
* - {Boolean} patch: Extends the existing record instead of overwriting it
|
||
* (default: false)
|
||
*
|
||
* @param {Object} record
|
||
* @param {Object} options
|
||
* @return {Object}
|
||
*/
|
||
update(record, options = { synced: false, patch: false }) {
|
||
if (typeof record !== "object") {
|
||
throw new Error("Record is not an object.");
|
||
}
|
||
if (!Object.prototype.hasOwnProperty.call(record, "id")) {
|
||
throw new Error("Cannot update a record missing id.");
|
||
}
|
||
if (!this.collection.idSchema.validate(record.id)) {
|
||
throw new Error(`Invalid Id: ${record.id}`);
|
||
}
|
||
const oldRecord = this.adapterTransaction.get(record.id);
|
||
if (!oldRecord) {
|
||
throw new Error(`Record with id=${record.id} not found.`);
|
||
}
|
||
const newRecord = options.patch ? Object.assign(Object.assign({}, oldRecord), record) : record;
|
||
const updated = this._updateRaw(oldRecord, newRecord, options);
|
||
this.adapterTransaction.update(updated);
|
||
this._queueEvent("update", { data: updated, oldRecord });
|
||
return { data: updated, oldRecord, permissions: {} };
|
||
}
|
||
/**
|
||
* Lower-level primitive for updating a record while respecting
|
||
* _status and last_modified.
|
||
*
|
||
* @param {Object} oldRecord: the record retrieved from the DB
|
||
* @param {Object} newRecord: the record to replace it with
|
||
* @return {Object}
|
||
*/
|
||
_updateRaw(oldRecord, newRecord, { synced = false } = {}) {
|
||
const updated = Object.assign({}, newRecord);
|
||
// Make sure to never loose the existing timestamp.
|
||
if (oldRecord && oldRecord.last_modified && !updated.last_modified) {
|
||
updated.last_modified = oldRecord.last_modified;
|
||
}
|
||
// If only local fields have changed, then keep record as synced.
|
||
// If status is created, keep record as created.
|
||
// If status is deleted, mark as updated.
|
||
const isIdentical = oldRecord &&
|
||
recordsEqual(oldRecord, updated, this.collection.localFields);
|
||
const keepSynced = isIdentical && oldRecord._status == "synced";
|
||
const neverSynced = !oldRecord || (oldRecord && oldRecord._status == "created");
|
||
const newStatus = keepSynced || synced ? "synced" : neverSynced ? "created" : "updated";
|
||
return markStatus(updated, newStatus);
|
||
}
|
||
/**
|
||
* Upsert a record into the local database.
|
||
*
|
||
* This record must have an ID.
|
||
*
|
||
* If a record with this ID already exists, it will be replaced.
|
||
* Otherwise, this record will be inserted.
|
||
*
|
||
* @param {Object} record
|
||
* @return {Object}
|
||
*/
|
||
upsert(record) {
|
||
if (typeof record !== "object") {
|
||
throw new Error("Record is not an object.");
|
||
}
|
||
if (!Object.prototype.hasOwnProperty.call(record, "id")) {
|
||
throw new Error("Cannot update a record missing id.");
|
||
}
|
||
if (!this.collection.idSchema.validate(record.id)) {
|
||
throw new Error(`Invalid Id: ${record.id}`);
|
||
}
|
||
let oldRecord = this.adapterTransaction.get(record.id);
|
||
const updated = this._updateRaw(oldRecord, record);
|
||
this.adapterTransaction.update(updated);
|
||
// Don't return deleted records -- pretend they are gone
|
||
if (oldRecord && oldRecord._status == "deleted") {
|
||
oldRecord = undefined;
|
||
}
|
||
if (oldRecord) {
|
||
this._queueEvent("update", { data: updated, oldRecord });
|
||
}
|
||
else {
|
||
this._queueEvent("create", { data: updated });
|
||
}
|
||
return { data: updated, oldRecord, permissions: {} };
|
||
}
|
||
}
|
||
|
||
const DEFAULT_BUCKET_NAME = "default";
|
||
const DEFAULT_REMOTE = "http://localhost:8888/v1";
|
||
const DEFAULT_RETRY = 1;
|
||
/**
|
||
* KintoBase class.
|
||
*/
|
||
class KintoBase {
|
||
/**
|
||
* Provides a public access to the base adapter class. Users can create a
|
||
* custom DB adapter by extending {@link BaseAdapter}.
|
||
*
|
||
* @type {Object}
|
||
*/
|
||
static get adapters() {
|
||
return {
|
||
BaseAdapter: BaseAdapter,
|
||
};
|
||
}
|
||
/**
|
||
* Synchronization strategies. Available strategies are:
|
||
*
|
||
* - `MANUAL`: Conflicts will be reported in a dedicated array.
|
||
* - `SERVER_WINS`: Conflicts are resolved using remote data.
|
||
* - `CLIENT_WINS`: Conflicts are resolved using local data.
|
||
*
|
||
* @type {Object}
|
||
*/
|
||
static get syncStrategy() {
|
||
return Collection.strategy;
|
||
}
|
||
/**
|
||
* Constructor.
|
||
*
|
||
* Options:
|
||
* - `{String}` `remote` The server URL to use.
|
||
* - `{String}` `bucket` The collection bucket name.
|
||
* - `{EventEmitter}` `events` Events handler.
|
||
* - `{BaseAdapter}` `adapter` The base DB adapter class.
|
||
* - `{Object}` `adapterOptions` Options given to the adapter.
|
||
* - `{Object}` `headers` The HTTP headers to use.
|
||
* - `{Object}` `retry` Number of retries when the server fails to process the request (default: `1`)
|
||
* - `{String}` `requestMode` The HTTP CORS mode to use.
|
||
* - `{Number}` `timeout` The requests timeout in ms (default: `5000`).
|
||
*
|
||
* @param {Object} options The options object.
|
||
*/
|
||
constructor(options = {}) {
|
||
const defaults = {
|
||
bucket: DEFAULT_BUCKET_NAME,
|
||
remote: DEFAULT_REMOTE,
|
||
retry: DEFAULT_RETRY,
|
||
};
|
||
this._options = Object.assign(Object.assign({}, defaults), options);
|
||
if (!this._options.adapter) {
|
||
throw new Error("No adapter provided");
|
||
}
|
||
this._api = null;
|
||
/**
|
||
* The event emitter instance.
|
||
* @type {EventEmitter}
|
||
*/
|
||
this.events = this._options.events;
|
||
}
|
||
/**
|
||
* The kinto HTTP client instance.
|
||
* @type {KintoClient}
|
||
*/
|
||
get api() {
|
||
const { events, headers, remote, requestMode, retry, timeout, } = this._options;
|
||
if (!this._api) {
|
||
this._api = new this.ApiClass(remote, {
|
||
events,
|
||
headers,
|
||
requestMode,
|
||
retry,
|
||
timeout,
|
||
});
|
||
}
|
||
return this._api;
|
||
}
|
||
/**
|
||
* Creates a {@link Collection} instance. The second (optional) parameter
|
||
* will set collection-level options like e.g. `remoteTransformers`.
|
||
*
|
||
* @param {String} collName The collection name.
|
||
* @param {Object} [options={}] Extra options or override client's options.
|
||
* @param {Object} [options.idSchema] IdSchema instance (default: UUID)
|
||
* @param {Object} [options.remoteTransformers] Array<RemoteTransformer> (default: `[]`])
|
||
* @param {Object} [options.hooks] Array<Hook> (default: `[]`])
|
||
* @param {Object} [options.localFields] Array<Field> (default: `[]`])
|
||
* @return {Collection}
|
||
*/
|
||
collection(collName, options = {}) {
|
||
if (!collName) {
|
||
throw new Error("missing collection name");
|
||
}
|
||
const { bucket, events, adapter, adapterOptions } = Object.assign(Object.assign({}, this._options), options);
|
||
const { idSchema, remoteTransformers, hooks, localFields } = options;
|
||
return new Collection(bucket, collName, this, {
|
||
events,
|
||
adapter,
|
||
adapterOptions,
|
||
idSchema,
|
||
remoteTransformers,
|
||
hooks,
|
||
localFields,
|
||
});
|
||
}
|
||
}
|
||
|
||
/*
|
||
*
|
||
* Licensed 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.
|
||
*/
|
||
ChromeUtils.import("resource://gre/modules/Timer.jsm", global);
|
||
const { XPCOMUtils } = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
|
||
XPCOMUtils.defineLazyGlobalGetters(global, ["fetch", "indexedDB"]);
|
||
ChromeUtils.defineModuleGetter(global, "EventEmitter", "resource://gre/modules/EventEmitter.jsm");
|
||
// Use standalone kinto-http module landed in FFx.
|
||
ChromeUtils.defineModuleGetter(global, "KintoHttpClient", "resource://services-common/kinto-http-client.js");
|
||
XPCOMUtils.defineLazyGetter(global, "generateUUID", () => {
|
||
const { generateUUID } = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator);
|
||
return generateUUID;
|
||
});
|
||
class Kinto extends KintoBase {
|
||
static get adapters() {
|
||
return {
|
||
BaseAdapter,
|
||
IDB,
|
||
};
|
||
}
|
||
get ApiClass() {
|
||
return KintoHttpClient;
|
||
}
|
||
constructor(options = {}) {
|
||
const events = {};
|
||
EventEmitter.decorate(events);
|
||
const defaults = {
|
||
adapter: IDB,
|
||
events,
|
||
};
|
||
super(Object.assign(Object.assign({}, defaults), options));
|
||
}
|
||
collection(collName, options = {}) {
|
||
const idSchema = {
|
||
validate(id) {
|
||
return typeof id == "string" && RE_RECORD_ID.test(id);
|
||
},
|
||
generate() {
|
||
return generateUUID()
|
||
.toString()
|
||
.replace(/[{}]/g, "");
|
||
},
|
||
};
|
||
return super.collection(collName, Object.assign({ idSchema }, options));
|
||
}
|
||
}
|
||
|
||
return Kinto;
|
||
|
||
})));
|