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authorwolfbeast <mcwerewolf@gmail.com>2018-10-06 06:57:51 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-10-06 06:57:51 +0200
commit0c47c83e1b3b7d95681a43fbb0de0e17b2cd5b25 (patch)
treec321601f04cbfd02fb6e12878e745dc49a612c86 /services/sync/modules/collection_validator.js
parent8860eddcee1417483cafd114f3a9ec127e0f1f74 (diff)
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Import Tycho weave client
Diffstat (limited to 'services/sync/modules/collection_validator.js')
-rw-r--r--services/sync/modules/collection_validator.js204
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diff --git a/services/sync/modules/collection_validator.js b/services/sync/modules/collection_validator.js
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-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-const Cu = Components.utils;
-
-Cu.import("resource://services-sync/record.js");
-Cu.import("resource://services-sync/main.js");
-
-this.EXPORTED_SYMBOLS = ["CollectionValidator", "CollectionProblemData"];
-
-class CollectionProblemData {
- constructor() {
- this.missingIDs = 0;
- this.duplicates = [];
- this.clientMissing = [];
- this.serverMissing = [];
- this.serverDeleted = [];
- this.serverUnexpected = [];
- this.differences = [];
- }
-
- /**
- * Produce a list summarizing problems found. Each entry contains {name, count},
- * where name is the field name for the problem, and count is the number of times
- * the problem was encountered.
- *
- * Validation has failed if all counts are not 0.
- */
- getSummary() {
- return [
- { name: "clientMissing", count: this.clientMissing.length },
- { name: "serverMissing", count: this.serverMissing.length },
- { name: "serverDeleted", count: this.serverDeleted.length },
- { name: "serverUnexpected", count: this.serverUnexpected.length },
- { name: "differences", count: this.differences.length },
- { name: "missingIDs", count: this.missingIDs },
- { name: "duplicates", count: this.duplicates.length }
- ];
- }
-}
-
-class CollectionValidator {
- // Construct a generic collection validator. This is intended to be called by
- // subclasses.
- // - name: Name of the engine
- // - idProp: Property that identifies a record. That is, if a client and server
- // record have the same value for the idProp property, they should be
- // compared against eachother.
- // - props: Array of properties that should be compared
- constructor(name, idProp, props) {
- this.name = name;
- this.props = props;
- this.idProp = idProp;
- }
-
- // Should a custom ProblemData type be needed, return it here.
- emptyProblemData() {
- return new CollectionProblemData();
- }
-
- getServerItems(engine) {
- let collection = engine.itemSource();
- let collectionKey = engine.service.collectionKeys.keyForCollection(engine.name);
- collection.full = true;
- let items = [];
- collection.recordHandler = function(item) {
- item.decrypt(collectionKey);
- items.push(item.cleartext);
- };
- let resp = collection.getBatched();
- if (!resp.success) {
- throw resp;
- }
- return items;
- }
-
- // Should return a promise that resolves to an array of client items.
- getClientItems() {
- return Promise.reject("Must implement");
- }
-
- // Turn the client item into something that can be compared with the server item,
- // and is also safe to mutate.
- normalizeClientItem(item) {
- return Cu.cloneInto(item, {});
- }
-
- // Turn the server item into something that can be easily compared with the client
- // items.
- normalizeServerItem(item) {
- return item;
- }
-
- // Return whether or not a server item should be present on the client. Expected
- // to be overridden.
- clientUnderstands(item) {
- return true;
- }
-
- // Return whether or not a client item should be present on the server. Expected
- // to be overridden
- syncedByClient(item) {
- return true;
- }
-
- // Compare the server item and the client item, and return a list of property
- // names that are different. Can be overridden if needed.
- getDifferences(client, server) {
- let differences = [];
- for (let prop of this.props) {
- let clientProp = client[prop];
- let serverProp = server[prop];
- if ((clientProp || "") !== (serverProp || "")) {
- differences.push(prop);
- }
- }
- return differences;
- }
-
- // Returns an object containing
- // problemData: an instance of the class returned by emptyProblemData(),
- // clientRecords: Normalized client records
- // records: Normalized server records,
- // deletedRecords: Array of ids that were marked as deleted by the server.
- compareClientWithServer(clientItems, serverItems) {
- clientItems = clientItems.map(item => this.normalizeClientItem(item));
- serverItems = serverItems.map(item => this.normalizeServerItem(item));
- let problems = this.emptyProblemData();
- let seenServer = new Map();
- let serverDeleted = new Set();
- let allRecords = new Map();
-
- for (let record of serverItems) {
- let id = record[this.idProp];
- if (!id) {
- ++problems.missingIDs;
- continue;
- }
- if (record.deleted) {
- serverDeleted.add(record);
- } else {
- let possibleDupe = seenServer.get(id);
- if (possibleDupe) {
- problems.duplicates.push(id);
- } else {
- seenServer.set(id, record);
- allRecords.set(id, { server: record, client: null, });
- }
- record.understood = this.clientUnderstands(record);
- }
- }
-
- let recordPairs = [];
- let seenClient = new Map();
- for (let record of clientItems) {
- let id = record[this.idProp];
- record.shouldSync = this.syncedByClient(record);
- seenClient.set(id, record);
- let combined = allRecords.get(id);
- if (combined) {
- combined.client = record;
- } else {
- allRecords.set(id, { client: record, server: null });
- }
- }
-
- for (let [id, { server, client }] of allRecords) {
- if (!client && !server) {
- throw new Error("Impossible: no client or server record for " + id);
- } else if (server && !client) {
- if (server.understood) {
- problems.clientMissing.push(id);
- }
- } else if (client && !server) {
- if (client.shouldSync) {
- problems.serverMissing.push(id);
- }
- } else {
- if (!client.shouldSync) {
- if (!problems.serverUnexpected.includes(id)) {
- problems.serverUnexpected.push(id);
- }
- continue;
- }
- let differences = this.getDifferences(client, server);
- if (differences && differences.length) {
- problems.differences.push({ id, differences });
- }
- }
- }
- return {
- problemData: problems,
- clientRecords: clientItems,
- records: serverItems,
- deletedRecords: [...serverDeleted]
- };
- }
-}
-
-// Default to 0, some engines may override.
-CollectionValidator.prototype.version = 0;