'update'
[vchess.git] / client / src / utils / importgameStorage.js
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1// Game object struct: see gameStorgae.js
2
3import { store } from "@/store";
4
5function dbOperation(callback) {
6 let db = null;
7 let DBOpenRequest = window.indexedDB.open("vchess_import", 4);
8
9 DBOpenRequest.onerror = function(event) {
10 alert(store.state.tr[
11 "Database error: stop private browsing, or update your browser"]);
12 callback("error", null);
13 };
14
15 DBOpenRequest.onsuccess = function() {
16 db = DBOpenRequest.result;
17 callback(null, db);
18 db.close();
19 };
20
21 DBOpenRequest.onupgradeneeded = function(event) {
22 let db = event.target.result;
23 let upgradeTransaction = event.target.transaction;
24 let objectStore = undefined;
25 if (!db.objectStoreNames.contains("importgames"))
26 objectStore = db.createObjectStore("importgames", { keyPath: "id" });
27 else
28 objectStore = upgradeTransaction.objectStore("importgames");
29 if (!objectStore.indexNames.contains("created"))
30 // To search by date intervals. Two games could start at the same time
31 objectStore.createIndex("created", "created", { unique: false });
32 };
33}
34
35export const ImportgameStorage = {
937c24ab 36
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37 // Optional callback to get error status
38 add: function(game, callback) {
39 dbOperation((err, db) => {
40 if (!!err) {
41 callback("error");
42 return;
43 }
44 let transaction = db.transaction("importgames", "readwrite");
45 transaction.oncomplete = function() {
46 // Everything's fine
47 callback();
48 };
49 transaction.onerror = function(err) {
50 // Duplicate key error (most likely)
1ef65040 51 callback(err.target.error);
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52 };
53 transaction.objectStore("importgames").add(game);
54 });
55 },
56
57 // Retrieve next imported games
58 getNext: function(upperDt, callback) {
59 dbOperation((err, db) => {
60 let objectStore = db
61 .transaction("importgames", "readonly")
62 .objectStore("importgames");
63 let index = objectStore.index("created");
64 const range = IDBKeyRange.upperBound(upperDt);
65 let games = [];
66 index.openCursor(range).onsuccess = function(event) {
67 let cursor = event.target.result;
68 if (!cursor) {
69 // Most recent games first:
70 games = games.sort((g1, g2) => g2.created - g1.created);
71 // TODO: 20 games showed per request is arbitrary
72 callback(games.slice(0, 20));
73 }
74 else {
75 // If there is still another cursor to go, keep running this code
76 let g = cursor.value;
77 // Do not retrieve moves or clocks (unused in list mode)
78 g.movesCount = g.moves.length;
79 delete g.moves;
80 delete g.clocks;
81 delete g.initime;
82 games.push(g);
83 cursor.continue();
84 }
85 };
86 });
87 },
88
89 // Retrieve any game from its identifier.
90 // NOTE: need callback because result is obtained asynchronously
91 get: function(gameId, callback) {
92 dbOperation((err, db) => {
93 let objectStore =
94 db.transaction("importgames").objectStore("importgames");
95 objectStore.get(gameId).onsuccess = function(event) {
96 // event.target.result is null if game not found
97 callback(event.target.result);
98 };
99 });
100 },
101
102 // Delete a game in indexedDB
103 remove: function(gameId, callback) {
104 dbOperation((err, db) => {
105 if (!err) {
106 let transaction = db.transaction("importgames", "readwrite");
107 transaction.oncomplete = function() {
108 callback(); //everything's fine
109 };
110 transaction.objectStore("importgames").delete(gameId);
111 }
112 });
113 }
937c24ab 114
5f918a27 115};