1 | ;
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2 |
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3 | var _create = require("babel-runtime/core-js/object/create");
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4 |
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5 | var _create2 = _interopRequireDefault(_create);
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6 |
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7 | var _keys = require("babel-runtime/core-js/object/keys");
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8 |
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9 | var _keys2 = _interopRequireDefault(_keys);
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10 |
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11 | var _classCallCheck2 = require("babel-runtime/helpers/classCallCheck");
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12 |
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13 | var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);
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14 |
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15 | var _createClass2 = require("babel-runtime/helpers/createClass");
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16 |
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17 | var _createClass3 = _interopRequireDefault(_createClass2);
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18 |
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19 | var _utils = require("./utils");
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20 |
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21 | var _utils2 = _interopRequireDefault(_utils);
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22 |
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23 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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24 |
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25 | /**
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26 | * The purpose of this class is to accumulate /sync responses such that a
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27 | * complete "initial" JSON response can be returned which accurately represents
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28 | * the sum total of the /sync responses accumulated to date. It only handles
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29 | * room data: that is, everything under the "rooms" top-level key.
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30 | *
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31 | * This class is used when persisting room data so a complete /sync response can
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32 | * be loaded from disk and incremental syncs can be performed on the server,
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33 | * rather than asking the server to do an initial sync on startup.
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34 | */
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35 | var SyncAccumulator = function () {
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36 | /**
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37 | * @param {Object} opts
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38 | * @param {Number=} opts.maxTimelineEntries The ideal maximum number of
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39 | * timeline entries to keep in the sync response. This is best-effort, as
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40 | * clients do not always have a back-pagination token for each event, so
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41 | * it's possible there may be slightly *less* than this value. There will
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42 | * never be more. This cannot be 0 or else it makes it impossible to scroll
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43 | * back in a room. Default: 50.
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44 | */
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45 | function SyncAccumulator(opts) {
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46 | (0, _classCallCheck3.default)(this, SyncAccumulator);
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47 |
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48 | opts = opts || {};
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49 | opts.maxTimelineEntries = opts.maxTimelineEntries || 50;
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50 | this.opts = opts;
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51 | this.accountData = {
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52 | //$event_type: Object
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53 | };
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54 | this.inviteRooms = {
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55 | //$roomId: { ... sync 'invite' json data ... }
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56 | };
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57 | this.joinRooms = {
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58 | //$roomId: {
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59 | // _currentState: { $event_type: { $state_key: json } },
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60 | // _timeline: [
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61 | // { event: $event, token: null|token },
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62 | // { event: $event, token: null|token },
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63 | // { event: $event, token: null|token },
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64 | // ...
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65 | // ],
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66 | // _summary: {
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67 | // m.heroes: [ $user_id ],
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68 | // m.joined_member_count: $count,
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69 | // m.invited_member_count: $count
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70 | // },
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71 | // _accountData: { $event_type: json },
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72 | // _unreadNotifications: { ... unread_notifications JSON ... },
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73 | // _readReceipts: { $user_id: { data: $json, eventId: $event_id }}
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74 | //}
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75 | };
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76 | // the /sync token which corresponds to the last time rooms were
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77 | // accumulated. We remember this so that any caller can obtain a
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78 | // coherent /sync response and know at what point they should be
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79 | // streaming from without losing events.
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80 | this.nextBatch = null;
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81 |
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82 | // { ('invite'|'join'|'leave'): $groupId: { ... sync 'group' data } }
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83 | this.groups = {
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84 | invite: {},
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85 | join: {},
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86 | leave: {}
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87 | };
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88 | }
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89 |
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90 | (0, _createClass3.default)(SyncAccumulator, [{
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91 | key: "accumulate",
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92 | value: function accumulate(syncResponse) {
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93 | this._accumulateRooms(syncResponse);
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94 | this._accumulateGroups(syncResponse);
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95 | this._accumulateAccountData(syncResponse);
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96 | this.nextBatch = syncResponse.next_batch;
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97 | }
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98 | }, {
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99 | key: "_accumulateAccountData",
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100 | value: function _accumulateAccountData(syncResponse) {
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101 | var _this = this;
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102 |
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103 | if (!syncResponse.account_data || !syncResponse.account_data.events) {
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104 | return;
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105 | }
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106 | // Clobbers based on event type.
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107 | syncResponse.account_data.events.forEach(function (e) {
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108 | _this.accountData[e.type] = e;
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109 | });
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110 | }
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111 |
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112 | /**
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113 | * Accumulate incremental /sync room data.
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114 | * @param {Object} syncResponse the complete /sync JSON
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115 | */
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116 |
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117 | }, {
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118 | key: "_accumulateRooms",
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119 | value: function _accumulateRooms(syncResponse) {
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120 | var _this2 = this;
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121 |
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122 | if (!syncResponse.rooms) {
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123 | return;
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124 | }
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125 | if (syncResponse.rooms.invite) {
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126 | (0, _keys2.default)(syncResponse.rooms.invite).forEach(function (roomId) {
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127 | _this2._accumulateRoom(roomId, "invite", syncResponse.rooms.invite[roomId]);
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128 | });
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129 | }
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130 | if (syncResponse.rooms.join) {
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131 | (0, _keys2.default)(syncResponse.rooms.join).forEach(function (roomId) {
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132 | _this2._accumulateRoom(roomId, "join", syncResponse.rooms.join[roomId]);
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133 | });
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134 | }
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135 | if (syncResponse.rooms.leave) {
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136 | (0, _keys2.default)(syncResponse.rooms.leave).forEach(function (roomId) {
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137 | _this2._accumulateRoom(roomId, "leave", syncResponse.rooms.leave[roomId]);
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138 | });
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139 | }
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140 | }
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141 | }, {
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142 | key: "_accumulateRoom",
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143 | value: function _accumulateRoom(roomId, category, data) {
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144 | // Valid /sync state transitions
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145 | // +--------+ <======+ 1: Accept an invite
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146 | // +== | INVITE | | (5) 2: Leave a room
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147 | // | +--------+ =====+ | 3: Join a public room previously
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148 | // |(1) (4) | | left (handle as if new room)
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149 | // V (2) V | 4: Reject an invite
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150 | // +------+ ========> +--------+ 5: Invite to a room previously
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151 | // | JOIN | (3) | LEAVE* | left (handle as if new room)
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152 | // +------+ <======== +--------+
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153 | //
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154 | // * equivalent to "no state"
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155 | switch (category) {
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156 | case "invite":
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157 | // (5)
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158 | this._accumulateInviteState(roomId, data);
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159 | break;
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160 | case "join":
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161 | if (this.inviteRooms[roomId]) {
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162 | // (1)
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163 | // was previously invite, now join. We expect /sync to give
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164 | // the entire state and timeline on 'join', so delete previous
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165 | // invite state
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166 | delete this.inviteRooms[roomId];
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167 | }
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168 | // (3)
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169 | this._accumulateJoinState(roomId, data);
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170 | break;
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171 | case "leave":
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172 | if (this.inviteRooms[roomId]) {
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173 | // (4)
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174 | delete this.inviteRooms[roomId];
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175 | } else {
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176 | // (2)
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177 | delete this.joinRooms[roomId];
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178 | }
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179 | break;
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180 | default:
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181 | console.error("Unknown cateogory: ", category);
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182 | }
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183 | }
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184 | }, {
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185 | key: "_accumulateInviteState",
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186 | value: function _accumulateInviteState(roomId, data) {
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187 | if (!data.invite_state || !data.invite_state.events) {
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188 | // no new data
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189 | return;
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190 | }
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191 | if (!this.inviteRooms[roomId]) {
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192 | this.inviteRooms[roomId] = {
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193 | invite_state: data.invite_state
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194 | };
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195 | return;
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196 | }
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197 | // accumulate extra keys for invite->invite transitions
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198 | // clobber based on event type / state key
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199 | // We expect invite_state to be small, so just loop over the events
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200 | var currentData = this.inviteRooms[roomId];
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201 | data.invite_state.events.forEach(function (e) {
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202 | var hasAdded = false;
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203 | for (var i = 0; i < currentData.invite_state.events.length; i++) {
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204 | var current = currentData.invite_state.events[i];
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205 | if (current.type === e.type && current.state_key == e.state_key) {
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206 | currentData.invite_state.events[i] = e; // update
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207 | hasAdded = true;
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208 | }
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209 | }
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210 | if (!hasAdded) {
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211 | currentData.invite_state.events.push(e);
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212 | }
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213 | });
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214 | }
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215 |
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216 | // Accumulate timeline and state events in a room.
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217 |
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218 | }, {
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219 | key: "_accumulateJoinState",
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220 | value: function _accumulateJoinState(roomId, data) {
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221 | // We expect this function to be called a lot (every /sync) so we want
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222 | // this to be fast. /sync stores events in an array but we often want
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223 | // to clobber based on type/state_key. Rather than convert arrays to
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224 | // maps all the time, just keep private maps which contain
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225 | // the actual current accumulated sync state, and array-ify it when
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226 | // getJSON() is called.
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227 |
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228 | // State resolution:
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229 | // The 'state' key is the delta from the previous sync (or start of time
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230 | // if no token was supplied), to the START of the timeline. To obtain
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231 | // the current state, we need to "roll forward" state by reading the
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232 | // timeline. We want to store the current state so we can drop events
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233 | // out the end of the timeline based on opts.maxTimelineEntries.
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234 | //
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235 | // 'state' 'timeline' current state
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236 | // |-------x<======================>x
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237 | // T I M E
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238 | //
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239 | // When getJSON() is called, we 'roll back' the current state by the
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240 | // number of entries in the timeline to work out what 'state' should be.
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241 |
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242 | // Back-pagination:
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243 | // On an initial /sync, the server provides a back-pagination token for
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244 | // the start of the timeline. When /sync deltas come down, they also
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245 | // include back-pagination tokens for the start of the timeline. This
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246 | // means not all events in the timeline have back-pagination tokens, as
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247 | // it is only the ones at the START of the timeline which have them.
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248 | // In order for us to have a valid timeline (and back-pagination token
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249 | // to match), we need to make sure that when we remove old timeline
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250 | // events, that we roll forward to an event which has a back-pagination
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251 | // token. This means we can't keep a strict sliding-window based on
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252 | // opts.maxTimelineEntries, and we may have a few less. We should never
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253 | // have more though, provided that the /sync limit is less than or equal
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254 | // to opts.maxTimelineEntries.
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255 |
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256 | if (!this.joinRooms[roomId]) {
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257 | // Create truly empty objects so event types of 'hasOwnProperty' and co
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258 | // don't cause this code to break.
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259 | this.joinRooms[roomId] = {
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260 | _currentState: (0, _create2.default)(null),
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261 | _timeline: [],
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262 | _accountData: (0, _create2.default)(null),
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263 | _unreadNotifications: {},
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264 | _summary: {},
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265 | _readReceipts: {}
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266 | };
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267 | }
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268 | var currentData = this.joinRooms[roomId];
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269 |
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270 | if (data.account_data && data.account_data.events) {
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271 | // clobber based on type
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272 | data.account_data.events.forEach(function (e) {
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273 | currentData._accountData[e.type] = e;
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274 | });
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275 | }
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276 |
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277 | // these probably clobber, spec is unclear.
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278 | if (data.unread_notifications) {
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279 | currentData._unreadNotifications = data.unread_notifications;
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280 | }
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281 | if (data.summary) {
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282 | var HEROES_KEY = "m.heroes";
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283 | var INVITED_COUNT_KEY = "m.invited_member_count";
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284 | var JOINED_COUNT_KEY = "m.joined_member_count";
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285 |
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286 | var acc = currentData._summary;
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287 | var sum = data.summary;
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288 | acc[HEROES_KEY] = sum[HEROES_KEY] || acc[HEROES_KEY];
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289 | acc[JOINED_COUNT_KEY] = sum[JOINED_COUNT_KEY] || acc[JOINED_COUNT_KEY];
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290 | acc[INVITED_COUNT_KEY] = sum[INVITED_COUNT_KEY] || acc[INVITED_COUNT_KEY];
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291 | }
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292 |
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293 | if (data.ephemeral && data.ephemeral.events) {
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294 | data.ephemeral.events.forEach(function (e) {
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295 | // We purposefully do not persist m.typing events.
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296 | // Technically you could refresh a browser before the timer on a
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297 | // typing event is up, so it'll look like you aren't typing when
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298 | // you really still are. However, the alternative is worse. If
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299 | // we do persist typing events, it will look like people are
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300 | // typing forever until someone really does start typing (which
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301 | // will prompt Synapse to send down an actual m.typing event to
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302 | // clobber the one we persisted).
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303 | if (e.type !== "m.receipt" || !e.content) {
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304 | // This means we'll drop unknown ephemeral events but that
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305 | // seems okay.
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306 | return;
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307 | }
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308 | // Handle m.receipt events. They clobber based on:
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309 | // (user_id, receipt_type)
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310 | // but they are keyed in the event as:
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311 | // content:{ $event_id: { $receipt_type: { $user_id: {json} }}}
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312 | // so store them in the former so we can accumulate receipt deltas
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313 | // quickly and efficiently (we expect a lot of them). Fold the
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314 | // receipt type into the key name since we only have 1 at the
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315 | // moment (m.read) and nested JSON objects are slower and more
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316 | // of a hassle to work with. We'll inflate this back out when
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317 | // getJSON() is called.
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318 | (0, _keys2.default)(e.content).forEach(function (eventId) {
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319 | if (!e.content[eventId]["m.read"]) {
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320 | return;
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321 | }
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322 | (0, _keys2.default)(e.content[eventId]["m.read"]).forEach(function (userId) {
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323 | // clobber on user ID
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324 | currentData._readReceipts[userId] = {
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325 | data: e.content[eventId]["m.read"][userId],
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326 | eventId: eventId
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327 | };
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328 | });
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329 | });
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330 | });
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331 | }
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332 |
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333 | // if we got a limited sync, we need to remove all timeline entries or else
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334 | // we will have gaps in the timeline.
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335 | if (data.timeline && data.timeline.limited) {
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336 | currentData._timeline = [];
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337 | }
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338 |
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339 | // Work out the current state. The deltas need to be applied in the order:
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340 | // - existing state which didn't come down /sync.
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341 | // - State events under the 'state' key.
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342 | // - State events in the 'timeline'.
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343 | if (data.state && data.state.events) {
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344 | data.state.events.forEach(function (e) {
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345 | setState(currentData._currentState, e);
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346 | });
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347 | }
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348 | if (data.timeline && data.timeline.events) {
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349 | data.timeline.events.forEach(function (e, index) {
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350 | // this nops if 'e' isn't a state event
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351 | setState(currentData._currentState, e);
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352 | // append the event to the timeline. The back-pagination token
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353 | // corresponds to the first event in the timeline
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354 | currentData._timeline.push({
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355 | event: e,
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356 | token: index === 0 ? data.timeline.prev_batch : null
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357 | });
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358 | });
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359 | }
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360 |
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361 | // attempt to prune the timeline by jumping between events which have
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362 | // pagination tokens.
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363 | if (currentData._timeline.length > this.opts.maxTimelineEntries) {
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364 | var startIndex = currentData._timeline.length - this.opts.maxTimelineEntries;
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365 | for (var i = startIndex; i < currentData._timeline.length; i++) {
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366 | if (currentData._timeline[i].token) {
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367 | // keep all events after this, including this one
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368 | currentData._timeline = currentData._timeline.slice(i, currentData._timeline.length);
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369 | break;
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370 | }
|
371 | }
|
372 | }
|
373 | }
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374 |
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375 | /**
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376 | * Accumulate incremental /sync group data.
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377 | * @param {Object} syncResponse the complete /sync JSON
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378 | */
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379 |
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380 | }, {
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381 | key: "_accumulateGroups",
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382 | value: function _accumulateGroups(syncResponse) {
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383 | var _this3 = this;
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384 |
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385 | if (!syncResponse.groups) {
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386 | return;
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387 | }
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388 | if (syncResponse.groups.invite) {
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389 | (0, _keys2.default)(syncResponse.groups.invite).forEach(function (groupId) {
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390 | _this3._accumulateGroup(groupId, "invite", syncResponse.groups.invite[groupId]);
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391 | });
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392 | }
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393 | if (syncResponse.groups.join) {
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394 | (0, _keys2.default)(syncResponse.groups.join).forEach(function (groupId) {
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395 | _this3._accumulateGroup(groupId, "join", syncResponse.groups.join[groupId]);
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396 | });
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397 | }
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398 | if (syncResponse.groups.leave) {
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399 | (0, _keys2.default)(syncResponse.groups.leave).forEach(function (groupId) {
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400 | _this3._accumulateGroup(groupId, "leave", syncResponse.groups.leave[groupId]);
|
401 | });
|
402 | }
|
403 | }
|
404 | }, {
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405 | key: "_accumulateGroup",
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406 | value: function _accumulateGroup(groupId, category, data) {
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407 | var _arr = ['invite', 'join', 'leave'];
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408 |
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409 | for (var _i = 0; _i < _arr.length; _i++) {
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410 | var cat = _arr[_i];
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411 | delete this.groups[cat][groupId];
|
412 | }
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413 | this.groups[category][groupId] = data;
|
414 | }
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415 |
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416 | /**
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417 | * Return everything under the 'rooms' key from a /sync response which
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418 | * represents all room data that should be stored. This should be paired
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419 | * with the sync token which represents the most recent /sync response
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420 | * provided to accumulate().
|
421 | * @return {Object} An object with a "nextBatch", "roomsData" and "accountData"
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422 | * keys.
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423 | * The "nextBatch" key is a string which represents at what point in the
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424 | * /sync stream the accumulator reached. This token should be used when
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425 | * restarting a /sync stream at startup. Failure to do so can lead to missing
|
426 | * events. The "roomsData" key is an Object which represents the entire
|
427 | * /sync response from the 'rooms' key onwards. The "accountData" key is
|
428 | * a list of raw events which represent global account data.
|
429 | */
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430 |
|
431 | }, {
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432 | key: "getJSON",
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433 | value: function getJSON() {
|
434 | var _this4 = this;
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435 |
|
436 | var data = {
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437 | join: {},
|
438 | invite: {},
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439 | // always empty. This is set by /sync when a room was previously
|
440 | // in 'invite' or 'join'. On fresh startup, the client won't know
|
441 | // about any previous room being in 'invite' or 'join' so we can
|
442 | // just omit mentioning it at all, even if it has previously come
|
443 | // down /sync.
|
444 | // The notable exception is when a client is kicked or banned:
|
445 | // we may want to hold onto that room so the client can clearly see
|
446 | // why their room has disappeared. We don't persist it though because
|
447 | // it is unclear *when* we can safely remove the room from the DB.
|
448 | // Instead, we assume that if you're loading from the DB, you've
|
449 | // refreshed the page, which means you've seen the kick/ban already.
|
450 | leave: {}
|
451 | };
|
452 | (0, _keys2.default)(this.inviteRooms).forEach(function (roomId) {
|
453 | data.invite[roomId] = _this4.inviteRooms[roomId];
|
454 | });
|
455 | (0, _keys2.default)(this.joinRooms).forEach(function (roomId) {
|
456 | var roomData = _this4.joinRooms[roomId];
|
457 | var roomJson = {
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458 | ephemeral: { events: [] },
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459 | account_data: { events: [] },
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460 | state: { events: [] },
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461 | timeline: {
|
462 | events: [],
|
463 | prev_batch: null
|
464 | },
|
465 | unread_notifications: roomData._unreadNotifications,
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466 | summary: roomData._summary
|
467 | };
|
468 | // Add account data
|
469 | (0, _keys2.default)(roomData._accountData).forEach(function (evType) {
|
470 | roomJson.account_data.events.push(roomData._accountData[evType]);
|
471 | });
|
472 |
|
473 | // Add receipt data
|
474 | var receiptEvent = {
|
475 | type: "m.receipt",
|
476 | room_id: roomId,
|
477 | content: {
|
478 | // $event_id: { "m.read": { $user_id: $json } }
|
479 | }
|
480 | };
|
481 | (0, _keys2.default)(roomData._readReceipts).forEach(function (userId) {
|
482 | var receiptData = roomData._readReceipts[userId];
|
483 | if (!receiptEvent.content[receiptData.eventId]) {
|
484 | receiptEvent.content[receiptData.eventId] = {
|
485 | "m.read": {}
|
486 | };
|
487 | }
|
488 | receiptEvent.content[receiptData.eventId]["m.read"][userId] = receiptData.data;
|
489 | });
|
490 | // add only if we have some receipt data
|
491 | if ((0, _keys2.default)(receiptEvent.content).length > 0) {
|
492 | roomJson.ephemeral.events.push(receiptEvent);
|
493 | }
|
494 |
|
495 | // Add timeline data
|
496 | roomData._timeline.forEach(function (msgData) {
|
497 | if (!roomJson.timeline.prev_batch) {
|
498 | // the first event we add to the timeline MUST match up to
|
499 | // the prev_batch token.
|
500 | if (!msgData.token) {
|
501 | return; // this shouldn't happen as we prune constantly.
|
502 | }
|
503 | roomJson.timeline.prev_batch = msgData.token;
|
504 | }
|
505 | roomJson.timeline.events.push(msgData.event);
|
506 | });
|
507 |
|
508 | // Add state data: roll back current state to the start of timeline,
|
509 | // by "reverse clobbering" from the end of the timeline to the start.
|
510 | // Convert maps back into arrays.
|
511 | var rollBackState = (0, _create2.default)(null);
|
512 | for (var i = roomJson.timeline.events.length - 1; i >= 0; i--) {
|
513 | var timelineEvent = roomJson.timeline.events[i];
|
514 | if (timelineEvent.state_key === null || timelineEvent.state_key === undefined) {
|
515 | continue; // not a state event
|
516 | }
|
517 | // since we're going back in time, we need to use the previous
|
518 | // state value else we'll break causality. We don't have the
|
519 | // complete previous state event, so we need to create one.
|
520 | var prevStateEvent = _utils2.default.deepCopy(timelineEvent);
|
521 | if (prevStateEvent.unsigned) {
|
522 | if (prevStateEvent.unsigned.prev_content) {
|
523 | prevStateEvent.content = prevStateEvent.unsigned.prev_content;
|
524 | }
|
525 | if (prevStateEvent.unsigned.prev_sender) {
|
526 | prevStateEvent.sender = prevStateEvent.unsigned.prev_sender;
|
527 | }
|
528 | }
|
529 | setState(rollBackState, prevStateEvent);
|
530 | }
|
531 | (0, _keys2.default)(roomData._currentState).forEach(function (evType) {
|
532 | (0, _keys2.default)(roomData._currentState[evType]).forEach(function (stateKey) {
|
533 | var ev = roomData._currentState[evType][stateKey];
|
534 | if (rollBackState[evType] && rollBackState[evType][stateKey]) {
|
535 | // use the reverse clobbered event instead.
|
536 | ev = rollBackState[evType][stateKey];
|
537 | }
|
538 | roomJson.state.events.push(ev);
|
539 | });
|
540 | });
|
541 | data.join[roomId] = roomJson;
|
542 | });
|
543 |
|
544 | // Add account data
|
545 | var accData = [];
|
546 | (0, _keys2.default)(this.accountData).forEach(function (evType) {
|
547 | accData.push(_this4.accountData[evType]);
|
548 | });
|
549 |
|
550 | return {
|
551 | nextBatch: this.nextBatch,
|
552 | roomsData: data,
|
553 | groupsData: this.groups,
|
554 | accountData: accData
|
555 | };
|
556 | }
|
557 | }, {
|
558 | key: "getNextBatchToken",
|
559 | value: function getNextBatchToken() {
|
560 | return this.nextBatch;
|
561 | }
|
562 | }]);
|
563 | return SyncAccumulator;
|
564 | }(); /*
|
565 | Copyright 2017 Vector Creations Ltd
|
566 | Copyright 2018 New Vector Ltd
|
567 |
|
568 | Licensed under the Apache License, Version 2.0 (the "License");
|
569 | you may not use this file except in compliance with the License.
|
570 | You may obtain a copy of the License at
|
571 |
|
572 | http://www.apache.org/licenses/LICENSE-2.0
|
573 |
|
574 | Unless required by applicable law or agreed to in writing, software
|
575 | distributed under the License is distributed on an "AS IS" BASIS,
|
576 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
577 | See the License for the specific language governing permissions and
|
578 | limitations under the License.
|
579 | */
|
580 |
|
581 | /**
|
582 | * This is an internal module. See {@link SyncAccumulator} for the public class.
|
583 | * @module sync-accumulator
|
584 | */
|
585 |
|
586 | function setState(eventMap, event) {
|
587 | if (event.state_key === null || event.state_key === undefined || !event.type) {
|
588 | return;
|
589 | }
|
590 | if (!eventMap[event.type]) {
|
591 | eventMap[event.type] = (0, _create2.default)(null);
|
592 | }
|
593 | eventMap[event.type][event.state_key] = event;
|
594 | }
|
595 |
|
596 | module.exports = SyncAccumulator;
|
597 | //# sourceMappingURL=sync-accumulator.js.map |
\ | No newline at end of file |