@slate-sheikah/backend
Version:
slate-sheikah backend: Backend components for slate-sheikah. Slate + Automerge + Sockets
536 lines (435 loc) • 48.2 kB
JavaScript
;
var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports["default"] = void 0;
var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));
var _asyncToGenerator2 = _interopRequireDefault(require("@babel/runtime/helpers/asyncToGenerator"));
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _socket = _interopRequireDefault(require("socket.io"));
var Automerge = _interopRequireWildcard(require("automerge"));
var _debounce = _interopRequireDefault(require("lodash/debounce"));
var _bridge = require("@slate-sheikah/bridge");
var _AutomergeBackend = _interopRequireDefault(require("./AutomergeBackend"));
function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { (0, _defineProperty2["default"])(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
var SocketIOCollaboration = /*#__PURE__*/function () {
/**
* Constructor
*/
function SocketIOCollaboration(options) {
var _this = this;
(0, _classCallCheck2["default"])(this, SocketIOCollaboration);
(0, _defineProperty2["default"])(this, "io", void 0);
(0, _defineProperty2["default"])(this, "options", void 0);
(0, _defineProperty2["default"])(this, "backends", []);
(0, _defineProperty2["default"])(this, "backendCounts", []);
(0, _defineProperty2["default"])(this, "configure", function () {
return _this.io.of(_this.nspMiddleware).use(_this.authMiddleware).on('connect', _this.onConnect);
});
(0, _defineProperty2["default"])(this, "nspMiddleware", /*#__PURE__*/function () {
var _ref = (0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee(path, query, next) {
return _regenerator["default"].wrap(function _callee$(_context) {
while (1) {
switch (_context.prev = _context.next) {
case 0:
return _context.abrupt("return", next(null, true));
case 1:
case "end":
return _context.stop();
}
}
}, _callee);
}));
return function (_x, _x2, _x3) {
return _ref.apply(this, arguments);
};
}());
(0, _defineProperty2["default"])(this, "init", /*#__PURE__*/function () {
var _ref2 = (0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee3(socket) {
var path, _query, onDocumentLoad;
return _regenerator["default"].wrap(function _callee3$(_context3) {
while (1) {
switch (_context3.prev = _context3.next) {
case 0:
path = socket.nsp.name;
try {
_query = socket.handshake.query;
onDocumentLoad = _this.options.onDocumentLoad; //make some backends if this is the first time this meeting is loaded.
if (!_this.backends[path]) {
_this.backends[path] = {
id: Date.now(),
automerge: new _AutomergeBackend["default"](),
cleanupTimer: Math.floor(Date.now() / 1000) + (_this.options.cleanThreshold || 30) * 60,
loadDocument: (0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee2() {
var automerge, doc;
return _regenerator["default"].wrap(function _callee2$(_context2) {
while (1) {
switch (_context2.prev = _context2.next) {
case 0:
automerge = new _AutomergeBackend["default"]();
if (!onDocumentLoad) {
_context2.next = 7;
break;
}
_context2.next = 4;
return onDocumentLoad(path, _query);
case 4:
_context2.t0 = _context2.sent;
_context2.next = 8;
break;
case 7:
_context2.t0 = _this.options.defaultValue;
case 8:
doc = _context2.t0;
if (doc) {
automerge.appendDocument(path, doc);
_this.backends[path].automerge = automerge;
}
case 10:
case "end":
return _context2.stop();
}
}
}, _callee2);
}))()
};
_this.backendCounts[path] = 0;
_this.backends[path].presenceData = {};
}
} catch (e) {
console.log('Error in slate-collab init', e);
} //return a promise for creating the automergebackend so we can await on that being done
return _context3.abrupt("return", _this.backends[path].loadDocument);
case 3:
case "end":
return _context3.stop();
}
}
}, _callee3);
}));
return function (_x4) {
return _ref2.apply(this, arguments);
};
}());
(0, _defineProperty2["default"])(this, "authMiddleware", /*#__PURE__*/function () {
var _ref4 = (0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee4(socket, next) {
var query, onAuthRequest, permit;
return _regenerator["default"].wrap(function _callee4$(_context4) {
while (1) {
switch (_context4.prev = _context4.next) {
case 0:
query = socket.handshake.query;
onAuthRequest = _this.options.onAuthRequest;
if (!onAuthRequest) {
_context4.next = 8;
break;
}
_context4.next = 5;
return onAuthRequest(query, socket);
case 5:
permit = _context4.sent;
if (permit) {
_context4.next = 8;
break;
}
return _context4.abrupt("return", next(new Error("Authentication error: ".concat(socket.id))));
case 8:
return _context4.abrupt("return", next());
case 9:
case "end":
return _context4.stop();
}
}
}, _callee4);
}));
return function (_x5, _x6) {
return _ref4.apply(this, arguments);
};
}());
(0, _defineProperty2["default"])(this, "onConnect", /*#__PURE__*/function () {
var _ref5 = (0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee5(socket) {
var name, onSocketConnection, id, conn, presenceData, _doc;
return _regenerator["default"].wrap(function _callee5$(_context5) {
while (1) {
switch (_context5.prev = _context5.next) {
case 0:
_context5.prev = 0;
name = socket.nsp.name;
onSocketConnection = _this.options.onSocketConnection;
id = socket.id, conn = socket.conn; //try to pull presence data out of the payload.
presenceData = {};
try {
presenceData = JSON.parse(socket.handshake.query.presenceData);
} catch (e) {}
_context5.next = 8;
return _this.init(socket);
case 8:
_this.backendCounts[name] = _this.backendCounts[name] + 1;
_this.backends[name].presenceData[id] = presenceData;
_this.backends[name].automerge.createConnection(id, function (_ref6) {
var type = _ref6.type,
payload = _ref6.payload;
socket.compress(false).emit('msg', {
type: type,
payload: _objectSpread({
id: conn.id
}, payload)
});
});
socket.on('msg', _this.onMessage(id, name));
socket.on('flush', _this.onFlush(name));
socket.on('disconnect', _this.onDisconnect(id, socket));
_doc = _this.backends[name].automerge.getDocument(name); //send document
socket.compress(true).emit('msg', {
type: 'document',
id: _this.backends[name].id,
payload: Automerge.save(_doc)
}); //send presence information to namespace
_this.io.of(name).compress(false).emit('msg', {
type: 'participant',
payload: Object.values(_this.backends[name].presenceData)
});
_this.backends[name].automerge.openConnection(id);
_this.garbageCursors(name);
_context5.t0 = onSocketConnection;
if (!_context5.t0) {
_context5.next = 23;
break;
}
_context5.next = 23;
return onSocketConnection({
docId: name,
socket: socket,
_this: _this
});
case 23:
_context5.next = 28;
break;
case 25:
_context5.prev = 25;
_context5.t1 = _context5["catch"](0);
console.log('Error in slate-collab onConnect', _context5.t1);
case 28:
case "end":
return _context5.stop();
}
}
}, _callee5, null, [[0, 25]]);
}));
return function (_x7) {
return _ref5.apply(this, arguments);
};
}());
(0, _defineProperty2["default"])(this, "onMessage", function (id, name) {
return function (data) {
switch (data.type) {
case 'operation':
try {
_this.backends[name].automerge.receiveOperation(id, data);
_this.autoSaveDoc(name);
_this.garbageCursors(name);
} catch (e) {
console.log('Error in OnMessage/operation', e);
}
}
};
});
(0, _defineProperty2["default"])(this, "onFlush", function (name) {
return function (data) {
try {
console.log("Flushing document ".concat(name, " to the database."));
_this.autoSaveDoc(name);
} catch (e) {
console.log("Error flushing document ".concat(name, " to database"), e);
}
};
});
(0, _defineProperty2["default"])(this, "autoSaveDoc", function (name) {//noop to be overwritten by the constructor.
});
(0, _defineProperty2["default"])(this, "saveDocument", /*#__PURE__*/function () {
var _ref7 = (0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee6(docId) {
var onDocumentSave, _doc2;
return _regenerator["default"].wrap(function _callee6$(_context6) {
while (1) {
switch (_context6.prev = _context6.next) {
case 0:
_context6.prev = 0;
onDocumentSave = _this.options.onDocumentSave; //if the backend has already been cleaned up, stop trying to do this.
if (_this.backends[docId]) {
_context6.next = 4;
break;
}
return _context6.abrupt("return");
case 4:
_doc2 = _this.backends[docId].automerge.getDocument(docId);
if (_doc2) {
_context6.next = 7;
break;
}
throw new Error("Can't receive document by id: ".concat(docId));
case 7:
_context6.t0 = onDocumentSave;
if (!_context6.t0) {
_context6.next = 11;
break;
}
_context6.next = 11;
return onDocumentSave(docId, (0, _bridge.toJS)(_doc2.children));
case 11:
_context6.next = 16;
break;
case 13:
_context6.prev = 13;
_context6.t1 = _context6["catch"](0);
console.error('Error in saveDocument.', _context6.t1, docId);
case 16:
case "end":
return _context6.stop();
}
}
}, _callee6, null, [[0, 13]]);
}));
return function (_x8) {
return _ref7.apply(this, arguments);
};
}());
(0, _defineProperty2["default"])(this, "onDisconnect", function (id, socket) {
return /*#__PURE__*/(0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee7() {
var onSocketDisconnection, name;
return _regenerator["default"].wrap(function _callee7$(_context7) {
while (1) {
switch (_context7.prev = _context7.next) {
case 0:
_context7.prev = 0;
onSocketDisconnection = _this.options.onSocketDisconnection;
name = socket.nsp.name; //increment the cleanup timer
_this.backends[name].cleanupTimer = Math.floor(Date.now() / 1000) + (_this.options.cleanThreshold || 30) * 60;
/**
* wrap the automerge closeConnection call in a timeout to give any outstanding messages
* time to flush to the database
*/
setTimeout(function () {
_this.backends[name].automerge.closeConnection(id);
}, 5000);
_this.backendCounts[name] = _this.backendCounts[name] - 1;
delete _this.backends[name].presenceData[socket.id]; //send presence information to namespace
_this.io.of(name).compress(false).emit('msg', {
type: 'participant',
payload: Object.values(_this.backends[name].presenceData)
});
_context7.next = 10;
return _this.saveDocument(name);
case 10:
_this.garbageCursors(name);
_context7.t0 = onSocketDisconnection;
if (!_context7.t0) {
_context7.next = 15;
break;
}
_context7.next = 15;
return onSocketDisconnection({
docId: name,
socket: socket,
_this: _this
});
case 15:
_context7.next = 20;
break;
case 17:
_context7.prev = 17;
_context7.t1 = _context7["catch"](0);
console.log('Error in slate-collab onDisconnect', _context7.t1);
case 20:
case "end":
return _context7.stop();
}
}
}, _callee7, null, [[0, 17]]);
}));
});
(0, _defineProperty2["default"])(this, "garbageCursors", function (nsp) {
try {
var _Object$keys;
var _doc3 = _this.backends[nsp].automerge.getDocument(nsp);
if (!_doc3.cursors) return;
var namespace = _this.io.of(nsp);
(_Object$keys = Object.keys(_doc3 === null || _doc3 === void 0 ? void 0 : _doc3.cursors)) === null || _Object$keys === void 0 ? void 0 : _Object$keys.forEach(function (key) {
if (!namespace.sockets[key]) {
_this.backends[nsp].automerge.garbageCursor(nsp, key);
}
});
} catch (e) {//don't necessarily care if this fails.
}
});
(0, _defineProperty2["default"])(this, "destroy", /*#__PURE__*/(0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee8() {
return _regenerator["default"].wrap(function _callee8$(_context8) {
while (1) {
switch (_context8.prev = _context8.next) {
case 0:
_this.io.close();
case 1:
case "end":
return _context8.stop();
}
}
}, _callee8);
})));
this.io = (0, _socket["default"])(options.entry, _objectSpread(_objectSpread({}, options.connectOpts), {}, {
perMessageDeflate: true
}));
this.options = options;
this.configure();
this.autoSaveDoc = (0, _debounce["default"])(this.saveDocument, options.saveFrequency || 2000, {
maxWait: options.saveFrequency || 2000
});
this.backends = [];
this.backendCounts = []; //spawn cleaner
setInterval(function () {
_this.cleaner();
}, options.cleanFrequency || 60000);
return this;
}
/**
* Initial IO configuration
*/
(0, _createClass2["default"])(SocketIOCollaboration, [{
key: "cleaner",
/**
* memory cleaner process that checks the backeds to see if there aren't connections and if the timer has expired.
*/
value: function cleaner() {
var _this2 = this;
console.log('Cleaner running');
var targets = [];
try {
Object.keys(this.backends).forEach(function (key) {
if (_this2.backendCounts[key] === 0 && _this2.backends[key].cleanupTimer < Math.floor(Date.now() / 1000)) {
targets.push(key);
}
});
console.log("Found ".concat(targets.length, " documents to clean."));
if (targets.length) {
//free up that precious, precious memory.
targets.forEach(function (key) {
delete _this2.backends[key];
delete _this2.io.nsps[key];
delete _this2.backendCounts[key];
});
}
} catch (e) {
console.log('Error freeing memory', e);
}
}
/**
* SocketIO auth middleware. Used for user authentification.
*/
}]);
return SocketIOCollaboration;
}();
exports["default"] = SocketIOCollaboration;
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io from 'socket.io'\nimport * as Automerge from 'automerge'\nimport { Node } from 'slate'\nimport { Server } from 'http'\n\nimport debounce from 'lodash/debounce'\n\nimport { SyncDoc, CollabAction, toJS } from '@slate-sheikah/bridge'\n\nimport { getClients } from './utils'\n\nimport AutomergeBackend from './AutomergeBackend'\nimport { SocketIOConnection } from 'index'\n\nexport interface SocketIOCollaborationOptions {\n  entry: Server\n  connectOpts?: SocketIO.ServerOptions\n  defaultValue?: Node[]\n  saveFrequency?: number\n  cleanFrequency?: number\n  cleanThreshold?: number\n  onAuthRequest?: (\n    query: Object,\n    socket?: SocketIO.Socket\n  ) => Promise<boolean> | boolean\n  onDocumentLoad?: (\n    pathname: string,\n    query?: Object\n  ) => Promise<Node[]> | Node[]\n  onDocumentSave?: (pathname: string, doc: Node[]) => Promise<void> | void\n  onSocketConnection?: (\n    metadata: ConnectionCallbackMeta\n  ) => Promise<void> | void\n  onSocketDisconnection?: (\n    metadata: ConnectionCallbackMeta\n  ) => Promise<void> | void\n}\nexport interface BackendCounts {\n  [key: string]: number\n}\n\nexport interface ConnectionCallbackMeta {\n  docId: string\n  socket: SocketIO.Socket\n  _this: SocketIOConnection\n}\n\nexport interface Backends {\n  automerge: AutomergeBackend\n  ready: boolean\n  failed: boolean\n  cleanupTimer: number\n}\n\nexport default class SocketIOCollaboration {\n  private io: SocketIO.Server\n  private options: SocketIOCollaborationOptions\n  private backends: Backends[] = []\n  private backendCounts: BackendCounts[] = []\n\n  /**\n   * Constructor\n   */\n\n  constructor(options: SocketIOCollaborationOptions) {\n    this.io = io(options.entry, {\n      ...options.connectOpts,\n      perMessageDeflate: true\n    })\n\n    this.options = options\n\n    this.configure()\n\n    this.autoSaveDoc = debounce(\n      this.saveDocument,\n      options.saveFrequency || 2000,\n      {\n        maxWait: options.saveFrequency || 2000\n      }\n    )\n\n    this.backends = []\n    this.backendCounts = []\n\n    //spawn cleaner\n    setInterval(() => {\n      this.cleaner()\n    }, options.cleanFrequency || 60000)\n\n    return this\n  }\n\n  /**\n   * Initial IO configuration\n   */\n\n  private configure = () =>\n    this.io\n      .of(this.nspMiddleware)\n      .use(this.authMiddleware)\n      .on('connect', this.onConnect)\n\n  /**\n   * Namespace SocketIO middleware. Load document value and append it to CollaborationBackend.\n   */\n\n  private nspMiddleware = async (path: string, query: any, next: any) => {\n    return next(null, true)\n    //this is needed to set up the namespace, but it only runs once.\n    //the logic that WAS in here needs to be able to be ran multiple times.\n  }\n\n  /**\n   * init function to set up new documents is they don't exist.  These get cleaned up once\n   * all the sockets disconnect.\n   * @param socket\n   */\n  private init = async (socket: SocketIO.Socket) => {\n    const path = socket.nsp.name\n    try {\n      const query = socket.handshake.query\n      const { onDocumentLoad } = this.options\n\n      //make some backends if this is the first time this meeting is loaded.\n      if (!this.backends[path]) {\n        this.backends[path] = {\n          id: Date.now(),\n          automerge: new AutomergeBackend(),\n          cleanupTimer:\n            Math.floor(Date.now() / 1000) +\n            (this.options.cleanThreshold || 30) * 60,\n          loadDocument: (async () => {\n            const automerge = new AutomergeBackend()\n\n            const doc = onDocumentLoad\n              ? await onDocumentLoad(path, query)\n              : this.options.defaultValue\n\n            if (doc) {\n              automerge.appendDocument(path, doc)\n              this.backends[path].automerge = automerge\n            }\n          })()\n        }\n        this.backendCounts[path] = 0\n        this.backends[path].presenceData = {}\n      }\n    } catch (e) {\n      console.log('Error in slate-collab init', e)\n    }\n\n    //return a promise for creating the automergebackend so we can await on that being done\n    return this.backends[path].loadDocument\n  }\n\n  /**\n   * memory cleaner process that checks the backeds to see if there aren't connections and if the timer has expired.\n   */\n  private cleaner() {\n    console.log('Cleaner running')\n    const targets: string[] = []\n\n    try {\n      Object.keys(this.backends).forEach(key => {\n        if (\n          this.backendCounts[key] === 0 &&\n          this.backends[key].cleanupTimer < Math.floor(Date.now() / 1000)\n        ) {\n          targets.push(key)\n        }\n      })\n\n      console.log(`Found ${targets.length} documents to clean.`)\n      if (targets.length) {\n        //free up that precious, precious memory.\n        targets.forEach(key => {\n          delete this.backends[key]\n          delete this.io.nsps[key]\n          delete this.backendCounts[key]\n        })\n      }\n    } catch (e) {\n      console.log('Error freeing memory', e)\n    }\n  }\n\n  /**\n   * SocketIO auth middleware. Used for user authentification.\n   */\n\n  private authMiddleware = async (\n    socket: SocketIO.Socket,\n    next: (e?: any) => void\n  ) => {\n    const { query } = socket.handshake\n    const { onAuthRequest } = this.options\n\n    if (onAuthRequest) {\n      const permit = await onAuthRequest(query, socket)\n\n      if (!permit) return next(new Error(`Authentication error: ${socket.id}`))\n    }\n\n    return next()\n  }\n\n  /**\n   * On 'connect' handler.\n   */\n\n  private onConnect = async (socket: SocketIO.Socket) => {\n    try {\n      const { name } = socket.nsp\n      const { onSocketConnection } = this.options\n      const { id, conn } = socket\n\n      //try to pull presence data out of the payload.\n      let presenceData = {}\n      try {\n        presenceData = JSON.parse(socket.handshake.query.presenceData)\n      } catch (e) {}\n\n      await this.init(socket)\n      this.backendCounts[name] = this.backendCounts[name] + 1\n      this.backends[name].presenceData[id] = presenceData\n\n      this.backends[name].automerge.createConnection(\n        id,\n        ({ type, payload }: CollabAction) => {\n          socket\n            .compress(false)\n            .emit('msg', { type, payload: { id: conn.id, ...payload } })\n        }\n      )\n\n      socket.on('msg', this.onMessage(id, name))\n      socket.on('flush', this.onFlush(name))\n\n      socket.on('disconnect', this.onDisconnect(id, socket))\n\n      const doc = this.backends[name].automerge.getDocument(name)\n\n      //send document\n      socket.compress(true).emit('msg', {\n        type: 'document',\n        id: this.backends[name].id,\n        payload: Automerge.save<SyncDoc>(doc)\n      })\n\n      //send presence information to namespace\n      this.io\n        .of(name)\n        .compress(false)\n        .emit('msg', {\n          type: 'participant',\n          payload: Object.values(this.backends[name].presenceData)\n        })\n\n      this.backends[name].automerge.openConnection(id)\n\n      this.garbageCursors(name)\n\n      onSocketConnection &&\n        (await onSocketConnection({\n          docId: name,\n          socket,\n          _this: this\n        }))\n    } catch (e) {\n      console.log('Error in slate-collab onConnect', e)\n    }\n  }\n\n  /**\n   * On 'message' handler\n   */\n\n  private onMessage = (id: string, name: string) => (data: any) => {\n    switch (data.type) {\n      case 'operation':\n        try {\n          this.backends[name].automerge.receiveOperation(id, data)\n\n          this.autoSaveDoc(name)\n\n          this.garbageCursors(name)\n        } catch (e) {\n          console.log('Error in OnMessage/operation', e)\n        }\n    }\n  }\n\n  /**\n   * forces the backend to save the document\n   * @param name\n   */\n  private onFlush = (name: string) => (data: any) => {\n    try {\n      console.log(`Flushing document ${name} to the database.`)\n      this.autoSaveDoc(name)\n    } catch (e) {\n      console.log(`Error flushing document ${name} to database`, e)\n    }\n  }\n\n  private autoSaveDoc = (name: string) => {\n    //noop to be overwritten by the constructor.\n  }\n\n  /**\n   * Save document\n   */\n\n  private saveDocument = async (docId: string) => {\n    try {\n      const { onDocumentSave } = this.options\n\n      //if the backend has already been cleaned up, stop trying to do this.\n      if (!this.backends[docId]) {\n        return\n      }\n\n      const doc = this.backends[docId].automerge.getDocument(docId)\n\n      if (!doc) {\n        throw new Error(`Can't receive document by id: ${docId}`)\n      }\n\n      onDocumentSave && (await onDocumentSave(docId, toJS(doc.children)))\n    } catch (e) {\n      console.error('Error in saveDocument.', e, docId)\n    }\n  }\n\n  /**\n   * On 'disconnect' handler\n   */\n\n  private onDisconnect = (id: string, socket: SocketIO.Socket) => async () => {\n    try {\n      const { onSocketDisconnection } = this.options\n      const name = socket.nsp.name\n\n      //increment the cleanup timer\n      this.backends[name].cleanupTimer =\n        Math.floor(Date.now() / 1000) + (this.options.cleanThreshold || 30) * 60\n\n      /**\n       * wrap the automerge closeConnection call in a timeout to give any outstanding messages\n       * time to flush to the database\n       */\n      setTimeout(() => {\n        this.backends[name].automerge.closeConnection(id)\n      }, 5000)\n\n      this.backendCounts[name] = this.backendCounts[name] - 1\n      delete this.backends[name].presenceData[socket.id]\n\n      //send presence information to namespace\n      this.io\n        .of(name)\n        .compress(false)\n        .emit('msg', {\n          type: 'participant',\n          payload: Object.values(this.backends[name].presenceData)\n        })\n\n      await this.saveDocument(name)\n\n      this.garbageCursors(name)\n\n      onSocketDisconnection &&\n        (await onSocketDisconnection({\n          docId: name,\n          socket,\n          _this: this\n        }))\n    } catch (e) {\n      console.log('Error in slate-collab onDisconnect', e)\n    }\n  }\n\n  /**\n   * Clean up unused cursor data.\n   */\n\n  garbageCursors = (nsp: string) => {\n    try {\n      const doc = this.backends[nsp].automerge.getDocument(nsp)\n\n      if (!doc.cursors) return\n\n      const namespace = this.io.of(nsp)\n\n      Object.keys(doc?.cursors)?.forEach(key => {\n        if (!namespace.sockets[key]) {\n          this.backends[nsp].automerge.garbageCursor(nsp, key)\n        }\n      })\n    } catch (e) {\n      //don't necessarily care if this fails.\n    }\n  }\n\n  /**\n   * Destroy SocketIO connection\n   */\n\n  destroy = async () => {\n    this.io.close()\n  }\n}\n"]}