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'use strict';
var EventEmitter = require('events').EventEmitter;
var TextOperation = require('./text-operation');
var WrappedOperation = require('./wrapped-operation');
var Server = require('./server');
var Selection = require('./selection');
var util = require('util');
var LZString = require('lz-string');
var logger = require('../logger');
function EditorSocketIOServer(document, operations, docId, mayWrite) {
EventEmitter.call(this);
Server.call(this, document, operations);
this.users = {};
this.docId = docId;
this.mayWrite = mayWrite || function (_, cb) {
cb(true);
};
}
util.inherits(EditorSocketIOServer, Server);
extend(EditorSocketIOServer.prototype, EventEmitter.prototype);
function extend(target, source) {
for (var key in source) {
if (source.hasOwnProperty(key)) {
target[key] = source[key];
}
}
}
EditorSocketIOServer.prototype.addClient = function (socket) {
var self = this;
socket.join(this.docId);
var docOut = {
str: this.document,
revision: this.operations.length,
clients: this.users
};
socket.emit('doc', LZString.compressToUTF16(JSON.stringify(docOut)));
socket.on('operation', function (revision, operation, selection) {
operation = LZString.decompressFromUTF16(operation);
operation = JSON.parse(operation);
socket.origin = 'operation';
self.mayWrite(socket, function (mayWrite) {
if (!mayWrite) {
console.log("User doesn't have the right to edit.");
return;
}
try {
self.onOperation(socket, revision, operation, selection);
} catch (err) {
socket.disconnect(true);
}
});
});
socket.on('get_operations', function (base, head) {
self.onGetOperations(socket, base, head);
});
socket.on('selection', function (obj) {
socket.origin = 'selection';
self.mayWrite(socket, function (mayWrite) {
if (!mayWrite) {
console.log("User doesn't have the right to edit.");
return;
}
self.updateSelection(socket, obj && Selection.fromJSON(obj));
});
});
socket.on('disconnect', function () {
//console.log("Disconnect");
socket.leave(self.docId);
self.onDisconnect(socket);
/*
if (socket.manager && socket.manager.sockets.clients(self.docId).length === 0) {
self.emit('empty-room');
}
*/
});
};
EditorSocketIOServer.prototype.onOperation = function (socket, revision, operation, selection) {
var wrapped;
try {
wrapped = new WrappedOperation(
TextOperation.fromJSON(operation),
selection && Selection.fromJSON(selection)
);
} catch (exc) {
logger.error("Invalid operation received: ");
logger.error(exc);
throw new Error(exc);
}
try {
var clientId = socket.id;
var wrappedPrime = this.receiveOperation(revision, wrapped);
if(!wrappedPrime) return;
//console.log("new operation: " + JSON.stringify(wrapped));
this.getClient(clientId).selection = wrappedPrime.meta;
revision = this.operations.length;
socket.emit('ack', revision);
socket.broadcast.in(this.docId).emit(
'operation', clientId, revision,
wrappedPrime.wrapped.toJSON(), wrappedPrime.meta
);
//set document is dirty
this.isDirty = true;
} catch (exc) {
logger.error(exc);
throw new Error(exc);
}
};
EditorSocketIOServer.prototype.onGetOperations = function (socket, base, head) {
var operations = this.operations.slice(base, head).map(function (op) {
return op.wrapped.toJSON();
});
operations = LZString.compressToUTF16(JSON.stringify(operations));
socket.emit('operations', head, operations);
};
EditorSocketIOServer.prototype.updateSelection = function (socket, selection) {
var clientId = socket.id;
if (selection) {
this.getClient(clientId).selection = selection;
} else {
delete this.getClient(clientId).selection;
}
socket.broadcast.to(this.docId).emit('selection', clientId, selection);
};
EditorSocketIOServer.prototype.setName = function (socket, name) {
var clientId = socket.id;
this.getClient(clientId).name = name;
socket.broadcast.to(this.docId).emit('set_name', clientId, name);
};
EditorSocketIOServer.prototype.setColor = function (socket, color) {
var clientId = socket.id;
this.getClient(clientId).color = color;
socket.broadcast.to(this.docId).emit('set_color', clientId, color);
};
EditorSocketIOServer.prototype.getClient = function (clientId) {
return this.users[clientId] || (this.users[clientId] = {});
};
EditorSocketIOServer.prototype.onDisconnect = function (socket) {
var clientId = socket.id;
delete this.users[clientId];
socket.broadcast.to(this.docId).emit('client_left', clientId);
};
module.exports = EditorSocketIOServer;
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