summaryrefslogtreecommitdiff
path: root/lib/ot/editor-socketio-server.js
blob: 5014ac8d2637ea9b125078f67cf7db72c8de13c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
'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 logger = require('../logger');

function EditorSocketIOServer(document, operations, docId, mayWrite, operationCallback) {
    EventEmitter.call(this);
    Server.call(this, document, operations);
    this.users = {};
    this.docId = docId;
    this.mayWrite = mayWrite || function (_, cb) {
        cb(true);
    };
    this.operationCallback = operationCallback;
}

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', docOut);
    socket.on('operation', function (revision, operation, selection) {
        socket.origin = 'operation';
        self.mayWrite(socket, function (mayWrite) {
            if (!mayWrite) {
                logger.info("User doesn't have the right to edit.");
                return;
            }
            try {
                self.onOperation(socket, revision, operation, selection);
                if (typeof self.operationCallback === 'function')
                    self.operationCallback(socket, operation);
            } catch (err) {
                setTimeout(function() {
                    var docOut = {
                        str: self.document,
                        revision: self.operations.length,
                        clients: self.users,
                        force: true
                    };
                    socket.emit('doc', docOut);
                }, 100);
            }
        });
    });
    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) {
                logger.info("User doesn't have the right to edit.");
                return;
            }
            self.updateSelection(socket, obj && Selection.fromJSON(obj));
        });
    });
    socket.on('disconnect', function () {
        logger.debug("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;
        logger.debug("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();
    });
    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;