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events: Don't crash on events named __proto__ 

This prefixes all event names internally with 'ev'.
v0.9.7-release
isaacs 12 years ago
parent
562d3f11f3
commit
b48e303af0
4 changed files with 86 additions and 44 deletions
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  1. 67
      lib/events.js
  2. 14
      test/simple/test-event-emitter-check-listener-leaks.js
  3. 12
      test/simple/test-event-emitter-listeners-side-effects.js
  4. 37
      test/simple/test-event-emitter-prototype-property.js

67
lib/events.js
View File

@ -53,8 +53,8 @@ var PROCESS;
EventEmitter.prototype.emit = function(type) {
// If there is no 'error' event listener then throw.
if (type === 'error') {
if (!this._events || !this._events.error ||
(isArray(this._events.error) && !this._events.error.length))
if (!this._events || !this._events.everror ||
(isArray(this._events.everror) && !this._events.everror.length))
{
if (this.domain) {
var er = arguments[1];
@ -75,7 +75,8 @@ EventEmitter.prototype.emit = function(type) {
}
if (!this._events) return false;
var handler = this._events[type];
var evtype = 'ev' + type;
var handler = this._events[evtype];
if (!handler) return false;
if (typeof handler == 'function') {
@ -142,36 +143,37 @@ EventEmitter.prototype.addListener = function(type, listener) {
// To avoid recursion in the case that type == "newListener"! Before
// adding it to the listeners, first emit "newListener".
if (this._events.newListener) {
if (this._events.evnewListener) {
this.emit('newListener', type, typeof listener.listener === 'function' ?
listener.listener : listener);
}
if (!this._events[type]) {
var evtype = 'ev' + type;
if (!this._events[evtype]) {
// Optimize the case of one listener. Don't need the extra array object.
this._events[type] = listener;
} else if (isArray(this._events[type])) {
this._events[evtype] = listener;
} else if (isArray(this._events[evtype])) {
// If we've already got an array, just append.
this._events[type].push(listener);
this._events[evtype].push(listener);
} else {
// Adding the second element, need to change to array.
this._events[type] = [this._events[type], listener];
this._events[evtype] = [this._events[evtype], listener];
}
// Check for listener leak
if (isArray(this._events[type]) && !this._events[type].warned) {
if (isArray(this._events[evtype]) && !this._events[evtype].warned) {
var m;
m = this._maxListeners;
if (m && m > 0 && this._events[type].length > m) {
this._events[type].warned = true;
if (m && m > 0 && this._events[evtype].length > m) {
this._events[evtype].warned = true;
console.error('(node) warning: possible EventEmitter memory ' +
'leak detected. %d listeners added. ' +
'Use emitter.setMaxListeners() to increase limit.',
this._events[type].length);
this._events[evtype].length);
console.trace();
}
}
@ -204,10 +206,11 @@ EventEmitter.prototype.removeListener = function(type, listener) {
throw new Error('removeListener only takes instances of Function');
}
// does not use listeners(), so no side effect of creating _events[type]
if (!this._events || !this._events[type]) return this;
var evtype = 'ev' + type;
// does not use listeners(), so no side effect of creating _events[evtype]
if (!this._events || !this._events[evtype]) return this;
var list = this._events[type];
var list = this._events[evtype];
if (isArray(list)) {
var position = -1;
@ -223,17 +226,17 @@ EventEmitter.prototype.removeListener = function(type, listener) {
if (position < 0) return this;
list.splice(position, 1);
if (list.length == 0)
this._events[type] = null;
this._events[evtype] = null;
if (this._events.removeListener) {
if (this._events.evremoveListener) {
this.emit('removeListener', type, listener);
}
} else if (list === listener ||
(list.listener && list.listener === listener))
{
this._events[type] = null;
this._events[evtype] = null;
if (this._events.removeListener) {
if (this._events.evremoveListener) {
this.emit('removeListener', type, listener);
}
}
@ -245,11 +248,11 @@ EventEmitter.prototype.removeAllListeners = function(type) {
if (!this._events) return this;
// fast path
if (!this._events.removeListener) {
if (!this._events.evremoveListener) {
if (arguments.length === 0) {
this._events = {};
} else if (type && this._events && this._events[type]) {
this._events[type] = null;
} else if (type && this._events && this._events['ev' + type]) {
this._events['ev' + type] = null;
}
return this;
}
@ -257,15 +260,16 @@ EventEmitter.prototype.removeAllListeners = function(type) {
// slow(ish) path, emit 'removeListener' events for all removals
if (arguments.length === 0) {
for (var key in this._events) {
if (key === 'removeListener') continue;
this.removeAllListeners(key);
if (key === 'evremoveListener') continue;
this.removeAllListeners(key.slice(2));
}
this.removeAllListeners('removeListener');
this._events = {};
return this;
}
var listeners = this._events[type];
var evtype = 'ev' + type;
var listeners = this._events[evtype];
if (isArray(listeners)) {
while (listeners.length) {
// LIFO order
@ -274,15 +278,16 @@ EventEmitter.prototype.removeAllListeners = function(type) {
} else if (listeners) {
this.removeListener(type, listeners);
}
this._events[type] = null;
this._events[evtype] = null;
return this;
};
EventEmitter.prototype.listeners = function(type) {
if (!this._events || !this._events[type]) return [];
if (!isArray(this._events[type])) {
return [this._events[type]];
var evtype = 'ev' + type;
if (!this._events || !this._events[evtype]) return [];
if (!isArray(this._events[evtype])) {
return [this._events[evtype]];
}
return this._events[type].slice(0);
return this._events[evtype].slice(0);
};

14
test/simple/test-event-emitter-check-listener-leaks.js
View File

@ -29,30 +29,30 @@ var e = new events.EventEmitter();
for (var i = 0; i < 10; i++) {
e.on('default', function() {});
}
assert.ok(!e._events['default'].hasOwnProperty('warned'));
assert.ok(!e._events.evdefault.hasOwnProperty('warned'));
e.on('default', function() {});
assert.ok(e._events['default'].warned);
assert.ok(e._events.evdefault.warned);
// specific
e.setMaxListeners(5);
for (var i = 0; i < 5; i++) {
e.on('specific', function() {});
}
assert.ok(!e._events['specific'].hasOwnProperty('warned'));
assert.ok(!e._events.evspecific.hasOwnProperty('warned'));
e.on('specific', function() {});
assert.ok(e._events['specific'].warned);
assert.ok(e._events.evspecific.warned);
// only one
e.setMaxListeners(1);
e.on('only one', function() {});
assert.ok(!e._events['only one'].hasOwnProperty('warned'));
assert.ok(!e._events['evonly one'].hasOwnProperty('warned'));
e.on('only one', function() {});
assert.ok(e._events['only one'].hasOwnProperty('warned'));
assert.ok(e._events['evonly one'].hasOwnProperty('warned'));
// unlimited
e.setMaxListeners(0);
for (var i = 0; i < 1000; i++) {
e.on('unlimited', function() {});
}
assert.ok(!e._events['unlimited'].hasOwnProperty('warned'));
assert.ok(!e._events['evunlimited'].hasOwnProperty('warned'));

12
test/simple/test-event-emitter-listeners-side-effects.js
View File

@ -37,21 +37,21 @@ assert.equal(e._events, null);
e.on('foo', assert.fail);
fl = e.listeners('foo');
assert(e._events.foo === assert.fail);
assert(e._events.evfoo === assert.fail);
assert(Array.isArray(fl));
assert(fl.length === 1);
assert(fl[0] === assert.fail);
e.listeners('bar');
assert(!e._events.hasOwnProperty('bar'));
assert(!e._events.hasOwnProperty('evbar'));
e.on('foo', assert.ok);
fl = e.listeners('foo');
assert(Array.isArray(e._events.foo));
assert(e._events.foo.length === 2);
assert(e._events.foo[0] === assert.fail);
assert(e._events.foo[1] === assert.ok);
assert(Array.isArray(e._events.evfoo));
assert(e._events.evfoo.length === 2);
assert(e._events.evfoo[0] === assert.fail);
assert(e._events.evfoo[1] === assert.ok);
assert(Array.isArray(fl));
assert(fl.length === 2);

37
test/simple/test-event-emitter-prototype-property.js
View File

@ -0,0 +1,37 @@
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var common = require('../common');
var assert = require('assert');
var events = require('events');
var e = new events.EventEmitter();
var emited = false;
e.on('__proto__', function() {
emited = true;
});
e.emit('__proto__');
process.on('exit', function() {
assert.equal(true, emited);
});
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