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request.js (26488B)
1 var AWS = require('./core');
2 var AcceptorStateMachine = require('./state_machine');
3 var inherit = AWS.util.inherit;
4 var domain = AWS.util.domain;
5 var jmespath = require('jmespath');
6
7 /**
8 * @api private
9 */
10 var hardErrorStates = {success: 1, error: 1, complete: 1};
11
12 function isTerminalState(machine) {
13 return Object.prototype.hasOwnProperty.call(hardErrorStates, machine._asm.currentState);
14 }
15
16 var fsm = new AcceptorStateMachine();
17 fsm.setupStates = function() {
18 var transition = function(_, done) {
19 var self = this;
20 self._haltHandlersOnError = false;
21
22 self.emit(self._asm.currentState, function(err) {
23 if (err) {
24 if (isTerminalState(self)) {
25 if (domain && self.domain instanceof domain.Domain) {
26 err.domainEmitter = self;
27 err.domain = self.domain;
28 err.domainThrown = false;
29 self.domain.emit('error', err);
30 } else {
31 throw err;
32 }
33 } else {
34 self.response.error = err;
35 done(err);
36 }
37 } else {
38 done(self.response.error);
39 }
40 });
41
42 };
43
44 this.addState('validate', 'build', 'error', transition);
45 this.addState('build', 'afterBuild', 'restart', transition);
46 this.addState('afterBuild', 'sign', 'restart', transition);
47 this.addState('sign', 'send', 'retry', transition);
48 this.addState('retry', 'afterRetry', 'afterRetry', transition);
49 this.addState('afterRetry', 'sign', 'error', transition);
50 this.addState('send', 'validateResponse', 'retry', transition);
51 this.addState('validateResponse', 'extractData', 'extractError', transition);
52 this.addState('extractError', 'extractData', 'retry', transition);
53 this.addState('extractData', 'success', 'retry', transition);
54 this.addState('restart', 'build', 'error', transition);
55 this.addState('success', 'complete', 'complete', transition);
56 this.addState('error', 'complete', 'complete', transition);
57 this.addState('complete', null, null, transition);
58 };
59 fsm.setupStates();
60
61 /**
62 * ## Asynchronous Requests
63 *
64 * All requests made through the SDK are asynchronous and use a
65 * callback interface. Each service method that kicks off a request
66 * returns an `AWS.Request` object that you can use to register
67 * callbacks.
68 *
69 * For example, the following service method returns the request
70 * object as "request", which can be used to register callbacks:
71 *
72 * ```javascript
73 * // request is an AWS.Request object
74 * var request = ec2.describeInstances();
75 *
76 * // register callbacks on request to retrieve response data
77 * request.on('success', function(response) {
78 * console.log(response.data);
79 * });
80 * ```
81 *
82 * When a request is ready to be sent, the {send} method should
83 * be called:
84 *
85 * ```javascript
86 * request.send();
87 * ```
88 *
89 * ## Removing Default Listeners for Events
90 *
91 * Request objects are built with default listeners for the various events,
92 * depending on the service type. In some cases, you may want to remove
93 * some built-in listeners to customize behaviour. Doing this requires
94 * access to the built-in listener functions, which are exposed through
95 * the {AWS.EventListeners.Core} namespace. For instance, you may
96 * want to customize the HTTP handler used when sending a request. In this
97 * case, you can remove the built-in listener associated with the 'send'
98 * event, the {AWS.EventListeners.Core.SEND} listener and add your own.
99 *
100 * ## Multiple Callbacks and Chaining
101 *
102 * You can register multiple callbacks on any request object. The
103 * callbacks can be registered for different events, or all for the
104 * same event. In addition, you can chain callback registration, for
105 * example:
106 *
107 * ```javascript
108 * request.
109 * on('success', function(response) {
110 * console.log("Success!");
111 * }).
112 * on('error', function(response) {
113 * console.log("Error!");
114 * }).
115 * on('complete', function(response) {
116 * console.log("Always!");
117 * }).
118 * send();
119 * ```
120 *
121 * The above example will print either "Success! Always!", or "Error! Always!",
122 * depending on whether the request succeeded or not.
123 *
124 * @!attribute httpRequest
125 * @readonly
126 * @!group HTTP Properties
127 * @return [AWS.HttpRequest] the raw HTTP request object
128 * containing request headers and body information
129 * sent by the service.
130 *
131 * @!attribute startTime
132 * @readonly
133 * @!group Operation Properties
134 * @return [Date] the time that the request started
135 *
136 * @!group Request Building Events
137 *
138 * @!event validate(request)
139 * Triggered when a request is being validated. Listeners
140 * should throw an error if the request should not be sent.
141 * @param request [Request] the request object being sent
142 * @see AWS.EventListeners.Core.VALIDATE_CREDENTIALS
143 * @see AWS.EventListeners.Core.VALIDATE_REGION
144 * @example Ensuring that a certain parameter is set before sending a request
145 * var req = s3.putObject(params);
146 * req.on('validate', function() {
147 * if (!req.params.Body.match(/^Hello\s/)) {
148 * throw new Error('Body must start with "Hello "');
149 * }
150 * });
151 * req.send(function(err, data) { ... });
152 *
153 * @!event build(request)
154 * Triggered when the request payload is being built. Listeners
155 * should fill the necessary information to send the request
156 * over HTTP.
157 * @param (see AWS.Request~validate)
158 * @example Add a custom HTTP header to a request
159 * var req = s3.putObject(params);
160 * req.on('build', function() {
161 * req.httpRequest.headers['Custom-Header'] = 'value';
162 * });
163 * req.send(function(err, data) { ... });
164 *
165 * @!event sign(request)
166 * Triggered when the request is being signed. Listeners should
167 * add the correct authentication headers and/or adjust the body,
168 * depending on the authentication mechanism being used.
169 * @param (see AWS.Request~validate)
170 *
171 * @!group Request Sending Events
172 *
173 * @!event send(response)
174 * Triggered when the request is ready to be sent. Listeners
175 * should call the underlying transport layer to initiate
176 * the sending of the request.
177 * @param response [Response] the response object
178 * @context [Request] the request object that was sent
179 * @see AWS.EventListeners.Core.SEND
180 *
181 * @!event retry(response)
182 * Triggered when a request failed and might need to be retried or redirected.
183 * If the response is retryable, the listener should set the
184 * `response.error.retryable` property to `true`, and optionally set
185 * `response.error.retryCount` to the millisecond delay for the next attempt.
186 * In the case of a redirect, `response.error.redirect` should be set to
187 * `true` with `retryCount` set to an optional delay on the next request.
188 *
189 * If a listener decides that a request should not be retried,
190 * it should set both `retryable` and `redirect` to false.
191 *
192 * Note that a retryable error will be retried at most
193 * {AWS.Config.maxRetries} times (based on the service object's config).
194 * Similarly, a request that is redirected will only redirect at most
195 * {AWS.Config.maxRedirects} times.
196 *
197 * @param (see AWS.Request~send)
198 * @context (see AWS.Request~send)
199 * @example Adding a custom retry for a 404 response
200 * request.on('retry', function(response) {
201 * // this resource is not yet available, wait 10 seconds to get it again
202 * if (response.httpResponse.statusCode === 404 && response.error) {
203 * response.error.retryable = true; // retry this error
204 * response.error.retryCount = 10000; // wait 10 seconds
205 * }
206 * });
207 *
208 * @!group Data Parsing Events
209 *
210 * @!event extractError(response)
211 * Triggered on all non-2xx requests so that listeners can extract
212 * error details from the response body. Listeners to this event
213 * should set the `response.error` property.
214 * @param (see AWS.Request~send)
215 * @context (see AWS.Request~send)
216 *
217 * @!event extractData(response)
218 * Triggered in successful requests to allow listeners to
219 * de-serialize the response body into `response.data`.
220 * @param (see AWS.Request~send)
221 * @context (see AWS.Request~send)
222 *
223 * @!group Completion Events
224 *
225 * @!event success(response)
226 * Triggered when the request completed successfully.
227 * `response.data` will contain the response data and
228 * `response.error` will be null.
229 * @param (see AWS.Request~send)
230 * @context (see AWS.Request~send)
231 *
232 * @!event error(error, response)
233 * Triggered when an error occurs at any point during the
234 * request. `response.error` will contain details about the error
235 * that occurred. `response.data` will be null.
236 * @param error [Error] the error object containing details about
237 * the error that occurred.
238 * @param (see AWS.Request~send)
239 * @context (see AWS.Request~send)
240 *
241 * @!event complete(response)
242 * Triggered whenever a request cycle completes. `response.error`
243 * should be checked, since the request may have failed.
244 * @param (see AWS.Request~send)
245 * @context (see AWS.Request~send)
246 *
247 * @!group HTTP Events
248 *
249 * @!event httpHeaders(statusCode, headers, response)
250 * Triggered when headers are sent by the remote server
251 * @param statusCode [Integer] the HTTP response code
252 * @param headers [map<String,String>] the response headers
253 * @param (see AWS.Request~send)
254 * @context (see AWS.Request~send)
255 *
256 * @!event httpData(chunk, response)
257 * Triggered when data is sent by the remote server
258 * @param chunk [Buffer] the buffer data containing the next data chunk
259 * from the server
260 * @param (see AWS.Request~send)
261 * @context (see AWS.Request~send)
262 * @see AWS.EventListeners.Core.HTTP_DATA
263 *
264 * @!event httpUploadProgress(progress, response)
265 * Triggered when the HTTP request has uploaded more data
266 * @param progress [map] An object containing the `loaded` and `total` bytes
267 * of the request.
268 * @param (see AWS.Request~send)
269 * @context (see AWS.Request~send)
270 * @note This event will not be emitted in Node.js 0.8.x.
271 *
272 * @!event httpDownloadProgress(progress, response)
273 * Triggered when the HTTP request has downloaded more data
274 * @param progress [map] An object containing the `loaded` and `total` bytes
275 * of the request.
276 * @param (see AWS.Request~send)
277 * @context (see AWS.Request~send)
278 * @note This event will not be emitted in Node.js 0.8.x.
279 *
280 * @!event httpError(error, response)
281 * Triggered when the HTTP request failed
282 * @param error [Error] the error object that was thrown
283 * @param (see AWS.Request~send)
284 * @context (see AWS.Request~send)
285 *
286 * @!event httpDone(response)
287 * Triggered when the server is finished sending data
288 * @param (see AWS.Request~send)
289 * @context (see AWS.Request~send)
290 *
291 * @see AWS.Response
292 */
293 AWS.Request = inherit({
294
295 /**
296 * Creates a request for an operation on a given service with
297 * a set of input parameters.
298 *
299 * @param service [AWS.Service] the service to perform the operation on
300 * @param operation [String] the operation to perform on the service
301 * @param params [Object] parameters to send to the operation.
302 * See the operation's documentation for the format of the
303 * parameters.
304 */
305 constructor: function Request(service, operation, params) {
306 var endpoint = service.endpoint;
307 var region = service.config.region;
308 var customUserAgent = service.config.customUserAgent;
309
310 // global endpoints sign as us-east-1
311 if (service.isGlobalEndpoint) region = 'us-east-1';
312
313 this.domain = domain && domain.active;
314 this.service = service;
315 this.operation = operation;
316 this.params = params || {};
317 this.httpRequest = new AWS.HttpRequest(endpoint, region, customUserAgent);
318 this.startTime = AWS.util.date.getDate();
319
320 this.response = new AWS.Response(this);
321 this._asm = new AcceptorStateMachine(fsm.states, 'validate');
322 this._haltHandlersOnError = false;
323
324 AWS.SequentialExecutor.call(this);
325 this.emit = this.emitEvent;
326 },
327
328 /**
329 * @!group Sending a Request
330 */
331
332 /**
333 * @overload send(callback = null)
334 * Sends the request object.
335 *
336 * @callback callback function(err, data)
337 * If a callback is supplied, it is called when a response is returned
338 * from the service.
339 * @context [AWS.Request] the request object being sent.
340 * @param err [Error] the error object returned from the request.
341 * Set to `null` if the request is successful.
342 * @param data [Object] the de-serialized data returned from
343 * the request. Set to `null` if a request error occurs.
344 * @example Sending a request with a callback
345 * request = s3.putObject({Bucket: 'bucket', Key: 'key'});
346 * request.send(function(err, data) { console.log(err, data); });
347 * @example Sending a request with no callback (using event handlers)
348 * request = s3.putObject({Bucket: 'bucket', Key: 'key'});
349 * request.on('complete', function(response) { ... }); // register a callback
350 * request.send();
351 */
352 send: function send(callback) {
353 if (callback) {
354 this.on('complete', function (resp) {
355 callback.call(resp, resp.error, resp.data);
356 });
357 }
358 this.runTo();
359
360 return this.response;
361 },
362
363 /**
364 * @!method promise()
365 * Returns a 'thenable' promise.
366 *
367 * Two callbacks can be provided to the `then` method on the returned promise.
368 * The first callback will be called if the promise is fulfilled, and the second
369 * callback will be called if the promise is rejected.
370 * @callback fulfilledCallback function(data)
371 * Called if the promise is fulfilled.
372 * @param data [Object] the de-serialized data returned from the request.
373 * @callback rejectedCallback function(error)
374 * Called if the promise is rejected.
375 * @param error [Error] the error object returned from the request.
376 * @return [Promise] A promise that represents the state of the request.
377 * @example Sending a request using promises.
378 * var request = s3.putObject({Bucket: 'bucket', Key: 'key'});
379 * var result = request.promise();
380 * result.then(function(data) { ... }, function(error) { ... });
381 */
382
383 /**
384 * @api private
385 */
386 build: function build(callback) {
387 return this.runTo('send', callback);
388 },
389
390 /**
391 * @api private
392 */
393 runTo: function runTo(state, done) {
394 this._asm.runTo(state, done, this);
395 return this;
396 },
397
398 /**
399 * Aborts a request, emitting the error and complete events.
400 *
401 * @!macro nobrowser
402 * @example Aborting a request after sending
403 * var params = {
404 * Bucket: 'bucket', Key: 'key',
405 * Body: new Buffer(1024 * 1024 * 5) // 5MB payload
406 * };
407 * var request = s3.putObject(params);
408 * request.send(function (err, data) {
409 * if (err) console.log("Error:", err.code, err.message);
410 * else console.log(data);
411 * });
412 *
413 * // abort request in 1 second
414 * setTimeout(request.abort.bind(request), 1000);
415 *
416 * // prints "Error: RequestAbortedError Request aborted by user"
417 * @return [AWS.Request] the same request object, for chaining.
418 * @since v1.4.0
419 */
420 abort: function abort() {
421 this.removeAllListeners('validateResponse');
422 this.removeAllListeners('extractError');
423 this.on('validateResponse', function addAbortedError(resp) {
424 resp.error = AWS.util.error(new Error('Request aborted by user'), {
425 code: 'RequestAbortedError', retryable: false
426 });
427 });
428
429 if (this.httpRequest.stream) { // abort HTTP stream
430 this.httpRequest.stream.abort();
431 if (this.httpRequest._abortCallback) {
432 this.httpRequest._abortCallback();
433 } else {
434 this.removeAllListeners('send'); // haven't sent yet, so let's not
435 }
436 }
437
438 return this;
439 },
440
441 /**
442 * Iterates over each page of results given a pageable request, calling
443 * the provided callback with each page of data. After all pages have been
444 * retrieved, the callback is called with `null` data.
445 *
446 * @note This operation can generate multiple requests to a service.
447 * @example Iterating over multiple pages of objects in an S3 bucket
448 * var pages = 1;
449 * s3.listObjects().eachPage(function(err, data) {
450 * if (err) return;
451 * console.log("Page", pages++);
452 * console.log(data);
453 * });
454 * @example Iterating over multiple pages with an asynchronous callback
455 * s3.listObjects(params).eachPage(function(err, data, done) {
456 * doSomethingAsyncAndOrExpensive(function() {
457 * // The next page of results isn't fetched until done is called
458 * done();
459 * });
460 * });
461 * @callback callback function(err, data, [doneCallback])
462 * Called with each page of resulting data from the request. If the
463 * optional `doneCallback` is provided in the function, it must be called
464 * when the callback is complete.
465 *
466 * @param err [Error] an error object, if an error occurred.
467 * @param data [Object] a single page of response data. If there is no
468 * more data, this object will be `null`.
469 * @param doneCallback [Function] an optional done callback. If this
470 * argument is defined in the function declaration, it should be called
471 * when the next page is ready to be retrieved. This is useful for
472 * controlling serial pagination across asynchronous operations.
473 * @return [Boolean] if the callback returns `false`, pagination will
474 * stop.
475 *
476 * @see AWS.Request.eachItem
477 * @see AWS.Response.nextPage
478 * @since v1.4.0
479 */
480 eachPage: function eachPage(callback) {
481 // Make all callbacks async-ish
482 callback = AWS.util.fn.makeAsync(callback, 3);
483
484 function wrappedCallback(response) {
485 callback.call(response, response.error, response.data, function (result) {
486 if (result === false) return;
487
488 if (response.hasNextPage()) {
489 response.nextPage().on('complete', wrappedCallback).send();
490 } else {
491 callback.call(response, null, null, AWS.util.fn.noop);
492 }
493 });
494 }
495
496 this.on('complete', wrappedCallback).send();
497 },
498
499 /**
500 * Enumerates over individual items of a request, paging the responses if
501 * necessary.
502 *
503 * @api experimental
504 * @since v1.4.0
505 */
506 eachItem: function eachItem(callback) {
507 var self = this;
508 function wrappedCallback(err, data) {
509 if (err) return callback(err, null);
510 if (data === null) return callback(null, null);
511
512 var config = self.service.paginationConfig(self.operation);
513 var resultKey = config.resultKey;
514 if (Array.isArray(resultKey)) resultKey = resultKey[0];
515 var items = jmespath.search(data, resultKey);
516 var continueIteration = true;
517 AWS.util.arrayEach(items, function(item) {
518 continueIteration = callback(null, item);
519 if (continueIteration === false) {
520 return AWS.util.abort;
521 }
522 });
523 return continueIteration;
524 }
525
526 this.eachPage(wrappedCallback);
527 },
528
529 /**
530 * @return [Boolean] whether the operation can return multiple pages of
531 * response data.
532 * @see AWS.Response.eachPage
533 * @since v1.4.0
534 */
535 isPageable: function isPageable() {
536 return this.service.paginationConfig(this.operation) ? true : false;
537 },
538
539 /**
540 * Converts the request object into a readable stream that
541 * can be read from or piped into a writable stream.
542 *
543 * @note The data read from a readable stream contains only
544 * the raw HTTP body contents.
545 * @example Manually reading from a stream
546 * request.createReadStream().on('data', function(data) {
547 * console.log("Got data:", data.toString());
548 * });
549 * @example Piping a request body into a file
550 * var out = fs.createWriteStream('/path/to/outfile.jpg');
551 * s3.service.getObject(params).createReadStream().pipe(out);
552 * @return [Stream] the readable stream object that can be piped
553 * or read from (by registering 'data' event listeners).
554 * @!macro nobrowser
555 */
556 createReadStream: function createReadStream() {
557 var streams = AWS.util.stream;
558 var req = this;
559 var stream = null;
560
561 if (AWS.HttpClient.streamsApiVersion === 2) {
562 stream = new streams.PassThrough();
563 req.send();
564 } else {
565 stream = new streams.Stream();
566 stream.readable = true;
567
568 stream.sent = false;
569 stream.on('newListener', function(event) {
570 if (!stream.sent && event === 'data') {
571 stream.sent = true;
572 process.nextTick(function() { req.send(); });
573 }
574 });
575 }
576
577 this.on('httpHeaders', function streamHeaders(statusCode, headers, resp) {
578 if (statusCode < 300) {
579 req.removeListener('httpData', AWS.EventListeners.Core.HTTP_DATA);
580 req.removeListener('httpError', AWS.EventListeners.Core.HTTP_ERROR);
581 req.on('httpError', function streamHttpError(error) {
582 resp.error = error;
583 resp.error.retryable = false;
584 });
585
586 var shouldCheckContentLength = false;
587 var expectedLen;
588 if (req.httpRequest.method !== 'HEAD') {
589 expectedLen = parseInt(headers['content-length'], 10);
590 }
591 if (expectedLen !== undefined && !isNaN(expectedLen) && expectedLen >= 0) {
592 shouldCheckContentLength = true;
593 var receivedLen = 0;
594 }
595
596 var checkContentLengthAndEmit = function checkContentLengthAndEmit() {
597 if (shouldCheckContentLength && receivedLen !== expectedLen) {
598 stream.emit('error', AWS.util.error(
599 new Error('Stream content length mismatch. Received ' +
600 receivedLen + ' of ' + expectedLen + ' bytes.'),
601 { code: 'StreamContentLengthMismatch' }
602 ));
603 } else if (AWS.HttpClient.streamsApiVersion === 2) {
604 stream.end();
605 } else {
606 stream.emit('end')
607 }
608 }
609
610 var httpStream = resp.httpResponse.createUnbufferedStream();
611
612 if (AWS.HttpClient.streamsApiVersion === 2) {
613 if (shouldCheckContentLength) {
614 var lengthAccumulator = new streams.PassThrough();
615 lengthAccumulator._write = function(chunk) {
616 if (chunk && chunk.length) {
617 receivedLen += chunk.length;
618 }
619 return streams.PassThrough.prototype._write.apply(this, arguments);
620 };
621
622 lengthAccumulator.on('end', checkContentLengthAndEmit);
623 httpStream.pipe(lengthAccumulator).pipe(stream, { end: false });
624 } else {
625 httpStream.pipe(stream);
626 }
627 } else {
628
629 if (shouldCheckContentLength) {
630 httpStream.on('data', function(arg) {
631 if (arg && arg.length) {
632 receivedLen += arg.length;
633 }
634 });
635 }
636
637 httpStream.on('data', function(arg) {
638 stream.emit('data', arg);
639 });
640 httpStream.on('end', checkContentLengthAndEmit);
641 }
642
643 httpStream.on('error', function(err) {
644 shouldCheckContentLength = false;
645 stream.emit('error', err);
646 });
647 }
648 });
649
650 this.on('error', function(err) {
651 stream.emit('error', err);
652 });
653
654 return stream;
655 },
656
657 /**
658 * @param [Array,Response] args This should be the response object,
659 * or an array of args to send to the event.
660 * @api private
661 */
662 emitEvent: function emit(eventName, args, done) {
663 if (typeof args === 'function') { done = args; args = null; }
664 if (!done) done = function() { };
665 if (!args) args = this.eventParameters(eventName, this.response);
666
667 var origEmit = AWS.SequentialExecutor.prototype.emit;
668 origEmit.call(this, eventName, args, function (err) {
669 if (err) this.response.error = err;
670 done.call(this, err);
671 });
672 },
673
674 /**
675 * @api private
676 */
677 eventParameters: function eventParameters(eventName) {
678 switch (eventName) {
679 case 'restart':
680 case 'validate':
681 case 'sign':
682 case 'build':
683 case 'afterValidate':
684 case 'afterBuild':
685 return [this];
686 case 'error':
687 return [this.response.error, this.response];
688 default:
689 return [this.response];
690 }
691 },
692
693 /**
694 * @api private
695 */
696 presign: function presign(expires, callback) {
697 if (!callback && typeof expires === 'function') {
698 callback = expires;
699 expires = null;
700 }
701 return new AWS.Signers.Presign().sign(this.toGet(), expires, callback);
702 },
703
704 /**
705 * @api private
706 */
707 isPresigned: function isPresigned() {
708 return Object.prototype.hasOwnProperty.call(this.httpRequest.headers, 'presigned-expires');
709 },
710
711 /**
712 * @api private
713 */
714 toUnauthenticated: function toUnauthenticated() {
715 this.removeListener('validate', AWS.EventListeners.Core.VALIDATE_CREDENTIALS);
716 this.removeListener('sign', AWS.EventListeners.Core.SIGN);
717 return this;
718 },
719
720 /**
721 * @api private
722 */
723 toGet: function toGet() {
724 if (this.service.api.protocol === 'query' ||
725 this.service.api.protocol === 'ec2') {
726 this.removeListener('build', this.buildAsGet);
727 this.addListener('build', this.buildAsGet);
728 }
729 return this;
730 },
731
732 /**
733 * @api private
734 */
735 buildAsGet: function buildAsGet(request) {
736 request.httpRequest.method = 'GET';
737 request.httpRequest.path = request.service.endpoint.path +
738 '?' + request.httpRequest.body;
739 request.httpRequest.body = '';
740
741 // don't need these headers on a GET request
742 delete request.httpRequest.headers['Content-Length'];
743 delete request.httpRequest.headers['Content-Type'];
744 },
745
746 /**
747 * @api private
748 */
749 haltHandlersOnError: function haltHandlersOnError() {
750 this._haltHandlersOnError = true;
751 }
752 });
753
754 /**
755 * @api private
756 */
757 AWS.Request.addPromisesToClass = function addPromisesToClass(PromiseDependency) {
758 this.prototype.promise = function promise() {
759 var self = this;
760 return new PromiseDependency(function(resolve, reject) {
761 self.on('complete', function(resp) {
762 if (resp.error) {
763 reject(resp.error);
764 } else {
765 resolve(resp.data);
766 }
767 });
768 self.runTo();
769 });
770 };
771 };
772
773 /**
774 * @api private
775 */
776 AWS.Request.deletePromisesFromClass = function deletePromisesFromClass() {
777 delete this.prototype.promise;
778 };
779
780 AWS.util.addPromises(AWS.Request);
781
782 AWS.util.mixin(AWS.Request, AWS.SequentialExecutor);