Alamofire 3.5.1 crashed when cancel the upload request - alamofire

Question

I just followed cnoon's suggest for the request cancel, the steps like:
post the multipartFormData upload request;
catch the upload progress and get the Alamofire.Request in the encodingCompletion;
do cancel request;
Then the crash is coming.
All of the upload related code as below:
private var request: Alamofire.Request?
func upload() {
Alamofire.upload(
.POST,
"\(AppManager_Inst.currentServerAddress)/cloud/uploadFile",
multipartFormData: { [unowned self] multipartFormData in
if self.uploadFile.data.isKindOfClass(UIImage),
let image = self.uploadFile.data as? UIImage,
let imageData = UIImagePNGRepresentation(image) {
multipartFormData.appendBodyPart(data: imageData, name: "file", fileName: "\(self.uploadFile.name).png", mimeType: "image/png")
}
for (key, value) in parameters {
multipartFormData.appendBodyPart(data: value.dataUsingEncoding(NSUTF8StringEncoding)!, name: key)
}
}, encodingCompletion: { [unowned self] encodingResult in
switch encodingResult {
case .Success(let upload, _, _):
self.request = upload
upload.progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
dispatch_async(dispatch_get_main_queue()) {
let buffer = ["file": "\(self.uploadFile.id)", "speed": "\(bytesRead)", "readed": "\(totalBytesRead)", "all": "\(totalBytesExpectedToRead)"]
GlobalBroadcast_Inst.broadcastMsg(.uploading, msg: buffer)
}
}
upload.responseData(completionHandler: { (response) in
self.uploading = false
let resp = NewFileResp.parseFromData(response.data!)
})
case .Failure(let error):
self.uploading = false
print(error)
}
}
)
}
request?.cancel()
The crash info as below:
*** Terminating app due to uncaught exception 'UninitializedMessage', reason: ''
*** First throw call stack:
(
0 CoreFoundation 0x000000010ceb2d85 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010f322deb objc_exception_throw + 48
2 ProtocolBuffers 0x000000010bb72b69 -[PBGeneratedMessageBuilder checkInitialized] + 169
3 CommonFoundation 0x000000010bd1a17b -[NewFileRespBuilder build] + 43
4 CommonFoundation 0x000000010bd18942 +[NewFileResp parseFromData:] + 130
5 QBCloud 0x000000010b690fe0 _TFFFC7QBCloud8Uploader6uploadFT_T_U0_FOC9Alamofire7Manager31MultipartFormDataEncodingResultT_U0_FGVS1_8ResponseCSo6NSDataCSo7NSError_T_ + 448
6 Alamofire 0x000000010b92c0d7 _TTRXFo_oGV9Alamofire8ResponseCSo6NSDataCSo7NSError__dT__XFo_iGS0_S1_S2___dT__ + 151
7 Alamofire 0x000000010b92bc4d _TFFFC9Alamofire7Request8responseuRxS_22ResponseSerializerTyperFT5queueGSqPSo17OS_dispatch_queue__18responseSerializerx17completionHandlerFGVS_8Responsewx16SerializedObjectwx11ErrorObject_T__DS0_U_FT_T_U_FT_T_ + 797
8 Alamofire 0x000000010b92a494 _TPA__TFFFC9Alamofire7Request8responseuRxS_22ResponseSerializerTyperFT5queueGSqPSo17OS_dispatch_queue__18responseSerializerx17completionHandlerFGVS_8Responsewx16SerializedObjectwx11ErrorObject_T__DS0_U_FT_T_U_FT_T_ + 164
9 Alamofire 0x000000010b8e3bf7 _TTRXFo__dT__XFdCb__dT__ + 39
10 libdispatch.dylib 0x0000000110578d9d _dispatch_call_block_and_release + 12
11 libdispatch.dylib 0x00000001105993eb _dispatch_client_callout + 8
12 libdispatch.dylib 0x00000001105811ef _dispatch_main_queue_callback_4CF + 1738
13 CoreFoundation 0x000000010ce0c0f9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
14 CoreFoundation 0x000000010cdcdb99 __CFRunLoopRun + 2073
15 CoreFoundation 0x000000010cdcd0f8 CFRunLoopRunSpecific + 488
16 GraphicsServices 0x0000000113cd3ad2 GSEventRunModal + 161
17 UIKit 0x000000010dda5f09 UIApplicationMain + 171
18 QBCloud 0x000000010b692b42 main + 114
19 libdyld.dylib 0x00000001105ce92d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type
Does anyone can help on this?

Answer 1

I find the root cause of my problem is the response.data is 0 bytes NSData, so the parseFromData of protobuf failed:
upload.responseData(completionHandler: { (response) in
self.uploading = false
let resp = NewFileResp.parseFromData(response.data!)
})