Hi Stuart,
Yes apologies if I wasn't clear.
On the app engine side of things I'm calling createUploadURL and placing
the resulting url in the task payload as follows:
BlobstoreService blobstoreService =
BlobstoreServiceFactory.getBlobstoreService();
String uploadURL = blobstoreService.createUploadUrl("/"+url);
task.payload(uploadURL);
Alternatively, would anyone know of sample code in java trying to
programmatically upload blobs from an external app (posting a response to a
pull task queue) might make things easier. I'm surprise I couldn't find
anything like that on the web.
In a nutshell all I'm trying to do is reproduce the architecture of the
first pull task system presented in the Google I/O talk
http://youtu.be/AM0ZPO7-lcE in java, to place a response to the pull task
queue for the app engine app to consume.
Thanks for your help :-)
On Thursday, 8 March 2012 22:13:45 UTC, Stuart Langley wrote:
>
> Is that the actual code?
>
> You need to call createUploadURL for each blob you want to upload.
>
> On Friday, 9 March 2012 00:03:43 UTC+11, Killian wrote:
>>
>> Hi Lads,
>>
>> This issue has been bugging me for a while now and just wasted the last 2
>> days with no solution found. I'm getting desperate at this stage !
>>
>> My aim was to use the Task Queue Pull service to run some NLP processing
>> outside of app engine on an external VM. That's working fine however all
>> the trouble started when I discovered that the output produced by the
>> external VM could be fed back into the Task Queue. Following the example in
>> the Google I/O video http://youtu.be/AM0ZPO7-lcE , I then decided to
>> provide the response of the task queue as a Blob upload to the app engine.
>> So I have the working example
>> http://code.google.com/appengine/docs/java/blobstore/overview.htmlimplement
>> and working perfectly. (ie: I can manually upload a file using
>> the jsp form and store it).
>>
>> The problem is that for obvious reasons I need to send this post request
>> from the VM programmatically. And that's were things start getting messy.
>> Since the video only provides an example in Python and not in java I've
>> been struggling find a solution to this.
>>
>> Looking around it seems like I need the httpcomponents-client-4.1.3
>> apache library to create post requests.
>> So this is the workflow I have:
>> I generate the upload url from the app engine side and place it in the
>> task queue payload which is then retrieved by the VM correctly.
>>
>> on the VM side this is what I do:
>>
>> String uploadURL =
>> "http://<host>/_ah/upload/agtsaW5ndWFib3gxMHIbCxIVX19CbG9iVXBsb2FkU2Vzc2lvbl9fGAEM"
>> ;
>>
>> DefaultHttpClient httpclient = new DefaultHttpClient();
>>
>> HttpPost method = new HttpPost(uploadURL);
>>
>> MultipartEntity entity = new MultipartEntity();
>>
>> File f = new File("dummyFileToUpload.txt");
>>
>> FileBody fileBody = new FileBody(f);
>>
>> entity.addPart("myFile", fileBody);
>>
>> method.setEntity(entity);
>>
>> HttpResponse response = httpclient.execute(method);
>>
>> System.out.println(response.getStatusLine());
>>
>> PROBLEM:
>>
>> When I do this both in development mode or production mode, I receive a
>> "http 404 not found" response. and it seems like the upload servlet isn't
>> run at all (if I'm in deug mode for instance). However when I look in the
>> blob store, the blob was indeed uploaded correctly which is good news of
>> course however it means I can't get a proper response from the app engine
>> side and more importantly can't run anything in the upload servlet.
>>
>> I'm guessing my post request mustn't be created properly which would
>> explain why the app engine side is reacting weird? Is there anything
>> obviously wrong in my approach?
>>
>> Would really appreciate any advice on this.
>>
>> Thanks in advance :-)
>>
>>
>>
>>
>>
>>
>>
>
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