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January 2, 2016 16:19
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Use celery to refactor a time consuming view.
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| def export(request, **kwargs): | |
| qs = get_queryset(**kwargs) | |
| response = HttpResponse(mimetype='text/csv') | |
| response['Content-Disposition'] = 'attachment; filename=foo.csv' | |
| writer = csv.writer(response, dialect=csv.excel) | |
| for i in qs: | |
| writer.writerow([i.foo, i.bar, i.baz, ...]) | |
| return response |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title></title> | |
| </head> | |
| <body> | |
| <div id="content">Please wait. <span id="loading"></span></div> | |
| <script type="text/javascript" src="/path/to/jquery.js"></script> | |
| <script> | |
| $(function(){ | |
| $.ajaxSetup({ cache: false, timeout: 360000 }); | |
| var url = "/poll_for_download/"; | |
| var i = 0; | |
| (function worker() { | |
| $.getJSON(url+"?task_id={{ task_id }}", function(data){ | |
| if(data.filename) { | |
| var file_url = url+"?filename="+data.filename; | |
| $("#content").html("If your download doesn't start automatically, please click <a href='"+file_url+"'>here</a>."); | |
| window.location.href = file_url; | |
| } else { | |
| setTimeout(worker, 5000); | |
| } | |
| }); | |
| })(); | |
| setInterval(function() { | |
| i = ++i % 4; | |
| $("#loading").html("loading"+Array(i+1).join(".")); | |
| }, 1000); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| from tasks import export_to_file | |
| def export(request, **kwargs): | |
| task = export_to_file.delay(**kwargs) | |
| return render_to_response("poll_for_download.html", | |
| {"task_id": task.task_id } | |
| def poll_for_download(request): | |
| task_id = request.GET.get("task_id") | |
| filename = request.GET.get("filename") | |
| if request.is_ajax(): | |
| result = export_to_file.AsyncResult(task_id) | |
| if result.ready(): | |
| return HttpResponse(json.dumps({"filename": result.get()})) | |
| return HttpResponse(json.dumps({"filename": None})) | |
| try: | |
| f = open("/path/to/export/"+filename) | |
| except: | |
| return HttpResponseForbidden() | |
| else: | |
| response = HttpResponse(file, mimetype='text/csv') | |
| response['Content-Disposition'] = 'attachment; filename=%s' % filename | |
| return response |
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| @task | |
| def export_to_file(**kwargs): | |
| filename = "%s.csv" % export_to_file.request.id | |
| qs = get_queryset(**kwargs) | |
| with open("%s%s" % ("/path/to/export/", filename), "w+") as f: | |
| writer = csv.writer(f, dialect=csv.excel) | |
| for i in qs: | |
| writer.writerow([i.foo, i.bar, i.baz, ...]) | |
| return filename |
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