def suite_csv_stream(request, job, pk):
"""
Django is designed for short-lived requests.
Streaming responses will tie a worker process for the entire duration of the response.
This may result in poor performance.
Generally speaking, you should perform expensive tasks outside of the
request-response cycle, rather than resorting to a streamed response.
https://docs.djangoproject.com/en/1.8/ref/request-response/#django.http.StreamingHttpResponse
https://docs.djangoproject.com/en/1.8/howto/outputting-csv/
"""
job = get_object_or_404(TestJob, pk=job)
test_suite = get_object_or_404(TestSuite, name=pk, job=job)
check_request_auth(request, job)
querydict = request.GET
offset = int(querydict.get("offset", default=0))
limit = int(querydict.get("limit", default=0))
pseudo_buffer = StreamEcho()
writer = csv.writer(pseudo_buffer)
testcases = get_testcases_with_limit(test_suite, limit, offset)
response = StreamingHttpResponse(
(writer.writerow(export_testcase(row)) for row in testcases),
content_type="text/csv",
)
filename = "lava_stream_%s.csv" % test_suite.name
response["Content-Disposition"] = 'attachment; filename="%s"' % filename
return response
def testjob_csv(request, job):
job = get_object_or_404(TestJob, pk=job)
check_request_auth(request, job)
def testjob_stream(suites, pseudo_buffer):
fieldnames = testcase_export_fields()
writer = csv.DictWriter(pseudo_buffer, fieldnames=fieldnames)
# writer.writeheader does not return the string while writer.writerow
# does. Copy writeheader code from csv.py and yield the value.
yield writer.writerow(dict(zip(fieldnames, fieldnames)))
for test_suite in suites:
for test_case in test_suite.testcase_set.all():
yield writer.writerow(export_testcase(test_case))
suites = job.testsuite_set.all().prefetch_related(
"test_sets__test_cases__actionlevels"
)
pseudo_buffer = StreamEcho()
response = StreamingHttpResponse(
testjob_stream(suites, pseudo_buffer), content_type="text/csv"
)
filename = "lava_%s.csv" % job.id
response["Content-Disposition"] = 'attachment; filename="%s"' % filename
return response
