import threading

from django.http import FileResponse, HttpResponse

from django.urls import path

from django.views.decorators.csrf import csrf_exempt

def hello(request):

    name = request.GET.get("name") or "World"

    return HttpResponse("Hello %s!" % name)

def hello_meta(request):

    return HttpResponse(

        "From %s" % request.META.get("HTTP_REFERER") or "",

        content_type=request.META.get("CONTENT_TYPE"),

    )

def sync_waiter(request):

    with sync_waiter.lock:

        sync_waiter.active_threads.add(threading.current_thread())

    sync_waiter.barrier.wait(timeout=0.5)

    return hello(request)

@csrf_exempt

def post_echo(request):

    return HttpResponse(request.body)

sync_waiter.active_threads = set()

sync_waiter.lock = threading.Lock()

sync_waiter.barrier = threading.Barrier(2)

test_filename = __file__

urlpatterns = [

    path("", hello),

    path("file/", lambda x: FileResponse(open(test_filename, "rb"))),

    path("meta/", hello_meta),

    path("post/", post_echo),

    path("wait/", sync_waiter),

]