Also note, I just copy-pasted the same SyntaxError (kwarg before arg). On Friday, March 18, 2016 at 3:40:22 PM UTC-4, Vincent wrote: > > Hey Andrew, > > Thanks for looking through all that, and for the reply. > > I like the simplicity of your updated examples. I started to make a > counter-example to suggest that `include` be inside of a `route` ( > https://gist.github.com/orokusaki/c0c934013ee7911071ef). > > But then, as I thought through this, I think I like your example almost* > exactly like it is, but I'm afraid there might be a problem: > > Given your example, any message how would a 'websocket.connect' message at > the path `notifications/foo/` be routed, giving this example: > > routing = [ > route("websocket.connect", ChatConnect), > include(path="^notifications", "notification.routing.routing"), > ] > > Given that the chat route is the first match, wouldn't the notifications > route never be used? Would path need to be required, so that the matching > would be similar to `urlpatterns`? Otherwise, we're allowing routing based > on channel name or path again? Maybe I'm misunderstanding. > > On Friday, March 18, 2016 at 10:58:41 AM UTC-4, Andrew Godwin wrote: >> >> Hi Vincent, >> >> I think you make some good points - in particular, I think includes are >> probably a necessity, as you say. However, I disagree we should let people >> have either channel->url or url->channel; I'd like us not to try and give >> people multiple ways to do things if we can help it, especially in an >> ecosystem of third-party apps. >> >> You can't rename routing.py to channels.py, however, as then the import >> names will clash with the `channels` third-party app if the user hasn't >> turned on absolute imports. >> >> I'd build on your proposal and say the following: >> >> --- >> >> Routing should be a list of pattern matches rather than a dict, so you >> can spread it across multiple includes sensibly. Each entry in the list >> will be a route() match object that takes a channel name (it has to be a >> name, no regular expressions here) as a required argument, and an optional >> `path` argument that's a regular expression matched against the incoming >> message `path`. >> >> In fact, the routing will be generic, so you can regex against any >> primary message attribute you know will be present - for example, `method` >> for HTTP, or in the SMS example, by country code. It'll work like URL >> routing too and let you capture groups to be passed to the consumer (but >> only by name, to avoid confusion when a user matches against multiple >> message attributes and there's no defined ordering). >> >> The include() function will take any keyword argument and do prefixing >> like it does now for URLs. >> >> Example: >> >> routing = [ >> route("http.request", ViewConsumer), >> route("websocket.connect", path="^chat/(?P<room>[^/]+)/$", >> ChatConnect), >> route("sms.receive", sender="+44(?P<local_number>[0-9]+)$", >> UkSmsConsumer), >> include(path="^notifications", "notification.routing.routing"), >> ] >> >> It also means that the simple example case stays quite readable: >> >> routing = [ >> route("websocket.connect", ws_connect), >> route("websocket.receive", ws_receive), >> route("websocket.disconnect", ws_disconnect), >> ] >> >> We can also have channels upconvert the old dict format into this >> trivially to preserve all the existing code and examples, like Jacob's >> article. >> >> Andrew >> >> On Fri, Mar 18, 2016 at 3:48 AM, Vincent <thebe...@gmail.com> wrote: >> >>> Jacob, Florian, Andrew, >>> >>> I've spent the last 200 minutes thinking this through and writing, and >>> here's what I've come up with: >>> >>> https://gist.github.com/orokusaki/c67d46965a4ebeb3035a >>> >>> Below are the full contents of that Gist (but I recommend the Gist for >>> formatting). >>> >>> I also created https://github.com/andrewgodwin/channels/issues/87 last >>> weekend (re: your static files point above, Jacob). >>> >>> ### Problem >>> >>> 1. Channel / URL routing is 2-dimensional (compared with 1D URL >>> handling in Django) >>> 2. This creates a chicken / egg problem between channel name and URL >>> path >>> 2. That's illustrated by the discrepancy between Florian's URL -> >>> channel and Andrew's channel -> URL >>> 3. Put a Channel on the Y axis and URL are on the X axis, and the >>> intersection is where a Consumer comes into play >>> >>> ### Considerations >>> >>> Here are some design considerations for my API proposal: >>> >>> 1. Includes - because nobody wants to all of their channels / URLs in >>> a project-level module >>> 2. URL generation for channels with URLs >>> 3. The following duplicate include functionality works perfectly in >>> Django currently with URLs >>> 4. `urlpatterns` are kepts in `urls.py` >>> 5. So, I've renamed `routing.py` to `channels.py` - after all, we're >>> defining `channelpatterns` >>> 6. Either channel name OR URL has to come first, so that we don't need >>> a 2D graph in Python for routing consumers >>> >>> Project-level channels: >>> >>> # channels.py >>> channelpatterns = [ >>> channel(r'^websocket\.', include('chat.channels', >>> namespace='chat')), >>> channel(r'^websocket\.', include('game.channels', >>> namespace='game')), >>> channel( >>> r'^websocket', >>> name='active-visitors', >>> urls=[ >>> url(r'^active-visitors/$', VisitorCount.as_consumer()), >>> ] >>> ), >>> ] >>> >>> App-level channels: >>> >>> # game/channels.py >>> channelpatterns = [ >>> channel( >>> r'^receive', >>> name='receive', >>> urls=[ >>> url(r'^game/moves/up/$', >>> Move.as_consumer(direction='up'), name='move-up'), >>> url(r'^game/moves/down/$', >>> Move.as_consumer(direction='down'), name='move-down'), >>> ] >>> ), >>> ] >>> >>> Channel routing would be handled similar to URLs in Django. >>> >>> Given the above, getting the Channel URL for "moving up" in game could >>> be: `{% channel 'game:receive:move-up' %}` >>> >>> Here's an example of `websocket.connect` @ `/game/moves/up/` >>> >>> 1. Encounter first match (the WebSocket channel named `chat`) >>> 2. Include `chat.channels` >>> 3. Determine there is no match >>> 4. Encounter second match (the WebSocket channel named `game`) >>> 5. Include `game.channels` >>> 6. Encounter first URL match (the `/game/moves/up/` pattern) >>> 7. Delegate to `Move` consumer with default `direction='up'` >>> >>> But wait, there's more :) >>> >>> Since Channel + URL is 2-dimensional, I propose we allow `include` at >>> the `url` level and at the `channel` level. >>> >>> # channels.py >>> channelpatterns = [ >>> channel( >>> r'^websocket\.receive$', >>> urls=[ >>> url(r'^game/', include('chat.channels', >>> namespace='game')), >>> ] >>> ), >>> ] >>> >>> Then: >>> >>> # game/channels.py >>> channelpatterns = [ >>> channel( >>> r'^$', >>> name='moves', >>> urls=[ >>> url(r'^moves/up$', Move.as_consumer(direction='up'), >>> name='move-up'), >>> url(r'^moves/down$', Move.as_consumer(direction='down'), >>> name='move-down'), >>> ] >>> ) >>> ] >>> >>> Since I'm allowing `include` in a `channel` or any of its `urls`, either >>> breadth-first search (giving URls / URL includes precedence) or depth-first >>> search (giving channel includes precedence) could be used. I'd argue for >>> breadth-first. >>> >>> >>> On Thursday, March 17, 2016 at 12:42:05 PM UTC-4, Jacob Kaplan-Moss >>> wrote: >>>> >>>> Hi folks (and especially Andrew): >>>> >>>> I've just completed writing an example Channels app [1] for an article >>>> about Channels [2]. Overall it was a super-pleasant experience: Channels >>>> seems pretty solid, the APIs make sense to me, and I couldn't be more >>>> excited about the new things this'll let me do! >>>> >>>> In the interests of making this thing as solid as possible before we >>>> merge it into Django, I do have some feedback on some of the hiccups I >>>> encountered. Roughly in order of severity (as I perceive it), they are: >>>> >>>> 1. Debugging errors: >>>> >>>> I found debugging errors that happen in a consumer to be *really* >>>> difficult -- errors mostly presented as things just silently not working. >>>> It took a ton of messing around with logging setups before I could get >>>> anything of use dumped to the console. This isn't strictly a Channels >>>> issue >>>> (I've noted similar problems with AJAX views and errors in Celery tasks), >>>> but I think Channels sorta brings the issue to a head. >>>> >>>> I think we need some better defaults, and simple, clear documentation, >>>> to make sure that exceptions go somewhere useful. >>>> >>>> 2. Static files: >>>> >>>> I had trouble getting static files served. I'm used to using Whitenoise >>>> (http://whitenoise.evans.io/en/stable/) for small-to-medium-ish sites >>>> that don't need a proper static server, but of course it doesn't work with >>>> Channels since Channels doesn't use WSGI! I found the (undocumented) >>>> StaticFilesConsumer ( >>>> https://github.com/jacobian/channels-example/blob/master/chat/routing.py#L5-L8), >>>> >>>> but that feels less than ideal. >>>> >>>> I think this might be an opportunity, however. If Daphne learns how to >>>> serve static files (perhaps via optional integration with Whitenoise?), >>>> this would actually make static media in Django a bit easier by default. >>>> >>>> [I would be happy to work on this if I get a thumbsup.] >>>> >>>> 3. WebSocket routing: >>>> >>>> Channels routes all WebSocket connections to a single set of consumers >>>> (the `websocket.*` consumers). This means that if you want multiple >>>> WebSocket URLs in a single app you need to manually parse the path. And, >>>> to >>>> make things more complicated, you only get the WebSocket path passed in >>>> the >>>> connection message, so you have to also use a channel session to keep >>>> track. >>>> >>>> This feels like a distinct step back from the URL routing we already >>>> have in Django, and it was surprising to me to have to do this by hand. It >>>> definitely felt like Channels is missing some sort of WebSocket URL >>>> router. >>>> >>>> I had a brief chat with Andrew, who indicates that he'd planned for >>>> this to be a post-1.0 feature. I'm not sure I agree - it feels pretty >>>> fundamental - but I'd like to hear other thoughts. >>>> >>>> [This is another thing I'd be interested in working on, assuming a >>>> thumbs.] >>>> >>>> --- >>>> >>>> Has anyone else here played with Channels? Are there other things I'm >>>> missing that might need to be included before we merge this? >>>> >>>> Jacob >>>> >>>> [1] https://github.com/jacobian/channels-example >>>> >>>> [2] >>>> https://blog.heroku.com/archives/2016/3/17/in_deep_with_django_channels_the_future_of_real_time_apps_in_django >>>> ? >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Django developers (Contributions to Django itself)" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to django-develop...@googlegroups.com. >>> To post to this group, send email to django-d...@googlegroups.com. >>> Visit this group at https://groups.google.com/group/django-developers. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/django-developers/747fcf54-ff68-470c-ba0d-9e52b4cb85f6%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/django-developers/747fcf54-ff68-470c-ba0d-9e52b4cb85f6%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >>> For more options, visit https://groups.google.com/d/optout. >>> >> >>
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