Channels: 'unicode' object has no attribute 'parseStreamServer'

[Arken94]

Howdy partners! First of all I would like to thank @andrewgodwin for such a great app and of course everyone who contributed as well.

I am receiving an error (traceback below) when I run ./manage.py runserver. The odd part is that if I run the server on any port other than 8000, it runs and works fine. For instance ./manage.py runserver localhost:8001 works perfectly fine. Another interesting aspect of this issue is that If I run daphne -p 8000 testproject.asgi:channel_layer then ./manage.py runworker everything seems to run fine. So the problem occurs only when I use runserver with port 8000 (default).

./manage.py runserver
Performing system checks...

System check identified no issues (0 silenced).
January 10, 2017 - 01:02:44
Django version 1.9.7, using settings 'testproject.settings'
Starting Channels development server at http://127.0.0.1:8000/
Channel layer default (asgiref.inmemory.ChannelLayer)
Quit the server with CONTROL-C.
2017-01-10 01:02:44,265 - INFO - worker - Listening on channels http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,265 - INFO - worker - Listening on channels http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,266 - INFO - worker - Listening on channels http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,266 - INFO - worker - Listening on channels http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,267 - INFO - server - Using busy-loop synchronous mode on channel layer
2017-01-10 01:02:44,267 - INFO - server - Listening on endpoint tcp:port=8000:interface=127.0.0.1
Unhandled exception in thread started by
Traceback (most recent call last):
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper
fn(args, *kwargs)
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.7/site-packages/channels/management/commands/runserver.py", line 89, in inner_run
root_path=getattr(settings, 'FORCE_SCRIPT_NAME', '') or '',
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.7/site-packages/daphne/server.py", line 96, in run
ep = serverFromString(reactor, socket_description)
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.7/site-packages/twisted/internet/endpoints.py", line 1522, in serverFromString
return _serverFromStringLegacy(reactor, description, _NO_DEFAULT)
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.7/site-packages/twisted/internet/endpoints.py", line 1438, in _serverFromStringLegacy
return plugin.parseStreamServer(reactor, args, *kw)
AttributeError: 'unicode' object has no attribute 'parseStreamServer'

Traceback is posted above.

Im using daphne 1.0, channels 1.0, django 1.9.7, asgiref 1.0, Im also using the InMemory layer.

please help.

[germanjoey]

+1, same issue from me. And thanks for sharing the temporary workaround,
using port 8001!

On Mon, Jan 9, 2017 at 4:04 PM, Arken94 [e-mail] wrote:

Howdy partners! First of all I would like to thank @andrewgodwin
https://github.com/andrewgodwin for such a great app and of course
everyone who contributed as well.

I am receiving an error (traceback below) when I run ./manage.py runserver.
The odd part is that if I run the server on any port other than 8000, it
runs and works fine. For instance ./manage.py runserver localhost:8001
works perfectly fine. Another interesting aspect of this issue is that If I
run daphne -p 8000 django_project.asgi:channel_layer then ./manage.py
runworker everything seems to run fine. So the problem occurs only when I
use runserver with port 8000 (default).

./manage.py runserver
Performing system checks...

System check identified no issues (0 silenced).
January 10, 2017 - 01:02:44
Django version 1.9.7, using settings 'testproject.settings'
Starting Channels development server at http://127.0.0.1:8000/
Channel layer default (asgiref.inmemory.ChannelLayer)
Quit the server with CONTROL-C.
2017-01-10 01:02:44,265 - INFO - worker - Listening on channels
http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,265 - INFO - worker - Listening on channels
http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,266 - INFO - worker - Listening on channels
http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,266 - INFO - worker - Listening on channels
http.request, websocket.connect, websocket.disconnect, websocket.receive
2017-01-10 01:02:44,267 - INFO - server - Using busy-loop synchronous mode
on channel layer
2017-01-10 01:02:44,267 - INFO - server - Listening on endpoint
tcp:port=8000:interface=127.0.0.1
Unhandled exception in thread started by
Traceback (most recent call last):
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.
7/site-packages/django/utils/autoreload.py", line 226, in wrapper
fn(args, *kwargs)
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.
7/site-packages/channels/management/commands/runserver.py", line 89, in
inner_run
root_path=getattr(settings, 'FORCE_SCRIPT_NAME', '') or '',
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.
7/site-packages/daphne/server.py", line 96, in run
ep = serverFromString(reactor, socket_description)
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.
7/site-packages/twisted/internet/endpoints.py", line 1522, in
serverFromString
return _serverFromStringLegacy(reactor, description, _NO_DEFAULT)
File "/Users/arkenibrahim/.virtualenvs/book/lib/python2.
7/site-packages/twisted/internet/endpoints.py", line 1438, in
_serverFromStringLegacy
return plugin.parseStreamServer(reactor, args, *kw)
AttributeError: 'unicode' object has no attribute 'parseStreamServer'

Traceback is posted above.

Im using daphne 1.0, channels 1.0, django 1.9.7, asgiref 1.0

please help.

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[slothyrulez]

Running on a vagrant VM:

First try:

---

python manage.py runserver 8000
...
Starting Channels development server at http://127.0.0.1:8000/
...
AttributeError: 'unicode' object has no attribute 'parseStreamServer'

---

Second try:

---

python manage.py runserver 8001
...
Starting Channels development server at http://127.0.0.1:8001/
....
AttributeError: 'unicode' object has no attribute 'parseStreamServer'

---

Third try:

---

python manage.py runserver localhost:8000
....
Starting Channels development server at http://localhost:8000/
....
NO ERRORS

Fourth try:

---

python manage.py runserver localhost:8001
...
Starting Channels development server at http://localhost:8001/
...
NO ERRORS

[andrewgodwin]

OK, I've traced this down to happening on Python 2 only, which is why I didn't see it in testing.

[andrewgodwin]

Fixed in daphne version 1.0.1; update to that and it should work all the time. Let me know if it doesn't.

[Arken94]

Thanks a ton @andrewgodwin. I tried debugging the problem on my own a little and got stumped, do you think you could let me in on what the problem was?

[andrewgodwin]

It looks like the Twisted serverFromString method only expects a str under Python 2; the default in the runserver command is written as a string literal with unicode literals turned on, so it comes through as unicode and things explode. I mostly just tried different variations until I broke it, cast it to a str, and then made sure that worked under both versions.

[slothyrulez]

Awesome speed.

Tested on p2.7 and p3.4 and working

Many thanks