forget about uwsgi on windows. never really landed as
production-ready. fortunately iis can run python without any
hiccup and it's the current recommended way to deploy web2py
in production on windows.
that being said, I'm really eager to know how the hell you're
getting gevent mixed up with web2py's internal webserver,
which is not at all compatible with gevent. On Wednesday,
April 20, 2016 at 7:21:09 PM UTC+2, Kiran Subbaraman wrote:
Hello all, I use Windows 10 based laptop for my
development. By default, web2py serves its content via
the rocket server. My application makes use of the
'default' redis client () to connect to the local redis
server. I started noticing a stacktrace, in the cmd
prompt, from within which web2py has started:
|
CreatedbyMassimoDiPierro,Copyright2007-2016Version2.14.3-stable+timestamp.2016.03.26.17.54.43Databasedrivers
available:psycopg2,pymysql,imaplib,sqlite3,pg8000,pyodbc,mysqlconnector
please visit: http://127.0.0.1:8000/
<http://127.0.0.1:8000/>starting browser...please visit:
http://127.0.0.1:8000/
<http://127.0.0.1:8000/>starting
browser...2016-04-2020:26:54,003-Rocket.Errors.Port8000-ERROR
-Traceback(most recent call
last):File"d:\code\git\web2py\gluon\rocket.py",line
587,inlisten sock,addr
=self.listener.accept()File"D:\programs\open\python27\lib\site-packages\gevent\socket.py",line
316,inaccept
self._wait(self._read_event)File"D:\programs\open\python27\lib\site-packages\gevent\socket.py",line
300,in_wait
self.hub.wait(watcher)File"D:\programs\open\python27\lib\site-packages\gevent\hub.py",line
348,inwait result
=waiter.get()File"D:\programs\open\python27\lib\site-packages\gevent\hub.py",line
575,ingetreturnself.hub.switch()File"D:\programs\open\python27\lib\site-packages\gevent\hub.py",line
338,inswitchreturngreenlet.switch(self)LoopExit:Thisoperation
would block forever
|
The error in the error-ticket is:
|
<class'gevent.hub.LoopExit'>This operation would block
forever Version web2py™ Version
2.14.3-stable+timestamp.2016.03.26.17.54.43 Python
Python 2.7.10: D:\programs\open\python27\python.exe
(prefix: D:\programs\open\python27) Traceback Traceback
(most recent call last): File
"d:\code\git\web2py\gluon\restricted.py", line 227, in
restricted exec ccode in environment File
"d:/code/git/web2py/applications/myapp/controllers/myservice.py",
line 99, in <module> File
"d:\code\git\web2py\gluon\globals.py", line 417, in
<lambda> self._caller = lambda f: f() File
"d:\code\git\web2py\gluon\cache.py", line 661, in
wrapped_f rtn = func() File
"d:/code/git/web2py/applications/myapp/controllers/myservice.py",
line 68, in data data = api.get_data(url) File
"applications\myapp\modules\data\api.py", line 145, in
get_data return _get_data_for(url) if url else None
File "applications\myapp\modules\data\api.py", line 164,
in _get_data_for force_reload=rebuild File
"applications\myapp\modules\myapp_constants.py", line
460, in get_from_cache cache_value =
redis_cache.get(key) File
"D:\programs\open\python27\lib\site-packages\redis\client.py",
line 880, in get return self.execute_command('GET',
name) File
"D:\programs\open\python27\lib\site-packages\redis\client.py",
line 573, in execute_command return
self.parse_response(connection, command_name, **options)
File
"D:\programs\open\python27\lib\site-packages\redis\client.py",
line 585, in parse_response response =
connection.read_response() File
"D:\programs\open\python27\lib\site-packages\redis\connection.py",
line 577, in read_response response =
self._parser.read_response() File
"D:\programs\open\python27\lib\site-packages\redis\connection.py",
line 238, in read_response response =
self._buffer.readline() File
"D:\programs\open\python27\lib\site-packages\redis\connection.py",
line 168, in readline self._read_from_socket() File
"D:\programs\open\python27\lib\site-packages\redis\connection.py",
line 126, in _read_from_socket data =
self._sock.recv(socket_read_size) File
"D:\programs\open\python27\lib\site-packages\gevent\socket.py",
line 394, in recv self._wait(self._read_event) File
"D:\programs\open\python27\lib\site-packages\gevent\socket.py",
line 300, in _wait self.hub.wait(watcher) File
"D:\programs\open\python27\lib\site-packages\gevent\hub.py",
line 348, in wait result = waiter.get() File
"D:\programs\open\python27\lib\site-packages\gevent\hub.py",
line 575, in get return self.hub.switch() File
"D:\programs\open\python27\lib\site-packages\gevent\hub.py",
line 338, in switch return greenlet.switch(self)
LoopExit: This operation would block forever
|
I do not see this issue on my ubuntu linux deployment. I
suspected, without any evidence, that it may have to do
with process/threading between the rocket server to
redis_client, and that it could do with the
monkey_patching of socket in the gevent world. Again, I
do not have any evidence, other than the stacktrace. The
knee-jerk reaction was to see if using uwsgi or nginx on
windows alleviates this issue. The nearest discussion
thread, that I came across, that talks about setting up
such an environment (web2py without rocket, but uwsgi /
nginx) is this one:
https://groups.google.com/forum/#!searchin/web2py/nginx$20windows/web2py/NdV0CVX8zZs/wWiRxogLz4sJ
<https://groups.google.com/forum/#%21searchin/web2py/nginx$20windows/web2py/NdV0CVX8zZs/wWiRxogLz4sJ>
Any thoughts on what I could do or take a look at will
help. Thanks. In the meantime, I also intend to
* create a minimal app that is able to recreate this
issue.
* take a look at the web2py's redis-cache.
-- Resources: - http://web2py.com - http://web2py.com/book
(Documentation) - http://github.com/web2py/web2py
<http://github.com/web2py/web2py> (Source code) -
https://code.google.com/p/web2py/issues/list
<https://code.google.com/p/web2py/issues/list> (Report
Issues) --- You received this message because you are
subscribed to the Google Groups "web2py-users" group. To
unsubscribe from this group and stop receiving emails from
it, send an email to [email protected]
<javascript:>. For more options, visit
https://groups.google.com/d/optout
<https://groups.google.com/d/optout>.
