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:
Created by Massimo Di Pierro, Copyright 2007-2016
Version 2.14.3-stable+timestamp.2016.03.26.17.54.43
Database drivers available: psycopg2, pymysql, imaplib, sqlite3, pg8000,
pyodbc, mysqlconnector
please visit:
http://127.0.0.1:8000/
starting browser...
please visit:
http://127.0.0.1:8000/
starting browser...
2016-04-20 20:26:54,003 - Rocket.Errors.Port8000 - ERROR - Traceback (most
recent call last):
File "d:\code\git\web2py\gluon\rocket.py", line 587, in listen
sock, addr = self.listener.accept()
File "D:\programs\open\python27\lib\site-packages\gevent\socket.py", line
316, in accept
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
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
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 (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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