Environment is TG 1.0.4.4 running on Python 2.5.2 on a Windows XP
Professional host.
I need to use httplib in my TG app to connect to an embedded web
server for some status information, and am seeing different results
when I use the same code standalone or in my TG app.
For example the following code works correctly:
[BEGIN SNIP]
import httplib
import re
try:
conn = httplib.HTTPConnection('somehost:8000')
conn.connect()
conn.request('GET', '/controlplugin?usermonitor&ShowUserCount')
response = conn.getresponse()
body = response.read()
pattern = re.compile('\d+')
num_users = pattern.findall(body)[0]
return num_users
except httplib.HTTPException, ex:
return "unavailable"
[END SNIP]
Running this code works correctly: it parses the response back from
the embedded web server. The response returned looks like the
following:
<html>
<head/>
<body>
Message:Total Users = 0
<p/>
</body>
Presume for the moment that I have no control over the format over the
results returned.
Now if I take the same code and place it in the context of my TG app I
get the following:
[BEGIN SNIP]
def get_num_users(self, shard):
"""
contacts the userentrypoint of the shard and queries for the
num of connected users
"""
try:
conn = httplib.HTTPConnection('somehost:8000')
conn.connect()
conn.request('GET', '/controlplugin?
usermonitor&ShowUserCount')
response = conn.getresponse()
body = response.read()
conn.close()
pattern = re.compile('\d+')
num_users = pattern.findall(body)[0]
return num_users
except httplib.HTTPException, ex:
return 'unavailable'
[END SNIP]
This code is called from a get_shards() method @tg.expose()d from my
controllers.py. When I run it I observe the following:
2008-04-14 15:38:19,315 holocron.controllers INFO get_shards
connecting
requesting
2008-04-14 15:38:19,361 cherrypy.msg INFO HTTP: Page handler: <bound
method Root.get_shards of <holocron.controllers.Root object at
0x015DCDD0>>
Traceback (most recent call last):
File "c:\development\tools\python25\lib\site-packages\cherrypy-2.3.0-
py2.5.egg\cherrypy\_cphttptools.py", line 121, in _run
self.main()
File "c:\development\tools\python25\lib\site-packages\cherrypy-2.3.0-
py2.5.egg\cherrypy\_cphttptools.py", line 264, in main
body = page_handler(*virtual_path, **self.params)
File "<string>", line 3, in get_shards
File "c:\development\tools\python25\lib\site-packages
\TurboGears-1.0.4.4-py2.5.egg\turbogears\controllers.py", line 365, in
expose
*args, **kw)
File "<string>", line 5, in run_with_transaction
File "c:\development\tools\python25\lib\site-packages
\TurboGears-1.0.4.4-py2.5.egg\turbogears\database.py", line 356, in
so_rwt
retval = func(*args, **kw)
File "<string>", line 5, in _expose
File "c:\development\tools\python25\lib\site-packages
\TurboGears-1.0.4.4-py2.5.egg\turbogears\controllers.py", line 380, in
<lambda>
mapping, fragment, args, kw)))
File "c:\development\tools\python25\lib\site-packages
\TurboGears-1.0.4.4-py2.5.egg\turbogears\controllers.py", line 408, in
_execute_func
output = errorhandling.try_call(func, *args, **kw)
File "c:\development\tools\python25\lib\site-packages
\TurboGears-1.0.4.4-py2.5.egg\turbogears\errorhandling.py", line 72,
in try_call
return func(self, *args, **kw)
File "F:\workspace\Holocron\holocron\controllers.py", line 85, in
get_shards
shard_json["shardNumUsers"] = self.get_shard_num_users(shard)
File "F:\workspace\Holocron\holocron\controllers.py", line 67, in
get_shard_num_users
response = conn.getresponse()
File "C:\development\tools\Python25\lib\httplib.py", line 928, in
getresponse
response.begin()
File "C:\development\tools\Python25\lib\httplib.py", line 385, in
begin
version, status, reason = self._read_status()
File "C:\development\tools\Python25\lib\httplib.py", line 349, in
_read_status
raise BadStatusLine(line)
BadStatusLine
Request Headers:
COOKIE: tg-visit=470841c0d3564a31e5de0a7361ba8f05b4af95f0
Content-Length:
ACCEPT-CHARSET: ISO-8859-1,utf-8;q=0.7,*;q=0.7
USER-AGENT: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:
1.8.1.13) Gecko/20080311 Firefox/2.0.0.13
CONNECTION: keep-alive
REFERER: http://bwaagooch:8080/
X-REQUESTED-WITH: XMLHttpRequest
HOST: bwaagooch:8080
CONTENT-TYPE: application/x-www-form-urlencoded
ACCEPT: text/xml,application/xml,application/xhtml+xml,text/
html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Remote-Addr: 10.3.18.87
ACCEPT-LANGUAGE: en-us,en;q=0.5
Content-Type: application/x-www-form-urlencoded
ACCEPT-ENCODING: gzip,deflate
KEEP-ALIVE: 300
- agooch "GET /get_shards HTTP/1.1" 500 2875 "http://bwaagooch:8080/";
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/
20080311 Fi
refox/2.0.0.13"
2008-04-14 15:50:36,960 cherrypy.msg INFO ENGINE: SystemExit raised:
shutting down autoreloader
I see in httplib.py the following:
def _read_status(self):
# Initialize with Simple-Response defaults
line = self.fp.readline()
if self.debuglevel > 0:
print "reply:", repr(line)
if not line:
# Presumably, the server closed the connection before
# sending a valid response.
raise BadStatusLine(line)
A couple of questions raise themselves: 1) why should this library act
differently when run in the context of a tg app with the exact same
inputs, and 2) if this is a problem with malformatted response in the
content of a tg app how should I work around it?
Many thanks in advance,
-ag
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