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Handle timeout and misc. errors #19

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Handle timeout and misc. errors #19

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33 changes: 20 additions & 13 deletions amt/client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -81,19 +81,26 @@ def __init__(self, address, password, username='admin', protocol='http'):
self.password = password

def post(self, payload, ns=None):
resp = requests.post(self.uri,
headers={'content-type':
'application/soap+xml;charset=UTF-8'},
auth=HTTPDigestAuth(self.username, self.password),
data=payload)
resp.raise_for_status()
if ns:
rv = _return_value(resp.content, ns)
if rv == 0:
return 0
print(pp_xml(resp.content))
else:
return 0
try:
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I'd rather not do the try here. If this is consumed as a library, it makes sense for these exceptions to flow up to the next layer so that they can handle these errors however they like.

Instead I would put the exception handling and error messages printed to the user here -

amt/bin/amtctrl

Line 115 in d3e5d74

except requests.exceptions.HTTPError as e:

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@Rixillo Rixillo Mar 31, 2017 •
edited
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OK, that looks good.

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Another error I'd like to catch is "KeyboardInterrupt". If I control-C while looping calls to amtctrl, the stack trace dump makes a mess out of my terminal screen. Thanks.

^CTraceback (most recent call last):
  File "/usr/bin/amtctrl", line 5, in <module>
    pkg_resources.run_script('amt==0.6.0', 'amtctrl')
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 540, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1455, in run_script
    execfile(script_filename, namespace, namespace)
  File "/usr/lib/python2.7/site-packages/amt-0.6.0-py2.7.egg/EGG-INFO/scripts/amtctrl", line 119, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/amt-0.6.0-py2.7.egg/EGG-INFO/scripts/amtctrl", line 105, in main
    print(amt.wsman.friendly_power_state(client.power_status()))
  File "/usr/lib/python2.7/site-packages/amt-0.6.0-py2.7.egg/amt/client.py", line 144, in power_status
    data=payload)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 108, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 50, in request
    response = session.request(method=method, url=url, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 464, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 582, in send
    r = dispatch_hook('response', hooks, r, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/hooks.py", line 41, in dispatch_hook
    _hook_data = hook(hook_data, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/auth.py", line 188, in handle_401
    _r = r.connection.send(prep, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 370, in send
    timeout=timeout
  File "/usr/lib/python2.7/site-packages/urllib3/connectionpool.py", line 544, in urlopen
    body=body, headers=headers)
  File "/usr/lib/python2.7/site-packages/urllib3/connectionpool.py", line 372, in _make_request
    httplib_response = conn.getresponse(buffering=True)
  File "/usr/lib64/python2.7/httplib.py", line 1089, in getresponse
    response.begin()
  File "/usr/lib64/python2.7/httplib.py", line 444, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python2.7/httplib.py", line 400, in _read_status
    line = self.fp.readline(_MAXLINE + 1)
  File "/usr/lib64/python2.7/socket.py", line 476, in readline
    data = self._sock.recv(self._rbufsize)
KeyboardInterrupt

resp = requests.post(self.uri,
headers={'content-type':
'application/soap+xml;charset=UTF-8'},
auth=HTTPDigestAuth(self.username, self.password),
data=payload,
timeout=5.0)
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The request timeout is typically just a backstop, and I'd be concerned that 5 seconds might not be enough, How about we make it 30?

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I agree, 5 seconds is too short. It would be nice to make this a command line arg, because it can vary widely depending on your situation

resp.raise_for_status()
except requests.exceptions.Timeout:
print "Request timed out."
except requests.exceptions.RequestException as e:
print e
else:
if ns:
rv = _return_value(resp.content, ns)
if rv == 0:
return 0
print(pp_xml(resp.content))
else:
return 0

def power_on(self):
"""Power on the box."""
Expand Down