Brian Waldon
3997f977fa
Expand exceptions to cover more failures cases. This adds CommunicationFailure to represent any failures while attempting to communicate with the remote endpoint. This also adds a new base exception class BaseException which should be used for all non-HTTP related failures. Change-Id: Ie3e1d45c520d816a3f491a85fde94a6c4edf295e
253 lines
8.2 KiB
Python
253 lines
8.2 KiB
Python
# Copyright 2012 OpenStack LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import copy
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import httplib
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import logging
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import socket
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import StringIO
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import urlparse
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try:
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import ssl
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except ImportError:
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#TODO(bcwaldon): Handle this failure more gracefully
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pass
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try:
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import json
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except ImportError:
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import simplejson as json
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# Python 2.5 compat fix
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if not hasattr(urlparse, 'parse_qsl'):
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import cgi
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urlparse.parse_qsl = cgi.parse_qsl
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from glanceclient import exc
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LOG = logging.getLogger(__name__)
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USER_AGENT = 'python-glanceclient'
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CHUNKSIZE = 1024 * 64 # 64kB
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class HTTPClient(object):
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def __init__(self, endpoint, **kwargs):
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self.endpoint = endpoint
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self.auth_token = kwargs.get('token')
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self.connection_params = self.get_connection_params(endpoint, **kwargs)
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@staticmethod
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def get_connection_params(endpoint, **kwargs):
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parts = urlparse.urlparse(endpoint)
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_args = (parts.hostname, parts.port)
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_kwargs = {'timeout': float(kwargs.get('timeout', 600))}
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if parts.scheme == 'https':
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_class = VerifiedHTTPSConnection
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_kwargs['ca_file'] = kwargs.get('ca_file', None)
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_kwargs['cert_file'] = kwargs.get('cert_file', None)
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_kwargs['key_file'] = kwargs.get('key_file', None)
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_kwargs['insecure'] = kwargs.get('insecure', False)
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elif parts.scheme == 'http':
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_class = httplib.HTTPConnection
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else:
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msg = 'Unsupported scheme: %s' % parts.scheme
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raise exc.InvalidEndpoint(msg)
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return (_class, _args, _kwargs)
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def get_connection(self):
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_class = self.connection_params[0]
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try:
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return _class(*self.connection_params[1],
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**self.connection_params[2])
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except httplib.InvalidUrl:
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raise exc.InvalidEndpoint()
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def log_curl_request(self, method, url, kwargs):
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curl = ['curl -i -X %s' % method]
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for (key, value) in kwargs['headers'].items():
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header = '-H \'%s: %s\'' % (key, value)
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curl.append(header)
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conn_params_fmt = [
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('key_file', '--key %s'),
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('cert_file', '--cert %s'),
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('ca_file', '--cacert %s'),
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]
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for (key, fmt) in conn_params_fmt:
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value = self.connection_params[2].get(key)
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if value:
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curl.append(fmt % value)
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if self.connection_params[2].get('insecure'):
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curl.append('-k')
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if 'body' in kwargs:
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curl.append('-d \'%s\'' % kwargs['body'])
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curl.append('%s%s' % (self.endpoint, url))
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LOG.debug(' '.join(curl))
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@staticmethod
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def log_http_response(resp, body=None):
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status = (resp.version / 10.0, resp.status, resp.reason)
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dump = ['\nHTTP/%.1f %s %s' % status]
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dump.extend(['%s: %s' % (k, v) for k, v in resp.getheaders()])
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dump.append('')
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if body:
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dump.extend([body, ''])
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LOG.debug('\n'.join(dump))
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def _http_request(self, url, method, **kwargs):
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""" Send an http request with the specified characteristics.
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Wrapper around httplib.HTTP(S)Connection.request to handle tasks such
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as setting headers and error handling.
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"""
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# Copy the kwargs so we can reuse the original in case of redirects
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kwargs['headers'] = copy.deepcopy(kwargs.get('headers', {}))
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kwargs['headers'].setdefault('User-Agent', USER_AGENT)
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if self.auth_token:
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kwargs['headers'].setdefault('X-Auth-Token', self.auth_token)
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self.log_curl_request(method, url, kwargs)
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conn = self.get_connection()
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try:
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conn.request(method, url, **kwargs)
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except (socket.error, socket.gaierror):
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raise exc.InvalidEndpoint()
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try:
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resp = conn.getresponse()
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except (socket.error, socket.timeout):
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raise exc.CommunicationError()
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body_iter = ResponseBodyIterator(resp)
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# Read body into string if it isn't obviously image data
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if resp.getheader('content-type', None) != 'application/octet-stream':
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body_str = ''.join([chunk for chunk in body_iter])
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self.log_http_response(resp, body_str)
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body_iter = StringIO.StringIO(body_str)
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else:
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self.log_http_response(resp)
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if 400 <= resp.status < 600:
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LOG.exception("Request returned failure status.")
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raise exc.from_response(resp)
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elif resp.status in (301, 302, 305):
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# Redirected. Reissue the request to the new location.
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return self._http_request(resp['location'], method, **kwargs)
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return resp, body_iter
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def json_request(self, method, url, **kwargs):
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kwargs.setdefault('headers', {})
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kwargs['headers'].setdefault('Content-Type', 'application/json')
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if 'body' in kwargs:
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kwargs['body'] = json.dumps(kwargs['body'])
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resp, body_iter = self._http_request(url, method, **kwargs)
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if 'application/json' in resp.getheader('content-type', None):
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body = ''.join([chunk for chunk in body_iter])
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try:
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body = json.loads(body)
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except ValueError:
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LOG.error('Could not decode response body as JSON')
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else:
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body = None
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return resp, body
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def raw_request(self, method, url, **kwargs):
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kwargs.setdefault('headers', {})
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kwargs['headers'].setdefault('Content-Type',
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'application/octet-stream')
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return self._http_request(url, method, **kwargs)
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class VerifiedHTTPSConnection(httplib.HTTPSConnection):
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"""httplib-compatibile connection using client-side SSL authentication
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:see http://code.activestate.com/recipes/
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577548-https-httplib-client-connection-with-certificate-v/
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"""
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def __init__(self, host, port, key_file=None, cert_file=None,
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ca_file=None, timeout=None, insecure=False):
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httplib.HTTPSConnection.__init__(self, host, port, key_file=key_file,
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cert_file=cert_file)
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self.key_file = key_file
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self.cert_file = cert_file
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self.ca_file = ca_file
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self.timeout = timeout
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self.insecure = insecure
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def connect(self):
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"""
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Connect to a host on a given (SSL) port.
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If ca_file is pointing somewhere, use it to check Server Certificate.
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Redefined/copied and extended from httplib.py:1105 (Python 2.6.x).
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This is needed to pass cert_reqs=ssl.CERT_REQUIRED as parameter to
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ssl.wrap_socket(), which forces SSL to check server certificate against
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our client certificate.
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"""
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sock = socket.create_connection((self.host, self.port), self.timeout)
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if self._tunnel_host:
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self.sock = sock
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self._tunnel()
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if self.insecure is True:
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kwargs = {'cert_reqs': ssl.CERT_NONE}
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else:
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kwargs = {'cert_reqs': ssl.CERT_REQUIRED, 'ca_certs': self.ca_file}
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if self.cert_file:
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kwargs['certfile'] = self.cert_file
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if self.key_file:
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kwargs['keyfile'] = self.key_file
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self.sock = ssl.wrap_socket(sock, **kwargs)
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class ResponseBodyIterator(object):
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"""A class that acts as an iterator over an HTTP response."""
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def __init__(self, resp):
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self.resp = resp
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def __iter__(self):
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while True:
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yield self.next()
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def next(self):
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chunk = self.resp.read(CHUNKSIZE)
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if chunk:
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return chunk
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else:
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raise StopIteration()
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