288 lines
9.7 KiB
Python
288 lines
9.7 KiB
Python
# Copyright 2012 OpenStack Foundation
|
|
# All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
import copy
|
|
import httplib
|
|
import logging
|
|
import os
|
|
import socket
|
|
import StringIO
|
|
import urlparse
|
|
|
|
try:
|
|
import ssl
|
|
except ImportError:
|
|
#TODO(bcwaldon): Handle this failure more gracefully
|
|
pass
|
|
|
|
try:
|
|
import json
|
|
except ImportError:
|
|
import simplejson as json
|
|
|
|
# Python 2.5 compat fix
|
|
if not hasattr(urlparse, 'parse_qsl'):
|
|
import cgi
|
|
urlparse.parse_qsl = cgi.parse_qsl
|
|
|
|
|
|
from ceilometerclient import exc
|
|
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
USER_AGENT = 'python-ceilometerclient'
|
|
CHUNKSIZE = 1024 * 64 # 64kB
|
|
|
|
|
|
class HTTPClient(object):
|
|
|
|
def __init__(self, endpoint, **kwargs):
|
|
self.endpoint = endpoint
|
|
self.auth_token = kwargs.get('token')
|
|
self.connection_params = self.get_connection_params(endpoint, **kwargs)
|
|
|
|
@staticmethod
|
|
def get_connection_params(endpoint, **kwargs):
|
|
parts = urlparse.urlparse(endpoint)
|
|
|
|
_args = (parts.hostname, parts.port, parts.path)
|
|
_kwargs = {'timeout': (float(kwargs.get('timeout'))
|
|
if kwargs.get('timeout') else 600)}
|
|
|
|
if parts.scheme == 'https':
|
|
_class = VerifiedHTTPSConnection
|
|
_kwargs['ca_file'] = kwargs.get('ca_file', None)
|
|
_kwargs['cert_file'] = kwargs.get('cert_file', None)
|
|
_kwargs['key_file'] = kwargs.get('key_file', None)
|
|
_kwargs['insecure'] = kwargs.get('insecure', False)
|
|
elif parts.scheme == 'http':
|
|
_class = httplib.HTTPConnection
|
|
else:
|
|
msg = 'Unsupported scheme: %s' % parts.scheme
|
|
raise exc.InvalidEndpoint(msg)
|
|
|
|
return (_class, _args, _kwargs)
|
|
|
|
def get_connection(self):
|
|
_class = self.connection_params[0]
|
|
try:
|
|
return _class(*self.connection_params[1][0:2],
|
|
**self.connection_params[2])
|
|
except httplib.InvalidURL:
|
|
raise exc.InvalidEndpoint()
|
|
|
|
def log_curl_request(self, method, url, kwargs):
|
|
curl = ['curl -i -X %s' % method]
|
|
|
|
for (key, value) in kwargs['headers'].items():
|
|
header = '-H \'%s: %s\'' % (key, value)
|
|
curl.append(header)
|
|
|
|
conn_params_fmt = [
|
|
('key_file', '--key %s'),
|
|
('cert_file', '--cert %s'),
|
|
('ca_file', '--cacert %s'),
|
|
]
|
|
for (key, fmt) in conn_params_fmt:
|
|
value = self.connection_params[2].get(key)
|
|
if value:
|
|
curl.append(fmt % value)
|
|
|
|
if self.connection_params[2].get('insecure'):
|
|
curl.append('-k')
|
|
|
|
if 'body' in kwargs:
|
|
curl.append('-d \'%s\'' % kwargs['body'])
|
|
|
|
curl.append('%s%s' % (self.endpoint, url))
|
|
LOG.debug(' '.join(curl))
|
|
|
|
@staticmethod
|
|
def log_http_response(resp, body=None):
|
|
status = (resp.version / 10.0, resp.status, resp.reason)
|
|
dump = ['\nHTTP/%.1f %s %s' % status]
|
|
dump.extend(['%s: %s' % (k, v) for k, v in resp.getheaders()])
|
|
dump.append('')
|
|
if body:
|
|
dump.extend([body, ''])
|
|
LOG.debug('\n'.join(dump))
|
|
|
|
def _make_connection_url(self, url):
|
|
(_class, _args, _kwargs) = self.connection_params
|
|
base_url = _args[2]
|
|
return '%s/%s' % (base_url.rstrip('/'), url.lstrip('/'))
|
|
|
|
def _http_request(self, url, method, **kwargs):
|
|
"""Send an http request with the specified characteristics.
|
|
|
|
Wrapper around httplib.HTTP(S)Connection.request to handle tasks such
|
|
as setting headers and error handling.
|
|
"""
|
|
# Copy the kwargs so we can reuse the original in case of redirects
|
|
kwargs['headers'] = copy.deepcopy(kwargs.get('headers', {}))
|
|
kwargs['headers'].setdefault('User-Agent', USER_AGENT)
|
|
auth_token = self.auth_token()
|
|
if auth_token:
|
|
kwargs['headers'].setdefault('X-Auth-Token', auth_token)
|
|
|
|
self.log_curl_request(method, url, kwargs)
|
|
conn = self.get_connection()
|
|
|
|
try:
|
|
conn_url = self._make_connection_url(url)
|
|
conn.request(method, conn_url, **kwargs)
|
|
resp = conn.getresponse()
|
|
except socket.gaierror as e:
|
|
message = ("Error finding address for %(url)s: %(e)s"
|
|
% dict(url=url, e=e))
|
|
raise exc.InvalidEndpoint(message=message)
|
|
except (socket.error, socket.timeout) as e:
|
|
endpoint = self.endpoint
|
|
message = ("Error communicating with %(endpoint)s %(e)s"
|
|
% dict(endpoint=endpoint, e=e))
|
|
raise exc.CommunicationError(message=message)
|
|
|
|
body_iter = ResponseBodyIterator(resp)
|
|
|
|
# Read body into string if it isn't obviously image data
|
|
if resp.getheader('content-type', None) != 'application/octet-stream':
|
|
body_str = ''.join([chunk for chunk in body_iter])
|
|
self.log_http_response(resp, body_str)
|
|
body_iter = StringIO.StringIO(body_str)
|
|
else:
|
|
self.log_http_response(resp)
|
|
|
|
if 400 <= resp.status < 600:
|
|
LOG.warn("Request returned failure status.")
|
|
raise exc.from_response(resp)
|
|
elif resp.status in (301, 302, 305):
|
|
# Redirected. Reissue the request to the new location.
|
|
return self._http_request(resp['location'], method, **kwargs)
|
|
elif resp.status == 300:
|
|
raise exc.from_response(resp)
|
|
|
|
return resp, body_iter
|
|
|
|
def json_request(self, method, url, **kwargs):
|
|
kwargs.setdefault('headers', {})
|
|
kwargs['headers'].setdefault('Content-Type', 'application/json')
|
|
kwargs['headers'].setdefault('Accept', 'application/json')
|
|
|
|
if 'body' in kwargs:
|
|
kwargs['body'] = json.dumps(kwargs['body'])
|
|
|
|
resp, body_iter = self._http_request(url, method, **kwargs)
|
|
content_type = resp.getheader('content-type', None)
|
|
|
|
if resp.status == 204 or resp.status == 205 or content_type is None:
|
|
return resp, list()
|
|
|
|
if 'application/json' in content_type:
|
|
body = ''.join([chunk for chunk in body_iter])
|
|
try:
|
|
body = json.loads(body)
|
|
except ValueError:
|
|
LOG.error('Could not decode response body as JSON')
|
|
else:
|
|
body = None
|
|
|
|
return resp, body
|
|
|
|
def raw_request(self, method, url, **kwargs):
|
|
kwargs.setdefault('headers', {})
|
|
kwargs['headers'].setdefault('Content-Type',
|
|
'application/octet-stream')
|
|
return self._http_request(url, method, **kwargs)
|
|
|
|
|
|
class VerifiedHTTPSConnection(httplib.HTTPSConnection):
|
|
"""httplib-compatibile connection using client-side SSL authentication
|
|
|
|
:see http://code.activestate.com/recipes/
|
|
577548-https-httplib-client-connection-with-certificate-v/
|
|
"""
|
|
|
|
def __init__(self, host, port, key_file=None, cert_file=None,
|
|
ca_file=None, timeout=None, insecure=False):
|
|
httplib.HTTPSConnection.__init__(self, host, port, key_file=key_file,
|
|
cert_file=cert_file)
|
|
self.key_file = key_file
|
|
self.cert_file = cert_file
|
|
if ca_file is not None:
|
|
self.ca_file = ca_file
|
|
else:
|
|
self.ca_file = self.get_system_ca_file()
|
|
self.timeout = timeout
|
|
self.insecure = insecure
|
|
|
|
def connect(self):
|
|
"""Connect to a host on a given (SSL) port.
|
|
If ca_file is pointing somewhere, use it to check Server Certificate.
|
|
|
|
Redefined/copied and extended from httplib.py:1105 (Python 2.6.x).
|
|
This is needed to pass cert_reqs=ssl.CERT_REQUIRED as parameter to
|
|
ssl.wrap_socket(), which forces SSL to check server certificate against
|
|
our client certificate.
|
|
"""
|
|
sock = socket.create_connection((self.host, self.port), self.timeout)
|
|
|
|
if self._tunnel_host:
|
|
self.sock = sock
|
|
self._tunnel()
|
|
|
|
if self.insecure is True:
|
|
kwargs = {'cert_reqs': ssl.CERT_NONE}
|
|
else:
|
|
kwargs = {'cert_reqs': ssl.CERT_REQUIRED, 'ca_certs': self.ca_file}
|
|
|
|
if self.cert_file:
|
|
kwargs['certfile'] = self.cert_file
|
|
if self.key_file:
|
|
kwargs['keyfile'] = self.key_file
|
|
|
|
self.sock = ssl.wrap_socket(sock, **kwargs)
|
|
|
|
@staticmethod
|
|
def get_system_ca_file():
|
|
"""Return path to system default CA file."""
|
|
# Standard CA file locations for Debian/Ubuntu, RedHat/Fedora,
|
|
# Suse, FreeBSD/OpenBSD
|
|
ca_path = ['/etc/ssl/certs/ca-certificates.crt',
|
|
'/etc/pki/tls/certs/ca-bundle.crt',
|
|
'/etc/ssl/ca-bundle.pem',
|
|
'/etc/ssl/cert.pem']
|
|
for ca in ca_path:
|
|
if os.path.exists(ca):
|
|
return ca
|
|
return None
|
|
|
|
|
|
class ResponseBodyIterator(object):
|
|
"""A class that acts as an iterator over an HTTP response."""
|
|
|
|
def __init__(self, resp):
|
|
self.resp = resp
|
|
|
|
def __iter__(self):
|
|
while True:
|
|
yield self.next()
|
|
|
|
def next(self):
|
|
chunk = self.resp.read(CHUNKSIZE)
|
|
if chunk:
|
|
return chunk
|
|
else:
|
|
raise StopIteration()
|