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# Copyright (c) 2012 Mitch Garnaat http://garnaat.org/
# Copyright (c) 2012 Amazon.com, Inc. or its affiliates.
# All Rights Reserved
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
import requests
from .auth import SigV2Auth
from .credentials import get_credentials
from .dictresponse import Element, XmlHandler
class Service(object):
"""
This is a simple example service that connects to the EC2 endpoint
and supports a single request (DescribeInstances) to show how to
use the requests-based code rather than the standard boto code which
is based on httplib. At the moment, the only auth mechanism
supported is SigV2.
"""
def __init__(self, host='https://ec2.us-east-1.amazonaws.com',
path='/', api_version='2012-03-01', persona=None):
self.credentials = get_credentials(persona)
self.auth = SigV2Auth(self.credentials, api_version=api_version)
self.host = host
self.path = path
def get_response(self, params, list_marker=None):
r = requests.post(self.host, params=params,
hooks={'args': self.auth.add_auth})
r.encoding = 'utf-8'
body = r.text.encode('utf-8')
e = Element(list_marker=list_marker, pythonize_name=True)
h = XmlHandler(e, self)
h.parse(body)
return e
def build_list_params(self, params, items, label):
if isinstance(items, str):
items = [items]
for i in range(1, len(items) + 1):
params['%s.%d' % (label, i)] = items[i - 1]
def describe_instances(self, instance_ids=None):
params = {}
if instance_ids:
self.build_list_params(params, instance_ids, 'InstanceId')
return self.get_response(params)
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