root / api / util.py @ adee02b8
History | View | Annotate | Download (9.5 kB)
1 |
# Copyright 2011 GRNET S.A. All rights reserved.
|
---|---|
2 |
#
|
3 |
# Redistribution and use in source and binary forms, with or
|
4 |
# without modification, are permitted provided that the following
|
5 |
# conditions are met:
|
6 |
#
|
7 |
# 1. Redistributions of source code must retain the above
|
8 |
# copyright notice, this list of conditions and the following
|
9 |
# disclaimer.
|
10 |
#
|
11 |
# 2. Redistributions in binary form must reproduce the above
|
12 |
# copyright notice, this list of conditions and the following
|
13 |
# disclaimer in the documentation and/or other materials
|
14 |
# provided with the distribution.
|
15 |
#
|
16 |
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
17 |
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
18 |
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
19 |
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
20 |
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
21 |
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
22 |
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
23 |
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
24 |
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 |
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
26 |
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
27 |
# POSSIBILITY OF SUCH DAMAGE.
|
28 |
#
|
29 |
# The views and conclusions contained in the software and
|
30 |
# documentation are those of the authors and should not be
|
31 |
# interpreted as representing official policies, either expressed
|
32 |
# or implied, of GRNET S.A.
|
33 |
|
34 |
from datetime import timedelta, tzinfo |
35 |
from functools import wraps |
36 |
from random import choice |
37 |
from string import ascii_letters, digits |
38 |
from time import time |
39 |
from traceback import format_exc |
40 |
from wsgiref.handlers import format_date_time |
41 |
|
42 |
import datetime |
43 |
import dateutil.parser |
44 |
import logging |
45 |
|
46 |
from django.conf import settings |
47 |
from django.http import HttpResponse |
48 |
from django.template.loader import render_to_string |
49 |
from django.utils import simplejson as json |
50 |
|
51 |
from synnefo.api.faults import (Fault, BadRequest, BuildInProgress, |
52 |
ItemNotFound, ServiceUnavailable, Unauthorized) |
53 |
from synnefo.db.models import (SynnefoUser, Flavor, Image, ImageMetadata, |
54 |
VirtualMachine, VirtualMachineMetadata, |
55 |
Network, NetworkInterface) |
56 |
|
57 |
|
58 |
class UTC(tzinfo): |
59 |
def utcoffset(self, dt): |
60 |
return timedelta(0) |
61 |
|
62 |
def tzname(self, dt): |
63 |
return 'UTC' |
64 |
|
65 |
def dst(self, dt): |
66 |
return timedelta(0) |
67 |
|
68 |
|
69 |
def isoformat(d): |
70 |
"""Return an ISO8601 date string that includes a timezone."""
|
71 |
|
72 |
return d.replace(tzinfo=UTC()).isoformat()
|
73 |
|
74 |
def isoparse(s): |
75 |
"""Parse an ISO8601 date string into a datetime object."""
|
76 |
|
77 |
if not s: |
78 |
return None |
79 |
|
80 |
try:
|
81 |
since = dateutil.parser.parse(s) |
82 |
utc_since = since.astimezone(UTC()).replace(tzinfo=None)
|
83 |
except ValueError: |
84 |
raise BadRequest('Invalid changes-since parameter.') |
85 |
|
86 |
now = datetime.datetime.now() |
87 |
if utc_since > now:
|
88 |
raise BadRequest('changes-since value set in the future.') |
89 |
|
90 |
if now - utc_since > timedelta(seconds=settings.POLL_LIMIT):
|
91 |
raise BadRequest('Too old changes-since value.') |
92 |
|
93 |
return utc_since
|
94 |
|
95 |
def random_password(length=8): |
96 |
pool = ascii_letters + digits |
97 |
return ''.join(choice(pool) for i in range(length)) |
98 |
|
99 |
|
100 |
def get_vm(server_id, owner): |
101 |
"""Return a VirtualMachine instance or raise ItemNotFound."""
|
102 |
|
103 |
try:
|
104 |
server_id = int(server_id)
|
105 |
return VirtualMachine.objects.get(id=server_id, owner=owner)
|
106 |
except ValueError: |
107 |
raise BadRequest('Invalid server ID.') |
108 |
except VirtualMachine.DoesNotExist:
|
109 |
raise ItemNotFound('Server not found.') |
110 |
|
111 |
def get_vm_meta(vm, key): |
112 |
"""Return a VirtualMachineMetadata instance or raise ItemNotFound."""
|
113 |
|
114 |
try:
|
115 |
return VirtualMachineMetadata.objects.get(meta_key=key, vm=vm)
|
116 |
except VirtualMachineMetadata.DoesNotExist:
|
117 |
raise ItemNotFound('Metadata key not found.') |
118 |
|
119 |
def get_image(image_id, owner): |
120 |
"""Return an Image instance or raise ItemNotFound."""
|
121 |
|
122 |
try:
|
123 |
image_id = int(image_id)
|
124 |
return Image.objects.get(id=image_id, owner=owner)
|
125 |
except ValueError: |
126 |
raise BadRequest('Invalid image ID.') |
127 |
except Image.DoesNotExist:
|
128 |
raise ItemNotFound('Image not found.') |
129 |
|
130 |
def get_image_meta(image, key): |
131 |
"""Return a ImageMetadata instance or raise ItemNotFound."""
|
132 |
|
133 |
try:
|
134 |
return ImageMetadata.objects.get(meta_key=key, image=image)
|
135 |
except ImageMetadata.DoesNotExist:
|
136 |
raise ItemNotFound('Metadata key not found.') |
137 |
|
138 |
def get_flavor(flavor_id): |
139 |
"""Return a Flavor instance or raise ItemNotFound."""
|
140 |
|
141 |
try:
|
142 |
flavor_id = int(flavor_id)
|
143 |
return Flavor.objects.get(id=flavor_id)
|
144 |
except ValueError: |
145 |
raise BadRequest('Invalid flavor ID.') |
146 |
except Flavor.DoesNotExist:
|
147 |
raise ItemNotFound('Flavor not found.') |
148 |
|
149 |
def get_network(network_id, owner): |
150 |
"""Return a Network instance or raise ItemNotFound."""
|
151 |
|
152 |
try:
|
153 |
if network_id == 'public': |
154 |
return Network.objects.get(public=True) |
155 |
else:
|
156 |
network_id = int(network_id)
|
157 |
return Network.objects.get(id=network_id, owner=owner)
|
158 |
except ValueError: |
159 |
raise BadRequest('Invalid network ID.') |
160 |
except Network.DoesNotExist:
|
161 |
raise ItemNotFound('Network not found.') |
162 |
|
163 |
def get_nic(machine, network): |
164 |
try:
|
165 |
return NetworkInterface.objects.get(machine=machine, network=network)
|
166 |
except NetworkInterface.DoesNotExist:
|
167 |
raise ItemNotFound('Server not connected to this network.') |
168 |
|
169 |
|
170 |
def get_request_dict(request): |
171 |
"""Returns data sent by the client as a python dict."""
|
172 |
|
173 |
data = request.raw_post_data |
174 |
if request.META.get('CONTENT_TYPE').startswith('application/json'): |
175 |
try:
|
176 |
return json.loads(data)
|
177 |
except ValueError: |
178 |
raise BadRequest('Invalid JSON data.') |
179 |
else:
|
180 |
raise BadRequest('Unsupported Content-Type.') |
181 |
|
182 |
def update_response_headers(request, response): |
183 |
if request.serialization == 'xml': |
184 |
response['Content-Type'] = 'application/xml' |
185 |
elif request.serialization == 'atom': |
186 |
response['Content-Type'] = 'application/atom+xml' |
187 |
else:
|
188 |
response['Content-Type'] = 'application/json' |
189 |
|
190 |
if settings.TEST:
|
191 |
response['Date'] = format_date_time(time())
|
192 |
|
193 |
def render_metadata(request, metadata, use_values=False, status=200): |
194 |
if request.serialization == 'xml': |
195 |
data = render_to_string('metadata.xml', {'metadata': metadata}) |
196 |
else:
|
197 |
if use_values:
|
198 |
d = {'metadata': {'values': metadata}} |
199 |
else:
|
200 |
d = {'metadata': metadata}
|
201 |
data = json.dumps(d) |
202 |
return HttpResponse(data, status=status)
|
203 |
|
204 |
def render_meta(request, meta, status=200): |
205 |
if request.serialization == 'xml': |
206 |
data = render_to_string('meta.xml', {'meta': meta}) |
207 |
else:
|
208 |
data = json.dumps({'meta': {meta.meta_key: meta.meta_value}})
|
209 |
return HttpResponse(data, status=status)
|
210 |
|
211 |
def render_fault(request, fault): |
212 |
if settings.DEBUG or settings.TEST: |
213 |
fault.details = format_exc(fault) |
214 |
|
215 |
if request.serialization == 'xml': |
216 |
data = render_to_string('fault.xml', {'fault': fault}) |
217 |
else:
|
218 |
d = {fault.name: { |
219 |
'code': fault.code,
|
220 |
'message': fault.message,
|
221 |
'details': fault.details}}
|
222 |
data = json.dumps(d) |
223 |
|
224 |
resp = HttpResponse(data, status=fault.code) |
225 |
update_response_headers(request, resp) |
226 |
return resp
|
227 |
|
228 |
|
229 |
def request_serialization(request, atom_allowed=False): |
230 |
"""Return the serialization format requested.
|
231 |
|
232 |
Valid formats are 'json', 'xml' and 'atom' if `atom_allowed` is True.
|
233 |
"""
|
234 |
|
235 |
path = request.path |
236 |
|
237 |
if path.endswith('.json'): |
238 |
return 'json' |
239 |
elif path.endswith('.xml'): |
240 |
return 'xml' |
241 |
elif atom_allowed and path.endswith('.atom'): |
242 |
return 'atom' |
243 |
|
244 |
for item in request.META.get('HTTP_ACCEPT', '').split(','): |
245 |
accept, sep, rest = item.strip().partition(';')
|
246 |
if accept == 'application/json': |
247 |
return 'json' |
248 |
elif accept == 'application/xml': |
249 |
return 'xml' |
250 |
elif atom_allowed and accept == 'application/atom+xml': |
251 |
return 'atom' |
252 |
|
253 |
return 'json' |
254 |
|
255 |
def api_method(http_method=None, atom_allowed=False): |
256 |
"""Decorator function for views that implement an API method."""
|
257 |
|
258 |
def decorator(func): |
259 |
@wraps(func)
|
260 |
def wrapper(request, *args, **kwargs): |
261 |
try:
|
262 |
request.serialization = request_serialization( |
263 |
request, |
264 |
atom_allowed) |
265 |
if not request.user: |
266 |
raise Unauthorized('No user found.') |
267 |
if http_method and request.method != http_method: |
268 |
raise BadRequest('Method not allowed.') |
269 |
|
270 |
resp = func(request, *args, **kwargs) |
271 |
update_response_headers(request, resp) |
272 |
return resp
|
273 |
except VirtualMachine.DeletedError:
|
274 |
fault = BadRequest('Server has been deleted.')
|
275 |
return render_fault(request, fault)
|
276 |
except VirtualMachine.BuildingError:
|
277 |
fault = BuildInProgress('Server is being built.')
|
278 |
return render_fault(request, fault)
|
279 |
except Fault, fault:
|
280 |
return render_fault(request, fault)
|
281 |
except BaseException, e: |
282 |
logging.exception('Unexpected error: %s', e)
|
283 |
fault = ServiceUnavailable('Unexpected error.')
|
284 |
return render_fault(request, fault)
|
285 |
return wrapper
|
286 |
return decorator
|