1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
# Copyright (C) 2012-2013 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import json
import logging
from sugar_network import db
from sugar_network.toolkit import coroutine, enforce
AUTHOR_INSYSTEM = 1
AUTHOR_ORIGINAL = 2
AUTHOR_ALL = (AUTHOR_INSYSTEM | AUTHOR_ORIGINAL)
_logger = logging.getLogger('resources.volume')
def _reprcast_authors(value):
if isinstance(value, dict):
for guid, props in value.items():
if 'name' in props:
yield props['name']
else:
yield guid
else:
yield value
class Resource(db.Document):
@db.indexed_property(prefix='RA', typecast=dict, full_text=True,
default={}, reprcast=_reprcast_authors, permissions=db.ACCESS_READ)
def author(self, value):
result = []
for guid, props in sorted(value.items(),
cmp=lambda x, y: cmp(x[1]['order'], y[1]['order'])):
if 'name' in props:
result.append({
'guid': guid,
'name': props['name'],
'role': props['role'],
})
else:
result.append({
'name': guid,
'role': props['role'],
})
return result
@author.setter
def author(self, value):
if not self.request.principal:
return {}
return self._useradd(self.request.principal, AUTHOR_ORIGINAL)
@db.document_command(method='PUT', cmd='useradd',
arguments={'role': db.to_int},
permissions=db.ACCESS_AUTH | db.ACCESS_AUTHOR)
def useradd(self, user, role):
enforce(user, "Argument 'user' is not specified")
self.directory.update(self.guid, author=self._useradd(user, role))
@db.document_command(method='PUT', cmd='userdel',
permissions=db.ACCESS_AUTH | db.ACCESS_AUTHOR)
def userdel(self, user):
enforce(user, "Argument 'user' is not specified")
enforce(user != self.request.principal, 'Cannot remove yourself')
author = self['author']
enforce(user in author, 'No such user')
del author[user]
self.directory.update(self.guid, author=author)
@db.indexed_property(prefix='RL', typecast=[], default=['public'])
def layer(self, value):
return value
@db.indexed_property(prefix='RT', full_text=True, default=[], typecast=[])
def tags(self, value):
return value
def _useradd(self, user, role):
props = {}
if role is None:
role = 0
users = self.volume['user']
if users.exists(user):
props['name'] = users.get(user)['name']
role |= AUTHOR_INSYSTEM
else:
role &= ~AUTHOR_INSYSTEM
props['role'] = role & AUTHOR_ALL
author = self['author'] or {}
if user in author:
author[user].update(props)
else:
if author:
order = max(author.values(), key=lambda x: x['order'])['order']
props['order'] = order + 1
else:
props['order'] = 0
author[user] = props
return author
class Volume(db.Volume):
RESOURCES = (
'sugar_network.resources.artifact',
'sugar_network.resources.comment',
'sugar_network.resources.context',
'sugar_network.resources.implementation',
'sugar_network.resources.notification',
'sugar_network.resources.feedback',
'sugar_network.resources.report',
'sugar_network.resources.review',
'sugar_network.resources.solution',
'sugar_network.resources.user',
)
def __init__(self, root, document_classes=None, lazy_open=False):
if document_classes is None:
document_classes = Volume.RESOURCES
self._populators = coroutine.Pool()
db.Volume.__init__(self, root, document_classes, lazy_open=lazy_open)
def close(self):
self._populators.kill()
db.Volume.close(self)
def notify(self, event):
if event['event'] == 'update' and 'props' in event and \
'deleted' in event['props'].get('layer', []):
event['event'] = 'delete'
del event['props']
db.Volume.notify(self, event)
def _open(self, name, document):
directory = db.Volume._open(self, name, document)
self._populators.spawn(self._populate, directory)
return directory
def _populate(self, directory):
for __ in directory.populate():
coroutine.dispatch()
class Commands(object):
def __init__(self):
self._pooler = _Pooler()
@db.volume_command(method='GET', cmd='subscribe',
mime_type='text/event-stream')
def subscribe(self, request=None, response=None, ping=False, **condition):
"""Subscribe to Server-Sent Events."""
if request is not None and not condition:
condition = request.query
if response is not None:
response.content_type = 'text/event-stream'
response['Cache-Control'] = 'no-cache'
peer = 'anonymous'
if hasattr(request, 'environ'):
peer = request.environ.get('HTTP_SUGAR_USER') or peer
return self._pull_events(peer, ping, condition)
@db.volume_command(method='POST', cmd='broadcast',
mime_type='application/json', permissions=db.ACCESS_LOCAL)
def broadcast(self, event=None, request=None):
if request is not None:
event = request.content
_logger.debug('Publish event: %r', event)
self._pooler.notify_all(event)
coroutine.dispatch()
def _pull_events(self, peer, ping, condition):
_logger.debug('Start pulling events to %s user', peer)
if ping:
# XXX The whole commands' kwargs handling should be redesigned
if 'ping' in condition:
condition.pop('ping')
# If non-greenlet application needs only to initiate
# a subscription and do not stuck in waiting for the first event,
# it should pass `ping` argument to return fake event to unblock
# `GET /?cmd=subscribe` call.
yield 'data: %s\n\n' % json.dumps({'event': 'pong'})
try:
while True:
event = self._pooler.wait()
for key, value in condition.items():
if value.startswith('!'):
if event.get(key) == value[1:]:
break
elif event.get(key) != value:
break
else:
yield 'data: %s\n\n' % json.dumps(event)
finally:
_logger.debug('Stop pulling events to %s user', peer)
class _Pooler(object):
"""One-producer-to-many-consumers events delivery."""
def __init__(self):
self._value = None
self._waiters = 0
self._ready = coroutine.Event()
self._open = coroutine.Event()
self._open.set()
def wait(self):
self._open.wait()
self._waiters += 1
try:
self._ready.wait()
finally:
self._waiters -= 1
if self._waiters == 0:
self._ready.clear()
self._open.set()
return self._value
def notify_all(self, value=None):
self._open.wait()
if not self._waiters:
return
self._open.clear()
self._value = value
self._ready.set()
|
