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
|
"""
The Redis transport. Stats are pickled and written to
a redis queue
"""
import time
import signal
import platform
import traceback
import threading
import Bcfg2.Options
from Bcfg2.Reporting.Transport.base import TransportBase, TransportError
from Bcfg2.Compat import cPickle
try:
import redis
HAS_REDIS = True
except ImportError:
HAS_REDIS = False
class RedisMessage(object):
"""An rpc message"""
def __init__(self, channel, method, args=[], kwargs=dict()):
self.channel = channel
self.method = method
self.args = args
self.kwargs = kwargs
class RedisTransport(TransportBase):
""" Redis Transport Class """
STATS_KEY = 'bcfg2_statistics'
COMMAND_KEY = 'bcfg2_command'
options = TransportBase.options + [
Bcfg2.Options.Option(
cf=('reporting', 'redis_host'), dest="reporting_redis_host",
default='127.0.0.1', help='Reporting Redis host'),
Bcfg2.Options.Option(
cf=('reporting', 'redis_port'), dest="reporting_redis_port",
default=6379, type=int, help='Reporting Redis port'),
Bcfg2.Options.Option(
cf=('reporting', 'redis_db'), dest="reporting_redis_db",
default=0, type=int, help='Reporting Redis DB')]
def __init__(self):
super(RedisTransport, self).__init__()
self._commands = None
self.logger.error("Warning: RedisTransport is experimental")
if not HAS_REDIS:
self.logger.error("redis python module is not available")
raise TransportError
self._redis = redis.Redis(
host=Bcfg2.Options.setup.reporting_redis_host,
port=Bcfg2.Options.setup.reporting_redis_port,
db=Bcfg2.Options.setup.reporting_redis_db)
def start_monitor(self, collector):
"""Start the monitor. Eventaully start the command thread"""
self._commands = threading.Thread(target=self.monitor_thread,
args=(self._redis, collector))
self._commands.start()
def store(self, hostname, metadata, stats):
"""Store the file to disk"""
try:
payload = cPickle.dumps(dict(hostname=hostname,
metadata=metadata,
stats=stats))
except: # pylint: disable=W0702
msg = "%s: Failed to build interaction object: %s" % \
(self.__class__.__name__,
traceback.format_exc().splitlines()[-1])
self.logger.error(msg)
raise TransportError(msg)
try:
self._redis.rpush(RedisTransport.STATS_KEY, payload)
except redis.RedisError:
self.logger.error("Failed to store interaction for %s: %s" %
(hostname, traceback.format_exc().splitlines()[-1]))
def fetch(self):
"""Fetch the next object"""
try:
payload = self._redis.blpop(RedisTransport.STATS_KEY, timeout=5)
if payload:
return cPickle.loads(payload[1])
except redis.RedisError:
self.logger.error("Failed to fetch an interaction: %s" %
(traceback.format_exc().splitlines()[-1]))
except cPickle.UnpicklingError:
self.logger.error("Failed to unpickle payload: %s" %
traceback.format_exc().splitlines()[-1])
raise TransportError
return None
def shutdown(self):
"""Called at program exit"""
self._redis = None
def rpc(self, method, *args, **kwargs):
"""
Send a command to the queue. Timeout after 10 seconds
"""
pubsub = self._redis.pubsub()
channel = "%s%s" % (platform.node(), int(time.time()))
pubsub.subscribe(channel)
self._redis.rpush(RedisTransport.COMMAND_KEY,
cPickle.dumps(RedisMessage(channel, method, args, kwargs)))
resp = pubsub.listen()
signal.signal(signal.SIGALRM, self.shutdown)
signal.alarm(10)
next(resp) # clear subscribe message
response = next(resp)
pubsub.unsubscribe()
try:
return cPickle.loads(response['data'])
except: # pylint: disable=W0702
msg = "%s: Failed to receive response: %s" % \
(self.__class__.__name__,
traceback.format_exc().splitlines()[-1])
self.logger.error(msg)
return None
def monitor_thread(self, rclient, collector):
"""Watch the COMMAND_KEY queue for rpc commands"""
self.logger.info("Command thread started")
while not collector.terminate.isSet():
try:
payload = rclient.blpop(RedisTransport.COMMAND_KEY, timeout=5)
if not payload:
continue
message = cPickle.loads(payload[1])
if not isinstance(message, RedisMessage):
self.logger.error("Message \"%s\" is not a RedisMessage" %
message)
if not message.method in collector.storage.__class__.__rmi__ or\
not hasattr(collector.storage, message.method):
self.logger.error(
"Unknown method %s called on storage engine %s" %
(message.method, collector.storage.__class__.__name__))
raise TransportError
try:
cls_method = getattr(collector.storage, message.method)
response = cls_method(*message.args, **message.kwargs)
response = cPickle.dumps(response)
except:
self.logger.error("RPC method %s failed: %s" %
(message.method, traceback.format_exc().splitlines()[-1]))
raise TransportError
rclient.publish(message.channel, response)
except redis.RedisError:
self.logger.error("Failed to fetch an interaction: %s" %
(traceback.format_exc().splitlines()[-1]))
except cPickle.UnpicklingError:
self.logger.error("Failed to unpickle payload: %s" %
traceback.format_exc().splitlines()[-1])
except TransportError:
pass
except: # pylint: disable=W0702
self.logger.error("Unhandled exception in command thread: %s" %
traceback.format_exc().splitlines()[-1])
self.logger.info("Command thread shutdown")
|
