/
server.py
312 lines (303 loc) · 15.3 KB
/
server.py
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
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
'''
Created on 2015/7/24
:author: hubo
'''
from vlcp.config import Configurable, manager, config
from vlcp.event import Scheduler, DefaultPolling, RoutineControlEvent, CBQueue
from vlcp.utils.connector import Resolver
from vlcp.event import PollEvent, ConnectionWriteEvent, ConnectionControlEvent, StreamDataEvent
from vlcp.event.core import TimerEvent, SystemControlEvent, SystemControlLowPriorityEvent
from vlcp.event.connection import ResolveRequestEvent, ResolveResponseEvent
from vlcp.event.future import FutureEvent
from .module import Module, ModuleLoader, ModuleAPICall, ModuleAPIReply, ModuleNotification, ModuleLoadStateChanged
import logging
import logging.config
from vlcp.event.lock import LockEvent
import os
from vlcp.event.ratelimiter import RateLimitingEvent
@config('server')
class Server(Configurable):
'''
Create a server with all necessary parts
'''
# Startup modules list. Should be a tuple of "package.classname" like::
#
# ('vlcp.service.sdn.viperflow.ViperFlow',
# 'vlcp.service.sdn.vrouterapi.VRouterApi')
#
# Startup modules automatically load their dependencies, so it is not necessary
# (though not an error) to write them explicitly.
#
# If server.startup is null or empty, server tries to load modules
# in __main__.
_default_startup = ()
# enable debugging log for scheduler
_default_debugging = False
# File-can-write event priority, usually means socket send() can be used
_default_pollwritepriority = 700
# ConnectionWrite events priority
_default_connectionwritepriority = 600
# File-can-read event priority, usually means data received from socket
_default_pollreadpriority = 500
# error event priority, usually means the socket is in an error status
_default_pollerrorpriority = 800
# responses from resolver
_default_resolverresppriority = 490
# requests to resolver
_default_resolverreqpriority = 650
# shutdown/reset/restart commands for connections
_default_connectioncontrolpriority = 450
# asynchronously starts a routine
_default_routinecontrolpriority = 1000
# streams (vlcp.event.stream.Stream) data
_default_streamdatapriority = 640
# timers
_default_timerpriority = 900
# a lock can be acquired
_default_lockpriority = 990
# future objects been set
_default_futurepriority = 989
# a module is loaded/unloaded
_default_moduleloadeventpriority = 890
# system high-priority events
_default_sysctlpriority = 2000
# system low-priority events
_default_sysctllowpriority = 10
# module API call
_default_moduleapicallpriority = 630
# module API response
_default_moduleapireplypriority = 420
# module notify
_default_modulenotifypriority = 410
# default connection write queue limit for all connections
_default_totalwritelimit = 100000
# connection write events limit per connection
_default_writelimitperconnection = 5
# preserve space for newly created connections in default connection write queue
_default_preservefornew = 100
# stream data limit for all streams
_default_streamdatalimit = 100000
# stream data limit per stream
_default_datalimitperstream = 5
# the default multi-threading resolver pool size
_default_resolverpoolsize = 64
# try to set open files limit (ulimit -n) to this number if it is smaller
_default_ulimitn = 32768
# Use logging.config.dictConfig with this dictionary to configure the logging system.
# It is supported in Python 2.7+
_default_logging = None
# Use logging.config.fileConfig with this file to configure the logging system.
_default_loggingconfig = None
# Force polling the sockets even if there are still unfinished events after processing
# this number of events. May be helpful for very high stress. Should be set together
# with server.queuemaxsize or/and server.queuedefaultsize to prevent memory overflow.
_default_processevents = None
# Limit the default queue size, so more events will be blocked until some events are
# processed. This further limit the processing speed for producers to keep the system
# stable on very high stress, but may slightly reduce the performance.
_default_queuedefaultsize = None
# Limit the total size of the event queue, so more events will be blocked until some events are
# processed. This further limit the processing speed for producers to keep the system
# stable on very high stress, but may slightly reduce the performance.
_default_queuemaxsize = None
def __init__(self):
'''
Constructor
'''
if hasattr(self, 'logging') and self.logging is not None:
if isinstance(self.logging, dict):
logging_config = dict(self.logging)
else:
logging_config = self.logging.todict()
logging_config.setdefault('disable_existing_loggers', False)
logging.config.dictConfig(logging_config)
elif hasattr(self, 'loggingconfig') and self.loggingconfig is not None:
logging.config.fileConfig(self.loggingconfig, disable_existing_loggers=False)
self.scheduler = Scheduler(DefaultPolling(), getattr(self, 'processevents', None), getattr(self, 'queuedefaultsize', None), getattr(self, 'queuemaxsize', None),
defaultQueueClass=CBQueue.AutoClassQueue.initHelper('_classname0'), defaultQueuePriority = 400)
if self.debugging:
self.scheduler.debugging = True
self.scheduler.logger.setLevel(logging.DEBUG)
self.scheduler.queue.addSubQueue(self.pollwritepriority, PollEvent.createMatcher(category=PollEvent.WRITE_READY), 'write', None, None, CBQueue.AutoClassQueue.initHelper('fileno'))
self.scheduler.queue.addSubQueue(self.pollreadpriority, PollEvent.createMatcher(category=PollEvent.READ_READY), 'read', None, None, CBQueue.AutoClassQueue.initHelper('fileno'))
self.scheduler.queue.addSubQueue(self.pollerrorpriority, PollEvent.createMatcher(category=PollEvent.ERROR), 'error')
self.scheduler.queue.addSubQueue(self.connectioncontrolpriority, ConnectionControlEvent.createMatcher(), 'control')
self.scheduler.queue.addSubQueue(self.connectionwritepriority, ConnectionWriteEvent.createMatcher(), 'connectionwrite', self.totalwritelimit, self.totalwritelimit, CBQueue.AutoClassQueue.initHelper('connection', self.preservefornew, subqueuelimit = self.writelimitperconnection))
self.scheduler.queue.addSubQueue(self.streamdatapriority, StreamDataEvent.createMatcher(), 'streamdata', self.streamdatalimit, self.streamdatalimit, CBQueue.AutoClassQueue.initHelper('stream', self.preservefornew, subqueuelimit = self.datalimitperstream))
self.scheduler.queue.addSubQueue(self.routinecontrolpriority, RoutineControlEvent.createMatcher(), 'routine')
self.scheduler.queue.addSubQueue(self.routinecontrolpriority, RateLimitingEvent.createMatcher(), 'ratelimiting')
self.scheduler.queue.addSubQueue(self.timerpriority, TimerEvent.createMatcher(), 'timer')
self.scheduler.queue.addSubQueue(self.resolverresppriority, ResolveResponseEvent.createMatcher(), 'resolve')
self.scheduler.queue.addSubQueue(self.resolverreqpriority, ResolveRequestEvent.createMatcher(), 'resolvereq', 16)
self.scheduler.queue.addSubQueue(self.sysctlpriority, SystemControlEvent.createMatcher(), 'sysctl')
self.scheduler.queue.addSubQueue(self.sysctllowpriority, SystemControlLowPriorityEvent.createMatcher(), 'sysctllow')
self.scheduler.queue.addSubQueue(self.moduleapicallpriority, ModuleAPICall.createMatcher(), 'moduleapi', None, None, CBQueue.AutoClassQueue.initHelper('target', 2, subqueuelimit = 5))
self.scheduler.queue.addSubQueue(self.moduleapireplypriority, ModuleAPIReply.createMatcher(), 'moduleapireply')
self.scheduler.queue.addSubQueue(self.modulenotifypriority, ModuleNotification.createMatcher(), 'modulenotify', None, None, CBQueue.AutoClassQueue.initHelper('target', subqueuelimit=5))
self.scheduler.queue.addSubQueue(self.moduleloadeventpriority, ModuleLoadStateChanged.createMatcher(), 'moduleload')
self.scheduler.queue.addSubQueue(self.lockpriority, LockEvent.createMatcher(), 'lock', None, None, CBQueue.AutoClassQueue.initHelper('key', subqueuelimit=1))
self.scheduler.queue.addSubQueue(self.futurepriority, FutureEvent.createMatcher(), 'future')
self.resolver = Resolver(self.scheduler, self.resolverpoolsize)
self.moduleloader = ModuleLoader(self)
def serve(self):
"""
Start the server
"""
if self.ulimitn is not None:
try:
import resource
curr_ulimit = resource.getrlimit(resource.RLIMIT_NOFILE)
if curr_ulimit[0] >= self.ulimitn:
# We do not decrease ulimit
pass
elif curr_ulimit[1] >= self.ulimitn:
# Only increase soft limit, keep the hard limit unchanged
resource.setrlimit(resource.RLIMIT_NOFILE, (self.ulimitn, curr_ulimit[1]))
else:
try:
resource.setrlimit(resource.RLIMIT_NOFILE, (self.ulimitn, self.ulimitn))
except Exception:
# Maybe we do not have permission to change hard limit, instead we increase soft limit to the hard limit
resource.setrlimit(resource.RLIMIT_NOFILE, (curr_ulimit[1], curr_ulimit[1]))
except Exception:
pass
# If logging is not configured, configure it to the default (console)
logging.basicConfig()
self.resolver.start()
self.moduleloader.start()
for path in self.startup:
self.moduleloader.subroutine(self.moduleloader.loadByPath(path))
self.scheduler.main()
def main(configpath = None, startup = None, daemon = False, pidfile = None, fork = None):
"""
The most simple way to start the VLCP framework
:param configpath: path of a configuration file to be loaded
:param startup: startup modules list. If None, `server.startup` in the configuration files
is used; if `server.startup` is not configured, any module defined or imported
into __main__ is loaded.
:param daemon: if True, use python-daemon to fork and start at background. `python-daemon` must be
installed::
pip install python-daemon
:param pidfile: if daemon=True, this file is used for the pidfile.
:param fork: use extra fork to start multiple instances
"""
if configpath is not None:
manager.loadfrom(configpath)
if startup is not None:
manager['server.startup'] = startup
if not manager.get('server.startup'):
# No startup modules, try to load from __main__
startup = []
import __main__
for k in dir(__main__):
m = getattr(__main__, k)
if isinstance(m, type) and issubclass(m, Module) and m is not Module:
startup.append('__main__.' + k)
manager['server.startup'] = startup
if fork is not None and fork > 1:
if not hasattr(os, 'fork'):
raise ValueError('Fork is not supported in this operating system.')
def start_process():
s = Server()
s.serve()
def main_process():
if fork is not None and fork > 1:
import multiprocessing
from time import sleep
sub_procs = []
for i in range(0, fork):
p = multiprocessing.Process(target = start_process)
sub_procs.append(p)
for i in range(0, fork):
sub_procs[i].start()
try:
import signal
def except_return(sig, frame):
raise SystemExit
signal.signal(signal.SIGTERM, except_return)
signal.signal(signal.SIGINT, except_return)
if hasattr(signal, 'SIGHUP'):
signal.signal(signal.SIGHUP, except_return)
while True:
sleep(2)
for i in range(0, fork):
if sub_procs[i].is_alive():
break
else:
break
finally:
for i in range(0, fork):
if sub_procs[i].is_alive():
sub_procs[i].terminate()
for i in range(0, fork):
sub_procs[i].join()
else:
start_process()
if daemon:
import daemon
if not pidfile:
pidfile = manager.get('daemon.pidfile')
uid = manager.get('daemon.uid')
gid = manager.get('daemon.gid')
if gid is None:
group = manager.get('daemon.group')
if group is not None:
import grp
gid = grp.getgrnam(group)[2]
if uid is None:
import pwd
user = manager.get('daemon.user')
if user is not None:
user_pw = pwd.getpwnam(user)
uid = user_pw.pw_uid
if gid is None:
gid = user_pw.pw_gid
if uid is not None and gid is None:
import pwd
gid = pwd.getpwuid(uid).pw_gid
if pidfile:
import fcntl
class PidLocker(object):
def __init__(self, path):
self.filepath = path
self.fd = None
def __enter__(self):
# Create pid file
self.fd = os.open(pidfile, os.O_WRONLY | os.O_TRUNC | os.O_CREAT, 0o644)
fcntl.lockf(self.fd, fcntl.LOCK_EX|fcntl.LOCK_NB)
os.write(self.fd, str(os.getpid()).encode('ascii'))
os.fsync(self.fd)
def __exit__(self, typ, val, tb):
if self.fd:
try:
fcntl.lockf(self.fd, fcntl.LOCK_UN)
except Exception:
pass
os.close(self.fd)
self.fd = None
locker = PidLocker(pidfile)
else:
locker = None
import sys
# Module loading is related to current path, add it to sys.path
cwd = os.getcwd()
if cwd not in sys.path:
sys.path.append(cwd)
# Fix path issues on already-loaded modules
for m in sys.modules.values():
if getattr(m, '__path__', None):
m.__path__ = [os.path.abspath(p) for p in m.__path__]
# __file__ is used for module-relative resource locate
if getattr(m, '__file__', None):
m.__file__ = os.path.abspath(m.__file__)
configs = {'gid':gid,'uid':uid,'pidfile':locker}
config_filters = ['chroot_directory', 'working_directory', 'umask', 'detach_process',
'prevent_core']
if hasattr(manager, 'daemon'):
configs.update((k,v) for k,v in manager.daemon.config_value_items() if k in config_filters)
if not hasattr(os, 'initgroups'):
configs['initgroups'] = False
with daemon.DaemonContext(**configs):
main_process()
else:
main_process()