forked from sagemath/sagecell
/
kernel_dealer.py
203 lines (174 loc) · 6.96 KB
/
kernel_dealer.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
import time
import jupyter_client.session
import zmq
from log import logger
import misc
config = misc.Config()
class KernelConnection(object):
"""
Kernel from the dealer point of view.
Handles connections over ZMQ sockets to compute kernels.
"""
def __init__(self, dealer, id, connection, lifespan, timeout):
self._on_stop = None
self._dealer = dealer
self.id = id
self.executing = 0
now = time.time()
self.hard_deadline = now + lifespan
self.timeout = timeout
self.deadline = min(now + self.timeout, self.hard_deadline)
self.session = jupyter_client.session.Session(key=connection["key"])
self.channels = {}
context = zmq.Context.instance()
address = connection["ip"]
if ":" in address:
address = "[{}]".format(address)
for channel, socket_type in (
("shell", zmq.DEALER), ("iopub", zmq.SUB), ("hb", zmq.REQ)):
socket = context.socket(socket_type)
socket.connect("tcp://{}:{}".format(address, connection[channel]))
stream = zmq.eventloop.zmqstream.ZMQStream(socket)
stream.channel = channel
self.channels[channel] = stream
self.channels["iopub"].socket.subscribe(b"")
self.start_hb()
logger.debug("KernelConnection initialized")
def on_stop(self, callback):
self._on_stop = callback
def start_hb(self):
logger.debug("start_hb for %s", self.id)
hb = self.channels["hb"]
ioloop = zmq.eventloop.IOLoop.current()
def pong(message):
#logger.debug("pong for %s", self.id)
self._expecting_pong = False
hb.on_recv(pong)
self._expecting_pong = False
def ping():
#logger.debug("ping for %s", self.id)
now = ioloop.time()
if self._expecting_pong:
logger.warning("kernel %s died unexpectedly", self.id)
self.stop()
elif now > self.hard_deadline:
logger.info("hard deadline reached for %s", self.id)
self.stop()
elif now > self.deadline and self.executing == 0:
self.stop()
else:
hb.send(b'ping')
self._expecting_pong = True
self._hb_periodic_callback = zmq.eventloop.ioloop.PeriodicCallback(
ping, config.get("beat_interval") * 1000)
def start_ping():
logger.debug("start_ping for %s", self.id)
if self.alive:
self._hb_periodic_callback.start()
self._start_ping_handle = ioloop.call_later(
config.get("first_beat"), start_ping)
self.alive = True
def stop(self):
logger.debug("stopping kernel %s", self.id)
if not self.alive:
logger.exception("not alive already")
return
if self._on_stop:
self._on_stop()
self.stop_hb()
for stream in self.channels.itervalues():
stream.close()
self._dealer.stop_kernel(self.id)
def stop_hb(self):
logger.debug("stop_hb for %s", self.id)
self.alive = False
self._hb_periodic_callback.stop()
zmq.eventloop.IOLoop.current().remove_timeout(self._start_ping_handle)
self.channels["hb"].on_recv(None)
class KernelDealer(object):
r"""
Kernel Dealer handles compute kernels on the server side.
"""
def __init__(self, provider_settings):
self.provider_settings = provider_settings
self._available_providers = []
self._connected_providers = {} # provider address: last message time
self._expected_kernels = []
self._get_queue = []
self._kernel_origins = {} # id: provider address
self._kernels = {} # id: KernelConnection
context = zmq.Context.instance()
context.IPV6 = 1
socket = context.socket(zmq.ROUTER)
self.port = socket.bind_to_random_port("tcp://*")
# Can configure perhaps interface/IP/port
self._stream = zmq.eventloop.zmqstream.ZMQStream(socket)
self._stream.on_recv(self._recv)
logger.debug("KernelDealer initialized")
def _try_to_get(self):
r"""
Send a get request if possible AND needed.
"""
while self._available_providers and self._get_queue:
self._stream.send(self._available_providers.pop(0), zmq.SNDMORE)
self._stream.send_json(["get", self._get_queue.pop(0)])
logger.debug("sent get request to a provider")
if self._available_providers:
logger.debug("%s available providers are idling",
len(self._available_providers))
if self._get_queue:
logger.debug("%s get requests are waiting for providers",
len(self._get_queue))
def _recv(self, msg):
logger.debug("received %s", msg)
assert len(msg) == 2
addr = msg[0]
self._connected_providers[addr] = time.time()
msg = zmq.utils.jsonapi.loads(msg[1])
if msg == "get settings":
self._stream.send(addr, zmq.SNDMORE)
self._stream.send_json(["settings", self.provider_settings])
elif msg == "ready":
self._available_providers.append(addr)
self._try_to_get()
elif msg[0] == "kernel":
msg = msg[1]
for i, (rlimits, callback) in enumerate(self._expected_kernels):
if rlimits == msg["rlimits"]:
self._kernel_origins[msg["id"]] = addr
self._expected_kernels.pop(i)
callback(msg)
break
def get_kernel(self, callback,
rlimits={}, lifespan=float("inf"), timeout=float("inf")):
def cb(d):
d.pop("rlimits")
d["lifespan"] = lifespan
d["timeout"] = timeout
kernel = KernelConnection(self, **d)
self._kernels[kernel.id] = kernel
logger.debug("tracking %d kernels", len(self._kernels))
logger.info("dealing kernel %s", kernel.id)
callback(kernel)
self._expected_kernels.append((rlimits, cb))
self._get_queue.append(rlimits)
self._try_to_get()
def kernel(self, id):
return self._kernels[id]
def stop(self):
r"""
Stop all kernels and disconnect all providers.
"""
self._stream.stop_on_recv()
for k in self._kernels.values():
k.stop()
for addr in self._connected_providers:
logger.debug("stopping %r", addr)
self._stream.send(addr, zmq.SNDMORE)
self._stream.send_json("disconnect")
self._stream.flush()
def stop_kernel(self, id):
addr = self._kernel_origins.pop(id)
self._stream.send(addr, zmq.SNDMORE)
self._stream.send_json(["stop", id])
self._kernels.pop(id)