-
Notifications
You must be signed in to change notification settings - Fork 1
/
quorum_2.py
243 lines (205 loc) · 10.2 KB
/
quorum_2.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
import logging
import threading
import time
from node_socket import UdpSocket
import json
import random
def thread_exception_handler(args):
logging.error(f"Uncaught exception", exc_info=(args.exc_type, args.exc_value, args.exc_traceback))
class Quorum:
def __init__(self, node_id: int, port: int, neighbors_ports: list, lb_fault_duration: int, is_continue: bool,
heartbeat_duration: float, leader_id_callback , record_preparation_callback, record_queries_callback):
# Initiate Needed Variable
self.port = port
self.neighbors_ports = neighbors_ports
self.new_neighbors_ports = neighbors_ports
self.node_id = node_id
self.heartbeat_duration = heartbeat_duration
self.term = 0
self.vote = {}
self.election_timer = round(random.uniform(lb_fault_duration, lb_fault_duration+4),1)
self.alive_ports = neighbors_ports
self.voter = []
self.iteration = 2
self.role = 'follower'
self.leader_ports = 0
self.logs = {}
self.is_continue = is_continue
self.lb_fault_duration = lb_fault_duration
self.stop_signal = threading.Event()
self.leader_id_callback = leader_id_callback
self.record_queries = record_queries_callback
self.record_preparation = record_preparation_callback
self.thread = None
def reset_timer(self):
# Function to reset timer with new thread every reset
self.election_timer = round(random.uniform(self.lb_fault_duration, self.lb_fault_duration+4),1)
def election_timer_procedure(self):
# Initiate timer for election
start_election_time = 0
end_election_time = 0
while self.timer_thread_flag:
# Run Election Timer per 0.1s
time.sleep(0.1)
self.election_timer = round(self.election_timer - 0.1, 1)
if self.role == "follower":
if self.election_timer == 0.0:
# If not hearing from leader for certain time, be candidate and vote for itself
self.role = 'candidate'
start_election_time = time.monotonic_ns()
self.term += 1
if self.leader_ports != 0:
self.alive_ports.remove(self.leader_ports)
reset_thread = threading.Thread(target=self.reset_timer)
self.iteration += 1
reset_thread.name=f"Thread-{self.iteration}"
reset_thread.start()
self.vote[self.term] = self.node_id
self.voter.append(self.node_id)
# Send message to other nodes to request for vote
for neighbor in self.neighbors_ports:
message = {}
message['sender'] = self.node_id
message['term'] = self.term
message['message'] = 'vote_request'
message['ports'] = self.port
message['sender_port'] = self.port
UdpSocket.send(json.dumps(message),neighbor)
if self.role == "candidate":
if len(self.voter) > len(self.alive_ports)/2:
# If got votes more than half of alive nodes, be leader
self.role = 'leader'
self.leader_id_callback(self.node_id)
self.leader_ports = self.port
reset_thread = threading.Thread(target=self.reset_timer)
self.iteration += 1
end_election_time = time.monotonic_ns()
self.record_preparation(end_election_time - start_election_time)
logging.info(f'Election Duration: {(end_election_time - start_election_time)/1e9}')
reset_thread.name=f"Thread-{self.iteration}"
reset_thread.start()
self.vote = {}
if self.role == 'leader':
# Reset election_timer as long as being a leader
self.election_timer = 0
def sending_procedure(self):
leader_timer = 0.0
while self.send_thread_flag:
if self.role == 'leader':
time.sleep(0.1)
leader_timer = round(leader_timer + 0.1, 1)
if round(leader_timer % self.heartbeat_duration,1) == 0.0:
# Send to all nodes every heartbeat duration
default_port = self.port - self.node_id
for i in range (1,5):
message_dict = {}
message_dict['sender'] = self.node_id
message_dict['term'] = self.term
message_dict['message'] = 'log_request'
message_dict['ports'] = self.port
message_dict['sender_port'] = self.port
message_dict['logs'] = self.logs
UdpSocket.send(json.dumps(message_dict), default_port+i)
else:
leader_timer = 0.0
def receive_log(self, dict_json):
# Function to process log replication
reset_thread = threading.Thread(target=self.reset_timer)
self.iteration += 1
reset_thread.name=f"Thread-{self.iteration}"
reset_thread.start()
self.leader_ports = dict_json['ports']
self.term = dict_json['term']
self.logs = dict_json['logs']
if dict_json['ports'] not in self.alive_ports:
self.alive_ports.append(dict_json['ports'])
# Send return message to the Leader
message_dict={}
message_dict['sender'] = self.node_id
message_dict['term'] = self.term
message_dict['ports'] = self.port
message_dict['message'] = 'log replicated'
UdpSocket.send(json.dumps(message_dict), dict_json['sender_port'])
def listening_procedure(self):
node_socket = UdpSocket(self.port)
while self.listen_thread_flag:
message, address = node_socket.listen()
dict_json = json.loads(message)
if self.role == 'follower':
# Logic if follower get vote request message
if dict_json['message'] == 'vote_request':
if dict_json['term'] > self.term:
self.term = dict_json['term']
message_dict = {}
message_dict['sender'] = self.node_id
message_dict['term'] = self.term
message_dict['ports'] = self.port
message_dict['message'] = 'agree vote'
reset_thread = threading.Thread(target=self.reset_timer)
self.iteration += 1
reset_thread.name=f"Thread-{self.iteration}"
reset_thread.start()
self.vote[dict_json['term']] = dict_json['sender']
UdpSocket.send(json.dumps(message_dict), dict_json['sender_port'])
# Logic if follower get log request message
elif dict_json['message'] == 'log_request':
receive_log_thread = threading.Thread(target=self.receive_log, args=(dict_json,))
receive_log_thread.name="receive_log->election_timer"
receive_log_thread.start()
elif self.role == 'candidate':
# Logic if candidate got agree vote from other follower
if dict_json['message'] == 'agree vote':
self.voter.append(dict_json['sender'])
# Logic if candidate got message from a leader
elif dict_json['message'] == 'log_request':
if dict_json['term'] >= self.term:
self.term = dict_json['term']
self.leader_ports = dict_json['ports']
if dict_json['ports'] not in self.alive_ports:
self.alive_ports.append(dict_json['ports'])
self.role = 'follower'
reset_thread = threading.Thread(target=self.reset_timer)
self.iteration += 1
reset_thread.name=f"Thread-{self.iteration}"
reset_thread.start()
def start(self):
self.timer_thread = threading.Thread(target=self.election_timer_procedure)
self.timer_thread.name="start->election_timer"
self.timer_thread_flag = True
self.timer_thread.start()
self.listen_thread = threading.Thread(target=self.listening_procedure)
self.listen_thread.name="listen_procedure_thread"
self.listen_thread_flag = True
self.listen_thread.start()
self.send_thread = threading.Thread(target=self.sending_procedure)
self.send_thread_flag = True
self.send_thread.start()
def stop(self):
logging.info(f'Node {self.node_id} Stopped')
self.timer_thread_flag = False
self.timer_thread.join()
self.listen_thread_flag = False
self.listen_thread.join()
self.send_thread_flag = False
self.send_thread.join()
self.stop_signal.set()
def read(self,key):
start_time = time.monotonic_ns()
if key not in self.logs.keys():
logging.info(f"Read Query: {key} is not avaiable")
else:
logging.info(f"Read Query: {key} value is {self.logs[key]}")
end_time = time.monotonic_ns()
self.record_queries(end_time-start_time, "read")
logging.info(f'Read Query Duration: {(end_time-start_time)/1e9}')
def write(self, key, value):
start_time = time.monotonic_ns()
self.logs[key] = value
logging.info(f"Write query: {key} saved with value {value}")
end_time = time.monotonic_ns()
self.record_queries(end_time-start_time, "write")
logging.info(f'Write Query Duration: {(end_time-start_time)/1e9}')
def restart(self):
print(f"Node {self.node_id}: Restarted")
self.stop_signal.clear()
threading.Thread(target=self.start).start()