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mqtt_publisher.py
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import random
import paho.mqtt.client as mqtt
import json
import time
from multiprocessing import Process
import numpy as np
# from tqdm import tqdm
def getRandomNumber(min, max):
return random.uniform(min, max)
def generateMsg(name):
return {
"name": name,
"id": random.randint(10,100),
"temperature": getRandomNumber(18,27),
"humidity": getRandomNumber(50,61)
}
class Publisher(Process):
ps_start_time = 0
clients = 0
def __init__(self, name, pub_id, hostname, pub_buffer, port=1883, topic=None, timeout=60, max_count=10, qos=0, auth=False, uname=None, pwd=None):
try:
Process.__init__(self)
self._buffer = pub_buffer
self._pub_deltas = list()
self._successMsgs = 0
self._failureMsgs = 0
self._name = name
self._id = pub_id
self._hostname = hostname
self._port = port
self._topic = topic
self._timeout = timeout
self._max_msg_count = max_count
self._qos = qos
self._msg = generateMsg,
self._auth = False
self._username = None
self._password = None
if auth:
self._auth = True
self._username = uname
self._password = pwd
self._client = None
self._connected = False
self._running = False
# Timing Constant Fields
self._start_ts = None
self._end_ts = None
self._pub_start_ts = time.time()
self._pub_end_ts = None
self._max_retry_attempts = 10
self._retry_attempts = 0
# self.lock = Lock()
except Exception as error:
self.print_debug('[ERROR] Publisher : {}' .format(error))
def calculateSatistics(self):
try:
mean = round(np.mean(np.array(self._pub_deltas)) * 1000, 6) if len(self._pub_deltas) > 0 else 0
max_duration = max(self._pub_deltas) * 1000 if len(self._pub_deltas) > 0 else 0
min_duration = min(self._pub_deltas) * 1000 if len(self._pub_deltas) > 0 else 0
average = round(np.average(np.array(self._pub_deltas)) * 1000, 6) if len(self._pub_deltas) > 0 else 0
std = round(np.std(np.array(self._pub_deltas)) * 1000, 6) if len(self._pub_deltas) > 0 else 0
bandwidth = round(1000 / (np.mean(np.array(self._pub_deltas)) * 1000), 4) if len(self._pub_deltas) > 0 else 0
return {
'entity': 'publisher',
'name': self._name,
'id': self._id,
'type': 'info',
'msg_mean': mean,
'msg_average': average,
'msg_std': std,
'msg_max': max_duration,
'msg_min': min_duration,
'msg_received': self._successMsgs,
'max_msg_count': self._max_msg_count,
'success-rate': round(self._successMsgs / self._max_msg_count * 100, 3),
'failure-rate': round(self._failureMsgs / self._max_msg_count * 100, 3),
'bandwidth': bandwidth,
'total_duration': self._pub_end_ts,
}
except Exception as error:
self.print_debug('[ERROR] calculateSatistics : {}' .format(error))
def run(self):
# self.print_debug('[DEBUG] Process : {}'.format(current_process().name))
try:
def on_connect(client, userdata, flags, rc):
# self.print_debug('[INFO] client connection with rc : {}' .format(rc))
if rc == 0:
self._connected = True
# self.print_debug('[INFO] client connection ...[OK]')
self._pub_start_ts = time.time()
Publisher.clients += 1
else:
self._connected = False
def on_message(client, userdata, msg):
self.print_debug('[INFO] on_message : {}' .format(client))
def on_publish(client, userdata, mid):
# self.print_debug('[DEBUG] mid:{}' .format(mid))
# self.print_debug('Msg took {} secs' .format(round((time.time() - self._start_ts), 6)))
self._pub_deltas.append(round(time.time() - self._start_ts, 6))
self._start_ts = time.time()
if time.time() - Publisher.ps_start_time < self._timeout:
self._running = True
self._client = mqtt.Client()
self._client.on_connect = on_connect
self._client.on_message = on_message
self._client.on_publish = on_publish
if self._auth:
self._client.username_pw_set(username=self._username, password=self._password)
# self.print_config()
self._client.connect(self._hostname, self._port)
self._client.loop_start()
# self.lock.acquire()
while not self._connected:
if self._retry_attempts <= self._max_retry_attempts and time.time() - Publisher.ps_start_time < self._timeout:
# self.print_debug('[INFO] Waiting for connection ...')
self._retry_attempts += 1
time.sleep(5)
else:
# self._buffer.put({
# 'entity': 'publisher',
# 'name': self._name,
# 'id': self._id,
# 'type': 'error',
# 'code': 430
# })
raise Exception('Retry time exceeded')
# self.lock.release()
for _ in range(self._max_msg_count):
if time.time() - Publisher.ps_start_time <= self._timeout:
msg = generateMsg(self._name)
# self.print_debug('[INFO] counter : {}, msg : {}' .format(i, msg))
# if not self._start_ts:
self._start_ts = time.time()
ret = self._client.publish(self._topic, json.dumps(msg), self._qos)
if ret[0] == 0:
self._successMsgs += 1
elif ret[0] == 1:
self._failureMsgs += 1
# raise Exception('MQTT No Connection')
time.sleep(0.1)
# self.print_debug('[DEBUG] publish_ret : {}' .format(ret))
else:
raise Exception('Publisher Timeout reached !')
self._client.disconnect()
self._pub_end_ts = round(time.time() - self._pub_start_ts, 3)
# self.print_debug('[DEBUG] send {0} messages in {1} seconds' .format(self._max_msg_count, self._pub_end_ts))
self._buffer.put(self.calculateSatistics())
# self.print_debug('[INFO] Publisher Stopped ...[OK]')
except (Exception, KeyboardInterrupt) as error:
# self.print_debug('[ERROR] run {}' .format(error))
if self._connected:
self._client.disconnect()
self._pub_end_ts = round(time.time() - self._pub_start_ts, 3)
# self.print_debug('[DEBUG] send {0} messages in {1} seconds' .format(self._max_msg_count, self._end_time))
self._buffer.put(self.calculateSatistics())
# self._buffer.task_done()
else:
# self.print_debug('[ERROR] Connection Falied')
self._buffer.put({
'entity': 'publisher',
'name': self._name,
'id': self._id,
'type': 'error',
'code': 430
})
def print_debug(self, msg):
print('\r entity : {0}, client : {1}, msg : {2}' .format('publisher', self._id, msg))
def print_config(self):
self.print_debug('[DEBUG] hostname: {}, port: {}, qos: {}' .format(self._hostname, self._port, self._qos))
@property
def getClientName(self):
return self._name