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publisher_ex.py
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publisher_ex.py
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#!/usr/bin/env python3
import argparse
import math
import os
import redis
import signal
import sys
import time
import json
#
# NOTE FOR REDIS CONNECTION
# If redis connection requires a password, proceed as follows:
#
# 1) edit `/etc/environment` to add "REDIS_URL=redis://:<password>@127.0.0.1:6379/0"
# 2) if this script is execute via supervisor, instruct it to load `/etc/environment`;
# for example (with systemd):
#
# $ systemctl edit --full supervisor.service
# [Service]
# EnvironmentFile=/etc/environment
#
def main():
# Parse arguments
parser = argparse.ArgumentParser(description='Publish a sinewave on specified redis channel')
parser.add_argument('-r', '--redis-url', help='Example: "redis://[:password@]127.0.0.1:6379/0"')
parser.add_argument('-c', '--channel', default='sinewave')
parser.add_argument('-s', '--sleep_time', type=int, default=100, help="expressed in [ms]; default = 100")
parser.add_argument('-j', '--json', action='store_true', default=False, help="Send rich data (value + timestamp)")
args = parser.parse_args()
# Retrieve redis_url and channel for connection
redis_url = args.redis_url if args.redis_url else os.environ.get('REDIS_URL', 'redis://localhost:6379/0')
channel = args.channel
dt = float(args.sleep_time) / 1000.0
n = 0
connection = connect(redis_url)
while True:
try:
value = 30 + int(30 * math.sin(n / 4))
if not args.json:
# Examples: 'XXXXXXXX'
data = 'X' * value
else:
# Example: '{"timestamp": 1554441334.941386, "values": [55, 38, 3]}'
data = json.dumps({
'timestamp': time.time(),
'values': [
value,
20 + int(20 * math.sin(n / 2)),
10 + int(10 * math.sin(n / 1)),
],
})
connection.publish(channel, data)
print('\x1b[1;36;40m' + data + '\x1b[0m')
n += 1
except (redis.exceptions.ConnectionError, redis.exceptions.ResponseError):
print('Lost connections to redis.')
connection = connect(redis_url)
except Exception as e:
print(str(e))
time.sleep(1)
finally:
time.sleep(dt)
def connect(redis_url):
while True:
print('Trying to connect to redis at "%s" ...' % redis_url)
try:
connection = redis.StrictRedis.from_url(redis_url, decode_responses=True)
connection.ping()
except (redis.exceptions.ConnectionError, redis.exceptions.ResponseError):
time.sleep(1)
else:
break
print('Connected to redis at "%s".' % redis_url)
return connection
if __name__ == "__main__":
signal.signal(signal.SIGINT, lambda signum, frame: sys.exit(0))
main()