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Description:

redmq 0.2.1

redmq
Redis message queue utils: a simple distributed lock based on redis, a simple message queue based on redis with ack feature.
Install
pip install redmq

Usage Examples
redmq.lock.RedisLock
import redis
from redmq.lock import RedisLock

conn = redis.Redis()
lock_name = "test01_lock"

with RedisLock(conn, lock_name) as locked:
if locked:
pass # do things if acquired the lock
else:
pass # do things if not acquired the lock

redmq.message_queue.MessageQueue
worker.py
import time
import redis
from redmq.message_queue import MessageQueue

conn = redis.Redis()
mq = MessageQueue(conn)
while True:
task = mq.pop_nowait()
if task:
message = task["message"]
mq.acknowledge(task, result_data=message.upper())
else:
time.sleep(0.1)

client.py
import time
import redis
from redmq.message_queue import MessageQueue

conn = redis.Redis()
mq = MessageQueue(conn)
task1 = mq.push("task1")
task_info = None
for _ in range(100):
task_info = mq.get_result_nowait(task1)
if task_info:
break
time.sleep(0.1)
print(task_info["result"])

start worker
python3 worker.py

start client
python3 client.py

client output
test@test redmq % python3.9 client.py
{'error_message': 'OK', 'result_data': 'TASK1', 'success': True, 'error_code': 0}

redmq.message_queue.Consumer
consumer.py
import redis
from redmq import MessageQueue
from redmq import Consumer

def pingpong_handler(msg):
return "pong"

conn = redis.Redis("redis")
mq = MessageQueue(conn)
consumer = Consumer(mq)
consumer.register_handler("debug.pingpong", pingpong_handler)
consumer.start()
consumer.wait()

client.py
import redis
from redmq import MessageQueue

conn = redis.Redis("redis")
mq = MessageQueue(conn)
task = {
"handler": "debug.pingpong",
}
response = mq.pushwait(task)
print(response["result"])

result
test@test redmq % python3 examples/client.py
{'error_message': 'OK', 'result_data': 'pong', 'success': True, 'error_code': 0}

Why NOT using blpop instead of lpop?
We do pop_nowait via LUA script, but redis is NOT allow us to use blpop in LUA script.
Releases
v0.1.0

First release.

v0.1.1

redmq.message_queue.MessageQueue.push takes high_priority parameter. Normal message use FIFO rule, and high_priority message use LIFO rule.

v0.2.0

Add redmq.message_queue.Consumer, redmq.message_queue.RequestsHandler, redmq.message_queue.RequestsConsumer.
Add redmq.schedule.Schedule and redmq.schedule.Scheduler.
Add redmq.lock.RedisLock.renew method.
Extend redmq.lock.RedisLock.acquire to allow the same worker acquire the same lock many times.
Add generic async message queue handler server requests-server.

v0.2.1

redmq.schedule.add_runonce_task, redmq.schedule.add_crontab_task, redmq.schedule.add_interval_task add update paraemter to control if update the schedule by force or not.
Fix redmq.schedule.add_crontab_task timezone problem.
Fix redmq.schedule.add_interval_task rule change problem.