forked from platypush/platypush
284e0638f8
Reverted the previous retry logic for backend - it didn't really work This reverts commit4e0e4863a0. This reverts commit964c7b5cf0. This reverts commit6ce348365f.
76 lines
2.1 KiB
Python
76 lines
2.1 KiB
Python
import json
|
|
|
|
from redis import Redis
|
|
|
|
from platypush.backend import Backend
|
|
from platypush.message import Message
|
|
|
|
|
|
class RedisBackend(Backend):
|
|
"""
|
|
Backend that reads messages from a configured Redis queue (default:
|
|
``platypush_bus_mq``) and posts them to the application bus. Very
|
|
useful when you have plugin whose code is executed in another process
|
|
and can't post events or requests to the application bus.
|
|
|
|
Requires:
|
|
|
|
* **redis** (``pip install redis``)
|
|
"""
|
|
|
|
def __init__(self, queue='platypush_bus_mq', redis_args={}, *args, **kwargs):
|
|
"""
|
|
:param queue: Queue name to listen on (default: ``platypush_bus_mq``)
|
|
:type queue: str
|
|
|
|
:param redis_args: Arguments that will be passed to the redis-py constructor (e.g. host, port, password), see http://redis-py.readthedocs.io/en/latest/
|
|
:type redis_args: dict
|
|
"""
|
|
|
|
super().__init__(*args, **kwargs)
|
|
|
|
self.queue = queue
|
|
self.redis_args = redis_args
|
|
self.redis = Redis(**self.redis_args)
|
|
|
|
|
|
def send_message(self, msg, queue_name=None):
|
|
if queue_name:
|
|
self.redis.rpush(queue_name, msg)
|
|
else:
|
|
self.redis.rpush(self.queue, msg)
|
|
|
|
|
|
def get_message(self, queue_name=None):
|
|
queue = queue_name or self.queue
|
|
msg = self.redis.blpop(queue)[1].decode('utf-8')
|
|
|
|
try:
|
|
msg = Message.build(json.loads(msg))
|
|
except:
|
|
try:
|
|
import ast
|
|
msg = Message.build(ast.literal_eval(msg))
|
|
except:
|
|
try:
|
|
msg = json.loads(msg)
|
|
except Exception as e:
|
|
self.logger.exception(e)
|
|
|
|
return msg
|
|
|
|
|
|
def run(self):
|
|
super().run()
|
|
|
|
self.logger.info('Initialized Redis backend on queue {} with arguments {}'.
|
|
format(self.queue, self.redis_args))
|
|
|
|
while not self.should_stop():
|
|
msg = self.get_message()
|
|
self.logger.info('Received message on the Redis backend: {}'.format(msg))
|
|
self.on_message(msg)
|
|
|
|
|
|
# vim:sw=4:ts=4:et:
|
|
|