AIL-framework/bin/modules/abstract_module.py

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# coding: utf-8
"""
Base Class for AIL Modules
"""
##################################
# Import External packages
##################################
from abc import ABC, abstractmethod
import time
import traceback
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##################################
# Import Project packages
##################################
from pubsublogger import publisher
from Helper import Process
class AbstractModule(ABC):
"""
Abstract Module class
"""
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def __init__(self, module_name=None, queue_name=None, logger_channel='Script'):
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"""
Init Module
module_name: str; set the module name if different from the instance ClassName
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queue_name: str; set the queue name if different from the instance ClassName
logger_channel: str; set the logger channel name, 'Script' by default
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"""
# Module name if provided else instance className
self.module_name = module_name if module_name else self._module_name()
# Module name if provided else instance className
self.queue_name = queue_name if queue_name else self._module_name()
# Init Redis Logger
self.redis_logger = publisher
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# Port of the redis instance used by pubsublogger
self.redis_logger.port = 6380
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# Channel name to publish logs
# # TODO: refactor logging
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# If provided could be a namespaced channel like script:<ModuleName>
self.redis_logger.channel = logger_channel
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# Run module endlessly
self.proceed = True
# Waiting time in secondes between two proccessed messages
self.pending_seconds = 10
# Setup the I/O queues
self.process = Process(self.queue_name)
def get_message(self):
"""
Get message from the Redis Queue (QueueIn)
Input message can change between modules
ex: '<item id>'
"""
return self.process.get_from_set()
def send_message_to_queue(self, message, queue_name=None):
"""
Send message to queue
:param message: message to send in queue
:param queue_name: queue or module name
ex: send_to_queue(item_id, 'Global')
"""
self.process.populate_set_out(message, queue_name)
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def run(self):
"""
Run Module endless process
"""
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# Endless loop processing messages from the input queue
while self.proceed:
# Get one message (ex:item id) from the Redis Queue (QueueIn)
message = self.get_message()
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if message:
try:
# Module processing with the message from the queue
self.compute(message)
except Exception as err:
trace = traceback.format_tb(err.__traceback__)
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self.redis_logger.critical(f"Error in module {self.module_name}: {err}")
self.redis_logger.critical(trace)
print()
print(f"ERROR: {err}")
print(f'MESSAGE: {message}')
print('TRACEBACK:')
for line in trace:
print(line)
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else:
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self.computeNone()
# Wait before next process
self.redis_logger.debug(f"{self.module_name}, waiting for new message, Idling {self.pending_seconds}s")
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time.sleep(self.pending_seconds)
def _module_name(self):
"""
Returns the instance class name (ie. the Module Name)
"""
return self.__class__.__name__
@abstractmethod
def compute(self, message):
"""
Main method of the Module to implement
"""
pass
def computeNone(self):
"""
Method of the Module when there is no message
"""
pass