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PODynamic (i.e. Runtime Configurable) Log Configuration for Django + Celery based application
 

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  1. PODynamic (i.e. Runtime Configurable) Log Configuration for Django + Celery based application
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    <p>We have a need to customize the log levels on the server at runtime. We are building a SAAS application using Django, and we have to be able to enable logging per tenant eventually. I am trying to find the best way of doing it. </p> <p>As a first step, I created a way to dynamically change log levels (for the whole application). I see there are no examples of doing it. I am note sure if one one tried something like this so far, and what are the pitfalls I should be watching out for.</p> <p>Here is my code so far. Appreciate if anyone can shed light on specific pitfalls I am going to run into. Also appreciate any input on how to control logging per tenant and module, short of creating logger per tenant per module: </p> <pre><code>import threading import logging.config import time import os import traceback class LogConfigWatcher(threading.Thread): def __init__(self, storage, location): self.last_known_time = None self.storage = storage self.location = location threading.Thread.__init__(self) def run(self): while True: mod_time = os.path.getmtime(self.location) if(mod_time != self.last_known_time): try: with file(self.location) as f: print("Configuring logging . . .") config = eval(f.read()) logging.config.dictConfig(config['handler_config']) logging.config.dictConfig(config['logger_config']) self.last_known_time = mod_time except: traceback.print_exc() print "Failed to Configure the log" pass time.sleep(5) class LogConfigHolder(object): def __init__(self, storage, location): self.storage = storage self.location = location self.initialize(storage, location) def initialize(self, storage, location): self.pid = os.getpid() print "Starting thread for %s" % self.pid self.thread = LogConfigWatcher(storage, location) self.thread.setDaemon(True) self.thread.start() def is_alive(self): if os.getpid() != self.pid: return False return self.thread.isAlive() def restart(self): if not self.is_alive(): self.initialize(self.storage, self.location) </code></pre>
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