97 lines
3.5 KiB
Python
97 lines
3.5 KiB
Python
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import json
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import logging
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import os
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import aioredis
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import sanic
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from sanic import Sanic
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ENV_VARS = ["REDIS_HOST", "REDIS_PORT",
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"REDIS_MINPOOL", "REDIS_MAXPOOL",
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"REDIS_PASS", "APP_LOGFILE"]
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app = Sanic(name=__name__)
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logger = None
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@app.middleware("request")
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async def attach_db_connectors(request):
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if not hasattr(request.app.config, "REDIS"):
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logger.info("Setting up connection to Redis Cache")
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request.app.config.REDIS = await aioredis.create_pool((app.config.REDIS_HOST, int(app.config.REDIS_PORT)),
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minsize=int(app.config.REDIS_MINPOOL),
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maxsize=int(app.config.REDIS_MAXPOOL),
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password=app.config.REDIS_PASS)
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# Just put the db objects in the request for easier access
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request["redis"] = request.app.config.REDIS
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@app.route("/state/<user_id>", methods=["GET"])
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async def access_state(request, user_id):
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try:
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# Check to see if the value is in cache, if so lets return that
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with await request["redis"] as redis_conn:
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state = await redis_conn.get(user_id, encoding="utf-8")
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if state:
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return sanic.response.json(json.loads(state))
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# Then state object is not in redis
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logger.critical("Unable to find user_data in cache.")
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return sanic.response.HTTPResponse({"msg": "User state not found"}, status=404)
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except aioredis.ProtocolError:
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logger.critical("Unable to connect to state cache")
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return sanic.response.HTTPResponse({"msg": "Internal Server Error"}, status=500)
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@app.route("/state/<user_id>/push", methods=["POST"])
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async def set_state(request, user_id):
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try:
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with await request["redis"] as redis_conn:
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# Set the value in cache to your new value
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await redis_conn.set(user_id, json.dumps(request.json), expire=1800)
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logger.info("Successfully retrieved from cache")
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return sanic.response.HTTPResponse({"msg": "Successfully pushed state to cache"})
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except aioredis.ProtocolError:
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logger.critical("UNable to connect to state cache")
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return sanic.response.HTTPResponse({"msg": "Interal Server Error"}, status=500)
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def configure():
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# Setup environment variables
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env_vars = [os.environ.get(v, None) for v in ENV_VARS]
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if not all(env_vars):
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# Send back environment variables that were not set
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return False, [ENV_VARS[i] for i, flag in env_vars if not flag]
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else:
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app.config.update({k: v for k, v in zip(ENV_VARS, env_vars)})
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setup_logging()
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logging.info("Configuraiton complete")
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return True, []
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def setup_logging():
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logging_format = "[%(asctime)s] %(process)d-%(levelname)s "
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logging_format += "%(module)s::%(funcName)s():l%(lineno)d: "
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logging_format += "%(message)s"
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print(app.config.APP_LOGFILE)
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logging.basicConfig(
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filename=app.config.APP_LOGFILE,
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format=logging_format,
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level=logging.DEBUG
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)
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if __name__ == "__main__":
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result, missing = configure()
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logger = logging.getLogger()
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if result:
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try:
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app.run(host="0.0.0.0", port=8080, debug=True)
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except:
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logger.critical("User killed server. Closing")
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else:
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need_string = ", ".join(missing)
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logger.critical("Unable to start. Missing environment variables [{0}]".format(need_string))
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