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        "description": "# Simple Memory Cache\n\nA dead simple memory cache to allow a variable to easily be lazy-loaded when needed. \nOnly 43 lines of code and no dependencies.\n\nThis module is used by our SpinHub App (https://www.spinhub.ca) which is currently in development. It allows us to in-memory cache variables for re-use in successful AWS Lambda function executions.\n\n## Use-case 1: Caching responses\n\nA specific use case for us is to cache de JWKS (the JSON Web Key Set) of our Auth0 domain:\n\n```python\n\nimport requests\nfrom simple_memory_cache import GLOBAL_CACHE\n\nAUTH0_DOMAIN = 'mysubdomain.auth0.com'\n\nJWKS_URL = AUTH0_DOMAIN + '/.well-known/jwks.json'\n\njwks_var = GLOBAL_CACHE.MemoryCachedVar('jwks')\n\n@jwks.on_first_access\ndef _retrieve_jwks():\n    return requests.get(JWKS_URL).json()\n\ndef do_something():\n\n    # First call will trigger _retrieve_jwks and store the return value.\n    # If this is called within the same AWS Lambda instance, the global context will still be there\n    # and the value will simply be returned\n    jwks = jwks_var.get() \n\n    try:\n        (validate JWT token w/ jwks)\n    except (ValidationError):\n        # On a validation error, Auth0 recommends to refetch the JWKS in case it changed.\n        # We invalidate the value and get it once again.\n        jwks_var.invalidate()\n        jwks = jwks_var.get()\n        (validate JWT token w/ jwks)\n\n```\n\n## Use-case 2: Specific Implementation for Flask Globals\n\nWe often encounter the case where we wish to set a Flask g member only if it is not set.\nYou can create your own MemoryCachedVar adapted to this case in 5 lines of code:\n\n```python\n\nfrom simple_memory_cache import CachedVar, NO_VALUE_STORED\n\nfrom flask import g, request\n\nclass FlaskGCache(CachedVar):\n    def _get_stored_value(self):\n        return getattr(g, self.name, NO_VALUE_STORED)\n\n    def _set_stored_value(self, value):\n        setattr(g, self.name, value)   \n\n\napp = (...)\n\nuser_var = FlaskGCache('user')\n\n@user_var.on_first_access\ndef retrieve_user_from_request():\n    token = request.headers.get('Authorization', None)\n    # ... Decode token or raise Unauthorized\n    return user\n\n@app.route()\ndef private_route():\n    user = user_var.get() # Authorizes the user once, will raise Unauthorized if unable.\n    # ...\n    user = user_var.get() # Simply returns the value stored in g.user\n\n```\n\n# Creators\n\nCreated by Tack Verification, a company dedicated to reducing operational costs related to hardware systems verification. \nhttps://www.tackv.ca\n\n",
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