Replace werkzeug.contrib.SimpleCache with cachetools (#7, fixes #12)

Pipfile

@@ -2,6 +2,7 @@
 requests = "*"
 pyopenmensa = "*"
 flask = "*"
+cachetools = "*"
 
 [dev-packages]
 pytest = "*"

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "4c66b42d8352700feffd46dae3c934f746212df7e897b570715bd799c3c5f121"
+            "sha256": "475551fbc4e977aa1a4edffb7f8549bf4046075e632ac6908f73e3a7a6e0d6bf"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -16,6 +16,14 @@
         ]
     },
     "default": {
+        "cachetools": {
+            "hashes": [
+                "sha256:1d057645db16ca7fe1f3bd953558897603d6f0b9c51ed9d11eb4d071ec4e2aab",
+                "sha256:de5d88f87781602201cde465d3afe837546663b168e8b39df67411b0bf10cefc"
+            ],
+            "index": "pypi",
+            "version": "==4.1.0"
+        },
         "certifi": {
             "hashes": [
                 "sha256:1d987a998c75633c40847cc966fcf5904906c920a7f17ef374f5aa4282abd304",

stw_potsdam/views.py

@@ -3,9 +3,10 @@
 import os
 import urllib.parse
 
+import cachetools as ct
+
 from flask import Flask, jsonify, make_response, url_for
 from flask.logging import create_logger
-from werkzeug.contrib.cache import SimpleCache
 
 from stw_potsdam import feed
 from stw_potsdam.config import read_canteen_config
@@ -29,7 +30,7 @@ if 'BASE_URL' in os.environ:  # pragma: no cover
     if base_url.path:
         app.config['APPLICATION_ROOT'] = base_url.path
 
-cache = SimpleCache()
+cache = ct.ttl.TTLCache(maxsize=30, ttl=CACHE_TIMEOUT)
 
 
 def canteen_not_found(config, canteen_name):
@@ -40,19 +41,15 @@ def canteen_not_found(config, canteen_name):
     return make_response(message, 404)
 
 
-def get_menu_cached(canteen):
-    params = MenuParams(canteen_id=canteen.id, chash=canteen.chash)
-    menu = cache.get(params)
-    if menu:
-        log.info('Using cached menu for %s', canteen)
-    return menu or get_menu(canteen, params)
+def _menu_params(canteen):
+    return MenuParams(canteen_id=canteen.id, chash=canteen.chash)
 
 
-def get_menu(canteen, params):
+@ct.cached(cache=cache, key=_menu_params)
+def get_menu(canteen):
     log.info('Downloading menu for %s', canteen)
-    menu = download_menu(params)
-    cache.set(params, menu, timeout=CACHE_TIMEOUT)
-    return menu
+    params = _menu_params(canteen)
+    return download_menu(params)
 
 
 def _canteen_feed_xml(xml):
@@ -94,7 +91,7 @@ def canteen_menu_feed(canteen_name):
         return canteen_not_found(config, canteen_name)
 
     canteen = config[canteen_name]
-    menu = get_menu_cached(canteen)
+    menu = get_menu(canteen)
     return canteen_menu_feed_xml(menu)