Integration of deezloader provider by ParadoxalManiak under CC BY-NC-SA 4.0

Integration of aria2 downloader by Xyne under GPLv2

I'm not responsible of any kind for the usage of this programs by other people.
These integrations come with no warranty.
Please refer to your local country laws and respect Deezer's terms of service.

headphones/classes.py

@@ -21,6 +21,7 @@
 import urllib
 
 from common import USER_AGENT
+from collections import OrderedDict
 
 
 class HeadphonesURLopener(urllib.FancyURLopener):
@@ -135,3 +136,33 @@ class Proper:
     def __str__(self):
         return str(self.date) + " " + self.name + " " + str(self.season) + "x" + str(
             self.episode) + " of " + str(self.tvdbid)
+
+
+class OptionalImport(object):
+    '''
+    Dummy class for optional import (imports needed for optional features).
+    '''
+    def __init__(self, name):
+        self.__name = name
+
+    def __getattr__(self, attr):
+        raise ImportError('The following package is required to use this feature: {0}'.format(self.__name))
+
+
+class CacheDict(OrderedDict):
+    '''
+    Ordered dictionary with fixed size, designed for caching.
+    '''
+    def __init__(self, *args, **kwds):
+        self.size_limit = kwds.pop("size_limit", None)
+        OrderedDict.__init__(self, *args, **kwds)
+        self._check_size_limit()
+
+    def __setitem__(self, key, value):
+        OrderedDict.__setitem__(self, key, value)
+        self._check_size_limit()
+
+    def _check_size_limit(self):
+        if self.size_limit is not None:
+            while len(self) > self.size_limit:
+                self.popitem(last=False)