Make sessions async

SQLiteSession is not updated, don't try to use it

telethon/sessions/abstract.py

@@ -79,7 +79,7 @@ class Session(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def get_update_state(self, entity_id):
+    async def get_update_state(self, entity_id):
         """
         Returns the ``UpdateState`` associated with the given `entity_id`.
         If the `entity_id` is 0, it should return the ``UpdateState`` for
@@ -89,7 +89,7 @@ class Session(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def set_update_state(self, entity_id, state):
+    async def set_update_state(self, entity_id, state):
         """
         Sets the given ``UpdateState`` for the specified `entity_id`, which
         should be 0 if the ``UpdateState`` is the "general" state (and not
@@ -98,14 +98,14 @@ class Session(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def close(self):
+    async def close(self):
         """
         Called on client disconnection. Should be used to
         free any used resources. Can be left empty if none.
         """
 
     @abstractmethod
-    def save(self):
+    async def save(self):
         """
         Called whenever important properties change. It should
         make persist the relevant session information to disk.
@@ -113,22 +113,15 @@ class Session(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def delete(self):
+    async def delete(self):
         """
         Called upon client.log_out(). Should delete the stored
         information from disk since it's not valid anymore.
         """
         raise NotImplementedError
 
-    @classmethod
-    def list_sessions(cls):
-        """
-        Lists available sessions. Not used by the library itself.
-        """
-        return []
-
     @abstractmethod
-    def process_entities(self, tlo):
+    async def process_entities(self, tlo):
         """
         Processes the input ``TLObject`` or ``list`` and saves
         whatever information is relevant (e.g., ID or access hash).
@@ -136,7 +129,7 @@ class Session(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def get_input_entity(self, key):
+    async def get_input_entity(self, key):
         """
         Turns the given key into an ``InputPeer`` (e.g. ``InputPeerUser``).
         The library uses this method whenever an ``InputPeer`` is needed
@@ -144,24 +137,3 @@ class Session(ABC):
         to use a cached username to avoid extra RPC).
         """
         raise NotImplementedError
-
-    @abstractmethod
-    def cache_file(self, md5_digest, file_size, instance):
-        """
-        Caches the given file information persistently, so that it
-        doesn't need to be re-uploaded in case the file is used again.
-
-        The ``instance`` will be either an ``InputPhoto`` or ``InputDocument``,
-        both with an ``.id`` and ``.access_hash`` attributes.
-        """
-        raise NotImplementedError
-
-    @abstractmethod
-    def get_file(self, md5_digest, file_size, cls):
-        """
-        Returns an instance of ``cls`` if the ``md5_digest`` and ``file_size``
-        match an existing saved record. The class will either be an
-        ``InputPhoto`` or ``InputDocument``, both with two parameters
-        ``id`` and ``access_hash`` in that order.
-        """
-        raise NotImplementedError