base_client: Consume sync responses and store the sync token.

src/async_client.rs

@@ -255,6 +255,8 @@ impl AsyncClient {
                 //     cb(room.clone(), Arc::new(event.clone())).await;
                 // }
             }
+
+            client.receive_sync_response(&response);
         }
 
         Ok(response)
@@ -323,4 +325,8 @@ impl AsyncClient {
         let response = self.send(request).await?;
         Ok(response)
     }
+
+    pub fn sync_token(&self) -> Option<String> {
+        self.base_client.read().unwrap().sync_token.clone()
+    }
 }

src/base_client.rs

@@ -232,4 +232,8 @@ impl Client {
         let mut room = self.get_or_create_room(room_id).write().unwrap();
         room.receive_state_event(event)
     }
+
+    pub fn receive_sync_response(&mut self, response: &api::sync::sync_events::Response) {
+        self.sync_token = Some(response.next_batch.clone());
+    }
 }