Switch to use decorator for checking if redis server is up.

- setup.py removed empty line flake8 was complaining.

setup.py

@@ -36,4 +36,3 @@ setup(
     ],
     zip_safe=False,
 )
-

snappass/main.py

@@ -3,7 +3,7 @@ import sys
 import uuid
 
 import redis
-from redis.exceptions import ConnectionError
+from redis.exceptions import ConnectionError, TimeoutError
 
 from flask import abort, Flask, render_template, request
 
@@ -23,27 +23,31 @@ time_conversion = {
     'hour': 3600
 }
 
-def check_redis_alive(force_exit=False):
+
+def check_redis_alive(fn):
+    def inner(*args, **kwargs):
         try:
             redis_client.ping()
         except (ConnectionError, TimeoutError) as e:
-        if force_exit:
             print(e)
+            if fn.__name__ == "main":
                 sys.exit(0)
             else:
-            abort(500)
+                return abort(500)
+        return fn(*args, **kwargs)
+    return inner
 
 
+@check_redis_alive
 def set_password(password, ttl):
-    check_redis_alive()
     key = uuid.uuid4().hex
     redis_client.set(key, password)
     redis_client.expire(key, ttl)
     return key
 
 
+@check_redis_alive
 def get_password(key):
-    check_redis_alive()
     password = redis_client.get(key)
     if password is not None:
         password = password.decode('utf-8')
@@ -96,8 +100,8 @@ def show_password(password_key):
     return render_template('password.html', password=password)
 
 
+@check_redis_alive
 def main():
-    check_redis_alive(force_exit=True)
     app.run(host='0.0.0.0', debug=True)