Custom implementation to add a key_prefix while keeping the existing flow in place.

ring_cache_prefix_extender.py

def get_key(key, env, encoding='utf-8'):
    """
    This method allows adding a prefix to provided key based on the env value.
    """

    is_str = isinstance(key, str)
    if is_str:
        return 'custom_{}_{}'.format(env, key)
    key = key.decode(encoding)
    return 'custom_{}_{}'.format(env, key).encode(encoding)

def custom_compose_key(func, key_encoding=None, key_refactor=None, env='dev'):
    """
    Custom implementation for the `compose_key` method in
    https://github.com/youknowone/ring/blob/0.7.3/ring/func/base.py#L648 to
    allow addition of runtime prefix for cache keys.
    """
    _callable = func.callable
    _ignorable_keys = func.compose_key.ignorable_keys
    _key_prefix = get_key(suggest_key_prefix(_callable, None), env)
    in_memory_storage = hasattr(func.storage, 'in_memory_storage')
    _compose_key = create_key_builder(
        _callable, _key_prefix, _ignorable_keys,
        encoding=key_encoding, key_refactor=key_refactor, in_memory_storage=in_memory_storage
    )
    _compose_key.ignorable_keys = _ignorable_keys

    return _compose_key

# Patching the compose_key method with the custom method

if hasattr(_method_obj, 'compose_key'):
    _method_obj.compose_key = custom_compose_key(_method_obj, env=env)