Function block_on 

pub fn block_on<Fut>(future: Fut) -> Fut::Output
where
    Fut: Future + Send + 'static,
    Fut::Output: Send + 'static,

Blocks on future.

IO & time related Futures must be handled within their own Context. Wait for the result using a JoinHandle or a channel.

The current thread is blocking and the passed in future is executed.

Panics

This function panics if called within a Context thread.