async-rt 0.2.0

A small library designed to utilize async executors through an common API while extending features.
Documentation 
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mod executor;

pub use crate::global::executor::{BuiltinExecutor, DefaultExecutor};
use crate::{Executor, ExecutorBlockOn, ExecutorBlocking, ExecutorTimeout, JoinHandle};
use std::fmt::Debug;

pub struct ConfiguredExecutor<E = DefaultExecutor> {
    executor: E,
    task_executor: Option<BuiltinExecutor>,
}

impl<E: Default> Default for ConfiguredExecutor<E> {
    fn default() -> Self {
        Self {
            executor: E::default(),
            task_executor: None,
        }
    }
}

impl<E: Clone> Clone for ConfiguredExecutor<E> {
    fn clone(&self) -> Self {
        Self {
            executor: self.executor.clone(),
            task_executor: self.task_executor,
        }
    }
}

impl<E: Debug> Debug for ConfiguredExecutor<E> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("ConfiguredExecutor")
            .field("executor", &self.executor)
            .field("task_executor", &self.task_executor)
            .finish()
    }
}

impl<E> ConfiguredExecutor<E> {
    pub fn new(executor: E) -> Self {
        Self {
            executor,
            task_executor: None,
        }
    }

    pub fn with_task_executor(executor: E, task_executor: BuiltinExecutor) -> Self {
        Self {
            executor,
            task_executor: Some(task_executor),
        }
    }

    pub fn executor(&self) -> &E {
        &self.executor
    }

    pub fn task_executor(&self) -> Option<BuiltinExecutor> {
        self.task_executor
    }

    pub fn into_executor(self) -> E {
        self.executor
    }
}

impl<E: Executor> Executor for ConfiguredExecutor<E> {
    fn runtime_type(&self) -> Option<&'static str> {
        self.executor.runtime_type()
    }

    fn spawn<F>(&self, future: F) -> JoinHandle<F::Output>
    where
        F: Future + Send + 'static,
        F::Output: Send + 'static,
    {
        self.executor.spawn(future)
    }
}

impl<E: ExecutorTimeout> ExecutorTimeout for ConfiguredExecutor<E> {}
impl<E: ExecutorBlocking> ExecutorBlocking for ConfiguredExecutor<E> {
    fn spawn_blocking<F, R>(&self, f: F) -> JoinHandle<R>
    where
        F: FnOnce() -> R + Send + 'static,
        R: Send + 'static,
    {
        self.executor.spawn_blocking(f)
    }
}

impl<E: ExecutorBlockOn> ExecutorBlockOn for ConfiguredExecutor<E> {
    fn block_on<F: Future>(&self, future: F) -> F::Output {
        let _guard = self.task_executor.map(crate::task::set_executor);
        self.executor.block_on(future)
    }
}