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Error: Thread panicked, must be called from the context of Tokio runtime #2314

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ibraheemdev opened this issue Oct 27, 2020 · 5 comments
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Error: Thread panicked, must be called from the context of Tokio runtime #2314

ibraheemdev opened this issue Oct 27, 2020 · 5 comments

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@ibraheemdev
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ibraheemdev commented Oct 27, 2020 •
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Running the simple example from hyper.rs:

async fn handle(_: Request<Body>) -> Result<Response<Body>, Infallible> {
    Ok(Response::new("Hello, World!".into()))
}

#[tokio::main]
async fn main() {
    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
    let make_svc = make_service_fn(|_conn| async {
        Ok::<_, Infallible>(service_fn(handle))
    });
    let server = Server::bind(&addr).serve(make_svc);
    if let Err(e) = server.await {
        eprintln!("server error: {}", e);
    }
}

Causes a panic:

thread 'main' panicked at 'there is no reactor running, must be called from the context of Tokio runtime', /Users/user/.cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/tokio-0.2.22/src/io/driver/mod.rs:202:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Running other examples like mini-redis is totally fine. I suspect this has something to do with the tokio-0.2.22 dependency of h2 and hyper.

Environment

$ rustc -V
=> rustc 1.46.0 (04488afe3 2020-08-24)

OS: macOS Catalina 10.15.7

[dependencies]
hyper = "0.13.8"
tokio = { version = "0.3.1", features = ["full"] }
@ibraheemdev ibraheemdev changed the title Error: thread 'main' panicked at 'there is no reactor running, must be called from the context of Tokio runtime' Error: Thread panicked, must be called from the context of Tokio runtime Oct 27, 2020
@davidbarsky
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I suspect this has something to do with the tokio-0.2.22 dependency of h2 and hyper.

Your hunch is correct. You can work around using Tokio 0.2 or use Tokio 0.3 with tokio-compat-02.

@ibraheemdev
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ibraheemdev commented Oct 27, 2020 •
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@davidbarsky So hyper is unusable right now with tokio 0.3 until #2302 is complete?

@sfackler
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It is usable with the version of tokio it is developed against.

@davidbarsky
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Hyper 0.13 depends on Tokio 0.2. You can use Hyper 0.13 with Tokio 0.3 if you use the provided compatibility library, tokio-compat-02. If you don't to use tokio-compat-02, you'll need to wait until #2302 is complete.

@ibraheemdev
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Ok, got it, thanks

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@sfackler @davidbarsky @ibraheemdev