Examples for integration with tokio

[dylanede]

I have an existing crate built upon tokio that I want to use within a web server. It makes heavy use of tokio timers and spawn. There don't appear to be any examples in actix-web of how to integrate tokio-based code with the tokio event loops underpinning actix. I'm also not sure how I would go about getting a reactor handle to call spawn on in actix-web.

[ms-ati]

Yes! Same question, specifically for making AWS calls via the Rusoto crate, which is based on Tokio reactor as well. How can we get to run on same reactor as the Actix server?

[fafhrd91]

maybe you can get handle Arbiter::handle() and convert it to tokio handle?

as I understand Rusoto uses hyper 0.11, which is tokio-core based. Arbiter::handle() is tokio-core'a handle

[fafhrd91]

I will migrate actix to Tokio in next version. actix 0.6 and actix-web 0.7

[nayato]

@fafhrd91 is it there already in terms of maturity / stability / tuning to make the switch?

[fafhrd91]

@nayato I don’t know. But I hope with local executor we won’t loose performance. On other hand we should get some boost with simd in 1.27

[nayato]

@fafhrd91 I don't think there's anything magic about SIMD support. That is unless it is explicitly employed in HTTP parsing, unmasking WS payload, etc. Am I missing smth? :)

[fafhrd91]

you are not, but with stable simd we can start using simd :)

[vmalloc]

I'm also interested in examples on how to integrate tokio (especially tokio-proto) with actix and actix-web. If anyone has pointers or working examples that would be greatly appreciated

[fafhrd91]

for current stable 0.6 release only way to integration with tokio-core is Handle.
Handle is available from arbiter Arbiter::handler()

master uses tokio, so tokio::spawn() and Handle::default() should be enough.

[rocallahan]

Unfortunately mixing actix-web 0.7 and old-tokio (tokio-core) crates is very hard because old/new-tokio interop depends on constructing a tokio_core::reactor::Core, getting a tokio_core::reactor::Handle and calling new_tokio_handle() on it to get a tokio::reactor::Handle. But as far as I can tell you can't start actix with just a tokio::reactor::Handle.

[DoumanAsh]

You're not supposed to mix old tokio at all, it would be the best to get rid of it

[rocallahan]

Sure. Unfortunately, a lot of existing crates haven't been updated to new tokio yet.

[DoumanAsh]

Maybe it is sad that these libraries are abandoned but no one has plans for actix to support tokio-core precisely because it is deprecated.

[rocallahan]

Yeah, that's fine.

[timglabisch]

is it fine to run actix and another tokio runtime side by side? i dont want to mix them.

[fafhrd91]

pretty obvious https://docs.rs/actix-rt/1.0.0/actix_rt/struct.System.html#method.run_in_tokio

[thangchung]

I have seen that with new actix-web, we have actix_web::rt::System::with_tokio_rt to run the tokio runtime. But I haven't found any example for how to use it. Could anyone give us an example to use actix-web with tokie?

[robjtede]

See #1283.