mirror of
https://github.com/tokio-rs/tokio.git
synced 2026-08-26 00:00:16 +02:00
Joel Dice
43134f1e57
Motivation This adds networking support for the `wasm32-wasip2` target platform, which includes more extensive support for sockets than `wasm32-wasip1`. Solution The bulk of the changes are in https://github.com/tokio-rs/mio/pull/1931. This patch mainly tweaks a few `cfg` directives to indicate `wasm32-wasip2`'s additional capabilities. Note that this is a draft PR until until https://github.com/tokio-rs/mio/pull/1931 and https://github.com/rust-lang/socket2/pull/639 have been include in stable releases of their respective projects. Also note that I've added a `wasm32-wasip2` target to CI and triaged each test which was previously disabled for WASI into one of three categories: - Disabled on both WASIp1 and p2 due to not-yet-supported features such as multithreading - Disabled on p1 but enabled on p2 - Disabled on p1 and _temporarily_ disabled on p2 due to `wasi-libc` bugfixes which have been merged but not yet included in a Rust release. I'll open an issue to re-enable them when the fixes land in Rust. Future Work In the future, we could consider adding support for `tokio::net::lookup_host`. WASIp2 natively supports asynchronous DNS lookups and is single threaded, whereas Tokio currently assumes DNS lookups are blocking and require multithreading to emulate async lookups. A WASIp2-specific implementation could do the lookup directly without multithreading. WASIp2 also supports single-threaded, asynchronous file I/O, timers, etc. We could either support those directly or wait for WASIp3's multithreading support, in which case most of `tokio::fs` (as well as `tokio::net::lookup_host`, etc.) _should_ work unchanged via `wasi-libc` and worker threads. Currently, building for WASIp2 requires RUSTFLAGS="--cfg tokio_unstable"`. Once we have a solid maintenance plan, we can remove that requirement.
24 lines
564 B
Rust
24 lines
564 B
Rust
#![warn(rust_2018_idioms)]
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// WASIp1 doesn't support bind
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// No `socket` on miri.
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#![cfg(all(
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feature = "net",
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feature = "macros",
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feature = "rt",
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feature = "io-util",
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not(all(target_os = "wasi", target_env = "p1")),
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not(miri)
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))]
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use tokio::net::TcpListener;
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use std::net;
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#[test]
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#[should_panic]
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#[cfg_attr(miri, ignore)] // No `socket` in miri.
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fn no_runtime_panics_binding_net_tcp_listener() {
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let listener = net::TcpListener::bind("127.0.0.1:0").expect("failed to bind listener");
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let _ = TcpListener::try_from(listener);
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}
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