Commits on Oct 9, 2024

1. add wasm32-wasip2 support …

   This adds support for the new `wasm32-wasip2` target platform, which includes
   more extensive support for sockets than `wasm32-wasip1` (formerly known as
   `wasm32-wasi`).
   
   The bulk of the changes are in tokio-rs/mio#1836.  This
   patch just tweaks a few `cfg` directives to indicate `wasm32-wasip2`'s
   additional capabilities.
   
   In the future, we could consider adding support for `ToSocketAddrs`.  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.
   
   I've tested this end-to-end using https://github.com/dicej/wasi-sockets-tests,
   which includes smoke tests for `mio`, `tokio`, `tokio-postgres`, etc.  I'd also
   be happy to add tests to this repo if appropriate; it would require adding a
   dev-dependency on e.g. `wasmtime` to actually run the test cases.
   
   Signed-off-by: Joel Dice <[email protected]>

   

   dicej committed Oct 9, 2024
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