Use trappable_error_type in WASIp3 sockets (#11373)

This commit updates to using the `trappable_error_type` in bindings
generated for WASIp3 to mirror what happens in WASIp2, removing an extra
`Result<Result<..>>` layer to only have one layer of results.

Author: alexcrichton

crates/wasi/src/p2/network.rs

@@ -1,8 +1,7 @@
-use core::net::SocketAddr;
-
 use crate::p2::bindings::sockets::network::ErrorCode;
 use crate::sockets::SocketAddrCheck;
 use crate::{SocketAddrUse, TrappableError};
+use core::net::SocketAddr;
 
 pub type SocketResult<T> = Result<T, SocketError>;
 

crates/wasi/src/p3/bindings.rs

@@ -96,7 +96,10 @@ mod generated {
             "wasi:cli/terminal-output/terminal-output": crate::p3::cli::TerminalOutput,
             "wasi:sockets/types/tcp-socket": crate::p3::sockets::tcp::TcpSocket,
             "wasi:sockets/types/udp-socket": crate::p3::sockets::udp::UdpSocket,
-        }
+        },
+        trappable_error_type: {
+            "wasi:sockets/types/error-code" => crate::p3::sockets::SocketError,
+        },
     });
 }
 pub use self::generated::LinkOptions;

crates/wasi/src/p3/sockets/host/types/mod.rs

@@ -1,15 +1,17 @@
+use crate::p3::bindings::sockets::types::{ErrorCode, Host};
+use crate::p3::sockets::{SocketError, WasiSockets};
+use crate::sockets::{SocketAddrCheck, SocketAddrUse, WasiSocketsCtxView};
 use core::net::SocketAddr;
-
 use wasmtime::component::Accessor;
 
-use crate::p3::bindings::sockets::types::Host;
-use crate::p3::sockets::WasiSockets;
-use crate::sockets::{SocketAddrCheck, SocketAddrUse, WasiSocketsCtxView};
-
 mod tcp;
 mod udp;
 
-impl Host for WasiSocketsCtxView<'_> {}
+impl Host for WasiSocketsCtxView<'_> {
+    fn convert_error_code(&mut self, error: SocketError) -> anyhow::Result<ErrorCode> {
+        error.downcast()
+    }
+}
 
 fn get_socket_addr_check<T>(store: &Accessor<T, WasiSockets>) -> SocketAddrCheck {
     store.with(|mut view| view.get().ctx.socket_addr_check.clone())