Merge pull request #35 from dicej/multiple-sdks

support combining SDKs with multiple WIT worlds

Author: asteurer

.github/workflows/pr.yaml

@@ -36,6 +36,6 @@ jobs:
           go-version: 'stable'
       - uses: bytecodealliance/actions/wasmtime/setup@v1
         with:
-          version: "40.0.2"
+          version: "43.0.0"
       - run: rustup update stable --no-self-update && rustup default stable
       - run: cargo test --workspace

Cargo.lock

@@ -37,7 +37,8 @@ allow_attributes_without_reason = 'warn'
 anyhow = { workspace = true}
 clap = { version = "4.5.60", features = ["derive"] }
 regex = "1.12.3"
-wat = { version = "1.245.1"}
+serde = { version = "1.0.228", features = ["derive"] }
+toml = "1.1.0"
 wit-bindgen-go = { git = "https://github.com/bytecodealliance/wit-bindgen", rev = "3ee9fe20a5bce398360d5d291e81a4224a6d7c76" }
 wit-component = "0.245.1"
 wit-parser = "0.245.1"

Cargo.toml

@@ -0,0 +1,61 @@
+package export_wasi_http_handler
+
+import (
+	. "wit_component/wasi_http_types"
+
+	. "go.bytecodealliance.org/pkg/wit/types"
+)
+
+// Handle the specified `Request`, returning a `Response`
+func Handle(request *Request) Result[*Response, ErrorCode] {
+	method := request.GetMethod().Tag()
+	path := request.GetPathWithQuery().SomeOr("/")
+
+	if method == MethodGet && path == "/hello" {
+		// Say hello!
+
+		tx, rx := MakeStreamU8()
+
+		go func() {
+			defer tx.Drop()
+			tx.WriteAll([]uint8("Hello, world!"))
+		}()
+
+		response, send := ResponseNew(
+			FieldsFromList([]Tuple2[string, []byte]{
+				{F0: "content-type", F1: []byte("text/plain")},
+			}).Ok(),
+			Some(rx),
+			trailersFuture(),
+		)
+		send.Drop()
+
+		return Ok[*Response, ErrorCode](response)
+
+	} else {
+		// Bad request
+
+		response, send := ResponseNew(
+			MakeFields(),
+			None[*StreamReader[uint8]](),
+			trailersFuture(),
+		)
+		send.Drop()
+		response.SetStatusCode(400).Ok()
+
+		return Ok[*Response, ErrorCode](response)
+
+	}
+}
+
+func trailersFuture() *FutureReader[Result[Option[*Fields], ErrorCode]] {
+	tx, rx := MakeFutureResultOptionFieldsErrorCode()
+	go tx.Write(Ok[Option[*Fields], ErrorCode](None[*Fields]()))
+	return rx
+}
+
+func unitFuture() *FutureReader[Result[Unit, ErrorCode]] {
+	tx, rx := MakeFutureResultUnitErrorCode()
+	go tx.Write(Ok[Unit, ErrorCode](Unit{}))
+	return rx
+}

examples/multiple-worlds/export_wasi_http_handler/handler.go

@@ -0,0 +1,3 @@
+package export_wit_world
+
+func Foo() {}