Go wasm test code

client.go

package main

import (
	"fmt"
	"log"
	"os"

	"github.com/anzx/envelope-compose-go/internal/rpc/wasm/client/gowasmer"
)

func main() {
	wasmBytes, err := os.ReadFile("../server/main.wasm")
	if err != nil {
		log.Fatal(err)
	}

	instance, err := gowasmer.NewInstance(wasmBytes)
	if err != nil {
		log.Fatal(err)
	}

	getFunc := func(name string) func(...any) any {
		f := instance.Get(name).(func([]any) any)
		return func(a ...any) any { return f(a) }
	}

	getch := getFunc("getch")
	sum := getFunc("sum")
	upper := getFunc("upper")

	a, b := 2, 3
	word := "hello"
	fmt.Printf("sum(%#v, %#v) -> %#v\n", a, b, sum(a, b))
	u := upper(word).(string)
	fmt.Printf("len(upper(%#v)) -> 0x%x\n", word, len(u))
	fmt.Printf("upper(%#v) -> %#v\n", word, u)
	fmt.Printf("getch(%#v, %#v) -> %#v\n", word, a, getch(word, a))
}

server.go

package main

import (
	"strings"
	"syscall/js"

	"github.com/mattn/gowasmer/wasmutil"
)

func main() {
	global := js.Global()
	wrap := func(f any) js.Func { return js.FuncOf(wasmutil.Wrap(f)) }
	global.Set("getch", wrap(func(x string, i int) int {
		return int(x[i])
	}))
	global.Set("sum", wrap(func(a, b int) int {
		return a + b
	}))
	global.Set("upper", wrap(func(x string) string {
		return strings.ToUpper(x)
	}))
	<-make(chan struct{})
}