WebAssembly runtime for wasmer-go

Related tags

WebAssembly gowasmer
Overview

gowasmer

gowasmer

When compiling Go to WebAssembly, the Go compiler assumes the WebAssembly is going to run in a JavaScript environment. Hence a wasm_exec.js file is provided by the Go compiler and must be used. However, WebAssembly can actually run everywhere. So we need to use some hacks to make WebAssembly modules generated by the Go compiler runnable everywhere. And that's where gowasmer is useful.

gowasmer is a port of the wasm_exec.js file, for Go. It assumes the WebAssembly runtime is wasmer-go.

Alternatively, to avoid using gowasmer, you can compile your Go program to WebAssembly with TinyGo as follows:

$ tinygo build -o module.wasm -target wasi .

Usage

See _example directory.

Installation

$ go get github.com/mattn/gowasmer

License

MIT

Author

Yasuhiro Matsumoto (a.k.a. mattn)

Issues
  • doc(readme) Propose a better introduction

    doc(readme) Propose a better introduction

    This patch is a proposal for a new introduction, which I find better: It exposes the problem, and explains the need for gowasmer.

    By the way, good job with the project!

    opened by Hywan 1
  • How do I support 'json.Marshal' 'time.now' 'fmt.xxx' in wasm writen in go

    How do I support 'json.Marshal' 'time.now' 'fmt.xxx' in wasm writen in go

    I add some code in example like bellow:

    package main

import (
	"encoding/json"
	"github.com/mattn/gowasmer/wasmutil"
	"syscall/js"
)

func Add(a, b int) int {
	json.Marshal(123)
	//or time.Now()
	//or fmt.Println()
	return a + b
}

func main() {
	c := make(chan struct{})
	js.Global().Set("Add", js.FuncOf(wasmutil.Wrap(Add)))
	<-c
}

    When I run the example , it panics:

    panic: syscall/js: call of Value.Get on undefined

goroutine 1 [running]:
syscall/js.Value.Get({{}, 0x0, 0x0}, {0x22f97, 0x9})
/home/wanghh/workspace/go1.17.7/src/syscall/js/js.go:299 +0xc
syscall.init()
/home/wanghh/workspace/go1.17.7/src/syscall/fs_js.go:21 +0x12

Process finished with the exit code 2

    So, how do I support 'json.Marshal' 'time.now' 'fmt.xxx' in wasm writen in go ?

    opened by wahaha666 5
Owner
mattn
Long-time Golang user&contributor, Google Dev Expert for Go, and author of many Go tools, Vim plugin author. Windows hacker C#/Java/C/C++
mattn
GitHub Repository
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