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Wasm - Hello World via console
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| <!-- /out/index.html --> | |
| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Go Wasm</title> | |
| </head> | |
| <body> | |
| <script src="wasm_exec.js"></script> | |
| <script> | |
| if (WebAssembly) { | |
| // WebAssembly.instantiateStreaming is not currently available in Safari | |
| if (WebAssembly && !WebAssembly.instantiateStreaming) { // polyfill | |
| WebAssembly.instantiateStreaming = async (resp, importObject) => { | |
| const source = await (await resp).arrayBuffer(); | |
| return await WebAssembly.instantiate(source, importObject); | |
| }; | |
| } | |
| const go = new Go(); | |
| WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject).then((res) => { | |
| go.run(res.instance); | |
| }); | |
| } else { | |
| console.log("WebAssembly is not supported in your browser") | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| // +build js,wasm | |
| // /go/main.go | |
| // GOOS=js GOARCH=wasm go build -o out/main.wasm go/main.go | |
| package main | |
| import ( | |
| "fmt" | |
| ) | |
| func main() { | |
| fmt.Println("Hello WASM from Go!") | |
| } |
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| // webServer.go | |
| package main | |
| import ( | |
| "log" | |
| "net/http" | |
| "strings" | |
| ) | |
| const dir = "./out" | |
| // create a handler struct | |
| type HttpHandler struct{} | |
| // implement `ServeHTTP` method on `HttpHandler` struct | |
| func (h HttpHandler) ServeHTTP(res http.ResponseWriter, req *http.Request) { | |
| fs := http.FileServer(http.Dir(dir)) | |
| log.Print("Serving " + dir + " on http://localhost:8080") | |
| res.Header().Add("Cache-Control", "no-cache") | |
| if strings.HasSuffix(req.URL.Path, ".wasm") { | |
| res.Header().Set("content-type", "application/wasm") | |
| } | |
| fs.ServeHTTP(res, req) | |
| } | |
| func main() { | |
| // create a new handler | |
| handler := HttpHandler{} | |
| // listen and serve | |
| http.ListenAndServe(":8080", handler) | |
| } |
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