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pierreprinetti · Aug 13, 2018 · d669a1a · d669a1a
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diff --git a/Dockerfile b/Dockerfile
@@ -0,0 +1,11 @@
+FROM golang:1.11beta3-alpine
+
+# Copy the code from the host and compile it
+WORKDIR $GOPATH/src/play-wasm
+COPY . ./
+RUN GOOS=js GOARCH=wasm go build -o ./serve/play.wasm ./play.go
+RUN GOOS=linux go build -o ./app ./serve/serve.go
+
+EXPOSE 8080
+
+CMD ./app
diff --git a/Makefile b/Makefile
@@ -0,0 +1,6 @@
+
+build:
+	docker build -t play-wasm .
+
+run: build
+	docker run --rm -p 8080:8080 play-wasm
diff --git a/play.go b/play.go
@@ -0,0 +1,25 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"net/http"
+	"syscall/js"
+)
+
+func main() {
+
+	res, err := http.Get("https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS")
+	if err != nil {
+		log.Fatalf("error fetching: %v", err)
+	}
+
+	b, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		log.Fatalf("error parsing the response body: %v", err)
+	}
+
+	document := js.Global().Get("document")
+	p := document.Call("getElementById", "target")
+	p.Set("innerHTML", string(b))
+}
diff --git a/serve/serve.go b/serve/serve.go
@@ -0,0 +1,28 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"strings"
+	"time"
+)
+
+func file(name string) http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		log.Printf("%s %s %s", time.Now().Format(time.RFC3339), req.Method, req.RequestURI)
+		if strings.HasSuffix(name, ".wasm") {
+			rw.Header().Set("Content-Type", "application/wasm")
+		}
+		http.ServeFile(rw, req, name)
+	})
+}
+
+func main() {
+	mux := http.NewServeMux()
+	mux.Handle("/", file("./serve/wasm_exec.html"))
+	mux.Handle("/wasm_exec.js", file("./serve/wasm_exec.js"))
+	mux.Handle("/play.wasm", file("./serve/play.wasm"))
+
+	log.Println("Serving...")
+	log.Fatal(http.ListenAndServe(":8080", mux))
+}
diff --git a/serve/wasm_exec.html b/serve/wasm_exec.html
@@ -0,0 +1,45 @@
+<!doctype html>
+<!--
+Copyright 2018 The Go Authors. All rights reserved.
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file.
+-->
+<html>
+
+<head>
+	<meta charset="utf-8">
+	<title>Go wasm</title>
+</head>
+
+<body>
+	<script src="wasm_exec.js"></script>
+	<script>
+		if (!WebAssembly.instantiateStreaming) { // polyfill
+			WebAssembly.instantiateStreaming = async (resp, importObject) => {
+				const source = await (await resp).arrayBuffer();
+				return await WebAssembly.instantiate(source, importObject);
+			};
+		}
+
+		const go = new Go();
+		let mod, inst;
+		WebAssembly.instantiateStreaming(fetch("play.wasm"), go.importObject).then((result) => {
+			mod = result.module;
+			inst = result.instance;
+			document.getElementById("runButton").disabled = false;
+		});
+
+		async function run() {
+			console.clear();
+			await go.run(inst);
+			inst = await WebAssembly.instantiate(mod, go.importObject); // reset instance
+		}
+	</script>
+
+	<button onClick="run();" id="runButton" disabled>Run</button>
+
+	<p id="target"></p>
+
+</body>
+
+</html>