add hello example

examples/hello/.gitignore

@@ -0,0 +1 @@
+dist

examples/hello/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	mkdir -p dist
+	tinygo build -o ./dist/app.wasm -target wasm ./...
+
+.PHONY: publish
+publish:
+	wrangler publish

examples/hello/README.md

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+# hello
+
+* This app just returns a message `Hello, world!`.
+* If url param like `?name=syumai`, then a message `Hello, syumai!` will be returned.
+
+## Demo
+
+* https://hello.syumai.workers.dev/
+* https://hello.syumai.workers.dev/?name=syumai

examples/hello/go.mod

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+module github.com/syumai/hello
+
+go 1.18
+
+require github.com/syumai/workers v0.0.0
+
+replace github.com/syumai/workers => ../../

examples/hello/go.sum

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+github.com/syumai/workers v0.1.0 h1:z5QfQR2X+PCKzom7RodpI5J4D5YF7NT7Qwzb9AM9dgY=
+github.com/syumai/workers v0.1.0/go.mod h1:alXIDhTyeTwSzh0ZgQ3cb9HQPyyYfIejupE4Z3efr14=

examples/hello/main.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/syumai/workers"
+)
+
+func main() {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		name := req.URL.Query().Get("name")
+		if name == "" {
+			name = "world"
+		}
+		fmt.Fprintf(w, "Hello, %s!", name)
+	})
+	workers.Serve(handler)
+}

examples/hello/worker.mjs

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+import "../assets/polyfill_performance.js";
+import "../assets/wasm_exec.js";
+import mod from "./dist/app.wasm";
+
+const go = new Go();
+
+const load = WebAssembly.instantiate(mod, go.importObject).then((instance) => {
+  go.run(instance);
+  return instance;
+});
+
+async function processRequest(event) {
+  const req = event.request;
+  await load;
+  return handleRequest(req);
+}
+
+addEventListener("fetch", (event) => {
+  event.respondWith(processRequest(event));
+})

examples/hello/wrangler.toml

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+name = "hello"
+main = "./worker.mjs"
+compatibility_date = "2022-05-13"
+compatibility_flags = [
+    "streams_enable_constructors"
+]
+
+[build]
+command = "make build"