Merge pull request #10 from syumai/add-env

add Getenv helper function

README.md

@@ -22,7 +22,7 @@
   - [ ] Options for KV methods
 * [ ] Cache API
 * [ ] Durable Objects
-* [ ] environment variables (WIP)
+* [x] Environment variables
 
 ## Installation
 

env.go

@@ -0,0 +1,8 @@
+package workers
+
+// Getenv gets an environment variable set to global object.
+// * https://developers.cloudflare.com/workers/platform/environment-variables/
+// * Technically, this function is just an alias for js.Global().Get(env_name).
+func Getenv(name string) string {
+	return global.Get(name).String()
+}

examples/env/.gitignore

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

examples/env/Makefile

@@ -0,0 +1,12 @@
+.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/env/README.md

@@ -0,0 +1,32 @@
+# env
+
+* This app returns a message set as `MY_ENV` in wrangler.toml.
+
+## Demo
+
+* https://env.syumai.workers.dev/
+
+## Development
+
+### Requirements
+
+This project requires these tools to be installed globally.
+
+* wrangler
+* tinygo
+
+### Commands
+
+```
+make dev     # run dev server
+make build   # build Go Wasm binary
+make publish # publish worker
+```
+
+## Author
+
+syumai
+
+## License
+
+MIT

examples/env/go.mod

@@ -0,0 +1,7 @@
+module github.com/syumai/workers/examples/env
+
+go 1.18
+
+require github.com/syumai/workers v0.0.0
+
+replace github.com/syumai/workers => ../../

examples/env/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/syumai/workers"
+)
+
+func main() {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		fmt.Fprintf(w, "MY_ENV: %s", workers.Getenv("MY_ENV"))
+	})
+	workers.Serve(handler)
+}

examples/env/worker.mjs

@@ -0,0 +1,20 @@
+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/env/wrangler.toml

@@ -0,0 +1,14 @@
+name = "env"
+main = "./worker.mjs"
+compatibility_date = "2022-05-13"
+compatibility_flags = [
+    "streams_enable_constructors"
+]
+
+[build]
+command = "make build"
+
+# declare environment variables and assign values
+# https://developers.cloudflare.com/workers/platform/environment-variables/
+[vars]
+MY_ENV = 'my env value'