Merge pull request #27 from syumai/resolve-wait-until-promise-explicitly

resolve wait until promise explicitly

README.md

@@ -25,6 +25,10 @@
   - [x] Calling stubs
 * [x] D1 (alpha)
 * [x] Environment variables
+* FetchEvent's [lifecycle methods](https://developers.cloudflare.com/workers/runtime-apis/fetch-event/#lifecycle-methods)
+  - [x] waitUntil
+  - [ ] respondWith
+  - [ ] passThroughOnException
 
 ## Installation
 

cloudflare/fetchevent.go

@@ -0,0 +1,25 @@
+package cloudflare
+
+import (
+	"context"
+	"syscall/js"
+
+	"github.com/syumai/workers/cloudflare/internal/cfruntimecontext"
+	"github.com/syumai/workers/internal/jsutil"
+)
+
+// WaitUntil extends the lifetime of the "fetch" event.
+// It accepts an asynchronous task which the Workers runtime will execute before the handler terminates but without blocking the response.
+// see: https://developers.cloudflare.com/workers/runtime-apis/fetch-event/#waituntil
+func WaitUntil(ctx context.Context, task func()) {
+	executionContext := cfruntimecontext.GetExecutionContext(ctx)
+
+	executionContext.Call("waitUntil", jsutil.NewPromise(js.FuncOf(func(this js.Value, pArgs []js.Value) any {
+		resolve := pArgs[0]
+		go func() {
+			task()
+			resolve.Invoke(js.Undefined())
+		}()
+		return js.Undefined()
+	})))
+}