♻️ Use github.com/nlepage/go-js-promise

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+  "go.toolsEnvVars": {
+    "GOOS": "js",
+    "GOARCH": "wasm"
+  }
+}

go.mod

@@ -1,3 +1,5 @@
 module github.com/nlepage/go-wasm-http-server
 
 go 1.13
+
+require github.com/nlepage/go-js-promise v1.0.0

go.sum

@@ -0,0 +1,2 @@
+github.com/nlepage/go-js-promise v1.0.0 h1:K7OmJ3+0BgWJ2LfXchg2sI6RDr7AW/KWR8182epFwGQ=
+github.com/nlepage/go-js-promise v1.0.0/go.mod h1:bdOP0wObXu34euibyK39K1hoBCtlgTKXGc56AGflaRo=

promise.go

@@ -1,55 +0,0 @@
-package wasmhttp
-
-import (
-	"syscall/js"
-)
-
-// NewPromise creates a new JavaScript Promise
-func NewPromise() (p js.Value, resolve func(interface{}), reject func(interface{})) {
-	var cbFunc js.Func
-	cbFunc = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		cbFunc.Release()
-
-		resolve = func(value interface{}) {
-			args[0].Invoke(value)
-		}
-
-		reject = func(value interface{}) {
-			args[1].Invoke(value)
-		}
-
-		return js.Undefined()
-	})
-
-	p = js.Global().Get("Promise").New(cbFunc)
-
-	return
-}
-
-// Await waits for the Promise to be resolved and returns the value
-func Await(p js.Value) (js.Value, error) {
-	resCh := make(chan js.Value)
-	var then js.Func
-	then = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		resCh <- args[0]
-		return nil
-	})
-	defer then.Release()
-
-	errCh := make(chan error)
-	var catch js.Func
-	catch = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		errCh <- js.Error{args[0]}
-		return nil
-	})
-	defer catch.Release()
-
-	p.Call("then", then).Call("catch", catch)
-
-	select {
-	case res := <-resCh:
-		return res, nil
-	case err := <-errCh:
-		return js.Undefined(), err
-	}
-}

request.go

@@ -5,11 +5,13 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"syscall/js"
+
+	promise "github.com/nlepage/go-js-promise"
 )
 
 // Request builds and returns the equivalent http.Request
 func Request(r js.Value) *http.Request {
-	jsBody := js.Global().Get("Uint8Array").New(Await(r.Call("arrayBuffer")))
+	jsBody := js.Global().Get("Uint8Array").New(promise.Await(r.Call("arrayBuffer")))
 	body := make([]byte, jsBody.Get("length").Int())
 	js.CopyBytesToGo(body, jsBody)
 

serve.go

@@ -5,6 +5,8 @@ import (
 	"net/http"
 	"strings"
 	"syscall/js"
+
+	promise "github.com/nlepage/go-js-promise"
 )
 
 // Serve serves HTTP requests using handler or http.DefaultServeMux if handler is nil.
@@ -26,7 +28,7 @@ func Serve(handler http.Handler) func() {
 	}
 
 	var cb = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		var resPromise, resolve, reject = NewPromise()
+		var resPromise, resolve, reject = promise.New()
 
 		go func() {
 			defer func() {