From 0f4b067e7a5a911624d38303cf8d0d41ac3d9a38 Mon Sep 17 00:00:00 2001
From: Jono Wenger <jono@elixxir.io>
Date: Wed, 19 Oct 2022 14:39:45 -0700
Subject: [PATCH] Add Await, which allows Go to wait for Javascript promises
---
utils/utils.go | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/utils/utils.go b/utils/utils.go
index e1d3d1c4..07b9782d 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -71,3 +71,32 @@ func CreatePromise(f PromiseFn) interface{} {
// Create and return the Promise object
return Promise.New(handler)
}
+
+// Await waits on a Javascript value. It returns the results of the then and
+// catch functions once it resolves.
+func Await(awaitable js.Value) ([]js.Value, []js.Value) {
+ then := make(chan []js.Value)
+ defer close(then)
+ thenFunc := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+ then <- args
+ return nil
+ })
+ defer thenFunc.Release()
+
+ catch := make(chan []js.Value)
+ defer close(catch)
+ catchFunc := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+ catch <- args
+ return nil
+ })
+ defer catchFunc.Release()
+
+ awaitable.Call("then", thenFunc).Call("catch", catchFunc)
+
+ select {
+ case result := <-then:
+ return result, nil
+ case err := <-catch:
+ return nil, err
+ }
+}
--
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