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promise.go
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/
promise.go
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//go:build js
// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package jsutil
import (
"syscall/js"
"github.com/google/chrome-ssh-agent/go/jsutil"
)
// DoSync runs f, and then blocks until it is complete. Since this blocks,
// it is not suitable to run outside of tests.
func DoSync(f func(ctx jsutil.AsyncContext)) {
done := make(chan struct{})
jsutil.Async(func(ctx jsutil.AsyncContext) (js.Value, error) {
f(ctx)
return js.Undefined(), nil
}).Then(
func(val js.Value) { close(done) },
func(err error) { close(done) },
)
<-done
}