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goroutineassistant.go
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goroutineassistant.go
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// Copyright 2015 The rkt Authors
//
// 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 testutils
import (
"fmt"
"runtime"
"sync"
"testing"
"github.com/coreos/gexpect"
)
type GoroutineAssistant struct {
s chan error
wg sync.WaitGroup
t *testing.T
}
func NewGoroutineAssistant(t *testing.T) *GoroutineAssistant {
return &GoroutineAssistant{
s: make(chan error),
t: t,
}
}
func (a *GoroutineAssistant) Fatalf(s string, args ...interface{}) {
a.s <- fmt.Errorf(s, args...)
runtime.Goexit()
}
func (a *GoroutineAssistant) Add(n int) {
a.wg.Add(n)
}
func (a *GoroutineAssistant) Done() {
a.wg.Done()
}
func (a *GoroutineAssistant) Wait() {
go func() {
a.wg.Wait()
a.s <- nil
}()
err := <-a.s
if err == nil {
// success
return
}
// Let's mimic testing.Fatalf()'s behavior and fatal with the first received error.
// All other goroutines will be killed.
a.t.Logf("Error encountered - shutting down")
a.t.Fatal(err)
}
func (a *GoroutineAssistant) WaitOrFail(child *gexpect.ExpectSubprocess) {
err := child.Wait()
if err != nil {
a.Fatalf("rkt didn't terminate correctly: %v", err)
}
}
func (a *GoroutineAssistant) SpawnOrFail(cmd string) *gexpect.ExpectSubprocess {
a.t.Logf("Command: %v", cmd)
child, err := gexpect.Spawn(cmd)
if err != nil {
a.Fatalf("Cannot exec rkt: %v", err)
}
return child
}