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limit_test.go
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// Copyright 2019 ko Build Authors All Rights Reserved.
//
// 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 build
import (
"context"
"testing"
"time"
"golang.org/x/sync/errgroup"
)
type sleeper struct{}
var _ Interface = (*sleeper)(nil)
// QualifyImport implements Interface
func (*sleeper) QualifyImport(ip string) (string, error) {
return ip, nil
}
// IsSupportedReference implements Interface
func (*sleeper) IsSupportedReference(_ string) error {
return nil
}
// Build implements Interface
func (*sleeper) Build(_ context.Context, _ string) (Result, error) {
time.Sleep(50 * time.Millisecond)
return nil, nil
}
func TestLimiter(t *testing.T) {
b := NewLimiter(&sleeper{}, 2)
start := time.Now()
g, _ := errgroup.WithContext(context.TODO())
for i := 0; i <= 10; i++ {
g.Go(func() error {
_, _ = b.Build(context.Background(), "whatever")
return nil
})
}
g.Wait()
// 50 ms * 10 builds / 2 concurrency = ~250ms
if time.Now().Before(start.Add(250 * time.Millisecond)) {
t.Fatal("Too many builds")
}
}