mirror of
https://github.com/ko-build/ko.git
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56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
// Copyright 2019 Google LLC All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package build
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import (
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"context"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"golang.org/x/sync/semaphore"
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)
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// Limiter composes with another Interface to limit the number of concurrent builds.
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type Limiter struct {
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Builder Interface
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semaphore *semaphore.Weighted
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}
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// Limiter implements Interface
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var _ Interface = (*Recorder)(nil)
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// IsSupportedReference implements Interface
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func (l *Limiter) IsSupportedReference(ip string) bool {
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return l.Builder.IsSupportedReference(ip)
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}
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// Build implements Interface
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func (l *Limiter) Build(ctx context.Context, ip string) (v1.Image, error) {
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// TODO(jonjohnsonjr): Build should take a context.Context.
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if err := l.semaphore.Acquire(context.TODO(), 1); err != nil {
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return nil, err
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}
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defer l.semaphore.Release(1)
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return l.Builder.Build(ctx, ip)
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}
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// NewLimiter returns a new builder that only allows n concurrent builds of b.
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func NewLimiter(b Interface, n int) *Limiter {
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return &Limiter{
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Builder: b,
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semaphore: semaphore.NewWeighted(int64(n)),
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}
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}
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