mirror of
https://github.com/ko-build/ko.git
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81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
// Copyright 2018 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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"sync"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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)
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// Caching wraps a builder implementation in a layer that shares build results
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// for the same inputs using a simple "future" implementation. Cached results
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// may be invalidated by calling Invalidate with the same input passed to Build.
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type Caching struct {
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inner Interface
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m sync.Mutex
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results map[string]*future
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}
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// Caching implements Interface
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var _ Interface = (*Caching)(nil)
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// NewCaching wraps the provided build.Interface in an implementation that
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// shares build results for a given path until the result has been invalidated.
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func NewCaching(inner Interface) (*Caching, error) {
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return &Caching{
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inner: inner,
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results: make(map[string]*future),
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}, nil
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}
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// Build implements Interface
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func (c *Caching) Build(ctx context.Context, ip string) (v1.Image, error) {
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f := func() *future {
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// Lock the map of futures.
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c.m.Lock()
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defer c.m.Unlock()
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// If a future for "ip" exists, then return it.
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f, ok := c.results[ip]
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if ok {
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return f
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}
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// Otherwise create and record a future for a Build of "ip".
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f = newFuture(func() (v1.Image, error) {
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return c.inner.Build(ctx, ip)
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})
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c.results[ip] = f
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return f
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}()
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return f.Get()
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}
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// IsSupportedReference implements Interface
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func (c *Caching) IsSupportedReference(ip string) bool {
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return c.inner.IsSupportedReference(ip)
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}
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// Invalidate removes an import path's cached results.
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func (c *Caching) Invalidate(ip string) {
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c.m.Lock()
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defer c.m.Unlock()
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delete(c.results, ip)
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}
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