mirror of https://github.com/harness/drone.git
90 lines
2.7 KiB
Go
90 lines
2.7 KiB
Go
// Copyright 2023 Harness, Inc.
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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 cache
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import (
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"context"
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"time"
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"github.com/harness/gitness/app/paths"
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"github.com/harness/gitness/app/store"
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"github.com/harness/gitness/cache"
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"github.com/harness/gitness/types"
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)
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// pathCacheGetter is used to hook a spacePathStore as source of a PathCache.
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// IMPORTANT: It assumes that the spacePathCache already transformed the key.
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type pathCacheGetter struct {
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spacePathStore store.SpacePathStore
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}
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func New(
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appCtx context.Context,
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pathStore store.SpacePathStore,
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spacePathTransformation store.SpacePathTransformation,
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evictor Evictor[*types.SpaceCore],
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dur time.Duration,
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) store.SpacePathCache {
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innerCache := cache.New[string, *types.SpacePath](&pathCacheGetter{spacePathStore: pathStore}, dur)
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c := spacePathCache{
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inner: innerCache,
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spacePathTransformation: spacePathTransformation,
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}
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// In case when a space core is updated, we should remove from the cache its space path and all of its sub-paths.
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// Update of a space core (space identifier or space path) is a rare operation, so clearing cache is justified.
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evictor.Subscribe(appCtx, func(*types.SpaceCore) error {
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innerCache.EvictAll(appCtx)
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return nil
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})
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return c
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}
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func (g *pathCacheGetter) Find(ctx context.Context, key string) (*types.SpacePath, error) {
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path, err := g.spacePathStore.FindByPath(ctx, key)
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if err != nil {
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return nil, err
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}
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return path, nil
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}
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// spacePathCache is a decorator of a Cache required to handle path transformations.
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type spacePathCache struct {
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inner cache.Cache[string, *types.SpacePath]
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spacePathTransformation store.SpacePathTransformation
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}
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func (c spacePathCache) Get(ctx context.Context, key string) (*types.SpacePath, error) {
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// build unique key from provided value
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segments := paths.Segments(key)
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uniqueKey := ""
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for i, segment := range segments {
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uniqueKey = paths.Concatenate(uniqueKey, c.spacePathTransformation(segment, i == 0))
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}
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return c.inner.Get(ctx, uniqueKey)
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}
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func (c spacePathCache) Stats() (int64, int64) {
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return c.inner.Stats()
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}
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func (c spacePathCache) Evict(ctx context.Context, key string) {
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c.inner.Evict(ctx, key)
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}
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