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92 lines
2.2 KiB
92 lines
2.2 KiB
// Copyright 2022 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package cache
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import (
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"context"
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"sync"
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"code.gitea.io/gitea/modules/log"
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)
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// cacheContext is a context that can be used to cache data in a request level context
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// This is useful for caching data that is expensive to calculate and is likely to be
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// used multiple times in a request.
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type cacheContext struct {
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ctx context.Context
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data map[any]map[any]any
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lock sync.RWMutex
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}
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func (cc *cacheContext) Get(tp, key any) any {
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cc.lock.RLock()
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defer cc.lock.RUnlock()
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if cc.data[tp] == nil {
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return nil
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}
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return cc.data[tp][key]
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}
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func (cc *cacheContext) Put(tp, key, value any) {
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cc.lock.Lock()
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defer cc.lock.Unlock()
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if cc.data[tp] == nil {
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cc.data[tp] = make(map[any]any)
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}
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cc.data[tp][key] = value
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}
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func (cc *cacheContext) Delete(tp, key any) {
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cc.lock.Lock()
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defer cc.lock.Unlock()
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if cc.data[tp] == nil {
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return
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}
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delete(cc.data[tp], key)
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}
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var cacheContextKey = struct{}{}
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func WithCacheContext(ctx context.Context) context.Context {
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return context.WithValue(ctx, cacheContextKey, &cacheContext{
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ctx: ctx,
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data: make(map[any]map[any]any),
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})
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}
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func GetContextData(ctx context.Context, tp, key any) any {
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if c, ok := ctx.Value(cacheContextKey).(*cacheContext); ok {
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return c.Get(tp, key)
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}
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log.Warn("cannot get cache context when getting data: %v", ctx)
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return nil
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}
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func SetContextData(ctx context.Context, tp, key, value any) {
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if c, ok := ctx.Value(cacheContextKey).(*cacheContext); ok {
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c.Put(tp, key, value)
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return
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}
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log.Warn("cannot get cache context when setting data: %v", ctx)
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}
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func RemoveContextData(ctx context.Context, tp, key any) {
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if c, ok := ctx.Value(cacheContextKey).(*cacheContext); ok {
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c.Delete(tp, key)
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}
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}
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// GetWithContextCache returns the cache value of the given key in the given context.
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func GetWithContextCache[T any](ctx context.Context, cacheGroupKey string, cacheTargetID any, f func() (T, error)) (T, error) {
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v := GetContextData(ctx, cacheGroupKey, cacheTargetID)
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if vv, ok := v.(T); ok {
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return vv, nil
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}
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t, err := f()
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if err != nil {
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return t, err
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}
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SetContextData(ctx, cacheGroupKey, cacheTargetID, t)
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return t, nil
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}
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