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