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cache.go
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cache.go
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// Copyright 2022-2024 The Parca Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package namespace
import (
"io/fs"
"os"
"time"
"github.com/go-kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/parca-dev/parca-agent/pkg/cache"
)
type realfs struct{}
func (f *realfs) Open(name string) (fs.File, error) {
return os.Open(name)
}
type Cache struct {
c *cache.LoadingLRUCacheWithTTL[int, []int]
}
func NewCache(logger log.Logger, reg prometheus.Registerer, profilingDuration time.Duration) *Cache {
return &Cache{
cache.NewLoadingLRUCacheWithTTL[int, []int](
prometheus.WrapRegistererWith(prometheus.Labels{"cache": "process_namespace"}, reg),
512, // cache size.
10*profilingDuration, // cache TTL.
func(pid int) ([]int, error) {
return FindPIDs(&realfs{}, pid)
},
),
}
}
func (c *Cache) Get(key int) ([]int, error) {
return c.c.Get(key)
}