mirror of
https://github.com/arangodb/kube-arangodb.git
synced 2024-12-14 11:57:37 +00:00
144 lines
2.6 KiB
Go
144 lines
2.6 KiB
Go
//
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// DISCLAIMER
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//
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// Copyright 2024 ArangoDB GmbH, Cologne, Germany
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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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//
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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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package v1
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import (
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"io"
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"os"
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"path"
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"sort"
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"time"
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"github.com/arangodb/kube-arangodb/pkg/util"
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"github.com/arangodb/kube-arangodb/pkg/util/errors"
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)
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const MaxSize = 128
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type cache struct {
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parent *implementation
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eol time.Time
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signingToken []byte
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validationTokens [][]byte
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}
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func (i *implementation) newCache(cfg Configuration) (*cache, error) {
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files, err := os.ReadDir(i.cfg.Path)
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if err != nil {
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return nil, err
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}
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var keys []string
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var tokens = make(map[string][]byte)
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for _, file := range files {
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if file.IsDir() {
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continue
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}
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data, err := util.OpenWithRead(path.Join(i.cfg.Path, file.Name()), MaxSize)
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if err != nil {
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continue
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}
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if len(data) == 0 {
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continue
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}
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buff := make([]byte, cfg.Create.MaxSize)
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for id := range buff {
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buff[id] = 0
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}
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copy(buff, data)
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keys = append(keys, file.Name())
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tokens[file.Name()] = buff
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}
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if len(keys) == 0 {
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return nil, io.ErrUnexpectedEOF
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}
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sort.Strings(keys)
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data := make([][]byte, len(keys))
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for id := range data {
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data[id] = tokens[keys[id]]
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}
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cache := cache{
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parent: i,
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eol: time.Now().Add(i.cfg.TTL),
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signingToken: tokens[keys[0]],
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validationTokens: data,
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}
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return &cache, nil
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}
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func (i *implementation) localGetCache() *cache {
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if c := i.cache; c != nil && c.eol.After(time.Now()) {
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return c
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}
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return nil
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}
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func (i *implementation) withCache() (*cache, error) {
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if c := i.getCache(); c != nil {
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return c, nil
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}
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return i.refreshCache()
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}
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func (i *implementation) getCache() *cache {
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i.lock.RLock()
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defer i.lock.RUnlock()
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return i.localGetCache()
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}
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func (i *implementation) refreshCache() (*cache, error) {
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i.lock.Lock()
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defer i.lock.Unlock()
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if c := i.localGetCache(); c != nil {
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return c, nil
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}
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// Get was not successful, retry
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if c, err := i.newCache(i.cfg); err != nil {
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return nil, err
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} else if c == nil {
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return nil, errors.Errorf("cache returned is nil")
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} else {
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i.cache = c
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return i.cache, nil
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}
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}
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