95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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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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package dynconfig
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import (
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"errors"
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"time"
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"d7y.io/dragonfly/v2/pkg/cache"
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)
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type dynconfigManager struct {
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cachePath string
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cache cache.Cache
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expire time.Duration
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client ManagerClient
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}
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// newDynconfigManager returns a new manager dynconfig instence
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func newDynconfigManager(expire time.Duration, cachePath string, client ManagerClient) (*dynconfigManager, error) {
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d := &dynconfigManager{
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cache: cache.New(expire, cache.NoCleanup),
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cachePath: cachePath,
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expire: expire,
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client: client,
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}
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if err := d.cache.LoadFile(d.cachePath); err != nil {
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if err := d.load(); err != nil {
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return nil, err
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}
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}
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return d, nil
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}
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// Get dynamic config
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func (d *dynconfigManager) get() (interface{}, error) {
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// Cache has not expired
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dynconfig, _, found := d.cache.GetWithExpiration(defaultCacheKey)
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if found {
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return dynconfig, nil
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}
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// Cache has expired
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// Reload and ignore client request error
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d.load()
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dynconfig, ok := d.cache.Get(defaultCacheKey)
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if !ok {
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return nil, errors.New("can't find the cached data")
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}
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return dynconfig, nil
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}
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// Unmarshal unmarshals the config into a Struct. Make sure that the tags
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// on the fields of the structure are properly set.
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func (d *dynconfigManager) Unmarshal(rawVal interface{}, opts ...DecoderConfigOption) error {
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dynconfig, err := d.get()
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if err != nil {
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return errors.New("can't find the cached data")
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}
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return decode(dynconfig, defaultDecoderConfig(rawVal, opts...))
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}
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// Load dynamic config from manager
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func (d *dynconfigManager) load() error {
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dynconfig, err := d.client.Get()
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if err != nil {
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return err
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}
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d.cache.Set(defaultCacheKey, dynconfig, d.expire)
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if err := d.cache.SaveFile(d.cachePath); err != nil {
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return err
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}
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return nil
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}
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