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