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dynconfig.go
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dynconfig.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.
*/
//go:generate mockgen -destination mocks/dynconfig_mock.go -source dynconfig.go -package mocks
package dynconfig
import (
"errors"
"sync"
"time"
"github.com/mitchellh/mapstructure"
"go.uber.org/atomic"
logger "d7y.io/dragonfly/v2/internal/dflog"
"d7y.io/dragonfly/v2/pkg/cache"
)
type SourceType string
const (
// CacheDirName is dir name of dynconfig cache.
CacheDirName = "dynconfig"
)
const (
// defaultCacheKey represents cache key of dynconfig.
defaultCacheKey = "dynconfig"
)
type Dynconfig[T any] interface {
// Get raw dynamic config.
Get() (*T, error)
// Refresh refreshes dynconfig in cache.
Refresh() error
}
type dynconfig[T any] struct {
cache cache.Cache
client ManagerClient
cachePath string
data *atomic.Pointer[T]
expire time.Duration
mu *sync.Mutex
}
// New returns a new dynconfig instance.
func New[T any](client ManagerClient, cachePath string, expire time.Duration) (Dynconfig[T], error) {
d := &dynconfig[T]{
cache: cache.New(expire, cache.NoCleanup),
cachePath: cachePath,
data: atomic.NewPointer[T](nil),
expire: expire,
client: client,
mu: &sync.Mutex{},
}
if err := d.load(); err != nil {
return nil, err
}
return d, nil
}
// Refresh refreshes dynconfig in cache.
func (d *dynconfig[T]) Refresh() error {
return d.load()
}
// Get dynamic config.
func (d *dynconfig[T]) Get() (*T, error) {
// If load is abnormal, data can be nil.
if d.data.Load() == nil {
return nil, errors.New("invalid data")
}
// Cache has not expired.
if _, _, found := d.cache.GetWithExpiration(defaultCacheKey); found {
return d.data.Load(), nil
}
// Cache has expired, refresh and ignore client request error.
if err := d.load(); err != nil {
logger.Warn("reload failed ", err)
}
if _, found := d.cache.Get(defaultCacheKey); found {
return d.data.Load(), nil
}
return nil, errors.New("cache not found")
}
// Load dynamic config from manager.
func (d *dynconfig[T]) load() error {
// If another load is in progress, return directly.
if !d.mu.TryLock() {
return errors.New("load is running")
}
defer d.mu.Unlock()
rawData, err := d.client.Get()
if err != nil {
return err
}
var data T
if err := decode(rawData, defaultDecoderConfig(&data)); err != nil {
return err
}
d.data.Store(&data)
d.cache.Set(defaultCacheKey, rawData, d.expire)
if err := d.cache.SaveFile(d.cachePath); err != nil {
return err
}
return nil
}
// defaultDecoderConfig returns default mapstructure.DecoderConfig with support
// of time.Duration values & string slices.
func defaultDecoderConfig(output any) *mapstructure.DecoderConfig {
c := &mapstructure.DecoderConfig{
Metadata: nil,
Result: output,
WeaklyTypedInput: true,
DecodeHook: mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToSliceHookFunc(","),
),
}
return c
}
// A wrapper around mapstructure.Decode that mimics the WeakDecode functionality.
func decode(input any, config *mapstructure.DecoderConfig) error {
decoder, err := mapstructure.NewDecoder(config)
if err != nil {
return err
}
return decoder.Decode(input)
}