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