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config_filter.go
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config_filter.go
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/*
* Copyright 1999-2020 Alibaba Group Holding Ltd.
*
* 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 filter
import (
"fmt"
"github.com/nacos-group/nacos-sdk-go/v2/vo"
)
type IConfigFilterChain interface {
AddFilter(IConfigFilter) error
GetFilters() []IConfigFilter
DoFilters(*vo.ConfigParam) error
DoFilterByName(*vo.ConfigParam, string) error
}
type IConfigFilter interface {
DoFilter(*vo.ConfigParam) error
GetOrder() int
GetFilterName() string
}
func RegisterConfigFilterToChain(chain IConfigFilterChain, filter IConfigFilter) error {
return chain.AddFilter(filter)
}
func NewConfigFilterChainManager() IConfigFilterChain {
return newConfigFilterChainManager()
}
func newConfigFilterChainManager() *DefaultConfigFilterChainManager {
return &DefaultConfigFilterChainManager{
configFilterPriorityQueue: make([]IConfigFilter, 0, 2),
}
}
type DefaultConfigFilterChainManager struct {
configFilterPriorityQueue
}
func (m *DefaultConfigFilterChainManager) AddFilter(filter IConfigFilter) error {
return m.configFilterPriorityQueue.addFilter(filter)
}
func (m *DefaultConfigFilterChainManager) GetFilters() []IConfigFilter {
return m.configFilterPriorityQueue
}
func (m *DefaultConfigFilterChainManager) DoFilters(param *vo.ConfigParam) error {
for index := 0; index < len(m.GetFilters()); index++ {
if err := m.GetFilters()[index].DoFilter(param); err != nil {
return err
}
}
return nil
}
func (m *DefaultConfigFilterChainManager) DoFilterByName(param *vo.ConfigParam, name string) error {
for index := 0; index < len(m.GetFilters()); index++ {
if m.GetFilters()[index].GetFilterName() == name {
if err := m.GetFilters()[index].DoFilter(param); err != nil {
return err
}
return nil
}
}
return fmt.Errorf("cannot find the filter[%s]", name)
}
type configFilterPriorityQueue []IConfigFilter
func (c *configFilterPriorityQueue) addFilter(filter IConfigFilter) error {
var pos int = len(*c)
for i := 0; i < len(*c); i++ {
if filter.GetFilterName() == (*c)[i].GetFilterName() {
return nil
}
if filter.GetOrder() < (*c)[i].GetOrder() {
pos = i
break
}
}
if pos == len(*c) {
*c = append((*c)[:], filter)
} else {
temp := append((*c)[:pos], filter)
*c = append(temp[:], (*c)[pos:]...)
}
return nil
}