| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 ( |
| "sync" |
| ) |
| |
| import ( |
| "github.com/creasty/defaults" |
| "github.com/pkg/errors" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/common/yaml" |
| "github.com/apache/dubbo-go-pixiu/pkg/context/http" |
| "github.com/apache/dubbo-go-pixiu/pkg/logger" |
| "github.com/apache/dubbo-go-pixiu/pkg/model" |
| ) |
| |
| // FilterManager manage filters |
| type FilterManager struct { |
| filters map[string]HttpFilterFactory |
| filtersArray []*HttpFilterFactory |
| filterConfigs []*model.HTTPFilter |
| |
| mu sync.RWMutex |
| } |
| |
| // NewFilterManager create filter manager |
| func NewFilterManager(fs []*model.HTTPFilter) *FilterManager { |
| fm := &FilterManager{filterConfigs: fs, filters: make(map[string]HttpFilterFactory)} |
| return fm |
| } |
| |
| // NewEmptyFilterManager create empty filter manager |
| func NewEmptyFilterManager() *FilterManager { |
| return &FilterManager{filters: make(map[string]HttpFilterFactory)} |
| } |
| |
| func (fm *FilterManager) CreateFilterChain(ctx *http.HttpContext) FilterChain { |
| chain := NewDefaultFilterChain() |
| |
| for _, f := range fm.GetFactory() { |
| _ = (*f).PrepareFilterChain(ctx, chain) |
| } |
| return chain |
| } |
| |
| // GetFactory get all filter from manager |
| func (fm *FilterManager) GetFactory() []*HttpFilterFactory { |
| fm.mu.RLock() |
| defer fm.mu.RUnlock() |
| |
| return fm.filtersArray |
| } |
| |
| // Load the filter from config |
| func (fm *FilterManager) Load() { |
| fm.ReLoad(fm.filterConfigs) |
| } |
| |
| // ReLoad filter configs |
| func (fm *FilterManager) ReLoad(filters []*model.HTTPFilter) { |
| tmp := make(map[string]HttpFilterFactory) |
| filtersArray := make([]*HttpFilterFactory, len(filters)) |
| for i, f := range filters { |
| apply, err := fm.Apply(f.Name, f.Config) |
| if err != nil { |
| logger.Errorf("apply [%s] init fail, %s", f.Name, err.Error()) |
| } |
| tmp[f.Name] = apply |
| filtersArray[i] = &apply |
| } |
| // avoid filter inconsistency |
| fm.mu.Lock() |
| defer fm.mu.Unlock() |
| |
| fm.filters = tmp |
| fm.filtersArray = filtersArray |
| } |
| |
| // Apply return a new filter factory by name & conf |
| func (fm *FilterManager) Apply(name string, conf map[string]interface{}) (HttpFilterFactory, error) { |
| plugin, err := GetHttpFilterPlugin(name) |
| if err != nil { |
| return nil, errors.New("filter not found") |
| } |
| |
| filter, err := plugin.CreateFilterFactory() |
| |
| if err != nil { |
| return nil, errors.New("plugin create filter error") |
| } |
| |
| factoryConf := filter.Config() |
| if err := yaml.ParseConfig(factoryConf, conf); err != nil { |
| return nil, errors.Wrap(err, "config error") |
| } |
| if err = defaults.Set(factoryConf); err != nil { |
| return nil, err |
| } |
| err = filter.Apply() |
| if err != nil { |
| return nil, errors.Wrap(err, "create fail") |
| } |
| return filter, nil |
| } |