| /* |
| * 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 ratelimit |
| |
| import ( |
| "encoding/json" |
| "net/http" |
| ) |
| |
| import ( |
| sentinel "github.com/alibaba/sentinel-golang/api" |
| "github.com/alibaba/sentinel-golang/core/base" |
| sc "github.com/alibaba/sentinel-golang/core/config" |
| "github.com/alibaba/sentinel-golang/core/flow" |
| "github.com/alibaba/sentinel-golang/logging" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/common/constant" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/common/extension/filter" |
| contexthttp "github.com/apache/dubbo-go-pixiu/pixiu/pkg/context/http" |
| pkgs "github.com/apache/dubbo-go-pixiu/pixiu/pkg/filter/sentinel" |
| "github.com/apache/dubbo-go-pixiu/pixiu/pkg/logger" |
| ) |
| |
| const ( |
| Kind = constant.HTTPRateLimitFilter |
| ) |
| |
| func init() { |
| filter.RegisterHttpFilter(&Plugin{}) |
| } |
| |
| type ( |
| // Plugin is http filter plugin. |
| Plugin struct { |
| } |
| |
| // FilterFactory is http filter instance |
| FilterFactory struct { |
| conf *Config |
| matcher *pkgs.Matcher |
| } |
| |
| // Filter is http filter instance |
| Filter struct { |
| conf *Config |
| matcher *pkgs.Matcher |
| } |
| ) |
| |
| func (p *Plugin) Kind() string { |
| return Kind |
| } |
| |
| func (p *Plugin) CreateFilterFactory() (filter.HttpFilterFactory, error) { |
| return &FilterFactory{conf: &Config{}}, nil |
| } |
| |
| func (factory *FilterFactory) PrepareFilterChain(ctx *contexthttp.HttpContext, chain filter.FilterChain) error { |
| f := &Filter{conf: factory.conf, matcher: factory.matcher} |
| chain.AppendDecodeFilters(f) |
| return nil |
| } |
| |
| func (f *Filter) Decode(hc *contexthttp.HttpContext) filter.FilterStatus { |
| |
| path := hc.GetUrl() |
| resourceName, ok := f.matcher.Match(path) |
| //if not exists, just skip it. |
| if !ok { |
| return filter.Continue |
| } |
| |
| entry, blockErr := sentinel.Entry(resourceName, sentinel.WithResourceType(base.ResTypeAPIGateway), sentinel.WithTrafficType(base.Inbound)) |
| |
| //if blockErr not nil, indicates the request was blocked by Sentinel |
| if blockErr != nil { |
| bt, _ := json.Marshal(contexthttp.ErrResponse{Message: "blocked by rate limit"}) |
| hc.SendLocalReply(http.StatusTooManyRequests, bt) |
| return filter.Stop |
| } |
| defer entry.Exit() |
| return filter.Continue |
| } |
| |
| func (factory *FilterFactory) Config() interface{} { |
| return factory.conf |
| } |
| |
| func (factory *FilterFactory) Apply() error { |
| // init matcher |
| factory.matcher = pkgs.NewMatcher() |
| conf := factory.conf |
| factory.matcher.Load(conf.Resources) |
| |
| // init sentinel |
| sentinelConf := sc.NewDefaultConfig() |
| if len(conf.LogPath) > 0 { |
| sentinelConf.Sentinel.Log.Dir = conf.LogPath |
| } |
| _ = logging.ResetGlobalLogger(pkgs.GetWrappedLogger()) |
| |
| if err := sentinel.InitWithConfig(sentinelConf); err != nil { |
| return err |
| } |
| OnRulesUpdate(conf.Rules) |
| return nil |
| } |
| |
| // OnRulesUpdate update rule |
| func OnRulesUpdate(rules []*Rule) { |
| var enableRules []*flow.Rule |
| for _, v := range rules { |
| if v.Enable { |
| enableRules = append(enableRules, &v.FlowRule) |
| } |
| } |
| |
| if _, err := flow.LoadRules(enableRules); err != nil { |
| logger.Warnf("rate limit load rules err: %v", err) |
| } |
| } |