mirror of
https://github.com/alibaba/higress.git
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300 lines
9.3 KiB
Go
300 lines
9.3 KiB
Go
// Copyright (c) 2024 Alibaba Group Holding Ltd.
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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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package main
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import (
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"fmt"
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"net"
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"net/url"
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"strconv"
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"strings"
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"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
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"github.com/tidwall/gjson"
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"github.com/tidwall/resp"
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)
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func main() {
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wrapper.SetCtx(
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"ai-token-ratelimit",
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wrapper.ParseConfigBy(parseConfig),
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wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders),
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wrapper.ProcessStreamingResponseBodyBy(onHttpStreamingBody),
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)
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}
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const (
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ClusterRateLimitFormat string = "higress-token-ratelimit:%s:%s:%s:%s"
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RequestPhaseFixedWindowScript string = `
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local ttl = redis.call('ttl', KEYS[1])
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if ttl < 0 then
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redis.call('set', KEYS[1], ARGV[1], 'EX', ARGV[2])
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return {ARGV[1], ARGV[1], ARGV[2]}
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end
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return {ARGV[1], redis.call('get', KEYS[1]), ttl}
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`
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ResponsePhaseFixedWindowScript string = `
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local ttl = redis.call('ttl', KEYS[1])
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if ttl < 0 then
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redis.call('set', KEYS[1], ARGV[1]-ARGV[3], 'EX', ARGV[2])
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return {ARGV[1], ARGV[1]-ARGV[3], ARGV[2]}
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end
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return {ARGV[1], redis.call('decrby', KEYS[1], ARGV[3]), ttl}
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`
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LimitRedisContextKey string = "LimitRedisContext"
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ConsumerHeader string = "x-mse-consumer" // LimitByConsumer从该request header获取consumer的名字
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CookieHeader string = "cookie"
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RateLimitLimitHeader string = "X-RateLimit-Limit" // 限制的总请求数
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RateLimitRemainingHeader string = "X-RateLimit-Remaining" // 剩余还可以发送的请求数
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RateLimitResetHeader string = "X-RateLimit-Reset" // 限流重置时间（触发限流时返回）
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)
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type LimitContext struct {
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count int
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remaining int
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reset int
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}
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type LimitRedisContext struct {
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key string
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count int64
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window int64
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}
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func parseConfig(json gjson.Result, config *ClusterKeyRateLimitConfig, log wrapper.Log) error {
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err := initRedisClusterClient(json, config)
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if err != nil {
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return err
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}
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err = parseClusterKeyRateLimitConfig(json, config)
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if 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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func onHttpRequestHeaders(ctx wrapper.HttpContext, config ClusterKeyRateLimitConfig, log wrapper.Log) types.Action {
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// 判断是否命中限流规则
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val, ruleItem, configItem := checkRequestAgainstLimitRule(ctx, config.ruleItems, log)
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if ruleItem == nil || configItem == nil {
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return types.ActionContinue
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}
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// 构建redis限流key和参数
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limitKey := fmt.Sprintf(ClusterRateLimitFormat, config.ruleName, ruleItem.limitType, ruleItem.key, val)
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keys := []interface{}{limitKey}
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args := []interface{}{configItem.count, configItem.timeWindow}
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limitRedisContext := LimitRedisContext{
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key: limitKey,
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count: configItem.count,
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window: configItem.timeWindow,
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}
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ctx.SetContext(LimitRedisContextKey, limitRedisContext)
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// 执行限流逻辑
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err := config.redisClient.Eval(RequestPhaseFixedWindowScript, 1, keys, args, func(response resp.Value) {
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resultArray := response.Array()
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if len(resultArray) != 3 {
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log.Errorf("redis response parse error, response: %v", response)
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proxywasm.ResumeHttpRequest()
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return
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}
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context := LimitContext{
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count: resultArray[0].Integer(),
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remaining: resultArray[1].Integer(),
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reset: resultArray[2].Integer(),
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}
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if context.remaining < 0 {
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// 触发限流
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rejected(config, context)
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} else {
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proxywasm.ResumeHttpRequest()
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}
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})
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if err != nil {
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log.Errorf("redis call failed: %v", err)
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return types.ActionContinue
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}
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return types.ActionPause
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}
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func onHttpStreamingBody(ctx wrapper.HttpContext, config ClusterKeyRateLimitConfig, data []byte, endOfStream bool, log wrapper.Log) []byte {
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if !endOfStream {
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return data
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}
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inputTokenStr, err := proxywasm.GetProperty([]string{"filter_state", "wasm.input_token"})
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if err != nil {
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return data
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}
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outputTokenStr, err := proxywasm.GetProperty([]string{"filter_state", "wasm.output_token"})
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if err != nil {
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return data
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}
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inputToken, err := strconv.Atoi(string(inputTokenStr))
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if err != nil {
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return data
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}
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outputToken, err := strconv.Atoi(string(outputTokenStr))
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if err != nil {
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return data
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}
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limitRedisContext, ok := ctx.GetContext(LimitRedisContextKey).(LimitRedisContext)
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if !ok {
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return data
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}
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keys := []interface{}{limitRedisContext.key}
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args := []interface{}{limitRedisContext.count, limitRedisContext.window, inputToken + outputToken}
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err = config.redisClient.Eval(ResponsePhaseFixedWindowScript, 1, keys, args, nil)
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if err != nil {
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log.Errorf("redis call failed: %v", err)
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return data
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} else {
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return data
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}
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}
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func checkRequestAgainstLimitRule(ctx wrapper.HttpContext, ruleItems []LimitRuleItem, log wrapper.Log) (string, *LimitRuleItem, *LimitConfigItem) {
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for _, rule := range ruleItems {
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val, ruleItem, configItem := hitRateRuleItem(ctx, rule, log)
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if ruleItem != nil && configItem != nil {
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return val, ruleItem, configItem
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}
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}
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return "", nil, nil
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}
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func hitRateRuleItem(ctx wrapper.HttpContext, rule LimitRuleItem, log wrapper.Log) (string, *LimitRuleItem, *LimitConfigItem) {
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switch rule.limitType {
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// 根据HTTP请求头限流
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case limitByHeaderType, limitByPerHeaderType:
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val, err := proxywasm.GetHttpRequestHeader(rule.key)
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if err != nil {
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return logDebugAndReturnEmpty(log, "failed to get request header %s: %v", rule.key, err)
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}
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return val, &rule, findMatchingItem(rule.limitType, rule.configItems, val)
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// 根据HTTP请求参数限流
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case limitByParamType, limitByPerParamType:
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parse, err := url.Parse(ctx.Path())
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if err != nil {
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return logDebugAndReturnEmpty(log, "failed to parse request path: %v", err)
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}
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query, err := url.ParseQuery(parse.RawQuery)
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if err != nil {
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return logDebugAndReturnEmpty(log, "failed to parse query params: %v", err)
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}
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val, ok := query[rule.key]
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if !ok {
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return logDebugAndReturnEmpty(log, "request param %s is empty", rule.key)
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}
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return val[0], &rule, findMatchingItem(rule.limitType, rule.configItems, val[0])
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// 根据consumer限流
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case limitByConsumerType, limitByPerConsumerType:
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val, err := proxywasm.GetHttpRequestHeader(ConsumerHeader)
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if err != nil {
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return logDebugAndReturnEmpty(log, "failed to get request header %s: %v", ConsumerHeader, err)
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}
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return val, &rule, findMatchingItem(rule.limitType, rule.configItems, val)
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// 根据cookie中key值限流
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case limitByCookieType, limitByPerCookieType:
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cookie, err := proxywasm.GetHttpRequestHeader(CookieHeader)
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if err != nil {
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return logDebugAndReturnEmpty(log, "failed to get request cookie : %v", err)
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}
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val := extractCookieValueByKey(cookie, rule.key)
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if val == "" {
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return logDebugAndReturnEmpty(log, "cookie key '%s' extracted from cookie '%s' is empty.", rule.key, cookie)
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}
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return val, &rule, findMatchingItem(rule.limitType, rule.configItems, val)
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// 根据客户端IP限流
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case limitByPerIpType:
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realIp, err := getDownStreamIp(rule)
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if err != nil {
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log.Warnf("failed to get down stream ip: %v", err)
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return "", &rule, nil
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}
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for _, item := range rule.configItems {
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if _, found, _ := item.ipNet.Get(realIp); !found {
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continue
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}
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return realIp.String(), &rule, &item
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}
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}
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return "", nil, nil
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}
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func logDebugAndReturnEmpty(log wrapper.Log, errMsg string, args ...interface{}) (string, *LimitRuleItem, *LimitConfigItem) {
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log.Debugf(errMsg, args...)
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return "", nil, nil
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}
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func findMatchingItem(limitType limitRuleItemType, items []LimitConfigItem, key string) *LimitConfigItem {
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for _, item := range items {
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// per类型,检查allType和regexpType
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if limitType == limitByPerHeaderType ||
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limitType == limitByPerParamType ||
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limitType == limitByPerConsumerType ||
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limitType == limitByPerCookieType {
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if item.configType == allType || (item.configType == regexpType && item.regexp.MatchString(key)) {
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return &item
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}
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}
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// 其他类型,直接比较key
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if item.key == key {
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return &item
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}
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}
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return nil
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}
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func getDownStreamIp(rule LimitRuleItem) (net.IP, error) {
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var (
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realIpStr string
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err error
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)
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if rule.limitByPerIp.sourceType == HeaderSourceType {
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realIpStr, err = proxywasm.GetHttpRequestHeader(rule.limitByPerIp.headerName)
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if err == nil {
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realIpStr = strings.Split(strings.Trim(realIpStr, " "), ",")[0]
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}
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} else {
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var bs []byte
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bs, err = proxywasm.GetProperty([]string{"source", "address"})
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realIpStr = string(bs)
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}
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if err != nil {
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return nil, err
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}
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ip := parseIP(realIpStr)
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realIP := net.ParseIP(ip)
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if realIP == nil {
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return nil, fmt.Errorf("invalid ip[%s]", ip)
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}
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return realIP, nil
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}
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func rejected(config ClusterKeyRateLimitConfig, context LimitContext) {
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headers := make(map[string][]string)
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headers[RateLimitResetHeader] = []string{strconv.Itoa(context.reset)}
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_ = proxywasm.SendHttpResponseWithDetail(
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config.rejectedCode, "ai-token-ratelimit.rejected", reconvertHeaders(headers), []byte(config.rejectedMsg), -1)
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}
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