mirror of
https://github.com/alibaba/higress.git
synced 2026-02-06 23:21:08 +08:00
301 lines
9.8 KiB
Go
301 lines
9.8 KiB
Go
// Copyright (c) 2024 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 main
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"net/url"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"cluster-key-rate-limit/config"
|
|
"cluster-key-rate-limit/util"
|
|
|
|
"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
|
|
"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
|
|
"github.com/higress-group/wasm-go/pkg/log"
|
|
"github.com/higress-group/wasm-go/pkg/wrapper"
|
|
"github.com/tidwall/gjson"
|
|
"github.com/tidwall/resp"
|
|
)
|
|
|
|
func main() {}
|
|
|
|
func init() {
|
|
wrapper.SetCtx(
|
|
"cluster-key-rate-limit",
|
|
wrapper.ParseConfig(parseConfig),
|
|
wrapper.ProcessRequestHeaders(onHttpRequestHeaders),
|
|
wrapper.ProcessResponseHeaders(onHttpResponseHeaders),
|
|
)
|
|
}
|
|
|
|
const (
|
|
// RedisKeyPrefix 集群限流插件在 Redis 中 key 的统一前缀
|
|
RedisKeyPrefix = "higress-cluster-key-rate-limit"
|
|
// ClusterGlobalRateLimitFormat 全局限流模式 redis key 为 RedisKeyPrefix:限流规则名称:global_threshold:时间窗口
|
|
ClusterGlobalRateLimitFormat = RedisKeyPrefix + ":%s:global_threshold:%d"
|
|
// ClusterRateLimitFormat 规则限流模式 redis key 为 RedisKeyPrefix:限流规则名称:限流类型:时间窗口:限流key名称:限流key对应的实际值
|
|
ClusterRateLimitFormat = RedisKeyPrefix + ":%s:%s:%d:%s:%s"
|
|
FixedWindowScript = `
|
|
local key = KEYS[1]
|
|
local threshold = tonumber(ARGV[1])
|
|
local window = tonumber(ARGV[2])
|
|
|
|
local current = tonumber(redis.call('get', key) or "0")
|
|
|
|
-- 只有超过阈值时才停止累加，达到阈值时仍允许（此时是最后一次允许）
|
|
if current > threshold then
|
|
return {threshold, current, redis.call('ttl', key)}
|
|
end
|
|
|
|
-- 计数未超过阈值，执行累加
|
|
current = redis.call('incr', key)
|
|
-- 第一次累加时设置过期时间
|
|
if current == 1 then
|
|
redis.call('expire', key, window)
|
|
end
|
|
|
|
return {threshold, current, redis.call('ttl', key)}
|
|
`
|
|
|
|
LimitContextKey = "LimitContext" // 限流上下文信息
|
|
|
|
CookieHeader = "cookie"
|
|
|
|
RateLimitLimitHeader = "X-RateLimit-Limit" // 限制的总请求数
|
|
RateLimitRemainingHeader = "X-RateLimit-Remaining" // 剩余还可以发送的请求数
|
|
RateLimitResetHeader = "X-RateLimit-Reset" // 限流重置时间（触发限流时返回）
|
|
)
|
|
|
|
type LimitContext struct {
|
|
count int
|
|
remaining int
|
|
reset int
|
|
}
|
|
|
|
func parseConfig(json gjson.Result, cfg *config.ClusterKeyRateLimitConfig) error {
|
|
err := config.InitRedisClusterClient(json, cfg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
err = config.ParseClusterKeyRateLimitConfig(json, cfg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func onHttpRequestHeaders(ctx wrapper.HttpContext, cfg config.ClusterKeyRateLimitConfig) types.Action {
|
|
ctx.DisableReroute()
|
|
limitKey, count, timeWindow := "", int64(0), int64(0)
|
|
|
|
if cfg.GlobalThreshold != nil {
|
|
// 全局限流模式
|
|
limitKey = fmt.Sprintf(ClusterGlobalRateLimitFormat, cfg.RuleName, cfg.GlobalThreshold.TimeWindow)
|
|
count = cfg.GlobalThreshold.Count
|
|
timeWindow = cfg.GlobalThreshold.TimeWindow
|
|
} else {
|
|
// 规则限流模式
|
|
val, ruleItem, configItem := checkRequestAgainstLimitRule(ctx, cfg.RuleItems)
|
|
if ruleItem == nil || configItem == nil {
|
|
// 没有匹配到限流规则直接返回
|
|
return types.ActionContinue
|
|
}
|
|
|
|
limitKey = fmt.Sprintf(ClusterRateLimitFormat, cfg.RuleName, ruleItem.LimitType, configItem.TimeWindow, ruleItem.Key, val)
|
|
count = configItem.Count
|
|
timeWindow = configItem.TimeWindow
|
|
}
|
|
|
|
// 执行限流逻辑
|
|
keys := []interface{}{limitKey}
|
|
args := []interface{}{count, timeWindow}
|
|
err := cfg.RedisClient.Eval(FixedWindowScript, 1, keys, args, func(response resp.Value) {
|
|
resultArray := response.Array()
|
|
if len(resultArray) != 3 {
|
|
log.Errorf("redis response parse error, response: %v", response)
|
|
proxywasm.ResumeHttpRequest()
|
|
return
|
|
}
|
|
|
|
// 获取限流结果
|
|
threshold, current, ttl := resultArray[0].Integer(), resultArray[1].Integer(), resultArray[2].Integer()
|
|
context := LimitContext{
|
|
count: threshold,
|
|
remaining: threshold - current,
|
|
reset: ttl,
|
|
}
|
|
if current > threshold {
|
|
// 触发限流
|
|
rejected(cfg, context)
|
|
} else {
|
|
ctx.SetContext(LimitContextKey, context)
|
|
proxywasm.ResumeHttpRequest()
|
|
}
|
|
})
|
|
|
|
if err != nil {
|
|
log.Errorf("redis call failed: %v", err)
|
|
return types.ActionContinue
|
|
}
|
|
return types.HeaderStopAllIterationAndWatermark
|
|
}
|
|
|
|
func onHttpResponseHeaders(ctx wrapper.HttpContext, config config.ClusterKeyRateLimitConfig) types.Action {
|
|
limitContext, ok := ctx.GetContext(LimitContextKey).(LimitContext)
|
|
if !ok {
|
|
return types.ActionContinue
|
|
}
|
|
if config.ShowLimitQuotaHeader {
|
|
_ = proxywasm.ReplaceHttpResponseHeader(RateLimitLimitHeader, strconv.Itoa(limitContext.count))
|
|
_ = proxywasm.ReplaceHttpResponseHeader(RateLimitRemainingHeader, strconv.Itoa(limitContext.remaining))
|
|
}
|
|
return types.ActionContinue
|
|
}
|
|
|
|
func checkRequestAgainstLimitRule(ctx wrapper.HttpContext, ruleItems []config.LimitRuleItem) (string, *config.LimitRuleItem, *config.LimitConfigItem) {
|
|
if len(ruleItems) > 0 {
|
|
for _, rule := range ruleItems {
|
|
val, ruleItem, configItem := hitRateRuleItem(ctx, rule)
|
|
if ruleItem != nil && configItem != nil {
|
|
return val, ruleItem, configItem
|
|
}
|
|
}
|
|
}
|
|
return "", nil, nil
|
|
}
|
|
|
|
func hitRateRuleItem(ctx wrapper.HttpContext, rule config.LimitRuleItem) (string, *config.LimitRuleItem, *config.LimitConfigItem) {
|
|
switch rule.LimitType {
|
|
// 根据HTTP请求头限流
|
|
case config.LimitByHeaderType, config.LimitByPerHeaderType:
|
|
val, err := proxywasm.GetHttpRequestHeader(rule.Key)
|
|
if err != nil {
|
|
return logDebugAndReturnEmpty("failed to get request header %s: %v", rule.Key, err)
|
|
}
|
|
return val, &rule, findMatchingItem(rule.LimitType, rule.ConfigItems, val)
|
|
// 根据HTTP请求参数限流
|
|
case config.LimitByParamType, config.LimitByPerParamType:
|
|
parse, err := url.Parse(ctx.Path())
|
|
if err != nil {
|
|
return logDebugAndReturnEmpty("failed to parse request path: %v", err)
|
|
}
|
|
query, err := url.ParseQuery(parse.RawQuery)
|
|
if err != nil {
|
|
return logDebugAndReturnEmpty("failed to parse query params: %v", err)
|
|
}
|
|
val, ok := query[rule.Key]
|
|
if !ok {
|
|
return logDebugAndReturnEmpty("request param %s is empty", rule.Key)
|
|
}
|
|
return val[0], &rule, findMatchingItem(rule.LimitType, rule.ConfigItems, val[0])
|
|
// 根据consumer限流
|
|
case config.LimitByConsumerType, config.LimitByPerConsumerType:
|
|
val, err := proxywasm.GetHttpRequestHeader(config.ConsumerHeader)
|
|
if err != nil {
|
|
return logDebugAndReturnEmpty("failed to get request header %s: %v", config.ConsumerHeader, err)
|
|
}
|
|
return val, &rule, findMatchingItem(rule.LimitType, rule.ConfigItems, val)
|
|
// 根据cookie中key值限流
|
|
case config.LimitByCookieType, config.LimitByPerCookieType:
|
|
cookie, err := proxywasm.GetHttpRequestHeader(CookieHeader)
|
|
if err != nil {
|
|
return logDebugAndReturnEmpty("failed to get request cookie : %v", err)
|
|
}
|
|
val := util.ExtractCookieValueByKey(cookie, rule.Key)
|
|
if val == "" {
|
|
return logDebugAndReturnEmpty("cookie key '%s' extracted from cookie '%s' is empty.", rule.Key, cookie)
|
|
}
|
|
return val, &rule, findMatchingItem(rule.LimitType, rule.ConfigItems, val)
|
|
// 根据客户端IP限流
|
|
case config.LimitByPerIpType:
|
|
realIp, err := getDownStreamIp(rule)
|
|
if err != nil {
|
|
log.Warnf("failed to get down stream ip: %v", err)
|
|
return "", &rule, nil
|
|
}
|
|
for _, item := range rule.ConfigItems {
|
|
if _, found, _ := item.IpNet.Get(realIp); !found {
|
|
continue
|
|
}
|
|
return realIp.String(), &rule, &item
|
|
}
|
|
}
|
|
return "", nil, nil
|
|
}
|
|
|
|
func logDebugAndReturnEmpty(errMsg string, args ...interface{}) (string, *config.LimitRuleItem, *config.LimitConfigItem) {
|
|
log.Debugf(errMsg, args...)
|
|
return "", nil, nil
|
|
}
|
|
|
|
func findMatchingItem(limitType config.LimitRuleItemType, items []config.LimitConfigItem, key string) *config.LimitConfigItem {
|
|
for _, item := range items {
|
|
// per类型,检查allType和regexpType
|
|
if limitType == config.LimitByPerHeaderType ||
|
|
limitType == config.LimitByPerParamType ||
|
|
limitType == config.LimitByPerConsumerType ||
|
|
limitType == config.LimitByPerCookieType {
|
|
if item.ConfigType == config.AllType || (item.ConfigType == config.RegexpType && item.Regexp.MatchString(key)) {
|
|
return &item
|
|
}
|
|
}
|
|
// 其他类型,直接比较key
|
|
if item.Key == key {
|
|
return &item
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func getDownStreamIp(rule config.LimitRuleItem) (net.IP, error) {
|
|
var (
|
|
realIpStr string
|
|
err error
|
|
)
|
|
if rule.LimitByPerIp.SourceType == config.HeaderSourceType {
|
|
realIpStr, err = proxywasm.GetHttpRequestHeader(rule.LimitByPerIp.HeaderName)
|
|
if err == nil {
|
|
realIpStr = strings.Split(strings.Trim(realIpStr, " "), ",")[0]
|
|
}
|
|
} else {
|
|
var bs []byte
|
|
bs, err = proxywasm.GetProperty([]string{"source", "address"})
|
|
realIpStr = string(bs)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ip := util.ParseIP(realIpStr)
|
|
realIP := net.ParseIP(ip)
|
|
if realIP == nil {
|
|
return nil, fmt.Errorf("invalid ip[%s]", ip)
|
|
}
|
|
return realIP, nil
|
|
}
|
|
|
|
func rejected(config config.ClusterKeyRateLimitConfig, context LimitContext) {
|
|
headers := make(map[string][]string)
|
|
headers[RateLimitResetHeader] = []string{strconv.Itoa(context.reset)}
|
|
if config.ShowLimitQuotaHeader {
|
|
headers[RateLimitLimitHeader] = []string{strconv.Itoa(context.count)}
|
|
headers[RateLimitRemainingHeader] = []string{strconv.Itoa(0)}
|
|
}
|
|
_ = proxywasm.SendHttpResponseWithDetail(
|
|
config.RejectedCode, "cluster-key-rate-limit.rejected", util.ReconvertHeaders(headers), []byte(config.RejectedMsg), -1)
|
|
}
|