mirror of
https://github.com/alibaba/higress.git
synced 2026-03-07 01:50:51 +08:00
111 lines
2.9 KiB
Go
111 lines
2.9 KiB
Go
// Copyright (c) 2022 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 annotations
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import (
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types "github.com/gogo/protobuf/types"
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networking "istio.io/api/networking/v1alpha3"
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"istio.io/istio/pilot/pkg/networking/core/v1alpha3/mseingress"
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)
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const (
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limitRPM = "route-limit-rpm"
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limitRPS = "route-limit-rps"
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limitBurstMultiplier = "route-limit-burst-multiplier"
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defaultBurstMultiplier = 5
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defaultStatusCode = 429
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)
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var (
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_ Parser = localRateLimit{}
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_ RouteHandler = localRateLimit{}
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second = &types.Duration{
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Seconds: 1,
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}
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minute = &types.Duration{
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Seconds: 60,
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}
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)
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type localRateLimitConfig struct {
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TokensPerFill uint32
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MaxTokens uint32
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FillInterval *types.Duration
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}
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type localRateLimit struct{}
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func (l localRateLimit) Parse(annotations Annotations, config *Ingress, _ *GlobalContext) error {
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if !needLocalRateLimitConfig(annotations) {
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return nil
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}
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var local *localRateLimitConfig
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defer func() {
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config.localRateLimit = local
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}()
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multiplier := defaultBurstMultiplier
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if m, err := annotations.ParseIntForHigress(limitBurstMultiplier); err == nil {
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multiplier = m
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}
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if rpm, err := annotations.ParseIntForHigress(limitRPM); err == nil {
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local = &localRateLimitConfig{
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MaxTokens: uint32(rpm * multiplier),
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TokensPerFill: uint32(rpm),
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FillInterval: minute,
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}
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} else if rps, err := annotations.ParseIntForHigress(limitRPS); err == nil {
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local = &localRateLimitConfig{
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MaxTokens: uint32(rps * multiplier),
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TokensPerFill: uint32(rps),
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FillInterval: second,
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}
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}
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return nil
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}
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func (l localRateLimit) ApplyRoute(route *networking.HTTPRoute, config *Ingress) {
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localRateLimitConfig := config.localRateLimit
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if localRateLimitConfig == nil {
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return
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}
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route.RouteHTTPFilters = append(route.RouteHTTPFilters, &networking.HTTPFilter{
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Name: mseingress.LocalRateLimit,
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Filter: &networking.HTTPFilter_LocalRateLimit{
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LocalRateLimit: &networking.LocalRateLimit{
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TokenBucket: &networking.TokenBucket{
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MaxTokens: localRateLimitConfig.MaxTokens,
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TokensPefFill: localRateLimitConfig.TokensPerFill,
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FillInterval: localRateLimitConfig.FillInterval,
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},
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StatusCode: defaultStatusCode,
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},
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},
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})
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}
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func needLocalRateLimitConfig(annotations Annotations) bool {
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return annotations.HasHigress(limitRPM) ||
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annotations.HasHigress(limitRPS)
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}
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