138 lines
3.3 KiB
Go
138 lines
3.3 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package ratelimit
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import (
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"fmt"
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extensions "k8s.io/api/extensions/v1beta1"
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"k8s.io/ingress/core/pkg/ingress/annotations/parser"
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)
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const (
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limitIP = "ingress.kubernetes.io/limit-connections"
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limitRPS = "ingress.kubernetes.io/limit-rps"
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// allow 5 times the specified limit as burst
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defBurst = 5
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// 1MB -> 16 thousand 64-byte states or about 8 thousand 128-byte states
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// default is 5MB
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defSharedSize = 5
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)
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// RateLimit returns rate limit configuration for an Ingress rule limiting the
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// number of connections per IP address and/or connections per second.
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// If you both annotations are specified in a single Ingress rule, RPS limits
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// takes precedence
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type RateLimit struct {
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// Connections indicates a limit with the number of connections per IP address
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Connections Zone `json:"connections"`
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// RPS indicates a limit with the number of connections per second
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RPS Zone `json:"rps"`
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}
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func (rt1 *RateLimit) Equal(rt2 *RateLimit) bool {
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if rt1 == rt2 {
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return true
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}
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if rt1 == nil || rt2 == nil {
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return false
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}
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if !(&rt1.Connections).Equal(&rt2.Connections) {
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return false
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}
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if !(&rt1.RPS).Equal(&rt2.RPS) {
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return false
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}
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return true
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}
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// Zone returns information about the NGINX rate limit (limit_req_zone)
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// http://nginx.org/en/docs/http/ngx_http_limit_req_module.html#limit_req_zone
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type Zone struct {
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Name string `json:"name"`
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Limit int `json:"limit"`
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Burst int `json:"burst"`
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// SharedSize amount of shared memory for the zone
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SharedSize int `json:"sharedSize"`
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}
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func (z1 *Zone) Equal(z2 *Zone) bool {
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if z1 == z2 {
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return true
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}
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if z1 == nil || z2 == nil {
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return false
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}
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if z1.Name != z2.Name {
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return false
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}
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if z1.Limit != z2.Limit {
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return false
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}
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if z1.Burst != z2.Burst {
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return false
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}
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if z1.SharedSize != z2.SharedSize {
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return false
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}
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return true
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}
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type ratelimit struct {
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}
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// NewParser creates a new ratelimit annotation parser
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func NewParser() parser.IngressAnnotation {
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return ratelimit{}
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}
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// ParseAnnotations parses the annotations contained in the ingress
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// rule used to rewrite the defined paths
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func (a ratelimit) Parse(ing *extensions.Ingress) (interface{}, error) {
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rps, _ := parser.GetIntAnnotation(limitRPS, ing)
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conn, _ := parser.GetIntAnnotation(limitIP, ing)
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if rps == 0 && conn == 0 {
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return &RateLimit{
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Connections: Zone{},
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RPS: Zone{},
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}, nil
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}
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zoneName := fmt.Sprintf("%v_%v", ing.GetNamespace(), ing.GetName())
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return &RateLimit{
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Connections: Zone{
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Name: fmt.Sprintf("%v_conn", zoneName),
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Limit: conn,
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Burst: conn * defBurst,
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SharedSize: defSharedSize,
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},
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RPS: Zone{
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Name: fmt.Sprintf("%v_rps", zoneName),
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Limit: rps,
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Burst: rps * defBurst,
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SharedSize: defSharedSize,
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},
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}, nil
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}
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