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ratelimit.go
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ratelimit.go
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/*
Package ratelimit provides filters to control the rate limitter settings on the route level.
For detailed documentation of the ratelimit, see https://godoc.org/github.com/zalando/skipper/ratelimit.
*/
package ratelimit
import (
"time"
"github.com/zalando/skipper/filters"
"github.com/zalando/skipper/ratelimit"
)
// RouteSettingsKey is used as key in the context state bag
const RouteSettingsKey = "#ratelimitsettings"
type spec struct {
typ ratelimit.Type
filterName string
}
type filter struct {
settings ratelimit.Settings
}
// NewLocalRatelimit creates a local measured rate limiting, that is
// only aware of itself. If you have 5 instances with 20 req/s, then
// it would allow 100 req/s to the backend from the same user. A third
// argument can be used to set which part of the request should be
// used to find the same user. Third argument defaults to
// XForwardedForLookuper, meaning X-Forwarded-For Header.
//
// Example:
//
// backendHealthcheck: Path("/healthcheck")
// -> localRatelimit(20, "1m")
// -> "https://foo.backend.net";
//
// Example rate limit per Authorization Header:
//
// login: Path("/login")
// -> localRatelimit(3, "1m", "auth")
// -> "https://login.backend.net";
func NewLocalRatelimit() filters.Spec {
return &spec{typ: ratelimit.LocalRatelimit, filterName: ratelimit.LocalRatelimitName}
}
// NewRatelimit creates a service rate limiting, that is
// only aware of itself. If you have 5 instances with 20 req/s, then
// it would at max allow 100 req/s to the backend.
//
// Example:
//
// backendHealthcheck: Path("/healthcheck")
// -> ratelimit(20, "1s")
// -> "https://foo.backend.net";
func NewRatelimit() filters.Spec {
return &spec{typ: ratelimit.ServiceRatelimit, filterName: ratelimit.ServiceRatelimitName}
}
// NewDisableRatelimit disables rate limiting
//
// Example:
//
// backendHealthcheck: Path("/healthcheck")
// -> disableRatelimit()
// -> "https://foo.backend.net";
func NewDisableRatelimit() filters.Spec {
return &spec{typ: ratelimit.DisableRatelimit, filterName: ratelimit.DisableRatelimitName}
}
func (s *spec) Name() string {
return s.filterName
}
func serviceRatelimitFilter(args []interface{}) (filters.Filter, error) {
if len(args) != 2 {
return nil, filters.ErrInvalidFilterParameters
}
var err error
var maxHits int
if len(args) > 0 {
maxHits, err = getIntArg(args[0])
if err != nil {
return nil, err
}
}
var timeWindow time.Duration
if len(args) > 1 {
timeWindow, err = getDurationArg(args[1])
if err != nil {
return nil, err
}
}
return &filter{
settings: ratelimit.Settings{
Type: ratelimit.ServiceRatelimit,
MaxHits: maxHits,
TimeWindow: timeWindow,
Lookuper: ratelimit.NewSameBucketLookuper(),
},
}, nil
}
func localRatelimitFilter(args []interface{}) (filters.Filter, error) {
if !(len(args) == 2 || len(args) == 3) {
return nil, filters.ErrInvalidFilterParameters
}
var err error
var maxHits int
if len(args) > 0 {
maxHits, err = getIntArg(args[0])
if err != nil {
return nil, err
}
}
var timeWindow time.Duration
if len(args) > 1 {
timeWindow, err = getDurationArg(args[1])
if err != nil {
return nil, err
}
}
var lookuper ratelimit.Lookuper
if len(args) > 2 {
lookuperName, err := getStringArg(args[2])
if err != nil {
return nil, err
}
switch lookuperName {
case "auth":
lookuper = ratelimit.NewAuthLookuper()
default:
lookuper = ratelimit.NewXForwardedForLookuper()
}
} else {
lookuper = ratelimit.NewXForwardedForLookuper()
}
return &filter{
settings: ratelimit.Settings{
Type: ratelimit.LocalRatelimit,
MaxHits: maxHits,
TimeWindow: timeWindow,
CleanInterval: 10 * timeWindow,
Lookuper: lookuper,
},
}, nil
}
func disableFilter(args []interface{}) (filters.Filter, error) {
return &filter{
settings: ratelimit.Settings{
Type: ratelimit.DisableRatelimit,
},
}, nil
}
func (s *spec) CreateFilter(args []interface{}) (filters.Filter, error) {
switch s.typ {
case ratelimit.ServiceRatelimit:
return serviceRatelimitFilter(args)
case ratelimit.LocalRatelimit:
return localRatelimitFilter(args)
default:
return disableFilter(args)
}
}
func getIntArg(a interface{}) (int, error) {
if i, ok := a.(int); ok {
return i, nil
}
if f, ok := a.(float64); ok {
return int(f), nil
}
return 0, filters.ErrInvalidFilterParameters
}
func getStringArg(a interface{}) (string, error) {
if s, ok := a.(string); ok {
return s, nil
}
return "", filters.ErrInvalidFilterParameters
}
func getDurationArg(a interface{}) (time.Duration, error) {
if s, ok := a.(string); ok {
return time.ParseDuration(s)
}
i, err := getIntArg(a)
return time.Duration(i) * time.Second, err
}
// Request stores the configured ratelimit.Settings in the state bag,
// such that it can be used in the proxy to check ratelimit.
func (f *filter) Request(ctx filters.FilterContext) {
ctx.StateBag()[RouteSettingsKey] = f.settings
}
func (f *filter) Response(filters.FilterContext) {}