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backendratelimit.go
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/
backendratelimit.go
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package ratelimit
import (
"net/http"
"github.com/zalando/skipper/filters"
"github.com/zalando/skipper/ratelimit"
)
type BackendRatelimit struct {
Settings ratelimit.Settings
StatusCode int
}
// NewBackendRatelimit creates a filter Spec, whose instances
// instruct proxy to limit request rate towards a particular backend endpoint
func NewBackendRatelimit() filters.Spec { return &BackendRatelimit{} }
func (*BackendRatelimit) Name() string {
return filters.BackendRateLimitName
}
func (*BackendRatelimit) CreateFilter(args []interface{}) (filters.Filter, error) {
if len(args) != 3 && len(args) != 4 {
return nil, filters.ErrInvalidFilterParameters
}
group, err := getStringArg(args[0])
if err != nil {
return nil, err
}
maxHits, err := getIntArg(args[1])
if err != nil {
return nil, err
}
timeWindow, err := getDurationArg(args[2])
if err != nil {
return nil, err
}
f := &BackendRatelimit{
Settings: ratelimit.Settings{
Type: ratelimit.ClusterServiceRatelimit,
Group: "backend." + group,
MaxHits: maxHits,
TimeWindow: timeWindow,
},
StatusCode: http.StatusServiceUnavailable,
}
if len(args) == 4 {
code, err := getIntArg(args[3])
if err != nil {
return nil, err
}
f.StatusCode = code
}
return f, nil
}
func (limit *BackendRatelimit) Request(ctx filters.FilterContext) {
// allows overwrite
ctx.StateBag()[filters.BackendRatelimit] = limit
}
func (*BackendRatelimit) Response(filters.FilterContext) {}