traefik/pkg/middlewares/ratelimiter/rate_limiter.go

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package ratelimiter
import (
"context"
"net/http"
"time"
"github.com/containous/traefik/pkg/config/dynamic"
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"github.com/containous/traefik/pkg/middlewares"
"github.com/containous/traefik/pkg/tracing"
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"github.com/opentracing/opentracing-go/ext"
"github.com/vulcand/oxy/ratelimit"
"github.com/vulcand/oxy/utils"
)
const (
typeName = "RateLimiterType"
)
type rateLimiter struct {
handler http.Handler
name string
}
// New creates rate limiter middleware.
func New(ctx context.Context, next http.Handler, config dynamic.RateLimit, name string) (http.Handler, error) {
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middlewares.GetLogger(ctx, name, typeName).Debug("Creating middleware")
extractFunc, err := utils.NewExtractor(config.ExtractorFunc)
if err != nil {
return nil, err
}
rateSet := ratelimit.NewRateSet()
for _, rate := range config.RateSet {
if err = rateSet.Add(time.Duration(rate.Period), rate.Average, rate.Burst); err != nil {
return nil, err
}
}
rl, err := ratelimit.New(next, extractFunc, rateSet)
if err != nil {
return nil, err
}
return &rateLimiter{handler: rl, name: name}, nil
}
func (r *rateLimiter) GetTracingInformation() (string, ext.SpanKindEnum) {
return r.name, tracing.SpanKindNoneEnum
}
func (r *rateLimiter) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
r.handler.ServeHTTP(rw, req)
}