traefik/pkg/middlewares/inflightreq/inflight_req.go

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package inflightreq
import (
"context"
"fmt"
"net/http"
"github.com/opentracing/opentracing-go/ext"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/middlewares"
"github.com/traefik/traefik/v2/pkg/tracing"
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"github.com/vulcand/oxy/v2/connlimit"
)
const (
typeName = "InFlightReq"
)
type inFlightReq struct {
handler http.Handler
name string
}
// New creates a max request middleware.
// If no source criterion is provided in the config, it defaults to RequestHost.
func New(ctx context.Context, next http.Handler, config dynamic.InFlightReq, name string) (http.Handler, error) {
ctxLog := log.With(ctx, log.Str(log.MiddlewareName, name), log.Str(log.MiddlewareType, typeName))
log.FromContext(ctxLog).Debug("Creating middleware")
if config.SourceCriterion == nil ||
config.SourceCriterion.IPStrategy == nil &&
config.SourceCriterion.RequestHeaderName == "" && !config.SourceCriterion.RequestHost {
config.SourceCriterion = &dynamic.SourceCriterion{
RequestHost: true,
}
}
sourceMatcher, err := middlewares.GetSourceExtractor(ctxLog, config.SourceCriterion)
if err != nil {
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return nil, fmt.Errorf("error creating requests limiter: %w", err)
}
handler, err := connlimit.New(next, sourceMatcher, config.Amount)
if err != nil {
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return nil, fmt.Errorf("error creating connection limit: %w", err)
}
return &inFlightReq{handler: handler, name: name}, nil
}
func (i *inFlightReq) GetTracingInformation() (string, ext.SpanKindEnum) {
return i.name, tracing.SpanKindNoneEnum
}
func (i *inFlightReq) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
i.handler.ServeHTTP(rw, req)
}