package inflightreq import ( "context" "fmt" "net/http" "github.com/containous/traefik/v2/pkg/config/dynamic" "github.com/containous/traefik/v2/pkg/log" "github.com/containous/traefik/v2/pkg/middlewares" "github.com/containous/traefik/v2/pkg/tracing" "github.com/opentracing/opentracing-go/ext" "github.com/vulcand/oxy/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 { return nil, fmt.Errorf("error creating requests limiter: %w", err) } handler, err := connlimit.New(next, sourceMatcher, config.Amount) if err != nil { 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) }