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code_middleware.go
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/
code_middleware.go
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package middleware
import (
"net/http"
"strconv"
"github.com/gorilla/mux"
"github.com/kyma-project/kyma/components/application-registry/internal/monitoring/collector"
"github.com/sirupsen/logrus"
)
type Middleware interface {
Handle(next http.Handler) http.Handler
}
type codeMiddleware struct {
metricsCollector collector.Collector
}
func NewCodeMiddleware(metricsCollector collector.Collector) *codeMiddleware {
return &codeMiddleware{metricsCollector: metricsCollector}
}
func (cm *codeMiddleware) Handle(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
writerWrapper := newResponseWriterWrapper(w)
next.ServeHTTP(writerWrapper, r)
route := mux.CurrentRoute(r)
if route == nil {
logrus.Warnf("No route matched '%s' for request tracking", r.RequestURI)
return
}
template, err := route.GetPathTemplate()
if err != nil {
logrus.Errorf("Getting path template failed, %s", err.Error())
} else {
statusLabel := strconv.FormatInt(int64(writerWrapper.statusCode), 10)
cm.metricsCollector.AddObservation(1, template, statusLabel, r.Method)
}
})
}