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package server
import (
"fmt"
"io"
"net/http"
"github.com/containers/podman/v4/pkg/api/types"
"github.com/google/uuid"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"github.com/sirupsen/logrus"
)
// referenceIDHandler adds X-Reference-Id Header allowing event correlation
// and Apache style request logging
func referenceIDHandler() mux.MiddlewareFunc {
return func(h http.Handler) http.Handler {
// Only log Apache access_log-like entries at Info level or below
out := io.Discard
if logrus.IsLevelEnabled(logrus.InfoLevel) {
out = logrus.StandardLogger().Out
}
return handlers.CombinedLoggingHandler(out,
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
rid := r.Header.Get("X-Reference-Id")
if rid == "" {
if c := r.Context().Value(types.ConnKey); c == nil {
rid = uuid.New().String()
} else {
rid = fmt.Sprintf("%p", c)
}
}
r.Header.Set("X-Reference-Id", rid)
w.Header().Set("X-Reference-Id", rid)
h.ServeHTTP(w, r)
}))
}
}
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