Log query requests in QFE before query execution (#6390)

* log query string in QFE before executing query request

Signed-off-by: Ahmed Hassan <afayekhassan@gmail.com>

* fix formatting

Signed-off-by: Ahmed Hassan <afayekhassan@gmail.com>

---------

Signed-off-by: Ahmed Hassan <afayekhassan@gmail.com>

pkg/frontend/transport/handler.go

@@ -225,16 +225,27 @@ func (f *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		r.Body = io.NopCloser(&buf)
 	}
 
+	// Log request
+	if f.cfg.QueryStatsEnabled {
+		queryString = f.parseRequestQueryString(r, buf)
+		logMessage := append([]interface{}{
+			"msg", "query request",
+			"component", "query-frontend",
+			"method", r.Method,
+			"path", r.URL.Path,
+		}, formatQueryString(queryString)...)
+		level.Info(util_log.WithContext(r.Context(), f.log)).Log(logMessage...)
+	}
+
 	startTime := time.Now()
 	resp, err := f.roundTripper.RoundTrip(r)
 	queryResponseTime := time.Since(startTime)
 
-	// Check whether we should parse the query string.
+	// Check if we need to parse the query string to avoid parsing twice.
 	shouldReportSlowQuery := f.cfg.LogQueriesLongerThan != 0 && queryResponseTime > f.cfg.LogQueriesLongerThan
-	if shouldReportSlowQuery || f.cfg.QueryStatsEnabled {
+	if shouldReportSlowQuery && !f.cfg.QueryStatsEnabled {
 		queryString = f.parseRequestQueryString(r, buf)
 	}
-
 	if shouldReportSlowQuery {
 		f.reportSlowQuery(r, queryString, queryResponseTime)
 	}