Return list of parsed metrics, for autodiscovery.

internal/application/api_responder.go

@@ -1,16 +1,33 @@
 package application
 
 import (
+	"encoding/json"
+
 	"go.dev.pztrn.name/metricator/internal/models"
 )
 
 // Responds with needed data. First parameter is a type of data needed (like metric name),
 // second parameter is actual metric name. Second parameter also can be empty.
 func (a *Application) respond(rInfo *models.RequestInfo) string {
-	metric, err := a.storage.Get(rInfo.Metric)
+	// If metric was requested - return only it.
+	if rInfo.Metric != "" {
+		metric, err := a.storage.Get(rInfo.Metric)
+		if err != nil {
+			return ""
+		}
+
+		return metric.GetValue()
+	}
+
+	// Otherwise we should get all metrics as slice and return them as string.
+	// This is needed for metrics autodiscovery.
+	metrics := a.storage.GetAsSlice()
+
+	metricsBytes, err := json.Marshal(metrics)
 	if err != nil {
+		// ToDo: log error
 		return ""
 	}
 
-	return metric.GetValue()
+	return string(metricsBytes)
 }