Validating metric name before writing to cache

Signed-off-by: Madalina Lazar <madalina.lazar@intel.com>

Author: madalazar

telemetry-aware-scheduling/pkg/cache/autoupdating.go

@@ -20,7 +20,10 @@ const (
 	l2                = 2
 )
 
-var errNull = errors.New("")
+var (
+	errNull              = errors.New("")
+	errInvalidMetricName = errors.New("invalid metric name")
+)
 
 // AutoUpdatingCache holds a map of metrics of interest with their associated NodeMetricsInfo object.
 type AutoUpdatingCache struct {
@@ -119,6 +122,12 @@ func (n *AutoUpdatingCache) WritePolicy(namespace string, policyName string, pol
 // It also increments a counter showing how many strategies are using the metric -
 // protecting it from deletion until there are no more associated strategies.
 func (n *AutoUpdatingCache) WriteMetric(metricName string, data metrics.NodeMetricsInfo) error {
+	if len(metricName) == 0 {
+		klog.V(l2).ErrorS(errInvalidMetricName, "Failed to write metric with metric name: "+metricName, "component", "controller")
+
+		return errInvalidMetricName
+	}
+
 	payload := nilPayloadCheck(data)
 	n.add(fmt.Sprintf(metricPath, metricName), payload)
 

telemetry-aware-scheduling/pkg/cache/autoupdating_test.go

@@ -201,6 +201,7 @@ func TestNodeMetricsCache_WriteMetric(t *testing.T) {
 		{"false name queried", MockEmptySelfUpdatingCache(), "memory_free", args{"memoryFREE"}, true},
 		{"number queried", MockEmptySelfUpdatingCache(), "1", args{"memoryFREE"}, true},
 		{"add existing metric", MockEmptySelfUpdatingCache(), "dummyMetric1", args{"dummyMetric1"}, false},
+		{"empty metric name", MockEmptySelfUpdatingCache(), "", args{""}, true},
 	}
 	for _, tt := range tests {
 		tt := tt