Initila commit

collector/group.go

@@ -0,0 +1,31 @@
+package collector
+
+import (
+	"sync"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Group registers multiple device collectors as one Prometheus collector.
+// Collecting devices concurrently prevents one slow device from delaying all others.
+type Group []prometheus.Collector
+
+// Describe forwards descriptors from every registered device collector.
+func (group Group) Describe(channel chan<- *prometheus.Desc) {
+	for _, deviceCollector := range group {
+		deviceCollector.Describe(channel)
+	}
+}
+
+// Collect scrapes all configured devices concurrently.
+func (group Group) Collect(channel chan<- prometheus.Metric) {
+	var waitGroup sync.WaitGroup
+	waitGroup.Add(len(group))
+	for _, deviceCollector := range group {
+		go func(current prometheus.Collector) {
+			defer waitGroup.Done()
+			current.Collect(channel)
+		}(deviceCollector)
+	}
+	waitGroup.Wait()
+}