Add collector for the top5 processes in %cpu

collectors/topprocsMetric.go

@@ -0,0 +1,39 @@
+package collectors
+
+import (
+	"fmt"
+	"log"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+const NUM_PROCS = 5
+
+type TopProcsCollector struct {
+	MetricCollector
+}
+
+func (m *TopProcsCollector) Init() {
+	m.name = "TopProcsCollector"
+	m.setup()
+}
+
+func (m *TopProcsCollector) Read(interval time.Duration) {
+	command := exec.Command("/usr/bin/ps", "-Ao", "comm", "--sort=-pcpu")
+	command.Wait()
+	stdout, err := command.Output()
+	if err != nil {
+		log.Print(m.name, err)
+		return
+	}
+
+	lines := strings.Split(string(stdout), "\n")
+	for i := 1; i < NUM_PROCS+1; i++ {
+		m.node[fmt.Sprintf("topproc%d", i)] = lines[i]
+	}
+}
+
+func (m *TopProcsCollector) Close() {
+	return
+}