Add simpler collectors for load, mem_used and network

collectors/netstatMetric.go

@@ -0,0 +1,59 @@
+package collectors
+
+import (
+	"io/ioutil"
+	"strconv"
+	"strings"
+	"time"
+	"log"
+)
+
+const NETSTATFILE = `/proc/net/dev`
+
+type NetstatCollector struct {
+	MetricCollector
+}
+
+
+func (m *NetstatCollector) Init() {
+    m.name = "NetstatCollector"
+	m.setup()
+}
+
+func (m *NetstatCollector) Read(interval time.Duration){
+	data, err := ioutil.ReadFile(string(NETSTATFILE))
+	if err != nil {
+		log.Print(err.Error())
+		return
+	}
+	var matches = map[int]string{
+		1:  "bytes_in",
+		9:  "bytes_out",
+		2:  "pkts_in",
+		10: "pkts_out",
+	}
+
+	lines := strings.Split(string(data), "\n")
+	for _, l := range lines {
+		if !strings.Contains(l, ":") {
+			continue
+		}
+		f := strings.Fields(l)
+		dev := f[0][0 : len(f[0])-1]
+		if dev == "lo" {
+			continue
+		}
+		for i, name := range matches {
+			v, err := strconv.ParseInt(f[i], 10, 0)
+			if err == nil {
+				
+				m.node[name] = float64(v) * 1.0e-3
+			}
+		}
+	}
+	
+}
+
+func (m *NetstatCollector) Close() {
+    return
+}