Add simpler collectors for load, mem_used and network

collectors/memstatMetric.go

@@ -0,0 +1,57 @@
+package collectors
+
+import (
+	"errors"
+	"io/ioutil"
+	"log"
+	"strconv"
+	"strings"
+	"time"
+
+	//protocol "github.com/influxdata/line-protocol"
+)
+
+const MEMSTATFILE = `/proc/meminfo`
+
+type MemstatCollector struct {
+	MetricCollector
+}
+
+
+func (m *MemstatCollector) Init() {
+    m.name = "MemstatCollector"
+	m.setup()
+}
+
+func (m *MemstatCollector) Read(interval time.Duration){
+	buffer, err := ioutil.ReadFile(string(MEMSTATFILE))
+
+	if err != nil {
+		log.Print(err)
+		return
+	}
+
+	ll := strings.Split(string(buffer), "\n")
+	memstats := make(map[string]int64)
+
+	for _, line := range ll {
+		ls := strings.Split(line, `:`)
+		if len(ls) > 1 {
+			lv := strings.Fields(ls[1])
+			memstats[ls[0]], err = strconv.ParseInt(lv[0], 0, 64)
+		}
+	}
+
+	if _, exists := memstats[`MemTotal`]; !exists {
+		err = errors.New("Parse error")
+		log.Print(err)
+		return
+	}
+
+	memUsed := memstats[`MemTotal`] - (memstats[`MemFree`] + memstats[`Buffers`] + memstats[`Cached`])
+	m.node["mem_used"] = float64(memUsed) * 1.0e-3
+}
+
+func (m *MemstatCollector) Close() {
+    return
+}