renaming plugins -> inputs

plugins/inputs/system/system.go

@@ -0,0 +1,74 @@
+package system
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+
+	"github.com/shirou/gopsutil/host"
+	"github.com/shirou/gopsutil/load"
+
+	"github.com/influxdb/telegraf/plugins/inputs"
+)
+
+type SystemStats struct{}
+
+func (_ *SystemStats) Description() string {
+	return "Read metrics about system load & uptime"
+}
+
+func (_ *SystemStats) SampleConfig() string { return "" }
+
+func (_ *SystemStats) Gather(acc inputs.Accumulator) error {
+	loadavg, err := load.LoadAvg()
+	if err != nil {
+		return err
+	}
+
+	hostinfo, err := host.HostInfo()
+	if err != nil {
+		return err
+	}
+
+	fields := map[string]interface{}{
+		"load1":         loadavg.Load1,
+		"load5":         loadavg.Load5,
+		"load15":        loadavg.Load15,
+		"uptime":        hostinfo.Uptime,
+		"uptime_format": format_uptime(hostinfo.Uptime),
+	}
+	acc.AddFields("system", fields, nil)
+
+	return nil
+}
+
+func format_uptime(uptime uint64) string {
+	buf := new(bytes.Buffer)
+	w := bufio.NewWriter(buf)
+
+	days := uptime / (60 * 60 * 24)
+
+	if days != 0 {
+		s := ""
+		if days > 1 {
+			s = "s"
+		}
+		fmt.Fprintf(w, "%d day%s, ", days, s)
+	}
+
+	minutes := uptime / 60
+	hours := minutes / 60
+	hours %= 24
+	minutes %= 60
+
+	fmt.Fprintf(w, "%2d:%02d", hours, minutes)
+
+	w.Flush()
+	return buf.String()
+}
+
+func init() {
+	inputs.Add("system", func() inputs.Input {
+		return &SystemStats{}
+	})
+}