cc-metric-collector/collectors/netstatMetric.go

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package collectors
import (
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"encoding/json"
"io/ioutil"
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"log"
"strconv"
"strings"
"time"
lp "github.com/influxdata/line-protocol"
)
const NETSTATFILE = `/proc/net/dev`
type NetstatCollectorConfig struct {
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ExcludeDevices []string `json:"exclude_devices"`
}
type NetstatCollector struct {
MetricCollector
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config NetstatCollectorConfig
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matches map[int]string
}
func (m *NetstatCollector) Init(config []byte) error {
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m.name = "NetstatCollector"
m.setup()
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m.matches = map[int]string{
1: "bytes_in",
9: "bytes_out",
2: "pkts_in",
10: "pkts_out",
}
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if len(config) > 0 {
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err := json.Unmarshal(config, &m.config)
if err != nil {
log.Print(err.Error())
return err
}
}
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_, err := ioutil.ReadFile(string(NETSTATFILE))
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if err == nil {
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m.init = true
}
return nil
}
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func (m *NetstatCollector) Read(interval time.Duration, out *[]lp.MutableMetric) {
data, err := ioutil.ReadFile(string(NETSTATFILE))
if err != nil {
log.Print(err.Error())
return
}
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]
cont := false
for _, d := range m.config.ExcludeDevices {
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if d == dev {
cont = true
}
}
if cont {
continue
}
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tags := map[string]string{"device": dev, "type": "node"}
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for i, name := range m.matches {
v, err := strconv.ParseInt(f[i], 10, 0)
if err == nil {
y, err := lp.New(name, tags, map[string]interface{}{"value": int(float64(v) * 1.0e-3)}, time.Now())
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if err == nil {
*out = append(*out, y)
}
}
}
}
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}
func (m *NetstatCollector) Close() {
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m.init = false
}