node_exporter/collector/bonding.go

95 lines
2.4 KiB
Go

// +build !nobonding
package collector
import (
"fmt"
"io/ioutil"
"os"
"path"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
const (
sysfsNet = "/sys/class/net"
)
type bondingCollector struct {
slaves, active *prometheus.GaugeVec
}
func init() {
Factories["bonding"] = NewBondingCollector
}
// NewBondingCollector returns a newly allocated bondingCollector.
// It exposes the number of configured and active slave of linux bonding interfaces.
func NewBondingCollector(config Config) (Collector, error) {
return &bondingCollector{
slaves: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Name: "net_bonding_slaves",
Help: "Number of configured slaves per bonding interface.",
},
[]string{"master"},
),
active: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Name: "net_bonding_slaves_active",
Help: "Number of active slaves per bonding interface.",
},
[]string{"master"},
),
}, nil
}
// Update reads and exposes bonding states, implements Collector interface. Caution: This works only on linux.
func (c *bondingCollector) Update(ch chan<- prometheus.Metric) (err error) {
bondingStats, err := readBondingStats(sysfsNet)
if err != nil {
return err
}
for master, status := range bondingStats {
c.slaves.WithLabelValues(master).Set(float64(status[0]))
c.active.WithLabelValues(master).Set(float64(status[1]))
}
c.slaves.Collect(ch)
c.active.Collect(ch)
return nil
}
func readBondingStats(root string) (status map[string][2]int, err error) {
status = map[string][2]int{}
masters, err := ioutil.ReadFile(path.Join(root, "bonding_masters"))
if err != nil {
return nil, err
}
for _, master := range strings.Fields(string(masters)) {
slaves, err := ioutil.ReadFile(path.Join(root, master, "bonding", "slaves"))
if err != nil {
return nil, err
}
sstat := [2]int{0, 0}
for _, slave := range strings.Fields(string(slaves)) {
state, err := ioutil.ReadFile(path.Join(root, master, fmt.Sprintf("lower_%s", slave), "operstate"))
if os.IsNotExist(err) {
// some older? kernels use slave_ prefix
state, err = ioutil.ReadFile(path.Join(root, master, fmt.Sprintf("slave_%s", slave), "operstate"))
}
if err != nil {
return nil, err
}
sstat[0]++
if strings.TrimSpace(string(state)) == "up" {
sstat[1]++
}
}
status[master] = sstat
}
return status, err
}