mikrotik-exporter/collector/dhcp_collector.go

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package collector
import (
"fmt"
"strconv"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
)
type dhcpCollector struct {
leasesActiveCountDesc *prometheus.Desc
}
func (c *dhcpCollector) init() {
const prefix = "dhcp"
labelNames := []string{"name", "address", "server"}
c.leasesActiveCountDesc = description(prefix, "leases_active_count", "number of active leases per DHCP server", labelNames)
}
func newDHCPCollector() routerOSCollector {
c := &dhcpCollector{}
c.init()
return c
}
func (c *dhcpCollector) describe(ch chan<- *prometheus.Desc) {
ch <- c.leasesActiveCountDesc
}
func (c *dhcpCollector) collect(ctx *collectorContext) error {
names, err := c.fetchDHCPServerNames(ctx)
if err != nil {
return err
}
for _, n := range names {
err := c.colllectForDHCPServer(ctx, n)
if err != nil {
return err
}
}
return nil
}
func (c *dhcpCollector) fetchDHCPServerNames(ctx *collectorContext) ([]string, error) {
reply, err := ctx.client.Run("/ip/dhcp-server/print", "=.proplist=name")
if err != nil {
log.WithFields(log.Fields{
"device": ctx.device.Name,
"error": err,
}).Error("error fetching DHCP server names")
return nil, err
}
names := []string{}
for _, re := range reply.Re {
names = append(names, re.Map["name"])
}
return names, nil
}
func (c *dhcpCollector) colllectForDHCPServer(ctx *collectorContext, dhcpServer string) error {
reply, err := ctx.client.Run("/ip/dhcp-server/lease/print", fmt.Sprintf("?server=%s", dhcpServer), "=active=", "=count-only=")
if err != nil {
log.WithFields(log.Fields{
"dhcp_server": dhcpServer,
"device": ctx.device.Name,
"error": err,
}).Error("error fetching DHCP lease counts")
return err
}
if reply.Done.Map["ret"] == "" {
return nil
}
v, err := strconv.ParseFloat(reply.Done.Map["ret"], 32)
if err != nil {
log.WithFields(log.Fields{
"dhcp_server": dhcpServer,
"device": ctx.device.Name,
"error": err,
}).Error("error parsing DHCP lease counts")
return err
}
ctx.ch <- prometheus.MustNewConstMetric(c.leasesActiveCountDesc, prometheus.GaugeValue, v, ctx.device.Name, ctx.device.Address, dhcpServer)
return nil
}