113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
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// +build linux
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package ipvs
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import (
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"errors"
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"fmt"
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"math/bits"
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"strconv"
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"syscall"
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"github.com/docker/libnetwork/ipvs"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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// IPVS holds the state for this input plugin
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type IPVS struct {
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handle *ipvs.Handle
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}
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// Description returns a description string
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func (i *IPVS) Description() string {
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return "Collect virtual and real server stats from Linux IPVS"
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}
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// SampleConfig returns a sample configuration for this input plugin
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func (i *IPVS) SampleConfig() string {
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return ``
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}
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// Gather gathers the stats
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func (i *IPVS) Gather(acc telegraf.Accumulator) error {
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if i.handle == nil {
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h, err := ipvs.New("") // TODO: make the namespace configurable
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if err != nil {
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return errors.New("Unable to open IPVS handle")
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}
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i.handle = h
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}
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services, err := i.handle.GetServices()
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if err != nil {
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i.handle.Close()
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i.handle = nil // trigger a reopen on next call to gather
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return errors.New("Failed to list IPVS services")
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}
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for _, s := range services {
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fields := map[string]interface{}{
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"connections": s.Stats.Connections,
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"pkts_in": s.Stats.PacketsIn,
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"pkts_out": s.Stats.PacketsOut,
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"bytes_in": s.Stats.BytesIn,
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"bytes_out": s.Stats.BytesOut,
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"pps_in": s.Stats.PPSIn,
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"pps_out": s.Stats.PPSOut,
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"cps": s.Stats.CPS,
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}
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acc.AddGauge("ipvs_virtual_server", fields, serviceTags(s))
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}
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return nil
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}
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// helper: given a Service, return tags that identify it
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func serviceTags(s *ipvs.Service) map[string]string {
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ret := map[string]string{
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"sched": s.SchedName,
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"netmask": fmt.Sprintf("%d", bits.OnesCount32(s.Netmask)),
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"address_family": addressFamilyToString(s.AddressFamily),
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}
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// Per the ipvsadm man page, a virtual service is defined "based on
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// protocol/addr/port or firewall mark"
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if s.FWMark > 0 {
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ret["fwmark"] = strconv.Itoa(int(s.FWMark))
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} else {
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ret["protocol"] = protocolToString(s.Protocol)
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ret["address"] = s.Address.String()
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ret["port"] = strconv.Itoa(int(s.Port))
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}
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return ret
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}
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// helper: convert protocol uint16 to human readable string (if possible)
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func protocolToString(p uint16) string {
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switch p {
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case syscall.IPPROTO_TCP:
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return "tcp"
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case syscall.IPPROTO_UDP:
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return "udp"
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case syscall.IPPROTO_SCTP:
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return "sctp"
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default:
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return fmt.Sprintf("%d", p)
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}
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}
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// helper: convert addressFamily to a human readable string
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func addressFamilyToString(af uint16) string {
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switch af {
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case syscall.AF_INET:
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return "inet"
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case syscall.AF_INET6:
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return "inet6"
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default:
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return fmt.Sprintf("%d", af)
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}
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}
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func init() {
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inputs.Add("ipvs", func() telegraf.Input { return &IPVS{} })
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}
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