mirror of
https://github.com/prometheus/node_exporter
synced 2024-12-11 17:06:04 +00:00
233 lines
7.4 KiB
Go
233 lines
7.4 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !noipvs
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// +build !noipvs
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package collector
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import (
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"errors"
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"fmt"
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"os"
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"sort"
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"strconv"
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"strings"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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kingpin "gopkg.in/alecthomas/kingpin.v2"
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)
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type ipvsCollector struct {
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Collector
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fs procfs.FS
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backendLabels []string
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backendConnectionsActive, backendConnectionsInact, backendWeight typedDesc
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connections, incomingPackets, outgoingPackets, incomingBytes, outgoingBytes typedDesc
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logger log.Logger
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}
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type ipvsBackendStatus struct {
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ActiveConn uint64
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InactConn uint64
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Weight uint64
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}
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const (
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ipvsLabelLocalAddress = "local_address"
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ipvsLabelLocalPort = "local_port"
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ipvsLabelRemoteAddress = "remote_address"
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ipvsLabelRemotePort = "remote_port"
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ipvsLabelProto = "proto"
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ipvsLabelLocalMark = "local_mark"
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)
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var (
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fullIpvsBackendLabels = []string{
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ipvsLabelLocalAddress,
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ipvsLabelLocalPort,
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ipvsLabelRemoteAddress,
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ipvsLabelRemotePort,
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ipvsLabelProto,
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ipvsLabelLocalMark,
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}
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ipvsLabels = kingpin.Flag("collector.ipvs.backend-labels", "Comma separated list for IPVS backend stats labels.").Default(strings.Join(fullIpvsBackendLabels, ",")).String()
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)
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func init() {
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registerCollector("ipvs", defaultEnabled, NewIPVSCollector)
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}
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// NewIPVSCollector sets up a new collector for IPVS metrics. It accepts the
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// "procfs" config parameter to override the default proc location (/proc).
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func NewIPVSCollector(logger log.Logger) (Collector, error) {
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return newIPVSCollector(logger)
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}
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func newIPVSCollector(logger log.Logger) (*ipvsCollector, error) {
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var (
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c ipvsCollector
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err error
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subsystem = "ipvs"
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)
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if c.backendLabels, err = c.parseIpvsLabels(*ipvsLabels); err != nil {
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return nil, err
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}
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c.logger = logger
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c.fs, err = procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open procfs: %w", err)
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}
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c.connections = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "connections_total"),
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"The total number of connections made.",
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nil, nil,
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), prometheus.CounterValue}
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c.incomingPackets = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "incoming_packets_total"),
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"The total number of incoming packets.",
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nil, nil,
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), prometheus.CounterValue}
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c.outgoingPackets = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "outgoing_packets_total"),
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"The total number of outgoing packets.",
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nil, nil,
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), prometheus.CounterValue}
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c.incomingBytes = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "incoming_bytes_total"),
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"The total amount of incoming data.",
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nil, nil,
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), prometheus.CounterValue}
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c.outgoingBytes = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "outgoing_bytes_total"),
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"The total amount of outgoing data.",
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nil, nil,
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), prometheus.CounterValue}
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c.backendConnectionsActive = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "backend_connections_active"),
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"The current active connections by local and remote address.",
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c.backendLabels, nil,
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), prometheus.GaugeValue}
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c.backendConnectionsInact = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "backend_connections_inactive"),
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"The current inactive connections by local and remote address.",
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c.backendLabels, nil,
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), prometheus.GaugeValue}
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c.backendWeight = typedDesc{prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "backend_weight"),
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"The current backend weight by local and remote address.",
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c.backendLabels, nil,
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), prometheus.GaugeValue}
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return &c, nil
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}
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func (c *ipvsCollector) Update(ch chan<- prometheus.Metric) error {
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ipvsStats, err := c.fs.IPVSStats()
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if err != nil {
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// Cannot access ipvs metrics, report no error.
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if errors.Is(err, os.ErrNotExist) {
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level.Debug(c.logger).Log("msg", "ipvs collector metrics are not available for this system")
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return ErrNoData
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}
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return fmt.Errorf("could not get IPVS stats: %w", err)
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}
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ch <- c.connections.mustNewConstMetric(float64(ipvsStats.Connections))
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ch <- c.incomingPackets.mustNewConstMetric(float64(ipvsStats.IncomingPackets))
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ch <- c.outgoingPackets.mustNewConstMetric(float64(ipvsStats.OutgoingPackets))
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ch <- c.incomingBytes.mustNewConstMetric(float64(ipvsStats.IncomingBytes))
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ch <- c.outgoingBytes.mustNewConstMetric(float64(ipvsStats.OutgoingBytes))
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backendStats, err := c.fs.IPVSBackendStatus()
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if err != nil {
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return fmt.Errorf("could not get backend status: %w", err)
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}
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sums := map[string]ipvsBackendStatus{}
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labelValues := map[string][]string{}
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for _, backend := range backendStats {
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localAddress := ""
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if backend.LocalAddress.String() != "<nil>" {
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localAddress = backend.LocalAddress.String()
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}
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kv := make([]string, len(c.backendLabels))
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for i, label := range c.backendLabels {
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var labelValue string
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switch label {
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case ipvsLabelLocalAddress:
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labelValue = localAddress
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case ipvsLabelLocalPort:
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labelValue = strconv.FormatUint(uint64(backend.LocalPort), 10)
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case ipvsLabelRemoteAddress:
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labelValue = backend.RemoteAddress.String()
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case ipvsLabelRemotePort:
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labelValue = strconv.FormatUint(uint64(backend.RemotePort), 10)
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case ipvsLabelProto:
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labelValue = backend.Proto
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case ipvsLabelLocalMark:
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labelValue = backend.LocalMark
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}
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kv[i] = labelValue
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}
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key := strings.Join(kv, "-")
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status := sums[key]
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status.ActiveConn += backend.ActiveConn
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status.InactConn += backend.InactConn
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status.Weight += backend.Weight
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sums[key] = status
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labelValues[key] = kv
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}
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for key, status := range sums {
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kv := labelValues[key]
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ch <- c.backendConnectionsActive.mustNewConstMetric(float64(status.ActiveConn), kv...)
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ch <- c.backendConnectionsInact.mustNewConstMetric(float64(status.InactConn), kv...)
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ch <- c.backendWeight.mustNewConstMetric(float64(status.Weight), kv...)
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}
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return nil
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}
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func (c *ipvsCollector) parseIpvsLabels(labelString string) ([]string, error) {
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labels := strings.Split(labelString, ",")
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labelSet := make(map[string]bool, len(labels))
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results := make([]string, 0, len(labels))
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for _, label := range labels {
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if label != "" {
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labelSet[label] = true
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}
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}
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for _, label := range fullIpvsBackendLabels {
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if labelSet[label] {
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results = append(results, label)
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}
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delete(labelSet, label)
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}
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if len(labelSet) > 0 {
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keys := make([]string, 0, len(labelSet))
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for label := range labelSet {
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keys = append(keys, label)
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}
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sort.Strings(keys)
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return nil, fmt.Errorf("unknown IPVS backend labels: %q", strings.Join(keys, ", "))
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}
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return results, nil
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}
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