mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-09-19 23:57:30 -07:00
80 lines
2.3 KiB
Go
80 lines
2.3 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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// +build !noconntrack
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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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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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)
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type conntrackCollector struct {
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current *prometheus.Desc
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limit *prometheus.Desc
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logger log.Logger
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}
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func init() {
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registerCollector("conntrack", defaultEnabled, NewConntrackCollector)
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}
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// NewConntrackCollector returns a new Collector exposing conntrack stats.
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func NewConntrackCollector(logger log.Logger) (Collector, error) {
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return &conntrackCollector{
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current: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "nf_conntrack_entries"),
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"Number of currently allocated flow entries for connection tracking.",
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nil, nil,
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),
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limit: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "nf_conntrack_entries_limit"),
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"Maximum size of connection tracking table.",
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nil, nil,
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),
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logger: logger,
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}, nil
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}
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func (c *conntrackCollector) Update(ch chan<- prometheus.Metric) error {
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value, err := readUintFromFile(procFilePath("sys/net/netfilter/nf_conntrack_count"))
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if err != nil {
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return c.handleErr(err)
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}
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ch <- prometheus.MustNewConstMetric(
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c.current, prometheus.GaugeValue, float64(value))
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value, err = readUintFromFile(procFilePath("sys/net/netfilter/nf_conntrack_max"))
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if err != nil {
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return c.handleErr(err)
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}
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ch <- prometheus.MustNewConstMetric(
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c.limit, prometheus.GaugeValue, float64(value))
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return nil
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}
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func (c *conntrackCollector) handleErr(err error) error {
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if errors.Is(err, os.ErrNotExist) {
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level.Debug(c.logger).Log("msg", "conntrack probably not loaded")
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return ErrNoData
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}
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return fmt.Errorf("failed to retrieve conntrack stats: %w", err)
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}
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