82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
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// 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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"io/ioutil"
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"strconv"
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"strings"
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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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}
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func init() {
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Factories["conntrack"] = NewConntrackCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// conntrack stats
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func NewConntrackCollector() (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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}, nil
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}
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func (c *conntrackCollector) Update(ch chan<- prometheus.Metric) (err 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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// Conntrack probably not loaded into the kernel.
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return nil
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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 nil
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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 readUintFromFile(path string) (uint64, error) {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return 0, err
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}
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value, err := strconv.ParseUint(strings.TrimSpace(string(data)), 10, 64)
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if err != nil {
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return 0, err
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}
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return value, nil
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}
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