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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !noconntrack
package collector
import (
"github.com/prometheus/client_golang/prometheus"
)
type conntrackCollector struct {
current *prometheus.Desc
limit *prometheus.Desc
}
func init() {
Factories["conntrack"] = NewConntrackCollector
}
// Takes a prometheus registry and returns a new Collector exposing
// conntrack stats
func NewConntrackCollector() (Collector, error) {
return &conntrackCollector{
current: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "nf_conntrack_entries"),
"Number of currently allocated flow entries for connection tracking.",
nil, nil,
),
limit: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "nf_conntrack_entries_limit"),
"Maximum size of connection tracking table.",
nil, nil,
),
}, nil
}
func (c *conntrackCollector) Update(ch chan<- prometheus.Metric) (err error) {
value, err := readUintFromFile(procFilePath("sys/net/netfilter/nf_conntrack_count"))
if err != nil {
// Conntrack probably not loaded into the kernel.
return nil
}
ch <- prometheus.MustNewConstMetric(
c.current, prometheus.GaugeValue, float64(value))
value, err = readUintFromFile(procFilePath("sys/net/netfilter/nf_conntrack_max"))
if err != nil {
return nil
}
ch <- prometheus.MustNewConstMetric(
c.limit, prometheus.GaugeValue, float64(value))
return nil
}
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