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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 !nosockstat
package collector
import (
"errors"
"fmt"
"os"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
)
const (
sockStatSubsystem = "sockstat"
)
// Used for calculating the total memory bytes on TCP and UDP.
var pageSize = os.Getpagesize()
type sockStatCollector struct {
logger log.Logger
}
func init() {
registerCollector(sockStatSubsystem, defaultEnabled, NewSockStatCollector)
}
// NewSockStatCollector returns a new Collector exposing socket stats.
func NewSockStatCollector(logger log.Logger) (Collector, error) {
return &sockStatCollector{logger}, nil
}
func (c *sockStatCollector) Update(ch chan<- prometheus.Metric) error {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return fmt.Errorf("failed to open procfs: %w", err)
}
// If IPv4 and/or IPv6 are disabled on this kernel, handle it gracefully.
stat4, err := fs.NetSockstat()
switch {
case err == nil:
case errors.Is(err, os.ErrNotExist):
level.Debug(c.logger).Log("msg", "IPv4 sockstat statistics not found, skipping")
default:
return fmt.Errorf("failed to get IPv4 sockstat data: %w", err)
}
stat6, err := fs.NetSockstat6()
switch {
case err == nil:
case errors.Is(err, os.ErrNotExist):
level.Debug(c.logger).Log("msg", "IPv6 sockstat statistics not found, skipping")
default:
return fmt.Errorf("failed to get IPv6 sockstat data: %w", err)
}
stats := []struct {
isIPv6 bool
stat *procfs.NetSockstat
}{
{
stat: stat4,
},
{
isIPv6: true,
stat: stat6,
},
}
for _, s := range stats {
c.update(ch, s.isIPv6, s.stat)
}
return nil
}
func (c *sockStatCollector) update(ch chan<- prometheus.Metric, isIPv6 bool, s *procfs.NetSockstat) {
if s == nil {
// IPv6 disabled or similar; nothing to do.
return
}
// If sockstat contains the number of used sockets, export it.
if !isIPv6 && s.Used != nil {
// TODO: this must be updated if sockstat6 ever exports this data.
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, sockStatSubsystem, "sockets_used"),
"Number of IPv4 sockets in use.",
nil,
nil,
),
prometheus.GaugeValue,
float64(*s.Used),
)
}
// A name and optional value for a sockstat metric.
type ssPair struct {
name string
v *int
}
// Previously these metric names were generated directly from the file output.
// In order to keep the same level of compatibility, we must map the fields
// to their correct names.
for _, p := range s.Protocols {
pairs := []ssPair{
{
name: "inuse",
v: &p.InUse,
},
{
name: "orphan",
v: p.Orphan,
},
{
name: "tw",
v: p.TW,
},
{
name: "alloc",
v: p.Alloc,
},
{
name: "mem",
v: p.Mem,
},
{
name: "memory",
v: p.Memory,
},
}
// Also export mem_bytes values for sockets which have a mem value
// stored in pages.
if p.Mem != nil {
v := *p.Mem * pageSize
pairs = append(pairs, ssPair{
name: "mem_bytes",
v: &v,
})
}
for _, pair := range pairs {
if pair.v == nil {
// This value is not set for this protocol; nothing to do.
continue
}
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(
namespace,
sockStatSubsystem,
fmt.Sprintf("%s_%s", p.Protocol, pair.name),
),
fmt.Sprintf("Number of %s sockets in state %s.", p.Protocol, pair.name),
nil,
nil,
),
prometheus.GaugeValue,
float64(*pair.v),
)
}
}
}
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