1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
// 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.
//go:build !nosockstat
// +build !nosockstat
package collector
import (
"errors"
"fmt"
"log/slog"
"os"
"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 *slog.Logger
}
func init() {
registerCollector(sockStatSubsystem, defaultEnabled, NewSockStatCollector)
}
// NewSockStatCollector returns a new Collector exposing socket stats.
func NewSockStatCollector(logger *slog.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):
c.logger.Debug("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):
c.logger.Debug("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),
)
}
}
}
|
