-
Notifications
You must be signed in to change notification settings - Fork 13
/
bcache.go
151 lines (131 loc) · 3.37 KB
/
bcache.go
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
//go:build !windows
// +build !windows
package bcache
// bcache doesn't aim for Windows
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/circonus-labs/circonus-unified-agent/cua"
"github.com/circonus-labs/circonus-unified-agent/plugins/inputs"
)
type Bcache struct {
BcachePath string
BcacheDevs []string
}
var sampleConfig = `
## Bcache sets path
## If not specified, then default is:
bcachePath = "/sys/fs/bcache"
## By default, the agent gathers stats for all bcache devices
## Setting devices will restrict the stats to the specified
## bcache devices.
bcacheDevs = ["bcache0"]
`
func (b *Bcache) SampleConfig() string {
return sampleConfig
}
func (b *Bcache) Description() string {
return "Read metrics of bcache from stats_total and dirty_data"
}
func getTags(bdev string) map[string]string {
backingDevFile, _ := os.Readlink(bdev)
backingDevPath := strings.Split(backingDevFile, "/")
backingDev := backingDevPath[len(backingDevPath)-2]
bcacheDevFile, _ := os.Readlink(bdev + "/dev")
bcacheDevPath := strings.Split(bcacheDevFile, "/")
bcacheDev := bcacheDevPath[len(bcacheDevPath)-1]
return map[string]string{"backing_dev": backingDev, "bcache_dev": bcacheDev}
}
func prettyToBytes(v string) uint64 {
var factors = map[string]uint64{
"k": 1 << 10,
"M": 1 << 20,
"G": 1 << 30,
"T": 1 << 40,
"P": 1 << 50,
"E": 1 << 60,
}
var factor uint64
factor = 1
prefix := v[len(v)-1:]
if factors[prefix] != 0 {
v = v[:len(v)-1]
factor = factors[prefix]
}
result, _ := strconv.ParseFloat(v, 32)
result *= float64(factor)
return uint64(result)
}
func (b *Bcache) gatherBcache(bdev string, acc cua.Accumulator) error {
tags := getTags(bdev)
metrics, err := filepath.Glob(bdev + "/stats_total/*")
if err != nil {
return fmt.Errorf("glob: %w", err)
}
if len(metrics) == 0 {
return errors.New("can't read any stats file")
}
file, err := os.ReadFile(bdev + "/dirty_data")
if err != nil {
return fmt.Errorf("readfile (%s): %w", bdev+"/dirty_data", err)
}
rawValue := strings.TrimSpace(string(file))
value := prettyToBytes(rawValue)
fields := make(map[string]interface{})
fields["dirty_data"] = value
for _, path := range metrics {
key := filepath.Base(path)
file, err := os.ReadFile(path)
if err != nil {
return fmt.Errorf("readfile (%s): %w", path, err)
}
rawValue := strings.TrimSpace(string(file))
if key == "bypassed" {
value := prettyToBytes(rawValue)
fields[key] = value
} else {
value, _ := strconv.ParseUint(rawValue, 10, 64)
fields[key] = value
}
}
acc.AddFields("bcache", fields, tags)
return nil
}
func (b *Bcache) Gather(ctx context.Context, acc cua.Accumulator) error {
bcacheDevsChecked := make(map[string]bool)
var restrictDevs bool
if len(b.BcacheDevs) != 0 {
restrictDevs = true
for _, bcacheDev := range b.BcacheDevs {
bcacheDevsChecked[bcacheDev] = true
}
}
bcachePath := b.BcachePath
if len(bcachePath) == 0 {
bcachePath = "/sys/fs/bcache"
}
bdevs, _ := filepath.Glob(bcachePath + "/*/bdev*")
if len(bdevs) < 1 {
return errors.New("Can't find any bcache device")
}
for _, bdev := range bdevs {
if restrictDevs {
bcacheDev := getTags(bdev)["bcache_dev"]
if !bcacheDevsChecked[bcacheDev] {
continue
}
}
_ = b.gatherBcache(bdev, acc)
}
return nil
}
func init() {
inputs.Add("bcache", func() cua.Input {
return &Bcache{}
})
}