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
|
// SPDX-License-Identifier: GPL-3.0-or-later
package file
import (
"context"
"errors"
"fmt"
"log/slog"
"sync"
"github.com/netdata/netdata/go/go.d.plugin/agent/confgroup"
"github.com/netdata/netdata/go/go.d.plugin/logger"
)
var log = logger.New().With(
slog.String("component", "discovery"),
slog.String("discoverer", "file"),
)
func NewDiscovery(cfg Config) (*Discovery, error) {
if err := validateConfig(cfg); err != nil {
return nil, fmt.Errorf("file discovery config validation: %v", err)
}
d := Discovery{
Logger: log,
}
if err := d.registerDiscoverers(cfg); err != nil {
return nil, fmt.Errorf("file discovery initialization: %v", err)
}
return &d, nil
}
type (
Discovery struct {
*logger.Logger
discoverers []discoverer
}
discoverer interface {
Run(ctx context.Context, in chan<- []*confgroup.Group)
}
)
func (d *Discovery) String() string {
return d.Name()
}
func (d *Discovery) Name() string {
return fmt.Sprintf("file discovery: %v", d.discoverers)
}
func (d *Discovery) registerDiscoverers(cfg Config) error {
if len(cfg.Read) != 0 {
d.discoverers = append(d.discoverers, NewReader(cfg.Registry, cfg.Read))
}
if len(cfg.Watch) != 0 {
d.discoverers = append(d.discoverers, NewWatcher(cfg.Registry, cfg.Watch))
}
if len(d.discoverers) == 0 {
return errors.New("zero registered discoverers")
}
return nil
}
func (d *Discovery) Run(ctx context.Context, in chan<- []*confgroup.Group) {
d.Info("instance is started")
defer func() { d.Info("instance is stopped") }()
var wg sync.WaitGroup
for _, dd := range d.discoverers {
wg.Add(1)
go func(dd discoverer) {
defer wg.Done()
d.runDiscoverer(ctx, dd, in)
}(dd)
}
wg.Wait()
<-ctx.Done()
}
func (d *Discovery) runDiscoverer(ctx context.Context, dd discoverer, in chan<- []*confgroup.Group) {
updates := make(chan []*confgroup.Group)
go dd.Run(ctx, updates)
for {
select {
case <-ctx.Done():
return
case groups, ok := <-updates:
if !ok {
return
}
select {
case <-ctx.Done():
return
case in <- groups:
}
}
}
}
|
