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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
// SPDX-License-Identifier: GPL-3.0-or-later
package pipeline
import (
"context"
"errors"
"fmt"
"log/slog"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/confgroup"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/discoverer/kubernetes"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/discoverer/netlisteners"
"github.com/netdata/netdata/go/go.d.plugin/agent/discovery/sd/model"
"github.com/netdata/netdata/go/go.d.plugin/logger"
)
func New(cfg Config) (*Pipeline, error) {
if err := validateConfig(cfg); err != nil {
return nil, err
}
clr, err := newTargetClassificator(cfg.Classify)
if err != nil {
return nil, fmt.Errorf("classify rules: %v", err)
}
cmr, err := newConfigComposer(cfg.Compose)
if err != nil {
return nil, fmt.Errorf("compose rules: %v", err)
}
p := &Pipeline{
Logger: logger.New().With(
slog.String("component", "service discovery"),
slog.String("pipeline", cfg.Name),
),
configDefaults: cfg.ConfigDefaults,
clr: clr,
cmr: cmr,
accum: newAccumulator(),
discoverers: make([]model.Discoverer, 0),
configs: make(map[string]map[uint64][]confgroup.Config),
}
p.accum.Logger = p.Logger
if err := p.registerDiscoverers(cfg); err != nil {
return nil, err
}
return p, nil
}
type (
Pipeline struct {
*logger.Logger
configDefaults confgroup.Registry
discoverers []model.Discoverer
accum *accumulator
clr classificator
cmr composer
configs map[string]map[uint64][]confgroup.Config // [targetSource][targetHash]
}
classificator interface {
classify(model.Target) model.Tags
}
composer interface {
compose(model.Target) []confgroup.Config
}
)
func (p *Pipeline) registerDiscoverers(conf Config) error {
for _, cfg := range conf.Discover {
switch cfg.Discoverer {
case "net_listeners":
cfg.NetListeners.Source = conf.Source
td, err := netlisteners.NewDiscoverer(cfg.NetListeners)
if err != nil {
return fmt.Errorf("failed to create 'net_listeners' discoverer: %v", err)
}
p.discoverers = append(p.discoverers, td)
case "k8s":
for _, k8sCfg := range cfg.K8s {
td, err := kubernetes.NewKubeDiscoverer(k8sCfg)
if err != nil {
return fmt.Errorf("failed to create 'k8s' discoverer: %v", err)
}
p.discoverers = append(p.discoverers, td)
}
default:
return fmt.Errorf("unknown discoverer: '%s'", cfg.Discoverer)
}
}
if len(p.discoverers) == 0 {
return errors.New("no discoverers registered")
}
return nil
}
func (p *Pipeline) Run(ctx context.Context, in chan<- []*confgroup.Group) {
p.Info("instance is started")
defer p.Info("instance is stopped")
p.accum.discoverers = p.discoverers
updates := make(chan []model.TargetGroup)
done := make(chan struct{})
go func() { defer close(done); p.accum.run(ctx, updates) }()
for {
select {
case <-ctx.Done():
select {
case <-done:
case <-time.After(time.Second * 4):
}
return
case <-done:
return
case tggs := <-updates:
p.Debugf("received %d target groups", len(tggs))
if cfggs := p.processGroups(tggs); len(cfggs) > 0 {
select {
case <-ctx.Done():
case in <- cfggs: // FIXME: potentially stale configs if upstream cannot receive (blocking)
}
}
}
}
}
func (p *Pipeline) processGroups(tggs []model.TargetGroup) []*confgroup.Group {
var groups []*confgroup.Group
// updates come from the accumulator, this ensures that all groups have different sources
for _, tgg := range tggs {
p.Debugf("processing group '%s' with %d target(s)", tgg.Source(), len(tgg.Targets()))
if v := p.processGroup(tgg); v != nil {
groups = append(groups, v)
}
}
return groups
}
func (p *Pipeline) processGroup(tgg model.TargetGroup) *confgroup.Group {
if len(tgg.Targets()) == 0 {
if _, ok := p.configs[tgg.Source()]; !ok {
return nil
}
delete(p.configs, tgg.Source())
return &confgroup.Group{Source: tgg.Source()}
}
targetsCache, ok := p.configs[tgg.Source()]
if !ok {
targetsCache = make(map[uint64][]confgroup.Config)
p.configs[tgg.Source()] = targetsCache
}
var changed bool
seen := make(map[uint64]bool)
for _, tgt := range tgg.Targets() {
if tgt == nil {
continue
}
hash := tgt.Hash()
seen[hash] = true
if _, ok := targetsCache[hash]; ok {
continue
}
targetsCache[hash] = nil
if tags := p.clr.classify(tgt); len(tags) > 0 {
tgt.Tags().Merge(tags)
if cfgs := p.cmr.compose(tgt); len(cfgs) > 0 {
targetsCache[hash] = cfgs
changed = true
for _, cfg := range cfgs {
cfg.SetProvider(tgg.Provider())
cfg.SetSource(tgg.Source())
cfg.SetSourceType(confgroup.TypeDiscovered)
if def, ok := p.configDefaults.Lookup(cfg.Module()); ok {
cfg.ApplyDefaults(def)
}
}
}
}
}
for hash := range targetsCache {
if seen[hash] {
continue
}
if cfgs := targetsCache[hash]; len(cfgs) > 0 {
changed = true
}
delete(targetsCache, hash)
}
if !changed {
return nil
}
// TODO: deepcopy?
cfgGroup := &confgroup.Group{Source: tgg.Source()}
for _, cfgs := range targetsCache {
cfgGroup.Configs = append(cfgGroup.Configs, cfgs...)
}
return cfgGroup
}
|
