forked from grafana/loki
/
targetmanager.go
151 lines (136 loc) · 3.91 KB
/
targetmanager.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
package docker
import (
"context"
"fmt"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/discovery"
"github.com/pao214/loki/v3/clients/pkg/logentry/stages"
"github.com/pao214/loki/v3/clients/pkg/promtail/api"
"github.com/pao214/loki/v3/clients/pkg/promtail/positions"
"github.com/pao214/loki/v3/clients/pkg/promtail/scrapeconfig"
"github.com/pao214/loki/v3/clients/pkg/promtail/targets/target"
"github.com/pao214/loki/v3/pkg/util"
)
const (
// See github.com/prometheus/prometheus/discovery/moby
dockerLabel = model.MetaLabelPrefix + "docker_"
dockerLabelContainerPrefix = dockerLabel + "container_"
dockerLabelContainerID = dockerLabelContainerPrefix + "id"
dockerLabelLogStream = dockerLabelContainerPrefix + "_log_stream"
)
type TargetManager struct {
metrics *Metrics
logger log.Logger
positions positions.Positions
cancel context.CancelFunc
done chan struct{}
manager *discovery.Manager
pushClient api.EntryHandler
groups map[string]*targetGroup
}
func NewTargetManager(
metrics *Metrics,
logger log.Logger,
positions positions.Positions,
pushClient api.EntryHandler,
scrapeConfigs []scrapeconfig.Config,
) (*TargetManager, error) {
ctx, cancel := context.WithCancel(context.Background())
tm := &TargetManager{
metrics: metrics,
logger: logger,
cancel: cancel,
done: make(chan struct{}),
positions: positions,
manager: discovery.NewManager(ctx, log.With(logger, "component", "docker_discovery")),
pushClient: pushClient,
groups: make(map[string]*targetGroup),
}
configs := map[string]discovery.Configs{}
for _, cfg := range scrapeConfigs {
if cfg.DockerSDConfigs != nil {
pipeline, err := stages.NewPipeline(
log.With(logger, "component", "docker_pipeline"),
cfg.PipelineStages,
&cfg.JobName,
metrics.reg,
)
if err != nil {
return nil, err
}
for _, sdConfig := range cfg.DockerSDConfigs {
syncerKey := fmt.Sprintf("%s/%s:%d", cfg.JobName, sdConfig.Host, sdConfig.Port)
_, ok := tm.groups[syncerKey]
if !ok {
tm.groups[syncerKey] = &targetGroup{
metrics: metrics,
logger: logger,
positions: positions,
targets: make(map[string]*Target),
entryHandler: pipeline.Wrap(pushClient),
defaultLabels: model.LabelSet{},
relabelConfig: cfg.RelabelConfigs,
host: sdConfig.Host,
}
}
configs[syncerKey] = append(configs[syncerKey], sdConfig)
}
} else {
level.Debug(tm.logger).Log("msg", "Docker service discovery configs are empty")
}
}
go tm.run(ctx)
go util.LogError("running target manager", tm.manager.Run)
return tm, tm.manager.ApplyConfig(configs)
}
// run listens on the service discovery and adds new targets.
func (tm *TargetManager) run(ctx context.Context) {
defer close(tm.done)
for {
select {
case targetGroups := <-tm.manager.SyncCh():
for jobName, groups := range targetGroups {
tg, ok := tm.groups[jobName]
if !ok {
level.Debug(tm.logger).Log("msg", "unknown target for job", "job", jobName)
continue
}
tg.sync(groups)
}
case <-ctx.Done():
return
}
}
}
// Ready returns true if at least one Docker target is active.
func (tm *TargetManager) Ready() bool {
for _, s := range tm.groups {
if s.Ready() {
return true
}
}
return false
}
func (tm *TargetManager) Stop() {
tm.cancel()
<-tm.done
for _, s := range tm.groups {
s.Stop()
}
}
func (tm *TargetManager) ActiveTargets() map[string][]target.Target {
result := make(map[string][]target.Target, len(tm.groups))
for k, s := range tm.groups {
result[k] = s.ActiveTargets()
}
return result
}
func (tm *TargetManager) AllTargets() map[string][]target.Target {
result := make(map[string][]target.Target, len(tm.groups))
for k, s := range tm.groups {
result[k] = s.AllTargets()
}
return result
}