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targetmanager.go
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targetmanager.go
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package heroku
import (
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/grafana/loki/v3/clients/pkg/logentry/stages"
"github.com/grafana/loki/v3/clients/pkg/promtail/api"
"github.com/grafana/loki/v3/clients/pkg/promtail/scrapeconfig"
"github.com/grafana/loki/v3/clients/pkg/promtail/targets/target"
)
type TargetManager struct {
logger log.Logger
targets map[string]*Target
}
func NewHerokuDrainTargetManager(
metrics *Metrics,
reg prometheus.Registerer,
logger log.Logger,
client api.EntryHandler,
scrapeConfigs []scrapeconfig.Config) (*TargetManager, error) {
tm := &TargetManager{
logger: logger,
targets: make(map[string]*Target),
}
for _, cfg := range scrapeConfigs {
pipeline, err := stages.NewPipeline(log.With(logger, "component", "heroku_drain_pipeline_"+cfg.JobName), cfg.PipelineStages, &cfg.JobName, reg)
if err != nil {
return nil, err
}
t, err := NewTarget(metrics, logger, pipeline.Wrap(client), cfg.JobName, cfg.HerokuDrainConfig, cfg.RelabelConfigs)
if err != nil {
return nil, err
}
tm.targets[cfg.JobName] = t
}
return tm, nil
}
func (hm *TargetManager) Ready() bool {
for _, t := range hm.targets {
if t.Ready() {
return true
}
}
return false
}
func (hm *TargetManager) Stop() {
for name, t := range hm.targets {
if err := t.Stop(); err != nil {
level.Error(t.logger).Log("event", "failed to stop heroku drain target", "name", name, "cause", err)
}
}
}
func (hm *TargetManager) ActiveTargets() map[string][]target.Target {
return hm.AllTargets()
}
func (hm *TargetManager) AllTargets() map[string][]target.Target {
res := make(map[string][]target.Target, len(hm.targets))
for k, v := range hm.targets {
res[k] = []target.Target{v}
}
return res
}