/
manager.go
178 lines (162 loc) · 4.89 KB
/
manager.go
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package targets
import (
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
"github.com/grafana/loki/pkg/promtail/api"
"github.com/grafana/loki/pkg/promtail/positions"
"github.com/grafana/loki/pkg/promtail/scrapeconfig"
"github.com/grafana/loki/pkg/promtail/targets/file"
"github.com/grafana/loki/pkg/promtail/targets/journal"
"github.com/grafana/loki/pkg/promtail/targets/lokipush"
"github.com/grafana/loki/pkg/promtail/targets/stdin"
"github.com/grafana/loki/pkg/promtail/targets/syslog"
"github.com/grafana/loki/pkg/promtail/targets/target"
)
const (
FileScrapeConfigs = "fileScrapeConfigs"
JournalScrapeConfigs = "journalScrapeConfigs"
SyslogScrapeConfigs = "syslogScrapeConfigs"
PushScrapeConfigs = "pushScrapeConfigs"
)
type targetManager interface {
Ready() bool
Stop()
ActiveTargets() map[string][]target.Target
AllTargets() map[string][]target.Target
}
// TargetManagers manages a list of target managers.
type TargetManagers struct {
targetManagers []targetManager
positions positions.Positions
}
// NewTargetManagers makes a new TargetManagers
func NewTargetManagers(
app stdin.Shutdownable,
logger log.Logger,
positionsConfig positions.Config,
client api.EntryHandler,
scrapeConfigs []scrapeconfig.Config,
targetConfig *file.Config,
) (*TargetManagers, error) {
var targetManagers []targetManager
targetScrapeConfigs := make(map[string][]scrapeconfig.Config, 4)
if targetConfig.Stdin {
level.Debug(logger).Log("msg", "configured to read from stdin")
stdin, err := stdin.NewStdinTargetManager(logger, app, client, scrapeConfigs)
if err != nil {
return nil, err
}
targetManagers = append(targetManagers, stdin)
return &TargetManagers{targetManagers: targetManagers}, nil
}
positions, err := positions.New(logger, positionsConfig)
if err != nil {
return nil, err
}
for _, cfg := range scrapeConfigs {
switch {
case cfg.HasServiceDiscoveryConfig():
targetScrapeConfigs[FileScrapeConfigs] = append(targetScrapeConfigs[FileScrapeConfigs], cfg)
case cfg.JournalConfig != nil:
targetScrapeConfigs[JournalScrapeConfigs] = append(targetScrapeConfigs[JournalScrapeConfigs], cfg)
case cfg.SyslogConfig != nil:
targetScrapeConfigs[SyslogScrapeConfigs] = append(targetScrapeConfigs[SyslogScrapeConfigs], cfg)
case cfg.PushConfig != nil:
targetScrapeConfigs[PushScrapeConfigs] = append(targetScrapeConfigs[PushScrapeConfigs], cfg)
default:
return nil, errors.New("unknown scrape config")
}
}
for target, scrapeConfigs := range targetScrapeConfigs {
switch target {
case FileScrapeConfigs:
fileTargetManager, err := file.NewFileTargetManager(
logger,
positions,
client,
scrapeConfigs,
targetConfig,
)
if err != nil {
return nil, errors.Wrap(err, "failed to make file target manager")
}
targetManagers = append(targetManagers, fileTargetManager)
case JournalScrapeConfigs:
journalTargetManager, err := journal.NewJournalTargetManager(
logger,
positions,
client,
scrapeConfigs,
)
if err != nil {
return nil, errors.Wrap(err, "failed to make journal target manager")
}
targetManagers = append(targetManagers, journalTargetManager)
case SyslogScrapeConfigs:
syslogTargetManager, err := syslog.NewSyslogTargetManager(
logger,
client,
scrapeConfigs,
)
if err != nil {
return nil, errors.Wrap(err, "failed to make syslog target manager")
}
targetManagers = append(targetManagers, syslogTargetManager)
case PushScrapeConfigs:
pushTargetManager, err := lokipush.NewPushTargetManager(
logger,
client,
scrapeConfigs,
)
if err != nil {
return nil, errors.Wrap(err, "failed to make Loki Push API target manager")
}
targetManagers = append(targetManagers, pushTargetManager)
default:
return nil, errors.New("unknown scrape config")
}
}
return &TargetManagers{
targetManagers: targetManagers,
positions: positions,
}, nil
}
// ActiveTargets returns active targets per jobs
func (tm *TargetManagers) ActiveTargets() map[string][]target.Target {
result := map[string][]target.Target{}
for _, t := range tm.targetManagers {
for job, targets := range t.ActiveTargets() {
result[job] = append(result[job], targets...)
}
}
return result
}
// AllTargets returns all targets per jobs
func (tm *TargetManagers) AllTargets() map[string][]target.Target {
result := map[string][]target.Target{}
for _, t := range tm.targetManagers {
for job, targets := range t.AllTargets() {
result[job] = append(result[job], targets...)
}
}
return result
}
// Ready if there's at least one ready target manager.
func (tm *TargetManagers) Ready() bool {
for _, t := range tm.targetManagers {
if t.Ready() {
return true
}
}
return false
}
// Stop the TargetManagers.
func (tm *TargetManagers) Stop() {
for _, t := range tm.targetManagers {
t.Stop()
}
if tm.positions != nil {
tm.positions.Stop()
}
}