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service.go
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service.go
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// Package precreator provides the shard precreation service.
package precreator // import "github.com/influxdata/influxdb/services/precreator"
import (
"fmt"
"sync"
"time"
"github.com/uber-go/zap"
)
// Service manages the shard precreation service.
type Service struct {
checkInterval time.Duration
advancePeriod time.Duration
Logger zap.Logger
done chan struct{}
wg sync.WaitGroup
MetaClient interface {
PrecreateShardGroups(now, cutoff time.Time) error
}
}
// NewService returns an instance of the precreation service.
func NewService(c Config) (*Service, error) {
s := Service{
checkInterval: time.Duration(c.CheckInterval),
advancePeriod: time.Duration(c.AdvancePeriod),
Logger: zap.New(zap.NullEncoder()),
}
return &s, nil
}
// WithLogger sets the logger for the service.
func (s *Service) WithLogger(log zap.Logger) {
s.Logger = log.With(zap.String("service", "shard-precreation"))
}
// Open starts the precreation service.
func (s *Service) Open() error {
if s.done != nil {
return nil
}
s.Logger.Info(fmt.Sprintf("Starting precreation service with check interval of %s, advance period of %s",
s.checkInterval, s.advancePeriod))
s.done = make(chan struct{})
s.wg.Add(1)
go s.runPrecreation()
return nil
}
// Close stops the precreation service.
func (s *Service) Close() error {
if s.done == nil {
return nil
}
close(s.done)
s.wg.Wait()
s.done = nil
return nil
}
// runPrecreation continually checks if resources need precreation.
func (s *Service) runPrecreation() {
defer s.wg.Done()
for {
select {
case <-time.After(s.checkInterval):
if err := s.precreate(time.Now().UTC()); err != nil {
s.Logger.Info(fmt.Sprintf("failed to precreate shards: %s", err.Error()))
}
case <-s.done:
s.Logger.Info("Precreation service terminating")
return
}
}
}
// precreate performs actual resource precreation.
func (s *Service) precreate(now time.Time) error {
cutoff := now.Add(s.advancePeriod).UTC()
if err := s.MetaClient.PrecreateShardGroups(now, cutoff); err != nil {
return err
}
return nil
}