/
gc.go
67 lines (54 loc) · 1.87 KB
/
gc.go
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package spanner
import (
"context"
"fmt"
"time"
"cloud.google.com/go/spanner"
sq "github.com/Masterminds/squirrel"
"github.com/go-co-op/gocron"
"github.com/rs/zerolog/log"
)
// runGC runs the gc cron job, returning an error if it can't start properly.
// it cleans up and stops when ctx is Done.
func (sd spannerDatastore) runGC(ctx context.Context) error {
if sd.config.gcInterval <= 0 {
log.Info().Stringer("interval", sd.config.gcInterval).Msg("garbage collection: disabled")
return nil
}
log.Info().Stringer("interval", sd.config.gcInterval).Msg("garbage collection: starting")
s := gocron.NewScheduler(time.UTC)
var numRemoved int64
_, err := s.Every(sd.config.gcInterval).Do(func() {
ctx, span := tracer.Start(context.Background(), "CollectGarbage")
defer span.End()
ctx, cancel := context.WithTimeout(ctx, sd.config.gcInterval)
defer cancel()
spannerNow, err := sd.now(ctx)
if err != nil {
log.Error().Err(err).Msg("garbage collection: error computing datastore time")
}
oldestRevision := spannerNow.Add(-1 * sd.config.gcWindow)
stmt, args, err := sql.Delete(tableChangelog).Where(sq.Lt{colChangeTS: oldestRevision}).ToSql()
if err != nil {
log.Error().Err(err).Msg("garbage collection: error creating delete statement")
}
_, err = sd.client.ReadWriteTransaction(ctx, func(ctx context.Context, rwt *spanner.ReadWriteTransaction) error {
numRemoved, err = rwt.Update(ctx, statementFromSQL(stmt, args))
return err
})
if err != nil {
log.Error().Err(err).Msg("garbage collection: error deleting entries")
}
log.Info().Int64("removed", numRemoved).Stringer("before", oldestRevision).
Msg("garbage collection: removed changelog entries")
})
if err != nil {
return fmt.Errorf("unable to start garbage collection: %w", err)
}
go func() {
<-ctx.Done()
log.Info().Msg("garbage collection: stopping")
s.Stop()
}()
return nil
}