// InitTablet creates or updates a tablet. If no parent is specified
// in the tablet, and the tablet has a slave type, we will find the
// appropriate parent. If createShardAndKeyspace is true and the
// parent keyspace or shard don't exist, they will be created. If
// update is true, and a tablet with the same ID exists, update it.
// If Force is true, and a tablet with the same ID already exists, it
// will be scrapped and deleted, and then recreated.
func (wr *Wrangler) InitTablet(tablet *topo.Tablet, force, createShardAndKeyspace, update bool) error {
if err := tablet.Complete(); err != nil {
return err
}
if tablet.IsInReplicationGraph() {
// create the parent keyspace and shard if needed
if createShardAndKeyspace {
if err := wr.ts.CreateKeyspace(tablet.Keyspace, &topo.Keyspace{}); err != nil && err != topo.ErrNodeExists {
return err
}
if err := topo.CreateShard(wr.ts, tablet.Keyspace, tablet.Shard); err != nil && err != topo.ErrNodeExists {
return err
}
}
// get the shard, checks a couple things
si, err := wr.ts.GetShard(tablet.Keyspace, tablet.Shard)
if err != nil {
return fmt.Errorf("missing parent shard, use -parent option to create it, or CreateKeyspace / CreateShard")
}
if si.KeyRange != tablet.KeyRange {
return fmt.Errorf("shard %v/%v has a different KeyRange: %v != %v", tablet.Keyspace, tablet.Shard, si.KeyRange, tablet.KeyRange)
}
if tablet.Type == topo.TYPE_MASTER && !si.MasterAlias.IsZero() && si.MasterAlias != tablet.Alias && !force {
return fmt.Errorf("creating this tablet would override old master %v in shard %v/%v", si.MasterAlias, tablet.Keyspace, tablet.Shard)
}
// see if we specified a parent, otherwise get it from the shard
if tablet.Parent.IsZero() && tablet.Type.IsSlaveType() {
if si.MasterAlias.IsZero() {
return fmt.Errorf("trying to create tablet %v in shard %v/%v without a master", tablet.Alias, tablet.Keyspace, tablet.Shard)
}
tablet.Parent = si.MasterAlias
}
// update the shard record if needed
if err := wr.updateShardCellsAndMaster(si, tablet.Alias, tablet.Type, force); err != nil {
return err
}
}
err := topo.CreateTablet(wr.ts, tablet)
if err != nil && err == topo.ErrNodeExists {
// Try to update nicely, but if it fails fall back to force behavior.
if update || force {
oldTablet, err := wr.ts.GetTablet(tablet.Alias)
if err != nil {
wr.Logger().Warningf("failed reading tablet %v: %v", tablet.Alias, err)
} else {
if oldTablet.Keyspace == tablet.Keyspace && oldTablet.Shard == tablet.Shard {
*(oldTablet.Tablet) = *tablet
if err := topo.UpdateTablet(context.TODO(), wr.ts, oldTablet); err != nil {
wr.Logger().Warningf("failed updating tablet %v: %v", tablet.Alias, err)
// now fall through the Scrap case
} else {
if !tablet.IsInReplicationGraph() {
return nil
}
if err := topo.UpdateTabletReplicationData(context.TODO(), wr.ts, tablet); err != nil {
wr.Logger().Warningf("failed updating tablet replication data for %v: %v", tablet.Alias, err)
// now fall through the Scrap case
} else {
return nil
}
}
}
}
}
if force {
if err = wr.Scrap(tablet.Alias, force, false); err != nil {
wr.Logger().Errorf("failed scrapping tablet %v: %v", tablet.Alias, err)
return err
}
if err := wr.ts.DeleteTablet(tablet.Alias); err != nil {
// we ignore this
wr.Logger().Errorf("failed deleting tablet %v: %v", tablet.Alias, err)
}
return topo.CreateTablet(wr.ts, tablet)
}
}
return err
}
