func (zkts *Server) updateTabletEndpoint(oldValue string, oldStat zk.Stat, addr *topo.VtnsAddr) (newValue string, err error) {
if oldStat == nil {
// The incoming object doesn't exist - we haven't been placed in the serving
// graph yet, so don't update. Assume the next process that rebuilds the graph
// will get the updated tablet location.
return "", skipUpdateErr
}
var addrs *topo.VtnsAddrs
if oldValue != "" {
addrs, err = topo.NewVtnsAddrs(oldValue, oldStat.Version())
if err != nil {
return
}
foundTablet := false
for i, entry := range addrs.Entries {
if entry.Uid == addr.Uid {
foundTablet = true
if !topo.VtnsAddrEquality(&entry, addr) {
addrs.Entries[i] = *addr
}
break
}
}
if !foundTablet {
addrs.Entries = append(addrs.Entries, *addr)
}
} else {
addrs = topo.NewAddrs()
addrs.Entries = append(addrs.Entries, *addr)
}
return jscfg.ToJson(addrs), nil
}
func (zkts *Server) GetSrvTabletType(cell, keyspace, shard string, tabletType topo.TabletType) (*topo.VtnsAddrs, error) {
path := zkPathForVtName(cell, keyspace, shard, tabletType)
data, stat, err := zkts.zconn.Get(path)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return nil, err
}
return topo.NewVtnsAddrs(data, stat.Version())
}