func (wr *Wrangler) exportVtnsToZkns(zconn zk.Conn, vtnsAddrPath, zknsAddrPath string) ([]string, error) { zknsPaths := make([]string, 0, 32) parts := strings.Split(vtnsAddrPath, "/") if len(parts) != 8 && len(parts) != 9 { return nil, fmt.Errorf("Invalid leaf zk path: %v", vtnsAddrPath) } cell := parts[2] keyspace := parts[5] shard := parts[6] tabletType := topo.TabletType(parts[7]) if tabletType == "action" || tabletType == "actionlog" { return nil, nil } addrs, err := wr.ts.GetEndPoints(cell, keyspace, shard, tabletType) if err != nil { return nil, err } // Write the individual endpoints and compute the SRV entries. vtoccAddrs := LegacyZknsAddrs{make([]string, 0, 8)} defaultAddrs := LegacyZknsAddrs{make([]string, 0, 8)} for i, entry := range addrs.Entries { zknsAddrPath := fmt.Sprintf("%v/%v", zknsAddrPath, i) zknsPaths = append(zknsPaths, zknsAddrPath) zknsAddr := zkns.ZknsAddr{Host: entry.Host, Port: entry.NamedPortMap["_mysql"], NamedPortMap: entry.NamedPortMap} err := WriteAddr(zconn, zknsAddrPath, &zknsAddr) if err != nil { return nil, err } defaultAddrs.Endpoints = append(defaultAddrs.Endpoints, zknsAddrPath) vtoccAddrs.Endpoints = append(vtoccAddrs.Endpoints, zknsAddrPath+":_vtocc") } // Prune any zkns entries that are no longer referenced by the // shard graph. deleteIdx := len(addrs.Entries) for { zknsStaleAddrPath := fmt.Sprintf("%v/%v", zknsAddrPath, deleteIdx) // A "delete" is a write of sorts - just communicate up that nothing // needs to be done to this node. zknsPaths = append(zknsPaths, zknsStaleAddrPath) err := zconn.Delete(zknsStaleAddrPath, -1) if zookeeper.IsError(err, zookeeper.ZNONODE) { break } if err != nil { return nil, err } deleteIdx++ } // Write the VDNS entries for both vtocc and mysql vtoccVdnsPath := fmt.Sprintf("%v/_vtocc.vdns", zknsAddrPath) zknsPaths = append(zknsPaths, vtoccVdnsPath) if err = WriteAddrs(zconn, vtoccVdnsPath, &vtoccAddrs); err != nil { return nil, err } defaultVdnsPath := fmt.Sprintf("%v.vdns", zknsAddrPath) zknsPaths = append(zknsPaths, defaultVdnsPath) if err = WriteAddrs(zconn, defaultVdnsPath, &defaultAddrs); err != nil { return nil, err } return zknsPaths, nil }