vitess.io/vitess@v0.16.2/go/vt/topo/topoproto/srvkeyspace.go (about) 1 /* 2 Copyright 2019 The Vitess Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package topoproto 18 19 import ( 20 "bytes" 21 "sort" 22 23 topodatapb "vitess.io/vitess/go/vt/proto/topodata" 24 ) 25 26 // ShardReferenceArray is used for sorting ShardReference arrays 27 type ShardReferenceArray []*topodatapb.ShardReference 28 29 // Len implements sort.Interface 30 func (sra ShardReferenceArray) Len() int { return len(sra) } 31 32 // Len implements sort.Interface 33 func (sra ShardReferenceArray) Less(i, j int) bool { 34 if sra[i].KeyRange == nil || len(sra[i].KeyRange.Start) == 0 { 35 return true 36 } 37 if sra[j].KeyRange == nil || len(sra[j].KeyRange.Start) == 0 { 38 return false 39 } 40 return bytes.Compare(sra[i].KeyRange.Start, sra[j].KeyRange.Start) < 0 41 } 42 43 // Len implements sort.Interface 44 func (sra ShardReferenceArray) Swap(i, j int) { 45 sra[i], sra[j] = sra[j], sra[i] 46 } 47 48 // Sort will sort the list according to KeyRange.Start 49 func (sra ShardReferenceArray) Sort() { sort.Sort(sra) } 50 51 // SrvKeyspaceGetPartition returns a Partition for the given tablet type, 52 // or nil if it's not there. 53 func SrvKeyspaceGetPartition(sk *topodatapb.SrvKeyspace, tabletType topodatapb.TabletType) *topodatapb.SrvKeyspace_KeyspacePartition { 54 for _, p := range sk.Partitions { 55 if p.ServedType == tabletType { 56 return p 57 } 58 } 59 return nil 60 }