vitess.io/vitess@v0.16.2/go/vt/topo/topoproto/destination.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 "encoding/hex" 21 "strings" 22 23 "vitess.io/vitess/go/vt/key" 24 "vitess.io/vitess/go/vt/vterrors" 25 26 topodatapb "vitess.io/vitess/go/vt/proto/topodata" 27 vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc" 28 ) 29 30 // ParseDestination parses the string representation of a Destination 31 // of the form keyspace:shard@tablet_type. You can use a / instead of a :. 32 func ParseDestination(targetString string, defaultTabletType topodatapb.TabletType) (string, topodatapb.TabletType, key.Destination, error) { 33 var dest key.Destination 34 var keyspace string 35 tabletType := defaultTabletType 36 37 last := strings.LastIndexAny(targetString, "@") 38 if last != -1 { 39 // No need to check the error. UNKNOWN will be returned on 40 // error and it will fail downstream. 41 tabletType, _ = ParseTabletType(targetString[last+1:]) 42 targetString = targetString[:last] 43 } 44 last = strings.LastIndexAny(targetString, "/:") 45 if last != -1 { 46 dest = key.DestinationShard(targetString[last+1:]) 47 targetString = targetString[:last] 48 } 49 // Try to parse it as a keyspace id or range 50 last = strings.LastIndexAny(targetString, "[") 51 if last != -1 { 52 rangeEnd := strings.LastIndexAny(targetString, "]") 53 if rangeEnd == -1 { 54 return keyspace, tabletType, dest, vterrors.Errorf(vtrpcpb.Code_INVALID_ARGUMENT, "invalid key range provided. Couldn't find range end ']'") 55 } 56 rangeString := targetString[last+1 : rangeEnd] 57 if strings.Contains(rangeString, "-") { 58 // Parse as range 59 keyRange, err := key.ParseShardingSpec(rangeString) 60 if err != nil { 61 return keyspace, tabletType, dest, err 62 } 63 if len(keyRange) != 1 { 64 return keyspace, tabletType, dest, vterrors.Errorf(vtrpcpb.Code_INVALID_ARGUMENT, "single keyrange expected in %s", rangeString) 65 } 66 dest = key.DestinationExactKeyRange{KeyRange: keyRange[0]} 67 } else { 68 // Parse as keyspace id 69 destBytes, err := hex.DecodeString(rangeString) 70 if err != nil { 71 return keyspace, tabletType, dest, vterrors.Errorf(vtrpcpb.Code_INVALID_ARGUMENT, "expected valid hex in keyspace id %s", rangeString) 72 } 73 dest = key.DestinationKeyspaceID(destBytes) 74 } 75 targetString = targetString[:last] 76 } 77 keyspace = targetString 78 return keyspace, tabletType, dest, nil 79 }