vitess.io/vitess@v0.16.2/go/vt/vtgate/planbuilder/migration.go (about)

     1  /*
     2  Copyright 2021 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 planbuilder
    18  
    19  import (
    20  	"vitess.io/vitess/go/vt/key"
    21  	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
    22  	"vitess.io/vitess/go/vt/schema"
    23  	"vitess.io/vitess/go/vt/sqlparser"
    24  	"vitess.io/vitess/go/vt/vterrors"
    25  	"vitess.io/vitess/go/vt/vtgate/engine"
    26  	"vitess.io/vitess/go/vt/vtgate/planbuilder/plancontext"
    27  )
    28  
    29  func buildAlterMigrationPlan(query string, vschema plancontext.VSchema, enableOnlineDDL bool) (*planResult, error) {
    30  	if !enableOnlineDDL {
    31  		return nil, schema.ErrOnlineDDLDisabled
    32  	}
    33  	dest, ks, tabletType, err := vschema.TargetDestination("")
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  	if ks == nil {
    38  		return nil, vterrors.VT09005()
    39  	}
    40  
    41  	if tabletType != topodatapb.TabletType_PRIMARY {
    42  		return nil, vterrors.VT09006("ALTER")
    43  	}
    44  
    45  	if dest == nil {
    46  		dest = key.DestinationAllShards{}
    47  	}
    48  
    49  	send := &engine.Send{
    50  		Keyspace:          ks,
    51  		TargetDestination: dest,
    52  		Query:             query,
    53  	}
    54  	return newPlanResult(send), nil
    55  }
    56  
    57  func buildRevertMigrationPlan(query string, stmt *sqlparser.RevertMigration, vschema plancontext.VSchema, enableOnlineDDL bool) (*planResult, error) {
    58  	if !enableOnlineDDL {
    59  		return nil, schema.ErrOnlineDDLDisabled
    60  	}
    61  	dest, ks, tabletType, err := vschema.TargetDestination("")
    62  	if err != nil {
    63  		return nil, err
    64  	}
    65  	if ks == nil {
    66  		return nil, vterrors.VT09005()
    67  	}
    68  
    69  	if tabletType != topodatapb.TabletType_PRIMARY {
    70  		return nil, vterrors.VT09006("REVERT")
    71  	}
    72  
    73  	if dest == nil {
    74  		dest = key.DestinationAllShards{}
    75  	}
    76  
    77  	emig := &engine.RevertMigration{
    78  		Keyspace:          ks,
    79  		TargetDestination: dest,
    80  		Stmt:              stmt,
    81  		Query:             query,
    82  	}
    83  	return newPlanResult(emig), nil
    84  }
    85  
    86  func buildShowMigrationLogsPlan(query string, vschema plancontext.VSchema, enableOnlineDDL bool) (*planResult, error) {
    87  	if !enableOnlineDDL {
    88  		return nil, schema.ErrOnlineDDLDisabled
    89  	}
    90  	dest, ks, tabletType, err := vschema.TargetDestination("")
    91  	if err != nil {
    92  		return nil, err
    93  	}
    94  	if ks == nil {
    95  		return nil, vterrors.VT09005()
    96  	}
    97  
    98  	if tabletType != topodatapb.TabletType_PRIMARY {
    99  		return nil, vterrors.VT09006("SHOW")
   100  	}
   101  
   102  	if dest == nil {
   103  		dest = key.DestinationAllShards{}
   104  	}
   105  
   106  	send := &engine.Send{
   107  		Keyspace:          ks,
   108  		TargetDestination: dest,
   109  		Query:             query,
   110  	}
   111  	return newPlanResult(send), nil
   112  }