github.com/dolthub/go-mysql-server@v0.18.0/sql/plan/kill.go (about)

     1  // Copyright 2021 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package plan
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/dolthub/go-mysql-server/sql"
    21  	"github.com/dolthub/go-mysql-server/sql/types"
    22  )
    23  
    24  type KillType int
    25  
    26  const (
    27  	KillType_Query      KillType = 0
    28  	KillType_Connection KillType = 1
    29  )
    30  
    31  func (kt KillType) String() string {
    32  	if kt == KillType_Query {
    33  		return "QUERY"
    34  	} else if kt == KillType_Connection {
    35  		return "CONNECTION"
    36  	}
    37  	panic(fmt.Sprintf("Invalid KillType value %d", kt))
    38  }
    39  
    40  type Kill struct {
    41  	Kt     KillType
    42  	ConnID uint32
    43  }
    44  
    45  var _ sql.Node = (*Kill)(nil)
    46  var _ sql.CollationCoercible = (*Kill)(nil)
    47  
    48  func NewKill(kt KillType, connID uint32) *Kill {
    49  	return &Kill{kt, connID}
    50  }
    51  
    52  func (k *Kill) Resolved() bool {
    53  	return true
    54  }
    55  
    56  func (k *Kill) Children() []sql.Node {
    57  	return nil
    58  }
    59  
    60  func (k *Kill) IsReadOnly() bool {
    61  	return true
    62  }
    63  
    64  func (k *Kill) WithChildren(children ...sql.Node) (sql.Node, error) {
    65  	if len(children) != 0 {
    66  		return nil, sql.ErrInvalidChildrenNumber.New(k, len(children), 0)
    67  	}
    68  	return k, nil
    69  }
    70  
    71  // CheckPrivileges implements the interface sql.Node.
    72  func (k *Kill) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
    73  	//TODO: If the user doesn't have the SUPER privilege, they should still be able to kill their own threads
    74  	return opChecker.UserHasPrivileges(ctx,
    75  		sql.NewPrivilegedOperation(sql.PrivilegeCheckSubject{}, sql.PrivilegeType_Super))
    76  }
    77  
    78  // CollationCoercibility implements the interface sql.CollationCoercible.
    79  func (*Kill) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
    80  	return sql.Collation_binary, 7
    81  }
    82  
    83  func (k *Kill) Schema() sql.Schema {
    84  	return types.OkResultSchema
    85  }
    86  
    87  func (k *Kill) String() string {
    88  	return fmt.Sprintf("KILL %s %d", k.Kt.String(), k.ConnID)
    89  }