github.com/dolthub/dolt/go@v0.40.5-0.20240520175717-68db7794bea6/libraries/doltcore/sqle/binlogreplication/binlog_metadata_persistence.go (about)

     1  // Copyright 2023 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 binlogreplication
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/dolthub/go-mysql-server/sql"
    21  	"github.com/dolthub/go-mysql-server/sql/mysql_db"
    22  
    23  	"github.com/dolthub/dolt/go/libraries/doltcore/sqlserver"
    24  )
    25  
    26  // persistReplicationConfiguration saves the specified |replicaSourceInfo| to disk; if any problems are encountered
    27  // while saving to disk, an error is returned.
    28  func persistReplicationConfiguration(ctx *sql.Context, replicaSourceInfo *mysql_db.ReplicaSourceInfo) error {
    29  	server := sqlserver.GetRunningServer()
    30  	if server == nil {
    31  		return fmt.Errorf("no SQL server running; " +
    32  			"replication commands may only be used when running from dolt sql-server, and not from dolt sql")
    33  	}
    34  	engine := server.Engine
    35  
    36  	mysqlDb := engine.Analyzer.Catalog.MySQLDb
    37  	ed := mysqlDb.Editor()
    38  	defer ed.Close()
    39  	ed.PutReplicaSourceInfo(replicaSourceInfo)
    40  	return mysqlDb.Persist(ctx, ed)
    41  }
    42  
    43  // loadReplicationConfiguration loads the replication configuration for default channel ("").
    44  func loadReplicationConfiguration(_ *sql.Context) (*mysql_db.ReplicaSourceInfo, error) {
    45  	server := sqlserver.GetRunningServer()
    46  	if server == nil {
    47  		return nil, fmt.Errorf("no SQL server running; " +
    48  			"replication commands may only be used when running from dolt sql-server, and not from dolt sql")
    49  	}
    50  	engine := server.Engine
    51  	mysqlDb := engine.Analyzer.Catalog.MySQLDb
    52  	rd := mysqlDb.Reader()
    53  	defer rd.Close()
    54  
    55  	rsi, ok := rd.GetReplicaSourceInfo(mysql_db.ReplicaSourceInfoPrimaryKey{
    56  		Channel: "",
    57  	})
    58  	if ok {
    59  		return rsi, nil
    60  	}
    61  
    62  	return nil, nil
    63  }
    64  
    65  // deleteReplicationConfiguration deletes all replication configuration for the default channel ("").
    66  func deleteReplicationConfiguration(ctx *sql.Context) error {
    67  	server := sqlserver.GetRunningServer()
    68  	if server == nil {
    69  		return fmt.Errorf("no SQL server running; " +
    70  			"replication commands may only be used when running from dolt sql-server, and not from dolt sql")
    71  	}
    72  	engine := server.Engine
    73  	mysqlDb := engine.Analyzer.Catalog.MySQLDb
    74  	ed := mysqlDb.Editor()
    75  	defer ed.Close()
    76  
    77  	ed.RemoveReplicaSourceInfo(mysql_db.ReplicaSourceInfoPrimaryKey{})
    78  
    79  	return engine.Analyzer.Catalog.MySQLDb.Persist(ctx, ed)
    80  }
    81  
    82  // persistSourceUuid saves the specified |sourceUuid| to a persistent storage location.
    83  func persistSourceUuid(ctx *sql.Context, sourceUuid string) error {
    84  	replicaSourceInfo, err := loadReplicationConfiguration(ctx)
    85  	if err != nil {
    86  		return err
    87  	}
    88  
    89  	replicaSourceInfo.Uuid = sourceUuid
    90  	return persistReplicationConfiguration(ctx, replicaSourceInfo)
    91  }