vitess.io/vitess@v0.16.2/go/vt/binlog/keyrange_filter.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 binlog
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"vitess.io/vitess/go/vt/key"
    23  	"vitess.io/vitess/go/vt/log"
    24  
    25  	binlogdatapb "vitess.io/vitess/go/vt/proto/binlogdata"
    26  	querypb "vitess.io/vitess/go/vt/proto/query"
    27  	topodatapb "vitess.io/vitess/go/vt/proto/topodata"
    28  )
    29  
    30  // keyRangeFilterFunc returns a function that calls callback only if statements
    31  // in the transaction match the specified keyrange. The resulting function can be
    32  // passed into the Streamer: bls.Stream(file, pos, sendTransaction) ->
    33  // bls.Stream(file, pos, keyRangeFilterFunc(keyrange, sendTransaction))
    34  func keyRangeFilterFunc(keyrange *topodatapb.KeyRange, callback func(*binlogdatapb.BinlogTransaction) error) sendTransactionFunc {
    35  	return func(eventToken *querypb.EventToken, statements []FullBinlogStatement) error {
    36  		matched := false
    37  		filtered := make([]*binlogdatapb.BinlogTransaction_Statement, 0, len(statements))
    38  		for _, statement := range statements {
    39  			switch statement.Statement.Category {
    40  			case binlogdatapb.BinlogTransaction_Statement_BL_SET:
    41  				filtered = append(filtered, statement.Statement)
    42  			case binlogdatapb.BinlogTransaction_Statement_BL_DDL:
    43  				log.Warningf("Not forwarding DDL: %s", statement.Statement.Sql)
    44  				continue
    45  			case binlogdatapb.BinlogTransaction_Statement_BL_INSERT,
    46  				binlogdatapb.BinlogTransaction_Statement_BL_UPDATE,
    47  				binlogdatapb.BinlogTransaction_Statement_BL_DELETE:
    48  				if statement.KeyspaceID == nil {
    49  					updateStreamErrors.Add("KeyRangeStream", 1)
    50  					return fmt.Errorf("SBR mode unsupported for streaming: %s", statement.Statement.Sql)
    51  				}
    52  				if !key.KeyRangeContains(keyrange, statement.KeyspaceID) {
    53  					continue
    54  				}
    55  				filtered = append(filtered, statement.Statement)
    56  				matched = true
    57  			case binlogdatapb.BinlogTransaction_Statement_BL_UNRECOGNIZED:
    58  				updateStreamErrors.Add("KeyRangeStream", 1)
    59  				log.Errorf("Error parsing keyspace id: %s", statement.Statement.Sql)
    60  				continue
    61  			}
    62  		}
    63  		trans := &binlogdatapb.BinlogTransaction{
    64  			EventToken: eventToken,
    65  		}
    66  		if matched {
    67  			trans.Statements = filtered
    68  		}
    69  		return callback(trans)
    70  	}
    71  }