refactor: optimize row handling in mssql extractor and transformer

cmd/go_migrate/process.go

@@ -11,6 +11,7 @@ import (
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
 	dbwrapper "git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db-wrapper"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/extractors"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/table_analyzers"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
 	log "github.com/sirupsen/logrus"
@@ -85,7 +86,6 @@ func processMigrationJob(
 	}
 
 	chJobErrors := make(chan custom_errors.JobError, job.QueueSize)
-	chExtractorErrors := make(chan custom_errors.ExtractorError, job.QueueSize)
 	chLoadersErrors := make(chan custom_errors.LoaderError, job.QueueSize)
 	chPartitions := make(chan models.Partition, job.QueueSize)
 	chBatchesRaw := make(chan models.Batch, job.QueueSize)
@@ -105,15 +105,6 @@ func processMigrationJob(
 		}
 	}()
 
-	go custom_errors.ExtractorErrorHandler(
-		localCtx,
-		job.Retry,
-		job.MaxPartitionErrrors,
-		chExtractorErrors,
-		chPartitions,
-		chJobErrors,
-		&wgActivePartitions,
-	)
 	go custom_errors.LoaderErrorHandler(
 		localCtx,
 		job.Retry,
@@ -129,14 +120,14 @@ func processMigrationJob(
 
 	for range maxExtractors {
 		wgExtractors.Go(func() {
-			extractor.Consume(
+			extractors.Consume(
 				localCtx,
+				extractor,
 				job.SourceTable,
 				sourceColTypes,
 				job.BatchSize,
 				chPartitions,
 				chBatchesRaw,
-				chExtractorErrors,
 				chJobErrors,
 				&wgActivePartitions,
 				&rowsRead,
@@ -190,8 +181,6 @@ func processMigrationJob(
 		log.Debugf("wgActivePartitions is empty (%v)", job.Name)
 		close(chPartitions)
 		log.Debugf("chPartitions is closed (%v)", job.Name)
-		close(chExtractorErrors)
-		log.Debugf("chExtractorErrors is closed (%v)", job.Name)
 
 		wgExtractors.Wait()
 		log.Debugf("wgExtractors is empty (%v)", job.Name)

internal/app/custom_errors/extractor.error.go

@@ -1,13 +1,7 @@
 package custom_errors
 
 import (
-	"context"
-	"fmt"
-	"sync"
-
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
-	"github.com/google/uuid"
 )
 
 type ExtractorError struct {
@@ -20,100 +14,3 @@ type ExtractorError struct {
 func (e *ExtractorError) Error() string {
 	return e.Msg
 }
-
-func ExtractorErrorHandler(
-	ctx context.Context,
-	retryConfig config.RetryConfig,
-	maxPartitionErrors int,
-	chErrorsIn <-chan ExtractorError,
-	chPartitionsOut chan<- models.Partition,
-	chJobErrorsOut chan<- JobError,
-	wgActivePartitions *sync.WaitGroup,
-) {
-	definitiveErrors := 0
-
-	for {
-		if ctx.Err() != nil {
-			return
-		}
-
-		select {
-		case <-ctx.Done():
-			return
-
-		case err, ok := <-chErrorsIn:
-			if !ok {
-				return
-			}
-
-			if err.Partition.RetryCounter >= retryConfig.Attempts {
-				wgActivePartitions.Done()
-				definitiveErrors++
-				jobError := JobError{
-					ShouldCancelJob: false,
-					Msg:             fmt.Sprintf("Partition %v reached max retries (%d)", err.Partition.Id, retryConfig.Attempts),
-					Prev:            &err,
-				}
-
-				select {
-				case chJobErrorsOut <- jobError:
-				case <-ctx.Done():
-					return
-				}
-
-				if maxPartitionErrors > 0 && definitiveErrors >= maxPartitionErrors {
-					fatalError := JobError{
-						ShouldCancelJob: true,
-						Msg:             fmt.Sprintf("Partition error limit reached (%d)", maxPartitionErrors),
-						Prev:            &err,
-					}
-
-					select {
-					case chJobErrorsOut <- fatalError:
-					case <-ctx.Done():
-						return
-					}
-				}
-
-				continue
-			} else {
-				jobError := JobError{
-					ShouldCancelJob: false,
-					Msg:             fmt.Sprintf("Temporal error in partition %v (retries: %d)", err.Partition.Id, err.Partition.RetryCounter),
-					Prev:            &err,
-				}
-
-				select {
-				case chJobErrorsOut <- jobError:
-				case <-ctx.Done():
-					return
-				}
-			}
-
-			newPartition := err.Partition
-			newPartition.RetryCounter++
-
-			delay := computeBackoffDelay(
-				newPartition.RetryCounter,
-				retryConfig.BaseDelayMs,
-				retryConfig.MaxDelayMs,
-				retryConfig.MaxJitterMs,
-			)
-
-			if err.HasLastId {
-				newPartition.ParentId = err.Partition.Id
-				newPartition.Id = uuid.New()
-				newPartition.Range.Min = err.LastId
-				newPartition.Range.IsMinInclusive = false
-			}
-
-			requeueWithBackoff(ctx, delay, func() {
-				select {
-				case chPartitionsOut <- newPartition:
-				case <-ctx.Done():
-					return
-				}
-			})
-		}
-	}
-}

internal/app/etl/extractors/consumer.go

@@ -0,0 +1,92 @@
+package extractors
+
+import (
+	"context"
+	"errors"
+	"slices"
+	"strings"
+	"sync"
+	"sync/atomic"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+)
+
+func Consume(
+	ctx context.Context,
+	extractor etl.Extractor,
+	tableInfo config.SourceTableInfo,
+	columns []models.ColumnType,
+	batchSize int,
+	chPartitionsIn <-chan models.Partition,
+	chBatchesOut chan<- models.Batch,
+	chErrorsOut chan<- custom_errors.JobError,
+	wgActivePartitions *sync.WaitGroup,
+	rowsRead *int64,
+) {
+	indexPrimaryKey := slices.IndexFunc(columns, func(col models.ColumnType) bool {
+		return strings.EqualFold(col.Name(), tableInfo.PrimaryKey)
+	})
+
+	if indexPrimaryKey == -1 {
+		select {
+		case <-ctx.Done():
+			return
+		case chErrorsOut <- custom_errors.JobError{
+			ShouldCancelJob: true,
+			Msg:             "Primary key not found in provided columns",
+		}:
+		}
+		return
+	}
+
+	for {
+		if ctx.Err() != nil {
+			return
+		}
+
+		select {
+		case <-ctx.Done():
+			return
+		case partition, ok := <-chPartitionsIn:
+			if !ok {
+				return
+			}
+
+			rowsReadResult, err := extractWithRetries(
+				ctx,
+				extractor,
+				tableInfo,
+				columns,
+				batchSize,
+				partition,
+				indexPrimaryKey,
+				chBatchesOut,
+			)
+			wgActivePartitions.Done()
+
+			if rowsReadResult > 0 {
+				atomic.AddInt64(rowsRead, rowsReadResult)
+			}
+
+			if err != nil {
+				var jobError *custom_errors.JobError
+				if errors.As(err, &jobError) {
+					select {
+					case <-ctx.Done():
+						return
+					case chErrorsOut <- *jobError:
+					}
+				} else {
+					select {
+					case <-ctx.Done():
+						return
+					case chErrorsOut <- custom_errors.JobError{ShouldCancelJob: false, Msg: err.Error(), Prev: err}:
+					}
+				}
+			}
+		}
+	}
+}

internal/app/etl/extractors/extract-with-retries.go

@@ -0,0 +1,70 @@
+package extractors
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+	"github.com/google/uuid"
+)
+
+func extractWithRetries(
+	ctx context.Context,
+	extractor etl.Extractor,
+	tableInfo config.SourceTableInfo,
+	columns []models.ColumnType,
+	batchSize int,
+	partition models.Partition,
+	indexPrimaryKey int,
+	chBatchesOut chan<- models.Batch,
+) (int64, error) {
+	var totalRowsRead int64
+	delay := time.Duration(time.Second * 1)
+	currentParitition := partition
+
+	for {
+		rowsRead, err := extractor.Exec(
+			ctx,
+			tableInfo,
+			columns,
+			batchSize,
+			currentParitition,
+			indexPrimaryKey,
+			chBatchesOut,
+		)
+		totalRowsRead += rowsRead
+
+		if err == nil {
+			return totalRowsRead, nil
+		}
+
+		var exError *custom_errors.ExtractorError
+		if errors.As(err, &exError) {
+			currentParitition.RetryCounter++
+
+			if currentParitition.RetryCounter > 3 {
+				return totalRowsRead, &custom_errors.JobError{
+					Msg:  fmt.Sprintf("Partition %v reached max retries", exError.Partition.Id),
+					Prev: err,
+				}
+			}
+
+			if exError.HasLastId {
+				currentParitition.ParentId = exError.Partition.Id
+				currentParitition.Id = uuid.New()
+				currentParitition.Range.Min = exError.LastId
+				currentParitition.Range.IsMinInclusive = false
+			}
+
+			time.Sleep(delay)
+			continue
+		}
+
+		return totalRowsRead, err
+	}
+}

internal/app/etl/extractors/main.go

@@ -0,0 +1,64 @@
+package extractors
+
+import (
+	"context"
+	"fmt"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/convert"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+	"github.com/google/uuid"
+)
+
+func errorFromLastPartitionRow(
+	lastRow models.UnknownRowValues,
+	indexPrimaryKey int,
+	partition models.Partition,
+	previousError error,
+) error {
+	lastIdRawValue := lastRow[indexPrimaryKey]
+
+	lastId, ok := convert.ToInt64(lastIdRawValue)
+	if !ok {
+		currentPartition := partition
+		currentPartition.RetryCounter = 3
+		return &custom_errors.ExtractorError{
+			Partition: currentPartition,
+			HasLastId: true,
+			Msg:       fmt.Sprintf("Couldn't cast last id value as int: %s", previousError.Error()),
+		}
+
+	}
+
+	return &custom_errors.ExtractorError{
+		Partition: partition,
+		HasLastId: true,
+		LastId:    lastId,
+		Msg:       previousError.Error(),
+	}
+}
+
+func sendBatch(ctx context.Context, chBatchesOut chan<- models.Batch, batch models.Batch) error {
+	select {
+	case chBatchesOut <- batch:
+		return nil
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+}
+
+func flush(
+	ctx context.Context,
+	partition *models.Partition,
+	batchSize int,
+	batchRows []models.UnknownRowValues,
+	chBatchesOut chan<- models.Batch,
+) error {
+	if len(batchRows) == 0 {
+		return nil
+	}
+
+	batch := models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows}
+	batchRows = make([]models.UnknownRowValues, 0, batchSize)
+	return sendBatch(ctx, chBatchesOut, batch)
+}

internal/app/etl/extractors/mssql.go

@@ -3,21 +3,13 @@ package extractors
 import (
 	"context"
 	"database/sql"
-	"errors"
 	"fmt"
-	"slices"
 	"strings"
-	"sync"
-	"sync/atomic"
-	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/convert"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
 	dbwrapper "git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db-wrapper"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
-	"github.com/google/uuid"
 )
 
 type MssqlExtractor struct {
@@ -72,35 +64,7 @@ func buildExtractQueryMssql(
 	return sbQuery.String()
 }
 
-func errorFromLastRow(
-	lastRow models.UnknownRowValues,
-	indexPrimaryKey int,
-	partition models.Partition,
-	previousError error,
-) *custom_errors.ExtractorError {
-	lastIdRawValue := lastRow[indexPrimaryKey]
-
-	lastId, ok := convert.ToInt64(lastIdRawValue)
-	if !ok {
-		currentPartition := partition
-		currentPartition.RetryCounter = 3
-		return &custom_errors.ExtractorError{
-			Partition: currentPartition,
-			HasLastId: true,
-			Msg:       fmt.Sprintf("Couldn't cast last id value as int: %s", previousError.Error()),
-		}
-
-	}
-
-	return &custom_errors.ExtractorError{
-		Partition: partition,
-		HasLastId: true,
-		LastId:    lastId,
-		Msg:       previousError.Error(),
-	}
-}
-
-func (mssqlEx *MssqlExtractor) Extract(
+func (mssqlEx *MssqlExtractor) Exec(
 	ctx context.Context,
 	tableInfo config.SourceTableInfo,
 	columns []models.ColumnType,
@@ -113,212 +77,45 @@ func (mssqlEx *MssqlExtractor) Extract(
 
 	var queryArgs []any
 	if partition.HasRange {
-		queryArgs = append(queryArgs,
-			sql.Named("min", partition.Range.Min),
-			sql.Named("max", partition.Range.Max),
-		)
+		queryArgs = append(queryArgs, sql.Named("min", partition.Range.Min), sql.Named("max", partition.Range.Max))
 	}
 
-	var rowsRead int64 = 0
 	rows, err := mssqlEx.db.Query(ctx, query, queryArgs...)
 	if err != nil {
-		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
+		return 0, err
 	}
 	defer rows.Close()
 
 	batchRows := make([]models.UnknownRowValues, 0, batchSize)
+	var rowsRead int64 = 0
 
 	for rows.Next() {
-		rowValues := make([]any, len(columns))
-		scanArgs := make([]any, len(columns))
-
-		for i := range rowValues {
-			scanArgs[i] = &rowValues[i]
+		values, err := rows.Values()
+		if err != nil {
+			if len(batchRows) == 0 {
+				return rowsRead, err
 			}
 
-		if err := rows.Scan(scanArgs...); err != nil {
-			if len(batchRows) == 0 {
-				return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
+			if err := flush(ctx, &partition, batchSize, batchRows, chBatchesOut); err != nil {
+				return rowsRead, err
 			}
 
 			lastRow := batchRows[len(batchRows)-1]
-
-			select {
-			case chBatchesOut <- models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows, RetryCounter: 0}:
-			case <-ctx.Done():
-				return rowsRead, ctx.Err()
-			}
-
-			return rowsRead, errorFromLastRow(lastRow, indexPrimaryKey, partition, err)
+			return rowsRead, errorFromLastPartitionRow(lastRow, indexPrimaryKey, partition, err)
 		}
 		rowsRead++
 
-		batchRows = append(batchRows, rowValues)
+		batchRows = append(batchRows, values)
 		if len(batchRows) >= batchSize {
-			select {
-			case chBatchesOut <- models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows, RetryCounter: 0}:
-			case <-ctx.Done():
-				return rowsRead, ctx.Err()
+			if err := flush(ctx, &partition, batchSize, batchRows, chBatchesOut); err != nil {
+				return rowsRead, err
 			}
-
-			batchRows = make([]models.UnknownRowValues, 0, batchSize)
-		}
-
-	}
-
-	if err := rows.Err(); err != nil {
-		if errors.Is(err, ctx.Err()) {
-			return rowsRead, ctx.Err()
-		}
-
-		if len(batchRows) > 0 {
-			lastRow := batchRows[len(batchRows)-1]
-			return rowsRead, errorFromLastRow(lastRow, indexPrimaryKey, partition, err)
-		}
-
-		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
-	}
-
-	if len(batchRows) > 0 {
-		select {
-		case chBatchesOut <- models.Batch{Id: uuid.New(), PartitionId: partition.Id, Rows: batchRows, RetryCounter: 0}:
-		case <-ctx.Done():
-			return rowsRead, ctx.Err()
 		}
 	}
 
-	return rowsRead, nil
+	if err := flush(ctx, &partition, batchSize, batchRows, chBatchesOut); err != nil {
+		return rowsRead, err
 	}
 
-func (mssqlEx *MssqlExtractor) ExtractWithRetries(
-	ctx context.Context,
-	tableInfo config.SourceTableInfo,
-	columns []models.ColumnType,
-	batchSize int,
-	partition models.Partition,
-	indexPrimaryKey int,
-	chBatchesOut chan<- models.Batch,
-) (int64, error) {
-	var totalRowsRead int64
-	var fatalErr error
-	delay := time.Duration(time.Second * 1)
-	currentParitition := partition
-
-	for fatalErr != nil || currentParitition.RetryCounter < 3 {
-		currentParitition.RetryCounter++
-		rowsRead, err := mssqlEx.Extract(
-			ctx,
-			tableInfo,
-			columns,
-			batchSize,
-			currentParitition,
-			indexPrimaryKey,
-			chBatchesOut,
-		)
-
-		if rowsRead > 0 {
-			totalRowsRead += int64(rowsRead)
-		}
-
-		if err != nil {
-			var exError *custom_errors.ExtractorError
-			if errors.As(err, &exError) {
-				if exError.HasLastId {
-					currentParitition.ParentId = exError.Partition.Id
-					currentParitition.Id = uuid.New()
-					currentParitition.Range.Min = exError.LastId
-					currentParitition.Range.IsMinInclusive = false
-				}
-
-				time.Sleep(delay)
-			} else {
-				fatalErr = err
-			}
-
-			continue
-		}
-
-		break
-	}
-
-	return totalRowsRead, fatalErr
-}
-
-func (mssqlEx *MssqlExtractor) Consume(
-	ctx context.Context,
-	tableInfo config.SourceTableInfo,
-	columns []models.ColumnType,
-	batchSize int,
-	chPartitionsIn <-chan models.Partition,
-	chBatchesOut chan<- models.Batch,
-	chJobErrorsOut chan<- custom_errors.JobError,
-	wgActivePartitions *sync.WaitGroup,
-	rowsRead *int64,
-) {
-	indexPrimaryKey := slices.IndexFunc(columns, func(col models.ColumnType) bool {
-		return strings.EqualFold(col.Name(), tableInfo.PrimaryKey)
-	})
-
-	if indexPrimaryKey == -1 {
-		select {
-		case <-ctx.Done():
-			return
-		case chJobErrorsOut <- custom_errors.JobError{
-			ShouldCancelJob: true,
-			Msg:             "Primary key not found in provided columns",
-		}:
-		}
-
-		return
-	}
-
-	for {
-		if ctx.Err() != nil {
-			return
-		}
-
-		select {
-		case <-ctx.Done():
-			return
-		case partition, ok := <-chPartitionsIn:
-			if !ok {
-				return
-			}
-
-			rowsReadResult, err := mssqlEx.ExtractWithRetries(
-				ctx,
-				tableInfo,
-				columns,
-				batchSize,
-				partition,
-				indexPrimaryKey,
-				chBatchesOut,
-			)
-
-			if rowsReadResult > 0 {
-				atomic.AddInt64(rowsRead, int64(rowsReadResult))
-			}
-
-			if err != nil {
-				var jobError *custom_errors.JobError
-				if errors.As(err, &jobError) {
-					select {
-					case <-ctx.Done():
-						return
-					case chJobErrorsOut <- *jobError:
-					}
-				} else {
-					select {
-					case <-ctx.Done():
-						return
-					case chJobErrorsOut <- custom_errors.JobError{ShouldCancelJob: false, Msg: err.Error(), Prev: err}:
-					}
-				}
-
-				continue
-			}
-
-			wgActivePartitions.Done()
-		}
-	}
+	return rowsRead, rows.Err()
 }

internal/app/etl/extractors/postgres.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"strings"
-	"sync"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
@@ -51,7 +50,7 @@ func buildExtractQueryPostgres(sourceDbInfo config.SourceTableInfo, columns []mo
 	return fmt.Sprintf(`SELECT %s FROM "%s"."%s"  ORDER BY "%s" ASC`, sbColumns.String(), sourceDbInfo.Schema, sourceDbInfo.Table, sourceDbInfo.PrimaryKey)
 }
 
-func (postgresEx *PostgresExtractor) Extract(
+func (postgresEx *PostgresExtractor) Exec(
 	ctx context.Context,
 	tableInfo config.SourceTableInfo,
 	columns []models.ColumnType,
@@ -59,14 +58,14 @@ func (postgresEx *PostgresExtractor) Extract(
 	partition models.Partition,
 	indexPrimaryKey int,
 	chBatchesOut chan<- models.Batch,
-) (int, error) {
+) (int64, error) {
 	query := buildExtractQueryPostgres(tableInfo, columns)
 
 	if partition.HasRange {
 		return 0, errors.New("Batch config not yet supported")
 	}
 
-	rowsRead := 0
+	var rowsRead int64 = 0
 	rows, err := postgresEx.db.Query(ctx, query)
 	if err != nil {
 		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
@@ -109,17 +108,3 @@ func (postgresEx *PostgresExtractor) Extract(
 
 	return rowsRead, nil
 }
-
-func (postgresEx *PostgresExtractor) Consume(
-	ctx context.Context,
-	tableInfo config.SourceTableInfo,
-	columns []models.ColumnType,
-	batchSize int,
-	chPartitionsIn <-chan models.Partition,
-	chBatchesOut chan<- models.Batch,
-	chErrorsOut chan<- custom_errors.ExtractorError,
-	chJobErrorsOut chan<- custom_errors.JobError,
-	wgActivePartitions *sync.WaitGroup,
-	rowsRead *int64,
-) {
-}

internal/app/etl/transformers/mssql.go

@@ -74,6 +74,10 @@ func (mssqlTr *MssqlTransformer) ProcessBatch(
 			}
 		}
 
+		if rowValues == nil {
+			continue
+		}
+
 		for _, task := range transformationPlan {
 			val := rowValues[task.Index]
 			if val == nil {

internal/app/etl/types.go

@@ -10,7 +10,7 @@ import (
 )
 
 type Extractor interface {
-	Extract(
+	Exec(
 		ctx context.Context,
 		tableInfo config.SourceTableInfo,
 		columns []models.ColumnType,
@@ -19,28 +19,6 @@ type Extractor interface {
 		indexPrimaryKey int,
 		chBatchesOut chan<- models.Batch,
 	) (int64, error)
-
-	ExtractWithRetries(
-		ctx context.Context,
-		tableInfo config.SourceTableInfo,
-		columns []models.ColumnType,
-		batchSize int,
-		partition models.Partition,
-		indexPrimaryKey int,
-		chBatchesOut chan<- models.Batch,
-	) (int64, error)
-
-	Consume(
-		ctx context.Context,
-		tableInfo config.SourceTableInfo,
-		columns []models.ColumnType,
-		batchSize int,
-		chPartitionsIn <-chan models.Partition,
-		chBatchesOut chan<- models.Batch,
-		chJobErrorsOut chan<- custom_errors.JobError,
-		wgActivePartitions *sync.WaitGroup,
-		rowsRead *int64,
-	)
 }
 
 type TransformerFunc func(any) (any, error)