update extractor interface

cmd/go_migrate/connect.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"github.com/jackc/pgx/v5/pgxpool"
+	_ "github.com/microsoft/go-mssqldb"
+	log "github.com/sirupsen/logrus"
+)
+
+func connectToSqlServer() (*sql.DB, error) {
+	db, err := sql.Open("sqlserver", config.App.SourceDbUrl)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to connect to sqlserver: %w", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+
+	if err := db.PingContext(ctx); err != nil {
+		return nil, fmt.Errorf("Unable to ping sqlserver: %w", err)
+	}
+
+	return db, nil
+}
+
+func connectToPostgres() (*pgxpool.Pool, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+
+	pool, err := pgxpool.New(ctx, config.App.TargetDbUrl)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to connect to postgres: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("Unable to ping postgres: %w", err)
+	}
+
+	return pool, nil
+}
+
+func connectToDatabases() (*sql.DB, *pgxpool.Pool, error) {
+	var sourceDbErr, targetDbErr error
+	var sourceDb *sql.DB
+	var targetDb *pgxpool.Pool
+	var wg sync.WaitGroup
+
+	wg.Go(func() {
+		sourceDb, sourceDbErr = connectToSqlServer()
+		if sourceDbErr != nil {
+			log.Error("Unable to connect to source db: ", sourceDbErr)
+		}
+	})
+
+	wg.Go(func() {
+		targetDb, targetDbErr = connectToPostgres()
+		if targetDbErr != nil {
+			log.Error("Unable to connect to target db: ", targetDbErr)
+		}
+	})
+
+	wg.Wait()
+
+	if sourceDbErr != nil || targetDbErr != nil {
+		return nil, nil, errors.New("Unable to connect to databases")
+	}
+
+	return sourceDb, targetDb, nil
+}

cmd/go_migrate/main.go

@@ -11,7 +11,6 @@ import (
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/loaders"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/table_analyzers"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/transformers"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/sync/errgroup"
 )
@@ -96,10 +95,10 @@ func processMigrationJobs(
 	targetDb dbwrapper.DbWrapper,
 	jobs []config.Job,
 	maxParallelWorkers int,
-) []models.JobResult {
+) []JobResult {
 	if len(jobs) == 0 {
 		log.Info("No migration jobs configured")
-		return []models.JobResult{}
+		return []JobResult{}
 	}
 
 	if maxParallelWorkers <= 0 {
@@ -112,7 +111,7 @@ func processMigrationJobs(
 
 	log.Infof("Starting migration with %d parallel worker(s)", maxParallelWorkers)
 
-	chJobResults := make(chan models.JobResult, len(jobs))
+	chJobResults := make(chan JobResult, len(jobs))
 	chJobs := make(chan config.Job, len(jobs))
 	var wgJobs sync.WaitGroup
 
@@ -120,7 +119,7 @@ func processMigrationJobs(
 	targetTableAnalyzer := table_analyzers.NewPostgresTableAnalyzer(targetDb)
 	extractor := extractors.NewMssqlExtractor(sourceDb)
 	transformer := transformers.NewMssqlTransformer()
-	loader := loaders.NewGenericLoader(targetDb)
+	loader := loaders.NewPostgresLoader(targetDb)
 
 	for i := range maxParallelWorkers {
 		wgJobs.Go(func() {
@@ -152,7 +151,7 @@ func processMigrationJobs(
 		close(chJobResults)
 	}()
 
-	var finalResults []models.JobResult
+	var finalResults []JobResult
 	for res := range chJobResults {
 		finalResults = append(finalResults, res)
 	}

cmd/go_migrate/metrics.go

@@ -0,0 +1,13 @@
+package main
+
+import "time"
+
+type JobResult struct {
+	JobName    string
+	StartTime  time.Time
+	Duration   time.Duration
+	RowsRead   int64
+	RowsLoaded int64
+	RowsFailed int64
+	Error      error
+}

cmd/go_migrate/process.go

@@ -26,11 +26,11 @@ func processMigrationJob(
 	transformer etl.Transformer,
 	loader etl.Loader,
 	job config.Job,
-) models.JobResult {
+) JobResult {
 	localCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	result := models.JobResult{
+	result := JobResult{
 		JobName:   job.Name,
 		StartTime: time.Now(),
 	}
@@ -129,7 +129,7 @@ func processMigrationJob(
 
 	for range maxExtractors {
 		wgExtractors.Go(func() {
-			extractor.Exec(
+			extractor.Consume(
 				localCtx,
 				job.SourceTable,
 				sourceColTypes,

config.yaml

@@ -1,6 +1,6 @@
 max_parallel_workers: 4
 source_db_type: sqlserver
-target_db_type: sqlserver
+target_db_type: postgres
 
 defaults:
   max_extractors: 2

internal/app/etl/extractors/mssql.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"sync"
 	"sync/atomic"
+	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/convert"
@@ -43,9 +44,9 @@ func buildExtractQueryMssql(
 		for i, col := range columns {
 			fmt.Fprintf(&sbQuery, "[%s]", col.Name())
 
-			// if col.Type() == "GEOMETRY" {
+			if col.Type() == "GEOMETRY" {
-			// 	fmt.Fprintf(&sbQuery, ".STAsBinary() AS [%s]", col.Name())
+				fmt.Fprintf(&sbQuery, ".STAsBinary() AS [%s]", col.Name())
-			// }
+			}
 
 			if i < len(columns)-1 {
 				sbQuery.WriteString(", ")
@@ -99,7 +100,7 @@ func errorFromLastRow(
 	}
 }
 
-func (mssqlEx *MssqlExtractor) ProcessPartition(
+func (mssqlEx *MssqlExtractor) Extract(
 	ctx context.Context,
 	tableInfo config.SourceTableInfo,
 	columns []models.ColumnType,
@@ -107,7 +108,7 @@ func (mssqlEx *MssqlExtractor) ProcessPartition(
 	partition models.Partition,
 	indexPrimaryKey int,
 	chBatchesOut chan<- models.Batch,
-) (int, error) {
+) (int64, error) {
 	query := buildExtractQueryMssql(tableInfo, columns, partition.HasRange, partition.Range.IsMinInclusive)
 
 	var queryArgs []any
@@ -118,7 +119,7 @@ func (mssqlEx *MssqlExtractor) ProcessPartition(
 		)
 	}
 
-	rowsRead := 0
+	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()}
@@ -189,14 +190,67 @@ func (mssqlEx *MssqlExtractor) ProcessPartition(
 	return rowsRead, nil
 }
 
-func (mssqlEx *MssqlExtractor) Exec(
+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,
-	chErrorsOut chan<- custom_errors.ExtractorError,
 	chJobErrorsOut chan<- custom_errors.JobError,
 	wgActivePartitions *sync.WaitGroup,
 	rowsRead *int64,
@@ -231,7 +285,7 @@ func (mssqlEx *MssqlExtractor) Exec(
 				return
 			}
 
-			rowsReadResult, err := mssqlEx.ProcessPartition(
+			rowsReadResult, err := mssqlEx.ExtractWithRetries(
 				ctx,
 				tableInfo,
 				columns,
@@ -246,15 +300,8 @@ func (mssqlEx *MssqlExtractor) Exec(
 			}
 
 			if err != nil {
-				var exError *custom_errors.ExtractorError
 				var jobError *custom_errors.JobError
-				if errors.As(err, &exError) {
+				if errors.As(err, &jobError) {
-					select {
-					case <-ctx.Done():
-						return
-					case chErrorsOut <- *exError:
-					}
-				} else if errors.As(err, &jobError) {
 					select {
 					case <-ctx.Done():
 						return
@@ -264,7 +311,7 @@ func (mssqlEx *MssqlExtractor) Exec(
 					select {
 					case <-ctx.Done():
 						return
-					case chErrorsOut <- custom_errors.ExtractorError{Partition: partition, Msg: err.Error()}:
+					case chJobErrorsOut <- custom_errors.JobError{ShouldCancelJob: false, Msg: err.Error(), Prev: err}:
 					}
 				}
 

internal/app/etl/extractors/postgres.go

@@ -51,7 +51,7 @@ 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) ProcessPartition(
+func (postgresEx *PostgresExtractor) Extract(
 	ctx context.Context,
 	tableInfo config.SourceTableInfo,
 	columns []models.ColumnType,
@@ -110,7 +110,7 @@ func (postgresEx *PostgresExtractor) ProcessPartition(
 	return rowsRead, nil
 }
 
-func (postgresEx *PostgresExtractor) Exec(
+func (postgresEx *PostgresExtractor) Consume(
 	ctx context.Context,
 	tableInfo config.SourceTableInfo,
 	columns []models.ColumnType,

internal/app/etl/loaders/postgres.go

@@ -15,21 +15,31 @@ import (
 	"github.com/jackc/pgx/v5/pgconn"
 )
 
-type GenericLoader struct {
+type PostgresLoader struct {
 	db dbwrapper.DbWrapper
 }
 
-func NewGenericLoader(db dbwrapper.DbWrapper) etl.Loader {
+func NewPostgresLoader(db dbwrapper.DbWrapper) etl.Loader {
-	return &GenericLoader{db: db}
+	return &PostgresLoader{db: db}
 }
 
-func (gl *GenericLoader) ProcessBatch(
+func mapSlice[T any, V any](input []T, mapper func(T) V) []V {
+	result := make([]V, len(input))
+
+	for i, v := range input {
+		result[i] = mapper(v)
+	}
+
+	return result
+}
+
+func (postgresLd *PostgresLoader) ProcessBatch(
 	ctx context.Context,
 	tableInfo config.TargetTableInfo,
 	colNames []string,
 	batch models.Batch,
 ) (int, error) {
-	_, err := gl.db.SaveMassive(
+	_, err := postgresLd.db.SaveMassive(
 		ctx,
 		tableInfo.Schema,
 		tableInfo.Table,
@@ -55,7 +65,7 @@ func (gl *GenericLoader) ProcessBatch(
 	return len(batch.Rows), nil
 }
 
-func (gl *GenericLoader) Exec(
+func (postgresLd *PostgresLoader) Exec(
 	ctx context.Context,
 	tableInfo config.TargetTableInfo,
 	columns []models.ColumnType,
@@ -82,7 +92,7 @@ func (gl *GenericLoader) Exec(
 				return
 			}
 
-			processedRows, err := gl.ProcessBatch(ctx, tableInfo, colNames, batch)
+			processedRows, err := postgresLd.ProcessBatch(ctx, tableInfo, colNames, batch)
 
 			if err != nil {
 				var ldError *custom_errors.LoaderError

internal/app/etl/loaders/types.go

@@ -0,0 +1 @@
+package loaders

internal/app/etl/loaders/utils.go

@@ -1,11 +0,0 @@
-package loaders
-
-func mapSlice[T any, V any](input []T, mapper func(T) V) []V {
-	result := make([]V, len(input))
-
-	for i, v := range input {
-		result[i] = mapper(v)
-	}
-
-	return result
-}

internal/app/etl/table_analyzers/mssql.go

@@ -39,8 +39,6 @@ JOIN sys.schemas s ON st.schema_id = s.schema_id
 WHERE s.name = @schema AND st.name = @table AND (c.is_hidden = 0 OR (c.graph_type IS NOT NULL AND c.name LIKE '$%'))
 ORDER BY c.column_id;`
 
-// AND c.name NOT LIKE '$%'
-
 type rawColumnMssql struct {
 	name       string
 	userType   string

internal/app/etl/transformers/mssql.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"sync"
+	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/custom_errors"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
@@ -17,7 +18,46 @@ func NewMssqlTransformer() etl.Transformer {
 }
 
 func computeTransformationPlan(columns []models.ColumnType) []etl.ColumnTransformPlan {
-	return []etl.ColumnTransformPlan{}
+	var plan []etl.ColumnTransformPlan
+
+	for i, col := range columns {
+		switch col.SystemType() {
+		case "uniqueidentifier":
+			plan = append(plan, etl.ColumnTransformPlan{
+				Index: i,
+				Fn: func(v any) (any, error) {
+					if b, ok := v.([]byte); ok && b != nil {
+						return mssqlUuidToBigEndian(b)
+					}
+					return v, nil
+				},
+			})
+
+		case "geometry", "geography":
+			plan = append(plan, etl.ColumnTransformPlan{
+				Index: i,
+				Fn: func(v any) (any, error) {
+					if b, ok := v.([]byte); ok && b != nil {
+						return wkbToEwkbWithSrid(b, 4326)
+					}
+					return v, nil
+				},
+			})
+
+		case "datetime", "datetime2":
+			plan = append(plan, etl.ColumnTransformPlan{
+				Index: i,
+				Fn: func(v any) (any, error) {
+					if t, ok := v.(time.Time); ok {
+						return ensureUTC(t), nil
+					}
+					return v, nil
+				},
+			})
+		}
+	}
+
+	return plan
 }
 
 const processBatchCtxCheck = 4096

internal/app/etl/types.go

@@ -10,7 +10,7 @@ import (
 )
 
 type Extractor interface {
-	ProcessPartition(
+	Extract(
 		ctx context.Context,
 		tableInfo config.SourceTableInfo,
 		columns []models.ColumnType,
@@ -18,16 +18,25 @@ type Extractor interface {
 		partition models.Partition,
 		indexPrimaryKey int,
 		chBatchesOut chan<- models.Batch,
-	) (int, error)
+	) (int64, error)
 
-	Exec(
+	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,
-		chErrorsOut chan<- custom_errors.ExtractorError,
 		chJobErrorsOut chan<- custom_errors.JobError,
 		wgActivePartitions *sync.WaitGroup,
 		rowsRead *int64,

internal/app/models/main.go

@@ -1,10 +1,6 @@
 package models
 
-import (
+import "github.com/google/uuid"
-	"time"
-
-	"github.com/google/uuid"
-)
 
 type UnknownRowValues = []any
 
@@ -29,13 +25,3 @@ type Partition struct {
 	HasRange     bool
 	RetryCounter int
 }
-
-type JobResult struct {
-	JobName    string
-	StartTime  time.Time
-	Duration   time.Duration
-	RowsRead   int64
-	RowsLoaded int64
-	RowsFailed int64
-	Error      error
-}