feat: add backoff package for retry logic and implement example usage in new backoff-test script

.gitignore

@@ -4,7 +4,6 @@
 *.dll
 *.so
 *.dylib
-bin/
 
 # Test binary, built with `go test -c`
 *.test

Makefile

@@ -1,80 +0,0 @@
-.PHONY: build build-linux build-windows build-all clean help
-
-# Variables
-BINARY_NAME=go-migrate
-CMD_PATH=./cmd/go_migrate
-OUTPUT_DIR=bin
-VERSION?=$(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
-BUILD_TIME=$(shell date -u '+%Y-%m-%d_%H:%M:%S')
-GIT_COMMIT=$(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
-
-# Flags de compilación
-LD_FLAGS=-ldflags="-s -w -X main.Version=$(VERSION) -X main.BuildTime=$(BUILD_TIME) -X main.GitCommit=$(GIT_COMMIT)"
-
-# Default: compilar para el SO actual
-build: build-$(OS)
-
-ifeq ($(OS),Windows_NT)
-build-native: build-windows
-else
-build-native: build-linux
-endif
-
-# Compilar para Linux (sin CGO para máxima compatibilidad)
-build-linux:
-	@echo "Compilando para Linux..."
-	@mkdir -p $(OUTPUT_DIR)
-	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
-		$(LD_FLAGS) \
-		-o $(OUTPUT_DIR)/$(BINARY_NAME)-linux-amd64 \
-		$(CMD_PATH)
-	@echo "Binario creado: $(OUTPUT_DIR)/$(BINARY_NAME)-linux-amd64"
-
-# Compilar para Windows
-build-windows:
-	@echo "Compilando para Windows..."
-	@mkdir -p $(OUTPUT_DIR)
-	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build \
-		$(LD_FLAGS) \
-		-o $(OUTPUT_DIR)/$(BINARY_NAME)-windows-amd64.exe \
-		$(CMD_PATH)
-	@echo "Binario creado: $(OUTPUT_DIR)/$(BINARY_NAME)-windows-amd64.exe"
-
-# Compilar para ambas plataformas
-build-all: build-linux build-windows
-	@echo ""
-	@echo "Binarios compilados:"
-	@ls -lh $(OUTPUT_DIR)/$(BINARY_NAME)*
-
-# Compilar para Linux arm64 (opcional, para Raspberry Pi, etc.)
-build-linux-arm64:
-	@echo "Compilando para Linux ARM64..."
-	@mkdir -p $(OUTPUT_DIR)
-	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build \
-		$(LD_FLAGS) \
-		-o $(OUTPUT_DIR)/$(BINARY_NAME)-linux-arm64 \
-		$(CMD_PATH)
-	@echo "Binario creado: $(OUTPUT_DIR)/$(BINARY_NAME)-linux-arm64"
-
-# Limpiar binarios
-clean:
-	@echo "Limpiando binarios..."
-	@rm -rf $(OUTPUT_DIR)
-	@echo "Limpieza completada"
-
-# Ayuda
-help:
-	@echo "Comandos disponibles:"
-	@echo ""
-	@echo "  make build              - Compilar para el SO actual (Linux/Windows)"
-	@echo "  make build-linux        - Compilar para Linux x86_64"
-	@echo "  make build-windows      - Compilar para Windows x86_64"
-	@echo "  make build-linux-arm64  - Compilar para Linux ARM64 (opcional)"
-	@echo "  make build-all          - Compilar para Linux y Windows"
-	@echo "  make clean              - Eliminar binarios compilados"
-	@echo "  make help               - Mostrar esta ayuda"
-	@echo ""
-	@echo "Ejemplos de uso:"
-	@echo "  make build-all          # Crear binarios para ambas plataformas"
-	@echo "  make build-linux OS=    # Crear solo para Linux"
-	@echo ""

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

@@ -2,18 +2,18 @@ package main
 
 import (
 	"context"
+	"database/sql"
 	"sync"
 	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db-wrapper"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/extractors"
 	"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"
+	"github.com/jackc/pgx/v5/pgxpool"
 	log "github.com/sirupsen/logrus"
-	"golang.org/x/sync/errgroup"
 )
 
 func main() {
@@ -33,33 +33,11 @@ func main() {
 
 	log.Info("=== Starting migration ===")
 
-	var wgConnect errgroup.Group
+	sourceDb, targetDb, connError := connectToDatabases()
-	var sourceDb, targetDb dbwrapper.DbWrapper
+	if connError != nil {
-
+		log.Fatal("Connection error: ", connError)
-	wgConnect.Go(func() error {
-		var err error
-		sourceDb, err = connectWithTimeout(ctx, migrationConfig.SourceDbType, config.App.SourceDbUrl, 20*time.Second)
-		if err != nil {
-			return err
-		}
-
-		return nil
-	})
-
-	wgConnect.Go(func() error {
-		var err error
-		targetDb, err = connectWithTimeout(ctx, migrationConfig.TargetDbType, config.App.TargetDbUrl, 20*time.Second)
-		if err != nil {
-			return err
-		}
-
-		return nil
-	})
-
-	if err := wgConnect.Wait(); err != nil {
-		log.Error("Connection error: ", err)
-		return
 	}
+
 	defer sourceDb.Close()
 	defer targetDb.Close()
 
@@ -92,14 +70,14 @@ func main() {
 
 func processMigrationJobs(
 	ctx context.Context,
-	sourceDb dbwrapper.DbWrapper,
+	sourceDb *sql.DB,
-	targetDb dbwrapper.DbWrapper,
+	targetDb *pgxpool.Pool,
 	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 {
@@ -112,15 +90,16 @@ 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
 
+	targetDbWrapper := db.NewPostgresDbWrapper(targetDb)
 	sourceTableAnalyzer := table_analyzers.NewMssqlTableAnalyzer(sourceDb)
 	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() {
@@ -128,7 +107,7 @@ func processMigrationJobs(
 				log.Infof("[worker %d] >>> Processing job: %s.%s <<<", i, job.SourceTable.Schema, job.SourceTable.Table)
 				res := processMigrationJob(
 					ctx,
-					targetDb,
+					targetDbWrapper,
 					sourceTableAnalyzer,
 					targetTableAnalyzer,
 					extractor,
@@ -152,26 +131,10 @@ func processMigrationJobs(
 		close(chJobResults)
 	}()
 
-	var finalResults []models.JobResult
+	var finalResults []JobResult
 	for res := range chJobResults {
 		finalResults = append(finalResults, res)
 	}
 
 	return finalResults
 }
-
-func connectWithTimeout(ctx context.Context, dbType string, dbUrl string, timeout time.Duration) (dbwrapper.DbWrapper, error) {
-	localCtx, cancel := context.WithTimeout(ctx, timeout)
-	defer cancel()
-
-	sourceDb, err := dbwrapper.New(dbType)
-	if err != nil {
-		return nil, err
-	}
-
-	if err = sourceDb.Connect(localCtx, dbUrl); err != nil {
-		return nil, err
-	}
-
-	return sourceDb, nil
-}

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

@@ -2,14 +2,13 @@ package main
 
 import (
 	"context"
-	"fmt"
 	"sync"
 	"sync/atomic"
 	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"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/db"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/table_analyzers"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
@@ -19,18 +18,19 @@ import (
 
 func processMigrationJob(
 	ctx context.Context,
-	targetDbWrapper dbwrapper.DbWrapper,
+	// sourceDbWrapper db.DbWrapper,
+	targetDbWrapper db.DbWrapper,
 	sourceTableAnalyzer etl.TableAnalyzer,
 	targetTableAnalyzer etl.TableAnalyzer,
 	extractor etl.Extractor,
 	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(),
 	}
@@ -234,9 +234,5 @@ func processMigrationJob(
 	result.RowsLoaded = atomic.LoadInt64(&rowsLoaded)
 	result.RowsFailed = atomic.LoadInt64(&rowsFailed)
 
-	if result.RowsRead != result.RowsLoaded {
-		result.Error = fmt.Errorf("Row count mismatch: extracted %d rows but loaded %d rows (failed: %d)", result.RowsRead, result.RowsLoaded, result.RowsFailed)
-	}
-
 	return result
 }

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
@@ -30,12 +30,6 @@ jobs:
       table: MANZANA
     pre_sql: 
       - 'SELECT 1'
-      # - 'TRUNCATE TABLE "Cartografia"."MANZANA"'
-    range:
-      min: 1000000
-      max: 2000000
-      is_min_inclusive: false
-      is_max_inclusive: true
 
   - name: red_puerto
     enabled: true
@@ -48,6 +42,5 @@ jobs:
       table: PUERTO
     pre_sql: 
       - 'SELECT 1'
-      # - 'TRUNCATE TABLE "Red"."PUERTO"'
     post_sql: 
       - "SELECT 1"

go.mod

@@ -15,6 +15,8 @@ require (
 )
 
 require (
+	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 // indirect
 	github.com/golang-sql/sqlexp v0.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect

go.sum

@@ -16,6 +16,10 @@ github.com/alecthomas/assert/v2 v2.10.0 h1:jjRCHsj6hBJhkmhznrCzoNpbA3zqy0fYiUcYZ
 github.com/alecthomas/assert/v2 v2.10.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
 github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
 github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
+github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
+github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=

internal/app/config/migration.go

@@ -50,12 +50,6 @@ type Job struct {
 	PreSQL      []string        `yaml:"pre_sql"`
 	PostSQL     []string        `yaml:"post_sql"`
 	JobConfig   `yaml:",inline"`
-	Range       struct {
-		Min            int64 `yaml:"min"`
-		Max            int64 `yaml:"max"`
-		IsMinInclusive bool  `yaml:"is_min_inclusive"`
-		IsMaxInclusive bool  `yaml:"is_max_inclusive"`
-	}
 }
 
 type MigrationConfig struct {
@@ -82,8 +76,6 @@ func (c *MigrationConfig) UnmarshalYAML(value *yaml.Node) error {
 
 	c.MaxParallelWorkers = raw.MaxParallelWorkers
 	c.Defaults = raw.Defaults
-	c.SourceDbType = raw.SourceDbType
-	c.TargetDbType = raw.TargetDbType
 	c.Defaults.RowsPerPartition = int64(raw.Defaults.BatchSize * raw.Defaults.BatchesPerPartition)
 
 	for _, node := range raw.Jobs {

internal/app/custom_errors/extractor.error.go

@@ -103,8 +103,8 @@ func ExtractorErrorHandler(
 			if err.HasLastId {
 				newPartition.ParentId = err.Partition.Id
 				newPartition.Id = uuid.New()
-				newPartition.Range.Min = err.LastId
+				newPartition.LowerLimit = err.LastId
-				newPartition.Range.IsMinInclusive = false
+				newPartition.IsLowerLimitInclusive = false
 			}
 
 			requeueWithBackoff(ctx, delay, func() {

internal/app/db-wrapper/main.go

@@ -1,19 +0,0 @@
-package dbwrapper
-
-import "fmt"
-
-type Factory func() DbWrapper
-
-var drivers = make(map[string]Factory)
-
-func Register(name string, factory Factory) {
-	drivers[name] = factory
-}
-
-func New(driverType string) (DbWrapper, error) {
-	factory, ok := drivers[driverType]
-	if !ok {
-		return nil, fmt.Errorf("driver not yet supported: %s", driverType)
-	}
-	return factory(), nil
-}

internal/app/db-wrapper/mssql.go

@@ -1,176 +0,0 @@
-package dbwrapper
-
-import (
-	"context"
-	"database/sql"
-	"fmt"
-
-	mssql "github.com/microsoft/go-mssqldb"
-)
-
-func init() {
-	Register("sqlserver", func() DbWrapper {
-		return &mssqlDbWrapper{dialect: "sqlserver"}
-	})
-}
-
-type mssqlRowResult struct {
-	row *sql.Row
-}
-
-func (mr *mssqlRowResult) Scan(dest ...any) error {
-	return mr.row.Scan(dest...)
-}
-
-type mssqlRowsResult struct {
-	columns []string
-	rows    *sql.Rows
-}
-
-func (mr *mssqlRowsResult) Close() error {
-	return mr.rows.Close()
-}
-
-func (mr *mssqlRowsResult) Columns() ([]string, error) {
-	if mr.columns != nil {
-		return mr.columns, nil
-	}
-
-	return mr.rows.Columns()
-}
-
-func (mr *mssqlRowsResult) Err() error {
-	return mr.rows.Err()
-}
-
-func (mr *mssqlRowsResult) Next() bool {
-	return mr.rows.Next()
-}
-
-func (mr *mssqlRowsResult) Scan(dest ...any) error {
-	return mr.rows.Scan(dest...)
-}
-
-func (mr *mssqlRowsResult) Values() ([]any, error) {
-	columns, err := mr.Columns()
-	if err != nil {
-		return nil, err
-	}
-
-	rowValues := make([]any, len(columns))
-	scanArgs := make([]any, len(columns))
-	for i := range rowValues {
-		scanArgs[i] = &rowValues[i]
-	}
-
-	if err := mr.rows.Scan(scanArgs...); err != nil {
-		return nil, err
-	}
-
-	return rowValues, nil
-}
-
-type mssqlDbWrapper struct {
-	db      *sql.DB
-	dialect string
-}
-
-func (mw *mssqlDbWrapper) Connect(ctx context.Context, dbUrl string) error {
-	db, err := sql.Open("sqlserver", dbUrl)
-	if err != nil {
-		return err
-	}
-
-	if err := db.PingContext(ctx); err != nil {
-		if err := db.Close(); err != nil {
-			return err
-		}
-		return err
-	}
-
-	mw.db = db
-	return nil
-}
-
-func (mw *mssqlDbWrapper) Close() error {
-	return mw.db.Close()
-}
-
-func (mw *mssqlDbWrapper) Exec(ctx context.Context, query string, args ...any) (ExecResult, error) {
-	result, execErr := mw.db.ExecContext(ctx, query, args...)
-	if execErr != nil {
-		return ExecResult{}, execErr
-	}
-
-	affectedRows, err := result.RowsAffected()
-	if err != nil {
-		return ExecResult{}, err
-	}
-
-	return ExecResult{AffectedRows: affectedRows}, nil
-}
-
-func (mw *mssqlDbWrapper) GetDialect() string {
-	return mw.dialect
-}
-
-func (mw *mssqlDbWrapper) Query(ctx context.Context, query string, args ...any) (RowsResult, error) {
-	rows, err := mw.db.QueryContext(ctx, query, args...)
-	if err != nil {
-		return nil, err
-	}
-
-	return &mssqlRowsResult{columns: nil, rows: rows}, nil
-}
-
-func (mw *mssqlDbWrapper) QueryRow(ctx context.Context, query string, args ...any) RowResult {
-	row := mw.db.QueryRowContext(ctx, query, args...)
-	return &mssqlRowResult{row: row}
-}
-
-func (mw *mssqlDbWrapper) SaveMassive(ctx context.Context, schema string, table string, columnNames []string, rows [][]any) (int64, error) {
-	tx, err := mw.db.BeginTx(ctx, nil)
-	if err != nil {
-		return 0, err
-	}
-
-	fullTableName := fmt.Sprintf("[%s].[%s]", schema, table)
-
-	stmt, err := tx.PrepareContext(ctx, mssql.CopyIn(fullTableName, mssql.BulkOptions{}, columnNames...))
-	if err != nil {
-		tx.Rollback()
-		return 0, err
-	}
-
-	for _, row := range rows {
-		_, err = stmt.ExecContext(ctx, row...)
-		if err != nil {
-			stmt.Close()
-			tx.Rollback()
-			return 0, err
-		}
-	}
-
-	result, err := stmt.ExecContext(ctx)
-	if err != nil {
-		stmt.Close()
-		tx.Rollback()
-		return 0, err
-	}
-
-	if err := stmt.Close(); err != nil {
-		tx.Rollback()
-		return 0, err
-	}
-
-	if err := tx.Commit(); err != nil {
-		return 0, err
-	}
-
-	rowsAffected, raErr := result.RowsAffected()
-	if raErr != nil {
-		return 0, nil
-	}
-
-	return rowsAffected, nil
-}

internal/app/db-wrapper/postgres.go

@@ -1,128 +0,0 @@
-package dbwrapper
-
-import (
-	"context"
-	"errors"
-
-	"github.com/jackc/pgx/v5"
-	"github.com/jackc/pgx/v5/pgxpool"
-)
-
-func init() {
-	Register("postgres", func() DbWrapper {
-		return &postgresDbWrapper{dialect: "postgres"}
-	})
-}
-
-type postgresRowResult struct {
-	row pgx.Row
-}
-
-func (pr *postgresRowResult) Scan(dest ...any) error {
-	return pr.row.Scan(dest...)
-}
-
-type postgresRowsResult struct {
-	columns []string
-	rows    pgx.Rows
-}
-
-func (pr *postgresRowsResult) Close() error {
-	pr.rows.Close()
-	return nil
-}
-
-func (pr *postgresRowsResult) Columns() ([]string, error) {
-	if pr.columns != nil {
-		return pr.columns, nil
-	}
-
-	rawColumns := pr.rows.FieldDescriptions()
-	if rawColumns == nil {
-		return nil, errors.New("error retrieving columns")
-	}
-
-	columns := make([]string, 0, len(rawColumns))
-	for _, rc := range rawColumns {
-		columns = append(columns, rc.Name)
-	}
-
-	return columns, nil
-}
-
-func (pr *postgresRowsResult) Err() error {
-	return pr.rows.Err()
-}
-
-func (pr *postgresRowsResult) Next() bool {
-	return pr.rows.Next()
-}
-
-func (pr *postgresRowsResult) Scan(dest ...any) error {
-	return pr.rows.Scan(dest...)
-}
-
-func (pr *postgresRowsResult) Values() ([]any, error) {
-	return pr.rows.Values()
-}
-
-type postgresDbWrapper struct {
-	db      *pgxpool.Pool
-	dialect string
-}
-
-func (pw *postgresDbWrapper) Connect(ctx context.Context, dbUrl string) error {
-	pool, err := pgxpool.New(ctx, dbUrl)
-	if err != nil {
-		return err
-	}
-
-	if err := pool.Ping(ctx); err != nil {
-		pool.Close()
-		return err
-	}
-
-	pw.db = pool
-	return nil
-}
-
-func (pw *postgresDbWrapper) Close() error {
-	pw.db.Close()
-	return nil
-}
-
-func (pw *postgresDbWrapper) Exec(ctx context.Context, query string, args ...any) (ExecResult, error) {
-	result, err := pw.db.Exec(ctx, query, args...)
-	if err != nil {
-		return ExecResult{}, err
-	}
-
-	return ExecResult{AffectedRows: result.RowsAffected()}, nil
-}
-
-func (pw *postgresDbWrapper) GetDialect() string {
-	return pw.dialect
-}
-
-func (pw *postgresDbWrapper) Query(ctx context.Context, query string, args ...any) (RowsResult, error) {
-	rows, err := pw.db.Query(ctx, query, args...)
-	if err != nil {
-		return nil, err
-	}
-
-	return &postgresRowsResult{columns: nil, rows: rows}, nil
-}
-
-func (pw *postgresDbWrapper) QueryRow(ctx context.Context, query string, args ...any) RowResult {
-	row := pw.db.QueryRow(ctx, query, args...)
-	return &postgresRowResult{row: row}
-}
-
-func (pw *postgresDbWrapper) SaveMassive(ctx context.Context, schema string, table string, columnNames []string, rows [][]any) (int64, error) {
-	affectedRows, err := pw.db.CopyFrom(ctx, pgx.Identifier{schema, table}, columnNames, pgx.CopyFromRows(rows))
-	if err != nil {
-		return 0, err
-	}
-
-	return affectedRows, nil
-}

internal/app/db-wrapper/types.go

@@ -1,35 +0,0 @@
-package dbwrapper
-
-import (
-	"context"
-	"errors"
-)
-
-var MethodNotSupported error = errors.New("Method not supported by driver... yet :P")
-
-type ExecResult struct {
-	AffectedRows int64
-}
-
-type RowsResult interface {
-	Close() error
-	Columns() ([]string, error)
-	Err() error
-	Next() bool
-	Scan(dest ...any) error
-	Values() ([]any, error)
-}
-
-type RowResult interface {
-	Scan(dest ...any) error
-}
-
-type DbWrapper interface {
-	Close() error
-	Connect(ctx context.Context, dbUrl string) error
-	Exec(ctx context.Context, query string, args ...any) (ExecResult, error)
-	GetDialect() string
-	Query(ctx context.Context, query string, args ...any) (RowsResult, error)
-	QueryRow(ctx context.Context, query string, args ...any) RowResult
-	SaveMassive(ctx context.Context, schema string, table string, columnNames []string, rows [][]any) (int64, error)
-}

internal/app/db/mssql.go

@@ -0,0 +1,30 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+)
+
+type MssqlDbWrapper struct {
+	db *sql.DB
+}
+
+func NewMssqlDbWrapper(db *sql.DB) DbWrapper {
+	return &MssqlDbWrapper{db: db}
+}
+
+func (wrapper *MssqlDbWrapper) Exec(ctx context.Context, query string, args ...any) (DbWrapperResult, error) {
+	result, execErr := wrapper.db.ExecContext(ctx, query, args...)
+	if execErr != nil {
+		return DbWrapperResult{}, execErr
+	}
+
+	affectedRows, err := result.RowsAffected()
+	if err != nil {
+		return DbWrapperResult{}, err
+	}
+
+	return DbWrapperResult{
+		AffectedRows: affectedRows,
+	}, nil
+}

internal/app/db/postgres.go

@@ -0,0 +1,47 @@
+package db
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+func Connect(ctx context.Context, dbURL string) (*pgxpool.Pool, error) {
+	pool, err := pgxpool.New(ctx, dbURL)
+	if err != nil {
+		return nil, fmt.Errorf("unable to connect to database: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("unable to ping database: %w", err)
+	}
+
+	return pool, nil
+}
+
+func Close(pool *pgxpool.Pool) {
+	if pool != nil {
+		pool.Close()
+	}
+}
+
+type PostgresDbWrapper struct {
+	db *pgxpool.Pool
+}
+
+func NewPostgresDbWrapper(db *pgxpool.Pool) DbWrapper {
+	return &PostgresDbWrapper{db: db}
+}
+
+func (wrapper *PostgresDbWrapper) Exec(ctx context.Context, query string, args ...any) (DbWrapperResult, error) {
+	result, err := wrapper.db.Exec(ctx, query, args...)
+	if err != nil {
+		return DbWrapperResult{}, err
+	}
+
+	return DbWrapperResult{
+		AffectedRows: result.RowsAffected(),
+	}, nil
+}

internal/app/db/types.go

@@ -0,0 +1,11 @@
+package db
+
+import "context"
+
+type DbWrapperResult struct {
+	AffectedRows int64
+}
+
+type DbWrapper interface {
+	Exec(ctx context.Context, query string, args ...any) (DbWrapperResult, error)
+}

internal/app/etl/extractors/mssql.go

@@ -13,17 +13,16 @@ import (
 	"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 {
-	db dbwrapper.DbWrapper
+	db *sql.DB
 }
 
-func NewMssqlExtractor(db dbwrapper.DbWrapper) etl.Extractor {
+func NewMssqlExtractor(db *sql.DB) etl.Extractor {
 	return &MssqlExtractor{db: db}
 }
 
@@ -43,9 +42,9 @@ 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(", ")
@@ -108,18 +107,18 @@ func (mssqlEx *MssqlExtractor) ProcessPartition(
 	indexPrimaryKey int,
 	chBatchesOut chan<- models.Batch,
 ) (int, error) {
-	query := buildExtractQueryMssql(tableInfo, columns, partition.HasRange, partition.Range.IsMinInclusive)
+	query := buildExtractQueryMssql(tableInfo, columns, partition.ShouldUseRange, partition.IsLowerLimitInclusive)
 
 	var queryArgs []any
-	if partition.HasRange {
+	if partition.ShouldUseRange {
 		queryArgs = append(queryArgs,
-			sql.Named("min", partition.Range.Min),
+			sql.Named("min", partition.LowerLimit),
-			sql.Named("max", partition.Range.Max),
+			sql.Named("max", partition.UpperLimit),
 		)
 	}
 
 	rowsRead := 0
-	rows, err := mssqlEx.db.Query(ctx, query, queryArgs...)
+	rows, err := mssqlEx.db.QueryContext(ctx, query, queryArgs...)
 	if err != nil {
 		return rowsRead, &custom_errors.ExtractorError{Partition: partition, HasLastId: false, Msg: err.Error()}
 	}

internal/app/etl/extractors/postgres.go

@@ -9,18 +9,18 @@ import (
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"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"
+	"github.com/jackc/pgx/v5/pgxpool"
 )
 
 type PostgresExtractor struct {
-	db dbwrapper.DbWrapper
+	db *pgxpool.Pool
 }
 
-func NewPostgresExtractor(db dbwrapper.DbWrapper) etl.Extractor {
+func NewPostgresExtractor(pool *pgxpool.Pool) etl.Extractor {
-	return &PostgresExtractor{db: db}
+	return &PostgresExtractor{db: pool}
 }
 
 func buildExtractQueryPostgres(sourceDbInfo config.SourceTableInfo, columns []models.ColumnType) string {
@@ -62,7 +62,7 @@ func (postgresEx *PostgresExtractor) ProcessPartition(
 ) (int, error) {
 	query := buildExtractQueryPostgres(tableInfo, columns)
 
-	if partition.HasRange {
+	if partition.ShouldUseRange {
 		return 0, errors.New("Batch config not yet supported")
 	}
 

internal/app/etl/extractors/types.go

@@ -0,0 +1 @@
+package extractors

internal/app/etl/loaders/postgres.go

@@ -9,32 +9,43 @@ import (
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"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/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgconn"
+	"github.com/jackc/pgx/v5/pgxpool"
 )
 
-type GenericLoader struct {
+type PostgresLoader struct {
-	db dbwrapper.DbWrapper
+	db *pgxpool.Pool
 }
 
-func NewGenericLoader(db dbwrapper.DbWrapper) etl.Loader {
+func NewPostgresLoader(pool *pgxpool.Pool) etl.Loader {
-	return &GenericLoader{db: db}
+	return &PostgresLoader{db: pool}
 }
 
-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(
+	tableId := pgx.Identifier{tableInfo.Schema, tableInfo.Table}
+	_, err := postgresLd.db.CopyFrom(
 		ctx,
-		tableInfo.Schema,
+		tableId,
-		tableInfo.Table,
 		colNames,
-		batch.Rows,
+		pgx.CopyFromRows(batch.Rows),
 	)
 
 	if err != nil {
@@ -43,7 +54,7 @@ func (gl *GenericLoader) ProcessBatch(
 			if pgErr.Code == "23505" {
 				return 0, &custom_errors.JobError{
 					ShouldCancelJob: true,
-					Msg:             fmt.Sprintf("Fatal error in table %s.%s", tableInfo.Schema, tableInfo.Table),
+					Msg:             fmt.Sprintf("Fatal error in table %s", tableId.Sanitize()),
 					Prev:            err,
 				}
 			}
@@ -55,7 +66,7 @@ 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 +93,7 @@ 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/main.go

@@ -23,9 +23,9 @@ func PartitionRangeGenerator(
 
 	if rowsCount <= rowsPerPartition {
 		return []models.Partition{{
-			Id:           uuid.New(),
+			Id:             uuid.New(),
-			HasRange:     false,
+			ShouldUseRange: false,
-			RetryCounter: 0,
+			RetryCounter:   0,
 		}}, nil
 
 	}

internal/app/etl/table_analyzers/mssql.go

@@ -8,17 +8,16 @@ import (
 	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-	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 MssqlTableAnalyzer struct {
-	db dbwrapper.DbWrapper
+	db *sql.DB
 }
 
-func NewMssqlTableAnalyzer(db dbwrapper.DbWrapper) etl.TableAnalyzer {
+func NewMssqlTableAnalyzer(db *sql.DB) etl.TableAnalyzer {
 	return &MssqlTableAnalyzer{db: db}
 }
 
@@ -36,11 +35,9 @@ JOIN sys.types t ON c.user_type_id = t.user_type_id
 LEFT JOIN sys.types bt ON t.is_user_defined = 1 AND bt.user_type_id = t.system_type_id
 JOIN sys.tables st ON c.object_id = st.object_id
 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 '$%'))
+WHERE s.name = @schema AND st.name = @table AND c.name NOT LIKE 'graph_id%'
 ORDER BY c.column_id;`
 
-// AND c.name NOT LIKE '$%'
-
 type rawColumnMssql struct {
 	name       string
 	userType   string
@@ -145,7 +142,7 @@ func (ta *MssqlTableAnalyzer) QueryColumnTypes(
 	localCtx, cancel := context.WithTimeout(ctx, 20*time.Second)
 	defer cancel()
 
-	rows, err := ta.db.Query(localCtx, mssqlColumnMetadataQuery, sql.Named("schema", tableInfo.Schema), sql.Named("table", tableInfo.Table))
+	rows, err := ta.db.QueryContext(localCtx, mssqlColumnMetadataQuery, sql.Named("schema", tableInfo.Schema), sql.Named("table", tableInfo.Table))
 	if err != nil {
 		return nil, err
 	}
@@ -186,11 +183,11 @@ JOIN sys.partitions p ON t.object_id = p.object_id
 WHERE s.name = @schema AND t.name = @table AND p.index_id IN (0, 1)
 GROUP BY t.name`
 
-	ctxTimeout, cancel := context.WithTimeout(ctx, 1*time.Minute)
+	ctxTimeout, cancel := context.WithTimeout(ctx, time.Second*20)
 	defer cancel()
 
 	var rowsCount int64
-	err := ta.db.QueryRow(ctxTimeout, query, sql.Named("schema", tableInfo.Schema), sql.Named("table", tableInfo.Table)).Scan(&rowsCount)
+	err := ta.db.QueryRowContext(ctxTimeout, query, sql.Named("schema", tableInfo.Schema), sql.Named("table", tableInfo.Table)).Scan(&rowsCount)
 	if err != nil {
 		return 0, err
 	}
@@ -218,10 +215,10 @@ ORDER BY batch_id`,
 		tableInfo.Schema,
 		tableInfo.Table)
 
-	ctxTimeout, cancel := context.WithTimeout(ctx, 1*time.Minute)
+	ctxTimeout, cancel := context.WithTimeout(ctx, time.Second*20)
 	defer cancel()
 
-	rows, err := ta.db.Query(ctxTimeout, query, sql.Named("maxPartitions", maxPartitions))
+	rows, err := ta.db.QueryContext(ctxTimeout, query, sql.Named("maxPartitions", maxPartitions))
 	if err != nil {
 		return nil, err
 	}
@@ -231,15 +228,13 @@ ORDER BY batch_id`,
 
 	for rows.Next() {
 		partition := models.Partition{
-			Id:           uuid.New(),
+			Id:                    uuid.New(),
-			HasRange:     true,
+			ShouldUseRange:        true,
-			RetryCounter: 0,
+			RetryCounter:          0,
-			Range: models.PartitionRange{
+			IsLowerLimitInclusive: true,
-				IsMinInclusive: true,
-			},
 		}
 
-		if err := rows.Scan(&partition.Range.Min, &partition.Range.Max); err != nil {
+		if err := rows.Scan(&partition.LowerLimit, &partition.UpperLimit); err != nil {
 			return nil, err
 		}
 

internal/app/etl/table_analyzers/postgres.go

@@ -6,16 +6,16 @@ import (
 	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
-	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/jackc/pgx/v5/pgxpool"
 )
 
 type PostgresTableAnalyzer struct {
-	db dbwrapper.DbWrapper
+	db *pgxpool.Pool
 }
 
-func NewPostgresTableAnalyzer(db dbwrapper.DbWrapper) etl.TableAnalyzer {
+func NewPostgresTableAnalyzer(db *pgxpool.Pool) etl.TableAnalyzer {
 	return &PostgresTableAnalyzer{db: db}
 }
 
@@ -125,7 +125,7 @@ func (ta *PostgresTableAnalyzer) QueryColumnTypes(
 	ctx context.Context,
 	tableInfo config.TableInfo,
 ) ([]models.ColumnType, error) {
-	localCtx, cancel := context.WithTimeout(ctx, 1*time.Minute)
+	localCtx, cancel := context.WithTimeout(ctx, 20*time.Second)
 	defer cancel()
 
 	rows, err := ta.db.Query(localCtx, postgresColumnMetadataQuery, tableInfo.Schema, tableInfo.Table)

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/models/main.go

@@ -1,10 +1,6 @@
 package models
 
-import (
+import "github.com/google/uuid"
-	"time"
-
-	"github.com/google/uuid"
-)
 
 type UnknownRowValues = []any
 
@@ -15,27 +11,12 @@ type Batch struct {
 	RetryCounter int
 }
 
-type PartitionRange struct {
-	Min            int64
-	Max            int64
-	IsMinInclusive bool
-	IsMaxInclusive bool
-}
-
 type Partition struct {
-	Id           uuid.UUID
+	Id                    uuid.UUID
-	ParentId     uuid.UUID
+	ParentId              uuid.UUID
-	Range        PartitionRange
+	LowerLimit            int64
-	HasRange     bool
+	UpperLimit            int64
-	RetryCounter int
+	IsLowerLimitInclusive bool
-}
+	ShouldUseRange        bool
-
+	RetryCounter          int
-type JobResult struct {
-	JobName    string
-	StartTime  time.Time
-	Duration   time.Duration
-	RowsRead   int64
-	RowsLoaded int64
-	RowsFailed int64
-	Error      error
 }

scripts/backoff-test/main.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"github.com/cenkalti/backoff/v5"
+)
+
+func ExampleRetry() {
+	// Define an operation function that returns a value and an error.
+	// The value can be any type.
+	// We'll pass this operation to Retry function.
+	operation := func() (string, error) {
+		// An example request that may fail.
+		resp, err := http.Get("http://httpbin.org/get")
+		if err != nil {
+			return "", err
+		}
+		defer resp.Body.Close()
+
+		// If we are being rate limited, return a RetryAfter to specify how long to wait.
+		// This will also reset the backoff policy.
+		if resp.StatusCode == 429 {
+			seconds, err := strconv.ParseInt(resp.Header.Get("Retry-After"), 10, 64)
+			if err == nil {
+				return "", backoff.RetryAfter(int(seconds))
+			}
+		}
+
+		// In case of non-retriable error, return Permanent error to stop retrying.
+		// For this HTTP example, client errors are non-retriable.
+		if resp.StatusCode >= 400 && resp.StatusCode < 500 {
+			return "", backoff.Permanent(errors.New("bad request"))
+		}
+
+		// Return successful response.
+		return "hello", nil
+	}
+
+	result, err := backoff.Retry(context.TODO(), operation, backoff.WithBackOff(backoff.NewExponentialBackOff()))
+	if err != nil {
+		fmt.Println("Error:", err)
+		return
+	}
+
+	// Operation is successful after retries.
+
+	fmt.Println(result)
+	// Output: hello
+}
+
+func main() {
+	ExampleRetry()
+}

scripts/pg-info-test/main.go

@@ -8,32 +8,13 @@ import (
 	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/db"
 	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgtype"
 	"github.com/jackc/pgx/v5/pgxpool"
 	log "github.com/sirupsen/logrus"
 )
 
-func Connect(ctx context.Context, dbURL string) (*pgxpool.Pool, error) {
-	pool, err := pgxpool.New(ctx, dbURL)
-	if err != nil {
-		return nil, fmt.Errorf("unable to connect to database: %w", err)
-	}
-
-	if err := pool.Ping(ctx); err != nil {
-		pool.Close()
-		return nil, fmt.Errorf("unable to ping database: %w", err)
-	}
-
-	return pool, nil
-}
-
-func Close(pool *pgxpool.Pool) {
-	if pool != nil {
-		pool.Close()
-	}
-}
-
 func main() {
 	log.SetFormatter(&log.TextFormatter{
 		FullTimestamp:   true,
@@ -46,8 +27,8 @@ func main() {
 	ctxSource, cancel := context.WithTimeout(context.Background(), 20*time.Second)
 	defer cancel()
 
-	sourcePool, err := Connect(ctxSource, config.App.SourceDbUrl)
+	sourcePool, err := db.Connect(ctxSource, config.App.SourceDbUrl)
-	defer Close(sourcePool)
+	defer db.Close(sourcePool)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -56,8 +37,8 @@ func main() {
 	ctxTarget, cancel := context.WithTimeout(context.Background(), 20*time.Second)
 	defer cancel()
 
-	targetPool, err := Connect(ctxTarget, config.App.TargetDbUrl)
+	targetPool, err := db.Connect(ctxTarget, config.App.TargetDbUrl)
-	defer Close(targetPool)
+	defer db.Close(targetPool)
 	if err != nil {
 		log.Fatal(err)
 	}