feat: add context-aware Go migrations (#534)

create.go

@@ -99,20 +99,21 @@ SELECT 'down SQL query';
 var goSQLMigrationTemplate = template.Must(template.New("goose.go-migration").Parse(`package migrations
 
 import (
+	"context"
 	"database/sql"
 	"github.com/pressly/goose/v3"
 )
 
 func init() {
-	goose.AddMigration(up{{.CamelName}}, down{{.CamelName}})
+	goose.AddMigrationContext(up{{.CamelName}}, down{{.CamelName}})
 }
 
-func up{{.CamelName}}(tx *sql.Tx) error {
+func up{{.CamelName}}(ctx context.Context, tx *sql.Tx) error {
 	// This code is executed when the migration is applied.
 	return nil
 }
 
-func down{{.CamelName}}(tx *sql.Tx) error {
+func down{{.CamelName}}(ctx context.Context, tx *sql.Tx) error {
 	// This code is executed when the migration is rolled back.
 	return nil
 }

migrate.go

@@ -130,30 +130,58 @@ func (ms Migrations) String() string {
 // GoMigration is a Go migration func that is run within a transaction.
 type GoMigration func(tx *sql.Tx) error
 
+// GoMigrationContext is a Go migration func that is run within a transaction and receives a context.
+type GoMigrationContext func(ctx context.Context, tx *sql.Tx) error
+
 // GoMigrationNoTx is a Go migration func that is run outside a transaction.
 type GoMigrationNoTx func(db *sql.DB) error
 
+// GoMigrationNoTxContext is a Go migration func that is run outside a transaction and receives a context.
+type GoMigrationNoTxContext func(ctx context.Context, db *sql.DB) error
+
 // AddMigration adds Go migrations.
 func AddMigration(up, down GoMigration) {
 	_, filename, _, _ := runtime.Caller(1)
-	AddNamedMigration(filename, up, down)
+	// intentionally don't call to AddMigrationContext so each of these functions can calculate the filename correctly
+	AddNamedMigrationContext(filename, withContext(up), withContext(down))
+}
+
+// AddMigrationContext adds Go migrations.
+func AddMigrationContext(up, down GoMigrationContext) {
+	_, filename, _, _ := runtime.Caller(1)
+	AddNamedMigrationContext(filename, up, down)
 }
 
 // AddNamedMigration adds named Go migrations.
 func AddNamedMigration(filename string, up, down GoMigration) {
+	AddNamedMigrationContext(filename, withContext(up), withContext(down))
+}
+
+// AddNamedMigrationContext adds named Go migrations.
+func AddNamedMigrationContext(filename string, up, down GoMigrationContext) {
 	if err := register(filename, true, up, down, nil, nil); err != nil {
 		panic(err)
 	}
 }
 
 // AddMigrationNoTx adds Go migrations that will be run outside transaction.
 func AddMigrationNoTx(up, down GoMigrationNoTx) {
-	_, filename, _, _ := runtime.Caller(1)
-	AddNamedMigrationNoTx(filename, up, down)
+	AddMigrationNoTxContext(withContext(up), withContext(down))
+}
+
+// AddMigrationNoTxContext adds Go migrations that will be run outside transaction.
+func AddMigrationNoTxContext(up, down GoMigrationNoTxContext) {
+	_, filename, _, _ := runtime.Caller(2)
+	AddNamedMigrationNoTxContext(filename, up, down)
 }
 
 // AddNamedMigrationNoTx adds named Go migrations that will be run outside transaction.
 func AddNamedMigrationNoTx(filename string, up, down GoMigrationNoTx) {
+	AddNamedMigrationNoTxContext(filename, withContext(up), withContext(down))
+}
+
+// AddNamedMigrationNoTxContext adds named Go migrations that will be run outside transaction.
+func AddNamedMigrationNoTxContext(filename string, up, down GoMigrationNoTxContext) {
 	if err := register(filename, false, nil, nil, up, down); err != nil {
 		panic(err)
 	}
@@ -162,8 +190,8 @@ func AddNamedMigrationNoTx(filename string, up, down GoMigrationNoTx) {
 func register(
 	filename string,
 	useTx bool,
-	up, down GoMigration,
-	upNoTx, downNoTx GoMigrationNoTx,
+	up, down GoMigrationContext,
+	upNoTx, downNoTx GoMigrationNoTxContext,
 ) error {
 	// Sanity check caller did not mix tx and non-tx based functions.
 	if (up != nil || down != nil) && (upNoTx != nil || downNoTx != nil) {
@@ -179,16 +207,23 @@ func register(
 	}
 	// Add to global as a registered migration.
 	registeredGoMigrations[v] = &Migration{
-		Version:    v,
-		Next:       -1,
-		Previous:   -1,
-		Registered: true,
-		Source:     filename,
-		UseTx:      useTx,
-		UpFn:       up,
-		DownFn:     down,
-		UpFnNoTx:   upNoTx,
-		DownFnNoTx: downNoTx,
+		Version:           v,
+		Next:              -1,
+		Previous:          -1,
+		Registered:        true,
+		Source:            filename,
+		UseTx:             useTx,
+		UpFnContext:       up,
+		DownFnContext:     down,
+		UpFnNoTxContext:   upNoTx,
+		DownFnNoTxContext: downNoTx,
+		// These are deprecated and will be removed in the future.
+		// For backwards compatibility we still save the non-context versions in the struct in case someone is using them.
+		// Goose does not use these internally anymore and instead uses the context versions.
+		UpFn:       withoutContext(up),
+		DownFn:     withoutContext(down),
+		UpFnNoTx:   withoutContext(upNoTx),
+		DownFnNoTx: withoutContext(downNoTx),
 	}
 	return nil
 }
@@ -378,3 +413,26 @@ func GetDBVersionContext(ctx context.Context, db *sql.DB) (int64, error) {
 
 	return version, nil
 }
+
+// withContext changes the signature of a function that receives one argument to receive a context and the argument.
+func withContext[T any](fn func(T) error) func(context.Context, T) error {
+	if fn == nil {
+		return nil
+	}
+
+	return func(ctx context.Context, t T) error {
+		return fn(t)
+	}
+}
+
+// withoutContext changes the signature of a function that receives a context and one argument to receive only the argument.
+// When called the passed context is always context.Background().
+func withoutContext[T any](fn func(context.Context, T) error) func(T) error {
+	if fn == nil {
+		return nil
+	}
+
+	return func(t T) error {
+		return fn(context.Background(), t)
+	}
+}

migration.go

@@ -22,15 +22,23 @@ type MigrationRecord struct {
 
 // Migration struct.
 type Migration struct {
-	Version              int64
-	Next                 int64  // next version, or -1 if none
-	Previous             int64  // previous version, -1 if none
-	Source               string // path to .sql script or go file
-	Registered           bool
-	UseTx                bool
+	Version    int64
+	Next       int64  // next version, or -1 if none
+	Previous   int64  // previous version, -1 if none
+	Source     string // path to .sql script or go file
+	Registered bool
+	UseTx      bool
+
+	// These are deprecated and will be removed in the future.
+	// For backwards compatibility we still save the non-context versions in the struct in case someone is using them.
+	// Goose does not use these internally anymore and instead uses the context versions.
 	UpFn, DownFn         GoMigration
 	UpFnNoTx, DownFnNoTx GoMigrationNoTx
-	noVersioning         bool
+
+	// New functions with context
+	UpFnContext, DownFnContext         GoMigrationContext
+	UpFnNoTxContext, DownFnNoTxContext GoMigrationNoTxContext
+	noVersioning                       bool
 }
 
 func (m *Migration) String() string {
@@ -99,9 +107,9 @@ func (m *Migration) run(ctx context.Context, db *sql.DB, direction bool) error {
 		var empty bool
 		if m.UseTx {
 			// Run go-based migration inside a tx.
-			fn := m.DownFn
+			fn := m.DownFnContext
 			if direction {
-				fn = m.UpFn
+				fn = m.UpFnContext
 			}
 			empty = (fn == nil)
 			if err := runGoMigration(
@@ -116,9 +124,9 @@ func (m *Migration) run(ctx context.Context, db *sql.DB, direction bool) error {
 			}
 		} else {
 			// Run go-based migration outside a tx.
-			fn := m.DownFnNoTx
+			fn := m.DownFnNoTxContext
 			if direction {
-				fn = m.UpFnNoTx
+				fn = m.UpFnNoTxContext
 			}
 			empty = (fn == nil)
 			if err := runGoMigrationNoTx(
@@ -145,14 +153,14 @@ func (m *Migration) run(ctx context.Context, db *sql.DB, direction bool) error {
 func runGoMigrationNoTx(
 	ctx context.Context,
 	db *sql.DB,
-	fn GoMigrationNoTx,
+	fn GoMigrationNoTxContext,
 	version int64,
 	direction bool,
 	recordVersion bool,
 ) error {
 	if fn != nil {
 		// Run go migration function.
-		if err := fn(db); err != nil {
+		if err := fn(ctx, db); err != nil {
 			return fmt.Errorf("failed to run go migration: %w", err)
 		}
 	}
@@ -165,7 +173,7 @@ func runGoMigrationNoTx(
 func runGoMigration(
 	ctx context.Context,
 	db *sql.DB,
-	fn GoMigration,
+	fn GoMigrationContext,
 	version int64,
 	direction bool,
 	recordVersion bool,
@@ -179,7 +187,7 @@ func runGoMigration(
 	}
 	if fn != nil {
 		// Run go migration function.
-		if err := fn(tx); err != nil {
+		if err := fn(ctx, tx); err != nil {
 			_ = tx.Rollback()
 			return fmt.Errorf("failed to run go migration: %w", err)
 		}