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driver.go
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driver.go
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package migration
import (
"context"
"database/sql"
"fmt"
"reflect"
"strings"
)
// A driver handles database vendor-specific operations.
type driver interface {
SupportsTransactionalDDL() bool
PackageNames() []string
CreateMigrationsTable(ctx context.Context, db *sql.DB, tblname string) error
InsertVersion(ctx context.Context, tx *sql.Tx, tblname string, ver *Version) error
DeleteVersion(ctx context.Context, tx *sql.Tx, tblname string, id VersionID) error
ListVersions(ctx context.Context, tx *sql.Tx, tblname string) ([]*Version, error)
SetVersionFailed(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, failed bool) error
SetVersionLocked(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, locked bool) error
}
var drivers = []driver{
&postgres{},
&sqlite{},
&mysql{},
}
func findDriver(db *sql.DB) (driver, error) {
driverType := reflect.TypeOf(db.Driver()).String()
driverType = strings.TrimLeft(driverType, "*")
split := strings.SplitN(driverType, ".", 2)
pkgname := split[0]
for _, drv := range drivers {
for _, p := range drv.PackageNames() {
if p == pkgname {
return drv, nil
}
}
}
return nil, fmt.Errorf("cannot find migration driver for %s", pkgname)
}
type postgres struct{}
func (w *postgres) PackageNames() []string {
return []string{"pq"}
}
func (w *postgres) SupportsTransactionalDDL() bool {
return true
}
func (w *postgres) CreateMigrationsTable(ctx context.Context, db *sql.DB, tblname string) error {
format := `create table if not exists %s` +
`(id bigint primary key` +
`,applied_at timestamptz not null` +
`,failed boolean not null default 'false'` +
`,locked boolean not null default 'false'` +
`);`
return commonCreateMigrationsTable(ctx, db, tblname, format)
}
func (w *postgres) InsertVersion(ctx context.Context, tx *sql.Tx, tblname string, ver *Version) error {
format := `insert into %s(id,applied_at,failed,locked) values($1,$2,$3,$4);`
return commonInsertVersion(ctx, tx, tblname, ver, format)
}
func (w *postgres) DeleteVersion(ctx context.Context, tx *sql.Tx, tblname string, id VersionID) error {
format := `delete from %s where id = $1;`
return commonDeleteVersion(ctx, tx, tblname, id, format)
}
func (w *postgres) ListVersions(ctx context.Context, tx *sql.Tx, tblname string) ([]*Version, error) {
return commonListVersions(ctx, tx, tblname)
}
func (w *postgres) SetVersionFailed(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, failed bool) error {
format := `update %s set failed = $1 where id = $2`
return commonSetBool(ctx, tx, tblname, id, failed, format)
}
func (w *postgres) SetVersionLocked(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, locked bool) error {
format := `update %s set locked = $1 where id = $2`
return commonSetBool(ctx, tx, tblname, id, locked, format)
}
func wrapf(err error, format string, args ...interface{}) error {
msg := fmt.Sprintf(format, args...)
return wrappedError{Err: err, Message: msg}
}
type wrappedError struct {
Message string
Err error
}
func (e wrappedError) Error() string {
return fmt.Sprintf("%s: %v", e.Message, e.Err)
}
func (e wrappedError) Unwrap() error {
return e.Err
}
func (e wrappedError) Cause() error {
return e.Err
}
type sqlite struct{}
func (w *sqlite) PackageNames() []string {
return []string{"sqlite3"}
}
func (w *sqlite) SupportsTransactionalDDL() bool {
return true
}
func (w *sqlite) CreateMigrationsTable(ctx context.Context, db *sql.DB, tblname string) error {
format := `create table if not exists %s` +
`(id integer primary key` +
`,applied_at text not null` +
`,failed integer not null` +
`,locked integer not null` +
`);`
return commonCreateMigrationsTable(ctx, db, tblname, format)
}
func (w *sqlite) InsertVersion(ctx context.Context, tx *sql.Tx, tblname string, ver *Version) error {
format := `insert into %s(id,applied_at,failed,locked) values(?,?,?,?);`
return commonInsertVersion(ctx, tx, tblname, ver, format)
}
func (w *sqlite) DeleteVersion(ctx context.Context, tx *sql.Tx, tblname string, id VersionID) error {
format := `delete from %s where id = ?;`
return commonDeleteVersion(ctx, tx, tblname, id, format)
}
func (w *sqlite) ListVersions(ctx context.Context, tx *sql.Tx, tblname string) ([]*Version, error) {
return commonListVersions(ctx, tx, tblname)
}
func (w *sqlite) SetVersionFailed(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, failed bool) error {
format := `update %s set failed = ? where id = ?`
return commonSetBool(ctx, tx, tblname, id, failed, format)
}
func (w *sqlite) SetVersionLocked(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, locked bool) error {
format := `update %s set locked = ? where id = ?`
return commonSetBool(ctx, tx, tblname, id, locked, format)
}
type mysql struct{}
func (w *mysql) PackageNames() []string {
return []string{"mysql"}
}
func (w *mysql) SupportsTransactionalDDL() bool {
return false
}
func (w *mysql) CreateMigrationsTable(ctx context.Context, db *sql.DB, tblname string) error {
format := `create table if not exists %s` +
`(id integer primary key` +
`,applied_at datetime not null` +
`,failed integer not null` +
`,locked integer not null` +
`);`
return commonCreateMigrationsTable(ctx, db, tblname, format)
}
func (w *mysql) InsertVersion(ctx context.Context, tx *sql.Tx, tblname string, ver *Version) error {
format := `insert into %s(id,applied_at,failed,locked) values(?,?,?,?);`
return commonInsertVersion(ctx, tx, tblname, ver, format)
}
func (w *mysql) DeleteVersion(ctx context.Context, tx *sql.Tx, tblname string, id VersionID) error {
format := `delete from %s where id = ?;`
return commonDeleteVersion(ctx, tx, tblname, id, format)
}
func (w *mysql) ListVersions(ctx context.Context, tx *sql.Tx, tblname string) ([]*Version, error) {
return commonListVersions(ctx, tx, tblname)
}
func (w *mysql) SetVersionFailed(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, failed bool) error {
format := `update %s set failed = ? where id = ?`
return commonSetBool(ctx, tx, tblname, id, failed, format)
}
func (w *mysql) SetVersionLocked(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, locked bool) error {
format := `update %s set locked = ? where id = ?`
return commonSetBool(ctx, tx, tblname, id, locked, format)
}
func commonCreateMigrationsTable(ctx context.Context, db *sql.DB, tblname string, format string) error {
query := fmt.Sprintf(format, tblname)
_, err := db.ExecContext(ctx, query)
if err != nil {
return wrapf(err, "cannot create table %s", tblname)
}
return nil
}
func commonInsertVersion(ctx context.Context, tx *sql.Tx, tblname string, ver *Version, format string) error {
query := fmt.Sprintf(format, tblname)
_, err := tx.ExecContext(ctx, query, ver.ID, *ver.AppliedAt, ver.Failed, ver.Locked)
if err != nil {
return wrapf(err, "cannot insert migration version %d", ver.ID)
}
return nil
}
func commonDeleteVersion(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, format string) error {
query := fmt.Sprintf(format, tblname)
_, err := tx.ExecContext(ctx, query, id)
if err != nil {
return wrapf(err, "cannot delete migration version %d", id)
}
return nil
}
func commonSetBool(ctx context.Context, tx *sql.Tx, tblname string, id VersionID, boolval bool, format string) error {
query := fmt.Sprintf(format, tblname)
_, err := tx.ExecContext(ctx, query, boolval, id)
if err != nil {
return wrapf(err, "cannot update migration version %d", id)
}
return nil
}
func commonListVersions(ctx context.Context, tx *sql.Tx, tblname string) ([]*Version, error) {
var versions []*Version
format := `select id,applied_at,failed,locked from %s order by id`
query := fmt.Sprintf(format, tblname)
rows, err := tx.QueryContext(ctx, query)
if err != nil {
return nil, wrapf(err, "cannot query versions")
}
for rows.Next() {
var (
ver Version
appliedAt timeVal
)
if err = rows.Scan(&ver.ID, &appliedAt, &ver.Failed, &ver.Locked); err != nil {
return nil, wrapf(err, "cannot scan version")
}
ver.AppliedAt = &appliedAt.Time
versions = append(versions, &ver)
}
if err = rows.Err(); err != nil {
return nil, wrapf(err, "cannot scan versions")
}
return versions, nil
}