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ql.go
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ql.go
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package ql
import (
"database/sql"
"fmt"
"io"
"io/ioutil"
"strings"
nurl "net/url"
_ "github.com/cznic/ql/driver"
"github.com/golang-migrate/migrate"
"github.com/golang-migrate/migrate/database"
)
func init() {
database.Register("ql", &Ql{})
}
var DefaultMigrationsTable = "schema_migrations"
var (
ErrDatabaseDirty = fmt.Errorf("database is dirty")
ErrNilConfig = fmt.Errorf("no config")
ErrNoDatabaseName = fmt.Errorf("no database name")
ErrAppendPEM = fmt.Errorf("failed to append PEM")
)
type Config struct {
MigrationsTable string
DatabaseName string
}
type Ql struct {
db *sql.DB
isLocked bool
config *Config
}
func WithInstance(instance *sql.DB, config *Config) (database.Driver, error) {
if config == nil {
return nil, ErrNilConfig
}
if err := instance.Ping(); err != nil {
return nil, err
}
if len(config.MigrationsTable) == 0 {
config.MigrationsTable = DefaultMigrationsTable
}
mx := &Ql{
db: instance,
config: config,
}
if err := mx.ensureVersionTable(); err != nil {
return nil, err
}
return mx, nil
}
func (m *Ql) ensureVersionTable() error {
tx, err := m.db.Begin()
if err != nil {
return err
}
if _, err := tx.Exec(fmt.Sprintf(`
CREATE TABLE IF NOT EXISTS %s (version uint64,dirty bool);
CREATE UNIQUE INDEX IF NOT EXISTS version_unique ON %s (version);
`, m.config.MigrationsTable, m.config.MigrationsTable)); err != nil {
if err := tx.Rollback(); err != nil {
return err
}
return err
}
if err := tx.Commit(); err != nil {
return err
}
return nil
}
func (m *Ql) Open(url string) (database.Driver, error) {
purl, err := nurl.Parse(url)
if err != nil {
return nil, err
}
dbfile := strings.Replace(migrate.FilterCustomQuery(purl).String(), "ql://", "", 1)
db, err := sql.Open("ql", dbfile)
if err != nil {
return nil, err
}
migrationsTable := purl.Query().Get("x-migrations-table")
if len(migrationsTable) == 0 {
migrationsTable = DefaultMigrationsTable
}
mx, err := WithInstance(db, &Config{
DatabaseName: purl.Path,
MigrationsTable: migrationsTable,
})
if err != nil {
return nil, err
}
return mx, nil
}
func (m *Ql) Close() error {
return m.db.Close()
}
func (m *Ql) Drop() error {
query := `SELECT Name FROM __Table`
tables, err := m.db.Query(query)
if err != nil {
return &database.Error{OrigErr: err, Query: []byte(query)}
}
defer tables.Close()
tableNames := make([]string, 0)
for tables.Next() {
var tableName string
if err := tables.Scan(&tableName); err != nil {
return err
}
if len(tableName) > 0 {
if strings.HasPrefix(tableName, "__") == false {
tableNames = append(tableNames, tableName)
}
}
}
if len(tableNames) > 0 {
for _, t := range tableNames {
query := "DROP TABLE " + t
err = m.executeQuery(query)
if err != nil {
return &database.Error{OrigErr: err, Query: []byte(query)}
}
}
if err := m.ensureVersionTable(); err != nil {
return err
}
}
return nil
}
func (m *Ql) Lock() error {
if m.isLocked {
return database.ErrLocked
}
m.isLocked = true
return nil
}
func (m *Ql) Unlock() error {
if !m.isLocked {
return nil
}
m.isLocked = false
return nil
}
func (m *Ql) Run(migration io.Reader) error {
migr, err := ioutil.ReadAll(migration)
if err != nil {
return err
}
query := string(migr[:])
return m.executeQuery(query)
}
func (m *Ql) executeQuery(query string) error {
tx, err := m.db.Begin()
if err != nil {
return &database.Error{OrigErr: err, Err: "transaction start failed"}
}
if _, err := tx.Exec(query); err != nil {
tx.Rollback()
return &database.Error{OrigErr: err, Query: []byte(query)}
}
if err := tx.Commit(); err != nil {
return &database.Error{OrigErr: err, Err: "transaction commit failed"}
}
return nil
}
func (m *Ql) SetVersion(version int, dirty bool) error {
tx, err := m.db.Begin()
if err != nil {
return &database.Error{OrigErr: err, Err: "transaction start failed"}
}
query := "TRUNCATE TABLE " + m.config.MigrationsTable
if _, err := tx.Exec(query); err != nil {
return &database.Error{OrigErr: err, Query: []byte(query)}
}
if version >= 0 {
query := fmt.Sprintf(`INSERT INTO %s (version, dirty) VALUES (%d, %t)`, m.config.MigrationsTable, version, dirty)
if _, err := tx.Exec(query); err != nil {
tx.Rollback()
return &database.Error{OrigErr: err, Query: []byte(query)}
}
}
if err := tx.Commit(); err != nil {
return &database.Error{OrigErr: err, Err: "transaction commit failed"}
}
return nil
}
func (m *Ql) Version() (version int, dirty bool, err error) {
query := "SELECT version, dirty FROM " + m.config.MigrationsTable + " LIMIT 1"
err = m.db.QueryRow(query).Scan(&version, &dirty)
if err != nil {
return database.NilVersion, false, nil
}
return version, dirty, nil
}