/
migrate.go
157 lines (128 loc) · 3.94 KB
/
migrate.go
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package db
import (
"database/sql"
"embed"
"fmt"
"io/ioutil"
"os"
"strings"
"time"
"github.com/rs/zerolog/log"
"github.com/sirgwain/craig-stars/config"
"github.com/golang-migrate/migrate/v4"
"github.com/golang-migrate/migrate/v4/database/sqlite3"
"github.com/golang-migrate/migrate/v4/source/iofs"
_ "github.com/mattn/go-sqlite3"
)
//go:embed schema/users/*.sql
var usersSchemaFiles embed.FS
//go:embed schema/games/*.sql
var gamesSchemaFiles embed.FS
//go:embed schema/memory/*.sql
var memorySchemaFiles embed.FS
func (c *dbConn) mustMigrate(cfg *config.Config) {
if !c.usersInMemory {
c.mustMigrateDatabase(cfg.Database.UsersFilename, usersSchemaFiles, "schema/users", !cfg.Database.Recreate)
}
if !c.databaseInMemory {
c.mustMigrateDatabase(cfg.Database.Filename, gamesSchemaFiles, "schema/games", !cfg.Database.Recreate)
}
}
// in memory databases are different because the user and games database has to live in the same
// memory space so we have to "migrate" them together
func (c *dbConn) setupInMemoryDatabase() {
schema, err := iofs.New(memorySchemaFiles, "schema/memory")
if err != nil {
log.Fatal().Err(err).Msg("loading embedded schema")
}
config := &sqlite3.Config{
MigrationsTable: "my_migration_table",
}
driver, err := sqlite3.WithInstance(c.dbRead.DB, config)
if err != nil {
log.Fatal().Err(err).Msg("creating database driver")
}
m, err := migrate.NewWithInstance("iofs", schema, "users", driver)
if err != nil {
log.Fatal().Err(err).Msg("creating migration")
}
err = m.Up()
if err != nil {
log.Fatal().Err(err).Msg("migrating users")
}
}
func (c *dbConn) mustMigrateDatabase(datasource string, fs embed.FS, path string, backup bool) {
d, err := iofs.New(fs, path)
if err != nil {
log.Fatal().Err(err).Msg("loading embedded schema")
}
config := &sqlite3.Config{
MigrationsTable: "my_migration_table",
}
db, err := sql.Open("sqlite3", datasource)
defer func() {
// close this db connection, we'll open a new joined connection after migration
if err := db.Close(); err != nil {
log.Fatal().Err(err).Msg("failed to close database after migration")
}
}()
if err != nil {
log.Fatal().Err(err).Msg("opening database")
}
driver, err := sqlite3.WithInstance(db, config)
if err != nil {
log.Fatal().Err(err).Msg("creating database driver")
}
m, err := migrate.NewWithInstance("iofs", d, datasource, driver)
if err != nil {
log.Fatal().Err(err).Msg("creating migration")
}
version, _, err := m.Version()
if err != nil && err != migrate.ErrNilVersion {
log.Fatal().Err(err).Msg("get database version")
}
log.Info().Msgf("database %s is version %d", path, version)
var backupFile string
if backup {
backupFile = c.mustBackup(datasource, version)
}
err = m.Up()
if err == migrate.ErrNoChange {
log.Info().Msgf("database %s, no migration required", path)
if backup {
// remove the backup, we don't need it
os.Remove(backupFile)
}
} else if err == nil {
log.Info().Msgf("database %s migrated", path)
}
if err != nil && err != migrate.ErrNoChange {
log.Fatal().Err(err).Msg("migrating database")
}
}
func (c *dbConn) mustBackup(filename string, version uint) string {
if strings.Contains(filename, ":memory") {
log.Debug().Msg("not backing up in memory db")
return ""
}
// timestamp code from https://gist.github.com/rustyeddy/77f17f4f0fb83cc87115eb72a23f18f7
ts := time.Now().UTC().Format(time.RFC3339)
backup := fmt.Sprintf("%s.%d.%s", filename, version, strings.Replace(ts, ":", "", -1))
log.Info().Msgf("backing up %s -> %s", filename, backup)
if err := c.copyFile(filename, backup); err != nil {
log.Fatal().Err(err).Msgf("backup %s -> %s", filename, backup)
}
return backup
}
// copy a file from one place to another
func (c *dbConn) copyFile(sourceFile, destinationFile string) error {
input, err := ioutil.ReadFile(sourceFile)
if err != nil {
return err
}
err = ioutil.WriteFile(destinationFile, input, 0644)
if err != nil {
return err
}
return nil
}