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|
package libmkwebpage
import (
"database/sql"
"embed"
"errors"
"fmt"
"io"
"io/fs"
"os"
"path"
"slices"
"strconv"
"strings"
)
type migrations struct {
staticRoot embed.FS
dynamicRoot fs.FS
}
func (w *Webpage) NewMigrations(static embed.FS, dynamic fs.FS) *Webpage {
w.migrations = migrations{staticRoot: static, dynamicRoot: dynamic}
return w
}
func (w *Webpage) getMigrationRoot() fs.FS {
if w.IsDynamic() {
return w.migrations.dynamicRoot
}
return w.migrations.staticRoot
}
func (w *Webpage) ConnectDb() (*sql.DB, error) {
db, err := sql.Open("sqlite3", "./test.db")
if err != nil {
return nil, err
}
var dir fs.ReadDirFile
potenriallyDir, err := w.getMigrationRoot().Open("db")
if err != nil {
return nil, err
}
if foo, ok := potenriallyDir.(fs.ReadDirFile); !ok {
dir = foo
} else {
return nil, errors.New("db directory is not a directory")
}
files, err := dir.ReadDir(0)
if err != nil {
return nil, err
}
err = db.Ping()
if err != nil {
return nil, err
}
tx, err := db.Begin()
if err != nil {
return nil, err
}
defer tx.Rollback()
var migration_level int
rows := tx.QueryRow("SELECT level FROM __MIGRATIONLEVEL")
fmt.Fprintln(os.Stderr, *rows)
if rows.Scan(&migration_level) != nil {
fmt.Fprintln(os.Stderr, "Creating Migration-Metadata")
_, err := tx.Exec("CREATE TABLE __MIGRATIONLEVEL (level INTEGER PRIMARY KEY)")
if err != nil {
return nil, err
}
_, err = tx.Exec("INSERT INTO __MIGRATIONLEVEL(level) VALUES (0)")
if err != nil {
return nil, err
}
migration_level = 0
}
slices.SortFunc(files, func(a, b fs.DirEntry) int {
if a.Name() < b.Name() {
return -1
}
if a.Name() > b.Name() {
return 1
}
return 0
})
for _, file := range files {
if !file.Type().IsRegular() {
continue
}
id, err := strconv.Atoi(strings.Split(file.Name(), "-")[0])
if err != nil {
return nil, err
}
if migration_level < id {
fmt.Fprintln(os.Stderr, "Running Migration nr", id)
migration, err := w.getMigrationRoot().Open(path.Join("db", file.Name()))
if err != nil {
return nil, err
}
migrationContent, err := io.ReadAll(migration)
if err != nil {
return nil, err
}
_, err = tx.Exec(string(migrationContent))
if err != nil {
return nil, err
}
_, err = tx.Exec("UPDATE __MIGRATIONLEVEL SET level = ?", id)
if err != nil {
return nil, err
}
}
}
err = tx.Commit()
if err != nil {
return nil, err
}
return db, nil
}
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