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package common
import (
"context"
"database/sql"
"embed"
"errors"
"fmt"
"log/slog"
"path"
"regexp"
"strconv"
"strings"
"github.com/nyttikord/avl"
)
var regexpMigration = regexp.MustCompile(`(\d{3})-(.*)\.sql`)
type migrationData struct {
id uint64
name string
content string
}
func Migrate(ctx context.Context, log *slog.Logger, db *sql.DB, migrations embed.FS, dir string) error {
entries, err := migrations.ReadDir(dir)
if err != nil {
return err
}
tree := avl.NewKeySimple[uint64, migrationData]()
for _, entry := range entries {
if strings.HasSuffix(entry.Name(), ".sql") {
log.Debug("reading migration...", "path", dir+"/"+entry.Name())
subs := regexpMigration.FindStringSubmatch(entry.Name())
if len(subs) < 3 {
return fmt.Errorf("invalid migration name %s", entry.Name())
}
id, _ := strconv.ParseUint(subs[1], 10, 16)
b, err := migrations.ReadFile(path.Join(dir, entry.Name()))
if err != nil {
return err
}
tree.Insert(id, migrationData{id, subs[2], string(b)})
} else {
log.Warn("invalid migration entry, skipping", "path", dir+"/"+entry.Name())
}
}
for _, mig := range tree.Sort() {
log.Debug("migrating...", "id", mig.id, "name", mig.name)
_, err := db.ExecContext(ctx, mig.content)
if err != nil {
log.Error("migrating", "id", mig.id, "name", mig.name)
return err
}
}
return nil
}
type Loadable interface {
Load(context.Context, *sql.DB, *sql.Rows) error
}
func GetValues[T Loadable](ctx context.Context, db *sql.DB, table, data, where string, args ...any) ([]T, error) {
arr := make([]T, 0)
rows, err := db.QueryContext(
ctx,
fmt.Sprintf(`SELECT %s FROM %s WHERE %s`, data, table, where),
args...,
)
if err != nil {
if !errors.Is(err, sql.ErrNoRows) {
return arr, err
}
} else {
defer rows.Close()
for rows.Next() {
var v T
err = v.Load(ctx, db, rows)
if err != nil {
return nil, err
}
arr = append(arr, v)
}
}
return arr, nil
}
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