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Monorepo for Tangled
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Go
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import ( "context" "database/sql" "errors" "fmt" "log/slog" "reflect" "strings"
"github.com/mattn/go-sqlite3")
func IsUniqueViolation(err error) bool { var sqlErr sqlite3.Error if !errors.As(err, &sqlErr) { return false } return sqlErr.ExtendedCode == sqlite3.ErrConstraintUnique || sqlErr.ExtendedCode == sqlite3.ErrConstraintPrimaryKey}
type migrationFn = func(*sql.Tx) error
func RunMigration(c *sql.Conn, logger *slog.Logger, name string, migrationFn migrationFn) error { logger = logger.With("migration", name)
tx, err := c.BeginTx(context.Background(), nil) if err != nil { return err } defer tx.Rollback()
var exists bool err = tx.QueryRow("select exists (select 1 from migrations where name = ?)", name).Scan(&exists) if err != nil { return err }
if !exists { // run migration err = migrationFn(tx) if err != nil { logger.Error("failed to run migration", "err", err) return err }
// mark migration as complete _, err = tx.Exec("insert into migrations (name) values (?)", name) if err != nil { logger.Error("failed to mark migration as complete", "err", err) return err }
// commit the transaction if err := tx.Commit(); err != nil { return err }
logger.Info("migration applied successfully") } else { logger.Warn("skipped migration, already applied") }
return nil}
type Filter struct { Key string arg any Cmp string}
func newFilter(key, cmp string, arg any) Filter { return Filter{ Key: key, arg: arg, Cmp: cmp, }}
func FilterEq(key string, arg any) Filter { return newFilter(key, "=", arg) }func FilterNotEq(key string, arg any) Filter { return newFilter(key, "<>", arg) }func FilterGte(key string, arg any) Filter { return newFilter(key, ">=", arg) }func FilterLte(key string, arg any) Filter { return newFilter(key, "<=", arg) }func FilterIs(key string, arg any) Filter { return newFilter(key, "is", arg) }func FilterIsNot(key string, arg any) Filter { return newFilter(key, "is not", arg) }func FilterIn(key string, arg any) Filter { return newFilter(key, "in", arg) }func FilterLike(key string, arg any) Filter { return newFilter(key, "like", arg) }func FilterNotLike(key string, arg any) Filter { return newFilter(key, "not like", arg) }func FilterContains(key string, arg any) Filter { return newFilter(key, "like", fmt.Sprintf("%%%v%%", arg))}
// FilterInSubquery compiles to `key in (subquery)`, binding args within the// subquery. Prefer this over FilterIn with a large materialized list: it// keeps the query text constant and lets sqlite plan a semi-join.func FilterInSubquery(key, subquery string, args ...any) Filter { return newFilter(key, "in", subqueryArg{query: subquery, args: args})}
type subqueryArg struct { query string args []any}
func (f Filter) Condition() string { if sub, ok := f.arg.(subqueryArg); ok { return fmt.Sprintf("%s %s (%s)", f.Key, f.Cmp, sub.query) }
rv := reflect.ValueOf(f.arg) kind := rv.Kind()
// if we have `FilterIn(k, [1, 2, 3])`, compile it down to `k in (?, ?, ?)` if (kind == reflect.Slice && rv.Type().Elem().Kind() != reflect.Uint8) || kind == reflect.Array { if rv.Len() == 0 { // always false return "1 = 0" }
placeholders := make([]string, rv.Len()) for i := range placeholders { placeholders[i] = "?" }
return fmt.Sprintf("%s %s (%s)", f.Key, f.Cmp, strings.Join(placeholders, ", ")) }
return fmt.Sprintf("%s %s ?", f.Key, f.Cmp)}
func (f Filter) Arg() []any { if sub, ok := f.arg.(subqueryArg); ok { return sub.args }
rv := reflect.ValueOf(f.arg) kind := rv.Kind() if (kind == reflect.Slice && rv.Type().Elem().Kind() != reflect.Uint8) || kind == reflect.Array { if rv.Len() == 0 { return nil }
out := make([]any, rv.Len()) for i := range rv.Len() { out[i] = rv.Index(i).Interface() } return out }
return []any{f.arg}}