93 lines
2.3 KiB
Go
93 lines
2.3 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package bundb
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import (
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"context"
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"strings"
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"database/sql"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/uptrace/bun"
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)
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// processErrorResponse parses the given error and returns an appropriate DBError.
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func processErrorResponse(err error) db.Error {
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switch err {
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case nil:
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return nil
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case sql.ErrNoRows:
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return db.ErrNoEntries
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default:
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if strings.Contains(err.Error(), "duplicate key value violates unique constraint") {
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return db.ErrAlreadyExists
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}
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return err
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}
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}
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func exists(ctx context.Context, q *bun.SelectQuery) (bool, db.Error) {
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count, err := q.Count(ctx)
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exists := count != 0
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err = processErrorResponse(err)
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if err != nil {
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if err == db.ErrNoEntries {
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return false, nil
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}
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return false, err
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}
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return exists, nil
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}
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func notExists(ctx context.Context, q *bun.SelectQuery) (bool, db.Error) {
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count, err := q.Count(ctx)
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notExists := count == 0
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err = processErrorResponse(err)
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if err != nil {
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if err == db.ErrNoEntries {
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return true, nil
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}
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return false, err
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}
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return notExists, nil
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}
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// whereEmptyOrNull is a convenience function to return a bun WhereGroup that specifies
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// that the given column should be EITHER an empty string OR null.
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//
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// Use it as follows:
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//
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// q = q.WhereGroup(" AND ", whereEmptyOrNull("whatever_column"))
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func whereEmptyOrNull(column string) func(*bun.SelectQuery) *bun.SelectQuery {
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return func(q *bun.SelectQuery) *bun.SelectQuery {
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return q.
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WhereOr("? IS NULL", bun.Ident(column)).
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WhereOr("? = ''", bun.Ident(column))
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}
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}
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