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5e2bf0bdca
* [chore] Remove years from all license headers Years or year ranges aren't required in license headers. Many projects have removed them in recent years and it avoids a bit of yearly toil. In many cases our copyright claim was also a bit dodgy since we added the 2021-2023 header to files created after 2021 but you can't claim copyright into the past that way. * [chore] Add license header check This ensures a license header is always added to any new file. This avoids maintainers/reviewers needing to remember to check for and ask for it in case a contribution doesn't include it. * [chore] Add missing license headers * [chore] Further updates to license header * Use the more common // indentend comment format * Remove the hack we had for the linter now that we use the // format * Add SPDX license identifier
44 lines
1.5 KiB
Go
44 lines
1.5 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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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//
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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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//
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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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package federatingdb
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import (
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"context"
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"errors"
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"net/url"
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)
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// Lock takes a lock for the object at the specified id. If an error
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// is returned, the lock must not have been taken.
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//
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// The lock must be able to succeed for an id that does not exist in
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// the database. This means acquiring the lock does not guarantee the
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// entry exists in the database.
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//
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// Locks are encouraged to be lightweight and in the Go layer, as some
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// processes require tight loops acquiring and releasing locks.
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//
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// Used to ensure race conditions in multiple requests do not occur.
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func (f *federatingDB) Lock(c context.Context, id *url.URL) (func(), error) {
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if id == nil {
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return nil, errors.New("Lock: id was nil")
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}
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unlock := f.locks.Lock(id.String())
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return unlock, nil
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}
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