mirror of
https://github.com/superseriousbusiness/gotosocial.git
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72 lines
2.2 KiB
Go
72 lines
2.2 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 cache
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import (
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"database/sql"
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"errors"
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"time"
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errorsv2 "codeberg.org/gruf/go-errors/v2"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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)
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// SentinelError is an error that can be returned and checked against to indicate a non-permanent
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// error return from a cache loader callback, e.g. a temporary situation that will soon be fixed.
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var SentinelError = errors.New("BUG: error should not be returned") //nolint:revive
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// ignoreErrors is an error matching function used to signal which errors
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// the result caches should NOT hold onto. these amount to anything non-permanent.
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func ignoreErrors(err error) bool {
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return !errorsv2.IsV2(
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err,
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// the only cacheable errs,
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// i.e anything permanent
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// (until invalidation).
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db.ErrNoEntries,
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db.ErrAlreadyExists,
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sql.ErrNoRows,
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)
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}
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// nocopy when embedded will signal linter to
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// error on pass-by-value of parent struct.
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type nocopy struct{}
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func (*nocopy) Lock() {}
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func (*nocopy) Unlock() {}
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// tryUntil will attempt to call 'do' for 'count' attempts, before panicking with 'msg'.
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func tryUntil(msg string, count int, do func() bool) {
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for i := 0; i < count; i++ {
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if do() {
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// success.
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return
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}
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// Sleep for a little before retry (a bcakoff).
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time.Sleep(time.Millisecond * 1 << (i + 1))
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}
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// panic on total failure as this shouldn't happen.
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log.Panicf(nil, "failed %s after %d tries", msg, count)
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}
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