mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-25 13:16:40 +00:00
77 lines
2.2 KiB
Go
77 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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"codeberg.org/gruf/go-cache/v3/ttl"
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"golang.org/x/exp/slices"
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)
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// SliceCache wraps a ttl.Cache to provide simple loader-callback
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// functions for fetching + caching slices of objects (e.g. IDs).
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type SliceCache[T any] struct {
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*ttl.Cache[string, []T]
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}
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// Load will attempt to load an existing slice from the cache for the given key, else calling the provided load function and caching the result.
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func (c *SliceCache[T]) Load(key string, load func() ([]T, error)) ([]T, error) {
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// Look for follow IDs list in cache under this key.
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data, ok := c.Get(key)
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if !ok {
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var err error
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// Not cached, load!
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data, err = load()
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if err != nil {
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return nil, err
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}
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// Store the data.
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c.Set(key, data)
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}
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// Return data clone for safety.
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return slices.Clone(data), nil
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}
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// LoadRange is functionally the same as .Load(), but will pass the result through provided reslice function before returning a cloned result.
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func (c *SliceCache[T]) LoadRange(key string, load func() ([]T, error), reslice func([]T) []T) ([]T, error) {
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// Look for follow IDs list in cache under this key.
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data, ok := c.Get(key)
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if !ok {
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var err error
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// Not cached, load!
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data, err = load()
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if err != nil {
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return nil, err
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}
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// Store the data.
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c.Set(key, data)
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}
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// Reslice to range.
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slice := reslice(data)
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// Return range clone for safety.
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return slices.Clone(slice), nil
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}
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