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author | 2023-07-31 11:25:29 +0100 | |
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committer | 2023-07-31 11:25:29 +0100 | |
commit | ed2477ebea4c3ceec5949821f4950db9669a4a15 (patch) | |
tree | 1038d7abdfc787ddfc1febb326fd38775b189b85 /internal/cache/slice.go | |
parent | [bugfix/frontend] Decode URI component domain before showing on frontend (#2043) (diff) | |
download | gotosocial-ed2477ebea4c3ceec5949821f4950db9669a4a15.tar.xz |
[performance] cache follow, follow request and block ID lists (#2027)
Diffstat (limited to 'internal/cache/slice.go')
-rw-r--r-- | internal/cache/slice.go | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/internal/cache/slice.go b/internal/cache/slice.go new file mode 100644 index 000000000..194f20d4b --- /dev/null +++ b/internal/cache/slice.go @@ -0,0 +1,76 @@ +// GoToSocial +// Copyright (C) GoToSocial Authors admin@gotosocial.org +// SPDX-License-Identifier: AGPL-3.0-or-later +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU Affero General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Affero General Public License for more details. +// +// You should have received a copy of the GNU Affero General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. + +package cache + +import ( + "codeberg.org/gruf/go-cache/v3/ttl" + "golang.org/x/exp/slices" +) + +// SliceCache wraps a ttl.Cache to provide simple loader-callback +// functions for fetching + caching slices of objects (e.g. IDs). +type SliceCache[T any] struct { + *ttl.Cache[string, []T] +} + +// 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. +func (c *SliceCache[T]) Load(key string, load func() ([]T, error)) ([]T, error) { + // Look for follow IDs list in cache under this key. + data, ok := c.Get(key) + + if !ok { + var err error + + // Not cached, load! + data, err = load() + if err != nil { + return nil, err + } + + // Store the data. + c.Set(key, data) + } + + // Return data clone for safety. + return slices.Clone(data), nil +} + +// LoadRange is functionally the same as .Load(), but will pass the result through provided reslice function before returning a cloned result. +func (c *SliceCache[T]) LoadRange(key string, load func() ([]T, error), reslice func([]T) []T) ([]T, error) { + // Look for follow IDs list in cache under this key. + data, ok := c.Get(key) + + if !ok { + var err error + + // Not cached, load! + data, err = load() + if err != nil { + return nil, err + } + + // Store the data. + c.Set(key, data) + } + + // Reslice to range. + slice := reslice(data) + + // Return range clone for safety. + return slices.Clone(slice), nil +} |