1 files changed, 116 insertions, 0 deletions
diff --git a/internal/cache/emoji.go b/internal/cache/emoji.go
new file mode 100644
index 000000000..eda7583ea
--- /dev/null
+++ b/internal/cache/emoji.go
@@ -0,0 +1,116 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   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 (
+	"time"
+
+	"codeberg.org/gruf/go-cache/v2"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
+
+// EmojiCache is a cache wrapper to provide ID and URI lookups for gtsmodel.Emoji
+type EmojiCache struct {
+	cache cache.LookupCache[string, string, *gtsmodel.Emoji]
+}
+
+// NewEmojiCache returns a new instantiated EmojiCache object
+func NewEmojiCache() *EmojiCache {
+	c := &EmojiCache{}
+	c.cache = cache.NewLookup(cache.LookupCfg[string, string, *gtsmodel.Emoji]{
+		RegisterLookups: func(lm *cache.LookupMap[string, string]) {
+			lm.RegisterLookup("uri")
+			lm.RegisterLookup("shortcodedomain")
+		},
+
+		AddLookups: func(lm *cache.LookupMap[string, string], emoji *gtsmodel.Emoji) {
+			if uri := emoji.URI; uri != "" {
+				lm.Set("uri", uri, emoji.URI)
+				lm.Set("shortcodedomain", shortcodeDomainKey(emoji.Shortcode, emoji.Domain), emoji.ID)
+			}
+		},
+
+		DeleteLookups: func(lm *cache.LookupMap[string, string], emoji *gtsmodel.Emoji) {
+			if uri := emoji.URI; uri != "" {
+				lm.Delete("uri", uri)
+				lm.Delete("shortcodedomain", shortcodeDomainKey(emoji.Shortcode, emoji.Domain))
+			}
+		},
+	})
+	c.cache.SetTTL(time.Minute*5, false)
+	c.cache.Start(time.Second * 10)
+	return c
+}
+
+// GetByID attempts to fetch an emoji from the cache by its ID, you will receive a copy for thread-safety
+func (c *EmojiCache) GetByID(id string) (*gtsmodel.Emoji, bool) {
+	return c.cache.Get(id)
+}
+
+// GetByURI attempts to fetch an emoji from the cache by its URI, you will receive a copy for thread-safety
+func (c *EmojiCache) GetByURI(uri string) (*gtsmodel.Emoji, bool) {
+	return c.cache.GetBy("uri", uri)
+}
+
+func (c *EmojiCache) GetByShortcodeDomain(shortcode string, domain string) (*gtsmodel.Emoji, bool) {
+	return c.cache.GetBy("shortcodedomain", shortcodeDomainKey(shortcode, domain))
+}
+
+// Put places an emoji in the cache, ensuring that the object place is a copy for thread-safety
+func (c *EmojiCache) Put(emoji *gtsmodel.Emoji) {
+	if emoji == nil || emoji.ID == "" {
+		panic("invalid emoji")
+	}
+	c.cache.Set(emoji.ID, copyEmoji(emoji))
+}
+
+// copyEmoji performs a surface-level copy of emoji, only keeping attached IDs intact, not the objects.
+// due to all the data being copied being 99% primitive types or strings (which are immutable and passed by ptr)
+// this should be a relatively cheap process
+func copyEmoji(emoji *gtsmodel.Emoji) *gtsmodel.Emoji {
+	return &gtsmodel.Emoji{
+		ID:                     emoji.ID,
+		CreatedAt:              emoji.CreatedAt,
+		UpdatedAt:              emoji.UpdatedAt,
+		Shortcode:              emoji.Shortcode,
+		Domain:                 emoji.Domain,
+		ImageRemoteURL:         emoji.ImageRemoteURL,
+		ImageStaticRemoteURL:   emoji.ImageStaticRemoteURL,
+		ImageURL:               emoji.ImageURL,
+		ImageStaticURL:         emoji.ImageStaticURL,
+		ImagePath:              emoji.ImagePath,
+		ImageStaticPath:        emoji.ImageStaticPath,
+		ImageContentType:       emoji.ImageContentType,
+		ImageStaticContentType: emoji.ImageStaticContentType,
+		ImageFileSize:          emoji.ImageFileSize,
+		ImageStaticFileSize:    emoji.ImageStaticFileSize,
+		ImageUpdatedAt:         emoji.ImageUpdatedAt,
+		Disabled:               copyBoolPtr(emoji.Disabled),
+		URI:                    emoji.URI,
+		VisibleInPicker:        copyBoolPtr(emoji.VisibleInPicker),
+		CategoryID:             emoji.CategoryID,
+	}
+}
+
+func shortcodeDomainKey(shortcode string, domain string) string {
+	if domain != "" {
+		return shortcode + "@" + domain
+	}
+	return shortcode
+}