gotosocial/internal/db/bundb/emoji.go

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/*
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 bundb
import (
"context"
"strings"
"github.com/superseriousbusiness/gotosocial/internal/cache"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/uptrace/bun"
"github.com/uptrace/bun/dialect"
)
type emojiDB struct {
conn *DBConn
cache *cache.EmojiCache
}
func (e *emojiDB) newEmojiQ(emoji *gtsmodel.Emoji) *bun.SelectQuery {
return e.conn.
NewSelect().
Model(emoji)
}
func (e *emojiDB) PutEmoji(ctx context.Context, emoji *gtsmodel.Emoji) db.Error {
if _, err := e.conn.NewInsert().Model(emoji).Exec(ctx); err != nil {
return e.conn.ProcessError(err)
}
e.cache.Put(emoji)
return nil
}
func (e *emojiDB) GetEmojis(ctx context.Context, domain string, includeDisabled bool, includeEnabled bool, shortcode string, maxShortcodeDomain string, minShortcodeDomain string, limit int) ([]*gtsmodel.Emoji, db.Error) {
emojiIDs := []string{}
subQuery := e.conn.
NewSelect().
ColumnExpr("? AS ?", bun.Ident("emoji.id"), bun.Ident("emoji_ids"))
// To ensure consistent ordering and make paging possible, we sort not by shortcode
// but by [shortcode]@[domain]. Because sqlite and postgres have different syntax
// for concatenation, that means we need to switch here. Depending on which driver
// is in use, query will look something like this (sqlite):
//
// SELECT
// "emoji"."id" AS "emoji_ids",
// lower("emoji"."shortcode" || '@' || COALESCE("emoji"."domain", '')) AS "shortcode_domain"
// FROM
// "emojis" AS "emoji"
// ORDER BY
// "shortcode_domain" ASC
//
// Or like this (postgres):
//
// SELECT
// "emoji"."id" AS "emoji_ids",
// LOWER(CONCAT("emoji"."shortcode", '@', COALESCE("emoji"."domain", ''))) AS "shortcode_domain"
// FROM
// "emojis" AS "emoji"
// ORDER BY
// "shortcode_domain" ASC
switch e.conn.Dialect().Name() {
case dialect.SQLite:
subQuery = subQuery.ColumnExpr("LOWER(? || ? || COALESCE(?, ?)) AS ?", bun.Ident("emoji.shortcode"), "@", bun.Ident("emoji.domain"), "", bun.Ident("shortcode_domain"))
case dialect.PG:
subQuery = subQuery.ColumnExpr("LOWER(CONCAT(?, ?, COALESCE(?, ?))) AS ?", bun.Ident("emoji.shortcode"), "@", bun.Ident("emoji.domain"), "", bun.Ident("shortcode_domain"))
default:
panic("db conn was neither pg not sqlite")
}
subQuery = subQuery.TableExpr("? AS ?", bun.Ident("emojis"), bun.Ident("emoji"))
if domain == "" {
subQuery = subQuery.Where("? IS NULL", bun.Ident("emoji.domain"))
} else if domain != db.EmojiAllDomains {
subQuery = subQuery.Where("? = ?", bun.Ident("emoji.domain"), domain)
}
switch {
case includeDisabled && !includeEnabled:
// show only disabled emojis
subQuery = subQuery.Where("? = ?", bun.Ident("emoji.disabled"), true)
case includeEnabled && !includeDisabled:
// show only enabled emojis
subQuery = subQuery.Where("? = ?", bun.Ident("emoji.disabled"), false)
default:
// show emojis regardless of emoji.disabled value
}
if shortcode != "" {
subQuery = subQuery.Where("LOWER(?) = LOWER(?)", bun.Ident("emoji.shortcode"), shortcode)
}
// assume we want to sort ASC (a-z) unless informed otherwise
order := "ASC"
if maxShortcodeDomain != "" {
subQuery = subQuery.Where("? > LOWER(?)", bun.Ident("shortcode_domain"), maxShortcodeDomain)
}
if minShortcodeDomain != "" {
subQuery = subQuery.Where("? < LOWER(?)", bun.Ident("shortcode_domain"), minShortcodeDomain)
// if we have a minShortcodeDomain we're paging upwards/backwards
order = "DESC"
}
subQuery = subQuery.Order("shortcode_domain " + order)
if limit > 0 {
subQuery = subQuery.Limit(limit)
}
// Wrap the subQuery in a query, since we don't need to select the shortcode_domain column.
//
// The final query will come out looking something like...
//
// SELECT
// "subquery"."emoji_ids"
// FROM (
// SELECT
// "emoji"."id" AS "emoji_ids",
// LOWER("emoji"."shortcode" || '@' || COALESCE("emoji"."domain", '')) AS "shortcode_domain"
// FROM
// "emojis" AS "emoji"
// ORDER BY
// "shortcode_domain" ASC
// ) AS "subquery"
if err := e.conn.
NewSelect().
Column("subquery.emoji_ids").
TableExpr("(?) AS ?", subQuery, bun.Ident("subquery")).
Scan(ctx, &emojiIDs); err != nil {
return nil, e.conn.ProcessError(err)
}
if order == "DESC" {
// Reverse the slice order so the caller still
// gets emojis in expected a-z alphabetical order.
//
// See https://github.com/golang/go/wiki/SliceTricks#reversing
for i := len(emojiIDs)/2 - 1; i >= 0; i-- {
opp := len(emojiIDs) - 1 - i
emojiIDs[i], emojiIDs[opp] = emojiIDs[opp], emojiIDs[i]
}
}
return e.emojisFromIDs(ctx, emojiIDs)
}
func (e *emojiDB) GetUseableEmojis(ctx context.Context) ([]*gtsmodel.Emoji, db.Error) {
emojiIDs := []string{}
q := e.conn.
NewSelect().
TableExpr("? AS ?", bun.Ident("emojis"), bun.Ident("emoji")).
Column("emoji.id").
Where("? = ?", bun.Ident("emoji.visible_in_picker"), true).
Where("? = ?", bun.Ident("emoji.disabled"), false).
Where("? IS NULL", bun.Ident("emoji.domain")).
Order("emoji.shortcode ASC")
if err := q.Scan(ctx, &emojiIDs); err != nil {
return nil, e.conn.ProcessError(err)
}
return e.emojisFromIDs(ctx, emojiIDs)
}
func (e *emojiDB) GetEmojiByID(ctx context.Context, id string) (*gtsmodel.Emoji, db.Error) {
return e.getEmoji(
ctx,
func() (*gtsmodel.Emoji, bool) {
return e.cache.GetByID(id)
},
func(emoji *gtsmodel.Emoji) error {
return e.newEmojiQ(emoji).Where("? = ?", bun.Ident("emoji.id"), id).Scan(ctx)
},
)
}
func (e *emojiDB) GetEmojiByURI(ctx context.Context, uri string) (*gtsmodel.Emoji, db.Error) {
return e.getEmoji(
ctx,
func() (*gtsmodel.Emoji, bool) {
return e.cache.GetByURI(uri)
},
func(emoji *gtsmodel.Emoji) error {
return e.newEmojiQ(emoji).Where("? = ?", bun.Ident("emoji.uri"), uri).Scan(ctx)
},
)
}
func (e *emojiDB) GetEmojiByShortcodeDomain(ctx context.Context, shortcode string, domain string) (*gtsmodel.Emoji, db.Error) {
return e.getEmoji(
ctx,
func() (*gtsmodel.Emoji, bool) {
return e.cache.GetByShortcodeDomain(shortcode, domain)
},
func(emoji *gtsmodel.Emoji) error {
q := e.newEmojiQ(emoji)
if domain != "" {
q = q.Where("? = ?", bun.Ident("emoji.shortcode"), shortcode)
q = q.Where("? = ?", bun.Ident("emoji.domain"), domain)
} else {
q = q.Where("? = ?", bun.Ident("emoji.shortcode"), strings.ToLower(shortcode))
q = q.Where("? IS NULL", bun.Ident("emoji.domain"))
}
return q.Scan(ctx)
},
)
}
func (e *emojiDB) getEmoji(ctx context.Context, cacheGet func() (*gtsmodel.Emoji, bool), dbQuery func(*gtsmodel.Emoji) error) (*gtsmodel.Emoji, db.Error) {
// Attempt to fetch cached emoji
emoji, cached := cacheGet()
if !cached {
emoji = &gtsmodel.Emoji{}
// Not cached! Perform database query
err := dbQuery(emoji)
if err != nil {
return nil, e.conn.ProcessError(err)
}
// Place in the cache
e.cache.Put(emoji)
}
return emoji, nil
}
func (e *emojiDB) emojisFromIDs(ctx context.Context, emojiIDs []string) ([]*gtsmodel.Emoji, db.Error) {
// Catch case of no emojis early
if len(emojiIDs) == 0 {
return nil, db.ErrNoEntries
}
emojis := make([]*gtsmodel.Emoji, 0, len(emojiIDs))
for _, id := range emojiIDs {
emoji, err := e.GetEmojiByID(ctx, id)
if err != nil {
log.Errorf("emojisFromIDs: error getting emoji %q: %v", id, err)
}
emojis = append(emojis, emoji)
}
return emojis, nil
}