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perf(storage): truncate strings on go's side instead of pgsql's

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There is no need to send the whole title and content to have them truncated on
postgresql's side when we can do this client-side. This should save some
memory on the database's side, as well as some bandwidth
if it's located on another server. And it makes the SQL queries a tad more
readable as well.
This commit is contained in:
jvoisin 2025-06-21 01:04:37 +02:00 • committed by Frédéric Guillot
parent aed99e65c1
commit 99c5bcdb01
1 changed files with 17 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

25
internal/storage/entry.go
View file

@ -18,6 +18,8 @@ import (
"github.com/lib/pq"
)
const truncationLen = 500000
// CountAllEntries returns the number of entries for each status in the database.
func (s *Storage) CountAllEntries() map[string]int64 {
rows, err := s.db.Query(`SELECT status, count(*) FROM entries GROUP BY status`)
@ -78,12 +80,12 @@ func (s *Storage) UpdateEntryTitleAndContent(entry *model.Entry) error {
title=$1,
content=$2,
reading_time=$3,
document_vectors = setweight(to_tsvector(left(coalesce($1, ''), 500000)), 'A') || setweight(to_tsvector(left(coalesce($2, ''), 500000)), 'B')
document_vectors = setweight(to_tsvector($1), 'A') || setweight(to_tsvector($2), 'B')
WHERE
id=$4 AND user_id=$5
`
if _, err := s.db.Exec(query, entry.Title, entry.Content, entry.ReadingTime, entry.ID, entry.UserID); err != nil {
if _, err := s.db.Exec(query, truncateString(entry.Title), truncateString(entry.Content), entry.ReadingTime, entry.ID, entry.UserID); err != nil {
return fmt.Errorf(`store: unable to update entry #%d: %v`, entry.ID, err)
}
@ -122,7 +124,7 @@ func (s *Storage) createEntry(tx *sql.Tx, entry *model.Entry) error {
$9,
$10,
now(),
setweight(to_tsvector(left(coalesce($1, ''), 500000)), 'A') || setweight(to_tsvector(left(coalesce($6, ''), 500000)), 'B'),
setweight(to_tsvector($1), 'A') || setweight(to_tsvector($6), 'B'),
$11
)
RETURNING
@ -130,12 +132,12 @@ func (s *Storage) createEntry(tx *sql.Tx, entry *model.Entry) error {
`
err := tx.QueryRow(
query,
entry.Title,
truncateString(entry.Title),
entry.Hash,
entry.URL,
entry.CommentsURL,
entry.Date,
entry.Content,
truncateString(entry.Content),
entry.Author,
entry.UserID,
entry.FeedID,
@ -178,7 +180,7 @@ func (s *Storage) updateEntry(tx *sql.Tx, entry *model.Entry) error {
content=$4,
author=$5,
reading_time=$6,
document_vectors = setweight(to_tsvector(left(coalesce($1, ''), 500000)), 'A') || setweight(to_tsvector(left(coalesce($4, ''), 500000)), 'B'),
document_vectors = setweight(to_tsvector($1), 'A') || setweight(to_tsvector($4), 'B'),
tags=$10
WHERE
user_id=$7 AND feed_id=$8 AND hash=$9
@ -187,10 +189,10 @@ func (s *Storage) updateEntry(tx *sql.Tx, entry *model.Entry) error {
`
err := tx.QueryRow(
query,
entry.Title,
truncateString(entry.Title),
entry.URL,
entry.CommentsURL,
entry.Content,
truncateString(entry.Content),
entry.Author,
entry.ReadingTime,
entry.UserID,
@ -642,3 +644,10 @@ func removeEmpty(l []string) []string {
}
return finalSlice
}
func truncateString(s string) string {
if len(s) > truncationLen {
return s[:truncationLen]
}
return s
}