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ssb: Faster loads by encouraging the right queries with CTEs in fetch_about.
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Cory McWilliams
2025-05-07 17:52:02 -04:00
parent b3cedf2baa
commit f1ced31f69
2 changed files with 56 additions and 47 deletions
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2
apps/ssb.json
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@@ -1,5 +1,5 @@
{
"type": "tildefriends-app",
"emoji": "🦀",
"previous": "&YeFLcHjD39FzsciGDfXuLd0hPzu4Rrp7QlMA7NaUCio=.sha256"
"previous": "&RkHUl/WRe0UpvTB2W6cw0f4AeupL/2PEI1pXg5PDXBg=.sha256"
}

39
apps/ssb/tf-app.js
View File

@@ -177,6 +177,7 @@ class TfElement extends LitElement {
}
}
const k_account_chunk_size = 4096;
const k_chunk_size = 1024;
let min_row_id = 0;
console.log(
@@ -189,43 +190,49 @@ class TfElement extends LitElement {
);
try {
while (true) {
let max_seen;
for (let account_chunk = 0; account_chunk < ids.length; account_chunk += k_account_chunk_size) {
let ids_chunk = ids.slice(account_chunk, account_chunk + k_account_chunk_size);
let abouts = await tfrpc.rpc.query(
`
SELECT * FROM (
WITH
past AS (
SELECT
messages.rowid AS rowid, messages.author, json(messages.content) AS content, messages.sequence
FROM
messages,
json_each(?1) AS following
messages
WHERE
messages.author = following.value AND
messages.content ->> 'type' = 'about' AND
messages.rowid > ?3 AND
messages.rowid <= ?4
UNION
messages.rowid <= ?4 AND
messages.content ->> 'type' = 'about'
),
current AS (
SELECT
messages.rowid AS rowid, messages.author, json(messages.content) AS content, messages.sequence
FROM
messages,
json_each(?2) AS following
messages
WHERE
messages.author = following.value AND
messages.content ->> 'type' = 'about' AND
messages.rowid > ?6 AND
messages.rowid <= ?4
messages.rowid <= ?4 AND
messages.content ->> 'type' = 'about'
)
SELECT * FROM past
JOIN json_each(?1) AS following
ON past.author = following.value
UNION SELECT * FROM current
JOIN json_each(?2) AS following
ON current.author = following.value
ORDER BY rowid LIMIT ?5
`,
[
JSON.stringify(ids.filter((id) => cache.about[id])),
JSON.stringify(ids.filter((id) => !cache.about[id])),
JSON.stringify(ids_chunk.filter((id) => cache.about[id])),
JSON.stringify(ids_chunk.filter((id) => !cache.about[id])),
cache.last_row_id,
max_row_id,
k_chunk_size,
min_row_id,
]
);
let max_seen;
for (let about of abouts) {
let content = JSON.parse(about.content);
if (content.about === about.author) {
@@ -238,6 +245,8 @@ class TfElement extends LitElement {
}
max_seen = about.rowid;
}
console.log(account_chunk, '/', ids.length, 'accounts');
}
console.log(
'cache =',
cache.last_row_id,