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Oh yeah, I was playing with the follow app.

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git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4368 ed5197a5-7fde-0310-b194-c3ffbd925b24
This commit is contained in:
Cory McWilliams 2023-07-27 01:47:50 +00:00
parent 1102feaac3
commit 3319df3df0
1 changed files with 187 additions and 77 deletions
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264
apps/follow/app.js
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@ -1,73 +1,163 @@
var g_following_cache = {}; let g_about_cache = {};
var g_following_deep_cache = {};
var g_about_cache = {};
async function following(db, id) { async function query(sql, args) {
if (g_following_cache[id]) { let result = [];
return g_following_cache[id]; await ssb.sqlAsync(sql, args, function(row) {
} result.push(row);
var o = await db.get(id + ":following"); });
const k_version = 5; return result;
var f = o ? JSON.parse(o) : o;
if (!f || f.version != k_version) {
f = {users: [], sequence: 0, version: k_version};
}
f.users = new Set(f.users);
await ssb.sqlAsync(
"SELECT "+
" sequence, "+
" json_extract(content, '$.contact') AS contact, "+
" json_extract(content, '$.following') AS following "+
"FROM messages "+
"WHERE "+
" author = ?1 AND "+
" sequence > ?2 AND "+
" json_extract(content, '$.type') = 'contact' "+
"UNION SELECT MAX(sequence) AS sequence, NULL, NULL FROM messages WHERE author = ?1 "+
"ORDER BY sequence",
[id, f.sequence],
function(row) {
if (row.following) {
f.users.add(row.contact);
} else {
f.users.delete(row.contact);
}
f.sequence = row.sequence;
});
var as_set = f.users;
f.users = Array.from(f.users).sort();
var j = JSON.stringify(f);
if (o != j) {
await db.set(id + ":following", j);
}
f.users = as_set;
g_following_cache[id] = f.users;
return f.users;
} }
async function followingDeep(db, seed_ids, depth) { async function contacts_internal(id, last_row_id, following, max_row_id) {
if (depth <= 0) { let result = Object.assign({}, following[id] || {});
return seed_ids; result.following = result.following || {};
result.blocking = result.blocking || {};
let contacts = await query(
`
SELECT content FROM messages
WHERE author = ? AND
rowid > ? AND
rowid <= ? AND
json_extract(content, '$.type') = 'contact'
ORDER BY sequence
`,
[id, last_row_id, max_row_id]);
for (let row of contacts) {
let contact = JSON.parse(row.content);
if (contact.following === true) {
result.following[contact.contact] = true;
} else if (contact.following === false) {
delete result.following[contact.contact];
} else if (contact.blocking === true) {
result.blocking[contact.contact] = true;
} else if (contact.blocking === false) {
delete result.blocking[contact.contact];
}
} }
var key = JSON.stringify([seed_ids, depth]); following[id] = result;
if (g_following_deep_cache[key]) { return result;
return g_following_deep_cache[key]; }
async function contact(id, last_row_id, following, max_row_id) {
return await contacts_internal(id, last_row_id, following, max_row_id);
}
async function following_deep_internal(ids, depth, blocking, last_row_id, following, max_row_id) {
let contacts = await Promise.all([...new Set(ids)].map(x => contact(x, last_row_id, following, max_row_id)));
let result = {};
for (let i = 0; i < ids.length; i++) {
let id = ids[i];
let contact = contacts[i];
let all_blocking = Object.assign({}, contact.blocking, blocking);
let found = Object.keys(contact.following).filter(y => !all_blocking[y]);
let deeper = depth > 1 ? await following_deep_internal(found, depth - 1, all_blocking, last_row_id, following, max_row_id) : [];
result[id] = [id, ...found, ...deeper];
} }
var f = await Promise.all(seed_ids.map(x => following(db, x).then(x => [...x]))); return [...new Set(Object.values(result).flat())];
var ids = [].concat(...f); }
var x = await followingDeep(db, [...new Set(ids)].sort(), depth - 1);
x = [...new Set([].concat(...x, ...seed_ids))].sort(); async function following_deep(ids, depth, blocking) {
g_following_deep_cache[key] = x; let db = await database('cache');
return x; const k_cache_version = 5;
let cache = await db.get('following');
cache = cache ? JSON.parse(cache) : {};
if (cache.version !== k_cache_version) {
cache = {
version: k_cache_version,
following: {},
last_row_id: 0,
};
}
let max_row_id = (await query(`
SELECT MAX(rowid) AS max_row_id FROM messages
`, []))[0].max_row_id;
let result = await following_deep_internal(ids, depth, blocking, cache.last_row_id, cache.following, max_row_id);
cache.last_row_id = max_row_id;
let store = JSON.stringify(cache);
await db.set('following', store);
return result;
}
async function fetch_about(db, ids, users) {
const k_cache_version = 1;
let cache = await db.get('about');
cache = cache ? JSON.parse(cache) : {};
if (cache.version !== k_cache_version) {
cache = {
version: k_cache_version,
about: {},
last_row_id: 0,
};
}
let max_row_id = 0;
await ssb.sqlAsync(`
SELECT MAX(rowid) AS max_row_id FROM messages
`,
[],
function(row) {
max_row_id = row.max_row_id;
});
for (let id of Object.keys(cache.about)) {
if (ids.indexOf(id) == -1) {
delete cache.about[id];
}
}
let abouts = [];
await ssb.sqlAsync(
`
SELECT
messages.*
FROM
messages,
json_each(?1) AS following
WHERE
messages.author = following.value AND
messages.rowid > ?3 AND
messages.rowid <= ?4 AND
json_extract(messages.content, '$.type') = 'about'
UNION
SELECT
messages.*
FROM
messages,
json_each(?2) AS following
WHERE
messages.author = following.value AND
messages.rowid <= ?4 AND
json_extract(messages.content, '$.type') = 'about'
ORDER BY messages.author, messages.sequence
`,
[
JSON.stringify(ids.filter(id => cache.about[id])),
JSON.stringify(ids.filter(id => !cache.about[id])),
cache.last_row_id,
max_row_id,
]);
for (let about of abouts) {
let content = JSON.parse(about.content);
if (content.about === about.author) {
delete content.type;
delete content.about;
cache.about[about.author] = Object.assign(cache.about[about.author] || {}, content);
}
}
cache.last_row_id = max_row_id;
await db.set('about', JSON.stringify(cache));
users = users || {};
for (let id of Object.keys(cache.about)) {
users[id] = Object.assign(users[id] || {}, cache.about[id]);
}
return Object.assign({}, users);
} }
async function getAbout(db, id) { async function getAbout(db, id) {
if (g_about_cache[id]) { if (g_about_cache[id]) {
return g_about_cache[id]; return g_about_cache[id];
} }
var o = await db.get(id + ":about"); let o = await db.get(id + ":about");
const k_version = 4; const k_version = 4;
var f = o ? JSON.parse(o) : o; let f = o ? JSON.parse(o) : o;
if (!f || f.version != k_version) { if (!f || f.version != k_version) {
f = {about: {}, sequence: 0, version: k_version}; f = {about: {}, sequence: 0, version: k_version};
} }
@ -87,7 +177,7 @@ async function getAbout(db, id) {
function(row) { function(row) {
f.sequence = row.sequence; f.sequence = row.sequence;
if (row.content) { if (row.content) {
var about = {}; let about = {};
try { try {
about = JSON.parse(row.content); about = JSON.parse(row.content);
} catch { } catch {
@ -97,7 +187,7 @@ async function getAbout(db, id) {
f.about = Object.assign(f.about, about); f.about = Object.assign(f.about, about);
} }
}); });
var j = JSON.stringify(f); let j = JSON.stringify(f);
if (o != j) { if (o != j) {
await db.set(id + ":about", j); await db.set(id + ":about", j);
} }
@ -108,7 +198,7 @@ async function getAbout(db, id) {
async function getSize(db, id) { async function getSize(db, id) {
let size = 0; let size = 0;
await ssb.sqlAsync( await ssb.sqlAsync(
"SELECT (SUM(LENGTH(content)) + SUM(LENGTH(author)) + SUM(LENGTH(id))) AS size FROM messages WHERE author = ?1", "SELECT (LENGTH(author) * COUNT(*) + SUM(LENGTH(content)) + SUM(LENGTH(id))) AS size FROM messages WHERE author = ?1",
[id], [id],
function (row) { function (row) {
size += row.size; size += row.size;
@ -116,6 +206,25 @@ async function getSize(db, id) {
return size; return size;
} }
async function getSizes(ids) {
let sizes = {};
await ssb.sqlAsync(
`
SELECT
author,
(SUM(LENGTH(content)) + SUM(LENGTH(author)) + SUM(LENGTH(messages.id))) AS size
FROM messages
JOIN json_each(?) AS ids ON author = ids.value
GROUP BY author
`,
[JSON.stringify(ids)],
function (row) {
sizes[row.author] = row.size;
});
return sizes;
}
function niceSize(bytes) { function niceSize(bytes) {
let value = bytes; let value = bytes;
let unit = 'B'; let unit = 'B';
@ -131,27 +240,28 @@ function niceSize(bytes) {
return Math.round(value * 10) / 10 + ' ' + unit; return Math.round(value * 10) / 10 + ' ' + unit;
} }
async function buildTree(db, root, indent, depth) { function escape(value) {
var f = await following(db, root); return value.replaceAll('&', '&amp;').replaceAll('<', '&lt;').replaceAll('>', '&gt;');
var result = indent + '[' + f.size + '] ' + '<a target="_top" href="../index/#' + root + '">' + ((await getAbout(db, root)).name || root) + '</a> ' + niceSize(await getSize(db, root)) + '\n';
if (depth > 0) {
for (let next of f) {
result += await buildTree(db, next, indent + ' ', depth - 1);
}
}
return result;
} }
async function main() { async function main() {
await app.setDocument('<pre style="color: #fff">building...</pre>'); await app.setDocument('<pre style="color: #fff">building...</pre>');
var db = await database('ssb'); let db = await database('ssb');
var whoami = await ssb.getIdentities(); let whoami = await ssb.getIdentities();
var tree = ''; let tree = '';
for (let id of whoami) { await app.setDocument(`<pre style="color: #fff">Enumerating followed users...</pre>`);
await app.setDocument(`<pre style="color: #fff">building... ${id}</pre>`); let following = await following_deep(whoami, 2, {});
tree += await buildTree(db, id, '', 2); await app.setDocument(`<pre style="color: #fff">Getting names and sizes...</pre>`);
let [about, sizes] = await Promise.all([
fetch_about(db, following, {}),
getSizes(following),
]);
await app.setDocument(`<pre style="color: #fff">Finishing...</pre>`);
following.sort((a, b) => ((sizes[b] ?? 0) - (sizes[a] ?? 0)));
for (let id of following) {
tree += `<li><a href="/~core/ssb/#${id}">${escape(about[id]?.name ?? id)}</a> ${niceSize(sizes[id] ?? 0)}</li>\n`;
} }
await app.setDocument('<pre style="color: #fff">FOLLOWING:\n' + tree + '</pre>'); await app.setDocument('<!DOCTYPE html>\n<html>\n<body style="color: #fff"><h1>Following</h1>\n<ul>' + tree + '</ul>\n</body>\n</html>');
} }
main(); main();