Move apps/cory/ => apps/. Going to change import and export to support this.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4163 ed5197a5-7fde-0310-b194-c3ffbd925b24

apps/follow/app.js

@@ -0,0 +1,159 @@
+"use strict";
+
+var g_following_cache = {};
+var g_following_deep_cache = {};
+var g_about_cache = {};
+
+async function following(db, id) {
+	if (g_following_cache[id]) {
+		return g_following_cache[id];
+	}
+	var o = await db.get(id + ":following");
+	const k_version = 5;
+	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.sqlStream(
+		"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, '$.type') = 'contact' "+
+		"UNION SELECT MAX(sequence) AS sequence, NULL, NULL FROM messages WHERE author = ?1 "+
+		"ORDER BY sequence",
+		[id, f.sequence],
+		function(row) {
+			if (row.following) {
+				f.users.add(row.contact);
+			} else {
+				f.users.delete(row.contact);
+			}
+			f.sequence = row.sequence;
+		});
+	var as_set = f.users;
+	f.users = Array.from(f.users).sort();
+	var j = JSON.stringify(f);
+	if (o != j) {
+		await db.set(id + ":following", j);
+	}
+	f.users = as_set;
+	g_following_cache[id] = f.users;
+	return f.users;
+}
+
+async function followingDeep(db, seed_ids, depth) {
+	if (depth <= 0) {
+		return seed_ids;
+	}
+	var key = JSON.stringify([seed_ids, depth]);
+	if (g_following_deep_cache[key]) {
+		return g_following_deep_cache[key];
+	}
+	var f = await Promise.all(seed_ids.map(x => following(db, x).then(x => [...x])));
+	var ids = [].concat(...f);
+	var x = await followingDeep(db, [...new Set(ids)].sort(), depth - 1);
+	x = [...new Set([].concat(...x, ...seed_ids))].sort();
+	g_following_deep_cache[key] = x;
+	return x;
+}
+
+async function getAbout(db, id) {
+	if (g_about_cache[id]) {
+		return g_about_cache[id];
+	}
+	var o = await db.get(id + ":about");
+	const k_version = 4;
+	var f = o ? JSON.parse(o) : o;
+	if (!f || f.version != k_version) {
+		f = {about: {}, sequence: 0, version: k_version};
+	}
+	await ssb.sqlStream(
+		"SELECT "+
+		"  sequence, "+
+		"  content "+
+		"FROM messages "+
+		"WHERE "+
+		"  author = ?1 AND "+
+		"  sequence > ?2 AND "+
+		"  json_extract(content, '$.type') = 'about' AND "+
+		"  json_extract(content, '$.about') = ?1 "+
+		"UNION SELECT MAX(sequence) as sequence, NULL FROM messages WHERE author = ?1 "+
+		"ORDER BY sequence",
+		[id, f.sequence],
+		function(row) {
+			f.sequence = row.sequence;
+			if (row.content) {
+				var about = {};
+				try {
+					about = JSON.parse(row.content);
+				} catch {
+				}
+				delete about.about;
+				delete about.type;
+				f.about = Object.assign(f.about, about);
+			}
+		});
+	var j = JSON.stringify(f);
+	if (o != j) {
+		await db.set(id + ":about", j);
+	}
+	g_about_cache[id] = f.about;
+	return f.about;
+}
+
+async function getSize(db, id) {
+	let size = 0;
+	await ssb.sqlStream(
+		"SELECT (SUM(LENGTH(content)) + SUM(LENGTH(author)) + SUM(LENGTH(id))) AS size FROM messages WHERE author = ?1",
+		[id],
+		function (row) {
+			size += row.size;
+		});
+	return size;
+}
+
+function niceSize(bytes) {
+	let value = bytes;
+	let unit = 'B';
+	const k_units = ['kB', 'MB', 'GB', 'TB'];
+	for (let u of k_units) {
+		if (value >= 1024) {
+			value /= 1024;
+			unit = u;
+		} else {
+			break;
+		}
+	}
+	return Math.round(value * 10) / 10 + ' ' + unit;
+}
+
+async function buildTree(db, root, indent, depth) {
+	var f = await following(db, root);
+	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() {
+	await app.setDocument('<pre style="color: #fff">building...</pre>');
+	var db = await database('ssb');
+	var whoami = await ssb.getIdentities();
+	var tree = '';
+	for (let id of whoami) {
+		await app.setDocument(`<pre style="color: #fff">building... ${id}</pre>`);
+		tree += await buildTree(db, id, '', 2);
+	}
+	await app.setDocument('<pre style="color: #fff">FOLLOWING:\n' + tree + '</pre>');
+}
+
+main();