Per-guild presence sync settings

On by default for existing and small guilds.
Off for new large guilds.
Can be toggled either way.

src/d2m/actions/create-space.js

@@ -31,6 +31,8 @@ async function createSpace(guild, kstate) {
 	const topic = kstate["m.room.topic/"]?.topic || undefined
 	assert(name)
 
+	const memberCount = guild["member_count"] ?? guild.approximate_member_count ?? 0
+	const enablePresenceByDefault = +(memberCount < 150) // could increase this later on if it doesn't cause any problems
 	const globalAdmins = select("member_power", "mxid", {room_id: "*"}).pluck().all()
 
 	const roomID = await createRoom.postApplyPowerLevels(kstate, async kstate => {
@@ -50,7 +52,7 @@ async function createSpace(guild, kstate) {
 			initial_state: await ks.kstateToState(kstate)
 		})
 	})
-	db.prepare("INSERT INTO guild_space (guild_id, space_id) VALUES (?, ?)").run(guild.id, roomID)
+	db.prepare("INSERT INTO guild_space (guild_id, space_id, presence) VALUES (?, ?, ?)").run(guild.id, roomID, enablePresenceByDefault)
 	return roomID
 }
 

src/d2m/actions/set-presence.js

@@ -11,11 +11,22 @@ const presenceDelay = 1500
 /** @type {Map<string, NodeJS.Timeout>} user ID -> cancelable timeout */
 const presenceDelayMap = new Map()
 
+// Access the list of enabled guilds as needed rather than like multiple times per second when a user changes presence
+/** @type {Set<string>} */
+let presenceEnabledGuilds
+function checkPresenceEnabledGuilds() {
+	presenceEnabledGuilds = new Set(select("guild_space", "guild_id", {presence: 1}).pluck().all())
+}
+checkPresenceEnabledGuilds()
+
 /**
  * @param {string} userID Discord user ID
+ * @param {string} guildID Discord guild ID that this presence applies to (really, the same presence applies to every single guild, but is delivered separately)
  * @param {string} status status field from Discord's PRESENCE_UPDATE event
  */
-function setPresence(userID, status) {
+function setPresence(userID, guildID, status) {
+	// check if we care about this guild
+	if (!presenceEnabledGuilds.has(guildID)) return
 	// cancel existing timer if one is already set
 	if (presenceDelayMap.has(userID)) {
 		clearTimeout(presenceDelayMap.get(userID))
@@ -43,3 +54,4 @@ function setPresenceCallback(user_id, status) {
 }
 
 module.exports.setPresence = setPresence
+module.exports.checkPresenceEnabledGuilds = checkPresenceEnabledGuilds