First go at implementing rooms. A test passes that appears to exercise them.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4017 ed5197a5-7fde-0310-b194-c3ffbd925b24

core/ssb.js

@@ -1,6 +1,7 @@
 "use strict";
 var g_wants_requests = {};
 var g_database = new Database('core');
+let g_attendants = {};
 const k_use_create_history_stream = false;
 const k_blobs_concurrent_target = 8;
 
@@ -72,7 +73,28 @@ function storeMessage(message) {
 	}
 }
 
-ssb.addEventListener('connections', function(change, connection) {
+function tunnel_attendants(request) {
+	if (request.message.type !== 'state') {
+		throw Error('Unexpected type: ' + request.message.type);
+	}
+	let state = new Set(request.message.ids);
+	for (let id of state) {
+		request.add_room_attendant(id);
+	}
+	request.more(function attendants(message) {
+		if (message.message.type === 'joined') {
+			request.add_room_attendant(message.message.id);
+			state.add(message.message.id);
+		} else if (message.message.type === 'left') {
+			request.remove_room_attendant(message.message.id);
+			state.delete(message.message.id);
+		} else {
+			throw Error('Unexpected type: ' + message.type);
+		}
+	});
+}
+
+ssb.addEventListener('connections', function on_connections_changed(change, connection) {
 	if (change == 'add') {
 		var sequence = get_latest_sequence_for_author(connection.id);
 		if (k_use_create_history_stream) {
@@ -89,12 +111,17 @@ ssb.addEventListener('connections', function(change, connection) {
 			});
 		} else {
 			if (connection.is_client) {
+				connection.send_json({'name': ['tunnel', 'isRoom'], 'args': [], 'type': 'source'}, function tunnel_is_room(request) {
+					if (request.message) {
+						connection.send_json({'name': ['room', 'attendants'], 'args': [], 'type': 'source'}, tunnel_attendants);
+					}
+				});
 				connection.send_json({"name": ["ebt", "replicate"], "args": [{"version": 3, "format": "classic"}], "type": "duplex"}, ebtReplicateClient);
 			}
 		}
 
 		connection.active_blob_wants = {};
-		connection.send_json({'name': ['blobs', 'createWants'], 'type': 'source', 'args': []}, function(message) {
+		connection.send_json({'name': ['blobs', 'createWants'], 'type': 'source', 'args': []}, function on_blob_create_wants(message) {
 			Object.keys(message.message).forEach(function(id) {
 				if (message.message[id] < 0) {
 					if (g_wants_requests[connection.id]) {
@@ -129,6 +156,8 @@ ssb.addEventListener('connections', function(change, connection) {
 		});
 	} else if (change == 'remove') {
 		print('REMOVE', connection.id);
+		notify_attendant_changed(connection.id, 'left');
+		delete g_attendants[connection.id];
 		delete g_wants_requests[connection.id];
 	} else {
 		print('CHANGE', change);
@@ -191,13 +220,59 @@ ssb.addRpc(['blobs', 'get'], function(request) {
 });
 
 ssb.addRpc(['gossip', 'ping'], function(request) {
-	request.more(function(message) {
+	request.more(function ping(message) {
 		message.send_json(Date.now());
 	});
 });
 
 ssb.addRpc(['tunnel', 'isRoom'], function(request) {
-	request.send_json(false);
+	request.send_json(true);
+});
+
+function notify_attendant_changed(id, type) {
+	for (let r of Object.values(g_attendants)) {
+		try {
+			r.send_json({
+				type: type,
+				id: id,
+			});
+		} catch (e) {
+			print(`Removing ${r.connection.id} from g_attendants in ${type}.`, e);
+			delete g_attendants[r.connection.id];
+		}
+	}
+}
+
+ssb.addRpc(['room', 'attendants'], function(request) {
+	let ids = Object.keys(g_attendants).sort();
+	request.send_json({
+		type: 'state',
+		ids: ids,
+	});
+	notify_attendant_changed(request.connection.id, 'joined');
+	g_attendants[request.connection.id] = request;
+});
+
+ssb.addRpc(['tunnel', 'connect'], function(request) {
+	if (!request.args[0].origin &&
+		request.args[0].portal &&
+		request.args[0].target) {
+		let target_connection = ssb.getConnection(request.args[0].target);
+		let target_request_number = target_connection.send_json({
+			'name': ['tunnel', 'connect'],
+			'args': [{
+				'origin': request.connection.id,
+				'portal': request.args[0].portal,
+				'target': request.args[0].target,
+			}],
+			'type': 'duplex',
+		});
+		ssb.tunnel(request.connection, -request.request_number, target_connection, target_request_number);
+	} else if (request.args[0].origin &&
+		request.args[0].portal &&
+		request.args[0].target) {
+		ssb.createTunnel(request.connection, -request.request_number, request.args[0].origin);
+	}
 });
 
 function ebtReplicateSendClock(request, have) {