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connections.js
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connections.js
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var activeConnections = module.exports.activeConnections = { };
var ping = module.exports.ping = function ping(ws){
ws.send(JSON.stringify({ type: 'ping' }));
}
var pingAll = module.exports.pingAll = function pingAll(){
var any = false;
for(var userID in activeConnections){
any = true;
for(var sessionID in activeConnections[userID]){
ping(activeConnections[userID][sessionID]);
}
}
if(any) setTimeout(pingCheck, 5000);
}
var schedulePings = module.exports.schedulePings = function schedulePings(interval){
setTimeout(() => {
pingAll();
schedulePings(interval);
}, interval);
}
var closeActiveConnection = module.exports.closeActiveConnection = function closeActiveConnection(session){
if(activeConnections[session.userID]){
var ws = activeConnections[session.userID][session.id];
if(ws){ // Close, then remove any existing connection for this session.
ws.close();
delete activeConnections[session.userID][session.id];
}
}
}
var activeConnectionCount = module.exports.activeConnectionCount = function activeConnectionCount(userID){
var userConnections = activeConnections[userID];
if(userConnections) return Object.keys(userConnections).length;
else return 0;
}
var broadcastActiveConnectionCount = module.exports.broadcastActiveConnectionCount = function broadcastActiveConnectionCount(userID){
var count = activeConnectionCount(userID);
var userConnections = activeConnections[userID];
if(userConnections){
for(var sessionID in userConnections){
userConnections[sessionID].send(JSON.stringify({ type: 'connectionCount', count: count }));
}
}
}
var pingCheckForUser = module.exports.pingCheckForUser = function pingCheckForUser(userID){
var userConnections = activeConnections[userID];
if(userConnections){
var changed = false;
for(var sessionID in userConnections){
var ws = userConnections[sessionID];
if(Date.now() - ws.lastCommunicationTime > 5500){ // 5.5 seconds
closeActiveConnection(sessionID);
changed = true;
}
}
if(changed){
broadcastActiveConnectionCount(userID);
}
}
}
var pingCheck = module.exports.pingCheck = function pingCheck(){
for(var userID in activeConnections){
pingCheckForUser(userID);
}
}
var pingAllForUser = module.exports.pingAllForUser = function pingAllForUser(userID, currentSessionID){
var userConnections = activeConnections[userID];
if(userConnections){
for(var sessionID in userConnections){
if(sessionID != currentSessionID){
ping(userConnections[sessionID]);
}
}
setTimeout(() => pingCheckForUser(userID), 5000);
}
}
var getActiveConnection = module.exports.getActiveConnection = function getActiveConnection(session){
if(activeConnections[session.userID]){ // Check whether this user has any active connections...
return activeConnections[session.userID][session.id]; // ...for this session.
}
else return null;
}