closeChannel method
Closes channel for every subscribed connection, or only for those of
accountId — what revoking access does.
Implementation
void closeChannel(DwLiveChannel channel, {int? accountId}) {
for (final connection in openConnections.toList()) {
if (accountId != null && connection.accountId != accountId) continue;
if (!connection.subscriptions.remove(channel.wireName)) continue;
connection.send(DwChannelClosedMessage(channel.wireName));
}
}