def command(db, channel, command, *args):
<EOL>cmd = [command]<EOL>cmd.extend(str(a) for a in args)<EOL>db.publish(channel, '<STR_LIT::>'.join(cmd))<EOL>
Utility function to issue a command to all Turnstile instances.

:param db: The database handle.
:param channel: The control channel all Turnstile instances are
                listening on.
:param command: The command, as plain text.  Currently, only
                'reload' and 'ping' are recognized.

All remaining arguments are treated as arguments for the command;
they will be stringified and sent along with the command to the
control channel.  Note that ':' is an illegal character in
arguments, but no warnings will be issued if it is used.