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POSending websocket data to arbitrary client (based on e.g. username)
 

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  1. POSending websocket data to arbitrary client (based on e.g. username)
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    <p>Is the following possible with websockets:</p> <ul> <li>UserA and UserB are users of a site.</li> <li>UserA logs in to the site and starts up a websocket connection.</li> <li>UserB has a message for UserA, so they submit a form that is handled by some script on the server (doesn't matter if it's through WS, XHR or just a plain form)</li> <li>The server sends the message to UserA through their websocket connection - without the server code just checking the database continually for new messages.</li> </ul> <p>Ideally the script that handles the sending of the message would do everything - put the message into the database and send it to the recipient's websocket connection as well.</p> <p>Edit: here is the actual scenario I have in mind for this kind of functionality:</p> <p>I am developing a chess site which currently uses long-polling for updating the user when their opponent moves, and a few other things like a chat box beneath the board.</p> <p>Here's the PHP script that the user calls to make a move, with code added (near the end) to illustrate what I want to do:</p> <p>/xhr/move.php</p> <pre><code>&lt;?php require_once "base.php"; require_once "Data.php"; require_once "php/livechess/LiveGame.php"; require_once "php/init.php"; $result=false; if($session-&gt;user-&gt;signedin()) { $q=Data::unserialise($_GET["q"]); if(isset($q["gid"]) &amp;&amp; isset($q["fs"]) &amp;&amp; isset($q["ts"])) { $colour=Db::cell(" select colour from seats where user='{$session-&gt;user-&gt;username}' and gid='{$q["gid"]}' and type='".SEAT_TYPE_PLAYER."' "); if($colour!==false) { $promote_to=QUEEN; if(isset($q["promote_to"])) { $promote_to=$q["promote_to"]; } $game=new LiveGame($q["gid"]); if($game-&gt;position-&gt;active===$colour) { if($game-&gt;move($q["fs"], $q["ts"], $promote_to)-&gt;success) { $result=$game-&gt;history-&gt;main_line-&gt;last_move-&gt;mtime; $game-&gt;check_premoves(); $game-&gt;save(); /* here is where the functionality I'm talking to would come in: (some pseudocode for brevity) */ $opponent_username=Db::cell("select user from seats where colour=".opp_colour($colour)." and etc"); send_websocket_data($opponent_username, Data::serialise($game-&gt;history-&gt;main_line-&gt;last_move)); } } } } } echo Data::serialise($result); ?&gt; </code></pre> <p>I have no idea what the implementation of the send_websocket_data function would be like, except that it would take a username and some data to send.</p>
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    1. USGus Hogg-Blake
    1. USGus Hogg-Blake
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    1. COAnything is possible given enough time, money and programmer resources. Do you have a more specific question?
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      1. USRobert Harvey
    2. COI kind of left it bare-bones as I wasn't sure if there was something fundamental to websockets that I had misunderstood I'll edit the question to add more details.
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      1. USGus Hogg-Blake
 

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