var json_contents_gz = undefined;
var json_last_modified = undefined;
-// The list of clients that are waiting for new data to show up,
-// and their associated timers. Uniquely keyed by request_id
-// so that we can take them out of the queue if they time out.
+// The list of clients that are waiting for new data to show up.
+// Uniquely keyed by request_id so that we can take them out of
+// the queue if they close the socket.
var sleeping_clients = {};
var request_id = 0;
// Used to show a viewer count to the user.
var last_seen_clients = {};
+// The timer used to touch the file every 30 seconds if nobody
+// else does it for us. This makes sure we don't have clients
+// hanging indefinitely (which might have them return errors).
+var touch_timer = undefined;
+
+// If we are behind Varnish, we can't count the number of clients
+// ourselves, so some external log-tailing daemon needs to tell us.
+var viewer_count_override = undefined;
+
var reread_file = function(event, filename) {
if (filename != path.basename(json_filename)) {
return;
});
});
});
+
+ if (touch_timer !== undefined) {
+ clearTimeout(touch_timer);
+ }
+ touch_timer = setTimeout(function() {
+ console.log("Touching analysis.json due to no other activity");
+ var now = Date.now() / 1000;
+ fs.utimes(json_filename, now, now);
+ }, 30000);
}
var possibly_wakeup_clients = function() {
var num_viewers = count_viewers();
for (var i in sleeping_clients) {
- clearTimeout(sleeping_clients[i].timer);
mark_recently_seen(sleeping_clients[i].unique);
send_json(sleeping_clients[i].response,
sleeping_clients[i].accept_gzip,
response.write('Something went wrong. Sorry.');
response.end();
}
+var handle_viewer_override = function(request, u, response) {
+ // Only accept requests from localhost.
+ var peer = request.socket.localAddress;
+ if ((peer != '127.0.0.1' && peer != '::1') || request.headers['x-forwarded-for']) {
+ console.log("Refusing viewer override from " + peer);
+ send_404(response);
+ } else {
+ viewer_count_override = (u.query)['num'];
+ response.writeHead(200, {
+ 'Content-Type': 'text/plain',
+ });
+ response.write('OK.');
+ response.end();
+ }
+}
var send_json = function(response, accept_gzip, num_viewers) {
var headers = {
'Content-Type': 'text/json',
'Access-Control-Allow-Origin': 'http://analysis.sesse.net',
'Access-Control-Expose-Headers': 'X-Remoteglot-Last-Modified, X-Remoteglot-Num-Viewers',
'Expires': 'Mon, 01 Jan 1970 00:00:00 UTC',
+ 'Vary': 'Accept-Encoding',
};
if (accept_gzip) {
}
response.end();
}
-var timeout_client = function(client) {
- mark_recently_seen(client.unique);
- send_json(client.response, client.accept_gzip, count_viewers());
- delete sleeping_clients[client.request_id];
-}
var mark_recently_seen = function(unique) {
if (unique) {
last_seen_clients[unique] = (new Date).getTime();
}
}
var count_viewers = function() {
+ if (viewer_count_override !== undefined) {
+ return viewer_count_override;
+ }
+
var now = (new Date).getTime();
// Go through and remove old viewers, and count them at the same time.
var unique = (u.query)['unique'];
console.log((new Date).getTime()*1e-3 + " " + request.url);
-
+ if (u.pathname === '/override-num-viewers') {
+ handle_viewer_override(request, u, response);
+ return;
+ }
if (u.pathname !== '/analysis.pl') {
// This is not the request you are looking for.
send_404(response);
}
// OK, so we need to hang until we have something newer.
- // Put the user on the wait list; if we don't get anything
- // in 30 seconds, though, we'll send something anyway.
+ // Put the user on the wait list.
var client = {};
client.response = response;
- client.timer = setTimeout(function() { timeout_client(client); }, 30000);
client.request_id = request_id;
client.accept_gzip = accept_gzip;
client.unique = unique;