X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~yarrgweb/git?a=blobdiff_plain;f=yarrg%2Fweb%2Fquery_routesearch;h=8937f285e9f9c77e6f3a77585b5471b6bd3de44e;hb=d892748541adab0a53bbd641a1440f4c65c9cb63;hp=b9b734806968750d406d0f52eb4a5735e3ecbc1b;hpb=30375dc1932be83a48fca8122e81b845c4b0ecc2;p=ypp-sc-tools.db-test.git

diff --git a/yarrg/web/query_routesearch b/yarrg/web/query_routesearch
index b9b7348..8937f28 100644
--- a/yarrg/web/query_routesearch
+++ b/yarrg/web/query_routesearch
@@ -54,6 +54,7 @@ my @islandids;
 
 my $maxmaxdist=35;
 my $maxcpu=90;
+my $concur_lim=5;
 
 my $qa= \%ARGS;
 my $routeparams= { EmsgRef => \$emsg, SayRequiredCapacity => 1 };
@@ -125,7 +126,8 @@ my $isleinfo = sub {
 
 #---------- compute the results ----------
 
-my @rsargs= qw(-DN);
+my @rsargs= ($concur_lim, '-DN');
+my $concur_fail;
 
 foreach my $k (qw(MaxMass MaxVolume MaxCapital)) {
 	my $v= $routeparams->{$k};
@@ -144,8 +146,13 @@ if ($qa->{'debug'}) {
 <%perl>
 }
 
-unshift @rsargs, sourcebasedir().'/yarrg/routesearch',
-	'-d', dbw_filename($qa->{'Ocean'});
+unshift @rsargs,
+	sourcebasedir().'/yarrg/routesearch',
+	'-d', dbw_filename($qa->{'Ocean'}),
+	'-C', webdatadir().'/_concur.', '.lock';
+
+# touch _concur.0{0,1,2,3,4}.lock
+# really chgrp www-data _concur.0?.lock
 
 my %results; # $results{$ap}{"5 6 9 10"} = { stuff }
 
@@ -166,7 +173,12 @@ while (<$fh>) {
 <% $_ |h %>
 <%perl>
 	}
-	next unless m/^ \@ *\d+ ([ap])\# *\d+ \|.*\| *(\d+)lg *\| *\d+ +(\d+) +(\d+) *\| ([0-9 ]+)$/;
+	next unless m/^\s*\@/;
+	if (m/^\@\@\@ concurrency limit exceeded/) {
+		$concur_fail= 1;
+		last;
+	}
+	die unless m/^ \@ *\d+ ([ap])\# *\d+ \|.*\| *(\d+)lg *\| *\d+ +(\d+) +(\d+) *\| ([0-9 ]+)$/;
 	my ($ap,$isles) = (uc $1,$5);
 	next if $results{$ap} && %{$results{$ap}} >= $maxcountea;
 	my $item= { A => $3, P => $4, Leagues => $2 };
@@ -192,12 +204,36 @@ if ($qa->{'debug'}) {
 	print "</pre>\n";
 }
 
+if ($concur_fail) {
+</%perl>
+<h2>Server too busy</h2>
+
+Sorry, but there are already <% $concur_lim |h %> route searches
+running.  We limit the number which can run at once to avoid
+overloading the server system and to make sure that the rest of the
+YARRG website still runs quickly.
+<p>
+
+If you submitted several searches and gave up on them (eg by hitting
+`back' or `stop' in your browser), be aware that that doesn't
+generally stop the search process at the server end.  So it's best to
+avoid asking for large searches that you're not sure about.
+
+<p>
+Otherwise, please try later.  Searches are limited to <% $maxcpu |h %>
+seconds of CPU time so more processing resources should be available soon.
+
+<%perl>
+	return;
+}
+
 </%perl>
 % foreach my $ap (qw(A P)) {
 <h2>ap=<% $ap %></h2>
 <table rules=groups>
 <colgroup span=2>
 <colgroup span=1>
+<colgroup span=1>
 <colgroup span=3>
 <tbody>
 <tr>