Add flock semaphore to prevent race conditions

modules/cjeopardy/cjeopardy.pl

@@ -5,6 +5,7 @@ use strict;
 
 use Time::HiRes qw/gettimeofday/;
 use Time::Duration qw/duration/;
+use Fcntl qw(:flock);
 
 use IRCColors;
 
@@ -25,6 +26,9 @@ if ($channel !~ /^#/) {
   exit;
 }
 
+open my $semaphore, ">", "$CJEOPARDY_DATA-$channel.lock" or die "Couldn't create semaphore lock: $!";
+flock $semaphore, LOCK_EX;
+
 my $ret = open my $fh, "<", "$CJEOPARDY_DATA-$channel";
 if (defined $ret) {
   my $last_question = <$fh>;

modules/cjeopardy/cjeopardy_answer.pl

@@ -5,6 +5,7 @@ use strict;
 
 use Text::Levenshtein qw(fastdistance);
 use Time::HiRes qw(gettimeofday);
+use Fcntl qw(:flock);
 
 use Scorekeeper;
 use IRCColors;
@@ -40,6 +41,9 @@ if (not length $lctext) {
 
 my @data;
 
+open my $semaphore, ">", "$CJEOPARDY_DATA-$channel.lock" or die "Couldn't create semaphore lock: $!";
+flock $semaphore, LOCK_EX;
+
 my $ret = open my $fh, "<", "$CJEOPARDY_LAST_ANSWER-$channel";
 if (defined $ret) {
   my $last_nick = <$fh>;
@@ -186,13 +190,13 @@ foreach my $answer (@valid_answers) {
     }
 
     my %streaks = (
-      3 => "$color{orange}$nick$color{green} is on a $color{orange}3$color{green} correct answer streak!",
-      4 => "$color{orange}$nick$color{green} is hot with a $color{orange}4$color{green} correct answer streak!",
-      5 => "$color{orange}$nick$color{green} is on fire with an $color{orange}5$color{green} correct answer streak!",
-      6 => "$color{orange}$nick$color{green} is ON FIRE with a $color{orange}6$color{green} correct answer streak!",
-      7 => "$color{orange}$nick$color{green} is DOMINATING with a $color{orange}7$color{green} correct answer streak!",
-      8 => "$color{orange}$nick$color{green} is DOMINATING with a $color{orange}8$color{green} correct answer streak!",
-      9 => "$color{orange}$nick$color{green} is DOMINATING with a $color{orange}9$color{green} correct answer streak!",
+      3  => "$color{orange}$nick$color{green} is on a $color{orange}3$color{green} correct answer streak!",
+      4  => "$color{orange}$nick$color{green} is hot with a $color{orange}4$color{green} correct answer streak!",
+      5  => "$color{orange}$nick$color{green} is on fire with a $color{orange}5$color{green} correct answer streak!",
+      6  => "$color{orange}$nick$color{green} is ON FIRE with a $color{orange}6$color{green} correct answer streak!",
+      7  => "$color{orange}$nick$color{green} is DOMINATING with a $color{orange}7$color{green} correct answer streak!",
+      8  => "$color{orange}$nick$color{green} is DOMINATING with an $color{orange}8$color{green} correct answer streak!",
+      9  => "$color{orange}$nick$color{green} is DOMINATING with a $color{orange}9$color{green} correct answer streak!",
       10 => "$color{orange}$nick$color{green} IS UNTOUCHABLE WITH A $color{orange}10$color{green} CORRECT ANSWER STREAK!"
     );
 
@@ -211,6 +215,8 @@ foreach my $answer (@valid_answers) {
     print $fh "$nick\n$data[1]$time\n";
     close $fh;
 
+    close $semaphore;
+
     if ($channel eq '#cjeopardy') {
       my $question = `./cjeopardy.pl $channel`;
       
@@ -254,13 +260,13 @@ if ($player_data->{highest_wrong_streak} > $player_data->{lifetime_highest_wrong
 }
 
 my %streaks = (
-  3 => "$color{red}Try a little bit harder, $color{orange}$nick$color{red}.",
-  4 => "$color{red}Guessing, are we, $color{orange}$nick$color{red}?",
-  5 => "$color{red}Please use better guesses, $color{orange}$nick!",
-  6 => "$color{red}Are you even trying, $color{orange}$nick$color{red}?!",
-  7 => "$color{red}Maybe you should go look it up, $color{orange}$nick$color{red}.",
-  8 => "$color{red}For fuck's sake, go look it up already, $color{orange}$nick$color{red}!",
-  9 => "$color{red}Are you sure you weren't dropped on your head, $color{orange}$nick$color{red}?",
+  3  => "$color{red}Guessing, are we, $color{orange}$nick$color{red}?",
+  4  => "$color{red}Please use better guesses, $color{orange}$nick!",
+  5  => "$color{red}Are you even trying, $color{orange}$nick$color{red}?!",
+  6  => "$color{red}Try a little bit harder, $color{orange}$nick$color{red}.",
+  7  => "$color{red}Maybe you should go look it up, $color{orange}$nick$color{red}.",
+  8  => "$color{red}For fuck's sake, go look it up already, $color{orange}$nick$color{red}!",
+  9  => "$color{red}Are you sure you weren't dropped on your head, $color{orange}$nick$color{red}?",
   10 => "$color{red}Have you been checked for mental retardation yet, $color{orange}$nick$color{red}?"
 );
 

modules/cjeopardy/cjeopardy_hint.pl

@@ -5,6 +5,7 @@ use strict;
 
 use Time::HiRes qw/gettimeofday/;
 use Time::Duration qw/duration/;
+use Fcntl qw(:flock);
 
 use Scorekeeper;
 use IRCColors;
@@ -26,6 +27,9 @@ if ($channel !~ /^#/) {
   exit;
 }
 
+open my $semaphore, ">", "$CJEOPARDY_DATA-$channel.lock" or die "Couldn't create semaphore lock: $!";
+flock $semaphore, LOCK_EX;
+
 my @data;
 open my $fh, "<", "$CJEOPARDY_DATA-$channel" or print "There is no open C Jeopardy question.  Use `cjeopardy` to get a question.\n" and exit;
 @data = <$fh>;