From 9193214274889f2b7636146e72d8200e9bfaeb7b Mon Sep 17 00:00:00 2001
From: Byron Jones <bjones@mozilla.com>
Date: Tue, 4 Mar 2014 15:50:54 +0800
Subject: Bug 966180: backport bug 956233 to bmo (enable USE_MEMCACHE on most
 objects)

---
 Bugzilla/Memcached.pm | 34 ++++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

(limited to 'Bugzilla/Memcached.pm')

diff --git a/Bugzilla/Memcached.pm b/Bugzilla/Memcached.pm
index b1b10311b..4bfca2b65 100644
--- a/Bugzilla/Memcached.pm
+++ b/Bugzilla/Memcached.pm
@@ -14,6 +14,12 @@ use warnings;
 use Bugzilla::Error;
 use Bugzilla::Util qw(trick_taint);
 use Scalar::Util qw(blessed);
+use URI::Escape;
+use Encode;
+use Sys::Syslog qw(:DEFAULT);
+
+# memcached keys have a maximum length of 250 bytes
+use constant MAX_KEY_LENGTH => 250;
 
 sub _new {
     my $invocant = shift;
@@ -26,10 +32,11 @@ sub _new {
         && Bugzilla->params->{memcached_servers})
     {
         require Cache::Memcached;
+        $self->{namespace} = Bugzilla->params->{memcached_namespace} || '';
         $self->{memcached} =
             Cache::Memcached->new({
                 servers   => [ split(/[, ]+/, Bugzilla->params->{memcached_servers}) ],
-                namespace => Bugzilla->params->{memcached_namespace} || '',
+                namespace => $self->{namespace},
             });
     }
     return bless($self, $class);
@@ -129,6 +136,11 @@ sub clear_all {
     if (!$memcached->incr("prefix", 1)) {
         $memcached->add("prefix", time());
     }
+
+    # BMO - log that we've wiped the cache
+    openlog('apache', 'cons,pid', 'local4');
+    syslog('notice', encode_utf8('[memcached] cache cleared'));
+    closelog();
 }
 
 # in order to clear all our keys, we add a prefix to all our keys.  when we
@@ -155,6 +167,14 @@ sub _prefix {
     return $request_cache->{memcached_prefix};
 }
 
+sub _encode_key {
+    my ($self, $key) = @_;
+    $key = $self->_prefix . ':' . uri_escape_utf8($key);
+    return length($self->{namespace} . $key) > MAX_KEY_LENGTH
+        ? undef
+        : $key;
+}
+
 sub _set {
     my ($self, $key, $value) = @_;
     if (blessed($value)) {
@@ -162,13 +182,17 @@ sub _set {
         ThrowCodeError('param_invalid', { function => "Bugzilla::Memcached::set",
                                           param    => "value" });
     }
-    return $self->{memcached}->set($self->_prefix . ':' . $key, $value);
+    $key = $self->_encode_key($key)
+        or return;
+    return $self->{memcached}->set($key, $value);
 }
 
 sub _get {
     my ($self, $key) = @_;
 
-    my $value = $self->{memcached}->get($self->_prefix . ':' . $key);
+    $key = $self->_encode_key($key)
+        or return;
+    my $value = $self->{memcached}->get($key);
     return unless defined $value;
 
     # detaint returned values
@@ -187,7 +211,9 @@ sub _get {
 
 sub _delete {
     my ($self, $key) = @_;
-    return $self->{memcached}->delete($self->_prefix . ':' . $key);
+    $key = $self->_encode_key($key)
+        or return;
+    return $self->{memcached}->delete($key);
 }
 
 1;
-- 
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