Update mysql allowed_hosts conditional statement

In the origin ceilometer::db::mysql, if the value of $allowed_hosts
contains or equals to $host, then puppet will complain duplicate
declaration error. This patch is aim to update the allowed_hosts
conditonal statement in ceilometer::db::mysql.

There are two cases to pass $allowed_hosts to $real_allowed_hosts:

   - If $allowed_hosts is array,then remove $host from $allowed_hosts;
   - elsif $allowed_hosts is string and not equivalent to $host;

At last, if $real_allowed_hosts is not undef, then run
ceilometer::db::mysql::host_access

Fix bug 1206444

Change-Id: Ib6c33e6a27113d01326bee32c105fea4003059ce

manifests/db/mysql.pp

@@ -46,8 +46,15 @@
     require      => Class['mysql::config'],
   }
 
-  if $allowed_hosts {
-    ceilometer::db::mysql::host_access { $allowed_hosts:
+  # Check allowed_hosts to avoid duplicate resource declarations
+  if is_array($allowed_hosts) and delete($allowed_hosts,$host) != [] {
+    $real_allowed_hosts = delete($allowed_hosts,$host)
+  } elsif is_string($allowed_hosts) and ($allowed_hosts != $host) {
+    $real_allowed_hosts = $allowed_hosts
+  }
+
+  if $real_allowed_hosts {
+    ceilometer::db::mysql::host_access { $real_allowed_hosts:
       user      => $user,
       password  => $password,
       database  => $dbname,

spec/classes/ceilometer_db_mysql_spec.rb

@@ -48,4 +48,63 @@
 
     it_configures 'ceilometer mysql database'
   end
+
+  describe "overriding allowed_hosts param to array" do
+    let :facts do
+      { :osfamily => "Debian" }
+    end
+    let :params do
+      {
+        :password       => 'ceilometerpass',
+        :allowed_hosts  => ['localhost','%']
+      }
+    end
+
+    it {should_not contain_ceilometer__db__mysql__host_access("localhost").with(
+      :user     => 'ceilometer',
+      :password => 'ceilometerpass',
+      :database => 'ceilometer'
+    )}
+    it {should contain_ceilometer__db__mysql__host_access("%").with(
+      :user     => 'ceilometer',
+      :password => 'ceilometerpass',
+      :database => 'ceilometer'
+    )}
+  end
+
+  describe "overriding allowed_hosts param to string" do
+    let :facts do
+      { :osfamily => 'RedHat' }
+    end
+    let :params do
+      {
+        :password       => 'ceilometerpass2',
+        :allowed_hosts  => '192.168.1.1'
+      }
+    end
+
+    it {should contain_ceilometer__db__mysql__host_access("192.168.1.1").with(
+      :user     => 'ceilometer',
+      :password => 'ceilometerpass2',
+      :database => 'ceilometer'
+    )}
+  end
+
+  describe "overriding allowed_hosts param equals to host param " do
+    let :facts do
+      { :osfamily => 'RedHat' }
+    end
+    let :params do
+      {
+        :password       => 'ceilometerpass2',
+        :allowed_hosts  => 'localhost'
+      }
+    end
+
+    it {should_not contain_ceilometer__db__mysql__host_access("localhost").with(
+      :user     => 'ceilometer',
+      :password => 'ceilometerpass2',
+      :database => 'ceilometer'
+    )}
+  end
 end