Mute log info coming from the local_cache strategy

activesupport/lib/active_support/cache.rb

@@ -115,6 +115,13 @@ module ActiveSupport
         self
       end
 
+      def mute
+        previous_silence, @silence = defined?(@silence) && @silence, true
+        yield
+      ensure
+        @silence = previous_silence
+      end
+
       # Fetches data from the cache, using the given key. If there is data in
       # the cache with the given key, then that data is returned.
       #

activesupport/lib/active_support/cache/memory_store.rb

@@ -1,3 +1,5 @@
+require 'active_support/core_ext/object/duplicable'
+
 module ActiveSupport
   module Cache
     # A cache store implementation which stores everything into memory in the

activesupport/lib/active_support/cache/strategy/local_cache.rb

@@ -44,7 +44,7 @@ module ActiveSupport
             nil
           elsif value.nil?
             value = super
-            local_cache.write(key, value || NULL) if local_cache
+            local_cache.mute { local_cache.write(key, value || NULL) } if local_cache
             value.duplicable? ? value.dup : value
           else
             # forcing the value to be immutable
@@ -54,12 +54,12 @@ module ActiveSupport
 
         def write(key, value, options = nil)
           value = value.to_s if respond_to?(:raw?) && raw?(options)
-          local_cache.write(key, value || NULL) if local_cache
+          local_cache.mute { local_cache.write(key, value || NULL) } if local_cache
           super
         end
 
         def delete(key, options = nil)
-          local_cache.write(key, NULL) if local_cache
+          local_cache.mute { local_cache.write(key, NULL) } if local_cache
           super
         end
 
@@ -76,7 +76,7 @@ module ActiveSupport
 
         def increment(key, amount = 1)
           if value = super
-            local_cache.write(key, value.to_s) if local_cache
+            local_cache.mute { local_cache.write(key, value.to_s) } if local_cache
             value
           else
             nil
@@ -85,7 +85,7 @@ module ActiveSupport
 
         def decrement(key, amount = 1)
           if value = super
-            local_cache.write(key, value.to_s) if local_cache
+            local_cache.mute { local_cache.write(key, value.to_s) } if local_cache
             value
           else
             nil

activesupport/test/caching_test.rb

@@ -342,3 +342,22 @@ uses_memcached 'memcached backed store' do
     include CacheStoreBehavior
   end
 end
+
+class CacheStoreLoggerTest < ActiveSupport::TestCase
+  def setup
+    @cache = ActiveSupport::Cache.lookup_store(:memory_store)
+
+    @buffer = StringIO.new
+    @cache.logger = Logger.new(@buffer)
+  end
+
+  def test_logging
+    @cache.fetch('foo') { 'bar' }
+    assert @buffer.string.present?
+  end
+
+  def test_mute_logging
+    @cache.mute { @cache.fetch('foo') { 'bar' } }
+    assert @buffer.string.blank?
+  end
+end