From 66df366268c4e5b17c9235b5a0c3aabcbd578e01 Mon Sep 17 00:00:00 2001
From: Godfrey Chan <godfreykfc@gmail.com>
Date: Wed, 11 Apr 2018 22:54:20 -0700
Subject: Fix `ActiveSupport::Cache` compression

(See previous commit for a description of the issue)
---
 activesupport/lib/active_support/cache.rb | 67 +++++++++++++++----------------
 1 file changed, 32 insertions(+), 35 deletions(-)

(limited to 'activesupport/lib')

diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index 6967c164ab..d06a4971db 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -712,17 +712,14 @@ module ActiveSupport
       DEFAULT_COMPRESS_LIMIT = 1.kilobyte
 
       # Creates a new cache entry for the specified value. Options supported are
-      # +:compress+, +:compress_threshold+, and +:expires_in+.
-      def initialize(value, options = {})
-        @value = value
-        if should_compress?(options)
-          compress!
-        end
-
-        @version    = options[:version]
+      # +:compress+, +:compress_threshold+, +:version+ and +:expires_in+.
+      def initialize(value, compress: true, compress_threshold: DEFAULT_COMPRESS_LIMIT, version: nil, expires_in: nil, **)
+        @value      = value
+        @version    = version
         @created_at = Time.now.to_f
-        @expires_in = options[:expires_in]
-        @expires_in = @expires_in.to_f if @expires_in
+        @expires_in = expires_in && expires_in.to_f
+
+        compress!(compress_threshold) if compress
       end
 
       def value
@@ -754,17 +751,13 @@ module ActiveSupport
       # Returns the size of the cached value. This could be less than
       # <tt>value.size</tt> if the data is compressed.
       def size
-        if defined?(@s)
-          @s
+        case value
+        when NilClass
+          0
+        when String
+          @value.bytesize
         else
-          case value
-          when NilClass
-            0
-          when String
-            @value.bytesize
-          else
-            @s = Marshal.dump(@value).bytesize
-          end
+          @s ||= Marshal.dump(@value).bytesize
         end
       end
 
@@ -781,31 +774,35 @@ module ActiveSupport
       end
 
       private
-        def should_compress?(options)
-          if @value && options.fetch(:compress, true)
-            compress_threshold = options.fetch(:compress_threshold, DEFAULT_COMPRESS_LIMIT)
-            serialized_value_size = (@value.is_a?(String) ? @value : marshaled_value).bytesize
+        def compress!(compress_threshold)
+          case @value
+          when nil, true, false, Numeric
+            uncompressed_size = 0
+          when String
+            uncompressed_size = @value.bytesize
+          else
+            serialized = Marshal.dump(@value)
+            uncompressed_size = serialized.bytesize
+          end
+
+          if uncompressed_size >= compress_threshold
+            serialized ||= Marshal.dump(@value)
+            compressed = Zlib::Deflate.deflate(serialized)
 
-            serialized_value_size >= compress_threshold
+            if compressed.bytesize < uncompressed_size
+              @value = compressed
+              @compressed = true
+            end
           end
         end
 
         def compressed?
-          defined?(@compressed) ? @compressed : false
-        end
-
-        def compress!
-          @value = Zlib::Deflate.deflate(marshaled_value)
-          @compressed = true
+          defined?(@compressed)
         end
 
         def uncompress(value)
           Marshal.load(Zlib::Inflate.inflate(value))
         end
-
-        def marshaled_value
-          @marshaled_value ||= Marshal.dump(@value)
-        end
     end
   end
 end
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