Revert "Increase diff limits to 100 KB for collapse and 200 KB overall"

This reverts commit 1d3c33b5.

lib/gitlab/git/diff.rb

@@ -24,41 +24,13 @@ module Gitlab
 
       SERIALIZE_KEYS = %i(diff new_path old_path a_mode b_mode new_file renamed_file deleted_file too_large).freeze
 
-      class << self
-        # The maximum size of a diff to display.
-        def size_limit
-          if RequestStore.active?
-            RequestStore['gitlab_git_diff_size_limit'] ||= find_size_limit
-          else
-            find_size_limit
-          end
-        end
-
-        # The maximum size before a diff is collapsed.
-        def collapse_limit
-          if RequestStore.active?
-            RequestStore['gitlab_git_diff_collapse_limit'] ||= find_collapse_limit
-          else
-            find_collapse_limit
-          end
-        end
+      # The maximum size of a diff to display.
+      SIZE_LIMIT = 100.kilobytes
 
-        def find_size_limit
-          if Feature.enabled?('gitlab_git_diff_size_limit_increase')
-            200.kilobytes
-          else
-            100.kilobytes
-          end
-        end
-
-        def find_collapse_limit
-          if Feature.enabled?('gitlab_git_diff_size_limit_increase')
-            100.kilobytes
-          else
-            10.kilobytes
-          end
-        end
+      # The maximum size before a diff is collapsed.
+      COLLAPSE_LIMIT = 10.kilobytes
 
+      class << self
         def between(repo, head, base, options = {}, *paths)
           straight = options.delete(:straight) || false
 
@@ -172,7 +144,7 @@ module Gitlab
 
       def too_large?
         if @too_large.nil?
-          @too_large = @diff.bytesize >= self.class.size_limit
+          @too_large = @diff.bytesize >= SIZE_LIMIT
         else
           @too_large
         end
@@ -190,7 +162,7 @@ module Gitlab
       def collapsed?
         return @collapsed if defined?(@collapsed)
 
-        @collapsed = !expanded && @diff.bytesize >= self.class.collapse_limit
+        @collapsed = !expanded && @diff.bytesize >= COLLAPSE_LIMIT
       end
 
       def collapse!
@@ -275,14 +247,14 @@ module Gitlab
           hunk.each_line do |line|
             size += line.content.bytesize
 
-            if size >= self.class.size_limit
+            if size >= SIZE_LIMIT
               too_large!
               return true
             end
           end
         end
 
-        if !expanded && size >= self.class.collapse_limit
+        if !expanded && size >= COLLAPSE_LIMIT
           collapse!
           return true
         end

spec/lib/gitlab/git/diff_collection_spec.rb

@@ -341,8 +341,7 @@ describe Gitlab::Git::DiffCollection, seed_helper: true do
     end
 
     context 'when diff is quite large will collapse by default' do
-      let(:iterator) { [{ diff: 'a' * (Gitlab::Git::Diff.collapse_limit + 1) }] }
-      let(:max_files) { 100 }
+      let(:iterator) { [{ diff: 'a' * 20480 }] }
 
       context 'when no collapse is set' do
         let(:expanded) { true }

spec/lib/gitlab/git/diff_spec.rb

@@ -31,36 +31,6 @@ EOT
                                           [".gitmodules"]).patches.first
   end
 
-  describe 'size limit feature toggles' do
-    context 'when the feature gitlab_git_diff_size_limit_increase is enabled' do
-      before do
-        stub_feature_flags(gitlab_git_diff_size_limit_increase: true)
-      end
-
-      it 'returns 200 KB for size_limit' do
-        expect(described_class.size_limit).to eq(200.kilobytes)
-      end
-
-      it 'returns 100 KB for collapse_limit' do
-        expect(described_class.collapse_limit).to eq(100.kilobytes)
-      end
-    end
-
-    context 'when the feature gitlab_git_diff_size_limit_increase is disabled' do
-      before do
-        stub_feature_flags(gitlab_git_diff_size_limit_increase: false)
-      end
-
-      it 'returns 100 KB for size_limit' do
-        expect(described_class.size_limit).to eq(100.kilobytes)
-      end
-
-      it 'returns 10 KB for collapse_limit' do
-        expect(described_class.collapse_limit).to eq(10.kilobytes)
-      end
-    end
-  end
-
   describe '.new' do
     context 'using a Hash' do
       context 'with a small diff' do
@@ -77,7 +47,7 @@ EOT
 
       context 'using a diff that is too large' do
         it 'prunes the diff' do
-          diff = described_class.new(diff: 'a' * (described_class.size_limit + 1))
+          diff = described_class.new(diff: 'a' * 204800)
 
           expect(diff.diff).to be_empty
           expect(diff).to be_too_large
@@ -115,8 +85,8 @@ EOT
           # The patch total size is 200, with lines between 21 and 54.
           # This is a quick-and-dirty way to test this. Ideally, a new patch is
           # added to the test repo with a size that falls between the real limits.
-          allow(Gitlab::Git::Diff).to receive(:size_limit).and_return(150)
-          allow(Gitlab::Git::Diff).to receive(:collapse_limit).and_return(100)
+          stub_const("#{described_class}::SIZE_LIMIT", 150)
+          stub_const("#{described_class}::COLLAPSE_LIMIT", 100)
         end
 
         it 'prunes the diff as a large diff instead of as a collapsed diff' do
@@ -356,7 +326,7 @@ EOT
 
   describe '#collapsed?' do
     it 'returns true for a diff that is quite large' do
-      diff = described_class.new({ diff: 'a' * (described_class.collapse_limit + 1) }, expanded: false)
+      diff = described_class.new({ diff: 'a' * 20480 }, expanded: false)
 
       expect(diff).to be_collapsed
     end