Send max_patch_bytes to Gitaly via Gitaly::CommitDiffRequest

We used to apply this limitation on GitLab when using Rugged. Now that
we've shifted to Gitaly, this parameter needs to be sent via a RPC
request. Currently this value is hardcoded on Gitaly.

Gemfile

@@ -423,7 +423,7 @@ group :ed25519 do
 end
 # Gitaly GRPC client
-gem 'gitaly-proto', '~> 0.113.0', require: 'gitaly'
+gem 'gitaly-proto', '~> 0.117.0', require: 'gitaly'
 gem 'grpc', '~> 1.11.0'
 # Locked until https://github.com/google/protobuf/issues/4210 is closed

Gemfile.lock

@@ -276,7 +276,7 @@ GEM
       gettext_i18n_rails (>= 0.7.1)
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
-    gitaly-proto (0.113.0)
+    gitaly-proto (0.117.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.10)
     github-linguist (5.3.3)
@@ -1038,7 +1038,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.3)
-  gitaly-proto (~> 0.113.0)
+  gitaly-proto (~> 0.117.0)
   github-linguist (~> 5.3.3)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-gollum-lib (~> 4.2)

Gemfile.rails5.lock

@@ -279,7 +279,7 @@ GEM
       gettext_i18n_rails (>= 0.7.1)
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
-    gitaly-proto (0.113.0)
+    gitaly-proto (0.117.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.10)
     github-linguist (5.3.3)
@@ -1047,7 +1047,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.3)
-  gitaly-proto (~> 0.113.0)
+  gitaly-proto (~> 0.117.0)
   github-linguist (~> 5.3.3)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-gollum-lib (~> 4.2)

changelogs/unreleased/osw-send-max-patch-bytes-to-gitaly.yml

+---
+title: Send max_patch_bytes to Gitaly via Gitaly::CommitDiffRequest
+merge_request: 21575
+author:
+type: other

lib/gitlab/git/diff_collection.rb

@@ -11,7 +11,7 @@ module Gitlab
       delegate :max_files, :max_lines, :max_bytes, :safe_max_files, :safe_max_lines, :safe_max_bytes, to: :limits
-      def self.collection_limits(options = {})
+      def self.limits(options = {})
         limits = {}
         limits[:max_files] = options.fetch(:max_files, DEFAULT_LIMITS[:max_files])
         limits[:max_lines] = options.fetch(:max_lines, DEFAULT_LIMITS[:max_lines])
@@ -19,13 +19,14 @@ module Gitlab
         limits[:safe_max_files] = [limits[:max_files], DEFAULT_LIMITS[:max_files]].min
         limits[:safe_max_lines] = [limits[:max_lines], DEFAULT_LIMITS[:max_lines]].min
         limits[:safe_max_bytes] = limits[:safe_max_files] * 5.kilobytes # Average 5 KB per file
+        limits[:max_patch_bytes] = Gitlab::Git::Diff::SIZE_LIMIT
         OpenStruct.new(limits)
       end
       def initialize(iterator, options = {})
         @iterator = iterator
-        @limits = self.class.collection_limits(options)
+        @limits = self.class.limits(options)
         @enforce_limits = !!options.fetch(:limits, true)
         @expanded = !!options.fetch(:expanded, true)

lib/gitlab/gitaly_client/commit_service.rb

@@ -369,7 +369,7 @@ module Gitlab
         request_params[:ignore_whitespace_change] = options.fetch(:ignore_whitespace_change, false)
         request_params[:enforce_limits] = options.fetch(:limits, true)
         request_params[:collapse_diffs] = !options.fetch(:expanded, true)
-        request_params.merge!(Gitlab::Git::DiffCollection.collection_limits(options).to_h)
+        request_params.merge!(Gitlab::Git::DiffCollection.limits(options).to_h)
         request = Gitaly::CommitDiffRequest.new(request_params)
         response = GitalyClient.call(@repository.storage, :diff_service, :commit_diff, request, timeout: GitalyClient.medium_timeout)

spec/lib/gitlab/gitaly_client/commit_service_spec.rb

@@ -19,7 +19,14 @@ describe Gitlab::GitalyClient::CommitService do
           right_commit_id: commit.id,
           collapse_diffs: false,
           enforce_limits: true,
-          **Gitlab::Git::DiffCollection.collection_limits.to_h
+          # Tests limitation parameters explicitly
+          max_files: 100,
+          max_lines: 5000,
+          max_bytes: 512000,
+          safe_max_files: 100,
+          safe_max_lines: 5000,
+          safe_max_bytes: 512000,
+          max_patch_bytes: 102400
         )
         expect_any_instance_of(Gitaly::DiffService::Stub).to receive(:commit_diff).with(request, kind_of(Hash))
@@ -37,7 +44,14 @@ describe Gitlab::GitalyClient::CommitService do
           right_commit_id: initial_commit.id,
           collapse_diffs: false,
           enforce_limits: true,
-          **Gitlab::Git::DiffCollection.collection_limits.to_h
+          # Tests limitation parameters explicitly
+          max_files: 100,
+          max_lines: 5000,
+          max_bytes: 512000,
+          safe_max_files: 100,
+          safe_max_lines: 5000,
+          safe_max_bytes: 512000,
+          max_patch_bytes: 102400
         )
         expect_any_instance_of(Gitaly::DiffService::Stub).to receive(:commit_diff).with(request, kind_of(Hash))