Update gRPC v1.30.2 and google-protobuf to 3.12.4

This will help unblock Ruby 2.7 support. We previously had to revert
these due to CentOS 6 build issues, but with
https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/4466 we
are able to work around the compiler limitations.

The upgrade in google-protobuf from v3.8 to v3.9 had a breaking change:
https://github.com/protocolbuffers/protobuf/pull/6166. As
https://apidock.com/rails/Object/as_json mentions, Rails' `as_json` uses
`to_hash`, which no longer exists. Now we need to coerce values to
`to_h` to retain the original behavior.

Gemfile

@@ -464,9 +464,9 @@ end
 # Gitaly GRPC protocol definitions
 gem 'gitaly', '~> 13.3.0-rc1'
 
-gem 'grpc', '~> 1.24.0'
+gem 'grpc', '~> 1.30.2'
 
-gem 'google-protobuf', '~> 3.8.0'
+gem 'google-protobuf', '~> 3.12'
 
 gem 'toml-rb', '~> 1.0.0'
 

Gemfile.lock

@@ -450,9 +450,9 @@ GEM
       representable (~> 3.0)
       retriable (>= 2.0, < 4.0)
       signet (~> 0.12)
-    google-protobuf (3.8.0)
-    googleapis-common-protos-types (1.0.4)
-      google-protobuf (~> 3.0)
+    google-protobuf (3.12.4)
+    googleapis-common-protos-types (1.0.5)
+      google-protobuf (~> 3.11)
     googleauth (0.12.0)
       faraday (>= 0.17.3, < 2.0)
       jwt (>= 1.4, < 3.0)
@@ -491,8 +491,8 @@ GEM
       graphql (~> 1.6)
       html-pipeline (~> 2.8)
       sass (~> 3.4)
-    grpc (1.24.0)
-      google-protobuf (~> 3.8)
+    grpc (1.30.2)
+      google-protobuf (~> 3.12)
       googleapis-common-protos-types (~> 1.0)
     gssapi (1.2.0)
       ffi (>= 1.0.1)
@@ -1278,7 +1278,7 @@ DEPENDENCIES
   gitlab_omniauth-ldap (~> 2.1.1)
   gon (~> 6.2)
   google-api-client (~> 0.33)
-  google-protobuf (~> 3.8.0)
+  google-protobuf (~> 3.12)
   gpgme (~> 2.0.19)
   grape (= 1.4.0)
   grape-entity (~> 0.7.1)
@@ -1287,7 +1287,7 @@ DEPENDENCIES
   graphiql-rails (~> 1.4.10)
   graphql (~> 1.10.5)
   graphql-docs (~> 1.6.0)
-  grpc (~> 1.24.0)
+  grpc (~> 1.30.2)
   gssapi
   guard-rspec
   haml_lint (~> 0.34.0)

ee/spec/services/merge_trains/create_pipeline_service_spec.rb

@@ -30,7 +30,7 @@ RSpec.describe MergeTrains::CreatePipelineService do
 
       specify do
         expect(subject[:status]).to eq(:error)
-        expect(subject[:message]).to eq(expected_reason)
+        expect(subject[:message]).to match(/^#{expected_reason}/)
       end
     end
 

lib/api/helpers/internal_helpers.rb

@@ -117,7 +117,7 @@ module API
         return unless %w[git-receive-pack git-upload-pack git-upload-archive].include?(action)
 
         {
-          repository: repository.gitaly_repository,
+          repository: repository.gitaly_repository.to_h,
           address: Gitlab::GitalyClient.address(repository.shard),
           token: Gitlab::GitalyClient.token(repository.shard),
           features: Feature::Gitaly.server_feature_flags

lib/gitlab/diff/stats_cache.rb

@@ -29,7 +29,7 @@ module Gitlab
         return if cache.exist?(key)
         return unless stats
 
-        cache.write(key, stats.as_json, expires_in: EXPIRATION)
+        cache.write(key, stats.map(&:to_h).as_json, expires_in: EXPIRATION)
         clear_memoization(:cached_values)
       end
 

spec/graphql/mutations/commits/create_spec.rb

@@ -147,7 +147,7 @@ RSpec.describe Mutations::Commits::Create do
 
         it 'returns errors' do
           expect(mutated_commit).to be_nil
-          expect(subject[:errors]).to eq(['3:UserCommitFiles: empty CommitMessage'])
+          expect(subject[:errors].to_s).to match(/3:UserCommitFiles: empty CommitMessage/)
         end
       end
 

spec/lib/gitlab/diff/stats_cache_spec.rb

@@ -9,6 +9,7 @@ RSpec.describe Gitlab::Diff::StatsCache, :use_clean_rails_memory_store_caching d
   let(:cachable_key) { 'cachecachecache' }
   let(:stat) { Gitaly::DiffStats.new(path: 'temp', additions: 10, deletions: 15) }
   let(:stats) { Gitlab::Git::DiffStatsCollection.new([stat]) }
+  let(:serialized_stats) { stats.map(&:to_h).as_json }
   let(:cache) { Rails.cache }
 
   describe '#read' do
@@ -38,7 +39,7 @@ RSpec.describe Gitlab::Diff::StatsCache, :use_clean_rails_memory_store_caching d
       it 'writes the stats' do
         expect(cache)
           .to receive(:write)
-          .with(key, stats.as_json, expires_in: described_class::EXPIRATION)
+          .with(key, serialized_stats, expires_in: described_class::EXPIRATION)
           .and_call_original
 
         stats_cache.write_if_empty(stats)
@@ -53,7 +54,7 @@ RSpec.describe Gitlab::Diff::StatsCache, :use_clean_rails_memory_store_caching d
         it 'writes the stats' do
           expect(cache)
             .to receive(:write)
-            .with(key, stats.as_json, expires_in: described_class::EXPIRATION)
+            .with(key, serialized_stats, expires_in: described_class::EXPIRATION)
             .and_call_original
 
           stats_cache.write_if_empty(stats)