Allow pagination for WikiVersions on Gitaly request

Gemfile.lock

@@ -285,7 +285,7 @@ GEM
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
     gherkin-ruby (0.3.2)
-    gitaly-proto (0.73.0)
+    gitaly-proto (0.74.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.0)
     github-linguist (4.7.6)
@@ -1056,7 +1056,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.2.0)
-  gitaly-proto (~> 0.73.0)
+  gitaly-proto (~> 0.74.0)
   github-linguist (~> 4.7.0)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-markup (~> 1.6.2)

lib/gitlab/git/wiki.rb

@@ -93,15 +93,15 @@ module Gitlab
       #  :per_page - The number of items per page.
       #  :limit    - Total number of items to return.
       def page_versions(page_path, options = {})
-        puts '-' * 80
-        puts options
-        puts '-' * 80
-        puts
-
-        byebug
         @repository.gitaly_migrate(:wiki_page_versions) do |is_enabled|
           if is_enabled
-            gitaly_wiki_client.page_versions(page_path, pagination_params(options))
+            versions = gitaly_wiki_client.page_versions(page_path, options)
+
+            # Gitaly uses gollum-lib to get the versions. Gollum defaults to 20
+            # per page, but also fetches 20 if `limit` or `per_page` < 20.
+            # Slicing returns an array with the expected number of items.
+            slice_bound = options[:limit] || options[:per_page] || Gollum::Page.per_page
+            versions[0..slice_bound]
           else
             current_page = gollum_page_by_path(page_path)
 
@@ -136,21 +136,15 @@ module Gitlab
       #  :per_page - The number of items per page.
       #  :limit    - Total number of items to return.
       def commits_from_page(gollum_page, options = {})
-        pagination_options = pagination_params(options)
+        unless options[:limit]
+          options[:offset] = ([1, options.delete(:page).to_i].max - 1) * Gollum::Page.per_page
+          options[:limit] = (options.delete(:per_page) || Gollum::Page.per_page).to_i
+        end
 
         @repository.log(ref: gollum_page.last_version.id,
                         path: gollum_page.path,
-                        limit: pagination_options[:limit],
-                        offset: pagination_options[:offset])
-      end
-
-      def pagination_params(options)
-        return options if options[:limit]
-
-        options = options.dup
-        options[:offset] = ([1, options.delete(:page).to_i].max - 1) * Gollum::Page.per_page
-        options[:limit] = (options.delete(:per_page) || Gollum::Page.per_page).to_i
-        options
+                        limit: options[:limit],
+                        offset: options[:offset])
       end
 
       def gollum_wiki

lib/gitlab/gitaly_client/wiki_service.rb

@@ -108,38 +108,20 @@ module Gitlab
       def page_versions(page_path, options)
         request = Gitaly::WikiGetPageVersionsRequest.new(
           repository: @gitaly_repo,
-          page_path: encode_binary(page_path)
+          page_path: encode_binary(page_path),
+          page: options[:page] || 1,
+          per_page: options[:per_page] || Gollum::Page.per_page
         )
 
-        min_index = options[:offset].to_i
-        max_index = min_index + options[:limit].to_i
-        byebug
-
         stream = GitalyClient.call(@repository.storage, :wiki_service, :wiki_get_page_versions, request)
 
-        version_index = 0
         versions = []
-
-        # Allow limit and offset to be send to Gitaly: TODO
         stream.each do |message|
-          puts '§' * 80
-          puts version_index
-
           message.versions.each do |version|
-            case version_index
-            when min_index...max_index
-              versions << new_wiki_page_version(version)
-            when max_index..Float::INFINITY
-              return versions
-            end
-
-            version_index += 1
-            puts version_index
+            versions << new_wiki_page_version(version)
           end
         end
 
-        # when we're requesting page 99 but the stream doesn't go that far, whatever
-        # is fetched thus far
         versions
       end