Gitaly Server info for admin panel

Implements the client side for gitlab-org/gitaly#819. Which is a server
info command. This checks the server version and git binairy version on
the server.

A small UI was added for administrators, so they can check the status of
the Gitaly server. This is done for each storage the monolith knows.

Because of this commit, gitlab-org/gitlab-ce!15580 is now closed. That
MR removed the Git version too, but didn't replace it with anything.

GITALY_SERVER_VERSION

-0.74.0
+0.76.0

Gemfile

@@ -406,7 +406,7 @@ group :ed25519 do
 end
 # Gitaly GRPC client
-gem 'gitaly-proto', '~> 0.78.0', require: 'gitaly'
+gem 'gitaly-proto', '~> 0.83.0', require: 'gitaly'
 gem 'toml-rb', '~> 0.3.15', require: false

Gemfile.lock

@@ -285,7 +285,7 @@ GEM
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
     gherkin-ruby (0.3.2)
-    gitaly-proto (0.78.0)
+    gitaly-proto (0.83.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.0)
     github-linguist (4.7.6)
@@ -340,7 +340,7 @@ GEM
       mime-types (~> 3.0)
       representable (~> 3.0)
       retriable (>= 2.0, < 4.0)
-    google-protobuf (3.4.1.1)
+    google-protobuf (3.5.1.1-universal-darwin)
     googleapis-common-protos-types (1.0.1)
       google-protobuf (~> 3.0)
     googleauth (0.5.3)
@@ -369,7 +369,7 @@ GEM
       rake
     grape_logging (1.7.0)
       grape
-    grpc (1.8.3)
+    grpc (1.8.3-universal-darwin)
       google-protobuf (~> 3.1)
       googleapis-common-protos-types (~> 1.0.0)
       googleauth (>= 0.5.1, < 0.7)
@@ -1056,7 +1056,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.2.0)
-  gitaly-proto (~> 0.78.0)
+  gitaly-proto (~> 0.83.0)
   github-linguist (~> 4.7.0)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-markup (~> 1.6.2)

app/controllers/admin/gitaly_servers_controller.rb

+class Admin::GitalyServersController < Admin::ApplicationController
+  def index
+    @gitaly_servers = Gitaly::Server.all
+  end
+end

app/views/admin/dashboard/index.html.haml

@@ -138,19 +138,11 @@
               GitLab API
               %span.pull-right
                 = API::API::version
-            %p
-              Gitaly
-              %span.pull-right
-                = Gitlab::GitalyClient.expected_server_version
             - if Gitlab.config.pages.enabled
               %p
                 GitLab Pages
                 %span.pull-right
                   = Gitlab::Pages::VERSION
-            %p
-              Git
-              %span.pull-right
-                = Gitlab::Git.version
             %p
               Ruby
               %span.pull-right
@@ -163,6 +155,8 @@
               = Gitlab::Database.adapter_name
               %span.pull-right
                 = Gitlab::Database.version
+            %p
+              = link_to "Gitaly Servers", admin_gitaly_servers_path
     .row
       .col-md-4
         .info-well

app/views/admin/gitaly_servers/index.html.haml

+- breadcrumb_title _("Gitaly Servers")
+
+%h3.page-title= _("Gitaly Servers")
+%hr
+.gitaly_servers
+  - if @gitaly_servers.any?
+    .table-holder
+      %table.table.responsive-table
+        %thead.hidden-sm.hidden-xs
+          %tr
+            %th= _("Storage")
+            %th= n_("Gitaly|Address")
+            %th= _("Server version")
+            %th= _("Git version")
+            %th= _("Up to date")
+        - @gitaly_servers.each do |server|
+          %tr
+            %td
+              = server.storage
+            %td
+              = server.address
+            %td
+              = server.server_version
+            %td
+              = server.git_binary_version
+            %td
+              = boolean_to_icon(server.up_to_date?)
+  - else
+    .empty-state
+      .text-center
+        %h4= _("No connection could be made to a Gitaly Server, please check your logs!")

changelogs/unreleased/zj-gitaly-server-info.yml

+---
+title: Add Gitaly Servers admin dashboard
+merge_request:
+author:
+type: added

config/routes/admin.rb

@@ -24,6 +24,8 @@ namespace :admin do
   resource :impersonation, only: :destroy
   resources :abuse_reports, only: [:index, :destroy]
+  resources :gitaly_servers, only: [:index]
+
   resources :spam_logs, only: [:index, :destroy] do
     member do
       post :mark_as_ham

lib/gitaly/server.rb

+module Gitaly
+  class Server
+    def self.all
+      Gitlab.config.repositories.storages.keys.map { |s| Gitaly::Server.new(s) }
+    end
+
+    attr_reader :storage
+
+    def initialize(storage)
+      @storage = storage
+    end
+
+    def server_version
+      info.server_version
+    end
+
+    def git_binary_version
+      info.git_version
+    end
+
+    def up_to_date?
+      server_version == Gitlab::GitalyClient.expected_server_version
+    end
+
+    def address
+      Gitlab::GitalyClient.address(@storage)
+    rescue RuntimeError => e
+      "Error getting the address: #{e.message}"
+    end
+
+    private
+
+    def info
+      @info ||=
+        begin
+          Gitlab::GitalyClient::ServerService.new(@storage).info
+        rescue GRPC::Unavailable, GRPC::GRPC::DeadlineExceeded
+          # This will show the server as being out of date
+          Gitaly::ServerInfoResponse.new(git_version: '', server_version: '')
+        end
+    end
+  end
+end

lib/gitlab/gitaly_client/server_service.rb

+module Gitlab
+  module GitalyClient
+    # Meant for extraction of server data, and later maybe to perform misc task
+    #
+    # Not meant for connection logic, look in Gitlab::GitalyClient
+    class ServerService
+      def initialize(storage)
+        @storage = storage
+      end
+
+      def info
+        GitalyClient.call(@storage, :server_service, :server_info, Gitaly::ServerInfoRequest.new)
+      end
+    end
+  end
+end

spec/controllers/admin/gitaly_servers_controller_spec.rb

+require 'spec_helper'
+
+describe Admin::GitalyServersController do
+  describe '#index' do
+    before do
+      sign_in(create(:admin))
+    end
+
+    it 'shows the gitaly servers page' do
+      get :index
+
+      expect(response).to have_gitlab_http_status(200)
+    end
+  end
+end

spec/lib/gitaly/server_spec.rb

+require 'spec_helper'
+
+describe Gitaly::Server do
+  describe '.all' do
+    let(:storages) { Gitlab.config.repositories.storages }
+
+    it 'includes all storages' do
+      expect(storages.count).to eq(described_class.all.count)
+      expect(storages.keys).to eq(described_class.all.map(&:storage))
+    end
+  end
+
+  subject { described_class.all.first }
+
+  it { is_expected.to respond_to(:server_version) }
+  it { is_expected.to respond_to(:git_binary_version) }
+  it { is_expected.to respond_to(:up_to_date?) }
+  it { is_expected.to respond_to(:address) }
+
+  describe 'request memoization' do
+    context 'when requesting multiple properties', :request_store do
+      it 'uses memoization for the info request' do
+        expect do
+          subject.server_version
+          subject.up_to_date?
+        end.to change { Gitlab::GitalyClient.get_request_count }.by(1)
+      end
+    end
+  end
+end