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.

2 files changed, 59 insertions, 0 deletions

diff --git a/lib/gitaly/server.rb b/lib/gitaly/server.rb
new file mode 100644
index 00000000000..605e93022e7
--- /dev/null
+++ b/lib/gitaly/server.rb
@@ -0,0 +1,43 @@
+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+          # This will show the server as being out of date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
diff --git a/lib/gitlab/gitaly_client/server_service.rb b/lib/gitlab/gitaly_client/server_service.rb
new file mode 100644
index 00000000000..2e1076d1f66
--- /dev/null
+++ b/lib/gitlab/gitaly_client/server_service.rb
@@ -0,0 +1,16 @@
+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