Introduce rabbit_upgrade_preparation

Part of rabbitmq/rabbitmq-cli#408.

1 files changed, 60 insertions, 0 deletions

diff --git a/src/rabbit_upgrade_preparation.erl b/src/rabbit_upgrade_preparation.erl
new file mode 100644
index 0000000000..2ff422102c
--- /dev/null
+++ b/src/rabbit_upgrade_preparation.erl
@@ -0,0 +1,60 @@
+%% The contents of this file are subject to the Mozilla Public License
+%% Version 1.1 (the "License"); you may not use this file except in
+%% compliance with the License. You may obtain a copy of the License
+%% at https://www.mozilla.org/MPL/
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and
+%% limitations under the License.
+%%
+%% The Original Code is RabbitMQ.
+%%
+%% The Initial Developer of the Original Code is GoPivotal, Inc.
+%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
+%%
+
+-module(rabbit_upgrade_preparation).
+
+-export([await_online_quorum_plus_one/1, await_online_synchronised_mirrors/1]).
+
+%%
+%% API
+%%
+
+-define(SAMPLING_INTERVAL, 200).
+
+await_online_quorum_plus_one(Timeout) ->
+    Iterations = ceil(Timeout / ?SAMPLING_INTERVAL),
+    do_await_safe_online_quorum(Iterations).
+
+
+await_online_synchronised_mirrors(Timeout) ->
+    Iterations = ceil(Timeout / ?SAMPLING_INTERVAL),
+    do_await_online_synchronised_mirrors(Iterations).
+
+
+%%
+%% Implementation
+%%
+
+do_await_safe_online_quorum(0) ->
+    false;
+do_await_safe_online_quorum(IterationsLeft) ->
+    case rabbit_quorum_queue:list_with_minimum_quorum() of
+        []  -> true;
+        List when is_list(List) ->
+            timer:sleep(?SAMPLING_INTERVAL),
+            do_await_safe_online_quorum(IterationsLeft - 1)
+    end.
+
+
+do_await_online_synchronised_mirrors(0) ->
+    false;
+do_await_online_synchronised_mirrors(IterationsLeft) ->
+    case rabbit_amqqueue:list_local_mirrored_classic_without_synchronised_mirrors() of
+        []  -> true;
+        List when is_list(List) ->
+            timer:sleep(?SAMPLING_INTERVAL),
+            do_await_online_synchronised_mirrors(IterationsLeft - 1)
+    end.