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%% -------------------------------------------------------------------
%%
%% riaknostic - automated diagnostic tools for Riak
%%
%% Copyright (c) 2011 Basho Technologies, Inc. All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file
%% except in compliance with the License. You may obtain
%% a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%%
%% -------------------------------------------------------------------
%% @doc Diagnostic check that detects cluster members that are down.
-module(riaknostic_check_nodes_connected).
-behaviour(riaknostic_check).
-export([description/0,
valid/0,
check/0,
format/1]).
-spec description() -> string().
description() ->
"Cluster node liveness".
-spec valid() -> boolean().
valid() ->
riaknostic_node:can_connect().
-spec check() -> [{lager:log_level(), term()}].
check() ->
Stats = riaknostic_node:stats(),
{connected_nodes, ConnectedNodes} = lists:keyfind(connected_nodes, 1, Stats),
{ring_members, RingMembers} = lists:keyfind(ring_members, 1, Stats),
{nodename, NodeName} = lists:keyfind(nodename, 1, Stats),
[ {warning, {node_disconnected, N}} || N <- RingMembers,
N =/= NodeName,
lists:member(N, ConnectedNodes) == false].
-spec format(term()) -> {io:format(), [term()]}.
format({node_disconnected, Node}) ->
{"Cluster member ~s is not connected to this node. Please check whether it is down.", [Node]}.
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