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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_mgmt_wm_node_memory_ets).
-export([init/2, to_json/2, content_types_provided/2, is_authorized/2]).
-export([resource_exists/2]).
-export([variances/2]).
-include_lib("rabbitmq_management_agent/include/rabbit_mgmt_records.hrl").
-include_lib("rabbit_common/include/rabbit.hrl").
%%--------------------------------------------------------------------
init(Req, [Mode]) ->
{cowboy_rest, rabbit_mgmt_headers:set_common_permission_headers(Req, ?MODULE), {Mode, #context{}}}.
variances(Req, Context) ->
{[<<"accept-encoding">>, <<"origin">>], Req, Context}.
content_types_provided(ReqData, Context) ->
{rabbit_mgmt_util:responder_map(to_json), ReqData, Context}.
resource_exists(ReqData, Context) ->
{node_exists(ReqData, get_node(ReqData)), ReqData, Context}.
to_json(ReqData, {Mode, Context}) ->
rabbit_mgmt_util:reply(augment(Mode, ReqData), ReqData, {Mode, Context}).
is_authorized(ReqData, {Mode, Context}) ->
{Res, RD, C} = rabbit_mgmt_util:is_authorized_monitor(ReqData, Context),
{Res, RD, {Mode, C}}.
%%--------------------------------------------------------------------
get_node(ReqData) ->
list_to_atom(binary_to_list(rabbit_mgmt_util:id(node, ReqData))).
get_filter(ReqData) ->
case rabbit_mgmt_util:id(filter, ReqData) of
none -> all;
<<"management">> -> rabbit_mgmt_storage;
Other when is_binary(Other) -> list_to_atom(binary_to_list(Other));
_ -> all
end.
node_exists(ReqData, Node) ->
case [N || N <- rabbit_mgmt_wm_nodes:all_nodes(ReqData),
proplists:get_value(name, N) == Node] of
[] -> false;
[_] -> true
end.
augment(Mode, ReqData) ->
Node = get_node(ReqData),
Filter = get_filter(ReqData),
case node_exists(ReqData, Node) of
false ->
not_found;
true ->
case rpc:call(Node, rabbit_vm, ets_tables_memory,
[Filter], infinity) of
{badrpc, _} -> [{ets_tables_memory, not_available}];
[] -> [{ets_tables_memory, no_tables}];
Result -> [{ets_tables_memory, format(Mode, Result)}]
end
end.
format(absolute, Result) ->
Total = lists:sum([V || {_K,V} <- Result]),
[{total, Total} | Result];
format(relative, Result) ->
Total = lists:sum([V || {_K,V} <- Result]),
[{total, 100} | [{K, percentage(V, Total)} || {K, V} <- Result]].
percentage(Part, Total) ->
case round((Part/Total) * 100) of
0 when Part =/= 0 ->
1;
Int ->
Int
end.
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