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%% 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 http://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 VMware, Inc.
%% Copyright (c) 2007-2011 VMware, Inc. All rights reserved.
%%
-module(rabbit_node_monitor).
-behaviour(gen_server).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([notify_cluster/0, rabbit_running_on/1]).
-define(SERVER, ?MODULE).
-define(RABBIT_UP_RPC_TIMEOUT, 2000).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(rabbit_running_on/1 :: (node()) -> 'ok').
-spec(notify_cluster/0 :: () -> 'ok').
-endif.
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
rabbit_running_on(Node) ->
gen_server:cast(rabbit_node_monitor, {rabbit_running_on, Node}).
notify_cluster() ->
Node = node(),
Nodes = rabbit_mnesia:running_clustered_nodes() -- [Node],
%% notify other rabbits of this rabbit
case rpc:multicall(Nodes, rabbit_node_monitor, rabbit_running_on,
[Node], ?RABBIT_UP_RPC_TIMEOUT) of
{_, [] } -> ok;
{_, Bad} -> rabbit_log:info("failed to contact nodes ~p~n", [Bad])
end,
%% register other active rabbits with this rabbit
[ rabbit_node_monitor:rabbit_running_on(N) || N <- Nodes ],
ok.
%%--------------------------------------------------------------------
init([]) ->
ok = net_kernel:monitor_nodes(true),
{ok, no_state}.
handle_call(_Request, _From, State) ->
{noreply, State}.
handle_cast({rabbit_running_on, Node}, State) ->
rabbit_log:info("node ~p up~n", [Node]),
erlang:monitor(process, {rabbit, Node}),
ok = rabbit_alarm:on_node_up(Node),
{noreply, State};
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info({nodedown, Node}, State) ->
rabbit_log:info("node ~p down~n", [Node]),
ok = handle_dead_rabbit(Node),
{noreply, State};
handle_info({'DOWN', _MRef, process, {rabbit, Node}, _Reason}, State) ->
rabbit_log:info("node ~p lost 'rabbit'~n", [Node]),
ok = handle_dead_rabbit(Node),
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%% TODO: This may turn out to be a performance hog when there are lots
%% of nodes. We really only need to execute some of these statements
%% on *one* node, rather than all of them.
handle_dead_rabbit(Node) ->
ok = rabbit_networking:on_node_down(Node),
ok = rabbit_amqqueue:on_node_down(Node),
ok = rabbit_alarm:on_node_down(Node).
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