/
riak_eventer.erl
135 lines (111 loc) · 4.91 KB
/
riak_eventer.erl
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%% 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.
-module(riak_eventer).
-behaviour(gen_server2).
-export([start_link/0,start_link/1,stop/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([notify/1,notify/3,eventer_config/1,do_eventer/1]).
-include_lib("eunit/include/eunit.hrl").
%% @private
start_link() -> gen_server2:start_link({local, ?MODULE}, ?MODULE, [], []).
start_link(test) -> % when started this way, run a mock server (nop)
gen_server2:start_link({local, ?MODULE}, ?MODULE, [test], []).
%% @private
init([]) -> {ok, stateless_server};
init([test]) -> {ok, test}.
notify(Event) ->
gen_server2:cast(riak_local_logger, {event, Event}),
gen_server2:cast(?MODULE, {event, Event}).
notify(Module, EventName, EventDetail) ->
notify({Module, EventName, node(), EventDetail}).
%% @private (only used for test instances)
stop() -> gen_server2:cast(?MODULE, stop).
%% @private
handle_cast(stop, State) -> {stop,normal,State};
handle_cast({event, _Event}, test) -> {noreply,test};
handle_cast({event, Event}, State) ->
{ok, Ring} = riak_ring_manager:get_my_ring(), %%%% TEST EVENTS!
Eventers = match_eventers(get_eventers(Ring), Event, []),
[gen_event:notify({riak_event,Node},Event) || Node <- Eventers],
{noreply, State}.
eventer_config([Cluster, CookieStr]) ->
RipConf = [{no_config, true}, {cluster_name, Cluster},
{riak_cookie, list_to_atom(CookieStr)}, {ring_state_dir, "<nostore>"},
{ring_creation_size, 12}, {gossip_interval,1000000},
{wants_claim_fun, {riak_claim, never_wants_claim}},
{riak_web_ip, "undefined"},
{doorbell_port, 7000 + random:uniform(1000)},
{storage_backend, undefined}],
application:stop(sasl),
application:unload(sasl),
ok = application:load({application,sasl,[{errlog_type,error}]}),
ok = application:start(sasl),
[application:set_env(riak,K,V) || {K,V} <- RipConf].
parse_matchspec(MatchSpec) when is_list(MatchSpec) ->
[NM,MM,TM] = string:tokens(MatchSpec, ":"),
{list_to_atom(NM),list_to_atom(MM),list_to_atom(TM)}.
do_eventer([IP, PortStr, HandlerName, HandlerArg]) ->
do_eventer([IP, PortStr, HandlerName, HandlerArg, "_:_:_"]);
do_eventer([IP, PortStr, HandlerName, HandlerArg, MatchSpec]) ->
MS = parse_matchspec(MatchSpec),
riak_startup:join_cluster([IP, PortStr]),
timer:sleep(random:uniform(1000)), % let some gossip happen
riak_event_guard:add_handler(list_to_atom(HandlerName),HandlerArg, MS),
ok.
get_eventers(Ring) ->
case riak_ring:get_meta(eventers, Ring) of
undefined -> [];
{ok, X} -> sets:to_list(X)
end.
match_eventers([], _, Acc) ->
Acc;
match_eventers([{Eventer,MS}|Rest], Event, Acc) ->
case match_event(MS,Event) of
true ->
match_eventers(Rest, Event, [Eventer|Acc]);
false ->
match_eventers(Rest, Event, Acc)
end.
match_event({'_','_','_'}, _) -> true;
match_event({'_',Module,Type},{M,T,_N,_}) -> match_event({Module,Type},{M,T});
match_event({N,Module,Type}, {M,T,N,_}) -> match_event({Module,Type},{M,T});
match_event({_Node,_Module,_Type}, {_M,_T,_N,_}) -> false;
match_event({'_', Type}, {_M,T}) -> match_event({Type}, {T});
match_event({M,Type}, {M,T}) -> match_event({Type}, {T});
match_event({_Module, _Type}, {_M, _T}) -> false;
match_event({'_'}, {_}) -> true;
match_event({T}, {T}) -> true;
match_event(_, _) -> false.
handle_info(_Info, State) -> {noreply, State}.
%% @private
terminate(_Reason, _State) -> ok.
%% @private
code_change(_OldVsn, State, _Extra) -> {ok, State}.
%% @private
handle_call(_, _From, State) -> {reply, no_call_support, State}.
match_eventer_test() ->
Event1 = {some_mod, some_type, some_node, {some_detail}},
Event2 = {some_mod, some_type, other_node, {some_detail}},
Event3 = {some_mod, other_type, other_node, {some_detail}},
Event4 = {other_mod, other_type, other_node, {some_detail}},
MS1 = {'_', '_', '_'},
MS2 = {some_node, '_', '_'},
MS3 = {some_node, some_mod, '_'},
MS4 = {some_node, some_mod, some_type},
?assertEqual(match_event(MS1, Event1), true),
?assertEqual(match_event(MS2, Event1), true),
?assertEqual(match_event(MS2, Event2), false),
?assertEqual(match_event(MS3, Event1), true),
?assertEqual(match_event(MS3, Event3), false),
?assertEqual(match_event(MS4, Event1), true),
?assertEqual(match_event(MS4, Event4), false).