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Add basic sanity check for estatsd_server
Validate that the server can receive and buffer metrics via UDP and send the aggregated data to "graphite" over TCP.
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Seth Falcon
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Nov 27, 2012
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%% Copyright 2012 Opscode, 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. | ||
%% | ||
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-module(capture_tcp). | ||
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-behaviour(gen_server). | ||
-define(SERVER, ?MODULE). | ||
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-define(to_int(Value), list_to_integer(binary_to_list(Value))). | ||
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-export([peek/0, | ||
read/0, | ||
start_link/1, | ||
stop/0, | ||
what_port/0]). | ||
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%% ------------------------------------------------------------------ | ||
%% gen_server Function Exports | ||
%% ------------------------------------------------------------------ | ||
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, | ||
code_change/3]). | ||
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-record(state, {port :: non_neg_integer(), | ||
socket :: inet:socket(), | ||
msg_count = 0 :: non_neg_integer(), | ||
buffer = [] :: iolist() | ||
}). | ||
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%% ------------------------------------------------------------------ | ||
%% API Function Definitions | ||
%% ------------------------------------------------------------------ | ||
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-spec start_link(non_neg_integer()) -> {ok, pid()} | {error, any()}. | ||
%% @doc Start a UDP capture server listening on `Port'. If `Port' is | ||
%% `0', the system will assign a usable port which you can later | ||
%% discover using {@link capture_udp:what_port/0}. | ||
start_link(Port) -> | ||
gen_server:start_link({local, ?SERVER}, ?MODULE, Port, []). | ||
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stop() -> | ||
gen_server:call(?SERVER, stop). | ||
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-spec what_port() -> {ok, non_neg_integer()}. | ||
%% @doc Return the port this server is listening on. | ||
what_port() -> | ||
gen_server:call(?SERVER, what_port). | ||
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-spec peek() -> {non_neg_integer(), iolist()}. | ||
%% @doc Return the count and collected message iolist for the server. | ||
%% The server state is not modified. | ||
%% @see capture_udp:read/0 | ||
peek() -> | ||
gen_server:call(?SERVER, peek). | ||
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-spec read() -> {non_neg_integer(), iolist()}. | ||
%% @doc Return the message count and collected message iolist for the server. | ||
%% Calling this function resets the message buffer and message counter. | ||
%% @see capture_udp:peek/0 | ||
read() -> | ||
gen_server:call(?SERVER, read). | ||
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%% ------------------------------------------------------------------ | ||
%% gen_server Function Definitions | ||
%% ------------------------------------------------------------------ | ||
recv_server(LS) -> | ||
case gen_tcp:accept(LS) of | ||
{ok, S} -> | ||
recv_loop(S, []), | ||
recv_server(LS); | ||
Other -> | ||
io:format("accept returned ~w - goodbye!~n", [Other]), | ||
ok | ||
end. | ||
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recv_loop(S, Acc) -> | ||
inet:setopts(S, [{active,once}]), | ||
receive | ||
{tcp, S, Data} -> | ||
recv_loop(S, [Data| Acc]); | ||
{tcp_closed, S} -> | ||
%% io:format("Socket ~w closed [~w]~n", [S, self()]), | ||
%% io:format("Data: ~p~n", [lists:reverse(Acc)]), | ||
gen_server:call(?SERVER, {do_recv, lists:reverse(Acc)}), | ||
ok | ||
end. | ||
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init(Port) -> | ||
error_logger:info_msg("capture_tcp listening on ~p~n", [Port]), | ||
{ok, LSocket} = gen_tcp:listen(Port, [binary, {active, true}, {packet, 0}]), | ||
spawn(fun() -> recv_server(LSocket) end), | ||
{ok, #state{port = Port, socket = LSocket}}. | ||
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handle_call(peek, _From, #state{msg_count = Count, buffer = Buffer}=State) -> | ||
{reply, {Count, lists:reverse(Buffer)}, State}; | ||
handle_call(read, _From, #state{msg_count = Count, buffer = Buffer}=State) -> | ||
{reply, {Count, lists:reverse(Buffer)}, State#state{msg_count = 0, buffer = []}}; | ||
handle_call(what_port, _From, #state{socket = Sock}=State) -> | ||
{reply, inet:port(Sock), State}; | ||
handle_call(stop, _From, State) -> | ||
{stop, normal, ok, State}; | ||
handle_call({do_recv, Data}, _From, #state{msg_count = Count, buffer = Buffer}=State) -> | ||
{reply, ok, State#state{msg_count = Count + 1, buffer = [Data | Buffer]}}; | ||
handle_call(_Request, _From, State) -> | ||
{noreply, ok, State}. | ||
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handle_cast(_Msg, State) -> | ||
{noreply, State}. | ||
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handle_info(_Msg, State) -> | ||
{noreply, State}. | ||
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terminate(_Reason, _State) -> | ||
ok. | ||
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code_change(_OldVsn, State, _Extra) -> | ||
{ok, State}. |
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-module(estatsd_server_tests). | ||
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-compile([export_all]). | ||
-include_lib("eunit/include/eunit.hrl"). | ||
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setup_server() -> | ||
UdpMaxBatchSize = 1, | ||
UdpMaxBatchAge = 1000, | ||
UdpBuf = 524288, | ||
EstatsdPort = 3344, | ||
{ok, _} = capture_tcp:start_link(0), | ||
{ok, CapturePort} = capture_tcp:what_port(), | ||
application:set_env(estatsd, flush_interval, 2000), | ||
application:set_env(estatsd, graphite_host, "127.0.0.1"), | ||
application:set_env(estatsd, graphite_port, CapturePort), | ||
application:set_env(estatsd, udp_listen_port, EstatsdPort), | ||
application:set_env(estatsd, udp_recbuf, UdpBuf), | ||
application:set_env(estatsd, udp_max_batch_size, UdpMaxBatchSize), | ||
application:set_env(estatsd, udp_max_batch_age, UdpMaxBatchAge), | ||
application:start(crypto), | ||
application:start(inets), | ||
application:start(estatsd). | ||
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cleanup_server() -> | ||
capture_tcp:stop(), | ||
application:stop(estatsd). | ||
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estatsd_sanity_test_() -> | ||
{setup, | ||
fun() -> | ||
setup_server() end, | ||
fun(_) -> | ||
cleanup_server() end, | ||
[{"UDP metrics sent to estatsd are buffered and then sent to graphite", | ||
fun() -> | ||
Port = 3344, | ||
{ok, S} = gen_udp:open(0), | ||
ok = gen_udp:send(S, "127.0.0.1", Port, <<"mycounter:10|c">>), | ||
ok = gen_udp:send(S, "127.0.0.1", Port, <<"mycounter:10|c">>), | ||
ok = gen_udp:send(S, "127.0.0.1", Port, <<"mycounter:5|d">>), | ||
timer:sleep(3000), | ||
{MsgCount, _Msgs} = capture_tcp:read(), | ||
?debugVal(_Msgs), | ||
%% three UDP messages are sent, but these will be aggregated into | ||
%% a single message sent off to "graphite". | ||
?assertEqual(1, MsgCount), | ||
%% ?assert(lists:member(<<"mycounter">>, Metrics)), | ||
%% MyCounter = folsom_metrics:get_metric_value(<<"mycounter">>), | ||
%% ?debugVal(MyCounter), | ||
ok | ||
end}]}. | ||
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multi() -> | ||
Port = 3344, | ||
{ok, S} = gen_udp:open(0), | ||
Self = self(), | ||
SendUdp = fun() -> | ||
Msg = <<"multicounter:10|c">>, | ||
ok = gen_udp:send(S, "127.0.0.1", Port, Msg), | ||
Self ! self(), | ||
ok | ||
end, | ||
Pids = [ spawn(SendUdp) || _I <- lists:seq(1, 10) ], | ||
gather_pids(Pids), | ||
%% Metrics = folsom_metrics:get_metrics(), | ||
%% ?assertEqual(lists:usort(Metrics), Metrics), | ||
%% ?debugVal(Metrics), | ||
%% ?assert(lists:member(<<"multicounter">>, Metrics)), | ||
%% MultiCounter = folsom_metrics:get_metric_value(<<"multicounter">>), | ||
%% ?debugVal(MultiCounter), | ||
ok. | ||
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mass(N) -> | ||
Port = 3344, | ||
{ok, S} = gen_udp:open(0), | ||
Self = self(), | ||
SendUdp = fun() -> | ||
Id = integer_to_list(crypto:rand_uniform(1, 300)), | ||
Msg = iolist_to_binary([<<"metric_">>, Id, <<":10|c">>]), | ||
ok = gen_udp:send(S, "127.0.0.1", Port, Msg), | ||
Self ! self(), | ||
ok | ||
end, | ||
Pids = [ spawn(SendUdp) || _I <- lists:seq(1, N) ], | ||
gather_pids(Pids), | ||
%% Metrics = folsom_metrics:get_metrics(), | ||
%% ?assertEqual(lists:usort(Metrics), lists:sort(Metrics)), | ||
%% ?debugVal(Metrics), | ||
ok. | ||
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gather_pids([Pid|Rest]) -> | ||
receive | ||
Pid -> | ||
gather_pids(Rest) | ||
after 2000 -> | ||
gather_pids(Rest) | ||
end; | ||
gather_pids([]) -> | ||
done. | ||
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