src/beam_stats_consumer_graphite.erl

   1 -module(beam_stats_consumer_graphite).
   2
   3 -include("include/beam_stats.hrl").
   4 -include("beam_stats_logging.hrl").
   5
   6 -behaviour(beam_stats_consumer).
   7
   8 -export_type(
   9     [ option/0
  10     ]).
  11
  12 -export(
  13     [ init/1
  14     , consume/2
  15     , terminate/1
  16     ]).
  17
  18 -type option() ::
  19       {consumption_interval , non_neg_integer()}
  20     | {host                 , inet:ip_address() | inet:hostname()}
  21     | {port                 , inet:port_number()}
  22     | {timeout              , timeout()}
  23     .
  24
  25 -record(state,
  26     { sock    = none :: hope_option:t(Socket :: port())
  27     , host           :: inet:ip_address() | inet:hostname()
  28     , port           :: inet:port_number()
  29     , timeout        :: timeout()
  30     }).
  31
  32 -type state() ::
  33     #state{}.
  34
  35 -define(PATH_PREFIX         , <<"beam_stats">>).
  36 -define(DEFAULT_HOST        , "localhost").
  37 -define(DEFAULT_PORT        , 2003).
  38 -define(DEFAULT_TIMEOUT     , 5000).
  39
  40 -spec init([option()]) ->
  41     {non_neg_integer(), state()}.
  42 init(Options) ->
  43     Get = fun (Key, Default) -> hope_kv_list:get(Options, Key, Default) end,
  44     ConsumptionInterval = Get(consumption_interval, 60000),
  45     State = #state
  46         { sock    = none
  47         , host    = Get(host    , ?DEFAULT_HOST)
  48         , port    = Get(port    , ?DEFAULT_PORT)
  49         , timeout = Get(timeout , ?DEFAULT_TIMEOUT)
  50         },
  51     {ConsumptionInterval, State}.
  52
  53 -spec consume(beam_stats_consumer:queue(), state()) ->
  54     state().
  55 consume(Q, #state{}=State1) ->
  56     Payload = beam_stats_queue_to_binary(Q),
  57     State2 = try_to_connect_if_no_socket(State1),
  58     try_to_send(State2, Payload).
  59
  60 -spec terminate(state()) ->
  61     {}.
  62 terminate(#state{sock=SockOpt}) ->
  63     ok = hope_option:iter(SockOpt, fun gen_tcp:close/1),
  64     {}.
  65
  66 %% ============================================================================
  67
  68 -spec try_to_send(state(), binary()) ->
  69     state().
  70 try_to_send(#state{sock=none}=State, _) ->
  71     ?log_error("Sending failed. No socket in state."),
  72     % TODO: Maybe schedule retry?
  73     State;
  74 try_to_send(#state{sock={some, Sock}}=State, Payload) ->
  75     case gen_tcp:send(Sock, Payload)
  76     of  ok ->
  77             State
  78     ;   {error, _}=Error ->
  79             ?log_error("gen_tcp:send(~p, ~p) -> ~p", [Sock, Payload, Error]),
  80             % TODO: Maybe schedule retry?
  81             ok = gen_tcp:close(Sock),
  82             State#state{sock=none}
  83     end.
  84
  85 -spec try_to_connect_if_no_socket(state()) ->
  86     state().
  87 try_to_connect_if_no_socket(#state{sock={some, _}}=State) ->
  88     State;
  89 try_to_connect_if_no_socket(
  90     #state
  91     { sock    = none
  92     , host    = Host
  93     , port    = Port
  94     , timeout = Timeout
  95     }=State
  96 ) ->
  97     Options = [binary, {active, false}],
  98     case gen_tcp:connect(Host, Port, Options, Timeout)
  99     of  {ok, Sock} ->
 100             State#state{sock = {some, Sock}}
 101     ;   {error, _}=Error ->
 102             ?log_error(
 103                 "gen_tcp:connect(~p, ~p, ~p, ~p) -> ~p",
 104                 [Host, Port, Options, Timeout, Error]
 105             ),
 106             State#state{sock = none}
 107     end.
 108
 109 -spec beam_stats_queue_to_binary(beam_stats_consumer:queue()) ->
 110     binary().
 111 beam_stats_queue_to_binary(Q) ->
 112     Bins = [beam_stats_to_bins(B) || B <- queue:to_list(Q)],
 113     iolist_to_binary(Bins).
 114
 115 -spec beam_stats_to_bins(beam_stats:t()) ->
 116     [binary()].
 117 beam_stats_to_bins(#beam_stats{}=BeamStats) ->
 118     MsgAddPrefix =
 119         fun (M) -> beam_stats_msg_graphite:add_path_prefix(M, ?PATH_PREFIX) end,
 120     Msgs1 = beam_stats_msg_graphite:of_beam_stats(BeamStats),
 121     Msgs2 = lists:map(MsgAddPrefix, Msgs1),
 122     lists:map(fun beam_stats_msg_graphite:to_bin/1, Msgs2).