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mc_daemon.erl
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mc_daemon.erl
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-module(mc_daemon).
-behaviour(gen_server).
%% API
-export([start_link/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
-include("couch_db.hrl").
-include("mc_constants.hrl").
-record(state, {mc_serv}).
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
init([]) ->
?LOG_INFO("MC daemon: starting.", []),
{ok, S} = mc_tcp_listener:start_link(11213, self()),
{ok, #state{mc_serv=S}}.
handle_call({_OpCode, _Header, _Key, _Body, _CAS}, _From, State) ->
{reply, #mc_response{status=?UNKNOWN_COMMAND, body="WTF, mate?"}, State};
handle_call(Request, _From, State) ->
?LOG_DEBUG("MC daemon: got call.", [Request]),
Reply = ok,
{reply, Reply, State}.
mk_stat(K, V) -> #mc_response{key=K, body=V}.
round_value(Val) when not is_number(Val) ->
Val;
round_value(Val) when Val == 0 ->
integer_to_list(Val);
round_value(Val) when is_float(Val) ->
lists:flatten(io_lib:format("~.6f", [Val]));
round_value(Val) ->
lists:flatten(io_lib:format("~p", [Val])).
%% float_to_list(erlang:round(Val * 1000.0) / 1000.0).
emit_stat_prop(_Socket, _Opaque, _Prefix, _Key, null) ->
ok;
emit_stat_prop(Socket, Opaque, Prefix, Key, Value) ->
mc_connection:respond(Socket, ?STAT, Opaque,
mk_stat(Prefix ++ atom_to_list(Key),
round_value(Value))).
stats_section(Socket, Opaque, {Values}, Prefix, 0) ->
lists:foreach(fun(StatKey) -> emit_stat_prop(Socket, Opaque, Prefix, StatKey,
proplists:get_value(StatKey, Values))
end, proplists:get_keys(Values));
stats_section(Socket, Opaque, {Values}, Prefix, N) ->
lists:foreach(fun(StatKey) ->
stats_section(Socket, Opaque,
proplists:get_value(StatKey, Values),
Prefix ++ atom_to_list(StatKey) ++ ":", N - 1)
end, proplists:get_keys(Values)).
handle_cast({?STAT, _Extra, _Key, _Body, _CAS, Socket, Opaque}, State) ->
{AllStats} = couch_stats_aggregator:all(),
?LOG_INFO("Got stats: ~p~n", [proplists:get_keys(AllStats)]),
stats_section(Socket, Opaque, {AllStats}, "", 2),
mc_connection:respond(Socket, ?STAT, Opaque, mk_stat("", "")),
{noreply, State};
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.