add stat api

apps/iot/src/endpoint/iot_zd_endpoint.erl

@@ -14,7 +14,7 @@
 
 %% API
 -export([start_link/0]).
--export([get_pid/0, forward/4, get_stat/0]).
+-export([get_pid/0, forward/4, get_stat/0, get_num/1]).
 
 %% gen_statem callbacks
 -export([init/1, handle_event/4, terminate/3, code_change/4, callback_mode/0]).
@@ -38,8 +38,8 @@
     %% 是否繁忙
     is_busy = false :: boolean(),
 
-    %% 记录成功处理的消息数
-    acc_num = 0
+    %% 记录成功处理的消息数, 记日期和总数的映射关系
+    acc_num = #{}
 }).
 
 %%%===================================================================
@@ -58,6 +58,10 @@ forward(LocationCode, DynamicLocationCode, Fields, Timestamp) when is_binary(Loc
 get_stat() ->
     gen_statem:call(?MODULE, get_stat, 5000).
 
+-spec get_num(Date :: string()) -> {ok, Num :: integer()}.
+get_num(Date) when is_list(Date) ->
+    gen_statem:call(?MODULE, {get_num, Date}, 5000).
+
 %% @doc Creates a gen_statem process which calls Module:init/1 to
 %% initialize. To ensure a synchronized start-up procedure, this
 %% function does not return until Module:init/1 has returned.
@@ -142,7 +146,11 @@ handle_event(info, {ack, AssocMessage}, StateName, State = #state{timer_ref = Ti
               end,
     is_reference(TimerRef) andalso erlang:cancel_timer(TimerRef),
 
-    {keep_state, State#state{timer_ref = undefined, acc_num = AccNum + 1, is_busy = false}, Actions};
+    Date = iot_util:date(),
+    Num = maps:get(Date, AccNum, 0),
+    NAccNum = AccNum#{Date => Num + 1},
+
+    {keep_state, State#state{timer_ref = undefined, acc_num = NAccNum, is_busy = false}, Actions};
 
 %% 收到重发过期请求
 handle_event(info, {timeout, _, {repost_ticker, Body}}, connected, State = #state{postman_pid = PostmanPid}) ->
@@ -177,6 +185,10 @@ handle_event({call, From}, get_stat, StateName, State = #state{acc_num = AccNum,
     },
     {keep_state, State, [{reply, From, Stat}]};
 
+%% 获取当前统计信息
+handle_event({call, From}, {get_num, Date}, _StateName, State = #state{acc_num = AccNum}) ->
+    {keep_state, State, [{reply, From, maps:get(Date, AccNum, 0)}]};
+
 %% postman进程挂掉时，重新建立新的
 handle_event(info, {'EXIT', PostmanPid, Reason}, connected, State = #state{timer_ref = TimerRef, postman_pid = PostmanPid}) ->
     lager:warning("[iot_zd_endpoint] postman exited with reason: ~p", [Reason]),

apps/iot/src/http_handler/api_handler.erl

@@ -0,0 +1,29 @@
+%%%-------------------------------------------------------------------
+%%% @author licheng5
+%%% @copyright (C) 2020, <COMPANY>
+%%% @doc
+%%%
+%%% @end
+%%% Created : 26. 4月 2020 3:36 下午
+%%%-------------------------------------------------------------------
+-module(api_handler).
+-author("licheng5").
+-include("iot.hrl").
+
+%% API
+-export([handle_request/4]).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% helper methods
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+handle_request("GET", "/api/stat", _, _) ->
+    Date = iot_util:date(),
+    ZDNum = iot_zd_endpoint:get_num(Date),
+    {ok, 200, iot_util:json_data(#{
+        <<"zd_num">> => ZDNum
+    })};
+
+handle_request(_, Path, _, _) ->
+    Path1 = list_to_binary(Path),
+    {ok, 200, iot_util:json_error(-1, <<"url: ", Path1/binary, " not found">>)}.

apps/iot/src/iot_app.erl

@@ -46,6 +46,7 @@ start_http_server() ->
 
     Dispatcher = cowboy_router:compile([
         {'_', [
+            {"/api/[...]", http_protocol, [api_handler]},
             {"/host/[...]", http_protocol, [host_handler]},
             {"/device/[...]", http_protocol, [device_handler]},
             {"/totalizator/[...]", http_protocol, [totalizator_handler]},

apps/iot/src/iot_util.erl

@@ -15,6 +15,7 @@
 -export([json_data/1, json_error/2]).
 -export([queue_limited_in/3, assert_call/2, assert/2]).
 -export([format_timestamp/1]).
+-export([date/0]).
 
 %% 格式化时间
 -spec format_timestamp(Timestamp :: integer()) -> integer().
@@ -163,4 +164,8 @@ file_uri(Filename) when is_binary(Filename) ->
             {ok, <<"https://lgsiot.njau.edu.cn/upload/", Year/binary, $/, Month/binary, $/, Day/binary, $/, Filename/binary>>};
         _ ->
             error
-    end.
+    end.
+
+date() ->
+    {{Y, M, D}, _} = calendar:local_time(),
+    io_lib:format("~b-~2..0b-~2..0b", [Y, M, D]).