refactor: improve the _api_clieints implement

apps/emqx_gateway/etc/emqx_gateway.conf.example

@@ -70,9 +70,9 @@ gateway.stomp {
     ## SSL options
     ## See ${example_common_ssl_options} for more information
     ssl.versions = ["tlsv1.3", "tlsv1.2", "tlsv1.1", "tlsv1"]
-    ssl.keyfile = "{{ platform_etc_dir }}/certs/key.pem"
-    ssl.certfile = "{{ platform_etc_dir }}/certs/cert.pem"
     ssl.cacertfile = "{{ platform_etc_dir }}/certs/cacert.pem"
+    ssl.certfile = "{{ platform_etc_dir }}/certs/cert.pem"
+    ssl.keyfile = "{{ platform_etc_dir }}/certs/key.pem"
     #ssl.verify = verify_none
     #ssl.fail_if_no_peer_cert = false
     #ssl.server_name_indication = disable

apps/emqx_gateway/src/emqx_gateway_api.erl

@@ -318,7 +318,9 @@ listeners_schema(?R_REF(_Mod, udp_tcp_listeners)) ->
 %% examples
 
 examples_gateway_confs() ->
-    #{ a_stomp_gateway =>
+    #{ stomp_gateway =>
+        #{ summary => <<"A simple STOMP gateway configs">>
+         , value =>
             #{ enable => true
              , enable_stats => true
              , idle_timeout => <<"30s">>
@@ -329,10 +331,14 @@ examples_gateway_confs() ->
                  , max_body_length => 65535
                  }
              }
-     , a_mqttsn_gateway =>
+         }
+     , mqttsn_gateway =>
+        #{ summary => <<"A simple MQTT-SN gateway configs">>
+         , value =>
             #{ enable => true
              , enable_stats => true
              }
+         }
      }.
 
 examples_gateway_stats() ->

apps/emqx_gateway/src/emqx_gateway_api_clients.erl

@@ -16,12 +16,30 @@
 
 -module(emqx_gateway_api_clients).
 
--behaviour(minirest_api).
-
+-include("emqx_gateway_http.hrl").
+-include_lib("typerefl/include/types.hrl").
+-include_lib("hocon/include/hoconsc.hrl").
+-include_lib("emqx/include/emqx_placeholder.hrl").
 -include_lib("emqx/include/logger.hrl").
 
-%% minirest behaviour callbacks
--export([api_spec/0]).
+-behaviour(minirest_api).
+
+-import(hoconsc, [mk/2, ref/1, ref/2]).
+
+-import(emqx_gateway_http,
+        [ return_http_error/2
+        , with_gateway/2
+        ]).
+
+%% minirest/dashbaord_swagger behaviour callbacks
+-export([ api_spec/0
+        , paths/0
+        , schema/1
+        ]).
+
+-export([ roots/0
+        , fields/1
+        ]).
 
 %% http handlers
 -export([ clients/2
@@ -34,27 +52,18 @@
         , format_channel_info/1
         ]).
 
--import(emqx_gateway_http,
-        [ return_http_error/2
-        , with_gateway/2
-        , schema_bad_request/0
-        , schema_not_found/0
-        , schema_internal_error/0
-        , schema_no_content/0
-        ]).
-
 %%--------------------------------------------------------------------
 %% APIs
 %%--------------------------------------------------------------------
 
 api_spec() ->
-    {metadata(apis()), []}.
+    emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
-apis() ->
-    [ {"/gateway/:name/clients", clients}
-    , {"/gateway/:name/clients/:clientid", clients_insta}
-    , {"/gateway/:name/clients/:clientid/subscriptions", subscriptions}
-    , {"/gateway/:name/clients/:clientid/subscriptions/:topic", subscriptions}
+paths() ->
+    [ "/gateway/:name/clients"
+    , "/gateway/:name/clients/:clientid"
+    , "/gateway/:name/clients/:clientid/subscriptions"
+    , "/gateway/:name/clients/:clientid/subscriptions/:topic"
     ].
 
 -define(CLIENT_QS_SCHEMA,
@@ -88,13 +97,15 @@ clients(get, #{ bindings := #{name := Name0}
         TabName = emqx_gateway_cm:tabname(info, GwName),
         case maps:get(<<"node">>, Params, undefined) of
             undefined ->
-                Response = emqx_mgmt_api:cluster_query(Params, TabName,
+                Response = emqx_mgmt_api:cluster_query(
+                             Params, TabName,
                              ?CLIENT_QS_SCHEMA, ?query_fun),
                 emqx_mgmt_util:generate_response(Response);
             Node1 ->
                 Node = binary_to_atom(Node1, utf8),
                 ParamsWithoutNode = maps:without([<<"node">>], Params),
-                Response = emqx_mgmt_api:node_query(Node, ParamsWithoutNode,
+                Response = emqx_mgmt_api:node_query(
+                             Node, ParamsWithoutNode,
                              TabName, ?CLIENT_QS_SCHEMA, ?query_fun),
                 emqx_mgmt_util:generate_response(Response)
         end
@@ -105,7 +116,8 @@ clients_insta(get, #{ bindings := #{name := Name0,
                     }) ->
     ClientId = emqx_mgmt_util:urldecode(ClientId0),
     with_gateway(Name0, fun(GwName, _) ->
-        case emqx_gateway_http:lookup_client(GwName, ClientId,
+        case emqx_gateway_http:lookup_client(
+               GwName, ClientId,
                {?MODULE, format_channel_info}) of
             [ClientInfo] ->
                 {200, ClientInfo};
@@ -154,7 +166,8 @@ subscriptions(post, #{ bindings := #{name := Name0,
             {undefined, _} ->
                 return_http_error(400, "Miss topic property");
             {Topic, QoS} ->
-                case emqx_gateway_http:client_subscribe(GwName, ClientId, Topic, QoS) of
+                case emqx_gateway_http:client_subscribe(
+                       GwName, ClientId, Topic, QoS) of
                     {error, Reason} ->
                         return_http_error(404, Reason);
                     ok ->
@@ -204,7 +217,8 @@ query(Tab, {Qs, []}, Continuation, Limit) ->
 query(Tab, {Qs, Fuzzy}, Continuation, Limit) ->
     Ms = qs2ms(Qs),
     FuzzyFilterFun = fuzzy_filter_fun(Fuzzy),
-    emqx_mgmt_api:select_table_with_count(Tab, {Ms, FuzzyFilterFun}, Continuation, Limit,
+    emqx_mgmt_api:select_table_with_count(
+      Tab, {Ms, FuzzyFilterFun}, Continuation, Limit,
       fun format_channel_info/1).
 
 qs2ms(Qs) ->
@@ -218,8 +232,10 @@ qs2ms([{Key, '=:=', Value} | Rest], N, {MtchHead, Conds}) ->
     NMtchHead = emqx_mgmt_util:merge_maps(MtchHead, ms(Key, Value)),
     qs2ms(Rest, N, {NMtchHead, Conds});
 qs2ms([Qs | Rest], N, {MtchHead, Conds}) ->
-    Holder = binary_to_atom(iolist_to_binary(["$", integer_to_list(N)]), utf8),
-    NMtchHead = emqx_mgmt_util:merge_maps(MtchHead, ms(element(1, Qs), Holder)),
+    Holder = binary_to_atom(
+               iolist_to_binary(["$", integer_to_list(N)]), utf8),
+    NMtchHead = emqx_mgmt_util:merge_maps(
+                  MtchHead, ms(element(1, Qs), Holder)),
     NConds = put_conds(Qs, Holder, Conds),
     qs2ms(Rest, N+1, {NMtchHead, NConds}).
 
@@ -271,12 +287,14 @@ escape(B) when is_binary(B) ->
 
 run_fuzzy_filter(_, []) ->
     true;
-run_fuzzy_filter(E = {_, #{clientinfo := ClientInfo}, _}, [{Key, _, RE} | Fuzzy]) ->
+run_fuzzy_filter(E = {_, #{clientinfo := ClientInfo}, _},
+                 [{Key, _, RE} | Fuzzy]) ->
     Val = case maps:get(Key, ClientInfo, "") of
               undefined -> "";
               V -> V
           end,
-    re:run(Val, RE, [{capture, none}]) == match andalso run_fuzzy_filter(E, Fuzzy).
+    re:run(Val, RE, [{capture, none}]) == match
+      andalso run_fuzzy_filter(E, Fuzzy).
 
 %%--------------------------------------------------------------------
 %% format funcs
@@ -294,15 +312,19 @@ format_channel_info({_, Infos, Stats} = R) ->
              , {port, {peername, ConnInfo, fun peer_to_port/1}}
              , {is_bridge, ClientInfo, false}
              , {connected_at,
-                {connected_at, ConnInfo, fun emqx_gateway_utils:unix_ts_to_rfc3339/1}}
+                {connected_at, ConnInfo,
+                 fun emqx_gateway_utils:unix_ts_to_rfc3339/1}}
              , {disconnected_at,
-                {disconnected_at, ConnInfo, fun emqx_gateway_utils:unix_ts_to_rfc3339/1}}
-             , {connected, {conn_state, Infos, fun conn_state_to_connected/1}}
+                {disconnected_at, ConnInfo,
+                 fun emqx_gateway_utils:unix_ts_to_rfc3339/1}}
+             , {connected, {conn_state, Infos,
+                            fun conn_state_to_connected/1}}
              , {keepalive, ClientInfo, 0}
              , {clean_start, ConnInfo, true}
              , {expiry_interval, ConnInfo, 0}
              , {created_at,
-                {created_at, SessInfo, fun emqx_gateway_utils:unix_ts_to_rfc3339/1}}
+                {created_at, SessInfo,
+                 fun emqx_gateway_utils:unix_ts_to_rfc3339/1}}
              , {subscriptions_cnt, Stats, 0}
              , {subscriptions_max, Stats, infinity}
              , {inflight_cnt, Stats, 0}
@@ -384,275 +406,338 @@ conn_state_to_connected(_) -> false.
 %% Swagger defines
 %%--------------------------------------------------------------------
 
-metadata(APIs) ->
-    metadata(APIs, []).
-metadata([], APIAcc) ->
-    lists:reverse(APIAcc);
-metadata([{Path, Fun} | More], APIAcc) ->
-    Methods = [get, post, put, delete, patch],
-    Mds = lists:foldl(fun(M, Acc) ->
-              try
-                  Acc#{M => swagger(Path, M)}
-              catch
-                  error : function_clause ->
-                      Acc
-              end
-          end, #{}, Methods),
-    metadata(More, [{Path, Mds, Fun} | APIAcc]).
-
-swagger("/gateway/:name/clients", get) ->
-    #{ description => <<"Get the gateway clients">>
+schema("/gateway/:name/clients") ->
+    #{ 'operationId' => clients
+     , get =>
+        #{ description => <<"Get the gateway client list">>
          , parameters => params_client_query()
          , responses =>
-        #{ <<"400">> => schema_bad_request()
-         , <<"404">> => schema_not_found()
-         , <<"500">> => schema_internal_error()
-         , <<"200">> => schema_clients_list()
+            ?STANDARD_RESP(
+               #{ 200 => emqx_dashboard_swagger:schema_with_examples(
+                           hoconsc:array(ref(client)),
+                           examples_client_list())})
          }
      };
-swagger("/gateway/:name/clients/:clientid", get) ->
+schema("/gateway/:name/clients/:clientid") ->
+    #{ 'operationId' => clients_insta
+     , get =>
         #{ description => <<"Get the gateway client infomation">>
          , parameters => params_client_insta()
          , responses =>
-        #{ <<"400">> => schema_bad_request()
-         , <<"404">> => schema_not_found()
-         , <<"500">> => schema_internal_error()
-         , <<"200">> => schema_client()
+            ?STANDARD_RESP(
+               #{ 200 => emqx_dashboard_swagger:schema_with_examples(
+                           ref(client),
+                           examples_client())})
          }
-     };
-swagger("/gateway/:name/clients/:clientid", delete) ->
+     , delete =>
         #{ description => <<"Kick out the gateway client">>
          , parameters => params_client_insta()
          , responses =>
-        #{ <<"400">> => schema_bad_request()
-         , <<"404">> => schema_not_found()
-         , <<"500">> => schema_internal_error()
-         , <<"204">> => schema_no_content()
+            ?STANDARD_RESP(#{204 => <<"Kicked">>})
          }
      };
-swagger("/gateway/:name/clients/:clientid/subscriptions", get) ->
+schema("/gateway/:name/clients/:clientid/subscriptions") ->
+    #{ 'operationId' => subscriptions
+     , get =>
         #{ description => <<"Get the gateway client subscriptions">>
          , parameters => params_client_insta()
          , responses =>
-        #{ <<"400">> => schema_bad_request()
-         , <<"404">> => schema_not_found()
-         , <<"500">> => schema_internal_error()
-         , <<"200">> => schema_subscription_list()
+            ?STANDARD_RESP(
+               #{ 200 => emqx_dashboard_swagger:schema_with_examples(
+                           hoconsc:array(ref(subscription)),
+                           examples_subsctiption_list())})
          }
-     };
-swagger("/gateway/:name/clients/:clientid/subscriptions", post) ->
-    #{ description => <<"Get the gateway client subscriptions">>
+     , post =>
+        #{ description => <<"Create a subscription membership">>
          , parameters => params_client_insta()
-     , requestBody => schema_subscription()
+         %% FIXME:
+         , requestBody => emqx_dashboard_swagger:schema_with_examples(
+                            ref(subscription),
+                            examples_subsctiption())
          , responses =>
-        #{ <<"400">> => schema_bad_request()
-         , <<"404">> => schema_not_found()
-         , <<"500">> => schema_internal_error()
-         , <<"204">> => schema_no_content()
+            ?STANDARD_RESP(
+               #{ 201 => emqx_dashboard_swagger:schema_with_examples(
+                           ref(subscription),
+                           examples_subsctiption())})
          }
      };
-swagger("/gateway/:name/clients/:clientid/subscriptions/:topic", delete) ->
-    #{ description => <<"Unsubscribe the topic for client">>
+schema("/gateway/:name/clients/:clientid/subscriptions/:topic") ->
+    #{ 'operationId' => subscriptions
+     , delete =>
+        #{ description => <<"Delete a subscriptions membership">>
          , parameters => params_topic_name_in_path() ++ params_client_insta()
          , responses =>
-        #{ <<"400">> => schema_bad_request()
-         , <<"404">> => schema_not_found()
-         , <<"500">> => schema_internal_error()
-         , <<"204">> => schema_no_content()
+            ?STANDARD_RESP(#{204 => <<"Unsubscribed">>})
          }
      }.
 
 params_client_query() ->
     params_gateway_name_in_path()
     ++ params_client_searching_in_qs()
-    ++ emqx_mgmt_util:page_params().
+    ++ params_paging().
 
 params_client_insta() ->
     params_clientid_in_path()
     ++ params_gateway_name_in_path().
 
 params_client_searching_in_qs() ->
-    queries(
-      [ {node, string}
-      , {clientid, string}
-      , {username, string}
-      , {ip_address, string}
-      , {conn_state, string}
-      , {proto_ver, string}
-      , {clean_start, boolean}
-      , {like_clientid, string}
-      , {like_username, string}
-      , {gte_created_at, string}
-      , {lte_created_at, string}
-      , {gte_connected_at, string}
-      , {lte_connected_at, string}
-    ]).
+    M = #{in => query, nullable => true},
+    [ {node,
+       mk(binary(),
+          M#{desc => <<"Match the client's node name">>})}
+    , {clientid,
+       mk(binary(),
+          M#{desc => <<"Match the client's ID">>})}
+    , {username,
+       mk(binary(),
+          M#{desc => <<"Match the client's Username">>})}
+    , {ip_address,
+       mk(binary(),
+          M#{desc => <<"Match the client's ip address">>})}
+    , {conn_state,
+       mk(binary(),
+          M#{desc => <<"Match the client's connection state">>})}
+    , {proto_ver,
+       mk(binary(),
+          M#{desc => <<"Match the client's protocol version">>})}
+    , {clean_start,
+       mk(boolean(),
+          M#{desc => <<"Match the client's clean start flag">>})}
+    , {like_clientid,
+       mk(binary(),
+          M#{desc => <<"Use sub-string to match client's ID">>})}
+    , {like_username,
+       mk(binary(),
+          M#{desc => <<"Use sub-string to match client's username">>})}
+    , {gte_created_at,
+       mk(binary(),
+          M#{desc => <<"Match the session created datetime greater than "
+                       "a certain value">>})}
+    , {lte_created_at,
+       mk(binary(),
+          M#{desc => <<"Match the session created datetime less than "
+                       "a certain value">>})}
+    , {gte_connected_at,
+       mk(binary(),
+          M#{desc => <<"Match the client socket connected datetime greater "
+                       "than a certain value">>})}
+    , {lte_connected_at,
+       mk(binary(),
+          M#{desc => <<"Match the client socket connected datatime less than "
+                       " a certain value">>})}
+    ].
+
+params_paging() ->
+    [ {page,
+       mk(integer(),
+          #{ in => query
+           , nullable => true
+           , desc => <<"Page Index">>})}
+      , {limit,
+         mk(integer(),
+            #{ in => query
+             , desc => <<"Page Limit">>
+             , nullable => true})}
+    ].
 
 params_gateway_name_in_path() ->
-    [#{ name => name
-      , in => path
-      , schema => #{type => string}
-      , required => true
-      }].
+    [{name,
+      mk(binary(),
+         #{ in => path
+          , desc => <<"Gateway Name">>
+          })}
+    ].
 
 params_clientid_in_path() ->
-    [#{ name => clientid
-      , in => path
-      , schema => #{type => string}
-      , required => true
-      }].
+    [{clientid,
+      mk(binary(),
+         #{ in => path
+          , desc => <<"Client ID">>
+          })}
+    ].
 
 params_topic_name_in_path() ->
-    [#{ name => topic
-      , in => path
-      , schema => #{type => string}
-      , required => true
-      }].
-
-queries(Ls) ->
-    lists:map(fun({K, Type}) ->
-        #{name => K, in => query,
-          schema => #{type => Type},
-          required => false
-         }
-    end, Ls).
+    [{topic,
+      mk(binary(),
+         #{ in => path
+          , desc => <<"Topic Filter/Name">>
+          })}
+    ].
 
 %%--------------------------------------------------------------------
 %% schemas
 
-schema_clients_list() ->
-    emqx_mgmt_util:page_schema(
-      #{ type => object
-       , properties => properties_client()
-       }
-     ).
+roots() ->
+    [ client
+    , subscription
+    ].
 
-schema_client() ->
-    emqx_mgmt_util:schema(
-    #{ type => object
-     , properties => properties_client()
-     }).
-
-schema_subscription_list() ->
-    emqx_mgmt_util:array_schema(
-      #{ type => object
-       , properties => properties_subscription()
-       },
-      <<"Client subscriptions">>
-     ).
-
-schema_subscription() ->
-    emqx_mgmt_util:schema(
-      #{ type => object
-       , properties => properties_subscription()
-       }
-     ).
-
-%%--------------------------------------------------------------------
-%% properties defines
-
-properties_client() ->
-    %% FIXME: enum for every protocol's client
-    emqx_mgmt_util:properties(
-      [ {node, string,
-         <<"Name of the node to which the client is connected">>}
-      , {clientid, string,
-         <<"Client identifier">>}
-      , {username, string,
-         <<"Username of client when connecting">>}
-      , {proto_name, string,
-         <<"Client protocol name">>}
-      , {proto_ver, string,
-         <<"Protocol version used by the client">>}
-      , {ip_address, string,
-         <<"Client's IP address">>}
-      , {port, integer,
-         <<"Client's port">>}
-      , {is_bridge, boolean,
-         <<"Indicates whether the client is connectedvia bridge">>}
-      , {connected_at, string,
-         <<"Client connection time">>}
-      , {disconnected_at, string,
-         <<"Client offline time, This field is only valid and returned "
-            "when connected is false">>}
-      , {connected, boolean,
-         <<"Whether the client is connected">>}
+fields(client) ->
+    %% XXX: enum for every protocol's client
+    [ {node,
+       mk(string(),
+          #{ desc => <<"Name of the node to which the client is "
+                       "connected">>})}
+    , {clientid,
+       mk(string(),
+          #{ desc => <<"Client identifier">>})}
+    , {username,
+       mk(string(),
+          #{ desc => <<"Username of client when connecting">>})}
+    , {proto_name,
+       mk(string(),
+          #{ desc => <<"Client protocol name">>})}
+    , {proto_ver,
+       mk(string(),
+          #{ desc => <<"Protocol version used by the client">>})}
+    , {ip_address,
+       mk(string(),
+          #{ desc => <<"Client's IP address">>})}
+    , {port,
+       mk(integer(),
+          #{ desc => <<"Client's port">>})}
+    , {is_bridge,
+       mk(boolean(),
+          #{ desc => <<"Indicates whether the client is connected via "
+                       "bridge">>})}
+    , {connected_at,
+       mk(string(),
+          #{ desc => <<"Client connection time">>})}
+    , {disconnected_at,
+       mk(string(),
+          #{ desc => <<"Client offline time, This field is only valid and "
+                       "returned when connected is false">>})}
+    , {connected,
+       mk(boolean(),
+          #{ desc => <<"Whether the client is connected">>})}
     %% FIXME: the will_msg attribute is not a general attribute
     %% for every protocol. But it should be returned to frontend if someone
     %% want it
     %%
-      %, {will_msg, string,
-      %   <<"Client will message">>}
-      %, {zone, string,
-      %   <<"Indicate the configuration group used by the client">>}
-      , {keepalive, integer,
-         <<"keepalive time, with the unit of second">>}
-      , {clean_start, boolean,
-         <<"Indicate whether the client is using a brand new session">>}
-      , {expiry_interval, integer,
-         <<"Session expiration interval, with the unit of second">>}
-      , {created_at, string,
-         <<"Session creation time">>}
-      , {subscriptions_cnt, integer,
-         <<"Number of subscriptions established by this client">>}
-      , {subscriptions_max, integer,
-         <<"v4 api name [max_subscriptions] Maximum number of "
-           "subscriptions allowed by this client">>}
-      , {inflight_cnt, integer,
-         <<"Current length of inflight">>}
-      , {inflight_max, integer,
-         <<"v4 api name [max_inflight]. Maximum length of inflight">>}
-      , {mqueue_len, integer,
-         <<"Current length of message queue">>}
-      , {mqueue_max, integer,
-         <<"v4 api name [max_mqueue]. Maximum length of message queue">>}
-      , {mqueue_dropped, integer,
-         <<"Number of messages dropped by the message queue due to "
-           "exceeding the length">>}
-      , {awaiting_rel_cnt, integer,
-         <<"v4 api name [awaiting_rel] Number of awaiting PUBREC packet">>}
-      , {awaiting_rel_max, integer,
-         <<"v4 api name [max_awaiting_rel]. Maximum allowed number of "
-           "awaiting PUBREC packet">>}
-      , {recv_oct, integer,
-         <<"Number of bytes received by EMQ X Broker (the same below)">>}
-      , {recv_cnt, integer,
-         <<"Number of TCP packets received">>}
-      , {recv_pkt, integer,
-         <<"Number of MQTT packets received">>}
-      , {recv_msg, integer,
-         <<"Number of PUBLISH packets received">>}
-      , {send_oct, integer,
-         <<"Number of bytes sent">>}
-      , {send_cnt, integer,
-         <<"Number of TCP packets sent">>}
-      , {send_pkt, integer,
-         <<"Number of MQTT packets sent">>}
-      , {send_msg, integer,
-         <<"Number of PUBLISH packets sent">>}
-      , {mailbox_len, integer,
-         <<"Process mailbox size">>}
-      , {heap_size, integer,
-         <<"Process heap size with the unit of byte">>}
-      , {reductions, integer,
-         <<"Erlang reduction">>}
-      ]).
+    %, {will_msg,
+    %   mk(string(),
+    %      #{ desc => <<"Client will message">>})}
+    %, {zone,
+    %   mk(string(),
+    %      #{ desc => <<"Indicate the configuration group used by the "
+    %                   "client">>})}
+    , {keepalive,
+       mk(integer(),
+          #{ desc => <<"keepalive time, with the unit of second">>})}
+    , {clean_start,
+       mk(boolean(),
+          #{ desc => <<"Indicate whether the client is using a brand "
+                        "new session">>})}
+    , {expiry_interval,
+       mk(integer(),
+          #{ desc => <<"Session expiration interval, with the unit of "
+                       "second">>})}
+    , {created_at,
+       mk(string(),
+          #{ desc => <<"Session creation time">>})}
+    , {subscriptions_cnt,
+       mk(integer(),
+          #{ desc => <<"Number of subscriptions established by this "
+                       "client">>})}
+    , {subscriptions_max,
+       mk(integer(),
+          #{ desc => <<"Maximum number of subscriptions allowed by this "
+                       "client">>})}
+    , {inflight_cnt,
+       mk(integer(),
+          #{ desc => <<"Current length of inflight">>})}
+    , {inflight_max,
+       mk(integer(),
+          #{ desc => <<"Maximum length of inflight">>})}
+    , {mqueue_len,
+       mk(integer(),
+          #{ desc => <<"Current length of message queue">>})}
+    , {mqueue_max,
+       mk(integer(),
+          #{ desc => <<"Maximum length of message queue">>})}
+    , {mqueue_dropped,
+       mk(integer(),
+          #{ desc => <<"Number of messages dropped by the message queue "
+                       "due to exceeding the length">>})}
+    , {awaiting_rel_cnt,
+       mk(integer(),
+          #{ desc => <<"Number of awaiting PUBREC packet">>})}
+    , {awaiting_rel_max,
+       mk(integer(),
+          #{ desc => <<"Maximum allowed number of awaiting PUBREC "
+                       "packet">>})}
+    , {recv_oct,
+       mk(integer(),
+          #{ desc => <<"Number of bytes received by EMQ X Broker">>})}
+    , {recv_cnt,
+       mk(integer(),
+          #{ desc => <<"Number of TCP packets received">>})}
+    , {recv_pkt,
+       mk(integer(),
+          #{ desc => <<"Number of MQTT packets received">>})}
+    , {recv_msg,
+       mk(integer(),
+          #{ desc => <<"Number of PUBLISH packets received">>})}
+    , {send_oct,
+       mk(integer(),
+          #{ desc => <<"Number of bytes sent">>})}
+    , {send_cnt,
+       mk(integer(),
+          #{ desc => <<"Number of TCP packets sent">>})}
+    , {send_pkt,
+       mk(integer(),
+          #{ desc => <<"Number of MQTT packets sent">>})}
+    , {send_msg,
+       mk(integer(),
+          #{ desc => <<"Number of PUBLISH packets sent">>})}
+    , {mailbox_len,
+       mk(integer(),
+          #{ desc => <<"Process mailbox size">>})}
+    , {heap_size,
+       mk(integer(),
+          #{ desc => <<"Process heap size with the unit of byte">>})}
+    , {reductions,
+       mk(integer(),
+          #{ desc => <<"Erlang reduction">>})}
+    ];
+fields(subscription) ->
+    [ {topic,
+       mk(string(),
+          #{ desc => <<"Topic Fillter">>})}
+    , {qos,
+       mk(integer(),
+          #{ desc => <<"QoS level, enum: 0, 1, 2">>})}
+    , {nl,
+       mk(integer(),     %% FIXME: why not boolean?
+          #{ desc => <<"No Local option, enum: 0, 1">>})}
+    , {rap,
+       mk(integer(),
+          #{ desc => <<"Retain as Published option, enum: 0, 1">>})}
+    , {rh,
+       mk(integer(),
+          #{ desc => <<"Retain Handling option, enum: 0, 1, 2">>})}
+    , {sub_props,
+       mk(ref(extra_sub_props),
+         #{desc => <<"Subscription properties">>})}
+    ];
+fields(extra_sub_props) ->
+    [ {subid,
+       mk(string(),
+         #{ desc => <<"Only stomp protocol, an uniquely identity for "
+                      "the subscription. range: 1-65535.">>})}
+    ].
 
-properties_subscription() ->
-    ExtraProps = [ {subid, string,
-                    <<"Only stomp protocol, an uniquely identity for "
-                      "the subscription. range: 1-65535.">>}
-                 ],
-    emqx_mgmt_util:properties(
-     [ {topic, string,
-        <<"Topic Fillter">>}
-     , {qos, integer,
-        <<"QoS level, enum: 0, 1, 2">>}
-     , {nl, integer,     %% FIXME: why not boolean?
-        <<"No Local option, enum: 0, 1">>}
-     , {rap, integer,
-        <<"Retain as Published option, enum: 0, 1">>}
-     , {rh, integer,
-        <<"Retain Handling option, enum: 0, 1, 2">>}
-     , {sub_props, object, ExtraProps}
-     ]).
+%%--------------------------------------------------------------------
+%% examples
+
+examples_client_list() ->
+    #{}.
+
+examples_client() ->
+    #{}.
+
+examples_subsctiption_list() ->
+    #{}.
+
+examples_subsctiption() ->
+    #{}.

apps/emqx_gateway/src/emqx_gateway_api_listeners.erl

@@ -225,7 +225,7 @@ schema("/gateway/:name/listeners") ->
           , parameters => params_gateway_name_in_path()
           , responses =>
               ?STANDARD_RESP(
-                 #{ 200 => emqx_dashboard_swagger:schema_with_examples(
+                 #{ 200 => emqx_dashboard_swagger:schema_with_example(
                              hoconsc:array(ref(listener)),
                              examples_listener_list())
                   })
@@ -240,7 +240,7 @@ schema("/gateway/:name/listeners") ->
               ?STANDARD_RESP(
                  #{ 201 => emqx_dashboard_swagger:schema_with_examples(
                              ref(listener),
-                             examples_listener_list())
+                             examples_listener())
                   })
           }
      };
@@ -580,7 +580,96 @@ common_listener_opts() ->
 %% examples
 
 examples_listener_list() ->
-    #{stomp_listeners => [examples_listener()]}.
+    [Config || #{value := Config} <- maps:values(examples_listener())].
 
 examples_listener() ->
-    #{}.
+    #{ tcp_listener=>
+        #{ summary => <<"A simple tcp listener example">>
+         , value =>
+            #{ bind => <<"61613">>
+             , acceptors => 16
+             , max_connections => 1024000
+             , max_conn_rate => 1000
+             , tcp =>
+                #{ active_n => 100
+                 , backlog => 1024
+                 , send_timeout => <<"15s">>
+                 , send_timeout_close => true
+                 , recbuf => <<"10KB">>
+                 , sndbuf => <<"10KB">>
+                 , buffer => <<"10KB">>
+                 , high_watermark => <<"1MB">>
+                 , nodelay => false
+                 , reuseaddr => true
+                 }
+             }
+         }
+     , ssl_listener =>
+        #{ summary => <<"A simple ssl listener example">>
+         , value =>
+            #{ bind => <<"61614">>
+             , acceptors => 16
+             , max_connections => 1024000
+             , max_conn_rate => 1000
+             , access_rules => [<<"allow all">>]
+             , ssl =>
+                #{ versions => [<<"tlsv1.3">>, <<"tlsv1.2">>,
+                                <<"tlsv1.1">>, <<"tlsv1">>]
+                 , cacertfile => <<"etc/certs/cacert.pem">>
+                 , certfile => <<"etc/certs/cert.pem">>
+                 , keyfile => <<"etc/certs/key.pem">>
+                 , verify => <<"verify_none">>
+                 , fail_if_no_peer_cert => false
+                 , server_name_indication => disable
+                 }
+             , tcp =>
+                #{ active_n => 100
+                 , backlog => 1024
+                 }
+             }
+         }
+     , udp_listener =>
+        #{ summary => <<"A simple udp listener example">>
+         , value =>
+            #{ bind => <<"0.0.0.0:1884">>
+             , udp =>
+                #{ active_n => 100
+                 , recbuf => <<"10KB">>
+                 , sndbuf => <<"10KB">>
+                 , buffer => <<"10KB">>
+                 , reuseaddr => true
+                 }
+             }
+         }
+     , dtls_listener =>
+        #{ summary => <<"A simple dtls listener example">>
+         , value =>
+            #{ bind => <<"5684">>
+             , acceptors => 16
+             , max_connections => 1024000
+             , max_conn_rate => 1000
+             , access_rules => [<<"allow all">>]
+             , ssl =>
+                #{ versions => [<<"dtlsv1.2">>, <<"dtlsv1">>]
+                 , cacertfile => <<"etc/certs/cacert.pem">>
+                 , certfile => <<"etc/certs/cert.pem">>
+                 , keyfile => <<"etc/certs/key.pem">>
+                 , verify => <<"verify_none">>
+                 , fail_if_no_peer_cert => false
+                 , server_name_indication => disable
+                 }
+             , tcp =>
+                #{ active_n => 100
+                 , backlog => 1024
+                 }
+             }
+         }
+     , dtls_listener_with_psk_ciphers =>
+        #{ summary => <<"todo">>
+         , value =>
+            #{}
+         }
+     , lisetner_with_authn =>
+        #{ summary => <<"todo">>
+         , value => #{}}
+     }.

apps/emqx_gateway/src/emqx_gateway_schema.erl

@@ -143,9 +143,9 @@ The client just sends its PUBLISH messages to a GW"
        sc(hoconsc:array(ref(mqttsn_predefined)),
           #{ default => []
            , desc =>
-"The Pre-defined topic ids and topic names.<br>
+<<"The Pre-defined topic ids and topic names.<br>
 A 'pre-defined' topic id is a topic id whose mapping to a topic name
-is known in advance by both the client's application and the gateway"
+is known in advance by both the client’s application and the gateway">>
            })}
     , {listeners, sc(ref(udp_listeners))}
     ] ++ gateway_common_options();