Various features

rebar.config

@@ -44,3 +44,9 @@
 {xref_checks,[undefined_function_calls,undefined_functions,locals_not_used,
               deprecated_function_calls,
               deprecated_functions]}.
+
+{dialyzer, [
+    {plt_apps, all_apps},
+    {extra_plt_apps, [lee, typerefl, ssl, stdlib]},
+    {statistics, true}
+]}.

src/behaviors/emqttb_behavior_pub.erl

@@ -42,6 +42,7 @@
                    , retain         => boolean()
                    , metadata       => boolean()
                    , host_shift     => integer()
+                   , random         => boolean()
                    , host_selection => random | round_robin
                    , clean_start    => boolean()
                    , expiry         => non_neg_integer() | undefined
@@ -97,13 +98,16 @@ init_per_group(Group,
   HostShift = maps:get(host_shift, Conf, 0),
   HostSelection = maps:get(host_selection, Conf, random),
   Retain = maps:get(retain, Conf, false),
+  Size = max(0, MsgSize - MetadataSize),
   #{ topic => Topic
-   , message => message(max(0, MsgSize - MetadataSize))
+   , message => message(Size)
+   , size => Size
    , pub_opts => [{qos, QoS}, {retain, Retain}]
    , pubinterval => PubRate
    , metadata => AddMetadata
    , host_shift => HostShift
    , host_selection => HostSelection
+   , random => maps:get(random, Conf, false)
    , expiry => maps:get(expiry, Conf, undefined)
    , clean_start => maps:get(clean_start, Conf, true)
    , pub_opstat => emqttb_metrics:opstat_from_model(MetricsKey ++ [pub_latency])
@@ -131,12 +135,15 @@ handle_message(Shared, Conn, {publish, N1}) ->
    , pub_counter := PubCounter
    , pub_opstat := PubOpstat
    , metadata := AddMetadata
+   , random := Random
+   , size := Size
    } = Shared,
   {SleepTime, N2} = emqttb:get_duration_and_repeats(I),
   send_after(SleepTime, {publish, N2}),
-  Msg = case AddMetadata of
-          true  -> [message_metadata(), Msg0];
-          false -> Msg0
+  Msg = if AddMetadata andalso Random -> [message_metadata(), rand:bytes(Size)];
+           Random -> rand:bytes(Size);
+           AddMetadata -> [message_metadata(), Msg0];
+           true -> Msg0
         end,
   T = emqttb_worker:format_topic(TP),
   repeat(N1, fun() ->

src/conf/emqttb_conf_model.erl

@@ -179,6 +179,20 @@ model() ->
                    , type        => union(false, string())
                    , default     => false
                    }}
+             , motto =>
+                 {[value, os_env, cli_param],
+                  #{ oneliner    => "Add Grafana annotation at the end of the run"
+                   , type        => string()
+                   , default     => ""
+                   , cli_operand => "motto"
+                   }}
+             , motto_tags =>
+                 {[value, os_env, cli_param],
+                  #{ oneliner    => "Custom tags added to the Grafana annotation span"
+                   , type        => emqttb_grafana:tags()
+                   , default     => []
+                   , cli_operand => "motto-tags"
+                   }}
              }
         }
    , convenience =>

src/emqttb.erl

@@ -75,9 +75,11 @@
 -type ifaddr_list() :: list(typerefl:ip_address()).
 -typerefl_from_string({ifaddr_list/0, ?MODULE, parse_addresses}).
 
+-type n_cycles() :: non_neg_integer() | undefined.
+
 -reflect_type([scenario/0, stage/0, group/0, transport/0, proto_ver/0, qos/0,
                net_port/0, hosts/0, ifaddr_list/0, ssl_verify/0, host_selection/0,
-               duration_ms/0, duration_us/0, duration_s/0, byte_size/0]).
+               duration_ms/0, duration_us/0, duration_s/0, byte_size/0, n_cycles/0]).
 
 %%================================================================================
 %% API funcions
@@ -87,6 +89,7 @@
 -spec main([string()]) -> no_return().
 main(Args) ->
   application:set_env(emqttb, cli_args, Args),
+  application:set_env(emqttb, start_time, os:system_time(millisecond)),
   {ok, _} = application:ensure_all_started(?APP, permanent),
   %% Wait for completion of the scenarios:
   MRef = monitor(process, whereis(emqttb_scenarios_sup)),
@@ -133,6 +136,7 @@ get_duration_and_repeats(CRef) ->
 
 -spec terminate() -> no_return().
 terminate() ->
+  annotate_run(),
   case application:get_env(emqttb, is_fail, false) of
     false ->
       timer:sleep(100), %% Ugly: give logger time to flush events...
@@ -144,6 +148,11 @@ terminate() ->
       halt(1)
   end.
 
+annotate_run() ->
+  Motto = ?CFG([metrics, grafana, motto]),
+  Tags = ?CFG([metrics, grafana, motto_tags]),
+  emqttb_grafana:annotate_range(Motto, Tags, application:get_env(emqttb, start_time, 0), os:system_time(millisecond)).
+
 parse_addresses(Str) ->
   L = [inet:parse_address(I) || I <- string:tokens(Str, ", ")],
   case lists:keyfind(error, 1, L) of

src/framework/emqttb_group.erl

@@ -64,8 +64,8 @@ stop(ID) ->
   logger:info("Stopping group ~p", [ID]),
   emqttb_group_sup:stop(ID).
 
--spec set_target(emqttb:group(), NClients) -> NClients
-          when NClients :: emqttb:n_cycles().
+-spec set_target(emqttb:group(), NClients) -> {ok, NClients} | {error, new_target}
+          when NClients :: emqttb:n_clients().
 set_target(Group, NClients) ->
   set_target(Group, NClients, undefined).
 
@@ -81,7 +81,7 @@ set_target(Group, NClients) ->
 %%
 %% Order of workers' removal during ramping down is not specified.
 -spec set_target(emqttb:group(), NClients, emqttb:interval() | undefined) ->
-             {ok, NClients} | {error, new_target | {ratelimited, atom(), NClients}}
+             {ok, NClients} | {error, new_target}
           when NClients :: emqttb:n_clients().
 set_target(Id, Target, Interval) ->
   gen_server:call(?via(Id), {set_target, Target, Interval}, infinity).

src/framework/emqttb_worker.erl

@@ -138,7 +138,7 @@ my_hostname() ->
 connect(ConnOpstat, Properties) ->
   connect(ConnOpstat, Properties, [], [], []).
 
--spec connect(emqttb_metrics:metric_ref(), map(), [emqtt:option()], [gen_tcp:option()], [ssl:option()]) -> gen_statem:start_ret().
+-spec connect(emqttb_metrics:metric_ref(), map(), [emqtt:option()], [gen_tcp:option()], [ssl:tls_option()]) -> gen_statem:start_ret().
 connect(ConnOpstat, Properties0, CustomOptions, CustomTcpOptions, CustomSslOptions) ->
   HostShift = maps:get(host_shift, Properties0, 0),
   HostSelection = maps:get(host_selection, Properties0, random),
@@ -172,7 +172,7 @@ connect(ConnOpstat, Properties0, CustomOptions, CustomTcpOptions, CustomSslOptio
 %% Internal exports
 %%================================================================================
 
--spec entrypoint(module(), emqttb:group_id(), integer()) -> no_return().
+-spec entrypoint(module(), emqttb:group(), integer()) -> no_return().
 entrypoint(Behavior, Group, Number) ->
   %% We need to trap exits to make sure the counter is decremented in
   %% the end.

src/metrics/emqttb_grafana.erl

@@ -16,24 +16,45 @@
 -module(emqttb_grafana).
 
 %% API:
--export([annotate/2, annotate/1]).
+-export([annotate/2, annotate/1, annotate_range/4]).
+
+-export([parse_comma_separated/1]).
 
 -include("emqttb.hrl").
+-include_lib("typerefl/include/types.hrl").
 
 %%================================================================================
-%% API funcions
+%% Type declarations
+%%================================================================================
+
+-type tags() :: [string()].
+-typerefl_from_string({tags/0, ?MODULE, parse_comma_separated}).
+
+-reflect_type([tags/0]).
+
+%%================================================================================
+%% API functions
 %%================================================================================
 
 -spec annotate(iolist()) -> ok.
 annotate(Text) ->
   annotate(Text, []).
 
+-spec annotate_range(iolist(), [string()], integer(), integer()) -> ok.
+annotate_range(Text, Tags, Time, TimeEnd) ->
+  Range = #{time => Time, 'timeEnd' => TimeEnd},
+  annotate(Text, Tags, Range).
+
 -spec annotate(iolist(), [atom() | string()]) -> ok.
 annotate(Text, Tags0) ->
+  annotate(Text, Tags0, #{}).
+
+-spec annotate(iolist(), [atom() | string()], map()) -> ok.
+annotate(Text, Tags0, Data) ->
   case ?CFG([metrics, grafana, enabled]) of
     true ->
       Tags = lists:map(fun ensure_string/1, Tags0),
-      spawn(fun() -> do_annotate(Text, Tags) end),
+      spawn(fun() -> do_annotate(Text, Tags, Data) end),
       ok;
     false ->
       ok
@@ -43,7 +64,7 @@ annotate(Text, Tags0) ->
 %% Internal functions
 %%================================================================================
 
-do_annotate(Text, Tags) ->
+do_annotate(Text, Tags, Data0) ->
   Url = ?CFG([metrics, grafana, url]) ++ "/api/annotations",
   AuthToken = case ?CFG([metrics, grafana, api_key]) of
                 false -> [];
@@ -54,9 +75,9 @@ do_annotate(Text, Tags) ->
               false -> [];
               Login -> [{basic_auth, {Login, ?CFG([metrics, grafana, password])}}]
             end,
-  Data = #{ text => iolist_to_binary(Text)
-          , tags => [<<"emqttb">>, <<"mqtt">> | Tags]
-          },
+  Data = Data0#{ text => iolist_to_binary(Text)
+               , tags => [<<"emqttb">>, <<"mqtt">> | Tags]
+               },
   {ok, Code, _RespHeaders, ClientRef} = hackney:post(Url, Headers, jsone:encode(Data), Options),
   case Code of
     200 ->
@@ -69,4 +90,7 @@ do_annotate(Text, Tags) ->
 ensure_string(Atom) when is_atom(Atom) ->
   atom_to_binary(Atom);
 ensure_string(Str) ->
-  Str.
+  list_to_binary(Str).
+
+parse_comma_separated(Str) ->
+  {ok, string:tokens(Str, ",")}.

src/scenarios/emqttb_scenario_persistent_session.erl

@@ -252,6 +252,7 @@ publish_stage(S = #s{produced = NPub0, pubinterval = PubInterval}) ->
              , qos         => my_conf([pub, qos])
              , metrics     => my_conf_key([pub, metrics])
              , metadata    => true
+             , random      => true
              },
   emqttb_group:ensure(#{ id            => ?PUB_GROUP
                        , client_config => my_conf([group])

src/scenarios/emqttb_scenario_pub.erl

@@ -74,6 +74,13 @@ model() ->
          , cli_short => $s
          , default => 256
          }}
+   , random =>
+       {[value, cli_param],
+        #{ oneliner => "Randomize message contents"
+         , type => boolean()
+         , cli_operand => "random"
+         , default => false
+         }}
    , conninterval =>
        {[value, cli_param, autorate],
         #{ oneliner => "Client connection interval (microsecond)"

src/scenarios/emqttb_scenario_sub_flapping.erl

@@ -37,10 +37,6 @@
 %% Type declarations
 %%================================================================================
 
--type n_cycles() :: non_neg_integer() | undefined.
-
--reflect_type([n_cycles/0]).
-
 -define(GROUP, sub).
 
 %%================================================================================
@@ -105,7 +101,7 @@ model() ->
          }}
    , n_cycles =>
        {[value, cli_param],
-        #{ type => n_cycles()
+        #{ type => emqttb:n_cycles()
          , default => 10
          , cli_operand => "cycles"
          , cli_short => $C