a2c658ba19
* Add acking mechamism for shared dispatch For QoS0 messages, no acking For QoS1/2 messages, 'ACK' at any of events below: - ACK when QoS is downgraded to 0 - Message is sent to connection process 'NACK' at any of events below: - Message queue is full and the receiving session starts to drop old messages - The receiving session crash Upon 'NACK', messages are dispatched to the 'next' subscriber in the group, depending on the shared subscription dispatch strategy.
100 lines
3.2 KiB
Erlang
100 lines
3.2 KiB
Erlang
%% Copyright (c) 2018 EMQ Technologies Co., Ltd. All Rights Reserved.
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%%
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%% Licensed under the Apache License, Version 2.0 (the "License");
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%% you may not use this file except in compliance with the License.
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%% You may obtain a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing, software
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%% distributed under the License is distributed on an "AS IS" BASIS,
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% See the License for the specific language governing permissions and
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%% limitations under the License.
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-module(emqx_mock_client).
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-behaviour(gen_server).
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-export([start_link/1, open_session/3, open_session/4,
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close_session/1, stop/1, get_last_message/1]).
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-record(state, {clean_start, client_id, client_pid, last_msg, session_pid}).
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start_link(ClientId) ->
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gen_server:start_link(?MODULE, [ClientId], []).
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open_session(ClientPid, ClientId, Zone) ->
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open_session(ClientPid, ClientId, Zone, _Attrs = #{}).
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open_session(ClientPid, ClientId, Zone, Attrs0) ->
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Attrs1 = default_session_attributes(Zone, ClientId, ClientPid),
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Attrs = maps:merge(Attrs1, Attrs0),
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gen_server:call(ClientPid, {start_session, ClientPid, ClientId, Attrs}).
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%% close session and terminate the client itself
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close_session(ClientPid) ->
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gen_server:call(ClientPid, stop_session, infinity).
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stop(CPid) ->
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gen_server:call(CPid, stop, infinity).
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get_last_message(Pid) ->
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gen_server:call(Pid, get_last_message, infinity).
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init([ClientId]) ->
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erlang:process_flag(trap_exit, true),
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{ok, #state{clean_start = true,
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client_id = ClientId,
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last_msg = undefined
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}
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}.
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handle_call({start_session, ClientPid, ClientId, Attrs}, _From, State) ->
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{ok, SessPid} = emqx_sm:open_session(Attrs),
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{reply, {ok, SessPid},
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State#state{clean_start = true,
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client_id = ClientId,
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client_pid = ClientPid,
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session_pid = SessPid
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}};
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handle_call(stop_session, _From, #state{session_pid = Pid} = State) ->
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is_pid(Pid) andalso is_process_alive(Pid) andalso emqx_sm:close_session(Pid),
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{stop, normal, ok, State#state{session_pid = undefined}};
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handle_call(get_last_message, _From, #state{last_msg = Msg} = State) ->
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{reply, Msg, State};
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handle_call(stop, _From, State) ->
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{stop, normal, ok, State};
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handle_call(_Request, _From, State) ->
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{reply, ok, State}.
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handle_cast(_Msg, State) ->
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{noreply, State}.
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handle_info({deliver, Msg}, State) ->
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{noreply, State#state{last_msg = Msg}};
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handle_info(_Info, State) ->
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{noreply, State}.
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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default_session_attributes(Zone, ClientId, ClientPid) ->
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#{zone => Zone,
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client_id => ClientId,
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conn_pid => ClientPid,
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clean_start => true,
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username => undefined,
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expiry_interval => 0,
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max_inflight => 0,
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topic_alias_maximum => 0,
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will_msg => undefined
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}.
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