session
This commit is contained in:
Feng
parent
04c2772859
commit
ddf831f361
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@ -20,15 +20,30 @@
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%%% SOFTWARE.
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%%%-----------------------------------------------------------------------------
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%%% @doc
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%%% Simple message queue.
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%%%
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%%% A Simple in-memory message queue.
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%%%
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%%% Notice that MQTT is not an enterprise messaging queue. MQTT assume that client
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%%% should be online in most of the time.
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%%%
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%%% This module wraps an erlang queue to store offline messages temporarily for MQTT
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%%% persistent session.
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%%% This module implements a simple in-memory queue for MQTT persistent session.
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%%%
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%%% If the broker restarted or crashed, all the messages stored will be gone.
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%%% If the broker restarted or crashed, all the messages queued will be gone.
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%%%
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%%% Desgin of The Queue:
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%%% |<----------------- Max Len ----------------->|
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%%% -----------------------------------------------
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%%% IN -> | Pending Messages | Inflight Window | -> Out
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%%% -----------------------------------------------
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%%% |<--- Win Size --->|
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%%%
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%%%
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%%% 1. Inflight Window to store the messages awaiting for ack.
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%%%
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%%% 2. Suspend IN messages when the queue is deactive, or inflight windows is full.
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%%%
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%%% 3. If the queue is full, dropped qos0 messages if store_qos0 is true,
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%%% otherwise dropped the oldest pending one.
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%%%
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%%% @end
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%%%-----------------------------------------------------------------------------
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@ -40,104 +55,98 @@
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-include_lib("emqtt/include/emqtt.hrl").
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-export([new/2, name/1,
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is_empty/1, len/1,
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in/2, out/1,
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peek/1,
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to_list/1]).
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-define(MAX_LEN, 600).
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-define(HIGH_WM, 0.6).
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is_empty/1, is_full/1,
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len/1, in/2, out/2]).
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-define(LOW_WM, 0.2).
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-define(HIGH_WM, 0.6).
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-define(MAX_LEN, 1000).
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-record(mqueue, {name,
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len = 0,
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q = queue:new(), %% pending queue
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len = 0, %% current queue len
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low_wm = ?LOW_WM,
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high_wm = ?HIGH_WM,
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max_len = ?MAX_LEN,
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queue = queue:new(),
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store_qos0 = false,
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high_watermark = ?HIGH_WM,
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low_watermark = ?LOW_WM,
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alert = false}).
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qos0 = false,
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alarm = false}).
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-type mqueue() :: #mqueue{}.
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-type queue_option() :: {max_queued_messages, pos_integer()} %% Max messages queued
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| {high_queue_watermark, float()} %% High watermark
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| {low_queue_watermark, float()} %% Low watermark
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| {queue_qos0_messages, boolean()}. %% Queue Qos0 messages?
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-type mqueue_option() :: {max_length, pos_integer()} %% Max queue length
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| {inflight_window, pos_integer()} %% Inflight Window
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| {low_watermark, float()} %% Low watermark
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| {high_watermark, float()} %% High watermark
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| {queue_qos0, boolean()}. %% Queue Qos0
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-export_type([mqueue/0]).
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%%------------------------------------------------------------------------------
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%% @doc New Queue.
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%% @end
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%%------------------------------------------------------------------------------
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-spec new(binary() | string(), list(queue_option())) -> mqueue().
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-spec new(binary(), list(mqueue_option())) -> mqueue().
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new(Name, Opts) ->
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MaxLen = emqttd_opts:g(max_queued_messages, Opts, ?MAX_LEN),
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HighWM = round(MaxLen * emqttd_opts:g(high_queue_watermark, Opts, ?HIGH_WM)),
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LowWM = round(MaxLen * emqttd_opts:g(low_queue_watermark, Opts, ?LOW_WM)),
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StoreQos0 = emqttd_opts:g(queue_qos0_messages, Opts, false),
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MaxLen = emqttd_opts:g(max_length, Opts, ?MAX_LEN),
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#mqueue{name = Name,
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max_len = MaxLen,
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store_qos0 = StoreQos0,
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high_watermark = HighWM,
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low_watermark = LowWM}.
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low_wm = round(MaxLen * emqttd_opts:g(low_watermark, Opts, ?LOW_WM)),
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high_wm = round(MaxLen * emqttd_opts:g(high_watermark, Opts, ?HIGH_WM)),
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qos0 = emqttd_opts:g(queue_qos0, Opts, true)}.
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name(#mqueue{name = Name}) ->
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Name.
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len(#mqueue{len = Len}) ->
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Len.
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is_empty(#mqueue{len = 0}) -> true;
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is_empty(_Q) -> false.
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is_empty(_MQ) -> false.
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is_full(#mqueue{len = Len, max_len = MaxLen})
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when Len =:= MaxLen -> true;
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is_full(_MQ) -> false.
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len(#mqueue{len = Len}) -> Len.
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%%------------------------------------------------------------------------------
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%% @doc
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%% Queue one message.
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%%
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%% @doc Queue one message.
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%% @end
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%%------------------------------------------------------------------------------
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-spec in(mqtt_message(), mqueue()) -> mqueue().
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in(#mqtt_message{qos = ?QOS_0}, MQ = #mqueue{store_qos0 = false}) ->
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%% drop qos0
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in(#mqtt_message{qos = ?QOS_0}, MQ = #mqueue{qos0 = false}) ->
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MQ;
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%% queue is full, drop the oldest
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in(Msg, MQ = #mqueue{name = Name, len = Len, max_len = MaxLen, queue = Q}) when Len =:= MaxLen ->
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Q2 = case queue:out(Q) of
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{{value, OldMsg}, Q1} ->
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%%TODO: publish the dropped message to $SYS?
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lager:error("Queue(~s) drop message: ~p", [Name, OldMsg]),
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Q1;
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{empty, Q1} -> %% maybe max_len is 1
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Q1
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end,
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MQ#mqueue{queue = queue:in(Msg, Q2)};
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in(Msg, MQ = #mqueue{len = Len, queue = Q}) ->
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maybe_set_alarm(MQ#mqueue{len = Len+1, queue = queue:in(Msg, Q)}).
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out(MQ = #mqueue{len = 0, queue = _Q}) ->
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%% simply drop the oldest one if queue is full, improve later
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in(Msg, MQ = #mqueue{name = Name, len = Len, max_len = MaxLen})
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when Len =:= MaxLen ->
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{{value, OldMsg}, Q2} = queue:out(Q),
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lager:error("queue(~s) drop message: ~p", [Name, OldMsg]),
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MQ#mqueue{q = queue:in(Msg, Q2)};
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in(Msg, MQ = #mqueue{q = Q, len = Len}) ->
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maybe_set_alarm(MQ#mqueue{q = queue:in(Msg, Q), len = Len + 1});
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out(MQ = #mqueue{len = 0}) ->
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{empty, MQ};
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out(MQ = #mqueue{len = Len, queue = Q}) ->
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{Result, Q1} = queue:out(Q),
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{Result, maybe_clear_alarm(MQ#mqueue{len = Len - 1, queue = Q1})}.
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peek(#mqueue{queue = Q}) ->
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queue:peek(Q).
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out(MQ = #mqueue{q = Q, len = Len}) ->
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{Result, Q2} = queue:out(Q),
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{Result, maybe_clear_alarm(MQ#mqueue{q = Q2, len = Len - 1})}.
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to_list(#mqueue{queue = Q}) ->
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queue:to_list(Q).
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maybe_set_alarm(MQ = #mqueue{name = Name, len = Len, high_watermark = HighWM, alert = false})
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maybe_set_alarm(MQ = #mqueue{name = Name, len = Len, high_wm = HighWM, alarm = false})
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when Len >= HighWM ->
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AlarmDescr = io_lib:format("len ~p > high_watermark ~p", [Len, HighWM]),
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emqttd_alarm:set_alarm({{queue_high_watermark, Name}, AlarmDescr}),
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MQ#mqueue{alert = true};
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MQ#mqueue{alarm = true};
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maybe_set_alarm(MQ) ->
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MQ.
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maybe_clear_alarm(MQ = #mqueue{name = Name, len = Len, low_watermark = LowWM, alert = true})
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maybe_clear_alarm(MQ = #mqueue{name = Name, len = Len, low_watermark = LowWM, alarm = true})
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when Len =< LowWM ->
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emqttd_alarm:clear_alarm({queue_high_watermark, Name}), MQ#mqueue{alert = false};
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emqttd_alarm:clear_alarm({queue_high_watermark, Name}),
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MQ#mqueue{alarm = false};
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maybe_clear_alarm(MQ) ->
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MQ.
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@ -0,0 +1,66 @@
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%%%-----------------------------------------------------------------------------
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%%% Copyright (c) 2012-2015 eMQTT.IO, All Rights Reserved.
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%%%
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%%% Permission is hereby granted, free of charge, to any person obtaining a copy
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%%% of this software and associated documentation files (the "Software"), to deal
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%%% in the Software without restriction, including without limitation the rights
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%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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%%% copies of the Software, and to permit persons to whom the Software is
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%%% furnished to do so, subject to the following conditions:
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%%%
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%%% The above copyright notice and this permission notice shall be included in all
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%%% copies or substantial portions of the Software.
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%%%
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%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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%%% SOFTWARE.
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%%%-----------------------------------------------------------------------------
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%%% @doc
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%%% Inflight window of message queue. Wrap a list with len.
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%%%
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%%% @end
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%%%-----------------------------------------------------------------------------
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-module(emqttd_mqwin).
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-author("Feng Lee <feng@emqtt.io>").
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-export([new/2, len/1, in/2, ack/2]).
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-define(WIN_SIZE, 100).
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-record(mqwin, {name,
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w = [], %% window list
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len = 0, %% current window len
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size = ?WIN_SIZE}).
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-type mqwin() :: #mqwin{}.
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-export_type([mqwin/0]).
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new(Name, Opts) ->
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WinSize = emqttd_opts:g(inflight_window, Opts, ?WIN_SIZE),
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#mqwin{name = Name, size = WinSize}.
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len(#mqwin{len = Len}) ->
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Len.
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in(_Msg, #mqwin{len = Len, size = Size})
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when Len =:= Size -> {error, full};
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in(Msg, Win = #mqwin{w = W, len = Len}) ->
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{ok, Win#mqwin{w = [Msg|W], len = Len +1}}.
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ack(MsgId, QWin = #mqwin{w = W, len = Len}) ->
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case lists:keyfind(MsgId, 2, W) of
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false ->
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lager:error("qwin(~s) cannot find msgid: ~p", [MsgId]), QWin;
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_Msg ->
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QWin#mqwin{w = lists:keydelete(MsgId, 2, W), len = Len - 1}
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end.
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@ -35,24 +35,20 @@
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-include_lib("emqtt/include/emqtt_packet.hrl").
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%% API Function Exports
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-define(SessProc, emqttd_session_proc).
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%% Session Managenent APIs
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-export([start/1,
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resume/3,
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publish/3,
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destroy/2]).
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%% PubSub APIs
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-export([publish/3,
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puback/2,
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subscribe/2,
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unsubscribe/2,
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destroy/2]).
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%% This api looks strange... :(
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-export([store/2]).
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%% Start gen_server
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-export([start_link/2]).
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%% gen_server Function Exports
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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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await/2,
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dispatch/2]).
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-record(session, {
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%% ClientId: Identifier of Session
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@ -67,20 +63,11 @@
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%% Client’s subscriptions.
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subscriptions :: list(),
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%% Inflight window size
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inflight_window = 40,
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%% Inflight qos1, qos2 messages sent to the client but unacked,
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%% QoS 1 and QoS 2 messages which have been sent to the Client,
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%% but have not been completely acknowledged.
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%% Client <- Broker
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inflight_queue :: list(),
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%% Inflight qos2 messages received from client and waiting for pubrel.
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%% QoS 2 messages which have been received from the Client,
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%% but have not been completely acknowledged.
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%% Client -> Broker
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awaiting_queue :: list(),
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inflight_window :: emqttd_mqwin:mqwin(),
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%% All qos1, qos2 messages published to when client is disconnected.
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%% QoS 1 and QoS 2 messages pending transmission to the Client.
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@ -88,18 +75,22 @@
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%% Optionally, QoS 0 messages pending transmission to the Client.
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pending_queue :: emqttd_mqueue:mqueue(),
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%% Inflight qos2 messages received from client and waiting for pubrel.
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%% QoS 2 messages which have been received from the Client,
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%% but have not been completely acknowledged.
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%% Client -> Broker
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awaiting_rel :: map(),
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%% Awaiting timers for ack, rel and comp.
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awaiting_ack :: map(),
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awaiting_rel :: map(),
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awaiting_comp :: map(),
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%% Retries to resend the unacked messages
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max_unack_retries = 3,
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unack_retries = 3,
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%% 4, 8, 16 seconds if 3 retries:)
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unack_retry_after = 4,
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unack_timeout = 4,
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%% Awaiting PUBREL timeout
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await_rel_timeout = 8,
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@ -109,9 +100,9 @@
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sess_expired_timer,
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timestamp }).
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timestamp}).
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-type session() :: #session{} | pid().
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-type session() :: #session{}.
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%%%=============================================================================
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%%% Session API
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@ -139,6 +130,7 @@ start({false = _CleanSess, ClientId, ClientPid}) ->
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resume(SessState = #session{}, _ClientId, _ClientPid) ->
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SessState;
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resume(SessPid, ClientId, ClientPid) when is_pid(SessPid) ->
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?SessProc:
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gen_server:cast(SessPid, {resume, ClientId, ClientPid}),
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SessPid.
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@ -342,171 +334,6 @@ initial_state(ClientId, ClientPid) ->
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State = initial_state(ClientId),
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State#session{client_pid = ClientPid}.
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%%------------------------------------------------------------------------------
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%% @doc Start a session process.
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%% @end
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%%------------------------------------------------------------------------------
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start_link(ClientId, ClientPid) ->
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gen_server:start_link(?MODULE, [ClientId, ClientPid], []).
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%%%=============================================================================
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%%% gen_server callbacks
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%%%=============================================================================
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init([ClientId, ClientPid]) ->
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process_flag(trap_exit, true),
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true = link(ClientPid),
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State = initial_state(ClientId, ClientPid),
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MQueue = emqttd_mqueue:new(ClientId, emqttd:env(mqtt, queue)),
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State1 = State#session{pending_queue = MQueue,
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timestamp = os:timestamp()},
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{ok, init(emqttd:env(mqtt, session), State1), hibernate}.
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init([], State) ->
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State;
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%% Session expired after hours
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init([{expired_after, Hours} | Opts], State) ->
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init(Opts, State#session{sess_expired_after = Hours * 3600});
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%% Max number of QoS 1 and 2 messages that can be “inflight” at one time.
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init([{max_inflight_messages, MaxInflight} | Opts], State) ->
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init(Opts, State#session{inflight_window = MaxInflight});
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%% Max retries for unacknolege Qos1/2 messages
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init([{max_unack_retries, Retries} | Opts], State) ->
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init(Opts, State#session{max_unack_retries = Retries});
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%% Retry after 4, 8, 16 seconds
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init([{unack_retry_after, Secs} | Opts], State) ->
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init(Opts, State#session{unack_retry_after = Secs});
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%% Awaiting PUBREL timeout
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init([{await_rel_timeout, Secs} | Opts], State) ->
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init(Opts, State#session{await_rel_timeout = Secs});
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init([Opt | Opts], State) ->
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lager:error("Bad Session Option: ~p", [Opt]),
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init(Opts, State).
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handle_call({subscribe, Topics}, _From, State) ->
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{ok, NewState, GrantedQos} = subscribe(State, Topics),
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{reply, {ok, GrantedQos}, NewState};
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handle_call({unsubscribe, Topics}, _From, State) ->
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{ok, NewState} = unsubscribe(State, Topics),
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{reply, ok, NewState};
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handle_call(Req, _From, State) ->
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lager:error("Unexpected request: ~p", [Req]),
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{reply, error, State}.
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handle_cast({resume, ClientId, ClientPid}, State = #session{
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clientid = ClientId,
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client_pid = OldClientPid,
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msg_queue = Queue,
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awaiting_ack = AwaitingAck,
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awaiting_comp = AwaitingComp,
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expire_timer = ETimer}) ->
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lager:info([{client, ClientId}], "Session ~s resumed by ~p",[ClientId, ClientPid]),
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%% kick old client...
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if
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OldClientPid =:= undefined ->
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ok;
|
||||
OldClientPid =:= ClientPid ->
|
||||
ok;
|
||||
true ->
|
||||
lager:error("Session '~s' is duplicated: pid=~p, oldpid=~p", [ClientId, ClientPid, OldClientPid]),
|
||||
unlink(OldClientPid),
|
||||
OldClientPid ! {stop, duplicate_id, ClientPid}
|
||||
end,
|
||||
|
||||
%% cancel timeout timer
|
||||
emqttd_util:cancel_timer(ETimer),
|
||||
|
||||
%% redelivery PUBREL
|
||||
lists:foreach(fun(PacketId) ->
|
||||
ClientPid ! {redeliver, {?PUBREL, PacketId}}
|
||||
end, maps:keys(AwaitingComp)),
|
||||
|
||||
%% redelivery messages that awaiting PUBACK or PUBREC
|
||||
Dup = fun(Msg) -> Msg#mqtt_message{dup = true} end,
|
||||
lists:foreach(fun(Msg) ->
|
||||
ClientPid ! {dispatch, {self(), Dup(Msg)}}
|
||||
end, maps:values(AwaitingAck)),
|
||||
|
||||
%% send offline messages
|
||||
lists:foreach(fun(Msg) ->
|
||||
ClientPid ! {dispatch, {self(), Msg}}
|
||||
end, emqttd_queue:all(Queue)),
|
||||
|
||||
{noreply, State#session{client_pid = ClientPid,
|
||||
msg_queue = emqttd_queue:clear(Queue),
|
||||
expire_timer = undefined}, hibernate};
|
||||
|
||||
handle_cast({publish, ClientId, {?QOS_2, Message}}, State) ->
|
||||
NewState = publish(State, ClientId, {?QOS_2, Message}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({puback, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBACK, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({pubrec, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBREC, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({pubrel, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBREL, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({pubcomp, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBCOMP, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({destroy, ClientId}, State = #session{clientid = ClientId}) ->
|
||||
lager:warning("Session ~s destroyed", [ClientId]),
|
||||
{stop, normal, State};
|
||||
|
||||
handle_cast(Msg, State) ->
|
||||
lager:critical("Unexpected Msg: ~p, State: ~p", [Msg, State]),
|
||||
{noreply, State}.
|
||||
|
||||
handle_info({dispatch, {_From, Messages}}, State) when is_list(Messages) ->
|
||||
F = fun(Message, S) -> dispatch(Message, S) end,
|
||||
{noreply, lists:foldl(F, State, Messages)};
|
||||
|
||||
handle_info({dispatch, {_From, Message}}, State) ->
|
||||
{noreply, dispatch(Message, State)};
|
||||
|
||||
handle_info({'EXIT', ClientPid, Reason}, State = #session{clientid = ClientId,
|
||||
client_pid = ClientPid}) ->
|
||||
lager:info("Session: client ~s@~p exited for ~p", [ClientId, ClientPid, Reason]),
|
||||
{noreply, start_expire_timer(State#session{client_pid = undefined})};
|
||||
|
||||
handle_info({'EXIT', ClientPid0, _Reason}, State = #session{client_pid = ClientPid}) ->
|
||||
lager:error("Unexpected Client EXIT: pid=~p, pid(state): ~p", [ClientPid0, ClientPid]),
|
||||
{noreply, State};
|
||||
|
||||
handle_info(session_expired, State = #session{clientid = ClientId}) ->
|
||||
lager:warning("Session ~s expired!", [ClientId]),
|
||||
{stop, {shutdown, expired}, State};
|
||||
|
||||
handle_info({timeout, awaiting_rel, MsgId}, SessState) ->
|
||||
NewState = timeout(awaiting_rel, MsgId, SessState),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_info(Info, State) ->
|
||||
lager:critical("Unexpected Info: ~p, State: ~p", [Info, State]),
|
||||
{noreply, State}.
|
||||
|
||||
terminate(_Reason, _State) ->
|
||||
ok.
|
||||
|
||||
code_change(_OldVsn, State, _Extra) ->
|
||||
{ok, State}.
|
||||
|
||||
%%%=============================================================================
|
||||
%%% Internal functions
|
||||
|
|
|
|||
|
|
@ -27,3 +27,186 @@
|
|||
|
||||
-module(emqttd_session_proc).
|
||||
|
||||
-author("Feng Lee <feng@emqtt.io>").
|
||||
|
||||
-include("emqttd.hrl").
|
||||
|
||||
-include_lib("emqtt/include/emqtt.hrl").
|
||||
|
||||
-include_lib("emqtt/include/emqtt_packet.hrl").
|
||||
|
||||
%% Start gen_server
|
||||
-export([start_link/2]).
|
||||
|
||||
%% gen_server Function Exports
|
||||
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
|
||||
terminate/2, code_change/3]).
|
||||
|
||||
%%------------------------------------------------------------------------------
|
||||
%% @doc Start a session process.
|
||||
%% @end
|
||||
%%------------------------------------------------------------------------------
|
||||
start_link(ClientId, ClientPid) ->
|
||||
gen_server:start_link(?MODULE, [ClientId, ClientPid], []).
|
||||
|
||||
%%%=============================================================================
|
||||
%%% gen_server callbacks
|
||||
%%%=============================================================================
|
||||
|
||||
init([ClientId, ClientPid]) ->
|
||||
process_flag(trap_exit, true),
|
||||
true = link(ClientPid),
|
||||
State = initial_state(ClientId, ClientPid),
|
||||
MQueue = emqttd_mqueue:new(ClientId, emqttd:env(mqtt, queue)),
|
||||
State1 = State#session{pending_queue = MQueue,
|
||||
timestamp = os:timestamp()},
|
||||
{ok, init(emqttd:env(mqtt, session), State1), hibernate}.
|
||||
|
||||
init([], State) ->
|
||||
State;
|
||||
|
||||
%% Session expired after hours
|
||||
init([{expired_after, Hours} | Opts], State) ->
|
||||
init(Opts, State#session{sess_expired_after = Hours * 3600});
|
||||
|
||||
%% Max number of QoS 1 and 2 messages that can be “inflight” at one time.
|
||||
init([{max_inflight_messages, MaxInflight} | Opts], State) ->
|
||||
init(Opts, State#session{inflight_window = MaxInflight});
|
||||
|
||||
%% Max retries for unacknolege Qos1/2 messages
|
||||
init([{max_unack_retries, Retries} | Opts], State) ->
|
||||
init(Opts, State#session{max_unack_retries = Retries});
|
||||
|
||||
%% Retry after 4, 8, 16 seconds
|
||||
init([{unack_retry_after, Secs} | Opts], State) ->
|
||||
init(Opts, State#session{unack_retry_after = Secs});
|
||||
|
||||
%% Awaiting PUBREL timeout
|
||||
init([{await_rel_timeout, Secs} | Opts], State) ->
|
||||
init(Opts, State#session{await_rel_timeout = Secs});
|
||||
|
||||
init([Opt | Opts], State) ->
|
||||
lager:error("Bad Session Option: ~p", [Opt]),
|
||||
init(Opts, State).
|
||||
|
||||
handle_call({subscribe, Topics}, _From, State) ->
|
||||
{ok, NewState, GrantedQos} = subscribe(State, Topics),
|
||||
{reply, {ok, GrantedQos}, NewState};
|
||||
|
||||
handle_call({unsubscribe, Topics}, _From, State) ->
|
||||
{ok, NewState} = unsubscribe(State, Topics),
|
||||
{reply, ok, NewState};
|
||||
|
||||
handle_call(Req, _From, State) ->
|
||||
lager:error("Unexpected request: ~p", [Req]),
|
||||
{reply, error, State}.
|
||||
|
||||
handle_cast({resume, ClientId, ClientPid}, State = #session{
|
||||
clientid = ClientId,
|
||||
client_pid = OldClientPid,
|
||||
msg_queue = Queue,
|
||||
awaiting_ack = AwaitingAck,
|
||||
awaiting_comp = AwaitingComp,
|
||||
expire_timer = ETimer}) ->
|
||||
|
||||
lager:info([{client, ClientId}], "Session ~s resumed by ~p",[ClientId, ClientPid]),
|
||||
|
||||
%% kick old client...
|
||||
if
|
||||
OldClientPid =:= undefined ->
|
||||
ok;
|
||||
OldClientPid =:= ClientPid ->
|
||||
ok;
|
||||
true ->
|
||||
lager:error("Session '~s' is duplicated: pid=~p, oldpid=~p", [ClientId, ClientPid, OldClientPid]),
|
||||
unlink(OldClientPid),
|
||||
OldClientPid ! {stop, duplicate_id, ClientPid}
|
||||
end,
|
||||
|
||||
%% cancel timeout timer
|
||||
emqttd_util:cancel_timer(ETimer),
|
||||
|
||||
%% redelivery PUBREL
|
||||
lists:foreach(fun(PacketId) ->
|
||||
ClientPid ! {redeliver, {?PUBREL, PacketId}}
|
||||
end, maps:keys(AwaitingComp)),
|
||||
|
||||
%% redelivery messages that awaiting PUBACK or PUBREC
|
||||
Dup = fun(Msg) -> Msg#mqtt_message{dup = true} end,
|
||||
lists:foreach(fun(Msg) ->
|
||||
ClientPid ! {dispatch, {self(), Dup(Msg)}}
|
||||
end, maps:values(AwaitingAck)),
|
||||
|
||||
%% send offline messages
|
||||
lists:foreach(fun(Msg) ->
|
||||
ClientPid ! {dispatch, {self(), Msg}}
|
||||
end, emqttd_queue:all(Queue)),
|
||||
|
||||
{noreply, State#session{client_pid = ClientPid,
|
||||
msg_queue = emqttd_queue:clear(Queue),
|
||||
expire_timer = undefined}, hibernate};
|
||||
|
||||
|
||||
handle_cast({publish, ClientId, {?QOS_2, Message}}, State) ->
|
||||
NewState = publish(State, ClientId, {?QOS_2, Message}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({puback, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBACK, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({pubrec, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBREC, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({pubrel, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBREL, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({pubcomp, PacketId}, State) ->
|
||||
NewState = puback(State, {?PUBCOMP, PacketId}),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_cast({destroy, ClientId}, State = #session{clientid = ClientId}) ->
|
||||
lager:warning("Session ~s destroyed", [ClientId]),
|
||||
{stop, normal, State};
|
||||
|
||||
handle_cast(Msg, State) ->
|
||||
lager:critical("Unexpected Msg: ~p, State: ~p", [Msg, State]),
|
||||
{noreply, State}.
|
||||
|
||||
handle_info({dispatch, {_From, Messages}}, State) when is_list(Messages) ->
|
||||
F = fun(Message, S) -> dispatch(Message, S) end,
|
||||
{noreply, lists:foldl(F, State, Messages)};
|
||||
|
||||
handle_info({dispatch, {_From, Message}}, State) ->
|
||||
{noreply, dispatch(Message, State)};
|
||||
|
||||
handle_info({'EXIT', ClientPid, Reason}, State = #session{clientid = ClientId,
|
||||
client_pid = ClientPid}) ->
|
||||
lager:info("Session: client ~s@~p exited for ~p", [ClientId, ClientPid, Reason]),
|
||||
{noreply, start_expire_timer(State#session{client_pid = undefined})};
|
||||
|
||||
handle_info({'EXIT', ClientPid0, _Reason}, State = #session{client_pid = ClientPid}) ->
|
||||
lager:error("Unexpected Client EXIT: pid=~p, pid(state): ~p", [ClientPid0, ClientPid]),
|
||||
{noreply, State};
|
||||
|
||||
handle_info(session_expired, State = #session{clientid = ClientId}) ->
|
||||
lager:warning("Session ~s expired!", [ClientId]),
|
||||
{stop, {shutdown, expired}, State};
|
||||
|
||||
handle_info({timeout, awaiting_rel, MsgId}, SessState) ->
|
||||
NewState = timeout(awaiting_rel, MsgId, SessState),
|
||||
{noreply, NewState};
|
||||
|
||||
handle_info(Info, State) ->
|
||||
lager:critical("Unexpected Info: ~p, State: ~p", [Info, State]),
|
||||
{noreply, State}.
|
||||
|
||||
terminate(_Reason, _State) ->
|
||||
ok.
|
||||
|
||||
code_change(_OldVsn, State, _Extra) ->
|
||||
{ok, State}.
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -89,8 +89,6 @@
|
|||
{session, [
|
||||
%% Expired after 2 days
|
||||
{expired_after, 48},
|
||||
%% Max number of QoS 1 and 2 messages that can be “in flight” at one time.
|
||||
{max_inflight_messages, 40},
|
||||
%% Max retries for unacknolege Qos1/2 messages
|
||||
{max_unack_retries, 3},
|
||||
%% Retry after 4, 8, 16 seconds
|
||||
|
|
@ -99,14 +97,20 @@
|
|||
{await_rel_timeout, 8}
|
||||
]},
|
||||
{queue, [
|
||||
%% Max messages queued when client is disconnected, or inflight messsage window is overload
|
||||
{max_queued_messages, 200},
|
||||
%% High watermark of queued messsages
|
||||
{high_queue_watermark, 0.8},
|
||||
%% Max queue length
|
||||
{max_length, 1000},
|
||||
|
||||
%% Max number of QoS 1 and 2 messages that can be “in flight” at one time.
|
||||
{inflight_window, 100},
|
||||
|
||||
%% Low watermark of queued messsages
|
||||
{low_queue_watermark, 0.2},
|
||||
%% Queue Qos0 offline messages?
|
||||
{queue_qos0_messages, true}
|
||||
{low_watermark, 0.2},
|
||||
|
||||
%% High watermark of queued messsages
|
||||
{high_watermark, 0.6},
|
||||
|
||||
%% Queue Qos0 messages?
|
||||
{queue_qos0, true}
|
||||
]}
|
||||
]},
|
||||
%% Broker Options
|
||||
|
|
|
|||
Loading…
Reference in New Issue