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+%% This Source Code Form is subject to the terms of the Mozilla Public
+%% License, v. 2.0. If a copy of the MPL was not distributed with this
+%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
+%%
+%% Copyright (c) 2020 VMware, Inc. or its affiliates. All rights reserved.
+%%
+
+-module(rabbit_channel_tracking_handler).
+
+%% This module keeps track of channel creation and termination events
+%% on its local node. Similar to the rabbit_connection_tracking_handler,
+%% the primary goal here is to decouple channel tracking from rabbit_reader
+%% and isolate channel tracking to its own process to avoid blocking connection
+%% creation events. Additionaly, creation events are also non-blocking in that
+%% they spawn a short-live process for updating the tracking tables in realtime.
+%%
+%% Events from other nodes are ignored.
+
+-behaviour(gen_event).
+
+-export([init/1, handle_call/2, handle_event/2, handle_info/2,
+ terminate/2, code_change/3]).
+
+-include_lib("rabbit.hrl").
+
+-rabbit_boot_step({?MODULE,
+ [{description, "channel tracking event handler"},
+ {mfa, {gen_event, add_handler,
+ [rabbit_event, ?MODULE, []]}},
+ {cleanup, {gen_event, delete_handler,
+ [rabbit_event, ?MODULE, []]}},
+ {requires, [channel_tracking]},
+ {enables, recovery}]}).
+
+%%
+%% API
+%%
+
+init([]) ->
+ {ok, []}.
+
+handle_event(#event{type = channel_created, props = Details}, State) ->
+ ok = rabbit_channel_tracking:update_tracked({channel_created, Details}),
+ {ok, State};
+handle_event(#event{type = channel_closed, props = Details}, State) ->
+ ok = rabbit_channel_tracking:update_tracked({channel_closed, Details}),
+ {ok, State};
+handle_event(#event{type = connection_closed, props = Details}, State) ->
+ ok = rabbit_channel_tracking:update_tracked({connection_closed, Details}),
+ {ok, State};
+handle_event(#event{type = user_deleted, props = Details}, State) ->
+ ok = rabbit_channel_tracking:update_tracked({user_deleted, Details}),
+ {ok, State};
+%% A node had been deleted from the cluster.
+handle_event(#event{type = node_deleted, props = Details}, State) ->
+ ok = rabbit_channel_tracking:update_tracked({node_deleted, Details}),
+ {ok, State};
+handle_event(_Event, State) ->
+ {ok, State}.
+
+handle_call(_Request, State) ->
+ {ok, not_understood, State}.
+
+handle_info(_Info, State) ->
+ {ok, State}.
+
+terminate(_Arg, _State) ->
+ ok.
+
+code_change(_OldVsn, State, _Extra) ->
+ {ok, State}.