c3e6f3c3b2
* Replace case catch.. with try ... catch Prior to this change, case catch ... would cost a lot of performance because it would retrieve the whole stacktrace. However, try...catch will not retrieve the whole stacktrace. So try...catch syntax is better.
56 lines
1.9 KiB
Erlang
56 lines
1.9 KiB
Erlang
%% Copyright (c) 2013-2019 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_mountpoint).
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-include("emqx.hrl").
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-include("logger.hrl").
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-export([mount/2, unmount/2]).
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-export([replvar/2]).
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-type(mountpoint() :: binary()).
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-export_type([mountpoint/0]).
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mount(undefined, Any) ->
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Any;
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mount(MountPoint, Msg = #message{topic = Topic}) ->
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Msg#message{topic = <<MountPoint/binary, Topic/binary>>};
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mount(MountPoint, TopicFilters) when is_list(TopicFilters) ->
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[{<<MountPoint/binary, Topic/binary>>, SubOpts} || {Topic, SubOpts} <- TopicFilters].
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unmount(undefined, Msg) ->
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Msg;
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unmount(MountPoint, Msg = #message{topic = Topic}) ->
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try split_binary(Topic, byte_size(MountPoint)) of
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{MountPoint, Topic1} -> Msg#message{topic = Topic1}
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catch
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_Error:Reason ->
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?LOG(error, "Unmount error : ~p", [Reason]),
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Msg
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end.
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replvar(undefined, _Vars) ->
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undefined;
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replvar(MountPoint, #{client_id := ClientId, username := Username}) ->
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lists:foldl(fun feed_var/2, MountPoint, [{<<"%c">>, ClientId}, {<<"%u">>, Username}]).
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feed_var({<<"%c">>, ClientId}, MountPoint) ->
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emqx_topic:feed_var(<<"%c">>, ClientId, MountPoint);
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feed_var({<<"%u">>, undefined}, MountPoint) ->
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MountPoint;
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feed_var({<<"%u">>, Username}, MountPoint) ->
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emqx_topic:feed_var(<<"%u">>, Username, MountPoint).
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