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ubidots_emqx_reactor_redis_cli.erl
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%%--------------------------------------------------------------------
%% Copyright (c) 2020 EMQ Technologies Co., Ltd. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%--------------------------------------------------------------------
-module(ubidots_emqx_reactor_redis_cli).
-behaviour(ecpool_worker).
-include_lib("eunit/include/eunit.hrl").
-export([connect/1, get_variables_from_topic/3]).
%%--------------------------------------------------------------------
%% Redis Connect/Query
%%--------------------------------------------------------------------
connect(_Env) ->
Env = ubidots_emqx_retainer_settings:get_settings(),
Host = maps:get(reactor_cache_host_name, Env, "127.0.0.1"),
Port = maps:get(reactor_cache_port, Env, 6379),
Database = maps:get(reactor_cache_database, Env, 2),
Password = maps:get(reactor_cache_password, Env, ""),
case eredis:start_link(Host, Port, Database, Password, 3000, 5000) of
{ok, Pid} ->
{ok, Pid};
{error, Reason = {connection_error, _}} ->
io:format("[Redis] Can't connect to Redis server: Connection refused."),
{error, Reason};
{error, Reason = {authentication_error, _}} ->
io:format("[Redis] Can't connect to Redis server: Authentication failed."),
{error, Reason};
{error, Reason} ->
io:format("[Redis] Can't connect to Redis server: ~p", [Reason]),
{error, Reason}
end.
get_topic_type(match, match) ->
both;
get_topic_type(match, nomatch) ->
value;
get_topic_type(nomatch, match) ->
last_value;
get_topic_type(nomatch, nomatch) ->
none.
get_mqtt_topic_kind(Topic) ->
LastValuePattern =
"^/(v1.6|v2.0)/users/[^/]+/devices/((([a-zA-Z0-9_:.-]+|[+])/((([a-zA-Z0-9_:.-]+|[+])/(lv"
"|#|[+]))|#)|#)|#)$",
ValuePattern =
"^/(v1.6|v2.0)/users/[^/]+/devices/((([a-zA-Z0-9_:.-]+|[+])/((([a-zA-Z0-9_:.-]+|[+]))|#)"
"|#)|#)$",
IsLastValueTopic = re:run(Topic, LastValuePattern, [{capture, all_names}]),
IsValueTopic = re:run(Topic, ValuePattern, [{capture, all_names}]),
get_topic_type(IsValueTopic, IsLastValueTopic).
get_variable_label([]) ->
"*";
get_variable_label(["+" | _Rest]) ->
"*";
get_variable_label(["#" | _Rest]) ->
"*";
get_variable_label([VariableLabel | _Rest]) ->
VariableLabel.
get_device_label("+") ->
"*";
get_device_label("#") ->
"*";
get_device_label(DeviceLabel) ->
DeviceLabel.
decode_mqtt_topic(Topic) ->
[_, Version, _, Token, _, DeviceLabelPart | Rest] =
re:split(Topic, "/", [{return, list}]),
VariableLabel = get_variable_label(Rest),
DeviceLabel = get_device_label(DeviceLabelPart),
[Version, Token, DeviceLabel, VariableLabel].
execute_redis_command(Pool, Type, Args) ->
case Type of
cluster ->
{ok, Result} = eredis_cluster:q(Pool, Args),
Result;
single ->
{ok, Result} =
ecpool:with_client(Pool, fun(RedisClient) -> eredis:q(RedisClient, Args) end),
Result
end.
binary_to_list_validated(undefined) ->
[];
binary_to_list_validated(Value) ->
binary_to_list(Value).
can_view_value_device(_Pool, _Type, _PermissionType, _OwnerId, "*", _Token) ->
"1";
can_view_value_device(_Pool, _Type, "all", _OwnerId, _DeviceLabel, _Token) ->
"1";
can_view_value_device(Pool, Type, _PermissionType, OwnerId, DeviceLabel, Token) ->
DeviceHashSetKey = "reactor_variables/" ++ OwnerId,
DeviceLabelKey = "/" ++ DeviceLabel,
TokenKey = "reactor_devices_with_permissions/view_value/" ++ Token,
DeviceId = execute_redis_command(Pool, Type, ["HGET", DeviceHashSetKey, DeviceLabelKey]),
CanViewValueDevice = execute_redis_command(Pool, Type, ["SISMEMBER", TokenKey, DeviceId]),
binary_to_list_validated(CanViewValueDevice).
get_topics_mqtt_by_topic(none, _Topic, _VariableId) ->
[];
get_topics_mqtt_by_topic(last_value, Topic, VariableId) ->
[atom_to_list(last_value), Topic ++ "/lv", VariableId];
get_topics_mqtt_by_topic(value, Topic, VariableId) ->
[atom_to_list(value), Topic, VariableId];
get_topics_mqtt_by_topic(both, Topic, VariableId) ->
get_topics_mqtt_by_topic(last_value, Topic, VariableId)
++ get_topics_mqtt_by_topic(value, Topic, VariableId).
get_topics_mqtt(DeviceLabel, VariableLabel, VariableId, TopicKind, Version) ->
Topic = "/" ++ Version ++ "/devices/" ++ DeviceLabel ++ "/" ++ VariableLabel,
get_topics_mqtt_by_topic(TopicKind, Topic, VariableId).
get_mqtt_topics_variable_label(_DeviceLabel, _VariableId, [], _TopicKind, _Version) ->
[];
get_mqtt_topics_variable_label(DeviceLabel,
VariableId,
[VariableLabel],
TopicKind,
Version) ->
get_topics_mqtt(DeviceLabel, VariableLabel, VariableId, TopicKind, Version).
get_mqtt_topics_variable_key(VariableKey, VariableId, DeviceLabels, TopicKind, Version) ->
[_, DeviceLabel | Rest] = re:split(VariableKey, "/", [{return, list}]),
case lists:member(DeviceLabel, DeviceLabels) of
true ->
get_mqtt_topics_variable_label(DeviceLabel, VariableId, Rest, TopicKind, Version);
false ->
[]
end.
get_mqtt_topics_by_hash_set([], _DeviceLabels, _TopicKind, _Version) ->
[];
get_mqtt_topics_by_hash_set([VariableKey, VariableId | Rest],
DeviceLabels,
TopicKind,
Version) ->
get_mqtt_topics_variable_key(VariableKey, VariableId, DeviceLabels, TopicKind, Version)
++ get_mqtt_topics_by_hash_set(Rest, DeviceLabels, TopicKind, Version).
get_mqtt_topics_by_device_labels(Pool, Type, DeviceLabels, OwnerId, TopicKind, Version) ->
ReactorVariablesKey = "reactor_variables/" ++ OwnerId,
VariablesData = execute_redis_command(Pool, Type, ["HGETALL", ReactorVariablesKey]),
get_mqtt_topics_by_hash_set(VariablesData, DeviceLabels, TopicKind, Version).
get_device_labels_by_device_ids(_Pool, _Type, []) ->
[];
get_device_labels_by_device_ids(Pool, Type, [DeviceId | Rest]) ->
DeviceHashSetKey = "reactor_device_data/" ++ binary_to_list_validated(DeviceId),
DeviceLabel =
execute_redis_command(Pool, Type, ["HGET", DeviceHashSetKey, "/device_label"]),
[binary_to_list_validated(DeviceLabel)]
++ get_device_labels_by_device_ids(Pool, Type, Rest).
get_device_labels(Pool, Type, Token) ->
DeviceIdsKey = "reactor_devices_with_permissions/view_value/" ++ Token,
DeviceIds = execute_redis_command(Pool, Type, ["SMEMBERS", DeviceIdsKey]),
get_device_labels_by_device_ids(Pool, Type, DeviceIds).
get_mqtt_topics_device_labels_and_variable_label(_Pool,
_Type,
_CanViewDevice,
[],
_VariableLabel,
_OwnerId,
_Token,
_TopicKind,
_Version) ->
[];
get_mqtt_topics_device_labels_and_variable_label(Pool,
Type,
CanViewDevice,
[DeviceLabel | Rest],
VariableLabel,
OwnerId,
Token,
TopicKind,
Version) ->
get_mqtt_topics_by_label(Pool,
Type,
CanViewDevice,
DeviceLabel,
VariableLabel,
OwnerId,
Token,
TopicKind,
Version)
++ get_mqtt_topics_device_labels_and_variable_label(Pool,
Type,
CanViewDevice,
Rest,
VariableLabel,
OwnerId,
Token,
TopicKind,
Version).
get_mqtt_topics_by_label(Pool, Type, "1", "*", "*", OwnerId, Token, TopicKind, Version) ->
DeviceLabels = get_device_labels(Pool, Type, Token),
get_mqtt_topics_by_device_labels(Pool, Type, DeviceLabels, OwnerId, TopicKind, Version);
get_mqtt_topics_by_label(Pool,
Type,
"1",
DeviceLabel,
"*",
OwnerId,
_,
TopicKind,
Version) ->
get_mqtt_topics_by_device_labels(Pool, Type, [DeviceLabel], OwnerId, TopicKind, Version);
get_mqtt_topics_by_label(Pool,
Type,
"1",
"*",
VariableLabel,
OwnerId,
Token,
TopicKind,
Version) ->
DeviceLabels = get_device_labels(Pool, Type, Token),
get_mqtt_topics_device_labels_and_variable_label(Pool,
Type,
"1",
DeviceLabels,
VariableLabel,
OwnerId,
Token,
TopicKind,
Version);
get_mqtt_topics_by_label(Pool,
Type,
"1",
DeviceLabel,
VariableLabel,
OwnerId,
_,
TopicKind,
Version) ->
VariableIdHashSetKey = "reactor_variables/" ++ OwnerId,
VariableIdKey = "/" ++ DeviceLabel ++ "/" ++ VariableLabel,
VariableId =
execute_redis_command(Pool, Type, ["HGET", VariableIdHashSetKey, VariableIdKey]),
get_topics_mqtt(DeviceLabel, VariableLabel, VariableId, TopicKind, Version);
get_mqtt_topics_by_label(_Pool,
_Type,
_CanViewDevice,
_DeviceLabel,
_VariableLabel,
_OwnerId,
_Token,
_TopicKind,
_Version) ->
[].
get_variables_topic(Pool, Type, Topic) ->
TopicKind = get_mqtt_topic_kind(Topic),
[Version, Token, DeviceLabel, VariableLabel] = decode_mqtt_topic(Topic),
TokenHashSetKey = "reactor_tokens/" ++ Token,
OwnerId = execute_redis_command(Pool, Type, ["HGET", TokenHashSetKey, "/owner_id"]),
PermissionsType =
execute_redis_command(Pool, Type, ["HGET", TokenHashSetKey, "/permissions_type"]),
CanViewDevice =
can_view_value_device(Pool,
Type,
binary_to_list_validated(PermissionsType),
binary_to_list_validated(OwnerId),
DeviceLabel,
Token),
get_mqtt_topics_by_label(Pool,
Type,
CanViewDevice,
DeviceLabel,
VariableLabel,
binary_to_list_validated(OwnerId),
Token,
TopicKind,
Version).
get_variables_from_topic(Pool, Type, Topic) ->
Result = {ok, get_variables_topic(Pool, Type, Topic)},
Result.
get_mqtt_topics_test() ->
["last_value", "/v1.6/devices/d1/v1/lv", "variable_id"] =
get_topics_mqtt_by_topic(last_value, "/v1.6/devices/d1/v1", "variable_id"),
["value", "/v1.6/devices/d1/v1", "variable_id"] =
get_topics_mqtt_by_topic(value, "/v1.6/devices/d1/v1", "variable_id"),
["last_value",
"/v1.6/devices/d1/v1/lv",
"variable_id",
"value",
"/v1.6/devices/d1/v1",
"variable_id"] =
get_topics_mqtt_by_topic(both, "/v1.6/devices/d1/v1", "variable_id").
decode_mqtt_topic_test() ->
["v1.6", "token", "d1", "v1"] = decode_mqtt_topic("/v1.6/users/token/devices/d1/v1/lv"),
["v1.6", "token", "d1", "v1"] = decode_mqtt_topic("/v1.6/users/token/devices/d1/v1"),
["v1.6", "token", "d1", "*"] = decode_mqtt_topic("/v1.6/users/token/devices/d1/+/lv"),
["v1.6", "token", "d1", "*"] = decode_mqtt_topic("/v1.6/users/token/devices/d1/+"),
["v1.6", "token", "d1", "*"] = decode_mqtt_topic("/v1.6/users/token/devices/d1/#"),
["v1.6", "token", "*", "v1"] = decode_mqtt_topic("/v1.6/users/token/devices/+/v1"),
["v1.6", "token", "*", "v1"] = decode_mqtt_topic("/v1.6/users/token/devices/+/v1/lv"),
["v1.6", "token", "*", "*"] = decode_mqtt_topic("/v1.6/users/token/devices/#"),
["v1.6", "token", "*", "*"] = decode_mqtt_topic("/v1.6/users/token/devices/+/+"),
["v1.6", "token", "*", "*"] = decode_mqtt_topic("/v1.6/users/token/devices/+/#").
get_mqtt_topic_invalid_test() ->
none = get_mqtt_topic_kind("invalid_topic"),
none = get_mqtt_topic_kind("/v1.x/users/token/devices/d1/v1/lv"),
none = get_mqtt_topic_kind("/v1.6/user/token/devices/d1/v1/lv").
get_mqtt_topic_v1_kind_test() ->
last_value = get_mqtt_topic_kind("/v1.6/users/token/devices/d1/v1/lv"),
value = get_mqtt_topic_kind("/v1.6/users/token/devices/d1/v1"),
last_value = get_mqtt_topic_kind("/v1.6/users/token/devices/d1/+/lv"),
value = get_mqtt_topic_kind("/v1.6/users/token/devices/d1/+"),
both = get_mqtt_topic_kind("/v1.6/users/token/devices/d1/#"),
value = get_mqtt_topic_kind("/v1.6/users/token/devices/+/v1"),
last_value = get_mqtt_topic_kind("/v1.6/users/token/devices/+/v1/lv"),
both = get_mqtt_topic_kind("/v1.6/users/token/devices/#"),
value = get_mqtt_topic_kind("/v1.6/users/token/devices/+/+"),
both = get_mqtt_topic_kind("/v1.6/users/token/devices/+/#").
get_mqtt_topic_v2_kind_test() ->
last_value = get_mqtt_topic_kind("/v2.0/users/token/devices/d1/v1/lv"),
value = get_mqtt_topic_kind("/v2.0/users/token/devices/d1/v1"),
last_value = get_mqtt_topic_kind("/v2.0/users/token/devices/d1/+/lv"),
value = get_mqtt_topic_kind("/v2.0/users/token/devices/d1/+"),
both = get_mqtt_topic_kind("/v2.0/users/token/devices/d1/#"),
value = get_mqtt_topic_kind("/v2.0/users/token/devices/+/v1"),
last_value = get_mqtt_topic_kind("/v2.0/users/token/devices/+/v1/lv"),
both = get_mqtt_topic_kind("/v2.0/users/token/devices/#"),
value = get_mqtt_topic_kind("/v2.0/users/token/devices/+/+"),
both = get_mqtt_topic_kind("/v2.0/users/token/devices/+/#").