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emqx_rule_funcs.erl
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emqx_rule_funcs.erl
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%%--------------------------------------------------------------------
%% Copyright (c) 2020-2024 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(emqx_rule_funcs).
-include("rule_engine.hrl").
-include_lib("emqx/include/logger.hrl").
-elvis([{elvis_style, god_modules, disable}]).
%% IoT Funcs
-export([
msgid/0,
qos/0,
flags/0,
flag/1,
topic/0,
topic/1,
clientid/0,
clientip/0,
peerhost/0,
username/0,
payload/0,
payload/1,
contains_topic/2,
contains_topic/3,
contains_topic_match/2,
contains_topic_match/3,
null/0
]).
%% Arithmetic Funcs
-export([
'+'/2,
'-'/2,
'*'/2,
'/'/2,
'div'/2,
mod/2,
eq/2
]).
%% Math Funcs
-export([
abs/1,
acos/1,
acosh/1,
asin/1,
asinh/1,
atan/1,
atanh/1,
ceil/1,
cos/1,
cosh/1,
exp/1,
floor/1,
fmod/2,
log/1,
log10/1,
log2/1,
power/2,
round/1,
sin/1,
sinh/1,
sqrt/1,
tan/1,
tanh/1
]).
%% Bitwise operations
-export([
bitnot/1,
bitand/2,
bitor/2,
bitxor/2,
bitsl/2,
bitsr/2
]).
%% binary and bitstring Funcs
-export([
bitsize/1,
bytesize/1,
subbits/2,
subbits/3,
subbits/4,
subbits/5,
subbits/6
]).
%% Data Type Conversion
-export([
str/1,
str_utf8/1,
bool/1,
int/1,
float/1,
float/2,
float2str/2,
map/1,
bin2hexstr/1,
hexstr2bin/1
]).
%% Data Type Validation Funcs
-export([
is_null/1,
is_null_var/1,
is_not_null/1,
is_not_null_var/1,
is_str/1,
is_bool/1,
is_int/1,
is_float/1,
is_num/1,
is_map/1,
is_array/1
]).
%% String Funcs
-export([
lower/1,
ltrim/1,
reverse/1,
rtrim/1,
strlen/1,
substr/2,
substr/3,
trim/1,
upper/1,
split/2,
split/3,
concat/2,
tokens/2,
tokens/3,
sprintf_s/2,
pad/2,
pad/3,
pad/4,
replace/3,
replace/4,
regex_match/2,
regex_replace/3,
ascii/1,
find/2,
find/3,
join_to_string/1,
join_to_string/2,
join_to_sql_values_string/1,
jq/2,
jq/3
]).
%% Map Funcs
-export([map_new/0]).
-export([
map_get/2,
map_get/3,
map_put/3,
map_keys/1,
map_values/1,
map_to_entries/1
]).
%% For backward compatibility
-export([
mget/2,
mget/3,
mput/3
]).
%% Array Funcs
-export([
nth/2,
length/1,
sublist/2,
sublist/3,
first/1,
last/1,
contains/2
]).
%% Hash Funcs
-export([
md5/1,
sha/1,
sha256/1
]).
%% zip Funcs
-export([
zip/1,
unzip/1
]).
%% gzip Funcs
-export([
gzip/1,
gunzip/1
]).
%% compressed Funcs
-export([
zip_compress/1,
zip_uncompress/1
]).
%% Data encode and decode
-export([
base64_encode/1,
base64_decode/1,
json_decode/1,
json_encode/1,
term_decode/1,
term_encode/1
]).
%% Date functions
-export([
now_rfc3339/0,
now_rfc3339/1,
unix_ts_to_rfc3339/1,
unix_ts_to_rfc3339/2,
rfc3339_to_unix_ts/1,
rfc3339_to_unix_ts/2,
now_timestamp/0,
now_timestamp/1,
format_date/3,
format_date/4,
date_to_unix_ts/3,
date_to_unix_ts/4,
timezone_to_second/1,
timezone_to_offset_seconds/1
]).
%% See extra_functions_module/0 and set_extra_functions_module/1 in the
%% emqx_rule_engine module
-callback handle_rule_function(atom(), list()) -> any() | {error, no_match_for_function}.
%% MongoDB specific date functions. These functions return a date tuple. The
%% MongoDB bridge converts such date tuples to a MongoDB date type. The
%% following functions are therefore only useful for rules with at least one
%% MongoDB action.
-export([
mongo_date/0,
mongo_date/1,
mongo_date/2
]).
%% Random Funcs
-export([
random/0,
uuid_v4/0,
uuid_v4_no_hyphen/0
]).
%% Proc Dict Func
-export([
proc_dict_get/1,
proc_dict_put/2,
proc_dict_del/1,
kv_store_get/1,
kv_store_get/2,
kv_store_put/2,
kv_store_del/1
]).
-export(['$handle_undefined_function'/2]).
-compile(
{no_auto_import, [
abs/1,
ceil/1,
floor/1,
round/1,
map_get/2
]}
).
-import(emqx_utils_calendar, [time_unit/1, now_to_rfc3339/0, now_to_rfc3339/1, epoch_to_rfc3339/2]).
%% @doc "msgid()" Func
msgid() ->
fun
(#{id := MsgId}) -> MsgId;
(_) -> undefined
end.
%% @doc "qos()" Func
qos() ->
fun
(#{qos := QoS}) -> QoS;
(_) -> undefined
end.
%% @doc "topic()" Func
topic() ->
fun
(#{topic := Topic}) -> Topic;
(_) -> undefined
end.
%% @doc "topic(N)" Func
topic(I) when is_integer(I) ->
fun
(#{topic := Topic}) ->
lists:nth(I, emqx_topic:tokens(Topic));
(_) ->
undefined
end.
%% @doc "flags()" Func
flags() ->
fun
(#{flags := Flags}) -> Flags;
(_) -> #{}
end.
%% @doc "flags(Name)" Func
flag(Name) ->
fun
(#{flags := Flags}) -> emqx_rule_maps:nested_get({var, Name}, Flags);
(_) -> undefined
end.
%% @doc "clientid()" Func
clientid() ->
fun
(#{from := ClientId}) -> ClientId;
(_) -> undefined
end.
%% @doc "username()" Func
username() ->
fun
(#{username := Username}) -> Username;
(_) -> undefined
end.
%% @doc "clientip()" Func
clientip() ->
peerhost().
peerhost() ->
fun
(#{peerhost := Addr}) -> Addr;
(_) -> undefined
end.
payload() ->
fun
(#{payload := Payload}) -> Payload;
(_) -> undefined
end.
payload(Path) ->
fun
(#{payload := Payload}) when erlang:is_map(Payload) ->
emqx_rule_maps:nested_get(map_path(Path), Payload);
(_) ->
undefined
end.
%% @doc Check if a topic_filter contains a specific topic
%% TopicFilters = [{<<"t/a">>, #{qos => 0}].
-spec contains_topic(emqx_types:topic_filters(), emqx_types:topic()) ->
true | false.
contains_topic(TopicFilters, Topic) ->
case find_topic_filter(Topic, TopicFilters, fun eq/2) of
not_found -> false;
_ -> true
end.
contains_topic(TopicFilters, Topic, QoS) ->
case find_topic_filter(Topic, TopicFilters, fun eq/2) of
{_, #{qos := QoS}} -> true;
_ -> false
end.
-spec contains_topic_match(emqx_types:topic_filters(), emqx_types:topic()) ->
true | false.
contains_topic_match(TopicFilters, Topic) ->
case find_topic_filter(Topic, TopicFilters, fun emqx_topic:match/2) of
not_found -> false;
_ -> true
end.
contains_topic_match(TopicFilters, Topic, QoS) ->
case find_topic_filter(Topic, TopicFilters, fun emqx_topic:match/2) of
{_, #{qos := QoS}} -> true;
_ -> false
end.
find_topic_filter(Filter, TopicFilters, Func) ->
try
[
case Func(Topic, Filter) of
true -> throw(Result);
false -> ok
end
|| Result = #{topic := Topic} <- TopicFilters
],
not_found
catch
throw:Result -> Result
end.
null() ->
undefined.
bytesize(IoList) ->
erlang:iolist_size(IoList).
%%------------------------------------------------------------------------------
%% Arithmetic Funcs
%%------------------------------------------------------------------------------
%% plus 2 numbers
'+'(X, Y) when is_number(X), is_number(Y) ->
X + Y;
%% string concatenation
%% this requires one of the arguments is string, the other argument will be converted
%% to string automatically (implicit conversion)
'+'(X, Y) when is_binary(X); is_binary(Y) ->
concat(X, Y).
'-'(X, Y) when is_number(X), is_number(Y) ->
X - Y.
'*'(X, Y) when is_number(X), is_number(Y) ->
X * Y.
'/'(X, Y) when is_number(X), is_number(Y) ->
X / Y.
'div'(X, Y) when is_integer(X), is_integer(Y) ->
X div Y.
mod(X, Y) when is_integer(X), is_integer(Y) ->
X rem Y.
eq(X, Y) ->
X == Y.
%%------------------------------------------------------------------------------
%% Math Funcs
%%------------------------------------------------------------------------------
abs(N) when is_integer(N) ->
erlang:abs(N).
acos(N) when is_number(N) ->
math:acos(N).
acosh(N) when is_number(N) ->
math:acosh(N).
asin(N) when is_number(N) ->
math:asin(N).
asinh(N) when is_number(N) ->
math:asinh(N).
atan(N) when is_number(N) ->
math:atan(N).
atanh(N) when is_number(N) ->
math:atanh(N).
ceil(N) when is_number(N) ->
erlang:ceil(N).
cos(N) when is_number(N) ->
math:cos(N).
cosh(N) when is_number(N) ->
math:cosh(N).
exp(N) when is_number(N) ->
math:exp(N).
floor(N) when is_number(N) ->
erlang:floor(N).
fmod(X, Y) when is_number(X), is_number(Y) ->
math:fmod(X, Y).
log(N) when is_number(N) ->
math:log(N).
log10(N) when is_number(N) ->
math:log10(N).
log2(N) when is_number(N) ->
math:log2(N).
power(X, Y) when is_number(X), is_number(Y) ->
math:pow(X, Y).
round(N) when is_number(N) ->
erlang:round(N).
sin(N) when is_number(N) ->
math:sin(N).
sinh(N) when is_number(N) ->
math:sinh(N).
sqrt(N) when is_number(N) ->
math:sqrt(N).
tan(N) when is_number(N) ->
math:tan(N).
tanh(N) when is_number(N) ->
math:tanh(N).
%%------------------------------------------------------------------------------
%% Bits Funcs
%%------------------------------------------------------------------------------
bitnot(I) when is_integer(I) ->
bnot I.
bitand(X, Y) when is_integer(X), is_integer(Y) ->
X band Y.
bitor(X, Y) when is_integer(X), is_integer(Y) ->
X bor Y.
bitxor(X, Y) when is_integer(X), is_integer(Y) ->
X bxor Y.
bitsl(X, I) when is_integer(X), is_integer(I) ->
X bsl I.
bitsr(X, I) when is_integer(X), is_integer(I) ->
X bsr I.
bitsize(Bits) when is_bitstring(Bits) ->
bit_size(Bits).
subbits(Bits, Len) when is_integer(Len), is_bitstring(Bits) ->
subbits(Bits, 1, Len).
subbits(Bits, Start, Len) when is_integer(Start), is_integer(Len), is_bitstring(Bits) ->
get_subbits(Bits, Start, Len, <<"integer">>, <<"unsigned">>, <<"big">>).
subbits(Bits, Start, Len, Type) when
is_integer(Start), is_integer(Len), is_bitstring(Bits)
->
get_subbits(Bits, Start, Len, Type, <<"unsigned">>, <<"big">>).
subbits(Bits, Start, Len, Type, Signedness) when
is_integer(Start), is_integer(Len), is_bitstring(Bits)
->
get_subbits(Bits, Start, Len, Type, Signedness, <<"big">>).
subbits(Bits, Start, Len, Type, Signedness, Endianness) when
is_integer(Start), is_integer(Len), is_bitstring(Bits)
->
get_subbits(Bits, Start, Len, Type, Signedness, Endianness).
get_subbits(Bits, Start, Len, Type, Signedness, Endianness) ->
Begin = Start - 1,
case Bits of
<<_:Begin, Rem/bits>> when Rem =/= <<>> ->
Sz = bit_size(Rem),
do_get_subbits(Rem, Sz, Len, Type, Signedness, Endianness);
_ ->
undefined
end.
-define(match_bits(Bits0, Pattern, ElesePattern),
case Bits0 of
Pattern ->
SubBits;
ElesePattern ->
SubBits
end
).
do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"unsigned">>, <<"big">>) ->
?match_bits(
Bits,
<<SubBits:Len/integer-unsigned-big-unit:1, _/bits>>,
<<SubBits:Sz/integer-unsigned-big-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"float">>, <<"unsigned">>, <<"big">>) ->
?match_bits(
Bits,
<<SubBits:Len/float-unsigned-big-unit:1, _/bits>>,
<<SubBits:Sz/float-unsigned-big-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"unsigned">>, <<"big">>) ->
?match_bits(
Bits,
<<SubBits:Len/bits-unsigned-big-unit:1, _/bits>>,
<<SubBits:Sz/bits-unsigned-big-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"signed">>, <<"big">>) ->
?match_bits(
Bits,
<<SubBits:Len/integer-signed-big-unit:1, _/bits>>,
<<SubBits:Sz/integer-signed-big-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"float">>, <<"signed">>, <<"big">>) ->
?match_bits(
Bits,
<<SubBits:Len/float-signed-big-unit:1, _/bits>>,
<<SubBits:Sz/float-signed-big-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"signed">>, <<"big">>) ->
?match_bits(
Bits,
<<SubBits:Len/bits-signed-big-unit:1, _/bits>>,
<<SubBits:Sz/bits-signed-big-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"unsigned">>, <<"little">>) ->
?match_bits(
Bits,
<<SubBits:Len/integer-unsigned-little-unit:1, _/bits>>,
<<SubBits:Sz/integer-unsigned-little-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"float">>, <<"unsigned">>, <<"little">>) ->
?match_bits(
Bits,
<<SubBits:Len/float-unsigned-little-unit:1, _/bits>>,
<<SubBits:Sz/float-unsigned-little-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"unsigned">>, <<"little">>) ->
?match_bits(
Bits,
<<SubBits:Len/bits-unsigned-little-unit:1, _/bits>>,
<<SubBits:Sz/bits-unsigned-little-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"integer">>, <<"signed">>, <<"little">>) ->
?match_bits(
Bits,
<<SubBits:Len/integer-signed-little-unit:1, _/bits>>,
<<SubBits:Sz/integer-signed-little-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"float">>, <<"signed">>, <<"little">>) ->
?match_bits(
Bits,
<<SubBits:Len/float-signed-little-unit:1, _/bits>>,
<<SubBits:Sz/float-signed-little-unit:1>>
);
do_get_subbits(Bits, Sz, Len, <<"bits">>, <<"signed">>, <<"little">>) ->
?match_bits(
Bits,
<<SubBits:Len/bits-signed-little-unit:1, _/bits>>,
<<SubBits:Sz/bits-signed-little-unit:1>>
).
%%------------------------------------------------------------------------------
%% Data Type Conversion Funcs
%%------------------------------------------------------------------------------
str(Data) ->
emqx_utils_conv:bin(Data).
str_utf8(Data) when is_binary(Data); is_list(Data) ->
unicode:characters_to_binary(Data);
str_utf8(Data) ->
unicode:characters_to_binary(str(Data)).
bool(Data) ->
emqx_utils_conv:bool(Data).
int(Data) ->
emqx_utils_conv:int(Data).
float(Data) ->
emqx_utils_conv:float(Data).
float(Data, Decimals) when Decimals > 0 ->
Data1 = emqx_utils_conv:float(Data),
list_to_float(float_to_list(Data1, [{decimals, Decimals}])).
float2str(Float, Precision) ->
float_to_binary(Float, [{decimals, Precision}, compact]).
map(Bin) when is_binary(Bin) ->
case emqx_utils_json:decode(Bin) of
Map = #{} ->
Map;
_ ->
error(badarg, [Bin])
end;
map(List) when is_list(List) ->
maps:from_list(List);
map(Map = #{}) ->
Map;
map(Data) ->
error(badarg, [Data]).
bin2hexstr(Bin) when is_binary(Bin) ->
emqx_utils:bin_to_hexstr(Bin, upper).
hexstr2bin(Str) when is_binary(Str) ->
emqx_utils:hexstr_to_bin(Str).
%%------------------------------------------------------------------------------
%% NULL Funcs
%%------------------------------------------------------------------------------
is_null(undefined) -> true;
is_null(_Data) -> false.
%% Similar to is_null/1, but also works for the JSON value 'null'
is_null_var(null) -> true;
is_null_var(Data) -> is_null(Data).
is_not_null(Data) ->
not is_null(Data).
is_not_null_var(Data) ->
not is_null_var(Data).
is_str(T) when is_binary(T) -> true;
is_str(_) -> false.
is_bool(T) when is_boolean(T) -> true;
is_bool(_) -> false.
is_int(T) when is_integer(T) -> true;
is_int(_) -> false.
is_float(T) when erlang:is_float(T) -> true;
is_float(_) -> false.
is_num(T) when is_number(T) -> true;
is_num(_) -> false.
is_map(T) when erlang:is_map(T) -> true;
is_map(_) -> false.
is_array(T) when is_list(T) -> true;
is_array(_) -> false.
%%------------------------------------------------------------------------------
%% String Funcs
%%------------------------------------------------------------------------------
lower(S) when is_binary(S) ->
string:lowercase(S).
ltrim(S) when is_binary(S) ->
string:trim(S, leading).
reverse(S) when is_binary(S) ->
iolist_to_binary(string:reverse(S)).
rtrim(S) when is_binary(S) ->
string:trim(S, trailing).
strlen(S) when is_binary(S) ->
string:length(S).
substr(S, Start) when is_binary(S), is_integer(Start) ->
string:slice(S, Start).
substr(S, Start, Length) when
is_binary(S),
is_integer(Start),
is_integer(Length)
->
string:slice(S, Start, Length).
trim(S) when is_binary(S) ->
string:trim(S).
upper(S) when is_binary(S) ->
string:uppercase(S).
split(S, P) when is_binary(S), is_binary(P) ->
[R || R <- string:split(S, P, all), R =/= <<>> andalso R =/= ""].
split(S, P, <<"notrim">>) ->
string:split(S, P, all);
split(S, P, <<"leading_notrim">>) ->
string:split(S, P, leading);
split(S, P, <<"leading">>) when is_binary(S), is_binary(P) ->
[R || R <- string:split(S, P, leading), R =/= <<>> andalso R =/= ""];
split(S, P, <<"trailing_notrim">>) ->
string:split(S, P, trailing);
split(S, P, <<"trailing">>) when is_binary(S), is_binary(P) ->
[R || R <- string:split(S, P, trailing), R =/= <<>> andalso R =/= ""].
tokens(S, Separators) ->
[list_to_binary(R) || R <- string:lexemes(binary_to_list(S), binary_to_list(Separators))].
tokens(S, Separators, <<"nocrlf">>) ->
[
list_to_binary(R)
|| R <- string:lexemes(binary_to_list(S), binary_to_list(Separators) ++ [$\r, $\n, [$\r, $\n]])
].
%% implicit convert args to strings, and then do concatenation
concat(S1, S2) ->
unicode:characters_to_binary([str(S1), str(S2)], unicode).
sprintf_s(Format, Args) when is_list(Args) ->
erlang:iolist_to_binary(io_lib:format(binary_to_list(Format), Args)).
pad(S, Len) when is_binary(S), is_integer(Len) ->
iolist_to_binary(string:pad(S, Len, trailing)).
pad(S, Len, <<"trailing">>) when is_binary(S), is_integer(Len) ->
iolist_to_binary(string:pad(S, Len, trailing));
pad(S, Len, <<"both">>) when is_binary(S), is_integer(Len) ->
iolist_to_binary(string:pad(S, Len, both));
pad(S, Len, <<"leading">>) when is_binary(S), is_integer(Len) ->
iolist_to_binary(string:pad(S, Len, leading)).
pad(S, Len, <<"trailing">>, Char) when is_binary(S), is_integer(Len), is_binary(Char) ->
Chars = unicode:characters_to_list(Char, utf8),
iolist_to_binary(string:pad(S, Len, trailing, Chars));
pad(S, Len, <<"both">>, Char) when is_binary(S), is_integer(Len), is_binary(Char) ->
Chars = unicode:characters_to_list(Char, utf8),
iolist_to_binary(string:pad(S, Len, both, Chars));
pad(S, Len, <<"leading">>, Char) when is_binary(S), is_integer(Len), is_binary(Char) ->
Chars = unicode:characters_to_list(Char, utf8),
iolist_to_binary(string:pad(S, Len, leading, Chars)).
replace(SrcStr, P, RepStr) when is_binary(SrcStr), is_binary(P), is_binary(RepStr) ->
iolist_to_binary(string:replace(SrcStr, P, RepStr, all)).
replace(SrcStr, P, RepStr, <<"all">>) when is_binary(SrcStr), is_binary(P), is_binary(RepStr) ->
iolist_to_binary(string:replace(SrcStr, P, RepStr, all));
replace(SrcStr, P, RepStr, <<"trailing">>) when
is_binary(SrcStr), is_binary(P), is_binary(RepStr)
->
iolist_to_binary(string:replace(SrcStr, P, RepStr, trailing));
replace(SrcStr, P, RepStr, <<"leading">>) when is_binary(SrcStr), is_binary(P), is_binary(RepStr) ->
iolist_to_binary(string:replace(SrcStr, P, RepStr, leading)).
regex_match(Str, RE) ->
case re:run(Str, RE, [global, {capture, none}]) of
match -> true;
nomatch -> false
end.
regex_replace(SrcStr, RE, RepStr) ->
re:replace(SrcStr, RE, RepStr, [global, {return, binary}]).
ascii(Char) when is_binary(Char) ->
[FirstC | _] = binary_to_list(Char),
FirstC.
find(S, P) when is_binary(S), is_binary(P) ->
find_s(S, P, leading).
find(S, P, <<"trailing">>) when is_binary(S), is_binary(P) ->
find_s(S, P, trailing);
find(S, P, <<"leading">>) when is_binary(S), is_binary(P) ->
find_s(S, P, leading).
find_s(S, P, Dir) ->
case string:find(S, P, Dir) of
nomatch -> <<"">>;
SubStr -> SubStr
end.
join_to_string(List) when is_list(List) ->
join_to_string(<<", ">>, List).
join_to_string(Sep, List) when is_list(List), is_binary(Sep) ->
iolist_to_binary(lists:join(Sep, [str(Item) || Item <- List])).
join_to_sql_values_string(List) ->
QuotedList =
[
case is_list(Item) of
true ->
emqx_placeholder:quote_sql(emqx_utils_json:encode(Item));
false ->
emqx_placeholder:quote_sql(Item)
end
|| Item <- List
],
iolist_to_binary(lists:join(<<", ">>, QuotedList)).
-spec jq(FilterProgram, JSON, TimeoutMS) -> Result when
FilterProgram :: binary(),
JSON :: binary() | term(),
TimeoutMS :: non_neg_integer(),
Result :: [term()].
jq(FilterProgram, JSONBin, TimeoutMS) when
is_binary(FilterProgram), is_binary(JSONBin)
->
case jq:process_json(FilterProgram, JSONBin, TimeoutMS) of
{ok, Result} ->
[json_decode(JSONString) || JSONString <- Result];
{error, ErrorReason} ->
erlang:throw({jq_exception, ErrorReason})
end;
jq(FilterProgram, JSONTerm, TimeoutMS) when is_binary(FilterProgram) ->
JSONBin = json_encode(JSONTerm),
jq(FilterProgram, JSONBin, TimeoutMS).
-spec jq(FilterProgram, JSON) -> Result when
FilterProgram :: binary(),
JSON :: binary() | term(),
Result :: [term()].
jq(FilterProgram, JSONBin) ->
ConfigRootKey = emqx_rule_engine_schema:namespace(),
jq(
FilterProgram,
JSONBin,
emqx_config:get([
ConfigRootKey,
jq_function_default_timeout
])
).
%%------------------------------------------------------------------------------
%% Array Funcs
%%------------------------------------------------------------------------------
nth(N, L) when is_integer(N), is_list(L) ->
lists:nth(N, L).
length(List) when is_list(List) ->
erlang:length(List).
sublist(Len, List) when is_integer(Len), is_list(List) ->
lists:sublist(List, Len).
sublist(Start, Len, List) when is_integer(Start), is_integer(Len), is_list(List) ->
lists:sublist(List, Start, Len).
first(List) when is_list(List) ->
hd(List).
last(List) when is_list(List) ->
lists:last(List).
contains(Elm, List) when is_list(List) ->
lists:member(Elm, List).
map_new() ->
#{}.
map_get(Key, Map) ->
map_get(Key, Map, undefined).
map_get(Key, Map, Default) ->
emqx_rule_maps:nested_get(map_path(Key), Map, Default).
map_put(Key, Val, Map) ->
emqx_rule_maps:nested_put(map_path(Key), Val, Map).
mget(Key, Map) ->
mget(Key, Map, undefined).
mget(Key, Map0, Default) ->
Map = map(Map0),
case maps:find(Key, Map) of
{ok, Val} ->
Val;
error when is_atom(Key) ->
%% the map may have an equivalent binary-form key
BinKey = emqx_utils_conv:bin(Key),
case maps:find(BinKey, Map) of
{ok, Val} -> Val;
error -> Default
end;
error when is_binary(Key) ->
%% the map may have an equivalent atom-form key
try
AtomKey = list_to_existing_atom(binary_to_list(Key)),
case maps:find(AtomKey, Map) of
{ok, Val} -> Val;
error -> Default
end
catch
error:badarg ->
Default
end;
error ->
Default
end.
mput(Key, Val, Map0) ->
Map = map(Map0),
case maps:find(Key, Map) of
{ok, _} ->
maps:put(Key, Val, Map);
error when is_atom(Key) ->