132 lines
4.2 KiB
Erlang
132 lines
4.2 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% @author anlicheng
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%%% @copyright (C) 2025, <COMPANY>
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%%% @doc
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%%%
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%%% @end
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%%% Created : 19. 4月 2025 16:33
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%%%-------------------------------------------------------------------
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-module(efka_util).
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-author("anlicheng").
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%% API
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-export([get_file_md5/1]).
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-export([timestamp/0, number_format/2, timestamp_ms/0, float_to_binary/2, int_format/2]).
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-export([chunks/2, rand_bytes/1, uuid/0, md5/1, sha_uuid/0]).
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-export([json_data/1, json_error/2]).
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-export([starts_with/2, file_md5/1]).
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get_file_md5(FilePath) when is_list(FilePath) ->
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{ok, FileData} = file:read_file(FilePath),
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Md5Binary = crypto:hash(md5, FileData),
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string:lowercase(lists:flatten([io_lib:format("~2.16.0b", [X]) || X <- binary_to_list(Md5Binary)])).
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%% 时间，精确到毫秒
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timestamp_ms() ->
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{Mega, Seconds, Micro} = os:timestamp(),
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(Mega * 1000000 + Seconds) * 1000 + Micro div 1000.
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timestamp() ->
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{Mega, Seconds, _Micro} = os:timestamp(),
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Mega * 1000000 + Seconds.
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number_format(Num, _Decimals) when is_integer(Num) ->
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Num;
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number_format(Float, Decimals) when is_float(Float) ->
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list_to_float(float_to_list(Float, [{decimals, Decimals}, compact])).
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int_format(Num, Len) when is_integer(Num), Len > 0 ->
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S = integer_to_list(Num),
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case length(S) > Len of
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true ->
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list_to_integer(lists:sublist(S, 1, Len));
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false ->
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Num
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end.
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%% 将数据分组
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-spec chunks(list(), integer()) -> [list()].
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chunks(List, Size) when is_list(List), is_integer(Size), Size > 0, length(List) =< Size ->
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[List];
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chunks(List, Size) when is_list(List), is_integer(Size), Size > 0 ->
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chunks0(List, Size, Size, [], []).
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chunks0([], _, _, [], AccTarget) ->
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lists:reverse(AccTarget);
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chunks0([], _, _, Target, AccTarget) ->
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lists:reverse([lists:reverse(Target) | AccTarget]);
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chunks0(List, Size, 0, Target, AccTarget) ->
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chunks0(List, Size, Size, [], [lists:reverse(Target) | AccTarget]);
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chunks0([Hd | Tail], Size, Num, Target, AccTarget) ->
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chunks0(Tail, Size, Num - 1, [Hd | Target], AccTarget).
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json_data(Data) ->
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jiffy:encode(#{
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<<"result">> => Data
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}, [force_utf8]).
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json_error(ErrCode, ErrMessage) when is_integer(ErrCode), is_binary(ErrMessage) ->
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jiffy:encode(#{
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<<"error">> => #{
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<<"code">> => ErrCode,
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<<"message">> => ErrMessage
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}
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}, [force_utf8]).
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uuid() ->
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rand_bytes(16).
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-spec rand_bytes(Size :: integer()) -> string().
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rand_bytes(Size) when is_integer(Size), Size > 0 ->
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Size1 = erlang:ceil(Size / 2),
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Bytes = crypto:strong_rand_bytes(Size1),
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S = lists:flatten([integer_to_list(E, 16) || <<E:4>> <= Bytes]),
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lists:sublist(string:to_lower(S), 1, Size).
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-spec md5(Str :: binary()) -> binary().
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md5(Str) when is_binary(Str) ->
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list_to_binary(lists:flatten([hex(X) || <<X:4>> <= erlang:md5(Str)])).
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hex(N) when N < 10 ->
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$0 + N;
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hex(N) ->
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$a + (N - 10).
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-spec float_to_binary(Num :: number(), integer()) -> binary().
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float_to_binary(V, _) when is_integer(V) ->
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integer_to_binary(V);
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float_to_binary(V, Decimals) when is_float(V), is_integer(Decimals) ->
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S = float_to_list(V, [{decimals, Decimals}, compact]),
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list_to_binary(S).
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%% 生产唯一的uuid
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-spec sha_uuid() -> binary().
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sha_uuid() ->
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Salt = crypto:strong_rand_bytes(32),
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Str = string:lowercase(binary:encode_hex(crypto:hash(sha256, Salt))),
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binary:part(Str, 1, 32).
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-spec starts_with(Binary :: binary(), Prefix :: binary()) -> boolean().
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starts_with(Binary, Prefix) when is_binary(Binary), is_binary(Prefix) ->
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PrefixSize = byte_size(Prefix),
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case Binary of
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<<Prefix:PrefixSize/binary, _Rest/binary>> -> true;
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_ -> false
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end.
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-spec file_md5(FilePath :: string()) -> Md5 :: string().
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file_md5(FilePath) when is_list(FilePath) ->
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{ok, F} = file:open(FilePath, [read, binary]),
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Digest = md5_loop(F, crypto:hash_init(md5)),
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file:close(F),
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lists:flatten(io_lib:format("~32.16.0b", [binary:decode_unsigned(Digest)])).
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md5_loop(F, Context) ->
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%% 每次读取 1MB，可调整块大小
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case file:read(F, 1024 * 1024) of
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eof ->
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crypto:hash_final(Context);
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{ok, Bin} ->
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md5_loop(F, crypto:hash_update(Context, Bin))
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end.
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