%% File : xml_compress_gen.erl
%% Author : Pawel Chmielowski
%% Purpose :
%% Created : 14 Sep 2018 Pawel Chmielowski
%%
%%
%% ejabberd, Copyright (C) 2002-2022 ProcessOne
%%
%% This program is free software; you can redistribute it and/or
%% modify it under the terms of the GNU General Public License as
%% published by the Free Software Foundation; either version 2 of the
%% License, or (at your option) any later version.
%%
%% This program is distributed in the hope that it will be useful,
%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%% General Public License for more details.
%%
%% You should have received a copy of the GNU General Public License along
%% with this program; if not, write to the Free Software Foundation, Inc.,
%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%
-module(xml_compress_gen).
-author("pawel@process-one.net").
-include_lib("xmpp/include/xmpp.hrl").
%% API
-export([archive_analyze/3, process_stats/1, gen_code/3]).
-record(el_stats, {count = 0, empty_count = 0, only_text_count = 0, attrs = #{}, text_stats = #{}}).
-record(attr_stats, {count = 0, vals = #{}}).
archive_analyze(Host, Table, EHost) ->
case ejabberd_sql:sql_query(Host, [<<"select username, peer, kind, xml from ", Table/binary>>]) of
{selected, _, Res} ->
lists:foldl(
fun([U, P, K, X], Stats) ->
M = case K of
<<"groupchat">> ->
U;
_ ->
<<U/binary, "@", EHost/binary>>
end,
El = fxml_stream:parse_element(X),
analyze_element({El, <<"stream">>, <<"jabber:client">>, M, P}, Stats)
end, {0, #{}}, Res);
_ ->
none
end.
encode_id(Num) when Num < 64 ->
iolist_to_binary(io_lib:format("~p:8", [Num])).
gen_code(_File, _Rules, $<) ->
{error, <<"Invalid version">>};
gen_code(File, Rules, Ver) when Ver < 64 ->
{Data, _} = lists:foldl(
fun({Ns, El, Attrs, Text}, {Acc, Id}) ->
NsC = case lists:keyfind(Ns, 1, Acc) of
false -> [];
{_, L} -> L
end,
{AttrsE, _} = lists:mapfoldl(
fun({AName, AVals}, Id2) ->
{AD, Id3} = lists:mapfoldl(
fun(AVal, Id3) ->
{{AVal, encode_id(Id3)}, Id3 + 1}
end, Id2, AVals),
{{AName, AD ++ [encode_id(Id3)]}, Id3 + 1}
end, 3, Attrs),
{TextE, Id5} = lists:mapfoldl(
fun(TextV, Id4) ->
{{TextV, encode_id(Id4)}, Id4 + 1}
end, Id + 1, Text),
{lists:keystore(Ns, 1, Acc, {Ns, NsC ++ [{El, encode_id(Id), AttrsE, TextE}]}), Id5}
end, {[], 5}, Rules),
{ok, Dev} = file:open(File, [write]),
Mod = filename:basename(File, ".erl"),
io:format(Dev, "-module(~s).~n-export([encode/3, decode/3]).~n~n", [Mod]),
RulesS = iolist_to_binary(io_lib:format("~p", [Rules])),
RulesS2 = binary:replace(RulesS, <<"\n">>, <<"\n% ">>, [global]),
io:format(Dev, "% This file was generated by xml_compress_gen~n%~n"
"% Rules used:~n%~n% ~s~n~n", [RulesS2]),
VerId = iolist_to_binary(io_lib:format("~p:8", [Ver])),
gen_encode(Dev, Data, VerId),
gen_decode(Dev, Data, VerId),
file:close(Dev),
Data.
gen_decode(Dev, Data, VerId) ->
io:format(Dev, "decode(<<$<, _/binary>> = Data, _J1, _J2) ->~n"
" fxml_stream:parse_element(Data);~n"
"decode(<<~s, Rest/binary>>, J1, J2) ->~n"
" {El, _} = decode(Rest, <<\"jabber:client\">>, J1, J2),~n"
" El.~n~n", [VerId]),
io:format(Dev, "decode_string(Data) ->~n"
" case Data of~n"
" <<0:2, L:6, Str:L/binary, Rest/binary>> ->~n"
" {Str, Rest};~n"
" <<1:2, L1:6, 0:2, L2:6, Rest/binary>> ->~n"
" L = L2*64 + L1,~n"
" <<Str:L/binary, Rest2/binary>> = Rest,~n"
" {Str, Rest2};~n"
" <<1:2, L1:6, 1:2, L2:6, L3:8, Rest/binary>> ->~n"
" L = (L3*64 + L2)*64 + L1,~n"
" <<Str:L/binary, Rest2/binary>> = Rest,~n"
" {Str, Rest2}~n"
" end.~n~n", []),
io:format(Dev, "decode_child(<<1:8, Rest/binary>>, _PNs, _J1, _J2) ->~n"
" {Text, Rest2} = decode_string(Rest),~n"
" {{xmlcdata, Text}, Rest2};~n", []),
io:format(Dev, "decode_child(<<2:8, Rest/binary>>, PNs, J1, J2) ->~n"
" {Name, Rest2} = decode_string(Rest),~n"
" {Attrs, Rest3} = decode_attrs(Rest2),~n"
" {Children, Rest4} = decode_children(Rest3, PNs, J1, J2),~n"
" {{xmlel, Name, Attrs, Children}, Rest4};~n", []),
io:format(Dev, "decode_child(<<3:8, Rest/binary>>, PNs, J1, J2) ->~n"
" {Ns, Rest2} = decode_string(Rest),~n"
" {Name, Rest3} = decode_string(Rest2),~n"
" {Attrs, Rest4} = decode_attrs(Rest3),~n"
" {Children, Rest5} = decode_children(Rest4, Ns, J1, J2),~n"
" {{xmlel, Name, add_ns(PNs, Ns, Attrs), Children}, Rest5};~n", []),
io:format(Dev, "decode_child(<<4:8, Rest/binary>>, _PNs, _J1, _J2) ->~n"
" {stop, Rest};~n", []),
io:format(Dev, "decode_child(Other, PNs, J1, J2) ->~n"
" decode(Other, PNs, J1, J2).~n~n", []),
io:format(Dev, "decode_children(Data, PNs, J1, J2) ->~n"
" prefix_map(fun(Data2) -> decode(Data2, PNs, J1, J2) end, Data).~n~n", []),
io:format(Dev, "decode_attr(<<1:8, Rest/binary>>) ->~n"
" {Name, Rest2} = decode_string(Rest),~n"
" {Val, Rest3} = decode_string(Rest2),~n"
" {{Name, Val}, Rest3};~n", []),
io:format(Dev, "decode_attr(<<2:8, Rest/binary>>) ->~n"
" {stop, Rest}.~n~n", []),
io:format(Dev, "decode_attrs(Data) ->~n"
" prefix_map(fun decode_attr/1, Data).~n~n", []),
io:format(Dev, "prefix_map(F, Data) ->~n"
" prefix_map(F, Data, []).~n~n", []),
io:format(Dev, "prefix_map(F, Data, Acc) ->~n"
" case F(Data) of~n"
" {stop, Rest} ->~n"
" {lists:reverse(Acc), Rest};~n"
" {Val, Rest} ->~n"
" prefix_map(F, Rest, [Val | Acc])~n"
" end.~n~n", []),
io:format(Dev, "add_ns(Ns, Ns, Attrs) ->~n"
" Attrs;~n"
"add_ns(_, Ns, Attrs) ->~n"
" [{<<\"xmlns\">>, Ns} | Attrs].~n~n", []),
lists:foreach(
fun({Ns, Els}) ->
lists:foreach(
fun({Name, Id, Attrs, Text}) ->
io:format(Dev, "decode(<<~s, Rest/binary>>, PNs, J1, J2) ->~n"
" Ns = ~p,~n", [Id, Ns]),
case Attrs of
[] ->
io:format(Dev, " {Attrs, Rest2} = decode_attrs(Rest),~n", []);
_ ->
io:format(Dev, " {Attrs, Rest2} = prefix_map(fun~n", []),
lists:foreach(
fun({AName, AVals}) ->
lists:foreach(
fun({j1, AId}) ->
io:format(Dev, " (<<~s, Rest3/binary>>) ->~n"
" {{~p, J1}, Rest3};~n", [AId, AName]);
({j2, AId}) ->
io:format(Dev, " (<<~s, Rest3/binary>>) ->~n"
" {{~p, J2}, Rest3};~n", [AId, AName]);
({{j1}, AId}) ->
io:format(Dev, " (<<~s, Rest3/binary>>) ->~n"
" {AVal, Rest4} = decode_string(Rest3),~n"
" {{~p, <<J1/binary, AVal/binary>>}, Rest4};~n",
[AId, AName]);
({{j2}, AId}) ->
io:format(Dev, " (<<~s, Rest3/binary>>) ->~n"
" {AVal, Rest4} = decode_string(Rest3),~n"
" {{~p, <<J2/binary, AVal/binary>>}, Rest4};~n",
[AId, AName]);
({AVal, AId}) ->
io:format(Dev, " (<<~s, Rest3/binary>>) ->~n"
" {{~p, ~p}, Rest3};~n",
[AId, AName, AVal]);
(AId) ->
io:format(Dev, " (<<~s, Rest3/binary>>) ->~n"
" {AVal, Rest4} = decode_string(Rest3),~n"
" {{~p, AVal}, Rest4};~n",
[AId, AName])
end, AVals)
end, Attrs),
io:format(Dev, " (<<2:8, Rest3/binary>>) ->~n"
" {stop, Rest3};~n"
" (Data) ->~n"
" decode_attr(Data)~n"
" end, Rest),~n", [])
end,
case Text of
[] ->
io:format(Dev, " {Children, Rest6} = decode_children(Rest2, Ns, J1, J2),~n", []);
_ ->
io:format(Dev, " {Children, Rest6} = prefix_map(fun", []),
lists:foreach(
fun({TextS, TId}) ->
io:format(Dev, " (<<~s, Rest5/binary>>) ->~n"
" {{xmlcdata, ~p}, Rest5};~n",
[TId, TextS])
end, Text),
io:format(Dev, " (Other) ->~n"
" decode_child(Other, Ns, J1, J2)~n"
" end, Rest2),~n", [])
end,
io:format(Dev, " {{xmlel, ~p, add_ns(PNs, Ns, Attrs), Children}, Rest6};~n", [Name])
end, Els)
end, Data),
io:format(Dev, "decode(Other, PNs, J1, J2) ->~n"
" decode_child(Other, PNs, J1, J2).~n~n", []).
gen_encode(Dev, Data, VerId) ->
io:format(Dev, "encode(El, J1, J2) ->~n"
" encode_child(El, <<\"jabber:client\">>,~n"
" J1, J2, byte_size(J1), byte_size(J2), <<~s>>).~n~n", [VerId]),
io:format(Dev, "encode_attr({<<\"xmlns\">>, _}, Acc) ->~n"
" Acc;~n"
"encode_attr({N, V}, Acc) ->~n"
" <<Acc/binary, 1:8, (encode_string(N))/binary,~n"
" (encode_string(V))/binary>>.~n~n", []),
io:format(Dev, "encode_attrs(Attrs, Acc) ->~n"
" lists:foldl(fun encode_attr/2, Acc, Attrs).~n~n", []),
io:format(Dev, "encode_el(PNs, Ns, Name, Attrs, Children, J1, J2, J1L, J2L, Pfx) ->~n"
" E1 = if~n"
" PNs == Ns -> encode_attrs(Attrs, <<Pfx/binary, 2:8, (encode_string(Name))/binary>>);~n"
" true -> encode_attrs(Attrs, <<Pfx/binary, 3:8, "
"(encode_string(Ns))/binary, (encode_string(Name))/binary>>)~n"
" end,~n"
" E2 = encode_children(Children, Ns, J1, J2, J1L, J2L, <<E1/binary, 2:8>>),~n"
" <<E2/binary, 4:8>>.~n~n", []),
io:format(Dev, "encode_child({xmlel, Name, Attrs, Children}, PNs, J1, J2, J1L, J2L, Pfx) ->~n"
" case lists:keyfind(<<\"xmlns\">>, 1, Attrs) of~n"
" false ->~n"
" encode(PNs, PNs, Name, Attrs, Children, J1, J2, J1L, J2L, Pfx);~n"
" {_, Ns} ->~n"
" encode(PNs, Ns, Name, Attrs, Children, J1, J2, J1L, J2L, Pfx)~n"
" end;~n"
"encode_child({xmlcdata, Data}, _PNs, _J1, _J2, _J1L, _J2L, Pfx) ->~n"
" <<Pfx/binary, 1:8, (encode_string(Data))/binary>>.~n~n", []),
io:format(Dev, "encode_children(Children, PNs, J1, J2, J1L, J2L, Pfx) ->~n"
" lists:foldl(~n"
" fun(Child, Acc) ->~n"
" encode_child(Child, PNs, J1, J2, J1L, J2L, Acc)~n"
" end, Pfx, Children).~n~n", []),
io:format(Dev, "encode_string(Data) ->~n"
" <<V1:4, V2:6, V3:6>> = <<(byte_size(Data)):16/unsigned-big-integer>>,~n"
" case {V1, V2, V3} of~n"
" {0, 0, V3} ->~n"
" <<V3:8, Data/binary>>;~n"
" {0, V2, V3} ->~n"
" <<(V3 bor 64):8, V2:8, Data/binary>>;~n"
" _ ->~n"
" <<(V3 bor 64):8, (V2 bor 64):8, V1:8, Data/binary>>~n"
" end.~n~n", []),
lists:foreach(
fun({Ns, Els}) ->
io:format(Dev, "encode(PNs, ~p = Ns, Name, Attrs, Children, J1, J2, J1L, J2L, Pfx) ->~n"
" case Name of~n", [Ns]),
lists:foreach(
fun({ElN, Id, Attrs, Text}) ->
io:format(Dev, " ~p ->~n", [ElN]),
case Attrs of
[] ->
io:format(Dev, " E = encode_attrs(Attrs, <<Pfx/binary, ~s>>),~n", [Id]);
_ ->
io:format(Dev, " E = lists:foldl(fun~n", []),
lists:foreach(
fun({AName, AVals}) ->
case AVals of
[AIdS] when is_binary(AIdS) ->
io:format(Dev, " ({~p, AVal}, Acc) ->~n"
" <<Acc/binary, ~s, (encode_string(AVal))/binary>>;~n",
[AName, AIdS]);
_ ->
io:format(Dev, " ({~p, AVal}, Acc) ->~n"
" case AVal of~n", [AName]),
lists:foreach(
fun({j1, AId}) ->
io:format(Dev, " J1 -> <<Acc/binary, ~s>>;~n",
[AId]);
({j2, AId}) ->
io:format(Dev, " J2 -> <<Acc/binary, ~s>>;~n",
[AId]);
({{j1}, AId}) ->
io:format(Dev, " <<J1:J1L/binary, Rest/binary>> -> "
"<<Acc/binary, ~s, (encode_string(Rest))/binary>>;~n",
[AId]);
({{j2}, AId}) ->
io:format(Dev, " <<J2:J2L/binary, Rest/binary>> -> "
"<<Acc/binary, ~s, (encode_string(Rest))/binary>>;~n",
[AId]);
({AVal, AId}) ->
io:format(Dev, " ~p -> <<Acc/binary, ~s>>;~n",
[AVal, AId]);
(AId) ->
io:format(Dev, " _ -> <<Acc/binary, ~s, "
"(encode_string(AVal))/binary>>~n",
[AId])
end, AVals),
io:format(Dev, " end;~n", [])
end
end, Attrs),
io:format(Dev, " (Attr, Acc) -> encode_attr(Attr, Acc)~n", []),
io:format(Dev, " end, <<Pfx/binary, ~s>>, Attrs),~n", [Id])
end,
case Text of
[] ->
io:format(Dev, " E2 = encode_children(Children, Ns, "
"J1, J2, J1L, J2L, <<E/binary, 2:8>>),~n", []);
_ ->
io:format(Dev, " E2 = lists:foldl(fun~n", []),
lists:foreach(
fun({TextV, TId}) ->
io:format(Dev, " ({xmlcdata, ~p}, Acc) -> <<Acc/binary, ~s>>;~n", [TextV, TId])
end, Text),
io:format(Dev, " (El, Acc) -> encode_child(El, Ns, J1, J2, J1L, J2L, Acc)~n", []),
io:format(Dev, " end, <<E/binary, 2:8>>, Children),~n", [])
end,
io:format(Dev, " <<E2/binary, 4:8>>;~n", [])
end, Els),
io:format(Dev, " _ -> encode_el(PNs, Ns, Name, Attrs, Children, "
"J1, J2, J1L, J2L, Pfx)~nend;~n", [])
end, Data),
io:format(Dev, "encode(PNs, Ns, Name, Attrs, Children, J1, J2, J1L, J2L, Pfx) ->~n"
" encode_el(PNs, Ns, Name, Attrs, Children, "
"J1, J2, J1L, J2L, Pfx).~n~n", []).
process_stats({_Counts, Stats}) ->
SStats = lists:sort(
fun({_, #el_stats{count = C1}}, {_, #el_stats{count = C2}}) ->
C1 >= C2
end, maps:to_list(Stats)),
lists:map(
fun({Name, #el_stats{count = C, attrs = A, text_stats = T}}) ->
[Ns, El] = binary:split(Name, <<"<">>),
Attrs = lists:filtermap(
fun({AN, #attr_stats{count = AC, vals = AV}}) ->
if
AC*5 < C ->
false;
true ->
AVC = AC div min(maps:size(AV)*2, 10),
AVA = [N || {N, C2} <- maps:to_list(AV), C2 > AVC],
{true, {AN, AVA}}
end
end, maps:to_list(A)),
Text = [TE || {TE, TC} <- maps:to_list(T), TC > C/2],
{Ns, El, Attrs, Text}
end, SStats).
analyze_elements(Elements, Stats, PName, PNS, J1, J2) ->
lists:foldl(fun analyze_element/2, Stats, lists:map(fun(V) -> {V, PName, PNS, J1, J2} end, Elements)).
maps_update(Key, F, InitVal, Map) ->
case maps:is_key(Key, Map) of
true ->
maps:update_with(Key, F, Map);
_ ->
maps:put(Key, F(InitVal), Map)
end.
analyze_element({{xmlcdata, Data}, PName, PNS, _J1, _J2}, {ElCount, Stats}) ->
Stats2 = maps_update(<<PNS/binary, "<", PName/binary>>,
fun(#el_stats{text_stats = TS} = E) ->
TS2 = maps_update(Data, fun(C) -> C + 1 end, 0, TS),
E#el_stats{text_stats = TS2}
end, #el_stats{}, Stats),
{ElCount, Stats2};
analyze_element({#xmlel{name = Name, attrs = Attrs, children = Children}, _PName, PNS, J1, J2}, {ElCount, Stats}) ->
XMLNS = case lists:keyfind(<<"xmlns">>, 1, Attrs) of
{_, NS} ->
NS;
false ->
PNS
end,
NStats = maps_update(<<XMLNS/binary, "<", Name/binary>>,
fun(#el_stats{count = C, empty_count = EC, only_text_count = TC, attrs = A} = ES) ->
A2 = lists:foldl(
fun({<<"xmlns">>, _}, AMap) ->
AMap;
({AName, AVal}, AMap) ->
J1S = size(J1),
J2S = size(J2),
AVal2 = case AVal of
J1 ->
j1;
J2 ->
j2;
<<J1:J1S/binary, _Rest/binary>> ->
{j1};
<<J2:J2S/binary, _Rest/binary>> ->
{j2};
Other ->
Other
end,
maps_update(AName, fun(#attr_stats{count = AC, vals = AV}) ->
AV2 = maps_update(AVal2, fun(C2) -> C2 + 1 end, 0, AV),
#attr_stats{count = AC + 1, vals = AV2}
end, #attr_stats{}, AMap)
end, A, Attrs),
ES#el_stats{count = C + 1,
empty_count = if Children == [] -> EC + 1; true ->
EC end,
only_text_count = case Children of [{xmlcdata, _}] -> TC + 1; _ -> TC end,
attrs = A2}
end, #el_stats{}, Stats),
analyze_elements(Children, {ElCount + 1, NStats}, Name, XMLNS, J1, J2).
