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https://github.com/processone/ejabberd.git
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cc19cb1785
* src/xml_stream.erl: Added API for managing xml streams without creating process * src/ejabberd_receiver.erl: Use this API, now 2 processes are created per C2S connection SVN Revision: 288
126 lines
3.2 KiB
Erlang
126 lines
3.2 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : xml_stream.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose : Parse XML streams
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%%% Created : 17 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(xml_stream).
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-author('alexey@sevcom.net').
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-vsn('$Revision$ ').
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-export([start/1, start/2,
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init/1, init/2,
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send_text/2,
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new/1,
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parse/2,
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close/1]).
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-define(XML_START, 0).
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-define(XML_END, 1).
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-define(XML_CDATA, 2).
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-define(XML_ERROR, 3).
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-define(PARSE_COMMAND, 0).
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-record(xml_stream_state, {callback_pid, port, stack}).
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start(CallbackPid) ->
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spawn(?MODULE, init, [CallbackPid]).
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start(Receiver, CallbackPid) ->
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spawn(?MODULE, init, [Receiver, CallbackPid]).
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init(CallbackPid) ->
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Port = open_port({spawn, expat_erl}, [binary]),
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loop(CallbackPid, Port, []).
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init(Receiver, CallbackPid) ->
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erlang:monitor(process, Receiver),
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Port = open_port({spawn, expat_erl}, [binary]),
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loop(CallbackPid, Port, []).
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loop(CallbackPid, Port, Stack) ->
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receive
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{Port, {data, Bin}} ->
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Data = binary_to_term(Bin),
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loop(CallbackPid, Port, process_data(CallbackPid, Stack, Data));
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{_From, {send, Str}} ->
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Res = port_control(Port, ?PARSE_COMMAND, Str),
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NewStack = lists:foldl(
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fun(Data, St) ->
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process_data(CallbackPid, St, Data)
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end, Stack, binary_to_term(Res)),
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loop(CallbackPid, Port, NewStack);
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{'DOWN', _Ref, _Type, _Object, _Info} ->
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ok
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end.
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process_data(CallbackPid, Stack, Data) ->
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case Data of
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{?XML_START, {Name, Attrs}} ->
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if
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Stack == [] ->
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gen_fsm:send_event(CallbackPid,
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{xmlstreamstart, Name, Attrs});
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true ->
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ok
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end,
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[{xmlelement, Name, Attrs, []} | Stack];
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{?XML_END, EndName} ->
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case Stack of
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[{xmlelement, Name, Attrs, Els} | Tail] ->
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NewEl = {xmlelement, Name, Attrs, lists:reverse(Els)},
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case Tail of
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[] ->
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gen_fsm:send_event(CallbackPid,
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{xmlstreamend, EndName}),
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Tail;
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[_] ->
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gen_fsm:send_event(CallbackPid,
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{xmlstreamelement, NewEl}),
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Tail;
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[{xmlelement, Name1, Attrs1, Els1} | Tail1] ->
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[{xmlelement, Name1, Attrs1, [NewEl | Els1]} |
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Tail1]
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end
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end;
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{?XML_CDATA, CData} ->
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case Stack of
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[El] ->
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[El];
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[{xmlelement, Name, Attrs, Els} | Tail] ->
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[{xmlelement, Name, Attrs, [{xmlcdata, CData} | Els]} |
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Tail];
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[] -> []
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end;
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{?XML_ERROR, Err} ->
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gen_fsm:send_event(CallbackPid, {xmlstreamerror, Err})
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end.
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send_text(Pid, Text) ->
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Pid ! {self(), {send, Text}}.
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new(CallbackPid) ->
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Port = open_port({spawn, expat_erl}, [binary]),
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#xml_stream_state{callback_pid = CallbackPid,
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port = Port,
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stack = []}.
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parse(#xml_stream_state{callback_pid = CallbackPid,
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port = Port,
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stack = Stack} = State, Str) ->
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Res = port_control(Port, ?PARSE_COMMAND, Str),
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NewStack = lists:foldl(
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fun(Data, St) ->
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process_data(CallbackPid, St, Data)
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end, Stack, binary_to_term(Res)),
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State#xml_stream_state{stack = NewStack}.
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close(#xml_stream_state{port = Port}) ->
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port_close(Port).
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