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* src/mod_echo.erl: Example function that demonstrates how to receive XMPP packets using Erlang's message passing mechanism (EJAB-247).

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SVN Revision: 980
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Badlop 2007-11-26 10:15:18 +00:00
parent 87f7630fa3
commit 9a03e5087e
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@ -1,5 +1,7 @@
2007-11-26 Badlop <badlop@process-one.net>
* src/mod_echo.erl: Example function that demonstrates how to receive XMPP packets using Erlang's message passing mechanism (EJAB-247).
* src/ejabberdctl.template: Removed bashisms (EJAB-399). Set environment variables instead of passing parameters when calling erl (EJAB-421). Write erl_crash.dump in the log/ directory, with unique filename (EJAB-433).
* src/ejabberd_ctl.erl: Improvements in the help messages (EJAB-399).

48
src/mod_echo.erl
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@ -102,6 +102,7 @@ handle_info({route, From, To, Packet}, State) ->
"" -> jlib:make_error_reply(Packet, ?ERR_BAD_REQUEST);
_ -> Packet
end,
do_client_version(To, From),
ejabberd_router:route(To, From, Packet2),
{noreply, State};
handle_info(_Info, State) ->
@ -128,3 +129,50 @@ code_change(_OldVsn, State, _Extra) ->
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
%% ejabberd provides a method to receive XMPP packets using Erlang's
%% message passing mechanism.
%%
%% The packets received by ejabberd are sent
%% to the local destination process by sending an Erlang message.
%% This means that you can receive XMPP stanzas in an Erlang process
%% using Erlang's Receive, as long as this process is registered in
%% ejabberd as the process which handles the destination JID.
%%
%% This example function is called when a client queries the echo service.
%% This function then sends a query to the client, and waits 5 seconds to
%% receive an answer. The answer will only be accepted if it was sent
%% using exactly the same JID. We add a (mostly) random resource to
%% try to guarantee that the received response matches the request sent.
%% Finally, the received response is printed in the ejabberd log file.
do_client_version(From, To) ->
ToS = jlib:jid_to_string(To),
%% It is important to identify this process and packet
Random_resource = integer_to_list(random:uniform(100000)),
From2 = From#jid{resource = Random_resource,
lresource = Random_resource},
%% Build an iq:query request
Packet = {xmlelement, "iq",
[{"to", ToS}, {"type", "get"}],
[{xmlelement, "query", [{"xmlns", ?NS_VERSION}], []}]},
%% Send the request
ejabberd_router:route(From2, To, Packet),
%% Wait to receive the response
%% It is very important to only accept a packet which is the
%% response to the request that he sent
Els = receive {route, To, From2, IQ} ->
{xmlelement, "query", _, List} = xml:get_subtag(IQ, "query"),
List
after 5000 -> % Timeout in miliseconds: 5 seconds
[]
end,
Values = [{Name, Value} || {xmlelement,Name,[],[{xmlcdata,Value}]} <- Els],
%% Print in log
Values_string1 = [io_lib:format("~n~s: ~p", [N, V]) || {N, V} <- Values],
Values_string2 = lists:concat(Values_string1),
?INFO_MSG("Information of the client: ~s~s", [ToS, Values_string2]).