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%%%-------------------------------------------------------------------
%%% File : mod_bosh.erl
%%% Author : Evgeniy Khramtsov <ekhramtsov@process-one.net>
%%% Purpose : This module acts as a bridge to ejabberd_bosh which implements
%%% the real stuff, this is to handle the new pluggable architecture
%%% for extending ejabberd's http service.
%%% Created : 20 Jul 2011 by Evgeniy Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2011 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%-------------------------------------------------------------------
-module(mod_bosh).
-author('steve@zeank.in-berlin.de').
%%-define(ejabberd_debug, true).
-behaviour(gen_mod).
-export([
start/2,
stop/1,
process/2,
open_session/2,
close_session/1,
find_session/1,
node_up/1,
node_down/1,
migrate/3
]).
-include("ejabberd.hrl").
-include("jlib.hrl").
-include("ejabberd_http.hrl").
-include("bosh.hrl").
-record(bosh, {sid, pid}).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
process([], #request{method = 'POST',
data = []}) ->
?DEBUG("Bad Request: no data", []),
{400, ?HEADER, {xmlelement, "h1", [],
[{xmlcdata, "400 Bad Request"}]}};
process([], #request{method = 'POST',
data = Data,
ip = IP}) ->
?DEBUG("Incoming data: ~s", [Data]),
ejabberd_bosh:process_request(Data, IP);
process([], #request{method = 'GET',
data = []}) ->
{200, ?HEADER, get_human_html_xmlel()};
process([], #request{method = 'OPTIONS',
data = []}) ->
{200, ?OPTIONS_HEADER, []};
process(_Path, _Request) ->
?DEBUG("Bad Request: ~p", [_Request]),
{400, ?HEADER, {xmlelement, "h1", [],
[{xmlcdata, "400 Bad Request"}]}}.
get_human_html_xmlel() ->
Heading = "ejabberd " ++ atom_to_list(?MODULE),
{xmlelement, "html", [{"xmlns", "http://www.w3.org/1999/xhtml"}],
[{xmlelement, "head", [],
[{xmlelement, "title", [], [{xmlcdata, Heading}]}]},
{xmlelement, "body", [],
[{xmlelement, "h1", [], [{xmlcdata, Heading}]},
{xmlelement, "p", [],
[{xmlcdata, "An implementation of "},
{xmlelement, "a",
[{"href", "http://xmpp.org/extensions/xep-0206.html"}],
[{xmlcdata, "XMPP over BOSH (XEP-0206)"}]}]},
{xmlelement, "p", [],
[{xmlcdata, "This web page is only informative. "
"To use HTTP-Bind you need a Jabber/XMPP client that supports it."}
]}
]}]}.
open_session(SID, Pid) ->
mnesia:dirty_write(#bosh{sid = SID, pid = Pid}).
close_session(SID) ->
mnesia:dirty_delete(bosh, SID).
find_session(SID) ->
Node = ejabberd_cluster:get_node(SID),
case rpc:call(Node, mnesia, dirty_read, [bosh, SID], 5000) of
[#bosh{pid = Pid}] ->
{ok, Pid};
_ ->
error
end.
migrate(_Node, _UpOrDown, After) ->
Rs = mnesia:dirty_select(
bosh,
[{#bosh{sid = '$1', pid = '$2', _ = '_'},
[],
['$$']}]),
lists:foreach(
fun([SID, Pid]) ->
case ejabberd_cluster:get_node(SID) of
Node when Node /= node() ->
ejabberd_bosh:migrate(Pid, Node, random:uniform(After));
_ ->
ok
end
end, Rs).
node_up(_Node) ->
copy_entries(mnesia:dirty_first(bosh)).
node_down(Node) when Node == node() ->
copy_entries(mnesia:dirty_first(bosh));
node_down(_) ->
ok.
copy_entries('$end_of_table') ->
ok;
copy_entries(Key) ->
case mnesia:dirty_read(bosh, Key) of
[#bosh{sid = SID} = Entry] ->
case ejabberd_cluster:get_node_new(SID) of
Node when node() /= Node ->
rpc:cast(Node, mnesia, dirty_write, [Entry]);
_ ->
ok
end;
_ ->
ok
end,
copy_entries(mnesia:dirty_next(bosh, Key)).
%%%----------------------------------------------------------------------
%%% BEHAVIOUR CALLBACKS
%%%----------------------------------------------------------------------
start(Host, _Opts) ->
start_hook_handler(),
setup_database(),
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
ChildSpec =
{Proc,
{ejabberd_tmp_sup, start_link,
[Proc, ejabberd_bosh]},
permanent,
infinity,
supervisor,
[ejabberd_tmp_sup]},
supervisor:start_child(ejabberd_sup, ChildSpec).
stop(Host) ->
Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
supervisor:terminate_child(ejabberd_sup, Proc),
supervisor:delete_child(ejabberd_sup, Proc).
setup_database() ->
mnesia:create_table(bosh,
[{ram_copies, [node()]},
{local_content, true},
{attributes, record_info(fields, bosh)}]),
mnesia:add_table_copy(bosh, node(), ram_copies).
start_hook_handler() ->
%% HACK: We need this in order to avoid
%% hooks processing more than once
%% when many vhosts are involved
%% TODO: get rid of this stuff
spawn(fun hook_handler/0).
hook_handler() ->
case catch register(ejabberd_bosh_hook_handler, self()) of
true ->
ejabberd_hooks:add(node_up, ?MODULE, node_up, 100),
ejabberd_hooks:add(node_down, ?MODULE, node_down, 100),
ejabberd_hooks:add(node_hash_update, ?MODULE, migrate, 100),
%% Stop if ejabberd_sup goes down
%% (i.e. the whole ejabberd goes down)
MRef = erlang:monitor(process, ejabberd_sup),
hook_handler_loop(MRef);
_ ->
ok
end.
hook_handler_loop(MRef) ->
receive
{'DOWN', MRef, _Type, _Object, _Info} ->
%% Unregister the hooks. I think this is useless, thus 'catch'
catch ejabberd_hooks:delete(node_up, ?MODULE, node_up, 100),
catch ejabberd_hooks:delete(node_down, ?MODULE, node_down, 100),
catch ejabberd_hooks:delete(node_hash_update, ?MODULE, migrate, 100),
ok;
_ ->
hook_handler_loop(MRef)
end.
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