mirror of
https://github.com/processone/ejabberd.git
synced 2024-10-13 15:16:49 +02:00
158 lines
4.7 KiB
Erlang
158 lines
4.7 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% Created : 16 Jan 2017 by Evgeny Khramtsov <ekhramtsov@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2018 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%-------------------------------------------------------------------
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-module(mod_proxy65_mnesia).
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-behaviour(gen_server).
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-behaviour(mod_proxy65).
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%% API
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-export([init/0, register_stream/2, unregister_stream/1, activate_stream/4]).
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-export([start_link/0]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-include("logger.hrl").
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-record(bytestream,
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{sha1 = <<"">> :: binary() | '$1',
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target :: pid() | '_',
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initiator :: pid() | '_' | undefined,
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active = false :: boolean() | '_',
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jid_i :: undefined | binary() | '_'}).
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-record(state, {}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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init() ->
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Spec = {?MODULE, {?MODULE, start_link, []}, transient,
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5000, worker, [?MODULE]},
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supervisor:start_child(ejabberd_backend_sup, Spec).
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register_stream(SHA1, StreamPid) ->
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F = fun () ->
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case mnesia:read(bytestream, SHA1, write) of
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[] ->
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mnesia:write(#bytestream{sha1 = SHA1,
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target = StreamPid});
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[#bytestream{target = Pid, initiator = undefined} =
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ByteStream] when is_pid(Pid), Pid /= StreamPid ->
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mnesia:write(ByteStream#bytestream{
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initiator = StreamPid})
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end
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end,
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case mnesia:transaction(F) of
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{atomic, ok} ->
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ok;
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{aborted, Reason} ->
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?ERROR_MSG("Mnesia transaction failed: ~p", [Reason]),
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{error, Reason}
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end.
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unregister_stream(SHA1) ->
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F = fun () -> mnesia:delete({bytestream, SHA1}) end,
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case mnesia:transaction(F) of
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{atomic, ok} ->
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ok;
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{aborted, Reason} ->
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?ERROR_MSG("Mnesia transaction failed: ~p", [Reason]),
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{error, Reason}
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end.
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activate_stream(SHA1, Initiator, MaxConnections, _Node) ->
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case gen_server:call(?MODULE,
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{activate_stream, SHA1, Initiator, MaxConnections}) of
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{atomic, {ok, IPid, TPid}} ->
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{ok, IPid, TPid};
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{atomic, {limit, IPid, TPid}} ->
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{error, {limit, IPid, TPid}};
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{atomic, conflict} ->
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{error, conflict};
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{atomic, notfound} ->
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{error, notfound};
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Err ->
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{error, Err}
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end.
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%%%===================================================================
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%%% gen_server callbacks
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%%%===================================================================
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init([]) ->
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ejabberd_mnesia:create(?MODULE, bytestream,
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[{ram_copies, [node()]},
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{attributes, record_info(fields, bytestream)}]),
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{ok, #state{}}.
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handle_call({activate_stream, SHA1, Initiator, MaxConnections}, _From, State) ->
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F = fun () ->
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case mnesia:read(bytestream, SHA1, write) of
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[#bytestream{target = TPid, initiator = IPid} =
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ByteStream] when is_pid(TPid), is_pid(IPid) ->
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ActiveFlag = ByteStream#bytestream.active,
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if ActiveFlag == false ->
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ConnsPerJID = mnesia:select(
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bytestream,
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[{#bytestream{sha1 = '$1',
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jid_i = Initiator,
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_ = '_'},
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[], ['$1']}]),
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if length(ConnsPerJID) < MaxConnections ->
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mnesia:write(
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ByteStream#bytestream{active = true,
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jid_i = Initiator}),
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{ok, IPid, TPid};
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true ->
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{limit, IPid, TPid}
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end;
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true ->
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conflict
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end;
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_ ->
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notfound
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end
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end,
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Reply = mnesia:transaction(F),
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{reply, Reply, State};
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handle_call(_Request, _From, State) ->
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Reply = ok,
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{reply, Reply, State}.
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handle_cast(_Msg, State) ->
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{noreply, State}.
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handle_info(_Info, State) ->
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{noreply, State}.
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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