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mod_caps: reduce memory and remove mnesia lock
SVN Revision: 2050
This commit is contained in:
Christophe Romain
parent
5ae96e4065
commit
0ed0c45aba
@ -17,6 +17,9 @@
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* src/mod_pubsub/gen_pubsub_node.erl: Likewise
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* src/mod_pubsub/gen_pubsub_nodetree.erl: Likewise
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* src/mod_caps.erl: Reduce memory consumption and remove mnesia table
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locking, improving performances
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2009-04-28 Badlop <badlop@process-one.net>
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* src/ejabberd_hooks.erl: Support distributed hooks (EJAB-829)
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@ -22,6 +22,8 @@
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%% 2009, improvements from Process-One to support correct PEP handling
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%%% through s2s, use less memory, and speedup global caps handling
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%%%----------------------------------------------------------------------
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-module(mod_caps).
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@ -63,7 +65,7 @@
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-define(CAPS_QUERY_TIMEOUT, 60000). % 1mn without answer, consider client never answer
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-record(caps, {node, version, exts}).
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-record(caps_features, {node_pair, features}).
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-record(caps_features, {node_pair, features = []}).
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-record(user_caps, {jid, caps}).
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-record(user_caps_resources, {uid, resource}).
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-record(state, {host,
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@ -100,7 +102,7 @@ read_caps([], Result) ->
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%% get_caps reads user caps from database
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get_caps(JID) ->
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case catch mnesia:dirty_read({user_caps, list_to_binary(jlib:jid_to_string(JID))}) of
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case catch mnesia:dirty_read({user_caps, jid_to_binary(JID)}) of
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[#user_caps{caps=Caps}] ->
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Caps;
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_ ->
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@ -110,16 +112,15 @@ get_caps(JID) ->
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%% clear_caps removes user caps from database
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clear_caps(JID) ->
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{U, S, R} = jlib:jid_tolower(JID),
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BJID = list_to_binary(jlib:jid_to_string(JID)),
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BUID = list_to_binary(jlib:jid_to_string({U, S, []})),
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BJID = jid_to_binary(JID),
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BUID = jid_to_binary({U, S, []}),
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catch mnesia:dirty_delete({user_caps, BJID}),
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catch mnesia:dirty_delete_object(#user_caps_resources{uid = BUID, resource = list_to_binary(R)}),
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ok.
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%% give default user resource
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get_user_resources(LUser, LServer) ->
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BUID = list_to_binary(jlib:jid_to_string({LUser, LServer, []})),
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case catch mnesia:dirty_read({user_caps_resources, BUID}) of
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case catch mnesia:dirty_read({user_caps_resources, jid_to_binary({LUser, LServer, []})}) of
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{'EXIT', _} ->
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[];
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Resources ->
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@ -196,19 +197,32 @@ receive_packet(_, _, _) ->
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receive_packet(_JID, From, To, Packet) ->
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receive_packet(From, To, Packet).
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jid_to_binary(JID) ->
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list_to_binary(jlib:jid_to_string(JID)).
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caps_to_binary(#caps{node = Node, version = Version, exts = Exts}) ->
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BExts = [list_to_binary(Ext) || Ext <- Exts],
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#caps{node = list_to_binary(Node), version = list_to_binary(Version), exts = BExts}.
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node_to_binary(Node, SubNode) ->
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{list_to_binary(Node), list_to_binary(SubNode)}.
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features_to_binary(L) -> [list_to_binary(I) || I <- L].
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binary_to_features(L) -> [binary_to_list(I) || I <- L].
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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init([Host, _Opts]) ->
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mnesia:create_table(caps_features,
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[{ram_copies, [node()]},
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[{disc_copies, [node()]},
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{attributes, record_info(fields, caps_features)}]),
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mnesia:create_table(user_caps,
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[{disc_copies, [node()]},
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[{ram_copies, [node()]},
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{attributes, record_info(fields, user_caps)}]),
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mnesia:create_table(user_caps_resources,
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[{disc_copies, [node()]},
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[{ram_copies, [node()]},
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{type, bag},
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{attributes, record_info(fields, user_caps_resources)}]),
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mnesia:delete_table(user_caps_default),
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@ -220,26 +234,21 @@ init([Host, _Opts]) ->
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maybe_get_features(#caps{node = Node, version = Version, exts = Exts}) ->
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SubNodes = [Version | Exts],
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F = fun() ->
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%% Make sure that we have all nodes we need to know.
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%% If a single one is missing, we wait for more disco
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%% responses.
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lists:foldl(fun(SubNode, Acc) ->
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case lists:foldl(fun(SubNode, Acc) ->
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case Acc of
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fail -> fail;
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_ ->
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case mnesia:read({caps_features, {Node, SubNode}}) of
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case mnesia:dirty_read({caps_features, {Node, SubNode}}) of
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[] -> fail;
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[#caps_features{features = Features}] -> Features ++ Acc
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[#caps_features{features = Features}] -> Features ++ Acc %% TODO binary
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end
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end
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end, [], SubNodes)
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end,
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case mnesia:transaction(F) of
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{atomic, fail} ->
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wait;
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{atomic, Features} ->
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{ok, Features}
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end, [], SubNodes) of
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fail -> wait;
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Features -> {ok, Features}
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end.
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timestamp() ->
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@ -249,7 +258,7 @@ timestamp() ->
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handle_call({get_features, Caps}, From, State) ->
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case maybe_get_features(Caps) of
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{ok, Features} ->
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{reply, Features, State};
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{reply, binary_to_features(Features), State};
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wait ->
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gen_server:cast(self(), visit_feature_queries),
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Timeout = timestamp() + 10,
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@ -268,30 +277,29 @@ handle_cast({note_caps, From,
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%% XXX: this leads to race conditions where ejabberd will send
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%% lots of caps disco requests.
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{U, S, R} = jlib:jid_tolower(From),
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BJID = list_to_binary(jlib:jid_to_string(From)),
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mnesia:dirty_write(#user_caps{jid = BJID, caps = Caps}),
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BJID = jid_to_binary(From),
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mnesia:dirty_write(#user_caps{jid = BJID, caps = caps_to_binary(Caps)}),
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case ejabberd_sm:get_user_resources(U, S) of
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[] ->
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% only store resources of caps aware external contacts
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BUID = list_to_binary(jlib:jid_to_string(jlib:jid_remove_resource(From))),
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BUID = jid_to_binary({U, S, []}),
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mnesia:dirty_write(#user_caps_resources{uid = BUID, resource = list_to_binary(R)});
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_ ->
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ok
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end,
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SubNodes = [Version | Exts],
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%% Now, find which of these are not already in the database.
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Fun = fun() ->
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lists:foldl(fun(SubNode, Acc) ->
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case mnesia:read({caps_features, {Node, SubNode}}) of
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SubNodes = [Version | Exts],
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case lists:foldl(fun(SubNode, Acc) ->
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case mnesia:dirty_read({caps_features, node_to_binary(Node, SubNode)}) of
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[] ->
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[SubNode | Acc];
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_ ->
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Acc
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end
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end, [], SubNodes)
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end,
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case mnesia:transaction(Fun) of
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{atomic, Missing} ->
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end, [], SubNodes) of
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[] ->
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{noreply, State};
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Missing ->
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%% For each unknown caps "subnode", we send a disco request.
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NewRequests = lists:foldl(
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fun(SubNode, Dict) ->
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@ -308,12 +316,9 @@ handle_cast({note_caps, From,
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(Host, ID, ?MODULE, handle_disco_response),
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ejabberd_router:route(jlib:make_jid("", Host, ""), From, Stanza),
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timer:send_after(?CAPS_QUERY_TIMEOUT, self(), {disco_timeout, ID}),
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?DICT:store(ID, {Node, SubNode}, Dict)
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?DICT:store(ID, node_to_binary(Node, SubNode), Dict)
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end, Requests, Missing),
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{noreply, State#state{disco_requests = NewRequests}};
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Error ->
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?ERROR_MSG("Transaction failed: ~p", [Error]),
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{noreply, State}
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{noreply, State#state{disco_requests = NewRequests}}
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end;
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handle_cast({disco_response, From, _To,
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#iq{type = Type, id = ID,
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@ -322,18 +327,14 @@ handle_cast({disco_response, From, _To,
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case {Type, SubEls} of
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{result, [{xmlelement, "query", _Attrs, Els}]} ->
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case ?DICT:find(ID, Requests) of
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{ok, {Node, SubNode}} ->
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{ok, BinaryNode} ->
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Features =
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lists:flatmap(fun({xmlelement, "feature", FAttrs, _}) ->
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[xml:get_attr_s("var", FAttrs)];
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(_) ->
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[]
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end, Els),
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mnesia:transaction(
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fun() ->
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mnesia:write(#caps_features{node_pair = {Node, SubNode},
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features = Features})
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end),
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mnesia:dirty_write(#caps_features{node_pair = BinaryNode, features = features_to_binary(Features)}),
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gen_server:cast(self(), visit_feature_queries);
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error ->
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?ERROR_MSG("ID '~s' matches no query", [ID])
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@ -341,13 +342,8 @@ handle_cast({disco_response, From, _To,
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{error, _} ->
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%% XXX: if we get error, we cache empty feature not to probe the client continuously
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case ?DICT:find(ID, Requests) of
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{ok, {Node, SubNode}} ->
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Features = [],
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mnesia:transaction(
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fun() ->
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mnesia:write(#caps_features{node_pair = {Node, SubNode},
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features = Features})
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end),
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{ok, BinaryNode} ->
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mnesia:write(#caps_features{node_pair = BinaryNode}),
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gen_server:cast(self(), visit_feature_queries);
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error ->
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?ERROR_MSG("ID '~s' matches no query", [ID])
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