mirror of
https://github.com/processone/ejabberd.git
synced 2024-11-22 16:20:52 +01:00
Lua script for cleaning redis sessions
Changes: 1. Added extra keys for tracking node -> session mapping 2. Lua script for clearing the sessions in redis itself.
This commit is contained in:
satish-olx
GitHub
parent
48be8e7b1e
commit
96e35a3248
@ -27,16 +27,17 @@
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-define(GEN_SERVER, p1_server).
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-endif.
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-behaviour(?GEN_SERVER).
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-define(DELETION_CURSOR_TIMEOUT_SEC, "30").
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-behaviour(ejabberd_sm).
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-export([init/0, set_session/1, delete_session/1,
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get_sessions/0, get_sessions/1, get_sessions/2,
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cache_nodes/1]).
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cache_nodes/1, clean_table/1, clean_table/0]).
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%% gen_server callbacks
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-export([init/1, handle_cast/2, handle_call/3, handle_info/2,
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terminate/2, code_change/3, start_link/0]).
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-include("ejabberd.hrl").
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-include("ejabberd_sm.hrl").
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-include("logger.hrl").
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@ -70,10 +71,12 @@ set_session(Session) ->
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SIDKey = sid_to_key(Session#session.sid),
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ServKey = server_to_key(element(2, Session#session.us)),
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USSIDKey = us_sid_to_key(Session#session.us, Session#session.sid),
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NodeHostKey = node_host_to_key(node(), element(2, Session#session.us)),
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case ejabberd_redis:multi(
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fun() ->
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ejabberd_redis:hset(USKey, SIDKey, T),
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ejabberd_redis:hset(ServKey, USSIDKey, T),
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ejabberd_redis:hset(NodeHostKey , <<USKey/binary, "||", SIDKey/binary>>, USSIDKey),
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ejabberd_redis:publish(
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?SM_KEY, term_to_binary({delete, Session#session.us}))
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end) of
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@ -89,10 +92,12 @@ delete_session(#session{sid = SID} = Session) ->
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SIDKey = sid_to_key(SID),
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ServKey = server_to_key(element(2, Session#session.us)),
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USSIDKey = us_sid_to_key(Session#session.us, SID),
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NodeHostKey = node_host_to_key(node(), element(2, Session#session.us)),
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case ejabberd_redis:multi(
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fun() ->
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ejabberd_redis:hdel(USKey, [SIDKey]),
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ejabberd_redis:hdel(ServKey, [USSIDKey]),
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ejabberd_redis:hdel(NodeHostKey, [<<USKey/binary, "||", SIDKey/binary>>]),
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ejabberd_redis:publish(
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?SM_KEY,
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term_to_binary({delete, Session#session.us}))
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@ -155,7 +160,7 @@ handle_info({redis_message, ?SM_KEY, Data}, State) ->
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end,
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{noreply, State};
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handle_info(Info, State) ->
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?ERROR_MSG("unexpected info: ~p", [Info]),
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?ERROR_MSG("unexpected info: ~p in cluster server", [Info]),
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{noreply, State}.
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terminate(_Reason, _State) ->
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@ -168,10 +173,12 @@ code_change(_OldVsn, State, _Extra) ->
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%%% Internal functions
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%%%===================================================================
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us_to_key({LUser, LServer}) ->
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<<"ejabberd:sm:", LUser/binary, "@", LServer/binary>>.
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SMPrefixKey = ?SM_KEY,
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<<SMPrefixKey/binary, ":", LUser/binary, "@", LServer/binary>>.
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server_to_key(LServer) ->
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<<"ejabberd:sm:", LServer/binary>>.
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SMPrefixKey = ?SM_KEY,
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<<SMPrefixKey/binary, ":", LServer/binary>>.
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us_sid_to_key(US, SID) ->
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term_to_binary({US, SID}).
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@ -179,33 +186,88 @@ us_sid_to_key(US, SID) ->
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sid_to_key(SID) ->
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term_to_binary(SID).
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node_session_deletion_cursor(Node, Host) when is_binary(Host) and is_binary(Node) ->
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NodeName = node_host_to_key(Node, Host),
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<<NodeName/binary, ":deletioncursor">>.
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node_host_to_key(Node, Host) when is_atom(Node) and is_binary(Host) ->
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NodeBin = atom_to_binary(node(), utf8),
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node_host_to_key(NodeBin, Host);
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node_host_to_key(NodeBin, Host) when is_binary(NodeBin) and is_binary(Host) ->
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HostKey = server_to_key(Host),
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<<HostKey/binary, ":node:", NodeBin/binary>>;
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node_host_to_key(_NodeBin, _Host) ->
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?ERROR_MSG("Invalid node type ", []).
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decode_session_list(Vals) ->
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[binary_to_term(Val) || {_, Val} <- Vals].
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clean_table() ->
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?DEBUG("Cleaning Redis SM table...", []),
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clean_table(node()).
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clean_table(Node) when is_atom(Node) ->
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clean_table(atom_to_binary(Node, utf8));
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clean_table(Node) when is_binary(Node) ->
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?DEBUG("Cleaning Redis SM table... ", []),
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try
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lists:foreach(
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fun(LServer) ->
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ServKey = server_to_key(LServer),
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{ok, Vals} = ejabberd_redis:hkeys(ServKey),
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{ok, _} =
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ejabberd_redis:multi(
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fun() ->
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lists:foreach(
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fun(USSIDKey) ->
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{US, SID} = binary_to_term(USSIDKey),
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if node(element(2, SID)) == node() ->
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USKey = us_to_key(US),
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SIDKey = sid_to_key(SID),
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ejabberd_redis:hdel(ServKey, [USSIDKey]),
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ejabberd_redis:hdel(USKey, [SIDKey]);
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true ->
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fun(Host) -> clean_node_sessions(Node, Host) end,
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ejabberd_sm:get_vh_by_backend(?MODULE)
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),
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ok
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end
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end, Vals)
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end)
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end, ejabberd_sm:get_vh_by_backend(?MODULE))
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catch _:{badmatch, {error, _}} ->
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?ERROR_MSG("failed to clean redis c2s sessions", [])
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catch E:R ->
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?ERROR_MSG("failed to clean redis c2s sessions due to ~p: ~p", [E, R]),
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{error, R}
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end;
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clean_table(_) ->
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?ERROR_MSG("Wrong node data type in clean table call ", []).
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clean_node_sessions(Node, Host) ->
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case load_script() of
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{ok , SHA} ->
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clean_node_sessions(Node, Host, SHA);
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Error ->
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?ERROR_MSG("Failure in generating the SHA ~p", [Error])
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end.
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clean_node_sessions(Node, Host, SHA) ->
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?INFO_MSG("Cleaning node sessions for node ~p with host ~p ", [Node, Host]),
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case ejabberd_redis:q(["EVALSHA", SHA,
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3,
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node_host_to_key(Node, Host),
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server_to_key(Host),
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node_session_deletion_cursor(Node, Host),
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1000
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]) of
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{ok, <<"0">>} ->
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?DEBUG("Cleaned node sessions for node ~p with host ~p ", [Node, Host]);
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{ok, Cursor} ->
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?DEBUG("Cleaning redis sessions with cursor ~p ", [Cursor]),
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clean_node_sessions(Node, Host, SHA);
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Error ->
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?INFO_MSG("Error in redis clean up: ~p", [Error]),
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throw(Error)
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end.
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load_script() ->
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ejabberd_redis:q(["SCRIPT", "LOAD",
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["redis.replicate_commands() ",
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"local cursor = redis.call('GET', KEYS[3]) or 0 ",
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"local scan_result = redis.call('HSCAN', KEYS[1], cursor, 'COUNT', ARGV[1]) ",
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"local newcursor = scan_result[1] ",
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"local cursor = redis.call('SET', KEYS[3], newcursor) ",
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"redis.call('EXPIRE', KEYS[3], ", ?DELETION_CURSOR_TIMEOUT_SEC , ") ",
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"for key,value in ipairs(scan_result[2]) do ",
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"local uskey, sidkey = string.match(value, '(.*)||(.*)') ",
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"if uskey and sidkey then ",
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"redis.call('HDEL', uskey, sidkey) ",
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"redis.call('HDEL', KEYS[1], value) ",
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"else ",
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"redis.call('HDEL', KEYS[2], value) ",
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"end ",
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"end ",
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" return newcursor "
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]
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]).
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