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-module(ejabberd_sm_cets). |
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-behavior(ejabberd_sm_backend). |
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-include("mongoose.hrl"). |
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-include("session.hrl"). |
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-export([init/1, |
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get_sessions/0, |
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get_sessions/1, |
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get_sessions/2, |
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get_sessions/3, |
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set_session/4, |
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delete_session/4, |
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cleanup/1, |
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total_count/0, |
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unique_count/0]). |
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-define(TABLE, cets_session). |
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-spec init(map()) -> any(). |
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init(_Opts) -> |
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cets:start(?TABLE, #{}), |
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cets_discovery:add_table(mongoose_cets_discovery, ?TABLE). |
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-spec get_sessions() -> [ejabberd_sm:session()]. |
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get_sessions() -> |
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tuples_to_sessions(ets:tab2list(?TABLE)). |
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-spec get_sessions(jid:lserver()) -> [ejabberd_sm:session()]. |
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get_sessions(Server) -> |
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%% This is not a full table scan. From the ETS docs: |
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%% For ordered_set a partially bound key will limit the traversal to only |
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%% scan a subset of the table based on term order. |
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%% A partially bound key is either a list or a tuple with |
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%% a prefix that is fully bound. |
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R = {{Server, '_', '_', '_'}, '_', '_'}, |
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Xs = ets:match_object(?TABLE, R), |
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tuples_to_sessions(Xs). |
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-spec get_sessions(jid:luser(), jid:lserver()) -> [ejabberd_sm:session()]. |
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get_sessions(User, Server) -> |
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R = {{Server, User, '_', '_'}, '_', '_'}, |
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Xs = ets:match_object(?TABLE, R), |
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tuples_to_sessions(Xs). |
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-spec get_sessions(jid:luser(), jid:lserver(), jid:lresource()) -> |
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[ejabberd_sm:session()]. |
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get_sessions(User, Server, Resource) -> |
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R = {{Server, User, Resource, '_'}, '_', '_'}, |
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Xs = ets:match_object(?TABLE, R), |
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%% TODO these sessions should be deduplicated. |
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%% It is possible, that after merging two cets tables we could end up |
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%% with sessions from two nodes for the same full jid. |
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%% One of the sessions must be killed. |
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%% We can detect duplicates on the merging step or on reading (or both). |
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tuples_to_sessions(Xs). |
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-spec set_session(User :: jid:luser(), |
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Server :: jid:lserver(), |
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Resource :: jid:lresource(), |
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Session :: ejabberd_sm:session()) -> ok | {error, term()}. |
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set_session(_User, _Server, _Resource, Session) -> |
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cets:insert(?TABLE, session_to_tuple(Session)). |
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-spec delete_session(SID :: ejabberd_sm:sid(), |
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User :: jid:luser(), |
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Server :: jid:lserver(), |
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Resource :: jid:lresource()) -> ok. |
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delete_session(SID, User, Server, Resource) -> |
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cets:delete(?TABLE, make_key(User, Server, Resource, SID)). |
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%% cleanup is called on each node in the cluster, when Node is down |
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-spec cleanup(atom()) -> any(). |
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cleanup(Node) -> |
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:-( |
KeyPattern = {'_', '_', '_', {'_', '$1'}}, |
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:-( |
Guard = {'==', {node, '$1'}, Node}, |
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:-( |
R = {KeyPattern, '_', '_'}, |
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:-( |
cets:ping_all(?TABLE), |
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%% This is a full table scan, but cleanup is rare. |
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:-( |
Tuples = ets:select(?TABLE, [{R, [Guard], ['$_']}]), |
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:-( |
lists:foreach(fun({_Key, _, _} = Tuple) -> |
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:-( |
Session = tuple_to_session(Tuple), |
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ejabberd_sm:run_session_cleanup_hook(Session) |
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end, Tuples), |
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%% We don't need to replicate deletes |
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%% We remove the local content here |
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:-( |
ets:select_delete(?TABLE, [{R, [Guard], [true]}]). |
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-spec total_count() -> integer(). |
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total_count() -> |
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ets:info(?TABLE, size). |
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%% Counts merged by US |
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-spec unique_count() -> integer(). |
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unique_count() -> |
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compute_unique(ets:first(?TABLE), 0). |
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compute_unique('$end_of_table', Sum) -> |
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Sum; |
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compute_unique({S, U, _, _} = Key, Sum) -> |
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Key2 = ets:next(?TABLE, Key), |
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case Key2 of |
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{S, U, _, _} -> |
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compute_unique(Key2, Sum); |
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_ -> |
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compute_unique(Key2, Sum + 1) |
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end. |
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session_to_tuple(#session{sid = SID, usr = {U, S, R}, priority = Prio, info = Info}) -> |
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{make_key(U, S, R, SID), Prio, Info}. |
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make_key(User, Server, Resource, SID) -> |
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{Server, User, Resource, SID}. |
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tuple_to_session({{S, U, R, SID}, Prio, Info}) -> |
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#session{sid = SID, usr = {U, S, R}, us = {U, S}, priority = Prio, info = Info}. |
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tuples_to_sessions(Xs) -> |
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[tuple_to_session(X) || X <- Xs]. |