| 1 |
|
-module(ejabberd_sm_cets). |
| 2 |
|
|
| 3 |
|
-behavior(ejabberd_sm_backend). |
| 4 |
|
|
| 5 |
|
-include("mongoose.hrl"). |
| 6 |
|
-include("session.hrl"). |
| 7 |
|
|
| 8 |
|
-export([init/1, |
| 9 |
|
get_sessions/0, |
| 10 |
|
get_sessions/1, |
| 11 |
|
get_sessions/2, |
| 12 |
|
get_sessions/3, |
| 13 |
|
set_session/4, |
| 14 |
|
delete_session/4, |
| 15 |
|
cleanup/1, |
| 16 |
|
total_count/0, |
| 17 |
|
unique_count/0]). |
| 18 |
|
|
| 19 |
|
-define(TABLE, cets_session). |
| 20 |
|
|
| 21 |
|
-spec init(map()) -> any(). |
| 22 |
|
init(_Opts) -> |
| 23 |
33 |
cets:start(?TABLE, #{}), |
| 24 |
33 |
cets_discovery:add_table(mongoose_cets_discovery, ?TABLE). |
| 25 |
|
|
| 26 |
|
-spec get_sessions() -> [ejabberd_sm:session()]. |
| 27 |
|
get_sessions() -> |
| 28 |
119 |
tuples_to_sessions(ets:tab2list(?TABLE)). |
| 29 |
|
|
| 30 |
|
-spec get_sessions(jid:lserver()) -> [ejabberd_sm:session()]. |
| 31 |
|
get_sessions(Server) -> |
| 32 |
|
%% This is not a full table scan. From the ETS docs: |
| 33 |
|
%% For ordered_set a partially bound key will limit the traversal to only |
| 34 |
|
%% scan a subset of the table based on term order. |
| 35 |
|
%% A partially bound key is either a list or a tuple with |
| 36 |
|
%% a prefix that is fully bound. |
| 37 |
66 |
R = {{Server, '_', '_', '_'}, '_', '_'}, |
| 38 |
66 |
Xs = ets:match_object(?TABLE, R), |
| 39 |
66 |
tuples_to_sessions(Xs). |
| 40 |
|
|
| 41 |
|
-spec get_sessions(jid:luser(), jid:lserver()) -> [ejabberd_sm:session()]. |
| 42 |
|
get_sessions(User, Server) -> |
| 43 |
46433 |
R = {{Server, User, '_', '_'}, '_', '_'}, |
| 44 |
46433 |
Xs = ets:match_object(?TABLE, R), |
| 45 |
46433 |
tuples_to_sessions(Xs). |
| 46 |
|
|
| 47 |
|
-spec get_sessions(jid:luser(), jid:lserver(), jid:lresource()) -> |
| 48 |
|
[ejabberd_sm:session()]. |
| 49 |
|
get_sessions(User, Server, Resource) -> |
| 50 |
27715 |
R = {{Server, User, Resource, '_'}, '_', '_'}, |
| 51 |
27715 |
Xs = ets:match_object(?TABLE, R), |
| 52 |
|
%% TODO these sessions should be deduplicated. |
| 53 |
|
%% It is possible, that after merging two cets tables we could end up |
| 54 |
|
%% with sessions from two nodes for the same full jid. |
| 55 |
|
%% One of the sessions must be killed. |
| 56 |
|
%% We can detect duplicates on the merging step or on reading (or both). |
| 57 |
27715 |
tuples_to_sessions(Xs). |
| 58 |
|
|
| 59 |
|
-spec set_session(User :: jid:luser(), |
| 60 |
|
Server :: jid:lserver(), |
| 61 |
|
Resource :: jid:lresource(), |
| 62 |
|
Session :: ejabberd_sm:session()) -> ok | {error, term()}. |
| 63 |
|
set_session(_User, _Server, _Resource, Session) -> |
| 64 |
14846 |
cets:insert(?TABLE, session_to_tuple(Session)). |
| 65 |
|
|
| 66 |
|
-spec delete_session(SID :: ejabberd_sm:sid(), |
| 67 |
|
User :: jid:luser(), |
| 68 |
|
Server :: jid:lserver(), |
| 69 |
|
Resource :: jid:lresource()) -> ok. |
| 70 |
|
delete_session(SID, User, Server, Resource) -> |
| 71 |
7941 |
cets:delete(?TABLE, make_key(User, Server, Resource, SID)). |
| 72 |
|
|
| 73 |
|
%% cleanup is called on each node in the cluster, when Node is down |
| 74 |
|
-spec cleanup(atom()) -> any(). |
| 75 |
|
cleanup(Node) -> |
| 76 |
:-( |
KeyPattern = {'_', '_', '_', {'_', '$1'}}, |
| 77 |
:-( |
Guard = {'==', {node, '$1'}, Node}, |
| 78 |
:-( |
R = {KeyPattern, '_', '_'}, |
| 79 |
:-( |
cets:ping_all(?TABLE), |
| 80 |
|
%% This is a full table scan, but cleanup is rare. |
| 81 |
:-( |
Tuples = ets:select(?TABLE, [{R, [Guard], ['$_']}]), |
| 82 |
:-( |
cets:delete_many(?TABLE, [Key || {Key, _, _} <- Tuples]), |
| 83 |
:-( |
lists:foreach(fun(Tuple) -> |
| 84 |
:-( |
Session = tuple_to_session(Tuple), |
| 85 |
:-( |
ejabberd_sm:run_session_cleanup_hook(Session) |
| 86 |
|
end, Tuples). |
| 87 |
|
|
| 88 |
|
-spec total_count() -> integer(). |
| 89 |
|
total_count() -> |
| 90 |
252 |
ets:info(?TABLE, size). |
| 91 |
|
|
| 92 |
|
%% Counts merged by US |
| 93 |
|
-spec unique_count() -> integer(). |
| 94 |
|
unique_count() -> |
| 95 |
245 |
compute_unique(ets:first(?TABLE), 0). |
| 96 |
|
|
| 97 |
|
compute_unique('$end_of_table', Sum) -> |
| 98 |
245 |
Sum; |
| 99 |
|
compute_unique({S, U, _, _} = Key, Sum) -> |
| 100 |
641 |
Key2 = ets:next(?TABLE, Key), |
| 101 |
641 |
case Key2 of |
| 102 |
|
{S, U, _, _} -> |
| 103 |
8 |
compute_unique(Key2, Sum); |
| 104 |
|
_ -> |
| 105 |
633 |
compute_unique(Key2, Sum + 1) |
| 106 |
|
end. |
| 107 |
|
|
| 108 |
|
session_to_tuple(#session{sid = SID, usr = {U, S, R}, priority = Prio, info = Info}) -> |
| 109 |
14846 |
{make_key(U, S, R, SID), Prio, Info}. |
| 110 |
|
|
| 111 |
|
make_key(User, Server, Resource, SID) -> |
| 112 |
22787 |
{Server, User, Resource, SID}. |
| 113 |
|
|
| 114 |
|
tuple_to_session({{S, U, R, SID}, Prio, Info}) -> |
| 115 |
58293 |
#session{sid = SID, usr = {U, S, R}, us = {U, S}, priority = Prio, info = Info}. |
| 116 |
|
|
| 117 |
|
tuples_to_sessions(Xs) -> |
| 118 |
74333 |
[tuple_to_session(X) || X <- Xs]. |