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* src/odbc/ejabberd_odbc.erl: Restart the database connection when it's lost or it reaches timeout. Set transaction isolation level to SERIALIZABLE when establishing connection.

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SVN Revision: 1510
This commit is contained in:
Jérôme Sautret 2008-08-04 13:41:16 +00:00
parent bc8fd0607b
commit 60308df929
1 changed files with 27 additions and 8 deletions
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35
src/odbc/ejabberd_odbc.erl
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@ -16,7 +16,7 @@
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
@ -166,13 +166,27 @@ init([Host]) ->
%% {stop, Reason, State} (terminate/2 is called)
%%----------------------------------------------------------------------
handle_call({sql_query, Query}, _From, State) ->
Reply = sql_query_internal(State, Query),
{reply, Reply, State};
case sql_query_internal(State, Query) of
% error returned by MySQL driver
{error, "query timed out"} = Reply ->
{stop, timeout, Reply, State};
% error returned by MySQL driver
{error, "Failed sending data on socket"++_} = Reply ->
{stop, closed, Reply, State};
Reply ->
{reply, Reply, State}
end;
handle_call({sql_transaction, F}, _From, State) ->
Reply = execute_transaction(State, F, ?MAX_TRANSACTION_RESTARTS),
{reply, Reply, State};
case execute_transaction(State, F, ?MAX_TRANSACTION_RESTARTS) of
% error returned by MySQL driver
{error, "query timed out"} ->
{stop, timeout, State};
% error returned by MySQL driver
{error, "Failed sending data on socket"++_} = Reply ->
{stop, closed, Reply, State};
Reply ->
{reply, Reply, State}
end;
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
@ -308,7 +322,12 @@ mysql_connect(Server, Port, DB, Username, Password) ->
case mysql_conn:start(Server, Port, Username, Password, DB, NoLogFun) of
{ok, Ref} ->
erlang:monitor(process, Ref),
mysql_conn:fetch(Ref, ["set names 'utf8';"], self()),
mysql_conn:fetch(Ref, ["set names 'utf8';"], self()),
% needed to ensure the order of queries, specifically at
% roster subscription time (this can also be set-up in the
% MySQL configuration, but not at the database level):
mysql_conn:fetch(Ref, ["SET SESSION TRANSACTION ISOLATION LEVEL "
"SERIALIZABLE;"], self()),
{ok, #state{db_ref = Ref, db_type = mysql}};
{error, Reason} ->
?ERROR_MSG("MySQL connection failed: ~p~n", [Reason]),