Merge branch 'pg_prepared_statements' of https://github.com/sabudaye/ejabberd into sabudaye-pg_prepared_statements

Conflicts:
	ejabberd.yml.example
	src/ejabberd_sql.erl

src/ejabberd_option.erl

@@ -138,6 +138,7 @@
 -export([sql_password/0, sql_password/1]).
 -export([sql_pool_size/0, sql_pool_size/1]).
 -export([sql_port/0, sql_port/1]).
+-export([sql_prepared_statements/0, sql_prepared_statements/1]).
 -export([sql_query_timeout/0, sql_query_timeout/1]).
 -export([sql_queue_type/0, sql_queue_type/1]).
 -export([sql_server/0, sql_server/1]).
@@ -933,6 +934,13 @@ sql_port() ->
 sql_port(Host) ->
     ejabberd_config:get_option({sql_port, Host}).
 
+-spec sql_prepared_statements() -> boolean().
+sql_prepared_statements() ->
+    sql_prepared_statements(global).
+-spec sql_prepared_statements(global | binary()) -> boolean().
+sql_prepared_statements(Host) ->
+    ejabberd_config:get_option({sql_prepared_statements, Host}).
+
 -spec sql_query_timeout() -> pos_integer().
 sql_query_timeout() ->
     sql_query_timeout(global).

src/ejabberd_options.erl

@@ -380,6 +380,8 @@ opt_type(sql_type) ->
     econf:enum([mysql, pgsql, sqlite, mssql, odbc]);
 opt_type(sql_username) ->
     econf:binary();
+opt_type(sql_prepared_statements) ->
+    econf:bool();
 opt_type(trusted_proxies) ->
     econf:either(all, econf:list(econf:ip_mask()));
 opt_type(use_cache) ->
@@ -652,6 +654,7 @@ options() ->
      {sql_ssl_verify, false},
      {sql_start_interval, timer:seconds(30)},
      {sql_username, <<"ejabberd">>},
+     {sql_prepared_statements, true},
      {trusted_proxies, []},
      {validate_stream, false},
      {websocket_origin, []},

src/ejabberd_sql.erl

@@ -583,14 +583,23 @@ sql_query_internal(#sql_query{} = Query) ->
                     Key = {?PREPARE_KEY, Query#sql_query.hash},
                     case get(Key) of
                         undefined ->
+                            Host = State#state.host,
+                            PreparedStatements =
+                                ejabberd_option:sql_prepared_statements(Host),
+                            case PreparedStatements of
+                                false ->
+                                    put(Key, ignore);
+                                true ->
                                     case pgsql_prepare(Query, State) of
                                         {ok, _, _, _} ->
                                             put(Key, prepared);
                                         {error, Error} ->
-                                    ?ERROR_MSG("PREPARE failed for SQL query "
+                                            ?ERROR_MSG(
+                                               "PREPARE failed for SQL query "
                                                "at ~p: ~p",
                                                [Query#sql_query.loc, Error]),
                                             put(Key, ignore)
+                                    end
                             end;
                         _ ->
                             ok
@@ -599,7 +608,7 @@ sql_query_internal(#sql_query{} = Query) ->
                         prepared ->
                             pgsql_execute_sql_query(Query, State);
                         _ ->
-                            generic_sql_query(Query)
+                            pgsql_sql_query(Query)
                     end;
                 mysql ->
                     generic_sql_query(Query);
@@ -695,6 +704,24 @@ generic_escape() ->
 		in_array_string = fun(X) -> <<"'", (escape(X))/binary, "'">> end
                }.
 
+pgsql_sql_query(SQLQuery) ->
+    sql_query_format_res(
+      sql_query_internal(pgsql_sql_query_format(SQLQuery)),
+      SQLQuery).
+
+pgsql_sql_query_format(SQLQuery) ->
+    Args = (SQLQuery#sql_query.args)(pgsql_escape()),
+    (SQLQuery#sql_query.format_query)(Args).
+
+pgsql_escape() ->
+    #sql_escape{string = fun(X) -> <<"E'", (escape(X))/binary, "'">> end,
+		integer = fun(X) -> misc:i2l(X) end,
+		boolean = fun(true) -> <<"1">>;
+                             (false) -> <<"0">>
+                          end,
+		in_array_string = fun(X) -> <<"E'", (escape(X))/binary, "'">> end
+               }.
+
 sqlite_sql_query(SQLQuery) ->
     sql_query_format_res(
       sql_query_internal(sqlite_sql_query_format(SQLQuery)),