Use prepared statement with mysql

mix.exs

@@ -138,7 +138,7 @@ defmodule Ejabberd.MixProject do
                          {config(:zlib), {:ezlib, "~> 1.0"}},
                          {if_version_below('22', true), {:lager, "~> 3.9.1"}},
                          {config(:lua), {:luerl, "~> 1.0"}},
-                         {config(:mysql), {:p1_mysql, "~> 1.0.20"}},
+                         {config(:mysql), {:p1_mysql, git: "https://github.com/processone/p1_mysql.git", ref: "150c15b96d2fb84cb00e07cc53cd97ec72b77efc"}},
                          {config(:pgsql), {:p1_pgsql, "~> 1.1"}},
                          {config(:sqlite), {:sqlite3, "~> 1.1"}},
                          {config(:stun), {:stun, "~> 1.0"}}], do:

rebar.config

@@ -63,7 +63,7 @@
         {mqtree, ".*", {git, "https://github.com/processone/mqtree", {tag, "1.0.15"}}},
         {p1_acme, ".*", {git, "https://github.com/processone/p1_acme", {tag, "1.0.22"}}},
         {if_var_true, mysql,
-         {p1_mysql, ".*", {git, "https://github.com/processone/p1_mysql", {tag, "1.0.21"}}}},
+         {p1_mysql, ".*", {git, "https://github.com/processone/p1_mysql", "150c15b96d2fb84cb00e07cc53cd97ec72b77efc"}}},
         {p1_oauth2, ".*", {git, "https://github.com/processone/p1_oauth2", {tag, "0.6.11"}}},
         {if_var_true, pgsql,
          {p1_pgsql, ".*", {git, "https://github.com/processone/p1_pgsql", {tag, "1.1.22"}}}},

src/ejabberd_sql.erl

@@ -683,7 +683,14 @@ sql_query_internal(#sql_query{} = Query) ->
                             pgsql_sql_query(Query)
                     end;
                 mysql ->
+		    case {Query#sql_query.flags, ejabberd_option:sql_prepared_statements(State#state.host)} of
+			{1, _} ->
 			    generic_sql_query(Query);
+			{_, false} ->
+			    generic_sql_query(Query);
+			_ ->
+			    mysql_prepared_execute(Query, State)
+		    end;
                 sqlite ->
                     sqlite_sql_query(Query)
             end
@@ -862,6 +869,24 @@ pgsql_execute_sql_query(SQLQuery, State) ->
     Res = pgsql_execute_to_odbc(ExecuteRes),
     sql_query_format_res(Res, SQLQuery).
 
+mysql_prepared_execute(#sql_query{hash = Hash} = Query, State) ->
+    ValEsc = #sql_escape{like_escape = fun() -> ignore end, _ = fun(X) -> X end},
+    TypesEsc = #sql_escape{string = fun(_) -> string end,
+			   integer = fun(_) -> integer end,
+			   boolean = fun(_) -> bool end,
+			   in_array_string = fun(_) -> string end,
+			   like_escape = fun() -> ignore end},
+    Val = [X || X <- (Query#sql_query.args)(ValEsc), X /= ignore],
+    Types = [X || X <- (Query#sql_query.args)(TypesEsc), X /= ignore],
+    QueryFn = fun() ->
+	PrepEsc = #sql_escape{like_escape = fun() -> <<>> end, _ = fun(_) -> <<"?">> end},
+	(Query#sql_query.format_query)((Query#sql_query.args)(PrepEsc))
+	end,
+    QueryTimeout = query_timeout(State#state.host),
+    Res = p1_mysql_conn:prepared_query(State#state.db_ref, QueryFn, Hash, Val, Types,
+				       self(), [{timeout, QueryTimeout - 1000}]),
+    Res2 = mysql_to_odbc(Res),
+    sql_query_format_res(Res2, Query).
 
 sql_query_format_res({selected, _, Rows}, SQLQuery) ->
     Res =

src/ejabberd_sql_pt.erl

@@ -42,7 +42,8 @@
                 used_vars = [],
                 use_new_schema,
                 need_timestamp_pass = false,
-                need_array_pass = false}).
+                need_array_pass = false,
+                has_list = false}).
 
 -define(QUERY_RECORD, "sql_query").
 
@@ -268,9 +269,12 @@ parse1([$@, $( | S], Acc, State) ->
     Convert =
         case Type of
             integer ->
-                erl_syntax:application(
-                  erl_syntax:atom(binary_to_integer),
-                  [EVar]);
+                erl_syntax:if_expr([
+                    erl_syntax:clause(
+                        [erl_syntax:application(erl_syntax:atom(is_binary), [EVar])],
+                        [erl_syntax:application(erl_syntax:atom(binary_to_integer), [EVar])]),
+                    erl_syntax:clause([erl_syntax:atom(true)], [EVar])
+                    ]);
             string ->
                 EVar;
             timestamp ->
@@ -339,6 +343,7 @@ parse1([$%, $( | S], Acc, State) ->
                      erl_syntax:variable(Name)]),
                 State2#state{'query' = [[{var, Var, Type}] | State2#state.'query'],
                              need_array_pass = true,
+                             has_list = true,
                              args = [[Convert, ConvertArr] | State2#state.args],
                              params = [Var | State2#state.params],
                              param_pos = State2#state.param_pos + 1,
@@ -467,6 +472,7 @@ make_sql_query(State, Type) ->
     Hash = erlang:phash2(State#state{loc = undefined, use_new_schema = true}),
     SHash = <<"Q", (integer_to_binary(Hash))/binary>>,
     Query = pack_query(State#state.'query'),
+    Flags = case State#state.has_list of true -> 1; _ -> 0 end,
     EQuery =
         lists:flatmap(
           fun({str, S}) ->
@@ -515,6 +521,9 @@ make_sql_query(State, Type) ->
              none,
              [erl_syntax:tuple(State#state.res)]
             )])),
+      erl_syntax:record_field(
+          erl_syntax:atom(flags),
+          erl_syntax:abstract(Flags)),
       erl_syntax:record_field(
        erl_syntax:atom(loc),
         erl_syntax:abstract({get(?MOD), State#state.loc}))