[tarantool-patches] [PATCH v1 2/2] sql: prevent executing crossengine sql

[Kirill Shcherbatov]

Some sql requests are complex and could contain R/W with
multiple spaces. As we have no ability to make such changes
transactionaly, we have to dissallow such requests. This mean
that we shouldn't create triggers on memtex spaces writing
something in vinyl and so on.

Closes #3551
---
 src/box/sql.c              |  11 +++++
 test/sql/triggers.result   | 120 +++++++++++++++++++++++++++++++++++++++++++++
 test/sql/triggers.test.lua |  53 ++++++++++++++++++++
 3 files changed, 184 insertions(+)

diff --git a/src/box/sql.c b/src/box/sql.c
index d48c3cf..a964fcb 100644
--- a/src/box/sql.c
+++ b/src/box/sql.c
@@ -1118,12 +1118,23 @@ cursor_seek(BtCursor *pCur, int *pRes)
 		return SQL_TARANTOOL_ITERATOR_FAIL;
 	}
 
+	struct space *space = pCur->space;
+	struct txn *txn = NULL;
+
+	if (space->def->id != 0) {
+		if (txn_begin_ro_stmt(space, &txn) != 0)
+			return SQL_TARANTOOL_ERROR;
+	}
 	struct iterator *it = index_create_iterator(pCur->index, pCur->iter_type,
 						    key, part_count);
 	if (it == NULL) {
+		if (txn != NULL)
+			txn_rollback_stmt();
 		pCur->eState = CURSOR_INVALID;
 		return SQL_TARANTOOL_ITERATOR_FAIL;
 	}
+	if (txn != NULL)
+		txn_commit_ro_stmt(txn);
 	pCur->iter = it;
 	pCur->eState = CURSOR_VALID;
 
diff --git a/test/sql/triggers.result b/test/sql/triggers.result
index dc0a2e5..a692b89 100644
--- a/test/sql/triggers.result
+++ b/test/sql/triggers.result
@@ -246,3 +246,123 @@ box.sql.execute("DROP VIEW V1;")
 box.sql.execute("DROP TABLE T1;")
 ---
 ...
+--
+-- gh-3531: Assertion with trigger and two storage engines
+--
+-- Case 1: Src 'vinyl' table; Dst 'memtx' table
+box.sql.execute("PRAGMA sql_default_engine ('vinyl');")
+---
+...
+box.sql.execute("CREATE TABLE m (s1 SCALAR PRIMARY KEY);")
+---
+...
+box.sql.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SET s2 = DATETIME('now'); END;")
+---
+...
+box.sql.execute("PRAGMA sql_default_engine('memtx');")
+---
+...
+box.sql.execute("CREATE TABLE n (s1 CHAR PRIMARY KEY, s2 char);")
+---
+...
+box.sql.execute("INSERT INTO m VALUES ('');")
+---
+...
+box.sql.execute("INSERT INTO n VALUES ('',null);")
+---
+...
+box.sql.execute("UPDATE m SET s1 = 'The Rain In Spain';")
+---
+- error: A multi-statement transaction can not use multiple storage engines
+...
+-- ANALYZE operates with _sql_stat{1,4} tables should work
+box.sql.execute("ANALYZE m;")
+---
+...
+box.sql.execute("DROP TABLE m;")
+---
+...
+box.sql.execute("DROP TABLE n;")
+---
+...
+-- Case 2: Src 'memtx' table; Dst 'vinyl' table
+box.sql.execute("PRAGMA sql_default_engine ('memtx');")
+---
+...
+box.sql.execute("CREATE TABLE m (s1 SCALAR PRIMARY KEY);")
+---
+...
+box.sql.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SET s2 = DATETIME('now'); END;")
+---
+...
+box.sql.execute("PRAGMA sql_default_engine('vinyl');")
+---
+...
+box.sql.execute("CREATE TABLE n (s1 CHAR PRIMARY KEY, s2 char);")
+---
+...
+box.sql.execute("INSERT INTO m VALUES ('');")
+---
+...
+box.sql.execute("INSERT INTO n VALUES ('',null);")
+---
+...
+box.sql.execute("UPDATE m SET s1 = 'The Rain In Spain';")
+---
+- error: A multi-statement transaction can not use multiple storage engines
+...
+-- ANALYZE operates with _sql_stat{1,4} tables should work
+box.sql.execute("ANALYZE n;")
+---
+...
+box.sql.execute("DROP TABLE m;")
+---
+...
+box.sql.execute("DROP TABLE n;")
+---
+...
+-- Test SQL Transaction with LUA
+box.sql.execute("PRAGMA sql_default_engine ('memtx');")
+---
+...
+box.sql.execute("CREATE TABLE test (id INT PRIMARY KEY)")
+---
+...
+box.sql.execute("PRAGMA sql_default_engine='vinyl'")
+---
+...
+box.sql.execute("CREATE TABLE test2 (id INT PRIMARY KEY)")
+---
+...
+box.sql.execute("INSERT INTO test2 VALUES (2)")
+---
+...
+test_run:cmd("setopt delimiter ';'")
+---
+- true
+...
+function f()
+ box.sql.execute("START TRANSACTION")
+ box.sql.execute("INSERT INTO test VALUES (1)")
+ box.sql.execute("SELECT * FROM test2")
+ box.sql.execute("COMMIT")
+end;
+---
+...
+f();
+---
+- error: A multi-statement transaction can not use multiple storage engines
+...
+box.sql.execute("ROLLBACK;");
+---
+...
+box.sql.execute("DROP TABLE test;");
+---
+...
+box.sql.execute("DROP TABLE test2;");
+---
+...
+test_run:cmd("setopt delimiter ''");
+---
+- true
+...
diff --git a/test/sql/triggers.test.lua b/test/sql/triggers.test.lua
index e019c00..a9df278 100644
--- a/test/sql/triggers.test.lua
+++ b/test/sql/triggers.test.lua
@@ -95,3 +95,56 @@ box.space._trigger:insert(tuple)
 
 box.sql.execute("DROP VIEW V1;")
 box.sql.execute("DROP TABLE T1;")
+
+--
+-- gh-3531: Assertion with trigger and two storage engines
+--
+-- Case 1: Src 'vinyl' table; Dst 'memtx' table
+box.sql.execute("PRAGMA sql_default_engine ('vinyl');")
+box.sql.execute("CREATE TABLE m (s1 SCALAR PRIMARY KEY);")
+box.sql.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SET s2 = DATETIME('now'); END;")
+box.sql.execute("PRAGMA sql_default_engine('memtx');")
+box.sql.execute("CREATE TABLE n (s1 CHAR PRIMARY KEY, s2 char);")
+box.sql.execute("INSERT INTO m VALUES ('');")
+box.sql.execute("INSERT INTO n VALUES ('',null);")
+box.sql.execute("UPDATE m SET s1 = 'The Rain In Spain';")
+
+-- ANALYZE operates with _sql_stat{1,4} tables should work
+box.sql.execute("ANALYZE m;")
+box.sql.execute("DROP TABLE m;")
+box.sql.execute("DROP TABLE n;")
+
+
+-- Case 2: Src 'memtx' table; Dst 'vinyl' table
+box.sql.execute("PRAGMA sql_default_engine ('memtx');")
+box.sql.execute("CREATE TABLE m (s1 SCALAR PRIMARY KEY);")
+box.sql.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SET s2 = DATETIME('now'); END;")
+box.sql.execute("PRAGMA sql_default_engine('vinyl');")
+box.sql.execute("CREATE TABLE n (s1 CHAR PRIMARY KEY, s2 char);")
+box.sql.execute("INSERT INTO m VALUES ('');")
+box.sql.execute("INSERT INTO n VALUES ('',null);")
+box.sql.execute("UPDATE m SET s1 = 'The Rain In Spain';")
+
+-- ANALYZE operates with _sql_stat{1,4} tables should work
+box.sql.execute("ANALYZE n;")
+box.sql.execute("DROP TABLE m;")
+box.sql.execute("DROP TABLE n;")
+
+-- Test SQL Transaction with LUA
+box.sql.execute("PRAGMA sql_default_engine ('memtx');")
+box.sql.execute("CREATE TABLE test (id INT PRIMARY KEY)")
+box.sql.execute("PRAGMA sql_default_engine='vinyl'")
+box.sql.execute("CREATE TABLE test2 (id INT PRIMARY KEY)")
+box.sql.execute("INSERT INTO test2 VALUES (2)")
+test_run:cmd("setopt delimiter ';'")
+function f()
+ box.sql.execute("START TRANSACTION")
+ box.sql.execute("INSERT INTO test VALUES (1)")
+ box.sql.execute("SELECT * FROM test2")
+ box.sql.execute("COMMIT")
+end;
+f();
+box.sql.execute("ROLLBACK;");
+box.sql.execute("DROP TABLE test;");
+box.sql.execute("DROP TABLE test2;");
+test_run:cmd("setopt delimiter ''");
-- 
2.7.4