parser: add DROP ROLE support (#237)

pingcap · Mar 12, 2019 · 3f6280b · 3f6280b
1 parent 9fca026
commit 3f6280b
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Showing 5 changed files with 49 additions and 10 deletions.
diff --git a/ast/misc.go b/ast/misc.go
@@ -887,13 +887,18 @@ func (n *AlterUserStmt) Accept(v Visitor) (Node, bool) {
 type DropUserStmt struct {
 	stmtNode
 
-	IfExists bool
-	UserList []*auth.UserIdentity
+	IfExists   bool
+	IsDropRole bool
+	UserList   []*auth.UserIdentity
 }
 
 // Restore implements Node interface.
 func (n *DropUserStmt) Restore(ctx *RestoreCtx) error {
-	ctx.WriteKeyWord("DROP USER ")
+	if n.IsDropRole {
+		ctx.WriteKeyWord("DROP ROLE ")
+	} else {
+		ctx.WriteKeyWord("DROP USER ")
+	}
 	if n.IfExists {
 		ctx.WriteKeyWord("IF EXISTS ")
 	}

diff --git a/mysql/const.go b/mysql/const.go
@@ -182,6 +182,10 @@ const (
 	GlobalStatusTable = "GLOBAL_STATUS"
 	// TiDBTable is the table contains tidb info.
 	TiDBTable = "tidb"
+	//  RoleEdgesTable is the table contains role relation info
+	RoleEdgeTable = "role_edges"
+	// DefaultRoleTable is the table contain default active role info
+	DefaultRoleTable = "default_roles"
 )
 
 // PrivilegeType  privilege

diff --git a/parser.go b/parser.go
diff --git a/parser.y b/parser.y
@@ -2429,19 +2429,31 @@ DropViewStmt:
 DropUserStmt:
 	"DROP" "USER" UsernameList
 	{
-		$$ = &ast.DropUserStmt{IfExists: false, UserList: $3.([]*auth.UserIdentity)}
+		$$ = &ast.DropUserStmt{IsDropRole: false, IfExists: false, UserList: $3.([]*auth.UserIdentity)}
 	}
 |	"DROP" "USER" "IF" "EXISTS" UsernameList
 	{
-		$$ = &ast.DropUserStmt{IfExists: true, UserList: $5.([]*auth.UserIdentity)}
+		$$ = &ast.DropUserStmt{IsDropRole: false, IfExists: true, UserList: $5.([]*auth.UserIdentity)}
 	}
 
 DropRoleStmt:
 	"DROP" "ROLE" RolenameList
 	{
+		tmp := make([]*auth.UserIdentity, 0, 10)
+		roleList := $3.([]*auth.RoleIdentity)
+		for _, r := range roleList {
+			tmp = append(tmp, &auth.UserIdentity{Username:r.Username, Hostname: r.Hostname})
+		}
+		$$ = &ast.DropUserStmt{IsDropRole: true, IfExists: false, UserList: tmp}
 	}
 |	"DROP" "ROLE" "IF" "EXISTS" RolenameList
 	{
+		tmp := make([]*auth.UserIdentity, 0, 10)
+		roleList := $5.([]*auth.RoleIdentity)
+		for _, r := range roleList {
+			tmp = append(tmp, &auth.UserIdentity{Username:r.Username, Hostname: r.Hostname})
+		}
+		$$ = &ast.DropUserStmt{IsDropRole: true, IfExists: true, UserList: tmp}
 	}
 
 DropStatsStmt:

diff --git a/parser_test.go b/parser_test.go
@@ -2114,9 +2114,9 @@ func (s *testParserSuite) TestPrivilege(c *C) {
 		{`ALTER USER IF EXISTS USER() IDENTIFIED BY 'new-password'`, true, "ALTER USER IF EXISTS USER() IDENTIFIED BY 'new-password'"},
 		{`DROP USER 'root'@'localhost', 'root1'@'localhost'`, true, "DROP USER `root`@`localhost`, `root1`@`localhost`"},
 		{`DROP USER IF EXISTS 'root'@'localhost'`, true, "DROP USER IF EXISTS `root`@`localhost`"},
-		{`DROP ROLE 'role'@'localhost', 'role1'@'localhost'`, true, ""},
-		{`DROP ROLE 'administrator', 'developer';`, true, ""},
-		{`DROP ROLE IF EXISTS 'role'@'localhost'`, true, ""},
+		{`DROP ROLE 'role'@'localhost', 'role1'@'localhost'`, true, "DROP ROLE `role`@`localhost`, `role1`@`localhost`"},
+		{`DROP ROLE 'administrator', 'developer';`, true, "DROP ROLE `administrator`@`%`, `developer`@`%`"},
+		{`DROP ROLE IF EXISTS 'role'@'localhost'`, true, "DROP ROLE IF EXISTS `role`@`localhost`"},
 
 		// for grant statement
 		{"GRANT ALL ON db1.* TO 'jeffrey'@'localhost';", true, "GRANT ALL ON `db1`.* TO `jeffrey`@`localhost`"},