Addition of the MaxInfo filter and the generic MaxScale resultset

2015-02-18 17:25:13 +00:00
parent 4e5c4c0b6a
commit 8e941f7523
14 changed files with 2163 additions and 2 deletions
--- a/server/modules/include/maxinfo.h
+++ b/server/modules/include/maxinfo.h
@ -0,0 +1,131 @@
+#ifndef _MAXINFO_H
+#define _MAXINFO_H
+/*
+ * This file is distributed as part of the MariaDB Corporation MaxScale.  It is free
+ * software: you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation,
+ * version 2.
+ *
+ * This program is distributed in the hope that it will be useful, 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., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright MariaDB Corporation Ab 2013-2014
+ */
+#include <service.h>
+#include <session.h>
+#include <spinlock.h>
+
+/**
+ * @file maxinfo.h The MaxScale information schema provider
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 16/02/15	Mark Riddoch	Initial implementation
+ *
+ * @endverbatim
+ */
+struct maxinfo_session;
+
+/**
+ * The INFO_INSTANCE structure. There is one instane of the maxinfo "router" for
+ * each service that uses the MaxScale information schema.
+ */
+typedef struct maxinfo_instance {
+	SPINLOCK	lock;		/*< The instance spinlock */
+	SERVICE		*service;	/*< The debug cli service */
+	struct maxinfo_session
+			*sessions;	/*< Linked list of sessions within this instance */
+	struct maxinfo_instance
+			*next;		/*< The next pointer for the list of instances */
+} INFO_INSTANCE;
+
+/**
+ * The INFO_SESSION structure. As INFO_SESSION is created for each user that logs into
+ * the MaxScale information schema.
+ */
+
+typedef struct maxinfo_session {
+	SESSION		*session;	/*< The MaxScale session */
+	DCB		*dcb;		/*< DCB of the client side */
+	GWBUF		*queue;		/*< Queue for building contiguous requests */
+	struct maxinfo_session
+			*next;		/*< The next pointer for the list of sessions */
+} INFO_SESSION;
+
+/**
+ * The operators that can be in the parse tree
+ */
+typedef enum
+{
+	MAXOP_SHOW,
+	MAXOP_SELECT,
+	MAXOP_TABLE,
+	MAXOP_COLUMNS,
+	MAXOP_ALL_COLUMNS,
+	MAXOP_LITERAL,
+	MAXOP_PREDICATE,
+	MAXOP_LIKE,
+	MAXOP_EQUAL
+} MAXINFO_OPERATOR;
+
+/**
+ * The Parse tree nodes for the MaxInfo parser
+ */
+typedef struct maxinfo_tree {
+	MAXINFO_OPERATOR	op;		/*< The operator */
+	char			*value;		/*< The value */
+	struct maxinfo_tree	*left;		/*< The left hand side of the operator */
+	struct maxinfo_tree	*right;		/*< The right hand side of the operator */
+} MAXINFO_TREE;
+
+
+
+#define MYSQL_COMMAND(buf)	(*((uint8_t *)GWBUF_DATA(buf) + 4))
+/**
+ * MySQL protocol OpCodes needed for replication
+ */
+#define	COM_QUIT				0x01
+#define	COM_QUERY				0x03
+#define	COM_STATISTICS				0x09
+#define	COM_PING				0x0e
+
+/**
+ * Token values for the tokeniser used by the parser for maxinfo
+ */
+#define	LT_STRING		1
+#define	LT_SHOW			2
+#define LT_LIKE			3
+#define LT_SELECT		4
+#define LT_EQUAL		5
+#define LT_COMMA		6
+#define LT_FROM			7
+#define LT_STAR			8
+#define LT_VARIABLE		9
+
+
+/**
+ * Possible parse errors
+ */
+typedef enum  {
+	PARSE_NOERROR,
+	PARSE_MALFORMED_SHOW,
+	PARSE_EXPECTED_LIKE,
+	PARSE_SYNTAX_ERROR
+} PARSE_ERROR;
+
+
+extern MAXINFO_TREE	*maxinfo_parse(char *, PARSE_ERROR *);
+extern void		maxinfo_execute(DCB *, MAXINFO_TREE *);
+extern void 		maxinfo_send_error(DCB *, int, char  *);
+extern void 		maxinfo_send_parse_error(DCB *, char *, PARSE_ERROR);
+extern void		maxinfo_send_error(DCB *, int, char  *);
+
+#endif