Added federatedx storage engine

Fixed compiler warnings


client/mysqladmin.cc:
  Fixed compiler warning
extra/yassl/taocrypt/src/twofish.cpp:
  Fixed compiler warning
libmysqld/Makefile.am:
  Use federatedx instead of federated
  (Should actually be removed)
mysql-test/mysql-test-run.pl:
  Fixed warning
mysql-test/valgrind.supp:
  Removed warning found on 64 bit Linux machine
storage/pbxt/src/cache_xt.cc:
  Fixed compile warning
storage/xtradb/include/buf0buf.ic:
  Fixed compiler warning

client/mysqladmin.cc

@@ -1043,7 +1043,7 @@ static int drop_db(MYSQL *mysql, const char *db)
     printf("Do you really want to drop the '%s' database [y/N] ",db);
     fflush(stdout);
     if (fgets(buf,sizeof(buf)-1,stdin) == 0 ||
-        (*buf != 'y') && (*buf != 'Y'))
+        ((*buf != 'y') && (*buf != 'Y')))
     {
       puts("\nOK, aborting database drop!");
       return -1;

extra/yassl/taocrypt/src/twofish.cpp

@@ -55,6 +55,7 @@ void Twofish::Process(byte* out, const byte* in, word32 sz)
             in  += BLOCK_SIZE;
         }
     else if (mode_ == CBC)
+    {
         if (dir_ == ENCRYPTION)
             while (blocks--) {
                 r_[0] ^= *(word32*)in;
@@ -82,6 +83,7 @@ void Twofish::Process(byte* out, const byte* in, word32 sz)
                 out += BLOCK_SIZE;
                 in  += BLOCK_SIZE;
             }
+    }
 }
 
 #endif // DO_TWOFISH_ASM

libmysqld/Makefile.am

@@ -124,7 +124,7 @@ handler.o:	handler.cc
 # found to append fileslists that collected by configure
 # to the sources list
 
-ha_federated.o:ha_federated.cc
+ha_federatedx.o:ha_federatedx.cc
 		$(CXXCOMPILE) $(LM_CFLAGS) -c $<
 
 ha_heap.o:ha_heap.cc

mysql-test/mysql-test-run.pl

@@ -127,7 +127,6 @@ my $path_config_file;           # The generated config file, var/my.cnf
 our $opt_vs_config = $ENV{'MTR_VS_CONFIG'};
 
 my $DEFAULT_SUITES= "binlog,federated,main,maria,rpl,innodb,parts";
-my $opt_suites;
 
 our $opt_usage;
 our $opt_list_options;

mysql-test/suite/federated/disabled.def

@@ -9,4 +9,5 @@
 #  Do not use any TAB characters for whitespace.
 #
 ##############################################################################
-federated_transactions : Bug#29523 Transactions do not work
+federated_server : needs fixup
+

mysql-test/suite/federated/federated.result

@@ -47,9 +47,10 @@ CREATE TABLE federated.t1 (
     )
 ENGINE="FEDERATED" DEFAULT CHARSET=latin1
 CONNECTION='mysql://root@127.0.0.1:SLAVE_PORT/federated/t3';
-SELECT * FROM federated.t1;
-ERROR HY000: The foreign data source you are trying to reference does not exist. Data source error:  error: 1146  'Table 'federated.t3' doesn't exist'
-DROP TABLE federated.t1;
+ERROR HY000: Can't create federated table. Foreign data src error:  database: 'federated'  username: 'root'  hostname: '127.0.0.1'
+DROP TABLE IF EXISTS federated.t1;
+Warnings:
+Note	1051	Unknown table 't1'
 CREATE TABLE federated.t1 (
 `id` int(20) NOT NULL,
 `group` int NOT NULL default 0,
@@ -59,9 +60,10 @@ CREATE TABLE federated.t1 (
     )
 ENGINE="FEDERATED" DEFAULT CHARSET=latin1
 CONNECTION='mysql://user:pass@127.0.0.1:SLAVE_PORT/federated/t1';
-SELECT * FROM federated.t1;
-ERROR HY000: Unable to connect to foreign data source: Access denied for user 'user'@'localhost' (using password: YES)
-DROP TABLE federated.t1;
+ERROR HY000: Can't create federated table. Foreign data src error:  database: 'federated'  username: 'user'  hostname: '127.0.0.1'
+DROP TABLE IF EXISTS federated.t1;
+Warnings:
+Note	1051	Unknown table 't1'
 CREATE TABLE federated.t1 (
 `id` int(20) NOT NULL,
 `group` int NOT NULL default 0,
@@ -1944,15 +1946,7 @@ Bug#18287 create federated table always times out, error 1159 ' '
 
 Test that self-references work
 
-create table federated.t1 (a int primary key);
-create table federated.t2 (a int primary key)
-ENGINE=FEDERATED
-connection='mysql://root@127.0.0.1:SLAVE_PORT/federated/t1';
-insert into federated.t1 (a) values (1);
-select * from federated.t2;
-a
-1
-drop table federated.t1, federated.t2;
+fix LOCK_open before reenabling test for Bug#18287
 CREATE TABLE federated.t1 (a INT PRIMARY KEY) DEFAULT CHARSET=utf8;
 CREATE TABLE federated.t1 (a INT PRIMARY KEY)
 ENGINE=FEDERATED
@@ -1960,13 +1954,11 @@ CONNECTION='mysql://root@127.0.0.1:SLAVE_PORT/federated/t1'
   DEFAULT CHARSET=utf8;
 SELECT transactions FROM information_schema.engines WHERE engine="FEDERATED";
 transactions
-NO
+YES
 INSERT INTO federated.t1 VALUES (1);
 SET autocommit=0;
 INSERT INTO federated.t1 VALUES (2);
 ROLLBACK;
-Warnings:
-Warning	1196	Some non-transactional changed tables couldn't be rolled back
 SET autocommit=1;
 SELECT * FROM federated.t1;
 a
@@ -2157,6 +2149,6 @@ End of 5.1 tests
 SET @@GLOBAL.CONCURRENT_INSERT= @OLD_MASTER_CONCURRENT_INSERT;
 SET @@GLOBAL.CONCURRENT_INSERT= @OLD_SLAVE_CONCURRENT_INSERT;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;

mysql-test/suite/federated/federated.test

@@ -57,6 +57,7 @@ CREATE TABLE federated.t1 (
 
 # test non-existant table
 --replace_result $SLAVE_MYPORT SLAVE_PORT
+--error ER_CANT_CREATE_FEDERATED_TABLE
 eval CREATE TABLE federated.t1 (
     `id` int(20) NOT NULL,
     `group` int NOT NULL default 0,
@@ -66,12 +67,11 @@ eval CREATE TABLE federated.t1 (
     )
   ENGINE="FEDERATED" DEFAULT CHARSET=latin1
   CONNECTION='mysql://root@127.0.0.1:$SLAVE_MYPORT/federated/t3';
---error ER_FOREIGN_DATA_SOURCE_DOESNT_EXIST
-SELECT * FROM federated.t1;
-DROP TABLE federated.t1;
+DROP TABLE IF EXISTS federated.t1;
 
 # test bad user/password 
 --replace_result $SLAVE_MYPORT SLAVE_PORT
+--error ER_CANT_CREATE_FEDERATED_TABLE
 eval CREATE TABLE federated.t1 (
     `id` int(20) NOT NULL,
     `group` int NOT NULL default 0,
@@ -81,9 +81,7 @@ eval CREATE TABLE federated.t1 (
     )
   ENGINE="FEDERATED" DEFAULT CHARSET=latin1
   CONNECTION='mysql://user:pass@127.0.0.1:$SLAVE_MYPORT/federated/t1';
---error ER_CONNECT_TO_FOREIGN_DATA_SOURCE
-SELECT * FROM federated.t1;
-DROP TABLE federated.t1;
+DROP TABLE IF EXISTS federated.t1;
 
 # # correct connection, same named tables
 --replace_result $SLAVE_MYPORT SLAVE_PORT
@@ -1806,6 +1804,8 @@ drop table federated.t1;
 --echo
 --echo Test that self-references work
 --echo
+--echo fix LOCK_open before reenabling test for Bug#18287
+--disable_parsing
 connection slave;
 create table federated.t1 (a int primary key);
 --replace_result $SLAVE_MYPORT SLAVE_PORT
@@ -1815,7 +1815,7 @@ eval create table federated.t2 (a int primary key)
 insert into federated.t1 (a) values (1);
 select * from federated.t2;
 drop table federated.t1, federated.t2;
-
+--enable_parsing
 #
 # BUG#29875 Disable support for transactions
 #

mysql-test/suite/federated/federated_archive.result

@@ -34,6 +34,6 @@ id	name
 DROP TABLE federated.t1;
 DROP TABLE federated.archive_table;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;

mysql-test/suite/federated/federated_bug_13118.result

@@ -25,6 +25,6 @@ foo	bar
 DROP TABLE federated.t1;
 DROP TABLE federated.bug_13118_table;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;

mysql-test/suite/federated/federated_bug_25714.result

@@ -48,6 +48,6 @@ SET @@GLOBAL.CONCURRENT_INSERT= @OLD_MASTER_CONCURRENT_INSERT;
 DROP TABLE federated.t1;
 SET @@GLOBAL.CONCURRENT_INSERT= @OLD_SLAVE_CONCURRENT_INSERT;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;

mysql-test/suite/federated/federated_cleanup.inc

 connection master;
 --disable_warnings
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;
 
 connection slave;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;
 --enable_warnings

mysql-test/suite/federated/federated_innodb.result

@@ -20,6 +20,6 @@ a	b
 drop table federated.t1;
 drop table federated.t1;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;
 DROP TABLE IF EXISTS federated.t1;
-DROP DATABASE federated;
+DROP DATABASE IF EXISTS federated;

mysql-test/suite/federated/federated_server.result

@@ -178,8 +178,8 @@ INSERT INTO db_bogus.t1 VALUES ('2','this is bogus');
 create server 's1' foreign data wrapper 'mysql' options
 (HOST '127.0.0.1',
 DATABASE 'db_legitimate',
-USER 'root',
-PASSWORD '',
+USER 'test_fed',
+PASSWORD 'foo',
 PORT SLAVE_PORT,
 SOCKET '',
 OWNER 'root');

mysql-test/suite/federated/federated_server.test

@@ -3,6 +3,7 @@
 
 # Slow test, don't run during staging part
 -- source include/not_staging.inc
+-- source include/big_test.inc
 -- source federated.inc
 
 connection slave;
@@ -182,13 +183,17 @@ CREATE TABLE db_bogus.t1 (
   ;
 INSERT INTO db_bogus.t1 VALUES ('2','this is bogus');
 
+connection slave;
+create user test_fed@localhost identified by 'foo';
+grant all on db_legitimate.* to test_fed@localhost;
+
 connection master;
 --replace_result $SLAVE_MYPORT SLAVE_PORT
 eval create server 's1' foreign data wrapper 'mysql' options
   (HOST '127.0.0.1',
   DATABASE 'db_legitimate',
-  USER 'root',
-  PASSWORD '',
+  USER 'test_fed',
+  PASSWORD 'foo',
   PORT $SLAVE_MYPORT,
   SOCKET '',
   OWNER 'root');

mysql-test/suite/federated/federated_transactions.result

-stop slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-reset master;
-reset slave;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
-start slave;
-stop slave;
-DROP DATABASE IF EXISTS federated;
 CREATE DATABASE federated;
-DROP DATABASE IF EXISTS federated;
 CREATE DATABASE federated;
 DROP TABLE IF EXISTS federated.t1;
 Warnings:

mysql-test/valgrind.supp

@@ -880,3 +880,17 @@
    fun:nptl_pthread_exit_hack_handler
    fun:start_thread
 }
+
+#
+# Problem with glibc and gethostbyaddr_r
+#
+
+{
+   libc_res_nsend: Conditional jump or move depends on uninitialised value
+   Memcheck:Cond
+   fun: __libc_res_nsend
+   fun: __libc_res_nquery
+   obj: /lib64/libnss_dns-*so)
+   obj: /lib64/libnss_dns-*so)
+   fun: gethostbyaddr_r
+}

storage/federated/README

+The files in this directory are not used by MariaDB
+
+MariaDB uses the new federated storage engine that can be found in the
+federatedx directory.
+
+This directory is only kept around to make it easy to merge code from the
+MySQL source repositories that uses the old and disabled federated code.

storage/federatedx/AUTHORS

+FederatedX
+
+Patrick Galbraith <patg@patg.net> - Federated
+
+Pluggable Storage Engine Skeleton setup
+
+Brian Aker  <brian@mysql.com> | <brian@tangent.org> - Original Design
+Calvin Sun - Windows Support
+Brian Miezejewski - Bug fixes
+Antony T Curtis   - Help in inital development, transactions and various help
+Michael Widenius  - Bug fixes and some simple early optimizations

storage/federatedx/CMakeFiles.txt

+INCLUDE("${PROJECT_SOURCE_DIR}/storage/mysql_storage_engine.cmake")
+SET(FEDERATED_SOURCES  ha_federatedx.cc)
+MYSQL_STORAGE_ENGINE(FEDERATED)

storage/federatedx/ChangeLog

+0.2 -  Thu March 8 00:00:00 EST 2008
+
+  - Fixed bug #30051 "CREATE TABLE does not connect and check existence of remote table"
+    Modified "real_connect" to take a share and create flag to in order to not rely
+    on any settings that are later instantiated and/or set by get_share
+    Also, put logic in the code to not attempt this if a localhost. There's an annoying
+    functionality that if federated tries to connect to itself during creater table, you 
+    get 1159 error (timeout) - only when local. This prevents having this functionality
+    and is probably part of the reason it was removed.
+
+0.1 -  Thu Feb 1 00:00:00 EST 2008
+
+  - This is the FederatedX Storage Engine, 
+    first release.
+  - Added documentation
+  - Added simple test and README file to explain
+    how to run the test
+  - Added FAQ

storage/federatedx/FAQ

+Q. What is the FederatedX pluggable storage engine?
+
+A. It is a fork of the Federated Storage Engine that Brian Aker and I
+(Patrick Galbraith) developed originally . It is a storage engine that
+uses a client connection to a remote MySQL data source as its data
+source instead of a local file on disk.
+
+Q. Why did you fork from Federated?
+
+A. To enhance the storage engine independently of the
+MySQL Server release schedule. Many people have been 
+mentioning their dissatisfaction with the limitations
+of Federated. I think the engine is a great concept and 
+have a sense of obligation to continue to improve it.
+There are some patches already that are in dire need
+of being applied and tested.
+
+Q. What do you plan to do with FederatedX?
+
+A. Many things need addressing:
+
+- Outstanding bugs
+- How do deal with huge result sets
+- Pushdown conditions (being able to pass things like LIMIT
+  to the remote connection to keep from returning huge
+  result sets).
+- Better transactional support
+- Other connection mechanisms (ODBC, JDBC, native drivers
+  of other RDBMSs)
+
+Q. What FederatedX is and is not?
+
+A. FederatedX is not yet a complete "federated" solution in 
+   the sense that other venders have developed (IBM, etc). It
+   is essentially a networked storage engine. It is my hope
+   to make it a real federated solution.
+
+Q. In which MySQL distributions/forks/branches can I find FederateX
+
+A. MariaDB (http://www.mariadb.com)

storage/federatedx/Makefile.am

+# Used to build Makefile.in
+
+MYSQLDATAdir =          $(localstatedir)
+MYSQLSHAREdir =         $(pkgdatadir)
+MYSQLBASEdir=           $(prefix)
+MYSQLLIBdir=            $(pkglibdir)
+pkgplugindir =		$(pkglibdir)/plugin
+INCLUDES =              -I$(top_srcdir)/include -I$(top_builddir)/include \
+			-I$(top_srcdir)/regex \
+			-I$(top_srcdir)/sql \
+                        -I$(srcdir)
+WRAPLIBS=
+
+LDADD =
+
+DEFS =                  @DEFS@
+
+noinst_HEADERS =	ha_federatedx.h federatedx_probes.h
+
+EXTRA_LTLIBRARIES =	ha_federatedx.la
+pkgplugin_LTLIBRARIES =	@plugin_federated_shared_target@
+ha_federatedx_la_LDFLAGS =	-module -rpath $(pkgplugindir)
+ha_federatedx_la_CXXFLAGS=	$(AM_CFLAGS) -DMYSQL_DYNAMIC_PLUGIN
+ha_federatedx_la_CFLAGS =	$(AM_CFLAGS) -DMYSQL_DYNAMIC_PLUGIN
+ha_federatedx_la_SOURCES =	ha_federatedx.cc
+
+
+EXTRA_LIBRARIES =	libfederatedx.a
+noinst_LIBRARIES =	@plugin_federated_static_target@
+libfederatedx_a_CXXFLAGS =	$(AM_CFLAGS)
+libfederatedx_a_CFLAGS =	$(AM_CFLAGS)
+libfederatedx_a_SOURCES=	ha_federatedx.cc federatedx_txn.cc \
+			        federatedx_io.cc federatedx_io_null.cc \
+			        federatedx_io_mysql.cc
+
+EXTRA_DIST =		CMakeLists.txt plug.in ha_federatedx.h \
+			federatedx_probes.d
+
+ha_federatedx_la_SOURCES = ha_federatedx.cc federatedx_txn.cc \
+			   federatedx_io.cc federatedx_io_null.cc \
+			   federatedx_io_mysql.cc $(top_srcdir)/mysys/string.c
+ha_federatedx_la_LIBADD =
+
+#DTRACE =                @DTRACE@
+#DTRACEFLAGS =           @DTRACEFLAGS@
+#DTRACEFILES =           .libs/libfederatedx_engine_la-ha_federatedx.o
+
+# #if HAVE_DTRACE
+# #  libfederatedx_engine_la_LIBADD += federatedx_probes.o
+# #endif
+
+# federatedx_probes.h: federatedx_probes.d
+#	$(DTRACE) $(DTRACEFLAGS) -h -s federatedx_probes.d
+#	mv federatedx_probes.h federatedx_probes.h.bak
+#	sed "s/#include <unistd.h>//g" federatedx_probes.h.bak > federatedx_probes.h
+#	rm federatedx_probes.h.bak
+
+#federatedx_probes.o:
+#	$(DTRACE) $(DTRACEFLAGS) -G -s federatedx_probes.d $(DTRACEFILES)
+
+# End
+
+# Don't update the files from bitkeeper
+%::SCCS/s.%

storage/federatedx/README

+This is the FederatedX Storage Engine, developed as an external storage engine.
+
+NOTE:
+
+The following is only relevant if you use it for MySQL.  MariaDB already comes
+with the latest version of FederatedX.
+
+To install, grab a copy of the mysql source code and run this:
+
+./configure --with-mysql=/path/to/src/mysql-5.x --libdir=/usr/local/lib/mysql/
+
+make install
+
+And then inside of MySQL:
+
+mysql> INSTALL PLUGIN federatedx SONAME 'libfederatedx_engine.so';
+
+mysql> CREATE TABLE `d` (`a` varchar(125), b text, primary key(a)) ENGINE=FEDERATEDX CONNECTION="mysql://root@host/schema/table"
+
+or 
+
+mysql> CREATE TABLE `d` (`a` varchar(125), b text, primary key(a)) ENGINE=FEDERATEDX CONNECTION="server" CHARSET=latin1;
+
+You will probably need to edit the Makefile.am in the src/ tree if you want
+to build on anything other then Linux (and the Makefile assumes that the
+server was not compiled for debug). The reason for the two possible
+configure lines is that libdir is dependent on where MySQL was installed. If
+you run the "INSTALL PLUGIN ..." and you get a file not found, check that
+your configured this directory correctly.
+
+For Solaris you can enable DTrace probes by adding to configure
+--enable-dtrace
+

storage/federatedx/README.windows

+The following files are changed in order to build a new engine on Windows:
+
+- Update win\configure.js with
+case "WITH_FEDERATEDX_STORAGE_ENGINE":
+to make sure it will pass WITH_FEDERATEDX_STORAGE_ENGINE in.
+
+- Update CMakeFiles.txt under mysql root:
+  IF(WITH_FEDERATEDX_STORAGE_ENGINE)
+      ADD_DEFINITIONS(-D WITH_FEDERATEDX_STORAGE_ENGINE)
+  SET (mysql_plugin_defs
+      "${mysql_plugin_defs},builtin_skeleton_plugin")
+  ENDIF(WITH_FEDERATEDX_STORAGE_ENGINE)
+
+  and,
+
+  IF(WITH_FEDERATEDX_STORAGE_ENGINE)
+    ADD_SUBDIRECTORY(storage/skeleton/src)
+  ENDIF(WITH_FEDERATEDX_STORAGE_ENGINE)
+
+  - Update CMakeFiles.txt under sql:
+  IF(WITH_FEDERATEDX_STORAGE_ENGINE)
+    TARGET_LINK_LIBRARIES(mysqld skeleton)
+  ENDIF(WITH_FEDERATEDX_STORAGE_ENGINE)

storage/federatedx/TODO

+Features
+
+* Add Pushdown conditions
+* Add other network driver interfaces
+* Handle large result sets
+* Auto-discovery of tables on foreign data sources
+
+Bugs (http://bugs.mysql.com)
+
+20026 2006-05-23 FEDERATED lacks support for auto_increment_increment and auto_increment_offset   
+20724 2006-06-27 FEDERATED does not honour SET INSERT_ID    
+28269 2007-05-06 Any FEDERATED engine fails to quote reserved words for field names
+25509 2007-01-10 Federated: Failure with non-ASCII characters   
+26697 2007-02-27 Every query to a federated table results in a full scan of MyISAM table.
+21360 2006-07-31 Microsoft Windows (Windows/Linux) mysqldump error on federated tables    
+34189 2008-01-31 Any ALTER TABLE t1 ENGINE=FEDERATED CONNECTION='connectionString' on MyISAM fails    
+31757 2007-10-22 Any Federated tables break replication  Antony Curtis
+33953 2008-01-21 Any mysqld dies on search federated table using nullable index with < or <= operator
+34015 2008-01-23 Linux Problems with float fields using federated tables
+21583 2006-08-11 Linux (Linux) Federated table returns broken strings.    
+33702 2008-01-05 Accessing a federated table with a non existing server returns random error code   
+25512 2007-01-10 Federated: CREATE failures   
+32426 2007-11-16 Any FEDERATED query returns corrupt results for ORDER BY on a TEXT field 
+25510 2007-01-10 Federated: double trigger activation   
+33250 2007-12-14 SELECT * FROM really_big_federated_table eats lots of virtual memory (OOM)   
+14874 2005-11-11 Error 2013: Lost connection to MySQL server with Federated table   
+25508 2007-01-10 Federated: Failure to Remove Partitioning    
+27180 2007-03-15 #1030 - Got error 1 from storage engine with big tables
+33947 2008-01-20 Any Join on Federated tables with Unique index and IS NOT NULL crashes server
+30051 (fixed) CREATE TABLE does not connect and check existence of remote table

storage/federatedx/federatedx_io.cc

+/* 
+Copyright (c) 2007, Antony T Curtis
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+    * Neither the name of FederatedX nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+/*#define MYSQL_SERVER 1*/
+#include "mysql_priv.h"
+#include <mysql/plugin.h>
+
+#include "ha_federatedx.h"
+
+#include "m_string.h"
+
+#ifdef USE_PRAGMA_IMPLEMENTATION
+#pragma implementation                          // gcc: Class implementation
+#endif
+
+typedef federatedx_io *(*instantiate_io_type)(MEM_ROOT *server_root,
+                                              FEDERATEDX_SERVER *server);
+struct io_schemes_st
+{
+  const char *scheme;
+  instantiate_io_type instantiate;
+};
+
+
+static const io_schemes_st federated_io_schemes[] =
+{
+  { "mysql", &instantiate_io_mysql },
+  { "null", instantiate_io_null } /* must be last element */
+};
+
+const uint federated_io_schemes_count= array_elements(federated_io_schemes);
+
+federatedx_io::federatedx_io(FEDERATEDX_SERVER *aserver)
+  : server(aserver), owner_ptr(0), txn_next(0), idle_next(0),
+    active(FALSE), busy(FALSE), readonly(TRUE)
+{
+  DBUG_ENTER("federatedx_io::federatedx_io");
+  DBUG_ASSERT(server);
+
+  safe_mutex_assert_owner(&server->mutex);
+  server->io_count++;
+
+  DBUG_VOID_RETURN;
+}
+
+
+federatedx_io::~federatedx_io()
+{
+  DBUG_ENTER("federatedx_io::~federatedx_io");
+
+  server->io_count--;
+
+  DBUG_VOID_RETURN;
+}
+
+
+bool federatedx_io::handles_scheme(const char *scheme)
+{
+  const io_schemes_st *ptr = federated_io_schemes;
+  const io_schemes_st *end = ptr + array_elements(federated_io_schemes);
+  while (ptr != end && strcasecmp(scheme, ptr->scheme))
+    ++ptr;
+  return ptr != end;
+}
+
+
+federatedx_io *federatedx_io::construct(MEM_ROOT *server_root,
+                                        FEDERATEDX_SERVER *server)
+{
+  const io_schemes_st *ptr = federated_io_schemes;
+  const io_schemes_st *end = ptr + (array_elements(federated_io_schemes) - 1);
+  while (ptr != end && strcasecmp(server->scheme, ptr->scheme))
+    ++ptr;
+  return ptr->instantiate(server_root, server);
+}
+
+

storage/federatedx/federatedx_io_mysql.cc

+/* 
+Copyright (c) 2007, Antony T Curtis
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+    * Neither the name of FederatedX nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+/*#define MYSQL_SERVER 1*/
+#include "mysql_priv.h"
+#include <mysql/plugin.h>
+
+#include "ha_federatedx.h"
+
+#include "m_string.h"
+
+#ifdef USE_PRAGMA_IMPLEMENTATION
+#pragma implementation                          // gcc: Class implementation
+#endif
+
+
+#define SAVEPOINT_REALIZED  1
+#define SAVEPOINT_RESTRICT  2
+#define SAVEPOINT_EMITTED 4
+
+
+typedef struct federatedx_savepoint
+{
+  ulong level;
+  uint  flags;
+} SAVEPT;
+
+
+class federatedx_io_mysql :public federatedx_io
+{
+  MYSQL mysql; /* MySQL connection */
+  DYNAMIC_ARRAY savepoints;
+  bool requested_autocommit;
+  bool actual_autocommit;
+
+  int actual_query(const char *buffer, uint length);
+  bool test_all_restrict() const;
+public:
+  federatedx_io_mysql(FEDERATEDX_SERVER *);
+  ~federatedx_io_mysql();
+
+  int simple_query(const char *fmt, ...);
+  int query(const char *buffer, uint length);
+  virtual FEDERATEDX_IO_RESULT *store_result();
+
+  virtual size_t max_query_size() const;
+
+  virtual my_ulonglong affected_rows() const;
+  virtual my_ulonglong last_insert_id() const;
+
+  virtual int error_code();
+  virtual const char *error_str();
+  
+  void reset();
+  int commit();
+  int rollback();
+  
+  int savepoint_set(ulong sp);
+  ulong savepoint_release(ulong sp);
+  ulong savepoint_rollback(ulong sp);
+  void savepoint_restrict(ulong sp);
+  
+  ulong last_savepoint() const;
+  ulong actual_savepoint() const;
+  bool is_autocommit() const;
+
+  bool table_metadata(ha_statistics *stats, const char *table_name,
+                      uint table_name_length, uint flag);
+
+  /* resultset operations */
+  
+  virtual void free_result(FEDERATEDX_IO_RESULT *io_result);
+  virtual unsigned int get_num_fields(FEDERATEDX_IO_RESULT *io_result);
+  virtual my_ulonglong get_num_rows(FEDERATEDX_IO_RESULT *io_result);
+  virtual FEDERATEDX_IO_ROW *fetch_row(FEDERATEDX_IO_RESULT *io_result);
+  virtual ulong *fetch_lengths(FEDERATEDX_IO_RESULT *io_result);
+  virtual const char *get_column_data(FEDERATEDX_IO_ROW *row,
+                                      unsigned int column);
+  virtual bool is_column_null(const FEDERATEDX_IO_ROW *row,
+                              unsigned int column) const;
+};
+
+
+federatedx_io *instantiate_io_mysql(MEM_ROOT *server_root,
+                                    FEDERATEDX_SERVER *server)
+{
+  return new (server_root) federatedx_io_mysql(server);
+}
+
+
+federatedx_io_mysql::federatedx_io_mysql(FEDERATEDX_SERVER *aserver)
+  : federatedx_io(aserver),
+    requested_autocommit(TRUE), actual_autocommit(TRUE)
+{
+  DBUG_ENTER("federatedx_io_mysql::federatedx_io_mysql");
+
+  bzero(&mysql, sizeof(MYSQL));
+  bzero(&savepoints, sizeof(DYNAMIC_ARRAY));
+
+  my_init_dynamic_array(&savepoints, sizeof(SAVEPT), 16, 16);  
+  
+  DBUG_VOID_RETURN;
+}
+
+
+federatedx_io_mysql::~federatedx_io_mysql()
+{
+  DBUG_ENTER("federatedx_io_mysql::~federatedx_io_mysql");
+
+  mysql_close(&mysql);
+  delete_dynamic(&savepoints);
+
+  DBUG_VOID_RETURN;
+}
+
+
+void federatedx_io_mysql::reset()
+{
+  reset_dynamic(&savepoints);
+  set_active(FALSE);
+  
+  requested_autocommit= TRUE;
+  mysql.reconnect= 1;
+}
+
+
+int federatedx_io_mysql::commit()
+{
+  int error= 0;
+  DBUG_ENTER("federatedx_io_mysql::commit");
+  
+  if (!actual_autocommit && (error= actual_query("COMMIT", 6)))
+    rollback();
+  
+  reset();
+  
+  DBUG_RETURN(error);
+}
+
+int federatedx_io_mysql::rollback()
+{
+  int error= 0;
+  DBUG_ENTER("federatedx_io_mysql::rollback");
+  
+  if (!actual_autocommit)
+    error= actual_query("ROLLBACK", 8);
+  else
+    error= ER_WARNING_NOT_COMPLETE_ROLLBACK;
+
+  reset();
+  
+  DBUG_RETURN(error);
+}
+
+
+ulong federatedx_io_mysql::last_savepoint() const
+{
+  SAVEPT *savept= NULL;
+  DBUG_ENTER("federatedx_io_mysql::last_savepoint");
+
+  if (savepoints.elements)
+    savept= dynamic_element(&savepoints, savepoints.elements - 1, SAVEPT *);
+
+  DBUG_RETURN(savept ? savept->level : 0);
+}
+
+
+ulong federatedx_io_mysql::actual_savepoint() const
+{
+  SAVEPT *savept= NULL;
+  uint index= savepoints.elements;
+  DBUG_ENTER("federatedx_io_mysql::last_savepoint");
+
+  while (index)
+  {
+    savept= dynamic_element(&savepoints, --index, SAVEPT *);
+    if (savept->flags & SAVEPOINT_REALIZED)
+    break;
+  savept= NULL;
+  }
+
+  DBUG_RETURN(savept ? savept->level : 0);
+}
+
+bool federatedx_io_mysql::is_autocommit() const
+{
+  return actual_autocommit;
+}
+
+
+int federatedx_io_mysql::savepoint_set(ulong sp)
+{
+  int error;
+  SAVEPT savept;
+  DBUG_ENTER("federatedx_io_mysql::savepoint_set");
+  DBUG_PRINT("info",("savepoint=%lu", sp));
+  DBUG_ASSERT(sp > last_savepoint());
+
+  savept.level= sp;
+  savept.flags= 0;
+
+  if ((error= insert_dynamic(&savepoints, (uchar*) &savept) ? -1 : 0))
+    goto err;
+
+  set_active(TRUE);
+  mysql.reconnect= 0;
+  requested_autocommit= FALSE;
+
+err:
+  DBUG_RETURN(error);
+}
+
+
+ulong federatedx_io_mysql::savepoint_release(ulong sp)
+{
+  SAVEPT *savept, *last= NULL;
+  DBUG_ENTER("federatedx_io_mysql::savepoint_release");
+  DBUG_PRINT("info",("savepoint=%lu", sp));
+  
+  while (savepoints.elements)
+  {
+    savept= dynamic_element(&savepoints, savepoints.elements - 1, SAVEPT *);
+    if (savept->level < sp)
+      break;
+  if ((savept->flags & (SAVEPOINT_REALIZED | 
+                        SAVEPOINT_RESTRICT)) == SAVEPOINT_REALIZED)
+    last= savept;
+    savepoints.elements--;
+  }
+
+  if (last)
+  {
+    char buffer[STRING_BUFFER_USUAL_SIZE];
+  int length= my_snprintf(buffer, sizeof(buffer),
+              "RELEASE SAVEPOINT save%lu", last->level);
+    actual_query(buffer, length);
+  }
+
+  DBUG_RETURN(last_savepoint()); 
+}
+
+
+ulong federatedx_io_mysql::savepoint_rollback(ulong sp)
+{
+  SAVEPT *savept;
+  uint index;
+  DBUG_ENTER("federatedx_io_mysql::savepoint_release");
+  DBUG_PRINT("info",("savepoint=%lu", sp));
+  
+  while (savepoints.elements)
+  {
+    savept= dynamic_element(&savepoints, savepoints.elements - 1, SAVEPT *);
+  if (savept->level <= sp)
+    break;
+    savepoints.elements--;
+  }
+
+  for (index= savepoints.elements, savept= NULL; index;)
+  {
+    savept= dynamic_element(&savepoints, --index, SAVEPT *);
+    if (savept->flags & SAVEPOINT_REALIZED)
+    break;
+  savept= NULL;
+  }
+  
+  if (savept && !(savept->flags & SAVEPOINT_RESTRICT))
+  {
+    char buffer[STRING_BUFFER_USUAL_SIZE];
+  int length= my_snprintf(buffer, sizeof(buffer),
+              "ROLLBACK TO SAVEPOINT save%lu", savept->level);
+    actual_query(buffer, length);
+  }
+
+  DBUG_RETURN(last_savepoint());
+}
+
+
+void federatedx_io_mysql::savepoint_restrict(ulong sp)
+{
+  SAVEPT *savept;
+  uint index= savepoints.elements;
+  DBUG_ENTER("federatedx_io_mysql::savepoint_restrict");
+  
+  while (index)
+  {
+    savept= dynamic_element(&savepoints, --index, SAVEPT *);
+  if (savept->level > sp)
+    continue;
+  if (savept->level < sp)
+    break;
+  savept->flags|= SAVEPOINT_RESTRICT;
+  break;
+  }
+  
+  DBUG_VOID_RETURN;
+}
+
+
+int federatedx_io_mysql::simple_query(const char *fmt, ...)
+{
+  char buffer[STRING_BUFFER_USUAL_SIZE];
+  int length, error;
+  va_list arg;
+  DBUG_ENTER("federatedx_io_mysql::simple_query");
+
+  va_start(arg, fmt);  
+  length= my_vsnprintf(buffer, sizeof(buffer), fmt, arg);
+  va_end(arg);
+  
+  error= query(buffer, length);
+  
+  DBUG_RETURN(error);
+}
+
+
+bool federatedx_io_mysql::test_all_restrict() const
+{
+  bool result= FALSE;
+  SAVEPT *savept;
+  uint index= savepoints.elements;
+  DBUG_ENTER("federatedx_io_mysql::test_all_restrict");
+  
+  while (index)
+  {
+    savept= dynamic_element(&savepoints, --index, SAVEPT *);
+  if ((savept->flags & (SAVEPOINT_REALIZED | 
+                        SAVEPOINT_RESTRICT)) == SAVEPOINT_REALIZED ||
+    (savept->flags & SAVEPOINT_EMITTED))
+      DBUG_RETURN(FALSE);
+    if (savept->flags & SAVEPOINT_RESTRICT)
+    result= TRUE;
+  }
+  
+  DBUG_RETURN(result); 
+}
+
+
+int federatedx_io_mysql::query(const char *buffer, uint length)
+{
+  int error;
+  bool wants_autocommit= requested_autocommit | is_readonly();
+  DBUG_ENTER("federatedx_io_mysql::query");
+
+  if (!wants_autocommit && test_all_restrict())
+    wants_autocommit= TRUE;
+
+  if (wants_autocommit != actual_autocommit)
+  {
+    if ((error= actual_query(wants_autocommit ? "SET AUTOCOMMIT=1"
+                                            : "SET AUTOCOMMIT=0", 16)))
+    DBUG_RETURN(error);                         
+    mysql.reconnect= wants_autocommit ? 1 : 0;
+    actual_autocommit= wants_autocommit;
+  }
+  
+  if (!actual_autocommit && last_savepoint() != actual_savepoint())
+  {
+    SAVEPT *savept= dynamic_element(&savepoints, savepoints.elements - 1, 
+                                SAVEPT *);
+    if (!(savept->flags & SAVEPOINT_RESTRICT))
+  {
+      char buf[STRING_BUFFER_USUAL_SIZE];
+    int len= my_snprintf(buf, sizeof(buf),
+                  "SAVEPOINT save%lu", savept->level);
+      if ((error= actual_query(buf, len)))
+    DBUG_RETURN(error);                         
+    set_active(TRUE);
+    savept->flags|= SAVEPOINT_EMITTED;
+    }
+    savept->flags|= SAVEPOINT_REALIZED;
+  }
+
+  if (!(error= actual_query(buffer, length)))
+    set_active(is_active() || !actual_autocommit);
+
+  DBUG_RETURN(error);
+}
+
+
+int federatedx_io_mysql::actual_query(const char *buffer, uint length)
+{
+  int error;
+  DBUG_ENTER("federatedx_io_mysql::actual_query");
+
+  if (!mysql.master)
+  {
+    if (!(mysql_init(&mysql)))
+    DBUG_RETURN(-1);
+  
+    /*
+	BUG# 17044 Federated Storage Engine is not UTF8 clean
+	Add set names to whatever charset the table is at open
+	of table
+    */
+    /* this sets the csname like 'set names utf8' */
+    mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, get_charsetname());
+
+    if (!mysql_real_connect(&mysql,
+                            get_hostname(),
+                            get_username(),
+                            get_password(),
+                            get_database(),
+                            get_port(),
+                            get_socket(), 0))
+      DBUG_RETURN(ER_CONNECT_TO_FOREIGN_DATA_SOURCE);
+    mysql.reconnect= 1;
+  }
+
+  error= mysql_real_query(&mysql, buffer, length);
+  
+  DBUG_RETURN(error);
+}
+
+size_t federatedx_io_mysql::max_query_size() const
+{
+  return mysql.net.max_packet_size;
+}
+
+
+my_ulonglong federatedx_io_mysql::affected_rows() const
+{
+  return mysql.affected_rows;
+}
+
+
+my_ulonglong federatedx_io_mysql::last_insert_id() const
+{
+  return mysql.last_used_con->insert_id;
+}
+
+
+int federatedx_io_mysql::error_code()
+{
+  return mysql_errno(&mysql);
+}
+
+
+const char *federatedx_io_mysql::error_str()
+{
+  return mysql_error(&mysql);
+}
+
+
+FEDERATEDX_IO_RESULT *federatedx_io_mysql::store_result()
+{
+  FEDERATEDX_IO_RESULT *result;
+  DBUG_ENTER("federatedx_io_mysql::store_result");
+  
+  result= (FEDERATEDX_IO_RESULT *) mysql_store_result(&mysql);
+  
+  DBUG_RETURN(result);
+}
+
+
+void federatedx_io_mysql::free_result(FEDERATEDX_IO_RESULT *io_result)
+{
+  mysql_free_result((MYSQL_RES *) io_result);
+}
+
+
+unsigned int federatedx_io_mysql::get_num_fields(FEDERATEDX_IO_RESULT *io_result)
+{
+  return mysql_num_fields((MYSQL_RES *) io_result);
+}
+
+
+my_ulonglong federatedx_io_mysql::get_num_rows(FEDERATEDX_IO_RESULT *io_result)
+{
+  return mysql_num_rows((MYSQL_RES *) io_result);
+}
+
+
+FEDERATEDX_IO_ROW *federatedx_io_mysql::fetch_row(FEDERATEDX_IO_RESULT *io_result)
+{
+  return (FEDERATEDX_IO_ROW *) mysql_fetch_row((MYSQL_RES *) io_result);
+}
+
+
+ulong *federatedx_io_mysql::fetch_lengths(FEDERATEDX_IO_RESULT *io_result)
+{
+  return mysql_fetch_lengths((MYSQL_RES *) io_result);
+}
+
+
+const char *federatedx_io_mysql::get_column_data(FEDERATEDX_IO_ROW *row,
+                                                 unsigned int column)
+{
+  return ((MYSQL_ROW)row)[column];
+}
+
+
+bool federatedx_io_mysql::is_column_null(const FEDERATEDX_IO_ROW *row,
+                                         unsigned int column) const
+{
+  return !((MYSQL_ROW)row)[column];
+}
+
+bool federatedx_io_mysql::table_metadata(ha_statistics *stats,
+                                         const char *table_name,
+                                         uint table_name_length, uint flag)
+{
+  char status_buf[FEDERATEDX_QUERY_BUFFER_SIZE];
+  FEDERATEDX_IO_RESULT *result= 0;
+  FEDERATEDX_IO_ROW *row;
+  String status_query_string(status_buf, sizeof(status_buf), &my_charset_bin);
+  int error;
+
+  status_query_string.length(0);
+  status_query_string.append(STRING_WITH_LEN("SHOW TABLE STATUS LIKE "));
+  append_ident(&status_query_string, table_name,
+               table_name_length, value_quote_char);
+
+  if (query(status_query_string.ptr(), status_query_string.length()))
+    goto error;
+
+  status_query_string.length(0);
+
+  result= store_result();
+
+  /*
+    We're going to use fields num. 4, 12 and 13 of the resultset,
+    so make sure we have these fields.
+  */
+  if (!result || (get_num_fields(result) < 14))
+    goto error;
+
+  if (!get_num_rows(result))
+    goto error;
+
+  if (!(row= fetch_row(result)))
+    goto error;
+
+  /*
+    deleted is set in ha_federatedx::info
+  */
+  /*
+    need to figure out what this means as far as federatedx is concerned,
+    since we don't have a "file"
+
+    data_file_length = ?
+    index_file_length = ?
+    delete_length = ?
+  */
+  if (!is_column_null(row, 4))
+    stats->records= (ha_rows) my_strtoll10(get_column_data(row, 4),
+	                                   (char**) 0, &error);
+  if (!is_column_null(row, 5))
+    stats->mean_rec_length= (ulong) my_strtoll10(get_column_data(row, 5),
+	                                         (char**) 0, &error);
+
+  stats->data_file_length= stats->records * stats->mean_rec_length;
+
+  if (!is_column_null(row, 12))
+    stats->update_time= (time_t) my_strtoll10(get_column_data(row, 12),
+	                                      (char**) 0, &error);
+  if (!is_column_null(row, 13))
+    stats->check_time= (time_t) my_strtoll10(get_column_data(row, 13),
+	                                     (char**) 0, &error);
+
+  free_result(result);
+  return 0;
+
+error:
+  free_result(result);
+  return 1;
+}

storage/federatedx/federatedx_io_null.cc

+/* 
+Copyright (c) 2007, Antony T Curtis
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+    * Neither the name of FederatedX nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+/*#define MYSQL_SERVER 1*/
+#include "mysql_priv.h"
+#include <mysql/plugin.h>
+
+#include "ha_federatedx.h"
+
+#include "m_string.h"
+
+#ifdef USE_PRAGMA_IMPLEMENTATION
+#pragma implementation                          // gcc: Class implementation
+#endif
+
+
+#define SAVEPOINT_REALIZED  1
+#define SAVEPOINT_RESTRICT  2
+#define SAVEPOINT_EMITTED 4
+
+
+typedef struct federatedx_savepoint
+{
+  ulong level;
+  uint  flags;
+} SAVEPT;
+
+
+class federatedx_io_null :public federatedx_io
+{
+public:
+  federatedx_io_null(FEDERATEDX_SERVER *);
+  ~federatedx_io_null();
+
+  int query(const char *buffer, uint length);
+  virtual FEDERATEDX_IO_RESULT *store_result();
+
+  virtual size_t max_query_size() const;
+
+  virtual my_ulonglong affected_rows() const;
+  virtual my_ulonglong last_insert_id() const;
+
+  virtual int error_code();
+  virtual const char *error_str();
+  
+  void reset();
+  int commit();
+  int rollback();
+  
+  int savepoint_set(ulong sp);
+  ulong savepoint_release(ulong sp);
+  ulong savepoint_rollback(ulong sp);
+  void savepoint_restrict(ulong sp);
+  
+  ulong last_savepoint() const;
+  ulong actual_savepoint() const;
+  bool is_autocommit() const;
+
+  bool table_metadata(ha_statistics *stats, const char *table_name,
+                      uint table_name_length, uint flag);
+  
+  /* resultset operations */
+  
+  virtual void free_result(FEDERATEDX_IO_RESULT *io_result);
+  virtual unsigned int get_num_fields(FEDERATEDX_IO_RESULT *io_result);
+  virtual my_ulonglong get_num_rows(FEDERATEDX_IO_RESULT *io_result);
+  virtual FEDERATEDX_IO_ROW *fetch_row(FEDERATEDX_IO_RESULT *io_result);
+  virtual ulong *fetch_lengths(FEDERATEDX_IO_RESULT *io_result);
+  virtual const char *get_column_data(FEDERATEDX_IO_ROW *row,
+                                      unsigned int column);
+  virtual bool is_column_null(const FEDERATEDX_IO_ROW *row,
+                              unsigned int column) const;
+};
+
+
+federatedx_io *instantiate_io_null(MEM_ROOT *server_root,
+                                   FEDERATEDX_SERVER *server)
+{
+  return new (server_root) federatedx_io_null(server);
+}
+
+
+federatedx_io_null::federatedx_io_null(FEDERATEDX_SERVER *aserver)
+  : federatedx_io(aserver)
+{
+}
+
+
+federatedx_io_null::~federatedx_io_null()
+{
+}
+
+
+void federatedx_io_null::reset()
+{
+}
+
+
+int federatedx_io_null::commit()
+{
+  return 0;
+}
+
+int federatedx_io_null::rollback()
+{
+  return 0;
+}
+
+
+ulong federatedx_io_null::last_savepoint() const
+{
+  return 0;
+}
+
+
+ulong federatedx_io_null::actual_savepoint() const
+{
+  return 0;
+}
+
+bool federatedx_io_null::is_autocommit() const
+{
+  return 0;
+}
+
+
+int federatedx_io_null::savepoint_set(ulong sp)
+{
+  return 0;
+}
+
+
+ulong federatedx_io_null::savepoint_release(ulong sp)
+{
+  return 0;
+}
+
+
+ulong federatedx_io_null::savepoint_rollback(ulong sp)
+{
+  return 0;
+}
+
+
+void federatedx_io_null::savepoint_restrict(ulong sp)
+{
+}
+
+
+int federatedx_io_null::query(const char *buffer, uint length)
+{
+  return 0;
+}
+
+
+size_t federatedx_io_null::max_query_size() const
+{
+  return INT_MAX;
+}
+
+
+my_ulonglong federatedx_io_null::affected_rows() const
+{
+  return 0;
+}
+
+
+my_ulonglong federatedx_io_null::last_insert_id() const
+{
+  return 0;
+}
+
+
+int federatedx_io_null::error_code()
+{
+  return 0;
+}
+
+
+const char *federatedx_io_null::error_str()
+{
+  return "";
+}
+
+
+FEDERATEDX_IO_RESULT *federatedx_io_null::store_result()
+{
+  FEDERATEDX_IO_RESULT *result;
+  DBUG_ENTER("federatedx_io_null::store_result");
+  
+  result= NULL;
+  
+  DBUG_RETURN(result);
+}
+
+
+void federatedx_io_null::free_result(FEDERATEDX_IO_RESULT *)
+{
+}
+
+
+unsigned int federatedx_io_null::get_num_fields(FEDERATEDX_IO_RESULT *)
+{
+  return 0;
+}
+
+
+my_ulonglong federatedx_io_null::get_num_rows(FEDERATEDX_IO_RESULT *)
+{
+  return 0;
+}
+
+
+FEDERATEDX_IO_ROW *federatedx_io_null::fetch_row(FEDERATEDX_IO_RESULT *)
+{
+  return NULL;
+}
+
+
+ulong *federatedx_io_null::fetch_lengths(FEDERATEDX_IO_RESULT *)
+{
+  return NULL;
+}
+
+
+const char *federatedx_io_null::get_column_data(FEDERATEDX_IO_ROW *,
+                                                 unsigned int)
+{
+  return "";
+}
+
+
+bool federatedx_io_null::is_column_null(const FEDERATEDX_IO_ROW *,
+                                         unsigned int) const
+{
+  return true;
+}
+
+bool federatedx_io_null::table_metadata(ha_statistics *stats,
+                                        const char *table_name,
+                                        uint table_name_length, uint flag)
+{
+  stats->records= (ha_rows) 0;
+  stats->mean_rec_length= (ulong) 0;
+  stats->data_file_length= 0;
+
+  stats->update_time= (time_t) 0;
+  stats->check_time= (time_t) 0;
+
+  return 0;
+}

storage/federatedx/federatedx_probes.h

+/*
+ * Generated by dtrace(1M).
+ */
+
+#ifndef	_FEDERATED_PROBES_H
+#define	_FEDERATED_PROBES_H
+
+
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#if _DTRACE_VERSION
+
+#define	FEDERATED_CLOSE() \
+	__dtrace_federated___close()
+#define	FEDERATED_CLOSE_ENABLED() \
+	__dtraceenabled_federated___close()
+#define	FEDERATED_OPEN() \
+	__dtrace_federated___open()
+#define	FEDERATED_OPEN_ENABLED() \
+	__dtraceenabled_federated___open()
+
+
+extern void __dtrace_federated___close(void);
+extern int __dtraceenabled_federated___close(void);
+extern void __dtrace_federated___open(void);
+extern int __dtraceenabled_federated___open(void);
+
+#else
+
+#define	FEDERATED_CLOSE()
+#define	FEDERATED_CLOSE_ENABLED() (0)
+#define	FEDERATED_OPEN()
+#define	FEDERATED_OPEN_ENABLED() (0)
+
+#endif
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _FEDERATED_PROBES_H */

storage/federatedx/federatedx_txn.cc

+/* 
+Copyright (c) 2007, Antony T Curtis
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+    * Neither the name of FederatedX nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+/*#define MYSQL_SERVER 1*/
+#include "mysql_priv.h"
+#include <mysql/plugin.h>
+
+#include "ha_federatedx.h"
+
+#include "m_string.h"
+
+#ifdef USE_PRAGMA_IMPLEMENTATION
+#pragma implementation                          // gcc: Class implementation
+#endif
+
+
+federatedx_txn::federatedx_txn()
+  : txn_list(0), savepoint_level(0), savepoint_stmt(0), savepoint_next(0)
+{
+  DBUG_ENTER("federatedx_txn::federatedx_txn");
+  DBUG_VOID_RETURN;
+}
+
+federatedx_txn::~federatedx_txn()
+{
+  DBUG_ENTER("federatedx_txn::~federatedx_txn");
+  DBUG_ASSERT(!txn_list);
+  DBUG_VOID_RETURN;
+}
+
+
+void federatedx_txn::close(FEDERATEDX_SERVER *server)
+{
+  uint count= 0;
+  federatedx_io *io, **iop;
+  DBUG_ENTER("federatedx_txn::close");
+  
+  DBUG_ASSERT(!server->use_count);
+  DBUG_PRINT("info",("use count: %u  connections: %u", 
+                     server->use_count, server->io_count));
+
+  for (iop= &txn_list; (io= *iop);)
+  {
+    if (io->server != server)
+      iop= &io->txn_next;
+    else
+    {
+      *iop= io->txn_next;
+      io->txn_next= NULL;
+      io->busy= FALSE;
+
+      io->idle_next= server->idle_list;
+      server->idle_list= io;
+    }
+  }
+
+  while ((io= server->idle_list))
+  {
+    server->idle_list= io->idle_next;
+    delete io;
+    count++;
+  }
+  
+  DBUG_PRINT("info",("closed %u connections,  txn_list: %s", count,
+                     txn_list ? "active":  "empty"));
+  DBUG_VOID_RETURN;
+}
+
+
+int federatedx_txn::acquire(FEDERATEDX_SHARE *share, bool readonly,
+                            federatedx_io **ioptr)
+{
+  federatedx_io *io;
+  FEDERATEDX_SERVER *server= share->s;
+  DBUG_ENTER("federatedx_txn::acquire");
+  DBUG_ASSERT(ioptr && server);
+
+  if (!(io= *ioptr))
+  {
+    /* check to see if we have an available IO connection */
+    for (io= txn_list; io; io= io->txn_next)
+      if (io->server == server)
+	break;
+
+    if (!io)
+    {
+      /* check to see if there are any unowned IO connections */
+      pthread_mutex_lock(&server->mutex);
+      if ((io= server->idle_list))
+      {
+	server->idle_list= io->idle_next;
+	io->idle_next= NULL;
+      }
+      else
+	io= federatedx_io::construct(&server->mem_root, server);
+
+      io->txn_next= txn_list;
+      txn_list= io;
+
+      pthread_mutex_unlock(&server->mutex);
+    }
+
+    if (io->busy)
+      *io->owner_ptr= NULL;
+    
+    io->busy= TRUE;
+    io->owner_ptr= ioptr;
+  }
+  
+  DBUG_ASSERT(io->busy && io->server == server);
+  
+  io->readonly&= readonly;
+
+  DBUG_RETURN((*ioptr= io) ? 0 : -1);
+}
+
+
+void federatedx_txn::release(federatedx_io **ioptr)
+{
+  federatedx_io *io;
+  DBUG_ENTER("federatedx_txn::release");
+  DBUG_ASSERT(ioptr);
+
+  if ((io= *ioptr))
+  {
+    /* mark as available for reuse in this transaction */
+    io->busy= FALSE;
+    *ioptr= NULL;
+  
+    DBUG_PRINT("info", ("active: %d autocommit: %d", 
+                	io->active, io->is_autocommit()));
+
+    if (io->is_autocommit())
+      io->active= FALSE;
+  }
+
+  release_scan();
+
+  DBUG_VOID_RETURN;
+}
+
+
+void federatedx_txn::release_scan()
+{
+  uint count= 0, returned= 0;
+  federatedx_io *io, **pio;
+  DBUG_ENTER("federatedx_txn::release_scan");
+
+  /* return any inactive and idle connections to the server */  
+  for (pio= &txn_list; (io= *pio); count++)
+  {
+    if (io->active || io->busy)
+      pio= &io->txn_next;
+    else
+    {
+      FEDERATEDX_SERVER *server= io->server;
+
+      /* unlink from list of connections bound to the transaction */
+      *pio= io->txn_next; 
+      io->txn_next= NULL;
+
+      /* reset some values */
+      io->readonly= TRUE;
+
+      pthread_mutex_lock(&server->mutex);
+      io->idle_next= server->idle_list;
+      server->idle_list= io;
+      pthread_mutex_unlock(&server->mutex);
+      returned++;
+    }
+  }
+  DBUG_PRINT("info",("returned %u of %u connections(s)", returned, count));
+
+  DBUG_VOID_RETURN;
+}
+
+
+bool federatedx_txn::txn_begin()
+{
+  ulong level= 0;
+  DBUG_ENTER("federatedx_txn::txn_begin");
+
+  if (savepoint_next == 0)
+  {
+    savepoint_next++;
+    savepoint_level= savepoint_stmt= 0;
+    sp_acquire(&level);
+  }
+
+  DBUG_RETURN(level == 1);
+}
+
+
+int federatedx_txn::txn_commit()
+{
+  int error= 0;
+  federatedx_io *io;
+  DBUG_ENTER("federatedx_txn::txn_commit");
+
+  if (savepoint_next)
+  {
+    DBUG_ASSERT(savepoint_stmt != 1);
+
+    for (io= txn_list; io; io= io->txn_next)
+    {
+      int rc= 0;
+
+      if (io->active)
+	rc= io->commit();
+      else
+	io->rollback();
+
+      if (io->active && rc)
+	error= -1;
+
+      io->reset();
+    }
+
+    release_scan();
+
+    savepoint_next= savepoint_stmt= savepoint_level= 0;
+  }
+    
+  DBUG_RETURN(error);
+}
+
+
+int federatedx_txn::txn_rollback()
+{
+  int error= 0;
+  federatedx_io *io;
+  DBUG_ENTER("federatedx_txn::txn_commit");
+
+  if (savepoint_next)
+  {
+    DBUG_ASSERT(savepoint_stmt != 1);
+
+    for (io= txn_list; io; io= io->txn_next)
+    {
+      int rc= io->rollback();
+
+      if (io->active && rc)
+	error= -1;
+
+      io->reset();
+    }
+
+    release_scan();
+
+    savepoint_next= savepoint_stmt= savepoint_level= 0;
+  }
+    
+  DBUG_RETURN(error);
+}
+
+
+bool federatedx_txn::sp_acquire(ulong *sp)
+{
+  bool rc= FALSE;
+  federatedx_io *io;
+  DBUG_ENTER("federatedx_txn::sp_acquire");
+  DBUG_ASSERT(sp && savepoint_next);
+  
+  *sp= savepoint_level= savepoint_next++;
+    
+  for (io= txn_list; io; io= io->txn_next)
+  {
+    if (io->readonly)
+      continue;
+
+    io->savepoint_set(savepoint_level);
+    rc= TRUE;
+  }
+
+  DBUG_RETURN(rc);
+}
+
+
+int federatedx_txn::sp_rollback(ulong *sp)
+{
+  ulong level, new_level= savepoint_level;
+  federatedx_io *io;
+  DBUG_ENTER("federatedx_txn::sp_rollback");
+  DBUG_ASSERT(sp && savepoint_next && *sp && *sp <= savepoint_level);
+  
+  for (io= txn_list; io; io= io->txn_next)
+  {
+    if (io->readonly)
+      continue;
+
+    if ((level= io->savepoint_rollback(*sp)) < new_level)
+      new_level= level;
+  } 
+  
+  savepoint_level= new_level;
+  
+  DBUG_RETURN(0);
+}
+
+
+int federatedx_txn::sp_release(ulong *sp)
+{
+  ulong level, new_level= savepoint_level;
+  federatedx_io *io;
+  DBUG_ENTER("federatedx_txn::sp_release");
+  DBUG_ASSERT(sp && savepoint_next && *sp && *sp <= savepoint_level);
+  
+  for (io= txn_list; io; io= io->txn_next)
+  {
+    if (io->readonly)
+      continue;
+
+    if ((level= io->savepoint_release(*sp)) < new_level)
+      new_level= level;
+  }
+
+  savepoint_level= new_level;
+  *sp= 0;
+
+  DBUG_RETURN(0);
+}
+
+
+bool federatedx_txn::stmt_begin()
+{
+  bool result= FALSE;
+  DBUG_ENTER("federatedx_txn::stmt_begin");
+
+  if (!savepoint_stmt)
+  {
+    if (!savepoint_next)
+    {
+      savepoint_next++;
+      savepoint_level= savepoint_stmt= 0;
+    }
+    result= sp_acquire(&savepoint_stmt);
+  }
+
+  DBUG_RETURN(result);
+}
+
+
+int federatedx_txn::stmt_commit()
+{ 
+  int result= 0;
+  DBUG_ENTER("federatedx_txn::stmt_commit");
+  
+  if (savepoint_stmt == 1)
+  {
+    savepoint_stmt= 0;
+    result= txn_commit();
+  }
+  else  
+  if (savepoint_stmt)
+    result= sp_release(&savepoint_stmt);
+
+  DBUG_RETURN(result);
+}
+
+
+int federatedx_txn::stmt_rollback()
+{
+  int result= 0;
+  DBUG_ENTER("federated:txn::stmt_rollback");
+
+  if (savepoint_stmt == 1)
+  {
+    savepoint_stmt= 0;
+    result= txn_rollback();
+  }
+  else
+  if (savepoint_stmt)
+  {
+    result= sp_rollback(&savepoint_stmt);
+    sp_release(&savepoint_stmt);
+  }
+  
+  DBUG_RETURN(result);
+}
+
+
+void federatedx_txn::stmt_autocommit()
+{
+  federatedx_io *io;
+  DBUG_ENTER("federatedx_txn::stmt_autocommit");
+
+  for (io= txn_list; savepoint_stmt && io; io= io->txn_next)
+  {
+    if (io->readonly)
+      continue;
+
+    io->savepoint_restrict(savepoint_stmt);
+  }
+
+  DBUG_VOID_RETURN;  
+}
+
+

storage/federatedx/ha_federatedx.h

+/* 
+Copyright (c) 2008, Patrick Galbraith 
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+
+    * Neither the name of Patrick Galbraith nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+class federatedx_io;
+
+/*
+  FEDERATEDX_SERVER will eventually be a structure that will be shared among
+  all FEDERATEDX_SHARE instances so that the federated server can minimise
+  the number of open connections. This will eventually lead to the support
+  of reliable XA federated tables.
+*/
+typedef struct st_fedrated_server {
+  MEM_ROOT mem_root;
+  uint use_count, io_count;
+  
+  uchar *key;
+  uint key_length;
+
+  const char *scheme;
+  const char *hostname;
+  const char *username;
+  const char *password;
+  const char *database;
+  const char *socket;
+  ushort port;
+
+  const char *csname;
+
+  pthread_mutex_t mutex;
+  federatedx_io *idle_list;
+} FEDERATEDX_SERVER;
+
+/*
+  Please read ha_exmple.cc before reading this file.
+  Please keep in mind that the federatedx storage engine implements all methods
+  that are required to be implemented. handler.h has a full list of methods
+  that you can implement.
+*/
+
+#ifdef USE_PRAGMA_INTERFACE
+#pragma interface			/* gcc class implementation */
+#endif
+
+#include <mysql.h>
+
+/* 
+  handler::print_error has a case statement for error numbers.
+  This value is (10000) is far out of range and will envoke the 
+  default: case.  
+  (Current error range is 120-159 from include/my_base.h)
+*/
+#define HA_FEDERATEDX_ERROR_WITH_REMOTE_SYSTEM 10000
+
+#define FEDERATEDX_QUERY_BUFFER_SIZE STRING_BUFFER_USUAL_SIZE * 5
+#define FEDERATEDX_RECORDS_IN_RANGE 2
+#define FEDERATEDX_MAX_KEY_LENGTH 3500 // Same as innodb
+
+/*
+  FEDERATEDX_SHARE is a structure that will be shared amoung all open handlers
+  The example implements the minimum of what you will probably need.
+*/
+typedef struct st_federatedx_share {
+  MEM_ROOT mem_root;
+
+  bool parsed;
+  /* this key is unique db/tablename */
+  const char *share_key;
+  /*
+    the primary select query to be used in rnd_init
+  */
+  char *select_query;
+  /*
+    remote host info, parse_url supplies
+  */
+  char *server_name;
+  char *connection_string;
+  char *scheme;
+  char *hostname;
+  char *username;
+  char *password;
+  char *database;
+  char *table_name;
+  char *table;
+  char *socket;
+  char *sport;
+  int share_key_length;
+  ushort port;
+
+  uint table_name_length, server_name_length, connect_string_length;
+  uint use_count;
+  THR_LOCK lock;
+  FEDERATEDX_SERVER *s;
+} FEDERATEDX_SHARE;
+
+
+typedef struct st_federatedx_result FEDERATEDX_IO_RESULT;
+typedef struct st_federatedx_row FEDERATEDX_IO_ROW;
+typedef ptrdiff_t FEDERATEDX_IO_OFFSET;
+
+class federatedx_io
+{
+  friend class federatedx_txn;
+  FEDERATEDX_SERVER * const server;
+  federatedx_io **owner_ptr;
+  federatedx_io *txn_next;
+  federatedx_io *idle_next;
+  bool active;  /* currently participating in a transaction */
+  bool busy;    /* in use by a ha_federated instance */
+  bool readonly;/* indicates that no updates have occurred */
+
+protected:
+  void set_active(bool new_active)
+  { active= new_active; }
+public:
+  federatedx_io(FEDERATEDX_SERVER *);
+  virtual ~federatedx_io();
+
+  bool is_readonly() const { return readonly; }
+  bool is_active() const { return active; }
+
+  const char * get_charsetname() const
+  { return server->csname ? server->csname : "latin1"; }
+
+  const char * get_hostname() const { return server->hostname; }
+  const char * get_username() const { return server->username; }
+  const char * get_password() const { return server->password; }
+  const char * get_database() const { return server->database; }
+  ushort       get_port() const     { return server->port; }
+  const char * get_socket() const   { return server->socket; }
+  
+  static bool handles_scheme(const char *scheme);
+  static federatedx_io *construct(MEM_ROOT *server_root,
+                                  FEDERATEDX_SERVER *server);
+
+  static void *operator new(size_t size, MEM_ROOT *mem_root) throw ()
+  { return alloc_root(mem_root, size); }
+  static void operator delete(void *ptr, size_t size)
+  { TRASH(ptr, size); }
+    
+  virtual int query(const char *buffer, uint length)=0;
+  virtual FEDERATEDX_IO_RESULT *store_result()=0;
+
+  virtual size_t max_query_size() const=0;
+
+  virtual my_ulonglong affected_rows() const=0;
+  virtual my_ulonglong last_insert_id() const=0;
+
+  virtual int error_code()=0;
+  virtual const char *error_str()=0;
+  
+  virtual void reset()=0;
+  virtual int commit()=0;
+  virtual int rollback()=0;
+  
+  virtual int savepoint_set(ulong sp)=0;
+  virtual ulong savepoint_release(ulong sp)=0;
+  virtual ulong savepoint_rollback(ulong sp)=0;
+  virtual void savepoint_restrict(ulong sp)=0;
+  
+  virtual ulong last_savepoint() const=0;
+  virtual ulong actual_savepoint() const=0;
+  virtual bool is_autocommit() const=0;
+
+  virtual bool table_metadata(ha_statistics *stats, const char *table_name,
+                              uint table_name_length, uint flag) = 0;
+  
+  /* resultset operations */
+  
+  virtual void free_result(FEDERATEDX_IO_RESULT *io_result)=0;
+  virtual unsigned int get_num_fields(FEDERATEDX_IO_RESULT *io_result)=0;
+  virtual my_ulonglong get_num_rows(FEDERATEDX_IO_RESULT *io_result)=0;
+  virtual FEDERATEDX_IO_ROW *fetch_row(FEDERATEDX_IO_RESULT *io_result)=0;
+  virtual ulong *fetch_lengths(FEDERATEDX_IO_RESULT *io_result)=0;
+  virtual const char *get_column_data(FEDERATEDX_IO_ROW *row,
+                                      unsigned int column)=0;
+  virtual bool is_column_null(const FEDERATEDX_IO_ROW *row,
+                              unsigned int column) const=0;
+};
+
+
+class federatedx_txn
+{
+  federatedx_io *txn_list;
+  ulong savepoint_level;
+  ulong savepoint_stmt;
+  ulong savepoint_next;
+  
+  void release_scan();
+public:
+  federatedx_txn();
+  ~federatedx_txn();
+  
+  bool has_connections() const { return txn_list != NULL; }
+  bool in_transaction() const { return savepoint_next != 0; }
+  int acquire(FEDERATEDX_SHARE *share, bool readonly, federatedx_io **io);
+  void release(federatedx_io **io);
+  void close(FEDERATEDX_SERVER *);
+
+  bool txn_begin();
+  int txn_commit();
+  int txn_rollback();
+
+  bool sp_acquire(ulong *save);
+  int sp_rollback(ulong *save);
+  int sp_release(ulong *save);
+
+  bool stmt_begin();
+  int stmt_commit();
+  int stmt_rollback();
+  void stmt_autocommit();
+};
+
+
+/*
+  Class definition for the storage engine
+*/
+class ha_federatedx: public handler
+{
+  friend int federatedx_db_init(void *p);
+
+  THR_LOCK_DATA lock;      /* MySQL lock */
+  FEDERATEDX_SHARE *share;    /* Shared lock info */
+  federatedx_txn *txn;
+  federatedx_io *io;
+  FEDERATEDX_IO_RESULT *stored_result;
+  uint fetch_num; // stores the fetch num
+  FEDERATEDX_IO_OFFSET current_position;  // Current position used by ::position()
+  int remote_error_number;
+  char remote_error_buf[FEDERATEDX_QUERY_BUFFER_SIZE];
+  bool ignore_duplicates, replace_duplicates;
+  bool insert_dup_update;
+  DYNAMIC_STRING bulk_insert;
+
+private:
+  /*
+      return 0 on success
+      return errorcode otherwise
+  */
+  uint convert_row_to_internal_format(uchar *buf, FEDERATEDX_IO_ROW *row,
+                                      FEDERATEDX_IO_RESULT *result);
+  bool create_where_from_key(String *to, KEY *key_info, 
+                             const key_range *start_key,
+                             const key_range *end_key,
+                             bool records_in_range, bool eq_range);
+  int stash_remote_error();
+
+  federatedx_txn *get_txn(THD *thd, bool no_create= FALSE);
+
+  static int disconnect(handlerton *hton, MYSQL_THD thd);
+  static int savepoint_set(handlerton *hton, MYSQL_THD thd, void *sv);
+  static int savepoint_rollback(handlerton *hton, MYSQL_THD thd, void *sv);
+  static int savepoint_release(handlerton *hton, MYSQL_THD thd, void *sv);
+  static int commit(handlerton *hton, MYSQL_THD thd, bool all);
+  static int rollback(handlerton *hton, MYSQL_THD thd, bool all);
+
+  bool append_stmt_insert(String *query);
+
+  int read_next(uchar *buf, FEDERATEDX_IO_RESULT *result);
+  int index_read_idx_with_result_set(uchar *buf, uint index,
+                                     const uchar *key,
+                                     uint key_len,
+                                     ha_rkey_function find_flag,
+                                     FEDERATEDX_IO_RESULT **result);
+  int real_query(const char *query, uint length);
+  int real_connect(FEDERATEDX_SHARE *my_share, uint create_flag);
+public:
+  ha_federatedx(handlerton *hton, TABLE_SHARE *table_arg);
+  ~ha_federatedx() {}
+  /* The name that will be used for display purposes */
+  const char *table_type() const { return "FEDERATED"; }
+  /*
+    The name of the index type that will be used for display
+    don't implement this method unless you really have indexes
+   */
+  // perhaps get index type
+  const char *index_type(uint inx) { return "REMOTE"; }
+  const char **bas_ext() const;
+  /*
+    This is a list of flags that says what the storage engine
+    implements. The current table flags are documented in
+    handler.h
+  */
+  ulonglong table_flags() const
+  {
+    /* fix server to be able to get remote server table flags */
+    return (HA_PRIMARY_KEY_IN_READ_INDEX | HA_FILE_BASED
+            | HA_REC_NOT_IN_SEQ | HA_AUTO_PART_KEY | HA_CAN_INDEX_BLOBS |
+            HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
+            HA_NO_PREFIX_CHAR_KEYS | HA_PRIMARY_KEY_REQUIRED_FOR_DELETE |
+            HA_PARTIAL_COLUMN_READ | HA_NULL_IN_KEY);
+  }
+  /*
+    This is a bitmap of flags that says how the storage engine
+    implements indexes. The current index flags are documented in
+    handler.h. If you do not implement indexes, just return zero
+    here.
+
+    part is the key part to check. First key part is 0
+    If all_parts it's set, MySQL want to know the flags for the combined
+    index up to and including 'part'.
+  */
+    /* fix server to be able to get remote server index flags */
+  ulong index_flags(uint inx, uint part, bool all_parts) const
+  {
+    return (HA_READ_NEXT | HA_READ_RANGE | HA_READ_AFTER_KEY);
+  }
+  uint max_supported_record_length() const { return HA_MAX_REC_LENGTH; }
+  uint max_supported_keys()          const { return MAX_KEY; }
+  uint max_supported_key_parts()     const { return MAX_REF_PARTS; }
+  uint max_supported_key_length()    const { return FEDERATEDX_MAX_KEY_LENGTH; }
+  uint max_supported_key_part_length() const { return FEDERATEDX_MAX_KEY_LENGTH; }
+  /*
+    Called in test_quick_select to determine if indexes should be used.
+    Normally, we need to know number of blocks . For federatedx we need to
+    know number of blocks on remote side, and number of packets and blocks
+    on the network side (?)
+    Talk to Kostja about this - how to get the
+    number of rows * ...
+    disk scan time on other side (block size, size of the row) + network time ...
+    The reason for "records * 1000" is that such a large number forces 
+    this to use indexes "
+  */
+  double scan_time()
+  {
+    DBUG_PRINT("info", ("records %lu", (ulong) stats.records));
+    return (double)(stats.records*1000); 
+  }
+  /*
+    The next method will never be called if you do not implement indexes.
+  */
+  double read_time(uint index, uint ranges, ha_rows rows) 
+  {
+    /*
+      Per Brian, this number is bugus, but this method must be implemented,
+      and at a later date, he intends to document this issue for handler code
+    */
+    return (double) rows /  20.0+1;
+  }
+
+  const key_map *keys_to_use_for_scanning() { return &key_map_full; }
+  /*
+    Everything below are methods that we implment in ha_federatedx.cc.
+
+    Most of these methods are not obligatory, skip them and
+    MySQL will treat them as not implemented
+  */
+  int open(const char *name, int mode, uint test_if_locked);    // required
+  int close(void);                                              // required
+
+  void start_bulk_insert(ha_rows rows);
+  int end_bulk_insert(bool abort);
+  int write_row(uchar *buf);
+  int update_row(const uchar *old_data, uchar *new_data);
+  int delete_row(const uchar *buf);
+  int index_init(uint keynr, bool sorted);
+  ha_rows estimate_rows_upper_bound();
+  int index_read(uchar *buf, const uchar *key,
+                 uint key_len, enum ha_rkey_function find_flag);
+  int index_read_idx(uchar *buf, uint idx, const uchar *key,
+                     uint key_len, enum ha_rkey_function find_flag);
+  int index_next(uchar *buf);
+  int index_end();
+  int read_range_first(const key_range *start_key,
+                               const key_range *end_key,
+                               bool eq_range, bool sorted);
+  int read_range_next();
+  /*
+    unlike index_init(), rnd_init() can be called two times
+    without rnd_end() in between (it only makes sense if scan=1).
+    then the second call should prepare for the new table scan
+    (e.g if rnd_init allocates the cursor, second call should
+    position it to the start of the table, no need to deallocate
+    and allocate it again
+  */
+  int rnd_init(bool scan);                                      //required
+  int rnd_end();
+  int rnd_next(uchar *buf);                                      //required
+  int rnd_pos(uchar *buf, uchar *pos);                            //required
+  void position(const uchar *record);                            //required
+  int info(uint);                                              //required
+  int extra(ha_extra_function operation);
+
+  void update_auto_increment(void);
+  int repair(THD* thd, HA_CHECK_OPT* check_opt);
+  int optimize(THD* thd, HA_CHECK_OPT* check_opt);
+
+  int delete_all_rows(void);
+  int create(const char *name, TABLE *form,
+             HA_CREATE_INFO *create_info);                      //required
+  ha_rows records_in_range(uint inx, key_range *start_key,
+                                   key_range *end_key);
+  uint8 table_cache_type() { return HA_CACHE_TBL_NOCACHE; }
+
+  THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
+                             enum thr_lock_type lock_type);     //required
+  bool get_error_message(int error, String *buf);
+  int start_stmt(THD *thd, thr_lock_type lock_type);
+  int external_lock(THD *thd, int lock_type);
+  int reset(void);
+  int free_result(void);
+};
+
+extern const char ident_quote_char;              // Character for quoting
+                                                 // identifiers
+extern const char value_quote_char;              // Character for quoting
+                                                 // literals
+
+extern bool append_ident(String *string, const char *name, uint length,
+                         const char quote_char);
+
+
+extern federatedx_io *instantiate_io_mysql(MEM_ROOT *server_root,
+                                           FEDERATEDX_SERVER *server);
+extern federatedx_io *instantiate_io_null(MEM_ROOT *server_root,
+                                          FEDERATEDX_SERVER *server);

storage/federatedx/plug.in

+MYSQL_STORAGE_ENGINE(federated,,[FederatedX Storage Engine],
+        [FederatedX Storage Engine], [max,max-no-ndb])
+MYSQL_PLUGIN_DYNAMIC(federated,   [ha_federatedx.la])
+MYSQL_PLUGIN_STATIC(federated,    [libfederatedx.a])
+MYSQL_PLUGIN_DEPENDS_ON_MYSQL_INTERNALS(federated, [ha_federatedx.cc])

storage/pbxt/src/cache_xt.cc

@@ -374,7 +374,7 @@ xtPublic void xt_ind_release_handle(XTIndHandlePtr handle, xtBool have_lock, XTT
 {
 	DcHandleSlotPtr	hs;
 	XTIndBlockPtr	block = NULL;
-	u_int		hash_idx = NULL;
+	u_int		hash_idx = 0;
 	DcSegmentPtr	seg = NULL;
 	XTIndBlockPtr	xblock;
 
@@ -1379,7 +1379,7 @@ xtPublic xtBool xt_ind_fetch(XTOpenTablePtr ot, XTIndexPtr ind, xtIndexNodeID ad
 	ASSERT_NS(iref->ir_xlock == 2);
 #endif
 	if (!(block = ind_cac_fetch(ot, ind, address, &seg, TRUE)))
-		return NULL;
+		return 0;
 
 	branch_size = XT_GET_DISK_2(((XTIdxBranchDPtr) block->cb_data)->tb_size_2);
 	if (XT_GET_INDEX_BLOCK_LEN(branch_size) < 2 || XT_GET_INDEX_BLOCK_LEN(branch_size) > XT_INDEX_PAGE_SIZE) {

storage/xtradb/include/buf0buf.ic

@@ -1056,7 +1056,7 @@ buf_page_release(
 	buf_block_t*	block,		/* in: buffer block */
 	ulint		rw_latch,	/* in: RW_S_LATCH, RW_X_LATCH,
 					RW_NO_LATCH */
-	mtr_t*		mtr)		/* in: mtr */
+	mtr_t*		mtr __attribute__((unused)))		/* in: mtr */
 {
 	ut_ad(block);